A Green self-revealing finding was documented by the inspectors for the licensees failure to adequately perform a post maintenance test for Design Change Notice (DCN) 60683, Stage 8, resulting in draining approximately 3300 gallons of radioactive contaminated water from the Unit 1 refueling water storage tank into the auxiliary building. The inspectors determined that the licensees failure to implement an adequate post maintenance test for DCN 60683, install new connections for Fukushima modifications, as required by NPG-SPP-06.9.3, Revision 5, Plant Modification Testing, was a performance deficiency. The performance deficiency was determined to be more than minor because it adversely affected the Design Control attribute of the Mitigating Systems cornerstone to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the failure to implement an adequate post maintenance test resulted in the inoperability of the Unit 1 RWST. Using the screening worksheet of IMC 0609, Appendix A, Exhibit 2 Mitigating Systems Screening Questions, the inspectors determined that the finding was of very low safety significance (Green) because the resulting loss of Unit 1 RWST inventory was restored within the Technical Specification allowable time. The cause of the finding was directly related to the aspect of work management in the Human Performance crosscutting area because the licensee failed to implement a process of planning, controlling, and executing work activities such that nuclear safety was the overriding priority.
Failure to Perform an Adequate Post Maintenance Test Results in Draining of the Unit 1 RWST to a Level Below Technical Specification Limit
05000390/FIN-2014004-02
IR 05000390/2014004
≤30 September 2014 ≥30 September 2014
≤30 December 2013 ≥30 December 2013
~IR 05000390/2014001
~IR 05000390/2014002
~IR 05000390/2014003
~IR 05000390/2014004
~IR 05000390/2014005
~IR 05000390/2014007
~IR 05000390/2014403
~IR 05000390/2014404
~IR 05000390/2014405
~IR 05000390/2014406
~IR 05000390/2014602
~IR 05000390/2014603
~IR 05000390/2014604
~IR 05000390/2014605
~IR 05000390/2014607
~IR 05000390/2014608
~IR 05000390/2014609
~IR 05000390/2014611
~IR 05000390/2014612
~IR 05000390/2014613
~IR 05000390/2014614
~IR 05000390/2014615
~IR 05000391/2014001
~IR 05000391/2014601
~IR 05000391/2014602
~IR 05000391/2014603
~IR 05000391/2014604
~IR 05000391/2014605
~IR 05000391/2014606
~IR 05000391/2014608
~IR 05000391/2014611
~IR 05000391/2014612
~IR 05000391/2014614
~IR 05000391/2014615
~IR 05000391/2014616
Watts Bar 2014
!Licensee-identified ≥1 October 2013 Watts Bar ≤30 September 2014 23:59:59
Licensee-identified ≥1 October 2013 Watts Bar ≤30 September 2014 23:59:59
Watts Bar