ML20127N211
| ML20127N211 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/14/1985 |
| From: | Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0765A, F765A, SD-78, NUDOCS 8507010472 | |
| Download: ML20127N211 (2) | |
Text
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k f J [ U $[E.,*[5~.'l (203) 665-5000 June 14,1985 Docket No. 50-423 F0765A Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Reference:
- 3. F. Opeka to T. E. Murley, F0733A, dated May 1,1985.
Dear Dr. Murley:
Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Accordance with 10CFR50.55(c):
Emergency Diesel Generator Fuel Oil Injection Pump Failures (SD-78)
In an April 1,1985 telephone conversation between your Mr. T. Rebelowski and our Mr. B. Kaufman, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 in accordance with 10CFR50.55(e).
The potential significant deficiency involved multiple failures of the fuel oil injection pumps on both emergency diesel generators supplied by Colt-Pleistick.
The failures appear to be due to the accumulation of foreign matter within the fuel oil header, jumpers or the fuel oil day tanks.
Due the results of our investigation and safety implications, we consider this to be a significant deficiency in the final design of Millstone Unit No. 3.
Analysis of Safety implications Af ter initial failures the day tank on "A" diesel was drained and cleaned. Fuel headers were flushed at that time and presence of any foreign matter was attributed to warped filter plates on the duplex fuel filter discovered during the initial flushing stage. A change was also made to the suction line off the day tank to increase the height in the tank where suction is taken rather than draw directly from the bottom of the tank. An examination of the duplex fuel filters was conducted. In particular, the filter housing outlet lines (clean side) were examined and found to contain small amounts of black, gritty material.
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-o The potential failure causes, if lef t uncorrected, could result in both engines continuing to experience injector failures (resulting in a decrease in full load engine capability).
Corrective Action it is felt that the problems with the injectors relate primarily to fuel filter effectiveness. Due to the problems experienced with the duplex filters, new duplex filter assemblies have been procured and installed.
Under Colt's direction, the skid-mounted fuel oil headers and supply piping have been flushed.
As such, we consider this to be our final report for SD-78. We trust the above information satisfactorily responds to your concerns.
This response is submitted af ter the committed response date and this postponement has been discussed with the resident inspector.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY
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J.F.Opekd U
Senior Vice President cc:
Mr. J. M. Taylor, Director Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555