Document: NUREG-0800
Document ID: 35cc4067-cb3a-4cce-af56-bc0c3fd56f33
Document Type: srp
Title: PRESSURE SUPPRESSION POOL AS A FISSION PRODUCT CLEANUP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600409.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.5
CFR Part: 
CFR Title: 

Content:
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. 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. The reviewer has an option to perform an independent confirmatory calculation of the DF. If the SPARC code is used for a confirmatory calculation of fission product decontamination, the review should take care in proper establishment of the input parameters for the calculations. 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 decontamination, D, to be used for accident dose calculations, may be taken as: D = ___D F___ 1 + B(DF-1) The reviewer should clearly distinguish that fraction of B, that may be further treated by the standby gas treatment system from that fraction of B that also bypasses the secondary containment building. 6.5.5-7 Revision 1 - March 2007 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 technical specifications are reviewed to ensure that they require periodic inspection to confirm suppression pool depth and surveillance tests to confirm drywell leak tightness, consistent with the bypass fraction used in computing the overall decontamination. 5. For review of a DC application, the reviewer should