Document: NUREG-0800
Document ID: e1fb2732-c7c9-4bbf-99dc-ee2469f9ed6f
Document Type: srp
Title: - 12.4  RADIATION PROTECTION DESIGN FEATURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070617.pdf
Revision Date: 2023-06
Chapter: 12
Section ID: 12.3
CFR Part: 
CFR Title: 

Content:
erience and on predictions being made for new plant designs, it is expected that the plant shielding can be designed, the plant can be zoned, and sufficient radiation protection design features can be incorporated, such that individuals in shielded areas would receive a small fraction of the 10 CFR Part 20 limit. Using the methods listed in Section II.B.2 of NUREG-071810 CFR Part 50, §50.34(f)(2)(vii),58 applicants for CPs shall: (1) perform radiation and shielding design reviews of spaces around systems that may contain highly radioactive fluids and (2) implement plant designs or design modifications necessary to permit adequate access to vital areas. Applicants shall, to the extent possible, provide preliminary design information at a level consistent with that normally required at the construction permit stage of review. Using the methods listed in Section II.B.2 of NUREG-073710 CFR Part 50, §50.34(f)(2)(vii),59 applicants for standard design certifications, COL, or OLs shall: (1) perform a radiation and 60 shielding design review that identifies the location of vital areas in which personnel occupancy may be unduly limited by radiation during operations following an accident resulting in a degraded core, and (2) provide a description of the types of corrective actions needed to assure adequate access to vital areas. 2. SHIELDING The shielding design is evaluated as to the assumptions used to calculate shield thickness, the calculational methods used, and the parameters chosen. There are a number of acceptable shielding calculational codes available for use that are effective for determining the necessary shield thickness for gamma ray sources and for combination neutron-gamma sources. Most of the codes used by shield designers have been entered into the code description file of the Radiation Shielding Information Center at Oak Ridge National Laboratory, which means that they have been tested and authenticated for operation but not for reliability and accuracy.