Document: NRC Regulatory Guide
Document ID: 151ab883-1221-4a79-88d6-a2631cce2239
Document Type: regulatory_guide
Title: Decommissioning of Nuclear Power Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2134/ML21347A080.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.184
CFR Part: 
CFR Title: 

Content:
decommissioning activities. According to 10 CFR 50.71(e)(4), nuclear power facilities that have submitted certifications for permanent cessation of operations and removal of fuel must file subsequent revisions that update the FSAR and its associated licensing basis with the NRC at least every 24 months. Specific sections of the FSAR that the licensee should continue to update periodically during decommissioning include those described below. 8.4.1 Facility Description The licensee must describe, primarily in the PSDAR, the facility’s status at the time the facility is shut down and before any decommissioning or dismantlement activities occur and make the accompanying changes to the FSAR. The licensee should update only the descriptions of those facility SSCs that are included in the technical specifications or that directly affect the safe storage of irradiated fuel. However, during decommissioning, general updates to the FSAR to reflect the current condition of SSCs that were in the operating plant version of the FSAR are needed to maintain an overall understanding of the configuration basis of the plant. The updates should identify changes as systems are decontaminated, inactivated, mothballed for later use, or reconfigured to support changes to their previous functions. Even though SSCs may no longer have a safety function, documenting the status or design function of these SSCs while the plant is in a decommissioning phase has an overall safety benefit. For example, a cooling water system may no longer be required to provide a safety-related heat sink. However, if the system continues to be functional, operation of a wrong valve or a system fault or breakage, or misalignment of interfaces to this system, could result in accidents such as flooding, personnel injury, or flushing of potentially radioactive material into an uncontaminated location. As a minimum, the licensee should maintain a level of detail in the FSAR that provides the status of all the