Document: NUREG-0800
Document ID: 1c401e6c-8c2d-47df-b05f-2978939cbd15
Document Type: srp
Title: CONTROL ROOM HABITABILITY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550069.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.4
CFR Part: 
CFR Title: 

Content:
consists of contributions from airborne radioactivity inside and outside the control room, as well as direct shine from all radiation sources. i. For current operating reactors the dose guidelines for evaluating the emergency zone radiation protection provisions are as follows: whole body gamma: 50 mSv (5 rem) thyroid: 300 mSv (30 rem) beta skin dose: 300 mSv (30 rem)1 (2) Credit for the beta radiation shielding afforded by special protective clothing and eye protection is acceptable if the applicant commits to its use during severe radiation releases. However, even though protective clothing is used, the calculated unprotected skin dose should not exceed 750 mSv (75 rem). The skin and thyroid dose levels are to be used only for judging the acceptability of the design provisions for protecting control room operators under postulated design basis accident conditions. They are not to be interpreted as acceptable emergency doses. The dose levels quoted here are derived for use in the controlled plant environment and should not be confused with the conservative dose computation assumptions used in evaluating exposures to the general public for the purposes of comparison with the values of 10 CFR Part 100. 6.4-7 Revision 3 - March 2007 ii. For current operating reactors conforming to and implementing the guidance of RG 1.195 in conjunction with RG 1.196, the dose guidelines for evaluating the emergency zone radiation protection provisions are relaxed as follows: whole body gamma: 50 mSv (5 rem) thyroid: 500 mSv (50 rem)2 beta skin dose: 500 mSv (50 rem)1, 2 B. Applicants for and holders of construction permits and operating licenses under 10 CFR Part 50 who apply on or after January 10, 1997, applicants for design certifications under 10 CFR Part 52 who apply on or after January 10, 1997, applicants for and holders of combined licenses under 10 CFR Part 52 who do not reference a standard design certification, or holders of operating licenses using an alternative source