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A finding of very low safety significance … A finding of very low safety significance with an associated NCV of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was self-revealed when the licensee failed to perform preventive maintenance on the Unit 1 reactor core isolation cooling (RCIC) electronic governor-remote (EGR) actuator. Specifically, from June 4, 1993, to November 17, 2016, the licensees processes for the control and administration of preventive maintenance failed to ensure that the Unit 1 RCIC EGR actuator was replaced or refurbished on an interval that would prevent internal fouling of the EGR actuator from adversely affecting governor performance. As a result, contaminates and degradation accumulated in the EGR actuator from January 16, 2004, to November 17, 2016, ultimately causing the RCIC turbine to trip during quarterly surveillance testing on October 18, 2016, and again on November 17, 2016. The licensee entered this issue into the CAP as ARs 02729757 and 02742254. Corrective actions planned and completed included replacing the Unit 1 and Unit 2 RCIC EGRs and performing a root cause evaluation of the degraded condition. The performance deficiency was more than minor, and thus a finding because it was associated with the Mitigating Systems cornerstone attribute of equipment performance and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the failure to perform preventive maintenance on the Unit 1 RCIC EGR resulted in a degraded condition which adversely affected the reliability of the system to respond to an initiating event. A detailed risk evaluation determined that the finding screened as having very low safety significance (Green). This finding did not have a cross-cutting aspect because the performance deficiency was not indicative of current licensee performance.ndicative of current licensee performance. +

Discovered date

23:59:59, 31 December 2016 +

Docket

05000373 +

Equipment trip

Turbine Trip +

Event date

23:59:59, 31 December 2016 +

Finding integer

3 +

Finding type

Non-cited violation +

Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

Identified by

Self-revealing +

Inspection procedure

IP 71152, Problem Identification and Resolution (PI&R) +

Inspection report

IR 05000373/2016004 +

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>.

00:55:31, 21 February 2018 +

2016Q4 +

Green +

23:59:59, 31 December 2016 +

System

Reactor Core Isolation Cooling +

Title

Failure to Perform Preventive Maintenance Resulting in Two Subsequent Unit 1 RCIC Turbine Trips During Surveillance Testing +

Violation of

10 CFR 50 Appendix B, Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants + and 10 CFR 50 Appendix B Criterion V, Instructions, Procedures, and Drawings +

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