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:
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 calculate the retention of fission products within the pool, provided that these methods are described in the SAR adequately to permit review. If the time-integrated DF values claimed by the applicant for removal of particulates and elemental iodine are 10 or less for a Mark II or a Mark III containment, or are 5 or less for a Mark I containment, the applicant's values may be accepted without any need to perform calculations (Refs. 7 and 8). A DF value of one (no retention) should be used for noble gases and for organic iodides. The applicant should provide justification for any DF values greater than those given above. If.the SPARC code is used for the calculation of fission product decon- tamination, the review should be coordinated with the branch that is responsible for establishing the input parameters for the calculations. 6.5.5-3 Rev. 0 - December 1988 2. Pool Bypass Fraction The fraction of the drywell atmosphere bypassing the suppression pool by leaking through drywell penetrations is obtained as a product of the review under SRP Section 6.2.1.1.C. If B is the bypass fraction and DF is the time-integrated pool decontamination factor, then the overall decon- tamination, D, to be used for accident dose calculations, may be taken as: ID DF D + B(DF-1) The reviewer should clearly distinguish that fraction of B, which may be further treated by the standby gas treatment system, from that fraction of B which also bypasses the secondary containment building. 3. Other Containment Atmosphere Cleanup Systems Drywell or containment spray systems for which fission product cleanup credit is claimed are reviewed under SRP Section 6.5.2, and credit for both suppression pool and spray cleanup can be given as a result of the separate reviews. 4. Technical Specifications The