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A self-revealing NCV of TS 3.4.3, Safety R … A self-revealing NCV of TS 3.4.3, Safety Relief Valves was identified for two required MSRVs being inoperable longer than the allowed outage time and follow on action completion time. The licensees immediate corrective action was to replace all Unit 3 MSRV pilot valves prior to the completion of the refueling outage. This issue was entered into the licensees corrective action program as CR 1157981. The performance deficiency was more than minor because it adversely affected the Mitigating Systems cornerstone attribute of equipment performance. Specifically, two required MSRVs were not able to lift within their required pressure band. This performance deficiency was screened using NRC IMC 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012. This performance deficiency screens to Green because although the system was inoperable for greater than its allowed outage time and follow on action completion time, the system maintained its safety function. The inspectors assigned a cross cutting aspect of Resolution since the licensee has not taken sufficient corrective actions to address the continued out of tolerance lift results caused by corrosion bonding of the MSRV pilot valve seats. (P.3)nding of the MSRV pilot valve seats. (P.3) +

Discovered date

23:59:59, 30 September 2016 +

Docket

05000296 +

Event date

23:59:59, 30 September 2016 +

Finding integer

6 +

Finding type

Non-cited violation +

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INPO aspect

PI.3 +

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 71153, Event Followup +

Inspection report

IR 05000260/2016003 +

Inspector

David Lanyi +, H Bundy +, David Dumbacher +, Alan Blamey +, Adam Ruh + and Tom Stephen +

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12:56:43, 25 September 2017 +

Person