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:
th flow and isolation in each inlet assuming one single active 6.4-15 DRAFT Rev. 3 - April 1996 component-failure (see Appendix A for information on the damper repair alternative). The location of the intakes with respect to the plant security fence should also be reviewed. Evaluation of the design options described above depends on the physical characteristics of the site as well as the plant design and, thus, can be finalized only at the COL stage of review.74 (5) Bottled air supply for a limited time. In some plant designs the containment pressure is reduced below atmospheric within 1 hour after a DBA. This generally assuresensures that after 1 hour significant radioactive material will not be released from the containment. Such a design makes it feasible to maintain the control room above atmospheric pressure by use of bottled air. Periodic pressurization tests are required to determine that the rated flow, normally about 150 to 300 L/s (300 to 600 cfm), is sufficient to pressurize the control room to at least 3.2-mm 75 (1/8-in) water gauge. The system is also required to be composed of 76 several separate circuits, one of which is assumed to be inoperative to account for a possible single failure. At least one nonredundant, once through filter system for pressurization as a standby for accidents of long duration should be provided. Compressed air bottles should be protected from tornado missiles or internally generated missiles and should be placed so as not to cause damage to vital equipment or interference with operation if they fail. 4. Atmosphere Filtration Systems ETSBSPLB evaluates the iodine removal efficiency of the atmosphere filtration 77 systems under SRP Section 6.5.1 and determines the appropriate credit to be given and advises the AEB reviewer. The SPLB review should also include evaluation of the 78 testing proposed for the filtration system and should use applicable positions of Regulatory Guide 1.52 for guidance.79 5. Relative Location of