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:
control systems power sources needed to function to mitigate the event are available as required by the applicant's description of the event. P5B also, upon request from RSB, reviews the failure modes analysis of the ECCS to verify that an adequate analysis of possible failure modes of ECCS equipment and the effect of the failure modes on the ECCS performance has been provided. The Mechanical Engineering Branch (MEB) review of SRP Sections 3.6 and 3.9 includes a review of the effects of the blowdown loads on core support structures and on control rod guide structures. MES verifies, upon request from RS8, that the core remains in a coolable geometry following a loss-of-coolant accident and that the control rods can also be inserted. MEB also evaluates the effects of blowdown loads on the piping of the reactor coolant system and on the support structures of the components of the reactor coolant system. Upon request from RSB, MEB verifies that acceptable criteria (Ref. 5) have been employed in the design of the reactor coolant system and its supports to prevent failures in the reactor coolant pressure boundary on in engineered safety feature equipment in the event of a LOCA. For those areas of review identified above as being reviewed as part of the primary review responsibility of other branches, the acceptance criteria necessary for the review and their methods of application are contained in the referenced SRP section of the corresponding primary branch. II. ACCEPTANCE CRITERIA RSB acceptance criteria are based on meeting the relevant requirements.of the following regulations: a. 10 CFR Part 50, §50.46 and Appendix K as it relates to ECCS equipment being provided that refills the vessel in a timely manner for a loss-of- coolant accident resulting from a spectrum of postulated piping breaks within the reactor coolant pressure boundary. 15.6.5-3 Rev. 2 - July 1981 b. General Design Criterion 35 as it relates to redundant ECCS components being provided to adequately