82_FR_10533 82 FR 10505 - Comprehensive Vibration Assessment Program for Reactor Internals During Preoperational and Startup Testing

82 FR 10505 - Comprehensive Vibration Assessment Program for Reactor Internals During Preoperational and Startup Testing

NUCLEAR REGULATORY COMMISSION

Federal Register Volume 82, Issue 28 (February 13, 2017)

Page Range10505-10506
FR Document2017-02864

The U.S. Nuclear Regulatory Commission (NRC) is issuing Revision 4 to Regulatory Guide (RG) 1.20, ``Comprehensive Vibration Assessment Program for Reactor Internals During Preoperational and Startup Testing.'' This RG describes methods and procedures that the NRC staff considers acceptable when developing a comprehensive vibration assessment program for reactor internals during preoperational and startup testing.

Federal Register, Volume 82 Issue 28 (Monday, February 13, 2017)
[Federal Register Volume 82, Number 28 (Monday, February 13, 2017)]
[Notices]
[Pages 10505-10506]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2017-02864]


-----------------------------------------------------------------------

NUCLEAR REGULATORY COMMISSION

[NRC-2015-0161]


Comprehensive Vibration Assessment Program for Reactor Internals 
During Preoperational and Startup Testing

AGENCY: Nuclear Regulatory Commission.

ACTION: Regulatory guide; issuance.

-----------------------------------------------------------------------

SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is issuing 
Revision 4 to Regulatory Guide (RG) 1.20, ``Comprehensive Vibration 
Assessment Program for Reactor Internals During Preoperational and 
Startup Testing.'' This RG describes methods and procedures that the 
NRC staff considers acceptable when developing a comprehensive 
vibration assessment program for reactor internals during 
preoperational and startup testing.

DATES: Revision 4 to RG 1.20 is available on February 13, 2017.

ADDRESSES: Please refer to Docket ID NRC-2015-0161 when contacting the 
NRC about the availability of information regarding this document. You 
may obtain publically-available information related to this document, 
using the following methods:
     Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2015-0161. Address 
questions about NRC dockets to Carol Gallagher; telephone: 301-415-
3463; email: [email protected]. For technical questions, contact 
the individuals listed in the FOR FURTHER INFORMATION CONTACT section 
of this document.
     NRC's Agencywide Documents Access and Management System 
(ADAMS): You may obtain publicly-available documents online in the 
ADAMS Public Document collection at http://www.nrc.gov/reading-rm/adams.html. To begin the search, select ``ADAMS Public Documents'' and 
then select ``Begin Web-based ADAMS Search.'' For problems with ADAMS, 
please contact the NRC's Public Document Room (PDR) reference staff at 
1-800-397-4209, 301-415-4737, or by email to [email protected]. The 
ADAMS accession number for each document referenced (if it is available 
in ADAMS) is provided the first time that it is mentioned in this 
document. Revision 4 to Regulatory Guide 1.20, and the regulatory 
analysis may be found in ADAMS under Accession Nos. ML16056A338 and 
ML15083A388, respectively.
     NRC's PDR: You may examine and purchase copies of public 
documents at the NRC's PDR, Room O1-F21, One White Flint North, 11555 
Rockville Pike, Rockville, Maryland 20852.
    Regulatory guides are not copyrighted, and NRC approval is not 
required to reproduce them.

FOR FURTHER INFORMATION CONTACT: Thomas Scarbrough, Office of New 
Reactors, telephone: 301-415-2794, email: [email protected]; 
Yuken Wong, Office of New Reactors, telephone: 301-415-0500, email: 
[email protected], and Stephen Burton, Office of Nuclear Regulatory 
Research, telephone: 301-15-7000, email: [email protected]. All 
are staff members of the U.S. Nuclear Regulatory Commission, 
Washington, DC 20555-0001.

