Document: NUREG-0800
Document ID: 96afb1d6-6ce9-41e4-b4ec-1fc7747bc0b2
Document Type: srp
Title: Revision 8 – January 2021
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A647.pdf
Revision Date: 2023-05
Chapter: 7
Section ID: 7
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Content:
es how a potential CCF can be eliminated from further consideration. BTP 7-19-9 Revision 8 – January 2021 with the NRC’s position on addressing CCFs in DI&C systems as specified in SRM-SECY-93-087 and SECY-18-0090 This BTP also addresses review of the applicant’s assessment of vulnerabilities to a CCF that can cause a spurious operation. It provides the staff with guidance for evaluating applicant analyses of a proposed modification’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 staff’s evaluation of the acceptability of the applicant’s D3 assessment of proposed DI&C systems.6 For this evaluation, the reviewer should confirm that the application includes the following: • a description of the overall defense-in-depth posture of plant control and protection systems adequate 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 • a description of any D3 assessment, including the following: – an evaluation of vulnerabilities to a CCF, and any means used to eliminate the potential CCF from further consideration – 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 that the consequences of the residual CCF remain acceptable The reviewer should consider whether the applicant’s assessment has properly identified and addressed CCFs and whether the applicant has incorporated