ENS 52934
ENS Event | |
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02:17 Apr 26, 2016 | |
Title | Part 21 Report - Relay Failure Due to Open Coil |
Event Description | Pursuant to 10 CFR 21, this is a non-emergency notification by Nebraska Public Power District (NPPD) concerning a defect in an Allen-Bradley 700DC-P220Z2 relay received at Cooper Nuclear Station.
On August 28, 2017, NPPD completed a 10 CFR 21 evaluation of a condition that was identified on April 25, 2016, associated with an Allen-Bradley 700DC-P220Z2 relay delivered by NuTherm. The evaluation was performed to determine the applications where the relays were approved for installation, where they were installed in the plant, and determine if the failure of the relays could result in a Substantial Safety Hazard as defined in 10 CFR 21. A model 700DC-P220Z2 relay failed after 133 hours0.00154 days <br />0.0369 hours <br />2.199074e-4 weeks <br />5.06065e-5 months <br /> of service. An independent laboratory determined the relay contained a wound wire fault at the beginning of the spool near the spool edge. The wire that faulted was connected to the right coil terminal. The fault was at a stress point where the wire came out of the insulating material channel and started onto the spool. Continuity testing indicated that the wire was open between the fault area and the terminal, within the potting material. The relay failure was a case of component infant mortality. It appeared the fault was caused by a manufacturing flaw that likely occurred due to a tensioning issue at the start of the coil wire winding process. This deviation presents a Substantial Safety Hazard as defined in 10 CFR 21, as this relay model was approved for use in safety related applications. The relay that failed was installed in the starter for the HPCI auxiliary lube oil pump and caused the HPCI system to be inoperable. This was reported to the NRC in ENS Notification 51882 at 0154 EDT on April 26, 2016 as a loss of safety function, but was not characterized as a 10 CFR Part 21 issue at that time. The relay model was approved for use in numerous HPCI starters and the Recirculation Pump discharge valves. The licensee notified the NRC Resident Inspector. |
Where | |
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Cooper Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
Time - Person (Reporting Time:+11748.5 h489.521 days <br />69.932 weeks <br />16.093 months <br />) | |
Opened: | David Van Der Kamp 14:47 Aug 28, 2017 |
NRC Officer: | Dong Park |
Last Updated: | Aug 28, 2017 |
52934 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 570012022-08-27T05:00:00027 August 2022 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Service Water Booster Pump Bearing Housing Cover Oil Leak ENS 529342016-04-26T02:17:00026 April 2016 02:17:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Relay Failure Due to Open Coil 2022-08-27T05:00:00 | |