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:
from these acceptance criteria, the staff should review the applicant’s evaluation of how the 6.5.5-6 Revision 1 - March 2007 proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 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 mitigation 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. If RG 1.183 assumptions are used, the basis for the amount of fission products that pass through the suppression pool must be provided by the applicant. If the values in Regulatory Guide 1.3, Position C.1.a, are used in the calculations of fission product removal, then deposition by plateout or natural deposition should not be considered as an additional removal mechanism. Deposition by plateout is already accounted for in Regulatory Guide 1.3, Position C.1.a. 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. Decontamination factors for each fission product form as functions of time can be calculated by the SPARC code. 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