Document: NUREG-0800
Document ID: 3d2920aa-e94d-41fa-ad13-de430eb636a6
Document Type: srp
Title: PRESSURE SUPPRESSION POOL AS A FISSION PRODUCT CLEANUP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350275.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.5
CFR Part: 
CFR Title: 

Content:
ce or maintenance must be supported by con- siderations of lowered operator dose and other projected benefits. For such plants, the charcoal filters must be at least maintained to the minimum level of Table 2 in Regulatory Guide 1.52 (Ref. 5), Revision 2. Acceptable methods for computing fission product retention by the suppression pool are given in subsection III, "REVIEW PROCEDURES." While granting credit for suppression pool scrubbing in the calculations of accident doses, the acceptance criteria of containment leakage in SRP Sec- tion 6.2.1.1.C and the acceptance criteria of the engineered safety feature atmosphere cleanup systems in SRP Section 6.5.1 should still be met. III. REVIEW PROCEDURES The reviewer selects and emphasizes specific aspects of this SRP section as are appropriate for a particular plant. The judgment on which areas need to be given attention and emphasis in the review is based on a determination of whether the material presented is similar to that recently reviewed on other plants and whether items of special safety significance are involved. The first step in the review is to determine whether or not the suppression pool is to be used for mitigating radiological consequences. If no credit is claimed for fission product removal in the accident analyses, no further review is required under this SRP section. If the suppression pool is intended as an engineered safety feature for mitiga- tion of radiological doses, then the reviewer estimates its effectiveness in removing fission products from fluids expelled from the drywell or directly from the pressure vessel through the depressurization system. 1. Pool Decontamination Factor The decontamination factor (DF) of the pool is defined as the ratio of the amount of a contaminant entering the pool to the amount leaving. Decon- tamination factors for each fission product form as functions of time can be calculated by the SPARC code (Ref. 6). An applicant may use the. SPARC code or other methods to