ML20107K878
| ML20107K878 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/26/1984 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-84, REF-PT21-85-038-000 (RDC-117-(84)), PT21-85-038-000, PT21-85-38, NUDOCS 8411130314 | |
| Download: ML20107K878 (2) | |
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f THE CLEVELAND ELECTRIC ILLUIdIN ATING C0MPANY P.O. BOX 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLOG. - 55 PUBLICSOUARE Serving The Best Location in the Nation MURRAY R. EDELMAN VICE PRISIDENT NUCLEAR Mr. James G. Keppler Regional Administrator, Region III Office of Inspection-and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 KE:
Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Standby Diesel Generator Voltage Regulator [RDC 117 (84)]
Dear Mr. Keppler:
This letter serves as the final report pursuant to 10CFR50.55(e) concerning a potential deficiency in Standby Diesel Generator Voltage Regulators supplied by Transamerica Delaval, Inc.
Mr. R.
Knop of your office was first notified on October 1,1984, by Mr.
E. Riley of The Cleveland Electric Illuminating Company (CEI) that this matter was being evaluated for applicability to the Perry Nuclear Power Plant (PNPP) per our Deviation Analysis Report 203.
This report contains a description of the deficiency, an analysis of the safety implication, and corrective action to be implemented.
Description of Deficiency The potential deficiency exists in the Standby Diesel Generator Voltage Regulator.
When the Diesel Generator is started, field flashing of the Generator occurs, as properly designed, for a period of less than ten seconds.
In the present configuration, however, when the Diesel Generator is tripped, the field is also flashed when the unit coasts down.
When field flashing occurs, the field flash resistors are energized.
On coast down, the field flash resistors could be energized for as long as 60 seconds.
When these resistors are energized for this extended period, excessive temperature rise could be created within the Generator Control Panel and expose components close to the field flash resistors to excessively high temperatures.
l This item was reported to the NRC on September 18, 1984, by Transamerica Delaval as a 10CFR21 notification.
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Mr. Jam 3s G. Keppler October 26, 1984 Analysis of Safety Implication Excessive temperature exposure of components close to the field flash resistors in the Generator Control Panel could result in overheating of those components which could in turn result in non-availability of the affected Standby Diesel Generator.
Corrective Action An Engineering Change Notice is being issued to implement the recommendations of the Transamerica Delaval Service Information Memo 366 for Generator Field Flashing Circuit Modification.
This modification is anticipated to be completed by December 1, 1984, for Unit 1.
Subsequent to this modification, verification that field flashing has been eliminated during coastdown, after a stop signal, will be conducted during initial checkout and run-in of the Unit 1 Standby Diesel Generator Systems.
Field Flashing Circuit Modification and subsequent verification will be completed prior to preoperational testing for Unit 2.
y Please call if there are any additional questions.
Sincerely,
$h Murray R. Edelman Vice President Nuclear Group MREspab cc:
Mr. J. A. Grobe NRC Site Office Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555 Records Center, SEE-IN Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339
.