ML20134H463
| ML20134H463 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 08/06/1985 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| AECM-8-0232, AECM-8-232, NUDOCS 8508280426 | |
| Download: ML20134H463 (2) | |
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NUCLEAR LICENSING & SAFETY DEPARTMENT U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 Attention:
Dr. J. Nelson Grace, Regional Administrator
Dear Dr. Grace:
SUBJECT:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416" License No. NPF-29 File: 0260/L-835.0 HFCS Diesel Generator 13, Generator Failure AECM-85/0232 On July 13, 1985, at 0315 while maintenance technicians were performing "HPCS Diesel Generator 13 Functional Test", 06-OP-1P81-M-0002, HPCS Diesel Generator 13 was stopped by the operator when sparks were observed coming from the generator bearing end cap.
Inspections revealed radial movement of the shaft end had allowed contact between the shaft and bearing end cap. This allowed circulating currents to be established with resultant sparks and overheating.
Close inspection revealed a low spot in the insulation under the bearing inner race which allowed excessive radial movement of the shaft. The diesel generator was declared inoperable and the damaged generator was replaced.
The damaged generator will be shipped to the vendor repair facility for further inspections and tests. This will aid in determining whether the ultimate cause of failure could be attributed to a generic problem and of interest to other facilities.
If the failure is determined to be generic in nature, a supplemental report will be issued.
The diesel generator was out of service for 9.5 days. The July 13th diesel start was successful and was intentionally terminated without loading; therefore, this is considered an invalid failure and the surveillance test interval remains at 14 days in accordance with the test schedule of Regulatory 8508280426 850006 PDR ADOCK 05000416 PDR S
J14AECM85072602 - 1 Member Middle South Utilities System 1s n i
AECM-85/0232 Page 2 o
- Position C.2.d of Regulatory Guide 1.108.
This report is submitted pursuant to Technical. Specification 4.8.1.1.3.
Yours truly, J ///%
L. F. Dale Director 7
JRM/EBS/SHH: dam-cc:
Mr. J. B. Richard Mr. O. D. Kingsley, Jr.
Mr. R. B. McGehee Mr. N. S. Reynolds Mr. H. L. Thomas Mr. R. C. Butcher Mr. James M. Taylor, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.
20555
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J14AECM85072602 - 2
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