NRC CAL – NOV (White)

On May 29, 2007, a Notice of Violation was issued for a violation associated with a White Significance Determination Finding involving the improper installation of the valve disk of a Containment Spray Header Isolation Valve. The improper installation resulted in a condition in which the actual position of the valve was nearly opposite of the indicated position. This condition resulted in an inoperable train of the containment spray system for an entire operating cycle and also provided a reactor coolant system diversion flow path if shutdown cooling was initiated following certain postulated accident conditions. The violation was cited against 10 CFR Part 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," for conducting maintenance activities without procedures that were appropriate to the circumstances. Specifically, the maintenance and post-maintenance procedures did not require actions to verify the correct orientation of the valve.