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The inspectors identified a self-revealing … The inspectors identified a self-revealing Green NCV for failing to comply with Technical Specification (TS) Limiting Condition of Operation (LCO) 3.8.1, Electrical Power Systems, Alternating Current (AC) Sources Operating, from February 26, 2014, to March 29, 2016. Specifically, Entergy failed to maintain the auto transfer function for the 6.9 kilovolt (kV) offsite electrical buses in an operable condition because the safety injection (SI) anticipatory signal to the station auxiliary transformer (SAT) load tap changer (LTC) was disconnected. As a result, one of two qualified offsite AC circuits was not operable. Entergy initiated corrective actions and promptly restored the SAT LTC SI signal to operation prior to restarting the plant from the refueling outage. The failure to restore the LTC SAT SI signal following maintenance activities was a performance deficiency that was more than minor because it is associated with the Equipment Performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective 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 reinstate the SAT LTC SI anticipatory signal following maintenance resulted in the qualified offsite source of AC power becoming inoperable for a period of time in excess of the TS allowable outage time. In accordance with IMC 0609, Appendix A, The Significance Determination Process for Findings at Power, the inspectors determined that the finding was of very low safety significance (Green) because a detailed risk analysis determined the likelihood of core damage was less than E-8/year. The inspectors determined that the finding had a cross-cutting aspect of Human Performance, Work Management, because Entergy did not implement a process of controlling and executing work activities. The work process did not coordinate with different groups or job activities to ensure the state links were restored at the end of the work activities.estored at the end of the work activities.

Discovered date

23:59:59, 30 September 2016 +

Docket

05000247 +

Event date

23:59:59, 30 September 2016 +

Finding integer

6 +

Finding type

Non-cited violation +

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INPO aspect

WP.1 +

Identified by

Self-revealing +

Inspection Manual Chapter

NRC Inspection Manual 0609/Appendix A, The Significance Determination Process (SDP) for Findings At-Power +

Inspection procedure

IP 71153, Event Followup +

Inspection report

IR 05000247/2016003 +

Inspector

G Newman +, S Rich +, J Amberosini +, Joseph Furia +, Frank Arner +, Eugene Dipaolo +, Brian Haagensen + and Sarah Elkhiamy +

Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

12:56:51, 25 September 2017 +

Person