ENS 55531
ENS Event | |
|---|---|
16:00 Aug 20, 2021 | |
| Title | Part 21 - Pressure Regulator Valve Failure |
| Event Description | The following is a summary of the report provided by Engine Systems Inc.:
The vendor supplied information to the NRC involving a defect and/or failure related to a pressure regulator valve installed on an emergency diesel generator at Brunswick Nuclear Power Plant. The valve did not properly regulate starting air pressure and allowed equalization of inlet pressure to outlet. Subsequent investigation by the vendor revealed a raised edge on the metal seating surface of the valve that caused the PTFE (Teflon) seat to tear. Equalization of starting air pressure is undesirable since it may inhibit operation of the downstream starting air solenoid valve, thus compromising the ability of the emergency diesel generator to start and support safety-related loads. The evaluation is complete. This Part 21 applies only to valves in the Brunswick Nuclear Power Plant. Corrective Actions: Brunswick continues to monitor the outlet pressure from the regulator and verify the inlet and outlet pressures have not equalized. The vendor also recommends that existing regulators have an inspection performed on-site and at the vendor. The vendor will add inspections to the dedication package for new and refurbished pressure regulator valves to verify a smooth, rounded transition at the valve seat of the throttling sleeve. Technical questions concerning this notification can be directed to Dan Roberts, Quality Manager, and John Kriesel, Engineering Manager. |
| Where | |
|---|---|
| Engine Systems, Inc Rocky Mount, North Carolina (NRC Region 2) | |
| Organization: | Engine Systems, Inc |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1416.3 h59.013 days <br />8.43 weeks <br />1.94 months <br />) | |
| Opened: | Dan Roberts 16:18 Oct 18, 2021 |
| NRC Officer: | Brian P. Smith |
| Last Updated: | Oct 18, 2021 |
| 55531 - NRC Website | |
Engine Systems, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 579882025-08-27T04:00:00027 August 2025 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Power Driven Potentiometer with Loose Relay Sockets ENS 565382023-03-28T04:00:00028 March 2023 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Defect Identified in Emergency Diesel Generator Governor ENS 556052021-11-09T17:00:0009 November 2021 17:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Hinge Pin Retainer Plug Defective on Diesel Check Valve ENS 555312021-08-20T16:00:00020 August 2021 16:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Pressure Regulator Valve Failure ENS 553472021-05-11T16:00:00011 May 2021 16:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Initial Report - Deviation Identified Loose Zinc Anodes Installed in Heat Exchangers for Diesel Generators ENS 544672020-01-08T05:00:0008 January 2020 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Inadequate Selenium Surge Suppressor Thread Modification ENS 543502019-09-06T04:00:0006 September 2019 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Emd Fuel Injectors Seized Plunger and Bushing ENS 542362019-08-22T04:00:00022 August 2019 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Cracked Spray Tip on Emd Fuel Injector ENS 537632018-11-30T05:00:00030 November 2018 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect En Revision Imported Date 12/24/2018 ENS 536002018-07-19T04:00:00019 July 2018 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Motor Operated Potentiometer Defect ENS 533022018-02-01T04:00:0001 February 2018 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Refurbished Pressure Regulator May Result in Emergency Diesel Generator Failure to Start ENS 527982017-06-08T04:00:0008 June 2017 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Defective Motor Operated Potentiometer ENS 524662016-12-21T05:00:00021 December 2016 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Issues Identified with the Enterprise Diesel Engine Subcover ENS 524772016-11-12T05:00:00012 November 2016 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Seizure of Fuel Injector on Emergency Diesel Generator ENS 511292015-06-05T22:12:0005 June 2015 22:12:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Incorrect Part Number Relay Shipped to Brunswick Nuclear Plant ENS 489602013-04-19T04:00:00019 April 2013 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Esi Refurbished Emergency Diesel Generator Cylinder Heads May Have Valve Keeper Seals Missing ENS 485642012-12-06T05:00:0006 December 2012 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Esi Refurbished Emergency Diesel Generator Cylinder Head with Foreign Material in Intake Port 2025-08-27T04:00:00 | |