Withdrawal of Regulatory Guides 1.3, 1.4, and 1.5

The U.S. Nuclear Regulatory Commission (NRC) is withdrawing three regulatory guides (RGs): RG 1.3, Revision 2, ``Assumptions Used for Evaluating the Potential Radiological Consequences of a Loss of Coolant Accident for Boiling Water Reactors,'' dated June 1974; RG 1.4, Revision 2, ``Assumptions Used for Evaluating the Potential Radiological Consequences of a Loss of Coolant Accident for Pressurized Water Reactors,'' dated June 1974; and RG 1.5 (Safety Guide 5), ``Assumptions Used for Evaluating the Potential Radiological Consequences of a Steam Line Break Accident for Boiling Water Reactors,'' dated March 1971. These three RGs are being withdrawn because the guidance contained in them has been superseded and is now incorporated into RG 1.183, ``Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors,'' and RG 1.195, ``Methods and Assumptions for Evaluating Radiological Consequences of Design Basis Accidents at Light-Water Nuclear Power Reactors.''