Document: NRC Regulatory Guide
Document ID: 8291b9eb-e4a7-4806-8b5b-1deca2ff1fe2
Document Type: regulatory_guide
Title: Control Room Habitability at Light-Water Nuclear Power Reactors
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0207/ML020790125.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.196
CFR Part: 
CFR Title: 

Content:
Guides DG-1111, "Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants" (Ref. RA- 4), and DG-1113, "Methods and Assumptions for Evaluating Radiological Consequences of Design Basis Accidents at Light-Water Nuclear Power Reactors" (Ref. RA-5), or Regulatory Guide 1.183, "Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors" (Ref. RA-6). Similarly, the staff has found other parts of NEI 99-03 to be acceptable with exceptions and clarifications. This alternative would be supportive of the four reactor safety performance goals. Issuing a regulatory guide that endorses sections of NEI 99-03 would: ! Maintain public safety by providing needed guidance on ensuring that the CRE is consistent with the plant’s licensing basis. ! Improve efficiency and effectiveness by minimizing reiterative discussions between staff and licensees to establish acceptable approaches by providing adequate formal guidance through the use of acceptable work already performed by the industry. RA-4 ! Minimize unnecessary regulatory burden by providing guidance on implementing a CRE integrity testing program that provides a basis for replacing the non-conclusive surveillance test currently used. ! Maintain public confidence by providing guidance that supports improved confidence in the ability of the control room operators to take necessary actions during an emergency condition. The staff has determined that this alternative, issuing a new regulatory guide that endorses parts of NEI 99-03, with exceptions and clarification, is the most advantageous approach to addressing the need for additional regulatory guidance on performing assessments of CRH. 3. Alternative 3 – Endorse a National Consensus Standard Although there are national consensus standards that address measurements of air exchange in buildings and flow in ventilation system components, the staff was not able to identify any