Document: NUREG-0800
Document ID: 8c2fce42-281a-4a50-9de7-513df024f27c
Document Type: srp
Title: CONTROL ROOM HABITABILITY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340712.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.4
CFR Part: 
CFR Title: 

Content:
rete. In most cases the radiation from external DBA radiation sources is attenuated to negligible levels. However, the following items should be considered qualitatively in assessing the ade- quacy of control room radiation shielding and should be coordinated with the RAB who will be requested to provide assistance as necessary. a. Control room structure boundary. Wall, ceiling, and floor materials and thickness should be reviewed. Eighteen inches to two feet of concrete or its equivalent will be adequate in most cases. b. Radiation streaming. The control room structure boundary should be reviewed with respect to penetrations (e.g., doors, ducts, stairways). The potential for radiation streaming from accident sources should be identified, and if deemed necessary, quantitatively evaluated. c. Radiation shielding from internal sources. If sources internal to the control room complex are identified, protective measures against them should be reviewed. Typical sources in this category include contaminated filter trains, or airborne radioactivity in enclosures adjacent to the control room. 6.4-13 Rev. 2 - July 1981 Evaluations of radiation shielding effectiveness with respect to the above items should be performed using si plified analytical models for point, line, or volume sources such as those presented in References 11 and 12. If more extended analysis is required, analytical support from the RAB should be requested. The applicant's coverage of the above items should also be reviewed in terms of completeness, method of analysis, and assumptions. 7. Independent Analyses The applicant is required to calculate doses to the control room opera- tors. Independent analyses are made by the AEB because of the diversity of control room habitability system designs and the engineering judgment involved in their evaluation. Using the approach indicated in Reference 6, the source terms and doses due to a DBA are calculated. The source terms determined by the AEB's independent