ENS 49830

v t e ENS Event
05:00 Feb 10, 2014
Title	Part 21 Report - Failed Pressure Regulator During Post-Installation Edg Pressure Testing
Event Description	Component: Starting air pressure regulator (Nordberg P/N 1776 506). Summary: Engine Systems Inc. (ESI) began a 10CFR21 evaluation on 12/13/13 upon completion of a failure analysis performed on a pressure regulator part number 1776 506 (S/N 20776487) that was returned by Brunswick Nuclear Plant (BNP) following a failure that occurred during post-installation pressure testing on their emergency diesel generator [EDG] set. The downstream pressure would not maintain its set point and began to equalize to the inlet pressure. This evaluation was concluded on 02/10/14 and it was determined that this issue is a reportable defect as defined by 10CFR Part 21. The failure to regulate downstream pressure is attributed to an o-ring within the piston guide assembly of the pressure regulating valve that was improperly installed at the factory. Failure of the o-ring's pressure boundary allows inlet pressure to leak to the outlet pressure side eventually causing equalization to occur. This equalization is undesirable since it could lead to pressures that exceed the capabilities of the engine's downstream air start solenoid valve; thereby potentially preventing the diesel engine from starting during an emergency event and performing its safety related function.

ENS 49830 +/-
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:+107.65 h4.485 days <br />0.641 weeks <br />0.147 months <br />)
Opened:	Tom Horner 16:39 Feb 14, 2014
NRC Officer:	Steve Sandin
Last Updated:	Feb 14, 2014
49830 - NRC Website
v • d • e

v t e Emergency Notification System
Engine Systems, Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2023-05-17T04:00:00 [Table view]
[ENS list for Engine Systems, Inc.]

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