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:
of operation  testing results that conform to preestablished test cases to monitor for correctness of all outputs for every case b. Testing for latent design defects was conducted on a DI&C system that accurately represents the system to be installed, guaranteeing that the DI&C system installed will perform the same functions as the system tested. c. Testing results account for potential spurious operations. 3.1.3 Use of Alternative Approaches Other than Diversity and Testing to Eliminate the Potential for Common-Cause Failures from Further Consideration Applicants may propose technical approaches to address CCF that this BTP does not describe (e.g., a watchdog timer not dependent on the DI&C system software that puts the actuators in the safe state may address certain CCF vulnerabilities). These approaches may consist of design techniques, prevention measures, or mitigation measures other than diversity. The reviewer should determine whether an application requesting the use of an approach not described in this BTP includes a sufficient supporting technical basis, conditions of use, and acceptance criteria for its implementation. The NRC staff can approve methods through guidance (e.g., endorsement of a standard) or a safety evaluation (e.g., precedent, topical report). Generally, the review of the implementation of a method previously approved by the NRC consists of (1) ensuring that the method is implemented in a manner consistent with the purpose and conditions of use for which it was approved, and (2) ensuring that adequate justification is provided for any deviations from the approved method. Therefore, this BTP does not provide additional guidance in this regard. If the application credits an approach not previously approved by the NRC, the reviewer should determine the acceptability of the proposed method in accordance with the acceptance criteria described below. Generally, the proposal of an approach other than diversity or testing should consist of