ML20207J285
| ML20207J285 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/15/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8701080373 | |
| Download: ML20207J285 (2) | |
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DUKE POWER GOMPANY P.O. BOK 33180 CHARLOTTE, N.O. 28242 HAL B. TUCKER rztzenosz (704) 373-4531 vnos recoment M DEC 7.9 M2 : 3 7 December 15, 1986 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re:
Catawba Nuclear Station, Unit 1 Docket No. 50-413
Dear Dr. Grace:
Pursuant to Technical Specifications 4.8.1.1.3 and 6.9.2, please find attached a Special Report concerning the valid failure of Diesel Generator 1B which occurred on November 15, 1986.
Very truly yours, Hal B. Tucker RWO/52/slb Attachments xc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 NRC Resident Inspector Catawba Nuclear Station w
J Special Report Failure of Diesel Generator (D/G) IB A valid failure of D/G 1B occurred on November 15, 1986. This failure is the fourth failure within the last 95 valid tests of the IB D/G and the second failure within the last 20 valid tests of D/G 1B.
Consequently, the current testing interval of the IB D/G is 7 days, which is in accordance with Technical Specification 3/4.8.1.1.2.
On November 15, 1986 during testing of the IB D/G a trip occurred approximately 2 i
minutes after the start. A Work Request was initiated to investigate an apparent control air problem.
Subsequent investigations revealed a control air leak at an orifice in the " low-low lube oil pressure" sensor tubing. Additionally, a shuttle valve in the Pneumatic Safety Shutdown System required cleaning. Following all necessary repairs, the D/G was successfully tested to verify operability. The total time the D/G was inoperable was 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br />, from 1000, November 15, to 0300, November 16, 1986.
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