Document: NUREG-0800
Document ID: 3006d57d-d68e-41da-8ef9-9217d041a456
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF A DESIGN BASIS LOSS-OF-COOLANT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350166.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.5
CFR Part: 
CFR Title: 

Content:
ation, the total doses should be within the guideline values of Regulatory Guide 1.3 (Ref. 3). The acceptability is determined under SRP Section 15.6.5, Appendix A. III. REVIEW PROCEDURES The reviewer selects and emphasizes aspects covered by this SRP section which are appropriate for a particular case. The judgment of which areas need to be given attention and emphasis in the review is based on a determination if the material presented is similar to that recently reviewed on other plants or that items of special safety significance are involved. The applicant's description of the MSIVLCS is reviewed with respect to the system performance and to obtain the information needed to perform the dose calculation. For'a positive sealing system, verification of the system operability assuming a single active failure, actuation time, and identification of any potential release paths is obtained from the ASB. If the reviewer finds that no release paths exist and that the system can be actuated prior to the steamline pressure decreasing below the drywell pressure, no further review is required. For a vacuum-type sytem, which processes rather than seals the leakage, the AEB reviewer obtains the following information, assuming the most adverse sin- gle failure of an active component: 1. release paths and fractions of the leakage through these paths, as a function of time, e.g., steam leakage, releases through a depressurization line, releases through drain lines, etc., 2. system actuation time, 3. flow rates as a function of time, and 4. release points. This information should be verified by the ASB (and documented by .buckslip to the AEB). Interaction with systems used to mitigate the consequences of con- tainment leakage should be noted. The AEB reviewer should consult with the CSB to assure that the operation of the MSIVLCS does not adversely affect pressure transients in secondary containment regions. The system is then modeled using a computer code (Ref. 4). The source