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The NRC identified a non-cited violation o … The NRC identified a non-cited violation of Title 10 Code of Federal Regulations (10 CFR) Part 50.63, Loss of all alternating current power, for the licensees failure to meet their commitment to the guidance in NRC RG 1.155, Station Blackout. Specifically, the licensees preventive maintenance and testing program did not identify required tests and inspections, and was not implemented such that it demonstrated system readiness and reliability requirements would be met as required by RG 1.155. In response, the licensee entered the issue into their corrective action program as action request 2053938, and initiated actions to determine which vendor recommended activities were needed to be performed to meet their RG 1.155 commitments and began updating their PM schedule and maintenance procedures. This performance deficiency was more than minor because it could lead to a more significant safety concern if left uncorrected. Specifically, transformer components degrade over time, and in the absence of appropriate testing and maintenance, could degrade to the point where the transformer may fail when called upon to mitigate an SBO. The team determined the finding to be of very low safety significance (Green) because the finding was a deficiency affecting the design or qualification of a mitigating structure, system, or component (SSC), and the SSC maintained its operability or functionality. The team determined that the finding was indicative of current licensee performance, because AR 643531 was written on November 11, 2013, which described that appropriate maintenance and testing was not being performed on the DS transformer, however, the impact on the stations RG 1.155 commitments was not evaluated. A cross-cutting aspect of Evaluation (P.2) in the Problem Identification and Resolution area was assigned because the licensee did not thoroughly evaluate the issue to ensure that the resolution addressed the cause and extent of condition commensurate with its safety significance.commensurate with its safety significance.

Discovered date

23:59:59, 30 September 2016 +

Docket

05000261 +

Event date

23:59:59, 30 September 2016 +

Finding integer

2 +

Finding type

Non-cited violation +

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PI.2 +

IR 05000261/2016008 +

Inspector

J Bartley +, S Herrick +, O Mazzoni +, Teh-Chiun Su +, Geoffrey Ottenberg + and Ronald Cureton +

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>.

12:56:41, 25 September 2017 +

Person