80 FR 46061 - Testing of Open Secondary Window-Type Current Transformers-Test Plan
NUCLEAR REGULATORY COMMISSION Federal Register Volume 80, Issue 148 (August 3, 2015)
Federal Register Volume 80, Issue 148 (August 3, 2015)
| Page Range | 46061-46062 | |
| FR Document | 2015-18997 |
[Federal Register Volume 80, Number 148 (Monday, August 3, 2015)] [Notices] [Pages 46061-46062] From the Federal Register Online [www.thefederalregister.org] [FR Doc No: 2015-18997] ----------------------------------------------------------------------- NUCLEAR REGULATORY COMMISSION [NRC-2015-0183] Testing of Open Secondary Window-Type Current Transformers--Test Plan AGENCY: Nuclear Regulatory Commission. ACTION: Draft test plan; request for comment. ----------------------------------------------------------------------- SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is issuing for public comment a proposed draft test plan, ``Testing of Open Secondary Window-Type Current Transformers--Test Plan.'' The purpose of this testing is to better understand the following scenario: Will open circuiting of the secondary circuit of a current transformer (CT), which is operating within its rated continuous primary current limits, result in an excessively high voltage in the secondary circuit sufficient to start a fire in the form of explosion or arcing in the circuit's insulation at the location of the CT itself or at some other location in the secondary circuit? DATES: Submit comments by September 2, 2015. Comments received after this date will be considered if it is practical to do so, but the Commission is able to ensure consideration only for comments received before this date. ADDRESSES: You may submit comments by any of the following methods (unless this document describes a different method for submitting comments on a specific subject):Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2015-0183. Address questions about NRC dockets to Carol Gallagher; telephone: 301-415- 3463; email: [email protected]. For technical questions, contact the individual listed in the FOR FURTHER INFORMATION CONTACT section of this document. Mail comments to: Cindy Bladey, Office of Administration, Mail Stop: OWFN-12-H08, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001. For additional direction on obtaining information and submitting comments, see ``Obtaining Information and Submitting Comments'' in the SUPPLEMENTARY INFORMATION section of this document. FOR FURTHER INFORMATION CONTACT: Shivani Mehta, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; telephone: 301-415-0860, email: [email protected]. SUPPLEMENTARY INFORMATION: [[Page 46062]] I. Obtaining Information and Submitting Comments A. Obtaining Information Please refer to Docket ID NRC-2015-0183 when contacting the NRC about the availability of information for this action. You may obtain publicly-available information related to this action by any of the following methods: Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2015-0183. NRC's Agencywide Documents Access and Management System (ADAMS): You may obtain publicly-available documents online in the ADAMS Public Documents 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 proposed draft test plan, ``Testing of Open Secondary Window-Type Current Transformers--Test Plan'' is available in ADAMS under Accession No. ML15203A228. 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. B. Submitting Comments Please include Docket ID NRC-2015-0183 in your comment submission. The NRC cautions you not to include identifying or contact information that you do not want to be publicly disclosed in your comment submission. The NRC will post all comment submissions at http://www.regulations.gov as well as enter the comment submissions into ADAMS. The NRC does not routinely edit comment submissions to remove identifying or contact information. If you are requesting or aggregating comments from other persons for submission to the NRC, then you should inform those persons not to include identifying or contact information that they do not want to be publicly disclosed in their comment submission. Your request should state that the NRC does not routinely edit comment submissions to remove such information before making the comment submissions available to the public or entering the comment submissions into ADAMS. II. Discussion The NRC is issuing for public comment a proposed draft test plan. The purpose of this test program is to better understand and obtain information to form a technical basis for assessing the propensity of a secondary fire or damage to the secondary side circuit or components as a result of an open-circuited current transformer (CT) secondary winding. Specifically, the test program