SUPPLEMENTARY INFORMATION:

I. Introduction

    The NRC is issuing a revision to an existing guide in the NRC's 
``Regulatory Guide'' series. This series was developed to describe and 
make available to the public information regarding methods that are 
acceptable to the NRC staff for implementing specific parts of the 
agency's regulations, techniques that the NRC staff uses in evaluating 
specific issues or postulated events, and data that the NRC staff needs 
in its review of applications for permits and licenses.
    Revision 4 of RG 1.20 was issued with a temporary identification of 
Draft Regulatory Guide, DG-1323. This revision expands the guidance 
related to flow-induced vibration, acoustic resonance, acoustic-induced 
vibration, and mechanical-induced vibration for boiling water reactor, 
pressurized water reactor, and small modular reactor (SMR) nuclear 
power plants. For SMRs, this includes guidance for the control rod 
drive system and control rod drive mechanisms, which might be contained 
in an integral reactor vessel module. The additional guidance in 
Revision 4 is based in part on lessons learned from the review of 
recent applications, including both new plant applications and extended 
power uprate applications. In addition, Revision 4 re-

[[Page 10506]]

defines and clarifies the prototype, limited prototype, and non-
prototype classifications of reactor internal configurations.

II. Additional Information

    The DG-1323 was published in the Federal Register on July 2, 2015 
(80 FR 38239) for a 60-day public comment period. The public comment 
period closed on August 31, 2015. Public comments on DG-1323 and the 
NRC staff responses to the public comments are available in ADAMS under 
Accession No. ML16056A341.

III. Congressional Review Act

    This regulatory guide is a rule as defined in the Congressional 
Review Act (5 U.S.C. 801-808). However, the Office of Management and 
Budget has not found it to be a major rule as defined in the 
Congressional Review Act.

IV. Backfitting and Issue Finality

    Issuance of this regulatory guide does not constitute backfitting 
as defined in section 50.109 of title 10 of the Code of Federal 
Regulations (10 CFR) (the Backfit Rule), and is not otherwise 
inconsistent with the issue finality provisions in 10 CFR part 52. This 
regulatory guide does not apply to any nuclear reactor construction 
permits or operating licenses under 10 CFR part 50, design 
certifications and combined licenses under 10 CFR part 52, or license 
amendment requests for extended power uprates at operating reactors 
already issued by the NRC prior to issuance of the regulatory guide. 
The NRC has already completed its review of the comprehensive vibration 
assessment programs (CVAPs) for power reactor internals for these 
construction permits, operating licenses, design certifications, 
combined operating licenses, and license amendments for extended power 
uprates. Therefore, no further NRC regulatory action with respect to 
CVAPs will occur for those licenses, permits, certifications, and 
authorizations for which the guidance in the regulatory guide is 
relevant, absent voluntary action by the licensees to use the guidance 
to demonstrate compliance with the underlying NRC regulations. The 
regulatory guide may be applied to applications for construction 
permits, operating licenses, design certifications, combined licenses, 
and license amendments for extended power uprates, any of which are 
docketed and under review by the NRC as of the date of issuance of the 
regulatory guide. The regulatory guide may also be applied to 
applications for construction permits, operating licenses, design 
certifications, combined licenses, and license amendments for extended 
power uprates, any of which are submitted after the issuance of the 
regulatory guide. Such action would not constitute backfitting as 
defined in 10 CFR 50.109(a)(1) and is not otherwise inconsistent with 
the applicable issue finality provisions in 10 CFR part 52 because such 
applicants and potential applicants are not, with certain exceptions, 
protected by either the Backfit Rule or any issue finality provisions 
under 10 CFR part 52. This is because neither the Backfit Rule nor the 
issue finality provisions under 10 CFR part 52--with certain exclusions 
discussed below--was intended to apply to every NRC action that 
substantially changes the expectations of current and future 
applicants. The exceptions to the general principle are applicable 
whenever an applicant references a 10 CFR part 52 license (e.g., an 
early site permit), NRC regulatory approval (e.g., a design 
certification rule), or both, with specified issue finality provisions. 
The NRC does not, at this time, intend to impose the positions 
represented in the regulatory guide in a manner that is inconsistent 
with any issue finality provisions. If, in the future, the staff seeks 
to impose a position in the regulatory guide in a manner that does not 
provide issue finality as described in the applicable issue finality 
provision, then the staff must address the criteria for avoiding issue 
finality as described in the applicable issue finality provision.

    Dated at Rockville, Maryland, this 8th day of February, 2017.

