ENS 55807: Difference between revisions

v t e 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.

ENS 55807 +/-
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
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.]

@@ Line 23: / Line 23: @@
 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.
-| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20220405en.html#en55807
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20220406en.html#en55807
 }}
 {{ENS-Nav}}

ENS 55807: Difference between revisions

Revision as of 06:30, 6 April 2022

Navigation menu

ENS 55807: Difference between revisions

Revision as of 06:30, 6 April 2022

Navigation menu

Search