ENS 53763
ENS Event | |
|---|---|
05:00 Nov 30, 2018 | |
| Title | En Revision Imported Date 12/24/2018 |
| Event Description | EN Revision Text: PART-21 - EMERGENCY DIESEL GENERATOR EMD FUEL AND SOAKBACK PUMPS LOOSE BOLTS
The following report was received via fax: ESI [Engine Systems, Inc.] was notified by a nuclear customer of two instances where a bolt was found loose or backed out of the cover of an EMD [Electro-Motive Diesel] engine driven fuel pump P/N 8410219. Following notification, ESI inspected remaining pumps in inventory and found instances where one or more of the pump cover bolts were loose or lightly torqued. EMD fuel pump, P/N 8410219, is commonly used on all 12, 16, and 20-cylinder EMD model 645E4 and E4B engines. The pump is either mechanically driven from the engine (via the scavenging tube oil pump) or motor driven (as in the case of a backup/redundant fuel pump). The pump transfers fuel oil from the day tank to the fuel injectors to support fuel combustion. Without the supply of fuel oil, the diesel engine is unable to produce power which adversely affects the safety-related operation of the emergency diesel generator set. ESI recommends inspecting the bolts of all pumps for proper bolt tightness. Use a torque wrench and ensure all bolts are tightened to 108 to 120 in-lbs (12 to 13 Nm). This activity should be performed at the earliest opportunity; however, it is more important for the inspection to be performed on newly installed pumps. It is expected that for pumps supplied with low bolt torque, if a problem were to develop it would be in the form of a fuel leak soon after installation. For pumps that have been successfully installed for several months or years with no detectable leakage, it is less likely that bolt(s) are loose and therefore the urgency of this inspection is reduced. Points of Contact: (252) 977-2720 Dan Roberts, Quality Manager John Kriesel, Engineering Manager Affected Plants: Region 1: Nine Mile Point, Fitzpatrick Region 2: Brown's Ferry, Savannah River, Oconee, St Lucie, Surry Power Station, Turkey Point, Watts Bar Region 3: La Salle, Point Beach, Dresden, Clinton Region 4: Grand Gulf, River Bend, Energy Northwest,, Entergy Operations Inc - Arkansas, Omaha Public Power - Fort Calhoun
The following was received via fax: Revision 1 involves updates on page 2 of the 10 CFR Part 21 Report which include: In item (iv), added reference to F4B engine application. Revised Item (vii): For all affected customers: ESI recommends inspecting the bolt tightness for all pumps. The recommended bolt torque is 108 to 120 in-lbs (12 to 13 Nm). After verifying bolt torque, a shaft freeness check is recommended. The pump shaft should be capable of being rotated by hand in either direction. Due to the small shaft size, this check is commonly performed with a small crescent wrench or with the coupling half installed on the shaft. Inability to rotate by hand indicates loss of end clearance and the pump should be returned to ESI for rework or replacement. Note: For installed pumps where it is not possible to check shaft freeness, ESI recommends using a reduced bolt torque of 60 to 70 in-lbs (7 to 8 Nm). This is sufficient to ensure the bolts are snug while safeguarding against loss of end clearance that would otherwise go undetected. This activity should be performed at the earliest opportunity; however, it is more important for the inspection to be performed on newly installed pumps. It is expected that for pumps supplied with low bolt torque, if a problem were to develop it would be in the form of a fuel leak soon after installation. For pumps that have been successfully installed for several months or years with no detectable leakage, it is less likely that bolt(s) are loose and therefore the urgency of this inspection is reduced. For ESI: The dedication procedures for these pumps have been revised or are being revised to add a step to verify proper bolt torque. This will be completed prior to any future shipments. In addition, ESI is in correspondence with the pump manufacturer to implement corrective actions to prevent reoccurrence. Notified R1DO (Jackson), R2DO (Bonser), R3DO (Stone), R4DO (Alexander), and Part 21/50.55 Reactors (e-mail). |
| 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:+11.13 h0.464 days <br />0.0662 weeks <br />0.0152 months <br />) | |
| Opened: | Dan Roberts 16:08 Nov 30, 2018 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 21, 2018 |
| 53763 - NRC Website | |
Engine Systems, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 565382023-03-28T04:00:00028 March 2023 04:00:00
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