Document: NUREG-0800
Document ID: 96cbc2a1-0072-44c5-ae86-aadfa416183c
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF MAIN STEAM LINE FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350118.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.1.5
CFR Part: 
CFR Title: 

Content:
so be claimed using models presented in Reference 7. Any iodine transferred to the secondary coolant system will become airborne at a rate which is a function of the steaming rate and iodine partition coefficient. An iodine partition coefficient of 100 between steam generator water and steam phases may be conservatively assumed, unless the applicant presents reasonable evidence that the use of some other value is justified. 8. Determination.of atmospheric dispersion characteristics (X/Q values). The appropriate X/Q values are determined by the assigned meteorologist in accordance with SRP Section 2.3.4. 9. Calculation of the exclusion area boundary (EAB) and low population zone (LPZ) boundary doses. The reviewer performs an independent calculation of the doses for the steam line break accident, using the two iodine concentrations in item 4 above; The breathing rates and dose conversion factors are in accordance with Regulatory Guide 1.4 (Ref. 8). 10. Review of dose calculations. The whole-body and thyroid doses calculated by the staff and by the applicant are compared with the acceptance criteria stated in subsection II of this appendix. If the doses calculated-by the staff are not within the exposure guidelines then the staff will reduce as necessary any of the following plant-specific technical specifications: the primary and/or secondary equilibrium iodine concentrations, maximum primary coolant iodine activity (preaccident spike), or primary-to-secondary system leak rate. 15.1.5-13 1 5Rev. 2 - July 1981 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 calcula- tions support conclusions of the following type, to be included in the staff's safety evaluation report at the operating license stage: The staff concludes that the distances to the exclusion area and to the low population zone outer boundaries for the (insert PLANT NAME) site, in