Document: NUREG-0800
Document ID: 0c942a2c-afa6-4bbd-8f3f-4eede9dc146e
Document Type: srp
Title: - 12.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350048.pdf
Revision Date: 2023-06
Chapter: 12
Section ID: 12.3
CFR Part: 
CFR Title: 

Content:
lethal radiation fields are possible during fuel transfer. If removable shielding is used for the fuel transfer tubes, it must also be explicitly marked as above. If other than permanent shielding is used, local audible and visible alarming radiation monitors must be installed to alert personnel if temporary fuel transfer tube shielding is removed during fuel transfer operations. Similar precautions shall also apply to any other plant radiation source having radiation levels greater than l 100 rads per hour. The areas inside the plant structures, as well as in the general plant yard, should be subdivided into radiation zones, with identified maximum design dose rate zones and the criteria used in selecting maximum dose rates. Maximum zone dose rate should be defined for each zone, depending on anticipated occupancy and access control. Acceptance criteria are as follows: The areas that have to be occupied on a predictable basis ( based on the number of people and stay or transit times) during normal operations and anticipated operational occurrences (including refueling; purging; fuel handling and storage; radioactive material handling; processing, use, storage and disposal; normal maintenance; routine operational surveillance; inservice inspection; and calibration) should be zoned such that this occupancy results in an annual dose to each of the involved individuals that is as far below the limits of 10 CFR Part 20 as is reasonably achievable, and a total-person-rem dose that is as low as is reasonably achievable. Based on current operating experience 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. I 12.3-7 Rev. 2 - July 1981 Using the methods listed in Section II.B.2 of NUREG-0718, applicants for CPs shall: