ENS 51294
ENS Event | |
|---|---|
05:00 Jun 16, 2015 | |
| Title | Part 21 Report - Abb 50H Instantaneous Over Current Protection Relay Failure |
| Event Description | The following information was excerpted from a facsimile received from the Xcel Energy:
Pursuant to 10 CFR 21.21(d)(3)(i) Northern States Power Company, a Minnesota corporation, doing business as Xcel Energy, submits the attached initial notification of failure to comply or existence of a defect. If there is any question or if additional information is needed, please contact Dr. Glenn A. Carlson, P.E., at (651) 267-1755. Name and address of the individual or individuals informing the Commission: Scott M. Sharp, Site Operations Director, Prairie Island Nuclear Generating Plant (PINGP), Northern States Power Company - Minnesota, 1717 Wakonade Drive East, Welch, MN 55089 Identification of the facility, the activity, or the basic component supplied for such facility or such activity within the United States which fails to comply or contains a defect: ABB Power T&D Company Inc., Relay, Overload, Overcurrent, 58/125VDC, Type: 50H, Cat.: 468S0475, 1.B.: 7.2.1.7-3 Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect or failure to comply: During bench testing to calibrate the relay, 125 VDC was applied to the relay with no noticeable effect. This was shop work on a spare relay and was not a plant installed piece of equipment. The relay protects against an instantaneous over current condition, which if undetected would cause substantial damage to the motor. This type of relay is installed in many locations; the failed relay was reserved to replace an existing relay protecting a Residual Heat Removal System pump motor. If the relay had been installed and required actuation during an accident, it would have resulted in major degradation in safety related equipment. The ABB 50H relays are installed in ten locations at PINGP. All of the 50H relays are installed on the Unit 2 safety-related buses. The equipment protected is 21 Aux Feedwater Pump, 21 Component Cooling Pump, 21 Residual Heat Removal Pump, 21 Safety Injection Pump, 21 Containment Spray Pump, 22 Safety Injection Pump, 22 Residual Heat Removal Pump, 22 Component Cooling Pump, 22 Containment Spray Pump, and 121 Cooling Water Pump. The failed relay was reserved to replace an existing relay protecting a Residual Heat Removal pump motor. PINGP Material Management has custody of the failed relay pending further investigation and notified the supplier of this notification by email on 8/6/2015. Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees: Continue bench testing relays prior to installation. |
| Where | |
|---|---|
| Abb Power T&D Company, Inc Welch, Minnesota (NRC Region 3) | |
| License number: | DPR-42 & DPR- |
| Organization: | Xcel Energy |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1236.78 h51.533 days <br />7.362 weeks <br />1.694 months <br />) | |
| Opened: | Scott Sharp 17:47 Aug 6, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Aug 6, 2015 |
| 51294 - NRC Website | |
Abb Power T&D Company, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 512942015-06-16T05:00:00016 June 2015 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Abb 50H Instantaneous Over Current Protection Relay Failure 2015-06-16T05:00:00 | |