will allow investigation of the high-voltage in the secondary circuit to determine if it is sufficient to induce a fire in the circuit's insulation at the CT location or within the secondary circuit. The NRC is seeking public comment in order to receive feedback from the widest range of interested parties and to ensure that all information relevant to developing this document is available to the NRC staff. This document is issued for comment only and is not intended for interim use. The NRC will review public comments received on the documents, incorporate suggested changes as necessary, and make the final test plan available to the public through ADAMS and http://www.regulations.gov at Docket ID NRC-2015-0183, and will be documented in the final test report. No responses will be provided to specific commenters in regards to the disposition of their comments. Current transformers (CTs) are widely used to monitor the current at strategic locations of electrical power distribution systems in nuclear power plants (NPPs). The CTs provide isolation from the high- voltage primary, and step-down the magnitude of the measured current to a value that can be safely handled by the monitoring instruments. Thus, they are designed to measure the current in alternating current (AC) power systems (generally three-phase systems) in their primary winding and transform this current into a representative low secondary current for instrumentation used for remote readout of the current. An open- circuit in a CT's secondary winding can cause high voltages on the secondary circuit as the CT attempts to maintain the current relationship dictated by the transformer's winding turns ratio. The resulting high voltage condition in the secondary circuit from an open- circuited CT introduces a potential failure mode that warrants further investigation as part of the final resolution of circuit failure issues associated with the fire protection strategies at nuclear power plants. Specifically, an open circuit on a high voltage CT circuit may result in secondary damage, possibly resulting in the occurrence of an additional fire in the location of the CT itself or at a location remote to the CT. This potential event is described in Section 3.5.2.1 of the NEI 00-01, Revision 2 (ADAMS Accession No. ML091770265), and endorsed by Regulatory Guide 1.189, Revision 2 (ADAMS under Accession No. ML092580550). Accordingly, the purpose of this test program is to better understand and obtain information to form a technical basis for assessing the propensity of a secondary fire or damage to the secondary side circuit or components under an open-circuited CT secondary winding. Specifically, the test program will allow investigation of the high-voltage in the secondary circuit to determine if it is sufficient to induce a fire in the circuit's insulation at the CT location or within the secondary circuit. Dated at Rockville, Maryland, this 27th day of July 2015. For the Nuclear Regulatory Commission. Felix Gonzalez, Acting Chief, Fire Research Branch, Division of Risk Analysis, Office of Nuclear Regulatory Research. [FR Doc. 2015-18997 Filed 7-31-15; 8:45 am] BILLING CODE 7590-01-P
![Federal Register / Vol. 80, No. 148 / Monday, August 3, 2015 / Notices 46061
compatibility levels for rule of stakeholders will be beneficial. NUCLEAR REGULATORY
requirements? Further, NRC staff anticipates that COMMISSION
stakeholders will identify and provide
Applicability to General Licensees [NRC–2015–0183]
their perspectives on additional issues
The applicability of financial they identify that are relevant to Testing of Open Secondary Window-
planning requirements to licensees financial planning for management of Type Current Transformers—Test Plan
possessing generally licensed sealed disused or unwanted radioactive
sources should be considered. byproduct material. AGENCY: Nuclear Regulatory
According to the 2014 Disused Sources Based on the results of the expanded Commission.
Working Group report, there are at least byproduct material financial scoping ACTION: Draft test plan; request for
a few licensees who possess generally study, staff will compile a report with comment.
licensed sources in quantities of study results and recommendations for
concern. next steps to be provided to the SUMMARY: The U.S. Nuclear Regulatory
Question 6: When necessary, what Commission in spring 2016. Staff Commission (NRC) is issuing for public
mechanism should be used to recommendations could include options comment a proposed draft test plan,
administer financial planning such as limited rulemaking, broad scope ‘‘Testing of Open Secondary Window-
requirements on general licensees? rulemaking, advance notice of proposed Type Current Transformers—Test Plan.’’
