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A finding of very low safety significance … A finding of very low safety significance was self-revealed on April 28, 2009, for the failure to follow maintenance procedure PTI-N41-P0002, Generator Switchgear Protective Relay Trip Test, when electricians performed maintenance on an incorrect relay associated with bus L11. Bus L11 was not previously identified as a protected component related to shutdown cooling. Therefore, no risk management actions were implemented by the licensee. The licensee posted bus L11 as a protected train and repaired the 1R22-Q103A and 86B circuitry. The licensee entered the issue into its corrective action program as CR-09-58187.The finding was determined to be more than minor because the finding was associated with the Initiating Events cornerstone attribute of equipment performance and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, had the 1R22-Q103A relay circuitry functioned as designed, a loss of decay heat removal event would have occurred. Using IMC 0609, Appendix G, Shutdown Operation Significance Determination Process, Checklist 8, the inspectors determined that the finding did not require a Phase 2 or Phase 3 analysis because the plant had appropriately met the safety function guidelines for core heat removal, inventory control, power availability, containment integrity, and reactivity control. The issue did not need a quantitative assessment and screened as having very low safety significance using Figure 1. This finding has a cross-cutting aspect in the area of human performance, work practices, per IMC 0305 H.4(a), because the licensee did not use error prevention techniques commensurate with the risk of the maintenance activity with the risk of the maintenance activity +

Discovered date

23:59:59, 30 June 2009 +

Docket

05000440 +

Event date

23:59:59, 30 June 2009 +

Finding integer

10 +

Finding type

Finding +

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INPO aspect

QA.4 +

Identified by

Self-revealing +

Inspection Manual Chapter

IMC 0305, Operating Reactor Assessment Program + and NRC Inspection Manual 0609, Appendix G +

Inspection procedure

IP 71153, Event Followup +

Inspection report

IR 05000440/2009003 +

Inspector

Jamnes Cameron +, David Jones +, Mark Franke +, M Phalen +, M Marshfield +, M Wilk +, J Coroju-Sandin +, Caroline Tilton +, R Leidy +, J Bashore + and Robert Murray +

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>.

00:37:38, 21 February 2018 +

Person