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:
is simple enough to allow such testing. Testing can be used to uncover latent design defects for correction in the design process and to demonstrate that any identified latent design defects have been corrected. The reviewer should determine whether testing of the proposed DI&C system shows that all latent design defects have been identified and corrected, so that the system will function as specified under the AOOs. If so, the CCF can be eliminated from further consideration. The applicant may use various testing methods, which the reviewer should consider on a case-by-case basis. In each case, the reviewer should consider whether the technical basis for these testing methods is acceptable. Acceptance Criteria for Use of Testing If the following acceptance criteria are met, the reviewer should conclude that the application provides sufficient information on the test results and testing methodology for the DI&C system to eliminate the potential CCF from further consideration: BTP 7-19-21 Revision 9 — May 2024 a. Testing covers the expected performance of the proposed DI&C system in each of its functional modes of operation and for all transitions between modes. For this purpose, testing should include the following:  every possible combination of inputs, including every possible sequence of inputs (if the system has unused inputs, and the system can force them to a defined safe state (e.g., during a system failure), then those inputs need not meet this criterion)  for systems with analog inputs, every combination of inputs over the entire operational range of the analog inputs, including defined over-range and under-range conditions  every possible executable logic path (includes nonsequential logic paths)  every functional state transition among all modes 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