ENS Event | |
|---|---|
05:00 Dec 6, 2018 | |
| Title | Part 21 - Potential Defect in Vikers Voltage Regulator System |
| Event Description | The following summary was provided in the Part 21 report:
ESI [Engine Systems Inc.] was notified on December 6, 2018 of a potential issue with saturable reactors (also referred to as magnetic amplifiers) supplied to Monticello Nuclear Generating Plant. ESI provided the reactors as like-for-like replacements for the existing magnetics of the original Vickers voltage regulator and static exciter. During system testing performed by Monticello at another vendor facility, issues with the static excitation system were identified which prevented proper control of the generator field current. Troubleshooting identified several potential causes and ESI believes there may be a potential deficiency in the saturable reactor, P/N 8408218-ESI. This component is integral to operability of the Vickers style voltage regulator and static exciter systems used on many emergency diesel generator sets in the nuclear industry. A deficiency in the reactor would adversely affect the ability to control generator output voltage and therefore adversely affect emergency diesel generator set performance. ESI is in the process of performing additional testing and analysis at the transformer manufacturer's facility to determine if a deficiency exists in this component. ESI is unable to complete an evaluation within the 60-day requirement. ESI has supplied the part to NRC licensees but, to ESI's knowledge, none of the components have been installed. ESI is notifying each customer and advising not to install the reactors until the evaluation is complete. This Part 21 Report affects the following licensees: Surry Power Station Turkey Point Nuclear Generating Station Monticello Nuclear Generating Station Point of Contact: Dan Roberts Telephone: 525-977-2720 Fax: 252-446-1134 175 Freight Road, Rocky Mount, NC 27804 |
| Where | |
|---|---|
| Engine Systems, Inc Rocky Mount, North Carolina (NRC Region 1) | |
| Organization: | Engine Systems, Inc |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+1188.25 h49.51 days <br />7.073 weeks <br />1.628 months <br />) | |
| Opened: | Dan Roberts 17:15 Jan 24, 2019 |
| NRC Officer: | Jeffrey Whited |
| Last Updated: | Jan 24, 2019 |
| 53846 - NRC Website | |
Engine Systems, Inc with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 538462018-12-06T05:00:0006 December 2018 05:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component En Revision Imported Date 3/22/2019 ENS 531512017-11-22T05:00:00022 November 2017 05:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Defect in Thermostatic Valve Assemblies 2018-12-06T05:00:00 | |