A self-revealing non-cited violation (
NCV) for failure to meet the requirements of plant
Technical Specification (TS) 5.4, Procedures was identified. While realigning equipment to support the filling and venting of the Unit 2
containment spray header the system operator inadvertently closed
1HV-9017A, refueling water storage tank (
RWST) suction to Unit 1
containment spray (
CS) pump A. As a result, the 1A
CS pump was temporarily rendered
inoperable. The valve was subsequently re-opened and the pump was declared
operable. The licensee entered the issue into their corrective action program (CR 608718). This finding is more than minor because it is associated with the human performance attribute of the
barrier integrity cornerstone and it adversely affected the cornerstone objective to provide reasonable assurance that physical design barriers (
fuel cladding,
reactor coolant system, and containment) protect the public from radionuclide releases caused by accidents or events. Specifically, the performance deficiency is a human performance error which affected the availability, reliability, and capability of the Unit 1 A train
containment spray system to limit and maintain post accident conditions to less than containment design values. Because the inspectors answered No to all of the
IMC 0609 Appendix A (dated June 19, 2012) Exhibit 3, Section B,
Barrier Integrity Cornerstone Screening Questions, the inspectors concluded that the finding was of very low safety significance (Green). The inspectors determined that the cause of this finding was related to the work practices component of the human performance crosscutting area due to less-than-adequate human error prevention techniques. Specifically, peer checking techniques were less than adequate.