rulemaking, development of guidance, The purpose of this testing is to better
Characteristics and Qualifications of the
issuance of a generic communication, or understand the following scenario: Will
Fund Custodian
no action. open circuiting of the secondary circuit
Another consideration in establishing of a current transformer (CT), which is
financial planning requirements is how IV. Topic-Specific Public Meeting operating within its rated continuous
to determine the proper custodian for The NRC will convene a topic-specific primary current limits, result in an
the fund that is to be earmarked for public meeting in Rockville, MD, in excessively high voltage in the
disposition. early fall 2015. The public meeting will secondary circuit sufficient to start a fire
Question 7: What are the ideal include a webinar and teleconference in the form of explosion or arcing in the
characteristics and qualifications for an for the convenience of participants who circuit’s insulation at the location of the
entity that will act as the custodian for find attendance inconvenient or CT itself or at some other location in the
any funds earmarked for long-term prohibitive. A meeting notice will be secondary circuit?
management of disused sealed sources? posted to the NRC’s public Web site at DATES: Submit comments by September
For instance, what characteristics and http://meetings.nrc.gov/pmns/mtg no 2, 2015. Comments received after this
qualifications should be taken into fewer than 10 days prior to the meeting date will be considered if it is practical
consideration regarding the custodian’s providing the date, time, and venue of to do so, but the Commission is able to
relationship to the licensee (e.g., the the meeting, as well as remote ensure consideration only for comments
ability of the custodian to access the participation instructions. A transcript received before this date.
funds, or the custodian’s independent of the public meeting will be made ADDRESSES: You may submit comments
financial viability)? In the event that publicly available in ADAMS, as well as by any of the following methods (unless
there is a residual amount remaining in posted on the Federal Rulemaking Web this document describes a different
the fund following payment of site at http://www.regulations.gov, method for submitting comments on a
disposition cost, what should be the fate under Docket ID NRC–2015–0182. The specific subject):
of the residual funds? Federal Rulemaking Web site allows • Federal Rulemaking Web site: Go to
Tracking you to receive alerts when changes or http://www.regulations.gov and search
additions occur in a docket folder. To for Docket ID NRC–2015–0183. Address
For licensees possessing Category 1 or
subscribe: (1) Navigate to the docket questions about NRC dockets to Carol
2 radioactive sealed sources, regulators
folder (NRC–2015–0182); (2) click the Gallagher; telephone: 301–415–3463;
can access the National Source Tracking
‘‘Email Alert’’ link; and (3) enter your email: Carol.Gallagher@nrc.gov. For
System (NSTS) to determine the number
email address and select how frequently technical questions, contact the
and type of licensees that would be
you would like to receive emails (daily, individual listed in the FOR FURTHER
potentially impacted by end-of-life
weekly, or monthly). INFORMATION CONTACT section of this
financial assurance requirements. For
The NRC staff will use the document.
new sources, source manufacturers or
suppliers could be contacted to
information gathered from the public • Mail comments to: Cindy Bladey,
meeting to supplement information Office of Administration, Mail Stop:
determine how they would be impacted
gathered in response to this FRN and OWFN–12–H08, U.S. Nuclear
by any new requirements. However, it
other sources to prepare a report on Regulatory Commission, Washington,
may be more difficult to implement
byproduct material financial scoping DC 20555–0001.
requirements and ensure accountability
study for the Commission, which will For additional direction on obtaining
regarding sources that are not tracked in
include the NRC staff’s information and submitting comments,
the NSTS (e.g. Category 3 and lower).
recommendations for next steps. see ‘‘Obtaining Information and
Question 8: What are the key
characteristics of a tracking system for Dated at Rockville, MD this 24th day of Submitting Comments’’ in the
July 2015. SUPPLEMENTARY INFORMATION section of
byproduct material (sealed sources)
this document.
mstockstill on DSK4VPTVN1PROD with NOTICES
subject to financial planning For the Nuclear Regulatory Commission.
requirements? Which of these Andrew Persinko, FOR FURTHER INFORMATION CONTACT:
characteristics are not available as part Deputy Director, Division of Shivani Mehta, Office of Nuclear
of the NSTS? Decommissioning, Uranium Recovery, and Regulatory Research, U.S. Nuclear
The topical areas and questions that Waste Programs, Office of Nuclear Material Regulatory Commission, Washington,
the NRC staff has identified above are Safety and Safeguards. DC 20555–0001; telephone: 301–415–
consequential, but not exhaustive. [FR Doc. 2015–18891 Filed 7–31–15; 8:45 am] 0860, email: Shivani.Mehta@nrc.gov.
