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:
ar 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 reactor coolant pump. 15.6.5-5 Rev. 2 - July 1981 5. Reactor protection system actions and safety injection actuation and delivery are consistent with the set points and the associated uncertain- ties and delay times listed in the SAR (OL review). The ECCS flow rates should be checked against the applicant's data on head-flow characteristics of the ECCS pumps given in Section 6.3 of the SAR and against typical safety injection tank discharge curves used for the analysis. The Regional Offices under the Office of Inspection and Enforcement may be requested to provide data of this type from the startup tests for new designs and from periodic tests on duplicate designs. 6. The results of the applicant's calculations are consistent with those of staff calculations for typical plants and also with the results of calcu- lations performed for similar systems by previous applicants. The following variables should be reviewed on a generic basis and spot-checked thereafter: power transients for various breaks; pressure transients at various system locations; flow transients near the break, in the core, and in the downcomer; reactor coolant temperature and quality at core inlet, core outlet, and in-core; cladding temperature transients (core average, hot assembly, hot pin); heat transfer coefficients during blow- down, refill, and reflood; heat flux transients from piping and vessel walls, primary-secondary heat transfer (PWRs only); timing of clad rupture (if the peak clad temperature could be appreciably- higher when perforation occurs at a different but equally probable time, calculations with modified assumptions are requested); peak clad temperature as a function of break size (if it is uncertain whether the peak value has been found, additional calculations are requested);