ENS 55807
ENS Event | |
|---|---|
04:00 Jan 27, 2022 | |
| Title | Part 21 - ELECTRO-MOTIVE Diesel (Emd) Cylinder Head with Fireface Thickness Below Specification |
| Event Description | The following is a summary of the information provided by Engine Systems, Inc. (ESI) via fax:
ESI reported that a fatigue crack was discovered in the fireface of an EMD cylinder head, P/N 40121485, D/C 18K, installed on an emergency diesel generator set. The crack initiated on the coolant side and propagated through the fireface wall of the combustion side resulting in a water leak. Fatigue failure was likely caused by a reduced fireface thickness which reduced overall rigidity of the fireface, allowing increased deformation and ultimately failure due to high tensile stress at the blend between the fireface and valve seat. A reduced fireface thickness could result in a through wall crack that would introduce jacket water into the combustion chamber. Over time if the crack propagated or went undetected engine damage may occur. Ultimately, a crack in the fireface could lead to a failure of the diesel engine which would prevent the emergency diesel generator set from performing during a safety-event. This Part 21 applies to the Cylinder heads from D/C 18K, supplied within some power pack assemblies at Watts Bar Nuclear Power Plant. Corrective Actions: ESI recommends an ultrasonic thickness inspection on the fireface to confirm thickness is within specified range to plants with these power pack assemblies. ESI has also revised its dedication package to increase the number of ultrasonic thickness inspection points. An additional enhancement is the inclusion of an inspection map for guidance and clarity of the locations to be measured. The revision was implemented on March 15, 2022. Technical questions concerning this notification can be directed to Dan Roberts, Quality Manager and John Kriesel, Engineering Manager at (252) 977-2720. |
| 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:+1477.63 h61.568 days <br />8.795 weeks <br />2.024 months <br />) | |
| Opened: | Dan Roberts 16:38 Mar 29, 2022 |
| NRC Officer: | Karen Cotton-Gross |
| Last Updated: | Mar 29, 2022 |
| 55807 - NRC Website | |
Engine Systems, Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 569132023-11-27T05:00:00027 November 2023 05:00:00
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