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:
e involved. 1. Control Room Emergency Zone The reviewer verifies that the control room emergency zone includes the areas identified in subsection II.1 of this SRP section. The emergency zone should be limited to those spaces requiring operator occupancy. Spaces such as battery rooms, cable spreading rooms, or other spaces not requiring continuous or frequent occupancy after a design basis accident (DBA) generally should be excluded from the emergency zone. 45 Inclusion of these spaces may increase the probability of smoke or hazardous gases entering the emergency zone. They may also increase the possibility of infiltration into the emergency zone, thus decreasing the effectiveness of the ventilation system in excluding contamination. It is advantageous to have the emergency zone located on one floor, with the areas included in the zone being contiguous. 2. Control Room Personnel Capacity A control room designed with complete isolation capability from the outside air to provide radiation and toxic gas protection is reviewed to determine if the buildup of carbon dioxide could present a problem. The air inside a 2830 m (100,000 cubic foot) 3 46 control room would support five persons for at least six days. Thus, CO buildup in an 2 isolated emergency zone is not normally considered a limiting problem. 3. Ventilation System Layout and Functional Design The reviewer evaluates the control room ventilation system in order to establish appropriate parameters to be used in the control room dose calculations. The review is coordinated with the ASB which evaluates the control room ventilation system design DRAFT Rev. 3 - April 1996 6.4-10 and performance is evaluated in accordance with SRP Section 9.4.1. The reviewer 47 should use Regulatory Guide 1.52 and, for new applications, ASME Code AG-1 including the AG-1a-92 Addenda to evaluate the system. The procedures are as 48 follows: a. The type of system proposed is determined. The following types of protection provisions are