Document: NUREG-0800
Document ID: 9aa9f059-274f-4f61-8c7e-88e13eb69bd0
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070540.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
CFR Part: 
CFR Title: 

Content:
ng sufficient capacity and capability for coping with a station blackout event. An analysis to determine capability for withstanding (if an acceptable alternate ac source is provided) or coping with a station blackout event is required. The analysis should address, as appropriate, the potential failures of equipment/systems during the event (e.g., loss of or degraded operability of HVAC systems, including the CRAVS, as appropriate), the expected environmental conditions associated with the event, the operability and reliability of equipment necessary to cope with the event under the expected environmental conditions, and the habitability of plant areas requiring operator access during the event and associated recovery period. Acceptance is based on meeting the applicable guidance of Regulatory Guide 1.155, including position C.3.2.4.52 Technical Rationale53 The technical rationale for application of these acceptance criteria to reviewing the CRAVS is discussed in the following paragraphs:54 1. Compliance with GDC 2, as related to the system being capable of withstanding the effects of earthquakes, requires that structures, systems, and components important to safety be designed to withstand the effects of a design basis earthquake without loss of capability to perform their safety functions. The function of the CRAVS is to provide a controlled environment for the comfort and safety of control room personnel during normal operation, anticipated operational occurrences, and during and after postulated accidents, including the coincidental loss of offsite power. This requirement is imposed to ensure that the control room will remain functional in the event of a design basis earthquake. Regulatory Guide 1.29 provides guidance acceptable to the staff for meeting these control room occupancy protection requirements. Meeting the requirement of GDC 2 provides assurance that the habitability of the control room area will be maintained and that equipment in the control room