Document: NUREG-0800
Document ID: a52f76c0-2afc-4d48-b4c4-422dbb4cb298
Document Type: srp
Title: 2
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350392.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.4
CFR Part: 
CFR Title: 

Content:
ection. (f) The most limiting plant systems single failure, as defined in the "Definitions and Explanations" of Appendix A to 10 CFR Part 50, shall be identified and assumed in the analysis and should satisfy the guidance stated in Regulatory Guide 1.53. The applicant's analysis of the most limiting transiets should be performed using an acceptable model. If analytical methods which have not been approved are proposed by the applicant, they are evaluated by the staff for acceptability. The values of parameters used in the analytical model are to be suitably conservative. The following values are considered acceptable: a. Initial power level is rated output (licensed core thermal power) for the number of loops initially assumed to be operating plus an allowance of 2% to account for power measurement uncertainty. An analysis to determine the effects of a flow increase must be made for each allowed mode of opera- tion (i.e., one, two, or three loops initially operating) or the effects referenced to a limiting case.