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The following licensee-identified violation of NRC requirements was determined to be of very low safety significance and met the NRC Enforcement Policy criteria for being dispositioned as a Non-Cited violation. Watts Bar Unit 1 TS 3.6.3, Containment isolation Valve, Condition A, states, in part, that a penetration flow path with one containment isolation valve inoperable to be isolated by use of at least one closed and deactivated automatic valve, closed manual valve, blind flange, or check valve with flow through the valve secured within four hours. Contrary to this requirement, Watts Bar Nuclear Plant Unit 1 containment isolation valve 1-FCV-61-122, Glycol cooled floor return header isolation was inoperable on March 5, 2016, at 1512 EST, and the penetration associated with this containment isolation valve was not isolated until 2113 EST on March 5, 2016. TS 3.6.3, Condition A, has a required completion time of four hours; however, valve 1-FCV-61-110 was not closed until six hours into the event. The licensee has entered this event into their corrective action program under CR 1146157. This licensee-identified violation of NRC requirements was determined to be of very low safety significance, Severity Level IV, and met the NRC Enforcement Policy Section 2.3.2 criteria for being dispositioned as a non-cited violation. The performance deficiency was more than minor because it was associated with the reactor containment barrier performance attribute of the barrier cornerstone in NRC IMC 0609, Attachment 04, dated October 7, 2016. This finding was further evaluated in accordance with NRC IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, dated June 19, 2012. The finding screened to Green since there was no actual open pathway in the physical integrity of the reactor containment.
|Report||IR 05000390/2017004 Section 4OA7|
|Date counted||Dec 31, 2017 (2017Q4)|
|Inspectors (proximate)||A Masters|
|Violation of:||Technical Specification|
Finding List (Watts Bar) @ 2017Q4
Self-Identified List (Watts Bar)