ENS 44178
ENS Event | |
|---|---|
05:00 Apr 29, 2008 | |
| Title | Part 21 Notification Regarding Identification Of Defect Alco Snubber Valve Micro-Cracking |
| Event Description | The reporting organization provided the following information via facsimile:
Name and address the individual or individuals informing the Commission. Mr. Dominic Dedolph, Manager, Quality Assurance, Fairbanks Morse Engine, 701 White Avenue, Beloit, WI 53511. Identification of the facility, the activity, or the basic component supplied for such facility or such activity within the United States which fails to comply or contains a defect: Facility- Entergy (Indian Point). Basic component which fails to comply or contains a defect: ALCO Fuel Snubber Valve P/N 2402466-1. The snubber valves in the Emergency Diesel Generator are installed in the high pressure fuel line between the fuel injection pump and the injection nozzle and serve as a pulsation dampener. Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect or failure to comply. Nature of defect: Fairbanks Morse Engine (FME) evaluation has determined that a potential safety hazard exists for ALCO fuel injection snubber valves due to micro-cracking in the tip of the snubber valve created during the material surface hardening process when the tips of the snubber valve were quenched in water. Safety hazard which could be created by such defect: Micro-cracking in the tip of the snubber valve could potentially lead to material flaking . It has been postulated that the flakes (or particles) could be flushed downstream and become lodged in the nozzle, causing excessive fuel to enter the combustion space and wash the cylinder liner dry and lead to a piston seizure. The date on which the information of such defect or failure to comply was obtained. Deviation discovered on February 29, 2008. Evaluation completed on April 28, 2008. The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action. Root cause analysis was performed and found that water quenching during the heat treatment process resulted in approximately 40% of the tips of the snubber valves to have micro-cracking present. When oil was substituted for the quenching medium, no snubber valves showed any signs of micro-cracking. The heat treatment process documentation has been updated to specify the quenching medium as oil. Oil has been used exclusively in the heat treatment process of all snubber valves produced by FME since March 1, 2008. Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees. FME is notifying Entergy (Indian Point) of the twelve (12) suspect pieces. |
| Where | |
|---|---|
| Fairbanks Morse Beloit, Wisconsin (NRC Region 3) | |
| Organization: | Fairbanks Morse |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+10.48 h0.437 days <br />0.0624 weeks <br />0.0144 months <br />) | |
| Opened: | Dominic Dedolph 15:29 Apr 29, 2008 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Apr 29, 2008 |
| 44178 - NRC Website | |
Fairbanks Morse with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 441782008-04-29T05:00:00029 April 2008 05:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Notification Regarding Identification of Defect Alco Snubber Valve Micro-Cracking 2008-04-29T05:00:00 | |