Varied perspectives from a broad range BILLING CODE 7590–01–P SUPPLEMENTARY INFORMATION:
VerDate Sep<11>2014 18:35 Jul 31, 2015 Jkt 235001 PO 00000 Frm 00130 Fmt 4703 Sfmt 4703 E:\FR\FM\03AUN1.SGM 03AUN1](https://thefederalregister.org/doc/80_FR_46209/page/1.svg)
![46062 Federal Register / Vol. 80, No. 148 / Monday, August 3, 2015 / Notices
I. Obtaining Information and II. Discussion the occurrence of an additional fire in
Submitting Comments The NRC is issuing for public the location of the CT itself or at a
comment a proposed draft test plan. The location remote to the CT. This potential
A. Obtaining Information event is described in Section 3.5.2.1 of
purpose of this test program is to better
Please refer to Docket ID NRC–2015– understand and obtain information to the NEI 00–01, Revision 2 (ADAMS
0183 when contacting the NRC about form a technical basis for assessing the Accession No. ML091770265), and
the availability of information for this propensity of a secondary fire or damage endorsed by Regulatory Guide 1.189,
action. You may obtain publicly- to the secondary side circuit or Revision 2 (ADAMS under Accession
available information related to this components as a result of an open- No. ML092580550).
action by any of the following methods: circuited current transformer (CT) Accordingly, the purpose of this test
secondary winding. Specifically, the test program is to better understand and
• Federal Rulemaking Web site: Go to obtain information to form a technical
http://www.regulations.gov and search program will allow investigation of the
high-voltage in the secondary circuit to basis for assessing the propensity of a
for Docket ID NRC–2015–0183. secondary fire or damage to the
determine if it is sufficient to induce a
• NRC’s Agencywide Documents fire in the circuit’s insulation at the CT secondary side circuit or components
Access and Management System location or within the secondary circuit. under an open-circuited CT secondary
(ADAMS): You may obtain publicly- The NRC is seeking public comment winding. Specifically, the test program
available documents online in the in order to receive feedback from the will allow investigation of the high-
ADAMS Public Documents collection at widest range of interested parties and to voltage in the secondary circuit to
http://www.nrc.gov/reading-rm/ ensure that all information relevant to determine if it is sufficient to induce a
adams.html. To begin the search, select developing this document is available to fire in the circuit’s insulation at the CT
‘‘ADAMS Public Documents’’ and then the NRC staff. This document is issued location or within the secondary circuit.
select ‘‘Begin Web-based ADAMS for comment only and is not intended Dated at Rockville, Maryland, this 27th day
Search.’’ For problems with ADAMS, for interim use. The NRC will review of July 2015.
please contact the NRC’s Public public comments received on the For the Nuclear Regulatory Commission.
Document Room (PDR) reference staff at documents, incorporate suggested Felix Gonzalez,
1–800–397–4209, 301–415–4737, or by changes as necessary, and make the Acting Chief, Fire Research Branch, Division
email to pdr.resource@nrc.gov. The final test plan available to the public of Risk Analysis, Office of Nuclear Regulatory
proposed draft test plan, ‘‘Testing of through ADAMS and http:// Research.
