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:
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 Source and Control Room The SABECGB will identify all potential sources of toxic or otherwise potentially 80 hazardous gases as described in SRP Section 2.22.2.1-2.2.2. The SABECGB will 81 82 provide to the AEBSPLB the findings of its toxic gas estimates for use in the control 83 room habitability analysis. There are three basic categories: Radioactive sources, toxic gases such as chlorine, and gases with the potential for being released inside confined areas adjacent to the control room. Evaluation of the relative locations of sources and airborne transport of toxic or otherwise potentially hazardous gases depends on the physical and meteorological characteristics of the site, and plant design and, thus, can be finalized only at the COL stage of review.84 a. Radiation Sources DRAFT Rev. 3 - April 1996 6.4-16 The LOCA source terms determined from the AEBPERB review in accordance 85 with Appendix A to SRP Section 15.6.5, Appendix A, are routinely used to 86 evaluate radiation levels external to the control room. The dispersal from the containment or the standby gas treatment vent is determined with a building wake diffusion model. This model is discussed in Reference 9. Contamination pathways internal to the plant are examined to determine their impact on control room habitability. Other DBAs are reviewed to determine whether they might constitute a more severe hazard than the LOCA. If appropriate, an additional analysis is performed for the suspect DBAs. b. Toxic Gases The SABECGB will review and identify those toxic substances stored or 87 transported in the vicinity of the site which may pose a threat to the plant operators upon a postulated accidental release. The method used to determine whether the quantity or location of the toxic material is such as to require