Document: NUREG-0800
Document ID: f9721491-7ec5-4df0-a6d4-e76111e0ff41
Document Type: srp
Title: RADIATION PROTECTION AND EMERGENCY PREPAREDNESS (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070668.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.8
CFR Part: 
CFR Title: 

Content:
ent or temporary shielding) is adequate to ensure that the maximum radiation levels in plant areas are commensurate with the area's access requirements so radiation exposures to plant personnel can be maintained as low as reasonably achievable (ALARA) during normal plant operations and maintenance. Tier 1 should ensure that adequate shielding is provided for those areas of the plant that may require occupancy to permit an operator to aid in the mitigation of or the recovery from an accident. Tier 1 should ensure that the contribution to the radiation dose from gamma shine (particularly from the turbine building) to a member of the public (off site) will be a small fraction of the EPA dose limit in 40 CFR Part 190. The criteria in Tier 1 should ensure that the plant provides adequate containment and ventilation flow rates to control the concentrations of airborne radioactivity to levels commensurate with the access requirements of areas in the plant. Tier 1 should ensure that once the concentrations of airborne radioactivity are determined, the required airborne monitors are provided in the appropriate locations in the plant. Radiological Dose Consequences The reviewer should review the ITAAC for which PERB has secondary review responsibility, focusing on verifying design features and assumptions upon which the radiological dose consequence assessment of design basis accidents (DBAs). The following discussion provides examples of some of the important design features and assumptions that should be addressed in Tier 1. The maximum MSIV closure time and maximum MSIV leakage rates may be verified by the ITAAC for the nuclear boiler system (BWR's only). The maximum primary containment leakage rate may be verified by the ITAAC for the primary containment system. The minimum radioiodine removal efficiency of the charcoal adsorbers in the standby gas treatment system (SGTS) filter trains and the maximum time for the SGTS to draw a specified negative pressure in the