Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
adiation and radioactive materials. safe shutdown: For fire events, those plant conditions specified in the plant technical specifications as hot standby, hot shutdown, or cold shutdown. safe-shutdown analysis: A process or method of identifying and evaluating the capability of SSCs necessary to accomplish and maintain safe-shutdown conditions in the event of a fire. safe-shutdown system or safe-shutdown equipment: Systems and equipment that perform functions needed to achieve and maintain safe shutdown (regardless of whether the system or equipment is part of the success path for safe shutdown). safety-related systems and components: Systems and components required to mitigate the consequences of postulated design-basis accidents. secondary containment: The combination of physical boundaries and ventilation systems designed to limit the release of radioactive material. short circuit: An abnormal connection (including an arc) of relatively low impedance, whether made accidentally or intentionally, between two points of different potential. short-to-ground: A short circuit between a conductor and a grounded reference point (e.g., grounded conductor, conduit or other raceway, metal enclosure, shield wrap, or drain wire within a cable). spurious actuation: The undesired operation of equipment, considering all possible functional states, resulting from a fire that could affect the capability to achieve and maintain safe shutdown. standards (code) of record: The specific editions of the nationally recognized codes and standards accepted by the NRC that constitute the licensing and design basis for the plant. success path: The minimum set of structures, systems (including power, instrument, and control circuits and instrument-sensing lines), and components that must remain free of fire damage to achieve and maintain safe shutdown in the event of a fire. “Success path” is synonymous with the safe-shutdown “train free of fire damage” and includes electrical circuits