ENS 53846: Difference between revisions
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| event date = 12/06/2018 00:00 EST | | event date = 12/06/2018 00:00 EST | ||
| last update date = 03/21/2019 | | last update date = 03/21/2019 | ||
| title = | | title = Part 21 - Potential Defect in Vickers Voltage Regulator System | ||
| event text = | | event text = The following summary was provided in the Part 21 report: | ||
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. | 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. | 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. | ||
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Affected facilities still include Monticello, Turkey Point, and Surry. | Affected facilities still include Monticello, Turkey Point, and Surry. | ||
Notified R2DO (Montgomery) and R3DO (McCraw), Part 21/50.55 Reactors group via e-mail. | Notified R2DO (Montgomery) and R3DO (McCraw), Part 21/50.55 Reactors group via e-mail. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/ | | URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190124en.html#en53846 | ||
}} | }} | ||
{{ENS-Nav}} | {{ENS-Nav}} | ||
Revision as of 08:30, 1 January 2020
| 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: | Mar 21, 2019 |
| 53846 - NRC Website | |