Document: NUREG-0800
Document ID: bcc615f1-3f65-4757-994f-88cc8fe800d5
Document Type: srp
Title: should still be met.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070473.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.1
CFR Part: 
CFR Title: 

Content:
d valves. Confirmation should be made periodically that passive components, such as all essential spray and spray additive piping, and any passive mixing devices are free of obstructions. The contents of the spray additive storage tanks should be sampled and analyzed periodically to verify that the concentrations are within the established limits, that no concentration gradients exist, and that no precipitates have formed. 4. Evaluation The fission product removal effectiveness of the system is calculated to establish the degree of dose mitigation by the containment spray system following the postulated accident. The mathematical model used for this calculation should reflect the preceding steps of the review. The analysis and assumptions are as follows: a. The amounts of fission products assumed to be released to the containment space are obtained from Regulatory Guide 1.3 (Ref. 6) or Regulatory Guide 1.4 (Ref. 20 6.5.2-11 DRAFT Rev. 3 - April 1996 7), as appropriate. The amounts of fission product airborne inside the 21 containment building depend upon plate-out on interior surfaces, removal by the spray and action of other engineered safety features present, radioactive decay, and outleakage from the containment building. If the values in Position C.1.a of Regulatory Guides 1.3 and 1.4 are utilized in the calculations of fission product removal, then deposition by plateout, as described in Paragraph III.4.c of these procedures, should not be considered as an additional removal mechanism. Deposition by plateout is already accounted for in the Regulatory Guide values.22 Reviews performed for design certification of the CE System 80+ PWR and the GE ABWR have accepted the use of fission product assumptions described in draft NUREG-1465 (Reference 6). This approach requires an exemption from existing regulations that require the use of TID 14844 (Reference 7).23 b. The removal of fission products from the containment atmosphere by the spray is considered a first-order