    For the Nuclear Regulatory Commission.
Thomas H. Boyce,
Chief, Regulatory Guidance and Generic Issues Branch, Division of 
Engineering, Office of Nuclear Regulatory Research.
[FR Doc. 2017-02864 Filed 2-10-17; 8:45 am]
 BILLING CODE 7590-01-P



                                                                               Federal Register / Vol. 82, No. 28 / Monday, February 13, 2017 / Notices                                           10505

                                                  subject systems are in compliance with                  in ADAMS under Accession No.                          1–800–397–4209, 301–415–4737, or by
                                                  the current licensing and design bases                  ML16244A787.                                          email to pdr.resource@nrc.gov. The
                                                  and applicable regulatory requirements,                    Dated at Rockville, Maryland, this 06th day        ADAMS accession number for each
                                                  and that suitable design, operational,                  of February 2017.                                     document referenced (if it is available in
                                                  and testing control measures are in                        For the Nuclear Regulatory Commission.             ADAMS) is provided the first time that
                                                  place for maintaining this compliance;                                                                        it is mentioned in this document.
                                                                                                          Sheldon D. Stuchell,
                                                  and (2) collect the requested                                                                                 Revision 4 to Regulatory Guide 1.20,
                                                                                                          Chief, Generic Communications Branch,
                                                  information to determine whether                                                                              and the regulatory analysis may be
                                                                                                          Division of Policy and Rulemaking, Office
                                                  additional regulatory action is required.               of Nuclear Reactor Regulation.                        found in ADAMS under Accession Nos.
                                                  As a result of its review of the GL 2008–                                                                     ML16056A338 and ML15083A388,
                                                                                                          [FR Doc. 2017–02866 Filed 2–10–17; 8:45 am]
                                                  01 responses, the NRC identified that                                                                         respectively.
                                                                                                          BILLING CODE 7590–01–P
                                                  some plant-specific TS did not cover all                                                                         • NRC’s PDR: You may examine and
                                                  systems or locations susceptible to gas                                                                       purchase copies of public documents at
                                                  accumulation. Accordingly, the NRC                                                                            the NRC’s PDR, Room O1–F21, One
                                                                                                          NUCLEAR REGULATORY
                                                  staff determined that enhancements to                                                                         White Flint North, 11555 Rockville
                                                                                                          COMMISSION
                                                  TSs and the standard technical                                                                                Pike, Rockville, Maryland 20852.
                                                  specifications (STSs) were desirable.                   [NRC–2015–0161]                                          Regulatory guides are not
                                                  The nuclear industry undertook two                                                                            copyrighted, and NRC approval is not
                                                  primary initiatives to address the                      Comprehensive Vibration Assessment                    required to reproduce them.
                                                  desired regulatory guidance and TS                      Program for Reactor Internals During
                                                                                                                                                                FOR FURTHER INFORMATION CONTACT:
                                                  enhancements, NEI 09–10 and TSTF–                       Preoperational and Startup Testing
                                                                                                                                                                Thomas Scarbrough, Office of New
                                                  523. The NRC issued RIS 2013–09,                        AGENCY:  Nuclear Regulatory                           Reactors, telephone: 301–415–2794,
                                                  ‘‘NRC Endorsement of NEI 09–10,                         Commission.                                           email: Thomas.Scarbrough@nrc.gov;
                                                  Revision 1a-A, ‘Guidelines for Effective                                                                      Yuken Wong, Office of New Reactors,
                                                                                                          ACTION: Regulatory guide; issuance.
                                                  Prevention and Management of System                                                                           telephone: 301–415–0500, email:
                                                  Gas Accumulation’’’ (ADAMS                              SUMMARY:   The U.S. Nuclear Regulatory                Yuken.Wong@nrc.gov, and Stephen
                                                  Accession No. ML13178A152), to                          Commission (NRC) is issuing Revision 4                Burton, Office of Nuclear Regulatory
                                                  endorse NEI 09–10 as an acceptable and                  to Regulatory Guide (RG) 1.20,                        Research, telephone: 301–15–7000,
                                                  recommended approach for managing                       ‘‘Comprehensive Vibration Assessment                  email: Stephen.Burton@nrc.gov. All are
                                                  gas accumulation. The NRC staff                         Program for Reactor Internals During                  staff members of the U.S. Nuclear
                                                  approved for use TSTF–523, Revision 2,                  Preoperational and Startup Testing.’’                 Regulatory Commission, Washington,
                                                  in a Federal Register notice on January                 This RG describes methods and                         DC 20555–0001.
                                                  15, 2014 (79 FR 2700).                                  procedures that the NRC staff considers
                                                     Although the NRC issued plant-                                                                             SUPPLEMENTARY INFORMATION:
                                                                                                          acceptable when developing a
                                                  specific closure letters following its                  comprehensive vibration assessment                    I. Introduction
                                                  review of information submitted in                      program for reactor internals during
                                                  response to GL 2008–01, the closure                                                                              The NRC is issuing a revision to an
                                                                                                          preoperational and startup testing.                   existing guide in the NRC’s ‘‘Regulatory
                                                  letters did not address development of
                                                                                                          DATES: Revision 4 to RG 1.20 is available             Guide’’ series. This series was
                                                  additional regulatory guidance or
                                                  enhancements to both plant-specific TS                  on February 13, 2017.                                 developed to describe and make
                                                  and STS requirements. The NRC staff                     ADDRESSES: Please refer to Docket ID                  available to the public information
                                                  accepted the incorporation of a gas                     NRC–2015–0161 when contacting the                     regarding methods that are acceptable to
                                                  management program consistent with                      NRC about the availability of                         the NRC staff for implementing specific
                                                  NEI 09–10 and the adoption of TSTF–                     information regarding this document.                  parts of the agency’s regulations,
                                                  523 as approaches for plants to                         You may obtain publically-available                   techniques that the NRC staff uses in
                                                  sufficiently demonstrate the continued                  information related to this document,                 evaluating specific issues or postulated
                                                  operability of safety significant systems               using the following methods:                          events, and data that the NRC staff
                                                  susceptible to gas accumulation.                           • Federal Rulemaking Web site: Go to               needs in its review of applications for
                                                                                                          http://www.regulations.gov and search                 permits and licenses.
                                                  III. Request for Comment                                for Docket ID NRC–2015–0161. Address                     Revision 4 of RG 1.20 was issued with
                                                     This draft RIS sets forth the regulatory             questions about NRC dockets to Carol                  a temporary identification of Draft
                                                  history of the NRC’s concerns with gas                  Gallagher; telephone: 301–415–3463;                   Regulatory Guide, DG–1323. This
                                                  accumulation, as summarized above in                    email: Carol.Gallagher@nrc.gov. For                   revision expands the guidance related to
                                                  Section II, ‘‘Background.’’ This draft                  technical questions, contact the                      flow-induced vibration, acoustic
                                                  RIS, if finalized would advise affected                 individuals listed in the FOR FURTHER                 resonance, acoustic-induced vibration,
                                                  entities that those licensees who choose                INFORMATION CONTACT section of this                   and mechanical-induced vibration for
                                                  not to implement NEI 09–10 and TSTF–                    document.                                             boiling water reactor, pressurized water
                                                  523 must ensure, through some                              • NRC’s Agencywide Documents                       reactor, and small modular reactor
                                                  appropriate means, that systems remain                  Access and Management System                          (SMR) nuclear power plants. For SMRs,
                                                  operable with respect to the potential                  (ADAMS): You may obtain publicly-                     this includes guidance for the control
                                                  for accumulation of gas, in accordance                  available documents online in the                     rod drive system and control rod drive
                                                                                                          ADAMS Public Document collection at                   mechanisms, which might be contained
jstallworth on DSK7TPTVN1PROD with NOTICES




