ENS 50191
ENS Event | |
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09:29 Apr 18, 2014 | |
Title | Masoneilan Actuators Discovered to Fail-Closed Instead of the Required Fail-Open Configuration |
Event Description | This is a non-emergency notification from Waterford 3 required under 10 CFR PART 21 concerning the deviation of a basic component from manufacturing purchase specifications.
On 04/18/2014, during pneumatic actuator replacement for Emergency Feedwater [EFW] valve EFW-224A (EFW to Steam Generator #1 Primary Flow Control Valve), it was identified that the fail action of the actuator was incorrect in that it was in a fail-closed instead of fail-open configuration. The actuator model, as identified in Waterford 3 site receipt/acceptance document and the actuator's name plate data, was a Masoneilan model 47 Sigma-F, which is specified as a fail-open actuator. However, the actuator was discovered to have a fail closed action, which is indicative of a Masoneilan model 48 actuator. The fail-action of these Masoneilan Sigma-F actuators can be changed in accordance with its technical manual TDM120.0565 with no additional parts; therefore, Waterford 3 corrected the fail action of EFW-224A's replacement actuator (to fail-open) and ensured the handwheel indicator was corrected prior to entering mode 4. Two of these actuators were received and accepted as Masoneilan model 47 Sigma-F (fail-open) actuators in September of 2010, both of which were labeled as such, yet configured in the fail-closed action. One of these two actuators remains in the warehouse and has been placed on hold. The vendor, Dresser Masoneilan, has been notified in writing on May 12, 2014. On 6/9/2014 at approximately 1600 CDT, Entergy concluded that for those potential applications of this valve operator model in the EFW system, had they been installed without correcting the deviation, it could have resulted in a substantial safety hazard in that it could have prevented fulfillment of EFW safety function, and therefore reportable under 10CFR PART 21. The Waterford 3 Site VP was informed on 06/11/2014. The licensee has notified the NRC Resident Inspector. |
Where | |
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Waterford Louisiana (NRC Region 4) | |
Reporting | |
10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
Time - Person (Reporting Time:+1320.03 h55.001 days <br />7.857 weeks <br />1.808 months <br />) | |
Opened: | John Jarrell 09:31 Jun 12, 2014 |
NRC Officer: | John Shoemaker |
Last Updated: | Jun 12, 2014 |
50191 - NRC Website | |
WEEKMONTHYEARENS 535592018-08-14T05:00:00014 August 2018 05:00:00
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