ENS 53302
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ENS Event | |
|---|---|
04:00 Feb 1, 2018 | |
| Title | Part 21 - Refurbished Pressure Regulator May Result in Emergency Diesel Generator Failure to Start |
| Event Description | The following report is an excerpt from a fax from Engine Systems, Inc.:
ESI [Engine Systems, Inc.] supplied a refurbished pressure regulator assembly, P/N 1776 506, S/N 20776487, to Brunswick Nuclear Plant in August 2017. ESI later determined that two components of the assembly, an upper and lower diaphragm plate, were omitted during reassembly of the refurbished regulator. Reference item 8 on Figure 1 for location of the diaphragm plates within the pilot valve portion of the regulator assembly. These metal diaphragm plates distribute load and retain the associated rubber diaphragm. Omission of the metal plate may not initially affect operation of the pilot valve and therefore may not be detected during functional testing; however over repeated cycles there is a strong possibility that the rubber diaphragm would tear or rupture without the benefit of load distribution and support provided by the metal diaphragm plate. The regulator assembly is used in the safety-related air start system of the emergency diesel generators (EDGs) at Brunswick Nuclear Plant. Failure of the regulator to function properly due to the omission of a component within the pilot valve portion of the assembly could adversely affect the starting capability of the EDG. Since the EDG is a safety system used to ensure the safe shutdown of the nuclear reactor, this issue is considered to be a reportable defect as defined by 10CFR21. |
| Where | |
|---|---|
| Engine Systems, Inc Rocky Mount, North Carolina (NRC Region 1) | |
| Organization: | Engine Systems, Inc |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1380.83 h57.535 days <br />8.219 weeks <br />1.891 months <br />) | |
| Opened: | Dan Roberts 15:50 Mar 30, 2018 |
| NRC Officer: | Thomas Kendzia |
| Last Updated: | Mar 30, 2018 |
| 53302 - NRC Website | |
Engine Systems, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 565382023-03-28T04:00:00028 March 2023 04:00:00
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