05000387/FIN-2014004-02
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Finding | |
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Title | |
Description | A finding of very low safety significance (Green) for inadequately implementing work instructions for the installation and calibration of the reactor recirculation pump (RRP) motor-generator (MG) set motor winding cooling air outlet temperature switch was selfrevealed when the Unit 1 B RRP tripped on August 27, 2014, requiring a rapid unplanned downpower and transition to single loop operation. The cause of the RRP trip was a calibration error made on May 7, 2014, in which the alarm and trip setpoints were reversed such that the pump trip occurred at expected temperatures for the plant conditions. PPLs immediate corrective actions included entering the issue into their corrective action program (CAP) as CR-2014-27243 and correcting the calibration error. The inspectors determined that PPLs failure to implement a work order (WO) as written or make changes as required by station procedures was a performance deficiency (PD) that was within PPLs ability to foresee and correct and should have been prevented. The PD was more than minor because it was associated with the Equipment Performance attribute of the Initiating Events cornerstone and affected its objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during power operations. Specifically, inadequate implementation of work instructions as directed resulted in the incorrect calibration of the B RRP MG set high temperature trip setpoint so that it was reached during normal operations, resulted in a trip of the B RRP, that required an unplanned rapid downpower to approximately 30 percent, and establishment of single loop operating conditions. The inspectors evaluated the finding in accordance with IMC 0609, Appendix A, "SDP for Findings At-Power," Exhibit 1 for the Initiating Events cornerstone. The inspectors determined the finding was of very low safety significance (Green) because it did not cause a reactor trip and the loss of mitigation equipment. This finding was determined to have a cross-cutting aspect in the area of Human Performance, Field Presence, because PPL did not ensure supervisory and management oversight of work activities, including contractors and supplemental personnel. Specifically, supervisory oversight of the calibration activity, including work package development, review of work performed and work package closeout, was insufficient to ensure that the changes made to the work package were processed in accordance with station procedures and did not result in a new deficiency being introduced [H.2]. |
Site: | Susquehanna |
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Report | IR 05000387/2014004 Section 4OA3 |
Date counted | Sep 30, 2014 (2014Q3) |
Type: | Finding: Green |
cornerstone | Initiating Events |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | C Graves E Burket F Bower J Cherubini J Greives T Daun |
CCA | H.2, Field Presence |
INPO aspect | LA.2 |
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Finding - Susquehanna - IR 05000387/2014004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2014Q3
Self-Identified List (Susquehanna)
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