Document: NUREG-0800
Document ID: 848ab24d-ac9b-4ec5-85ff-099e13b769c3
Document Type: srp
Title: CONTAINMENT SPRAY AS A FISSION PRODUCT CLEANUP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0601/ML060150001.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.2
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. Fission Product Removal Effectiveness (primary reviewer) | 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 (Reference 4), Regulatory Guide 1.4 (Reference 5), or Regulatory Guide 1.183 (Reference 6) as appropriate. The amounts | of airborne fission product inside the containment building depend on plateout on interior surfaces, removal by the spray system and other engineered safety features present, radioactive decay, and outleakage from the containment building. If the value in Position C.1.a of Regulatory Guides 1.3 (Reference 4) and 1.4 | (Reference 5) is used in the calculation of fission product removal, then deposition by | plateout, as described in paragraph III.4.c of this SRP section, should not be | considered as an additional removal mechanism. Deposition by plateout is already | accounted for in the regulatory guide values. | b. The removal of fission products from the containment atmosphere by the spray is considered a first-order removal process. The removal coefficient 8 (lambda) for each of the sprayed regions of the containment is computed. Removal coefficients for time-dependent wall plateout are also calculated. The coefficients for