Document: NUREG-0800
Document ID: b8e8a93f-5bc3-4f5b-9d72-fdf90a3c2e45
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF CONTROL ROD DROP ACCIDENT (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350427.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.9
CFR Part: 
CFR Title: 

Content:
eakage from the turbine and condensers. 11. Of those iodines which reach the turbine and condensers, 90% are removed by partitioning and plateout in the turbine and condensers leaving 10% airborne and available for leakage. 12. The turbine and condensers leak to the atmosphere at a rate of 1% per day for a period of 24 hours, at which time the leakage is assumed to terminate. Condenser leakage rates lower than 1% per day and shorter in duration than 24 hours will be reviewed on a case-by-case basis. Credit for condenser vacuum discharge isolation on high activity level in the steam, or credit for filtration of the condenser vacuum discharge, will also be reviewed on a case-by-case basis. 13. The effects of radiological decay during holdup in the turbine and condensers are taken into account. 14. The atmospheric dispersion factors (X/Q values), breathing rates, and dose conversion factors are the same as those used in the calculation of doses from a loss-of-coolant accident (Ref. 3). The above assumptions are used in conjunction with a branch-approved computer code such as TACT to compute the radiological consequences. The whole-body and thyroid doses presented by the applicant in the SAR and those calculated independently by the staff are compared with the acceptance criteria in subsection II. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided by the applicant and that the applicant's analysis and the staff's independent 15.4.9-7' Rev. 2 - July 1981 evaluation support conclusions of the following type, to be included in the AEB staff's safety evaluation report: Where the radiological consequences have not been specifically calculated, the findings may be in the following form: The staff concludes that the distances to the exclusion area and to the low population zone boundaries for the (INSERT.PLANT NAME) site, in conjunction with the operation of the dose mitigating ESF systems, are sufficient to provide reasonable assurance