ML20215K696

Ro:On 860911,valid Failure of Div 3 Diesel Genarator Occurred While Performing Tech Spec Surveillance 4.8.1.1.2. Caused by Governor Limit Switch Assembly Failing to Properly Set.Switch Replaced

ML20215K696
Person / Time
Site:	Perry
Issue date:	10/20/1986
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
PY-CEI-OIE-0251, PY-CEI-OIE-251, NUDOCS 8610280263
Download: ML20215K696 (2)

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/) /n #3 THE CLEVELAND ELECTRIC ILLUMIN ATING COMP ANY P.O. box 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLDG - 55 PUBL!CSOUARE Serving The Best Location in the Nation MURRAY R. EDELMAN 10RITY EUTI!;G SR VCE PRESCENT NUCLE A R g UTI.d_'

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l:. 3 Mr. James G. Keppler FILE Nt3 Director, Region 111 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Glen Ellyn, IL 60137 Perry Nuclear Power Plant Docket No. 50-440 Special Report - Valid Test Failure Division 3 Diesel Generator

Dear Mr. Keppler:

Attached is a Special Report concerning a valid test failure of the Division 3 diesel generator. This report satisfies the conditions of Technical Specifications 4.8.1.1.2 and 6.9.2.

Please feel free to contact me should you have any further questions.

Ver trul our ,

Murray R. Edelman Senior Vice President Nuclear Group MRE: lap Attachment ec: Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Jay Silberg, Esq.

John Stefano (2)

K. Connaughton Document Control Desk (USNRC) paho2Sd5! Belojho oc122 3986 S

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f<3 SPECIAL REPORT

• Division 3 Diesel Generator Valid Failure On September 11, 1986, a valid failure of the Division 3 Diesel Generator-occurred while performing Technical Specification Surveillance 4.8.1.1.2. This was the first valid failure to occur on the Perry Unit 1, Division 3 Diesel Generator. As of September 21, 1986, the Division 3 Diesel Generator had undergone five valid tests, including this one valid failure.

The failure occurred while the Division 3 Diesel Generator was accelerating to rated speed and voltage. During the test, the governor pre position limit switch assembly (Micro Switch Part No. 11SM3-T) failed to properly reset the governor speed setting motor. Fourteen seconds into the test, the generator frequency was 61.3 Hz. Technical Specifications require that frequency be stablilized and maintained between 58.8 - 61.2 Hz at 13 seconds. The Division 3 Diesel Generator returned to a stable 61.04 Hz and was successfully loaded to 100% load for greater than I hour. To correct the malfunction the pre position limit switch assembly was replaced and its associated cams re-adjusted. The Division 3 Diesel Generator was restarted _and verified operable by performing the Division 3 Diesel Generator Start and Load Surveillance Test.

The Division 3 Diesel Generator was declared inoperable on September 21, 1986 at 2015, and subsequently declared operable on September 23, 1986 at 1330 for a total out-of-service time of I day, 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br />, and 15 minutes.

The surveillance testing interval will remain at once every 31 days in accordance with Technical Specification Table 4.8.1.1.2-1.

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