ENS 49908
ENS Event | |
|---|---|
04:00 Jan 16, 2014 | |
| Title | Part 21 - Unseating Of Valve Spring On Scram Solenoid Pilot Valve |
| Event Description | This concerns an evaluation being performed by GE Hitachi Nuclear Energy (GEH) regarding a malfunction of a Scram Solenoid Pilot Valve (SSPV), which has been observed to impair control rod scram performance. As stated herein, GEH has not concluded that this is a reportable condition in accordance with the requirements of 10CFR 21.21(d). The SSPV manufacturer (ASCO Valve, Inc.) has not yet concluded its own investigation under 10CFR 21, and the results of that investigation are needed as input for the GEH evaluation. The manufacturer has issued an Interim Report, which provides confidence that this condition is limited to a very small portion of the suspect population.
A malfunction of a Scram Solenoid Pilot Valve was attributed to the disengagement of the valve spring from the valve plunger. The effect of the malfunction is to degrade scram performance of an affected control rod. The safety significance of this condition cannot be determined at this time, but several mitigating and compensatory functions have been identified. This evaluation affects Fermi 2, Columbia, Dresden 2-3, Oyster Creek, Peach Bottom 2-3, Quad Cities 1-2, and Browns Ferry 1-3.
Subject: Completed Evaluation of Part 21 Potentially Reportable Condition Notification: Unseating of Valve Spring on SSPV This letter provides information concerning an evaluation now completed by GE Hitachi Nuclear Energy (GEH) regarding the malfunction of Scram Solenoid Pilot Valves (SSPVs), which have been observed to impair control rod scram performance. As stated herein, GEH has concluded this condition is Not Reportable for two of the affected plants (Enrico Fermi 2 and Columbia Generating Station plants), but GEH does not have sufficient information to fully evaluate the safety significance of the condition for the remainder of the potentially affected plants. Given that, GEH closes this 10 CFR Part 21 evaluation with a Transfer of Information to potentially affected licensees, in accordance with the requirements of 10 CFR 21.21(b) and will communicate the determination of Not Reportable to the identified plants where sufficient information was available to make that determination. Although the Enrico Fermi 2 and Columbia Generating Station plants are included in the attached list of U.S. plants potentially affected, inspections of all suspect SSPVs remaining at those plants indicate that no other SSPVs at those plants exhibit the condition (as informally reported to GEH), and therefore those plants were determined to not have a reportable condition. This letter closes the supplemental 60-Day Interim Report Notification (MFN 14-010 R0), provided on March 13, 2014, per 10 CFR 21.21(a)(2). If you have any questions, please call me at (910) 819-4491. Sincerely, Dale E. Porter Safety Evaluation Program Manager GE-Hitachi Nuclear Energy Americas LLC Notified R1DO (Gray), R2DO (Musser), R3DO (Orth), R4DO (Miller) and NRR Part 21 Group via email. |
| Where | |
|---|---|
| Asco Valve, Inc. Wilmington, North Carolina (NRC Region 1) | |
| Organization: | Ge Hitachi Nuclear Energy |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+1354.08 h56.42 days <br />8.06 weeks <br />1.855 months <br />) | |
| Opened: | Lisa Schichlein 13:05 Mar 13, 2014 |
| NRC Officer: | Dong Park |
| Last Updated: | Jul 23, 2014 |
| 49908 - NRC Website | |
Asco Valve, Inc. with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 499082014-01-16T04:00:00016 January 2014 04:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Unseating of Valve Spring on Scram Solenoid Pilot Valve 2014-01-16T04:00:00 | |