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:
BTP 7-19-23 Revision 9 — May 2024  the design attributes and features of the DI&C system  the quality of the design process for the DI&C system  any applicable operating experience for the DI&C system Second, the reviewer should consider any failure analyses used in the qualitative assessment, including information from engineering design work, such as FMEA and FTA. The reviewer should consider whether the failure analyses support the factors above and whether they demonstrate, for example, that identified potential CCFs exhibit a low likelihood of occurrence. Acceptance Criteria for Use of Qualitative Assessment If the following acceptance criteria are met, the reviewer should conclude that the application includes a qualitative assessment (consistent with the methodology described in RIS 2002-22, Supplement 1) that demonstrates, for SSCs of low safety significance, that the likelihood of CCF is sufficiently low: a. The proposed DI&C system has design attributes and features that reduce the likelihood of CCFs. b. The quality of the design process for the proposed DI&C system reduces the likelihood of CCFs, including CCFs potentially resulting in spurious operations. c. The applicable operating experience collectively supports the conclusion that the proposed DI&C system will operate with high reliability for the intended application. In some cases, operating experience can compensate for uncertainties in addressing criteria (a) and (b). d. The proposed DI&C system will not cause a failure or spurious operation that could invalidate the plant licensing basis (e.g., the maintenance of diverse systems for reactivity control). e. The application documents the hazard analysis that demonstrates how hazardous effects, including spurious operations, are bounded or taken into account. 3.2 Use of Diverse Means to Mitigate the Impact of a Common-Cause Failure This section addresses applications that credit a diverse means to mitigate the impact of a postulated