Document: NRC Regulatory Guide
Document ID: de79d411-4fc9-456e-a5a0-f4a910ca4c9a
Document Type: regulatory_guide
Title: Assumptions Used for Evaluating a Control Rod Ejection Accident for Pressurized Water Reactors (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2111/ML21119A157.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.77
CFR Part: 
CFR Title: 

Content:
ation,” Subpart H, “Respiratory Protection and Controls to Restrict Internal Exposure in Restricted Areas” (Ref. 4) establishes requirements to mitigate the intake of chemicals and radionuclides during routine or emergency operations. For example, Part 20, Subpart H and Appendix A contain safety requirements that are applicable to applicants and licensees in the evaluation of controlled chemical release to the CR. Related Guidance • RG 1.91, “Evaluations of Explosions Postulated To Occur on Transportation Routes Near Nuclear Power Plants,” (Ref. 5), describes methods for determining the risk of damage caused by an explosion (including from liquids, cryogenically liquefied hydrocarbons, vapor clouds, etc.) at a nearby facility or on a transportation route. DG-1387, Page 3 • RG 1.174, “An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis,” (Ref. 6), describes an approach and guidance on analyzing the risk from proposed changes in plant design and operation. • RG 1.189, “Fire Protection for Nuclear Power Plants,” (Ref. 7), describes an approach and the associated requirements to manage a NPP’s fire protection program. • RG 1.200, “An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities,” (Ref. 8), describes an approach acceptable for determining whether a base probabilistic risk assessment (PRA), in total or in the portions that are used to support an application, is sufficient to provide confidence in the results. such that the PRA can be used in regulatory decision making for light-water reactors. Purpose of Regulatory Guides The NRC issues RGs to describe methods that are acceptable to the staff for implementing specific parts of the agency’s regulations, to explain techniques that the staff uses in evaluating specific issues or postulated events, and to describe information that will assist the