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
CFR Part: 
CFR Title: 

Content:
pplication provides sufficient information on the test results and testing methodology for a device or component to eliminate a potential CCF from further consideration. The acceptance criteria are as follows: a. Testing covers the expected performance of the proposed I&C system in each of its functional modes of operation and for all transitions between modes. For this purpose, testing may 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 BTP 7-19-22 Revision 8 – January 2021 correctness of all outputs for every case b. Testing for latent design defects was conducted on a system that accurately represents the system to be installed, guaranteeing that the 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 Methods to Eliminate the Potential for Common-Cause Failure from Further Consideration Licensees may propose technical approaches to address CCF that this BTP does not describe. These may be alternative methods previously approved by the NRC (e.g., defensive measures), or the licensee may be requesting approval in its application. The NRC’s approval of an alternative method should include a supporting technical basis and acceptance criteria for its use. The reviewer should confirm that any previously approved alternative method credited in an