ML20138K672
| ML20138K672 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/18/1985 |
| From: | Fee W, Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0846A, F846A, SD-86, NUDOCS 8510300271 | |
| Download: ML20138K672 (2) | |
Text
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.o.,4.s, uca., r c.ov co October 18,1985 Docket No. 50-423 F0846A Dr. Thomas E. Murley Regional Administrator U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Reference:
(1)
- 3. F. Opeka letter to T. E. Murley, F0831 A, dated September 6,1985.
Dear Dr. Murley:
Millstone Nuclear Power Station, Unit'No. 3 Reporting of Potential Significant Deficiencies in Accordance with 10CFR50.55(e):
Differential Relays GE Type PVD21 (SD-86)
In an August 8,1985 telephone conversation between your Mr. T. Rebelowski and our Mr. R. 3. Young, 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 the General Electric Type PVD21 Differential Relays located in the Class IE 4160 volt switchgear. Mechanical impacts to the switchgear doors containing the PVD21 relays have caused tripping of the switchgear circuit breakers.
Reference (1) stated that a retest of the PVD21 relays would be [.erformed to verify the seismic qualification. The retest was performed on September 13,14,
& 16, 1985. Discussions with General Electric confirmed that the re'ays exceed the seismic requirements for the 4160 volt Class IE switchgear.
8510300271 851018 PDR ADOCK 05000423 S
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. v. 5 NNECO considers the seismic qualification issue of the relays resolved, and this to be our final report for SD-86.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY a
4.E. Opeka
/
Senior Vice President W
By: W. F. Fee Executive Vice President cc:. Mr. 3. M. Taylor, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555