ML20199D084
| ML20199D084 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/06/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-86-234-000 PT21-86-234, PT21-86-234-000, NUDOCS 8606190253 | |
| Download: ML20199D084 (2) | |
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DUKE POWER GOMPANY P.O. H O X s'M318 0 CHAHLOTTE, N.O. 28242 HALH. TUCKER TELEPHONE
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June 6, 1986 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Conunission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re:
Catawba Nuclear Station, Unit 2 Docket No. 50-414
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 2A which occurred on May 9, 1986.
Very truly yours, s
1/
Hal B. Tucker RWO: sib Attachment ec: Director Oft' ice of Inspection and Enforcement U. S. Nuclear Regulatory Connaission Washington, D. C.
20555 NRC Resident Inspector Catawba Nuclear Station 86061902S3 860606 PDR ADOCK 05000414 S
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f SPECIAL REPORT i
Diesel Generator 2A Valid Failure on 05-09-86 l
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 Diesel Generator (D/G) 2A on May 9,'
1986. This valid failure was the sixth failure within the last 45 valid tests for the Unit 2.
Please note that as of May 9, 1986, the 2A and 2B D/Gs had only completed 45 valid tests (this includes six failures).
During the performance of procedure PT/2/A/4350/02C (Available Power Source l
Operability Verification), D/G 2A failed to start. This was caused by the fuel racks not opening. The suspected cause of the failure was that the governor l
booster cylinder did not build adequate hydraulic presoure in the governor to open the fuel racks. To correct the problem, the stroke on the governor booster cylinder was subsequently increased, thus increasing governor hydraulic pressure to open the fuel racks. D/G 2A was started and verified operable by performing procedure PT/2/A/4350/02A (D/G 2A Operability).
D/G 2A was declared inoperable on May 9, 1986 at 2140 hours0.0248 days <br />0.594 hours <br />0.00354 weeks <br />8.1427e-4 months <br /> and was subsequently declared operable on May 10, 1986 at 0615 hours0.00712 days <br />0.171 hours <br />0.00102 weeks <br />2.340075e-4 months <br />. Therefore, D/G 2A was out of service 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and 35 minutes. At this time the surveillance testing interval is 3 days which is in accordance with Section C.2.d.4 of Regulatory Guide 1.108 Revision 1 (Periodic Testing of Diesel Generator Units i
Used as Dr. site Electrical Power Systems at Nuclear Power Plahts).
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