                                                  with their plant-specific TSs and their
                                                  plants’ licensing basis.                                http://www.nrc.gov/reading-rm/                        in an integral reactor vessel module.
                                                     The NRC requests public comments                     adams.html. To begin the search, select               The additional guidance in Revision 4 is
                                                  on the draft RIS. The NRC staff will                    ‘‘ADAMS Public Documents’’ and then                   based in part on lessons learned from
                                                  make a final determination regarding                    select ‘‘Begin Web-based ADAMS                        the review of recent applications,
                                                  issuance of the RIS after it considers any              Search.’’ For problems with ADAMS,                    including both new plant applications
                                                  public comments received in response                    please contact the NRC’s Public                       and extended power uprate
                                                  to this request. The draft RIS is available             Document Room (PDR) reference staff at                applications. In addition, Revision 4 re-


                                             VerDate Sep<11>2014   13:41 Feb 10, 2017   Jkt 241001   PO 00000   Frm 00056   Fmt 4703   Sfmt 4703   E:\FR\FM\13FEN1.SGM   13FEN1


                                                  10506                        Federal Register / Vol. 82, No. 28 / Monday, February 13, 2017 / Notices

                                                  defines and clarifies the prototype,                    combined licenses, and license                          Southern Nuclear Operating
                                                  limited prototype, and non-prototype                    amendments for extended power                             Company, Inc. (Vogtle Electric
                                                  classifications of reactor internal                     uprates, any of which are submitted                       Generation Plant, Units 3 and 4),
                                                  configurations.                                         after the issuance of the regulatory                      Intervenor’s Appeal of LBP–16–10
                                                                                                          guide. Such action would not constitute                   (Tentative)
                                                  II. Additional Information
                                                                                                          backfitting as defined in 10 CFR                        This meeting will be webcast live at
                                                     The DG–1323 was published in the                     50.109(a)(1) and is not otherwise
                                                  Federal Register on July 2, 2015 (80 FR                                                                       the Web address—http://www.nrc.gov/.
                                                                                                          inconsistent with the applicable issue
                                                  38239) for a 60-day public comment                      finality provisions in 10 CFR part 52                 9:00 a.m. Briefing on Lessons Learned
                                                  period. The public comment period                       because such applicants and potential                     from the Fukushima Dai-ichi
                                                  closed on August 31, 2015. Public                       applicants are not, with certain                          Accident (Public Meeting) (Contact:
                                                  comments on DG–1323 and the NRC                         exceptions, protected by either the                       Andrew Proffitt: 301–415–1418)
                                                  staff responses to the public comments                  Backfit Rule or any issue finality                      This meeting will be webcast live at
                                                  are available in ADAMS under                            provisions under 10 CFR part 52. This                 the Web address—http://www.nrc.gov/.
                                                  Accession No. ML16056A341.                              is because neither the Backfit Rule nor
                                                                                                          the issue finality provisions under 10                Friday, February 17, 2017
                                                  III. Congressional Review Act
                                                                                                          CFR part 52—with certain exclusions                   9:30 a.m. Briefing on Project Aim
                                                     This regulatory guide is a rule as                   discussed below—was intended to
                                                  defined in the Congressional Review                                                                               (Public Meeting) (Contact: Tammy
                                                                                                          apply to every NRC action that                            Bloomer: 301–415–1785)
                                                  Act (5 U.S.C. 801–808). However, the                    substantially changes the expectations
                                                  Office of Management and Budget has                     of current and future applicants. The                   This meeting will be webcast live at
                                                  not found it to be a major rule as                      exceptions to the general principle are               the Web address—http://www.nrc.gov/.
                                                  defined in the Congressional Review                     applicable whenever an applicant                      Week of February 20, 2017—Tentative
                                                  Act.                                                    references a 10 CFR part 52 license (e.g.,
                                                                                                          an early site permit), NRC regulatory                 Thursday, February 23, 2017
                                                  IV. Backfitting and Issue Finality
                                                                                                          approval (e.g., a design certification                9:30 a.m. Joint Meeting of the Federal
                                                     Issuance of this regulatory guide does
                                                                                                          rule), or both, with specified issue                      Energy Regulatory Commission and
                                                  not constitute backfitting as defined in
                                                                                                          finality provisions. The NRC does not,                    the Nuclear Regulatory Commission
                                                  section 50.109 of title 10 of the Code of
