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:
y ETSB under SRP Section 6.5.1. The ETSB will determine the credit for iodineIodine removal for this system should be in accordance with the guidelines of Regulatory Guide 1.52 and will advise the AEB accordingly. Efficiencies for systems not covered by Regulatory Guide 1.52 will be determined on a case-by-case basis by ETSB. For new applications, the system should 29 also conform with ASME Code AG-1, "Code on Nuclear Air and Gas Treatment" including the AG-1a-92 Addenda (Reference 14). Protection of control room personnel 30 from releases of chlorine or other toxic gases is addressed in Regulatory Guides 1.78 and 1.95 as discussed in the criteria below.31 5. Relative Location of Source and Control Room The control room inlets should be located considering the potential release points of radioactive material and toxic gases. Specific criteria as to radiation and toxic gas sources are as follows: a. Radiation sources. As a general rule the control room ventilation inlets should be separated from the major potential release points by at least 31 meters (100 feet)32 laterally and by 16 meters (50 feet) vertically. However, the actual minimum 33 distances must be based on the dose analyses (Ref. 9). b. Toxic gases. The minimum distance between the toxic gas source and the control room is dependent upon the amount and type of the gas in question, the container Credit for the beta radiation shielding afforded by special protective clothing and eye * protection is allowed if the applicant commits to their use during severe radiation releases. However, even though protective clothing is used, the calculated unprotected skin dose is not to exceed 750 mSv (75 rem). The skin and thyroid dose levels are to be used only for judging the 37 acceptability of the design provisions for protecting control room operators under postulated design basis accident conditions. They are not to be interpreted as accept able emergency doses. The dose levels quoted here are derived for use in