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
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Content:
hat block. The reviewer should consider whether the applicant’s D3 assessment describes the diversity of the proposed DI&C system across blocks. When considering the effects of a postulated CCF, the reviewer may assume that the diverse blocks function as designed. This includes blocks that act to prevent or mitigate consequences of the CCF under consideration. 6.2 Documentation of Assumptions The reviewer should verify that the application documents and justifies any assumptions made to compensate for missing information in the design description materials or to explain interpretations of the analysis guidelines applied to the system. 6.3 Identification of Alternate Trip or Initiation Sequences The reviewer should verify that the applicant’s assessment includes analyses of the sequence of events that would occur if the primary trip channel failed to trip the reactor or actuate engineered safety features. The analyses may use realistic or conservative (design-basis) assumptions. When evaluating these analyses, the reviewer should coordinate with the NRC staff organization responsible for the review of reactor systems or PRA-based applications. 6.4 Identification of Alternative Mitigation Capability For each CCF, the reviewer should verify that the applicant has identified alternative mitigation actuation functions or design techniques that will prevent or mitigate core damage and unacceptable release of radioactivity. If a potential CCF in an automatic or manual function credited in the plant accident analysis is compensated for by a different automatic or manual function, the applicant should include a basis demonstrating that the different function provides adequate mitigation in the event conditions. If the application cites a manual operator action as a diverse means for responding to an event, the reviewer should verify that the applicant’s HFE analysis and assessment demonstrate (e.g., through the process in SRP Chapter 18) that this action is both