                                                                                                          at this time, intend to impose the                        (Public Meeting) (Contact: Denise
                                                  Federal Regulations (10 CFR) (the
                                                                                                          positions represented in the regulatory                   McGovern)
                                                  Backfit Rule), and is not otherwise
                                                                                                          guide in a manner that is inconsistent
                                                  inconsistent with the issue finality                                                                            This meeting will be webcast live at
                                                                                                          with any issue finality provisions. If, in
                                                  provisions in 10 CFR part 52. This                                                                            the Web address—http://www.nrc.gov/.
                                                                                                          the future, the staff seeks to impose a
                                                  regulatory guide does not apply to any
                                                                                                          position in the regulatory guide in a                 Week of February 27, 2017—Tentative
                                                  nuclear reactor construction permits or
                                                                                                          manner that does not provide issue
                                                  operating licenses under 10 CFR part 50,                finality as described in the applicable               Wednesday, March 1, 2017
                                                  design certifications and combined                      issue finality provision, then the staff
                                                  licenses under 10 CFR part 52, or                                                                             10:00 a.m. Briefing on NRC
                                                                                                          must address the criteria for avoiding                    International Activities (Closed Ex.
                                                  license amendment requests for                          issue finality as described in the
                                                  extended power uprates at operating                                                                               1 & 9)
                                                                                                          applicable issue finality provision.
                                                  reactors already issued by the NRC prior                                                                      Thursday, March 2, 2017
                                                  to issuance of the regulatory guide. The                   Dated at Rockville, Maryland, this 8th day
                                                                                                          of February, 2017.                                    9:00 a.m. Strategic Programmatic
                                                  NRC has already completed its review of
                                                  the comprehensive vibration assessment                     For the Nuclear Regulatory Commission.                 Overview of the Fuel Facilities and
                                                  programs (CVAPs) for power reactor                      Thomas H. Boyce,                                          the Nuclear Materials Users
                                                  internals for these construction permits,               Chief, Regulatory Guidance and Generic                    Business Lines (Public Meeting)
                                                  operating licenses, design certifications,              Issues Branch, Division of Engineering, Office            (Contact: Soly Soto; 301–415–7528)
                                                                                                          of Nuclear Regulatory Research.
                                                  combined operating licenses, and                                                                                This meeting will be webcast live at
                                                  license amendments for extended power                   [FR Doc. 2017–02864 Filed 2–10–17; 8:45 am]           the Web address—http://www.nrc.gov/.
                                                  uprates. Therefore, no further NRC                      BILLING CODE 7590–01–P
                                                                                                                                                                Week of March 6, 2017—Tentative
                                                  regulatory action with respect to CVAPs
                                                  will occur for those licenses, permits,                                                                         There are no meetings scheduled for
                                                  certifications, and authorizations for                  NUCLEAR REGULATORY
                                                                                                                                                                the week of March 6, 2017.
                                                  which the guidance in the regulatory                    COMMISSION
                                                  guide is relevant, absent voluntary                     [NRC–2017–0001]
                                                                                                                                                                Week of March 13, 2017—Tentative
                                                  action by the licensees to use the                                                                              There are no meetings scheduled for
                                                  guidance to demonstrate compliance                      Sunshine Act Meeting                                  the week of March 13, 2017.
                                                  with the underlying NRC regulations.
                                                                                                          DATE: February 13, 20, 27, March 6, 13,               Week of March 20, 2017—Tentative
                                                  The regulatory guide may be applied to
                                                                                                          20, 2017.
                                                  applications for construction permits,                                                                        Thursday, March 23, 2017
                                                                                                          PLACE: Commissioners’ Conference
                                                  operating licenses, design certifications,
                                                  combined licenses, and license                          Room, 11555 Rockville Pike, Rockville,                9:00 a.m. Hearing on Combined
jstallworth on DSK7TPTVN1PROD with NOTICES




