F, U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN OFFICE OF NUCLEAR REACTOR REGULATION 6.4 CONTROL ROOM HABITABILITY SYSTEM REVIEW RESPONSIBILITIES

The control room ventilation system and control building layout and structures, as described in the applicant's safety analysis report (SAR), are reviewed with the objective of assuring that plant operators are adequately protected agairst the effects of accidental releases of toxic and radioactive gases. A further objec-tive is to assure that the control room can be maintained as the backup center from which technical support center personnel can safely operate in the case of an accident. To assure that these objectives are accomplished the following items are reviewed: 1. The zone serviced by the control room emergency ventilation system is examined to ascertain that all critical areas requiring access in the event of an accident are included within the zone (control room, kitchen, sanitary facilities, etc.) and to assure that those areas not requiring access are generally excluded from the zone. 2. The capacity of the control room in terms of the number of people it can accommodate for an extended period of time is reviewed to confirm the ade-quacy of self-contained breathing apparatus and to determine the length of time the control room can be isolated before CO2 levels become excessive. 3. The control room ventilation system layout and functional design is reviewed to determine flow rates and filter efficiencies for input into the analyses of the buildup of radioactive or toxic gases inside the control room, assuming a design basis release. Basic deficiencies that might impair th