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:
, or airborne radioactivity in enclosures adjacent to the control room. Evaluations of radiation shielding effectiveness with respect to the above items should be performed using simplified analytical models for point, line, or volume sources such as those presented in References 12 and 13. If more extended analysis is required, analytical support from the RABPERB should be 94 DRAFT Rev. 3 - April 1996 6.4-18 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 operators. Independent analyses are made by the AEBPERB because of the diversity of control room 95 habitability system designs and the engineering judgment involved in their evaluation. Since this analysis involves site-related characteristics, it can be finalized only at the COL stage of review. Using the approach indicated in Reference 9, the source terms 96 and doses due to a DBA are calculated. The source terms determined by the AEBPERB independent analysis of low population zone (LPZ) doses for a LOCA are 97 used. The methods and assumptions for this calculation are presented in Appendix A to SRP Section 15.6.5, Appendix A. The control room doses are determined by 98 estimating the X/Q from the source points to the emergency zone using meteorological input supplied by the assigned meteorologist, by determining the credit for the emergency zone's protection features, and by calculating the dose. The attached Table 6.4-1 is a form which may be used to summarize the information that is needed for the control room dose calculation. The effective X/Q's are used for calculating the doses. The dose is then compared with the guidelines of GDC 19. If the guideline values are exceeded, the applicant will be requested to improve the system. In the event that other DBAs are expected to result in doses comparable to or higher than the LOCA,