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Green. A self-revealing Green NCV of LGS U … Green. A self-revealing Green NCV of LGS Units 1 and 2 technical specification 6.8.1 was identified when Exelon did not properly implement a surveillance procedure. Specifically, operators secured cooling water to the operating A control structure chilled water system (CSCWS) chiller unit which resulted in the unit automatically tripping to prevent damage. Operators subsequently restored cooling water flow in accordance with procedures. Exelon entered the issue into the corrective action program as IR 2720374. This finding is more than minor because it is associated with the human performance attribute of the mitigating systems cornerstone to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the loss of cooling water to the A CSCWS chiller unit resulted in a trip of the unit on high condenser pressure and rendered the chiller unavailable. Using IMC 0609, Appendix A, Exhibit 2, the inspectors determined that this finding was of very low safety significance (Green). Specifically, the finding did not represent a loss of system or function and did not represent the loss of a single train for greater than technical specification allowed outage times or greater than 24 hours. The inspectors determined that this finding has a cross-cutting aspect in the area of Human Performance, Avoid Complacency, because operators did not recognize and plan for the possibility of mistakes and inherent risk and did not use appropriate error reduction tools. (H.12) appropriate error reduction tools. (H.12) +

Discovered date

23:59:59, 31 December 2016 +

Docket

05000352 + and 05000353 +

Event date

23:59:59, 31 December 2016 +

Finding integer

2 +

Finding type

Non-cited violation +

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Hours

2.777778e-4 d (0.00667 hours, 3.968254e-5 weeks, 9.132e-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 71152, Problem Identification and Resolution (PI&R) +

Inspection report

IR 05000352/2016004 +

Inspector

S Barr +, Joseph Deboer +, Daniel Schroeder +, Matthew Fannon +, Michael Orr +, Peter Boguszewski +, Sherlyn Haney +, Scott Rutenkroger + and Peter Ott +

Issue report

AR 02720374 +

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12:56:19, 25 September 2017 +

Person