Document: NUREG-0800
Document ID: a20ea81d-33c2-4a0c-a3b4-216d45d6fccd
Document Type: srp
Title: FEEDWATER SYSTEM PIPE.BREAKS INSIDE AND OUTSIDE CONTAINMENT (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350148.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.8
CFR Part: 
CFR Title: 

Content:
total core reactivity, hot and average channel heat flux, and minimum departure from nucleate boiling ratio (DNBR). The sequence of events described in the applicant's safety analysis report (SAR) is reviewed by both RSB and ICSB. The RSB reviewer concentrates on the need for the reactor protection system, the engineered safety systems, and operator action to secure and maintain the reactor in a safe conditions. The analytical methods are reviewed by RSB to ascertain whether the mathematical modeling and computer codes have been previously reviewed and accepted by the staff. If a referenced analytical method has not been previously reviewed, the reviewer requests initiation of a generic evaluation of the new analytical model. RSB also reviews the values of all the parameters used in the analytical model. CPB reviews the initial conditions of the core and all nuclear design parameters. This includes power level, power distribution, Doppler coefficients, moderator temperature coefficients, void coefficients, reactor kinetics, DNB correlations, and control rod worth. A secondary review is performed by the Accident Evaluation Branch (AEB) and the results are used by ASB to complete the overall evaluation of the break analysis. The AEB evaluates the fission product release assumptions used in determining any offsite releases and verifies that the radiological consequences resulting from a feedwater pipe break are within acceptable limits as part of its primary review responsibility for SRP Section 15.6.5. The result of AEB's analysis is transmitted to RSB for use in the SER writeup. In addition, the RSB will coordinate other branches' evaluations that interface with the overall review of feedwater system pipe breaks as-follows: The Auxiliary Systems Branch (ASB) reviews the auxiliary feedwater system to verify that it can function following a feedwater line break, given a single active component failure and with either onsite or offsite power as part of its primary