TS 6.8, Procedures and Programs, Section 6.8.1.a requires, in part, that written procedures be established, implemented, and maintained covering the activities recommended in Appendix A of
Regulatory Guide (RG) 1.33, Revision 2, February 1978.
RG 1.33, Appendix A, Section 8.b.(1).(dd) requires, in part, that procedures be established for safety valve surveillance tests. Contrary to the above, on March 12, 2015, engineers used an inadequate procedure to test
main steam safety valves. Specifically, engineering procedure EST-224, Insitu
Main Steam Safety Valve Test using Assist Device, did not adequately direct personnel to compensate for the head differential between the pressure
gauge and the seat of the
main steam safety valves. This resulted in the licensee incorrectly adjusting the setpoint of
MSSV MS-46 below
TS 3.7.1 limits while operating in Mode 1. The licensee identified this issue after incorrectly declaring the valve
operable. However, the licensee was able to restore the setpoint and operability of MS-46 within the
TS 3.7.1 Limiting Condition for Operation action time. This violation was determined to be of very low safety significance (Green) because the finding did not cause a
reactor trip or the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The licensee entered this issue into their
CAP as
AR #737961. As corrective actions, the licensee revised the procedure and restored the setpoint to within
TS 3.7.1 limits and retested MS-46.
