ML20094K125

Ro:On 920212,diesel Generator 1A Failed to Attain Rated Speed & Voltage within 10 & Declared Inoperable.Caused by Air Leak in Air Control Sys Which Positions Fuel Racks in Full Fuel Position.Test Frequency Increased

ML20094K125
Person / Time
Site:	Braidwood
Issue date:	03/11/1992
From:	Simpkin T COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9203190090
Download: ML20094K125 (2)

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.7 Mr. A. Bert Davis fRLk:

Regional Administrator U.S. Nuclear Regulatory Commission Region ill 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Braldwood Station Unit 1 Diesel Generator 1DG01KA Failure NBC DocheLNom50-45S Reference; (a)

(b) March 4,1992, T.W. Simpkin letterNUREG-1276, Technical to A.B. Davis

Dear Mr. Davis:

Section 4.8.1.1.3 of reference (a) requires that all diesel generater failures, ,

valid or non valid, be repor1ed to the NRC pursuant to Specification 6.9.2. The enclosure provides the report that addresses one valid failure of the 1DG01KA diesel generator. The criteria used to determine valid tests and failures is taken from section C.2.e of Regulatory Guide 1,108.

Reference (b) is the most recent report addressing diesel generator failures, t

submitted per Section 4.8.1.1.3.

Please direct any questions concerning this submittal to this office.

Very truly yours, Q ,bwe N T.'W. Simpkin Nuclear Licensing Administrator cc: R. Pulsifer NRR B. Clayton - Rill Resident inspector - Braidwood NRC Document Control Desk IMR 131992 -ff .

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Eebruary_12J992 I On Wednesday, February 12,1992 at 0753 hours0.00872 days <br />0.209 hours <br />0.00125 weeks <br />2.865165e-4 months <br />, the Braidwood Unit 1. Train A II A) Diesel Generator (DG) was staried in accordance with Braldwoo Unit 1 Oprating Surveillance Proceduto (18wOS) 8.1.1.2.a 1 Unit L 11 A Diesel Generator Operability Monthly j (Staggered) and Semi Annual (Staggered) Surveillance, for a monthly 1 operability run. The 1 A DG failed to attain rated speed and voltage within 10 seconds as required by Technical Specification (TS) 4.8.1.1.2.a.4.

The 1 A DG was declared inoperable and the applicable TS 3.8.1.1 Limiting Condition for Operation Action Requirements (LCOARs) were entered, Subsequent troubleshooting revealed an air leak in the air control system which xsitions the fuel racks into the " full fuel

• position when a start signal s initiated. The air leak was repaired. A )

post maintenance verification run was performed which resulted in the 1 A DG attaining rated speed and voltage in 8.8 seconds as measured by a j stopwatch and 8.0 seconds as measured by a strip chart recorder.

At 1450 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.51725e-4 months <br /> the 1 A DG was started in accordance with 1BwOS 8,1.1.2.a 1 for an operability run. The 1 A DG attained rated speed and voltage in 7.27 seconds as measured by a stopwatch and 7.35 seconds as measured by a strip chart recorder. the remainder of the aurveillance was completed without incident. At 1845 hours0.0214 days <br />0.513 hours <br />0.00305 weeks <br />7.020225e-4 months <br />, the 1 A DG was declared operable and all applicable TS 3.8.1.1 LCOARs were terminated.

This failure of the 1 A DG was determined to be a valid failure in accordance with Regulatory Guide 1.108 Section C.2.e. This failure puts the 1 A DG on an increased test frequency schedule of at least once per week until seven consecutive failure free demands have been performed and the number of failures in the last twenty valid demands is reduced to one or less.

As of February 28,1992, the 1 A DG has had two valid failures and the Braldwood Unit 1 Train B (IB) DG has had three valid falvres in the last one hundred Braidwood Unit 1 DG demands.

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