                                                  amendments for extended power                           Maryland.                                                 Licenses for North Anna Nuclear
                                                  uprates, any of which are docketed and                  STATUS: Public and Closed.                                Plant, Unit 3: Section 189a. of the
                                                  under review by the NRC as of the date                                                                            Atomic Energy Act Proceeding
                                                                                                          Week of February 13, 2017
                                                  of issuance of the regulatory guide. The                                                                          (Public Meeting) (Contact: James
                                                  regulatory guide may also be applied to                 Thursday, February 16, 2017                               Shea: 301–415–1388)
                                                  applications for construction permits,                  8:55 a.m. Affirmation Session (Public                   This meeting will be webcast live at
                                                  operating licenses, design certifications,                  Meeting) (Tentative)                              the Web address—http://www.nrc.gov/.


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Document Created: 2017-02-11 00:59:13
Document Modified: 2017-02-11 00:59:13
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionNotices
ActionRegulatory guide; issuance.
DatesRevision 4 to RG 1.20 is available on February 13, 2017.
ContactThomas Scarbrough, Office of New Reactors, telephone: 301-415-2794, email: [email protected]; Yuken Wong, Office of New Reactors, telephone: 301-415-0500, email: [email protected], and Stephen Burton, Office of Nuclear Regulatory Research, telephone: 301-15-7000, email: [email protected] All are staff members of the U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001.
FR Citation82 FR 10505 

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