Document: NUREG-0800
Document ID: fe8ec6c2-e960-404c-854f-55c77bde1672
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2400/ML24005A077.pdf
Revision Date: 2024-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ith the NRC’s position on addressing CCFs in DI&C systems as specified in SRM-SECY-22-0076 This BTP also addresses review of the applicant’s assessment of vulnerabilities to a CCF that can cause a spurious operation. It provides the NRC staff with guidance for evaluating applicant analyses of a DI&C system’s ability to withstand or cope with CCFs resulting in spurious operations. B. BRANCH TECHNICAL POSITION 1. Introduction The overall objective of this BTP is to provide criteria for the NRC staff’s evaluation of the acceptability of the applicant’s D3 assessment of the effects of CCFs in DI&C systems. For this evaluation, the reviewer should confirm that the application includes the following:  a description of the overall defense-in-depth posture to protect the plant from the effects of CCFs if they were to occur  identification and documentation of vulnerabilities to CCF  a documented basis for any safety-significance determinations used in the application  a failure analysis for any SSCs excluded from a D3 assessment 5 Section B.3.1 of this BTP describes how a potential CCF can be eliminated from further consideration. BTP 7-19-9 Revision 9 — May 2024  a description of any D3 assessment, including the following: – an evaluation of vulnerabilities to a CCF, and any means (e.g., design features or design techniques) used to eliminate the potential CCF from further consideration – identification and evaluation for effectiveness of any design features, design techniques, prevention measures, or mitigation measures, other than diversity, that are credited in the assessment – identification and evaluation for effectiveness of diverse measures credited by the applicant to mitigate potential consequences from CCF vulnerabilities – an assessment of the effects associated with residual CCF vulnerabilities that have not been either eliminated from further consideration or mitigated in some manner, and whether the assessment demonstrates