ENS 52480
ENS Event | |
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21:04 Nov 10, 2016 | |
Title | Part 21 - Failure of Power Supplies to Meet Voltage Stability Specifications |
Event Description | This notification is a 10 CFR 21.21(a)(2) interim report for power supply model N-2ARPS-A6. Two instrument power supplies for the 'B' Residual Heat Removal (RHR) system were being bench tested prior to installation when it was discovered that they failed to meet Vendor Technical Manual specifications for voltage stability for varying loads. The deviation was a voltage drop of approximately 300mV. This did not meet the specification of less than 150mV when varying current from 5 amps (full load) to 2.5 amps. A second replacement power supply exhibited a similar 300 mV drop.
James A. FitzPatrick (JAF) reviewed the work order instructions to determine if there was a deviation from the recommendations in the Foxboro technical manual F180-0309 Spec 200 Multinest Power Supply 2ARPS Series calibration. Since as-found voltage readings were within the required tolerance of the RHR instrument loops, the power supplies appear to have been capable to perform their intended function. However, this evaluation did not troubleshoot why the power supplies failed to meet the calibration requirements. The power supplies were sent to a repair vendor. The input from this vendor is expected to allow JAF to complete the evaluation per 10 CFR 21.21(a)(1) by March 21, 2017, and a notification for failure to comply or defect per 10 CFR 21.21(d)(3)(i) is expected by March 24, 2017, if necessary. This notification is being submitted as an interim report per 10 CFR 21.21(a)(2). The licensee notified the NRC Resident Inspector. |
Where | |
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Fitzpatrick ![]() New York (NRC Region 1) | |
Reporting | |
10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
Time - Person (Reporting Time:+1465.68 h61.07 days <br />8.724 weeks <br />2.008 months <br />) | |
Opened: | Mark Hawes 22:45 Jan 10, 2017 |
NRC Officer: | Donald Norwood |
Last Updated: | Jan 10, 2017 |
52480 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (67 %) |
After | Power Operation (67 %) |
WEEKMONTHYEARENS 524802016-11-10T21:04:00010 November 2016 21:04:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Failure of Power Supplies to Meet Voltage Stability Specifications 2016-11-10T21:04:00 | |