ML20214U926
| ML20214U926 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 09/12/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8610020027 | |
| Download: ML20214U926 (2) | |
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Duxe POWER C>OMPAhT P.O. box 33180 CHARLOTTE, N.C. 28242 HALB. TUCKER TLLEPHONE (704) 373-4831 vum emesson,,
I SB SEP 25 A10 ' 3 September 12, 1986 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulstory Connaission 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 August 15, 1986.
Very truly yours, A
Hal B. Tucker RWO/27/slb Attachments xc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Connaission Washington, D. C.
20555 NRC Resident Inspector Catawba Nuclear Station 8610020027 860912 PDR ADOCK 05000413 S
PDR IE01
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e SPECIAL REPORT Diesel Generator 1B Valid Failure on August 15, 1986 As required by Technical Specification 4.8.1.1.3 and Station Directive 2.8.1 the following information concerns the valid failure which occurred on August 15, 1986 during testing of the IB Diesel Generator (D/G). This valid failure is the second valid failure within the last 100 valid tests of the Unit 1 D/G's.
On August 15, 1986 during testing of the IB D/G Load Sequencer per periodic test PT/1/A/4350/04B, the D/G tripped for no " apparent" reason as there were no alarms reflecting the. cause of the trip. Subsequent investigations revealed that the cause of the trip was failure of an 0-ring seal on the shuttle valve in the Pneumatic Safety Shutdown System. The 0-ring and an associated pressure sensor were replaced, and the system was tested to verify operability. The total time in which the IB D/G was out of service was from August 15, 1986 at 0523 to Aug st 17, 1986 at 1018.
The current testing interval is 14 days which is in accordance with section C.2.d(2) of Regulatory Guide 1.108, Periodic Testing of Diesel Generator Units used as Onsite Electric Power Systems at Nuclear Power Plants, Revision 1.
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