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The inspectors reviewed a self-revealing, … The inspectors reviewed a self-revealing, non-cited violation of Technical Specification 5.4.1.a, for failure to establish appropriate work instructions to properly preplan and perform maintenance that affected the performance of the reactor core isolation cooling system. Specifically, the work instructions failed to ensure that a steam supply drain pot drain alignment path was maintained while replacing valve packing 1-E51-F026. As a result, the drain path was isolated causing a group 4 isolation, which rendered the reactor core isolation cooling system unavailable. Operations personnel returned the reactor core isolation cooling system to operable status approximately 19 hours after the isolation occurred. This issue was entered into the licensees corrective action program as Condition Report CR-GGN-2015-01677. This performance deficiency is more than minor, and therefore a finding, because it is associated with the equipment performance attribute of the Mitigating Systems Cornerstone and adversely affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to have an adequate maintenance work instruction resulted in the unplanned unavailability of the reactor core isolation cooling system. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, and Inspection Manual Chapter 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, the inspectors determined that the finding is of very low safety significance (Green) because it: (1) was not a deficiency affecting the design or qualification of a mitigating structure, system, or component, and did not result in a loss of operability or functionality; (2) did not represent a loss of system and/or function; (3) did not represent an actual loss of function of at least a single train for longer than its technical specification allowed outage time, or two separate safety systems out-of-service for longer than their technical specification allowed outage time; and (4) did not represent an actual loss of function of one or more non-technical specification trains of equipment designated as high safety-significant in accordance with the licensees maintenance rule program. In addition, this finding has an avoid complacency cross-cutting aspect within the human performance area because the licensee failed to recognize and plan for the possibility of mistakes, inherent risks, and properly implement appropriate error reduction tools. Specifically, the licensee failed to recognize the importance of having a drain path during the entire maintenance activity to properly plan the activity using appropriate configuration control and work instructions.nfiguration control and work instructions.

Discovered date

23:59:59, 30 June 2015 +

Docket

05000416 +

Event date

23:59:59, 30 June 2015 +

Finding integer

1 +

Finding type

Non-cited violation +

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Hours

2.199074e-4 d (0.00528 hours, 3.141534e-5 weeks, 7.2295e-6 months) +

INPO aspect

QA.4 +

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 71111.12 +

Inspection report

IR 05000416/2015002 +

Inspector

Ryan Alexander +, J Mateychick +, Mark Schwieg +, Nick Taylor +, Louis Carson +, Greg Warnick +, Neil Day + and Matt Young +

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>.

12:58:15, 25 September 2017 +

Person