Document: NUREG-0800
Document ID: 8940dd69-2a01-4786-bbe6-f71794a60643
Document Type: srp
Title: LOSS-OF-COOLANT ACCIDENTS RESULTING FROM SPECTRUM OF POSTULATED PIPING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350156.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.5
CFR Part: 
CFR Title: 

Content:
es (ECCS, reactor coolant system, reactor core, etc.) between the facilities in question are reviewed. If there are significant differences, sensitivity studies on the important parameters should have been made by the applicant. If-such sensitivity studies are not presented in the SAR, the reviewer requests that they be made. 4. The parameters and assumptions used for the calculations conform to those of the approved evaluation model and were conservatively chosen, including the following points: a. The initial power level is taken as the licensed core thermal power for the number of loops initially assumed to be operating plus an allowance of 2% to account for power measurement uncertainties, unless a lower power level can be justified by the applicant. The number of loops operating at the initiation of the event should correspond to the operating condition which maximizes the consequences of the event. b. The maximum linear heat generation rate used should be based on 102% of the proposed licensed core thermal power and the technical speci- fication limit on peaking factors, or on the technical specification limits on maximum linear heat generation rate. c. All permitted axial power shapes, as given in Section 4.3 of the SAR, should be addressed by the analyses. Normally, the evaluation model will identify the least favorable axial shape as a function of break size. If the evaluation model did not discuss'axial shapes, or the discussion is not applicable to a given case, sensitivity studies are requested. d. The initial stored energy was conservatively calculated by the applicant. The value used is checked against the applicant's steady- state temperatures, as given in SAR Section 4.4, similiar calculations performed-by the staff, or calculations done for similar plants by previous applicants. e. Appropriate analyses are presented to support any credit taken for control rod insertion. f. The applicant's analysis conservatively addresses the operation of the