Open Secondary Window-Type Current www.regulations.gov at Docket ID NRC– [FR Doc. 2015–18997 Filed 7–31–15; 8:45 am]
Transformers—Test Plan’’ is available in 2015–0183, and will be documented in BILLING CODE 7590–01–P
ADAMS under Accession No. the final test report. No responses will
ML15203A228. be provided to specific commenters in
• NRC’s PDR: You may examine and regards to the disposition of their NUCLEAR REGULATORY
purchase copies of public documents at comments. COMMISSION
the NRC’s PDR, Room O1–F21, One Current transformers (CTs) are widely
[Docket Nos. 50–373 and 50–374; NRC–2
White Flint North, 11555 Rockville used to monitor the current at strategic
015–0180]
Pike, Rockville, Maryland 20852. locations of electrical power
distribution systems in nuclear power Exelon Generation Company, LLC;
B. Submitting Comments plants (NPPs). The CTs provide LaSalle County Station, Units 1 and 2
Please include Docket ID NRC–2015– isolation from the high-voltage primary,
and step-down the magnitude of the AGENCY: Nuclear Regulatory
0183 in your comment submission.
measured current to a value that can be Commission.
The NRC cautions you not to include safely handled by the monitoring ACTION: Environmental assessment and
identifying or contact information that instruments. Thus, they are designed to finding of no significant impact;
you do not want to be publicly measure the current in alternating issuance.
disclosed in your comment submission. current (AC) power systems (generally
The NRC will post all comment three-phase systems) in their primary SUMMARY: The U.S. Nuclear Regulatory
submissions at http:// winding and transform this current into Commission (NRC) is considering
www.regulations.gov as well as enter the a representative low secondary current issuance of amendments to Facility
comment submissions into ADAMS. for instrumentation used for remote Operating License Nos. NPF–11 and
The NRC does not routinely edit readout of the current. An open-circuit NPF–18 issued to Exelon Generation
comment submissions to remove in a CT’s secondary winding can cause Company, LLC (Exelon, the licensee) for
identifying or contact information. high voltages on the secondary circuit as operation of LaSalle County Station
If you are requesting or aggregating the CT attempts to maintain the current (LSCS), Units 1 and 2, located in LaSalle
comments from other persons for relationship dictated by the County, Illinois. The proposed
submission to the NRC, then you should transformer’s winding turns ratio. The amendment would revise the maximum
inform those persons not to include resulting high voltage condition in the allowable technical specification (TS)
identifying or contact information that secondary circuit from an open- temperature of the ultimate heat sink for
they do not want to be publicly circuited CT introduces a potential the plant. The NRC staff is issuing a
final Environmental Assessment (EA)
mstockstill on DSK4VPTVN1PROD with NOTICES
disclosed in their comment submission. failure mode that warrants further
Your request should state that the NRC investigation as part of the final and Finding of No Significant Impact
does not routinely edit comment resolution of circuit failure issues (FONSI) associated with the proposed
submissions to remove such information associated with the fire protection license amendments.
before making the comment strategies at nuclear power plants. DATES: The environmental assessment
submissions available to the public or Specifically, an open circuit on a high and finding of no significant impact
entering the comment submissions into voltage CT circuit may result in referenced in this document is available
ADAMS. secondary damage, possibly resulting in on August 3, 2015.
VerDate Sep<11>2014 18:35 Jul 31, 2015 Jkt 235001 PO 00000 Frm 00131 Fmt 4703 Sfmt 4703 E:\FR\FM\03AUN1.SGM 03AUN1](https://thefederalregister.org/doc/80_FR_46209/page/2.svg)
Document Created: 2018-02-23 10:51:34
Document Modified: 2018-02-23 10:51:34
| Category | Regulatory Information | |
| Collection | Federal Register | |
| sudoc Class | AE 2.7: GS 4.107: AE 2.106: | |
| Publisher | Office of the Federal Register, National Archives and Records Administration | |
| Section | Notices | |
| Action | Draft test plan; request for comment. | |
| Dates | Submit comments by September 2, 2015. Comments received after this date will be considered if it is practical to do so, but the Commission is able to ensure consideration only for comments received before this date. | |
| Contact | Shivani Mehta, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; telephone: 301-415-0860, email: [email protected] | |
| FR Citation | 80 FR 46061 |
2024 Federal Register | Disclaimer | Privacy Policy
USC | CFR | eCFR