Nuclear Regulatory Commission August 21, 2023 – Federal Register Recent Federal Regulation Documents
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Regulatory Guide: Use of ARCON Methodology for Calculation of Accident-Related Offsite Atmospheric Dispersion Factors
The U.S. Nuclear Regulatory Commission (NRC) is issuing a new Regulatory Guide (RG) 1.249 (Revision 0), ``Use of ARCON Methodology for Calculation of Accident-Related Offsite Atmospheric Dispersion Factors.'' This new RG describes an approach for reactor applicants and licensees for determining atmospheric relative concentration ([chi]/Q) values in support of modeling onsite releases to offsite boundaries from a design-basis accident. Also, this RG implements the methodology in RG 1.194, ``Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants,'' for offsite dose locations at boundaries.
American Society of Mechanical Engineers 2021-2022 Code Editions
The U.S. Nuclear Regulatory Commission (NRC) is correcting the preamble of a proposed rule that was published in the Federal Register on August 8, 2023, to amend its regulations to incorporate by reference the 2021 Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code and the 2022 Edition of the American Society of Mechanical Engineers Operation and Maintenance of Nuclear Power Plants, Division 1: OM Code: Section IST, for nuclear power plants. This action is necessary to correct an editorial error to include reference to missing standards.
Regulatory Guide: Volcanic Hazards Assessment for Proposed Nuclear Power Reactor Sites
The U.S. Nuclear Regulatory Commission (NRC) is issuing Revision 1 to Regulatory Guide (RG) 4.26 ``Volcanic Hazards Assessment for Proposed Nuclear Power Reactor Sites,'' to restore text and a Section heading inadvertently omitted from Section C, ``Staff Regulatory Guidance,'' of Revision 0. The restored text appeared in the draft guide released for public comment. In addition, there is a minor update of the Paperwork Reduction Act text in the RG. The changes do not represent substantive changes in the NRC staff's regulatory positions.
Level 3 Probabilistic Risk Assessment Project Documentation (Volume 4)
The U.S. Nuclear Regulatory Commission (NRC) is issuing for public comment a draft report on the Level 3 Probabilistic Risk Assessment (PRA) project; specifically, ``Volume 4: Overview of Reactor, At-Power, Level 1, 2, and 3 PRAs for Internal Fires, Seismic Events, and High Winds.''
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