Document: NUREG-0800
Document ID: c4b10c9f-d82d-4bdd-884b-b83cba562a74
Document Type: srp
Title: Appendix A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350158.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.5
CFR Part: 
CFR Title: 

Content:
ing the secondary containment. The secondary containment bypass leakage rate and any positive pressure characteristics in thesecondary containment are obtained from SAR Section 6.2.3 which is reviewed by CSB. 15.6.5-11 Rev. 1 - July 1981 If the bypass leakage rate or secondary containment positive pressure characteristics are revised as a result of CSS review, CSB will inform AEB of the change. 4. The operation of the normal containment vent/purge system is reviewed by CSB under SRP Section 6.2.4. If the proposed system operation does not meet the CSB positions, the CSB will request the AEB to perform an analysis of the radiological consequences using this release path as an additional contributor to the total LOCA doses. 5. Credit for any engineered safety features such as atmosphere filtration systems, spray systems, or ice condenser is deterined in the review of Section 6.5 of the SAR. These features operate during the LOCA to miti- gate the consequences by reducing the amount of iodine fission products released to the environment. Noble gas releases to the environment are unaffected by the presence of filters or sprays. Typically, single con- tainments employ spray systems with a chemical additive (e.g., sodium hydroxide, sodium tetraborate) to scavenge iodine from the containment atmosphere. The iodine removal rates of an ice condenser or a chemical additive spray system are determined. For atmosphere filtration systems verification of acceptability of design and efficiencies is provided by the ETSB under SRP Section 6.5.1. In dual containment systems, a determina- tion must be made by the AEB of the operational modes of the ESF with respect to the accident sequence in order for proper credit to be given. 6. The distances to the exclusion area boundary and to the LPZ outer boun- dary are determined from Sections 2.1.2 and 2.1.3 of the applicant's SAR and are verified by the reviewer with the Siting Analysis Branch (SAB). 7. The appropriate X/Q values to be used