Document: NUREG-0800
Document ID: 9f13abda-ee55-4fa1-8276-db55ac2094ef
Document Type: srp
Title: CONTROL ROOM HABITABILITY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070449.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.4
CFR Part: 
CFR Title: 

Content:
m personnel (at least 5 individuals) should be on hand. A 6-hour onsite bottled air supply should be available with unlimited offsite replenishment capability from nearby location(s). As an example of appropriate limits, the following are the three levels for chlorine gas: protective action: 15 ppm by volume short-term: 4 ppm by volume long-term: 1 ppm by volume Regulatory Guide 1.78 provides a partial list for protective action levels for other toxic gases. Technical Rationale39 The technical rationale for application of these acceptance criteria is discussed in the following paragraphs:40 1. Compliance with GDC 4 requires that structures, systems, and components important to safety be designed to accommodate the effects of, and be compatible with, environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents (LOCAs). These structures, systems, and components shall be appropriately protected against dynamic effects (e.g., the effects of DRAFT Rev. 3 - April 1996 6.4-8 missiles, pipe whipping, and discharging fluids) that may result from equipment failures or from events and conditions outside the nuclear power unit. The function of the control room habitability system is to provide a suitable and controlled environment for the control room and equipment located therein during normal operation, anticipated operational occurrences, and during and after postulated accidents, including LOCAs. GDC 4 applies to this SRP section because the reviewer verifies that the control room will remain functional throughout the course of operating and accident events and that operators will be able to carry out their responsibilities without being subject to undue stress. Meeting the requirements of GDC 4 provides assurance that the control room habitability system will function as designed, thereby providing protection to plant operators against the effects of accidental releases of toxic and