ML20236W273

Special Rept:On 871028,following Initiation of 24 H Run for 18-month Diesel Generator Test,Emergency Diesel Generator 1B Stopped Running.No Cause for Trip Determined.Procedure Will Be Revised So Alarm Conditions Tested Before Run

ML20236W273
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	11/23/1987
From:	Taylor J DAIRYLAND POWER COOPERATIVE
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LAC-12447, NUDOCS 8712070368
Download: ML20236W273 (3)

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• 2615 EAST AVE. , 4602-0817 (608) 786-4000 SO. .

JAMES W TAYLOR G:neral Manager

November 23, 1987 In reply, please refer to LAC-12447 DOCKET NO. 50-409 Mr. A. Bert Davis,-Regional Administrator U. S. Nuclear Regulatory Commission Directorate of Regulatory Operations Region III 799 Roosevelt Road Glen Ellyn, IL .60137

SUBJECT:

Dairyland Power Cooperative La Crosse. Boiling Water Reactor (LACBWR)

Provisional Operating License No. DPR-45 Special Report IB Emergency Diesel Generator

REFERENCES:

(1) LACBWR Technical Specifications, Section 5.2.10.1.4 l (2) LACBWR Technical Specifications, Section 5.2.10.1.2.c.5 l

In accordance with Reference 1, this is to inform you of a' diesel generator test failure. Reference 2 requires that a diesel generator be' tested to operate for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. For.1B Emergency ~ Diesel Generator, the required load during this test is 1 50 kw which corresponds to the lowest' setting on the 300 kw test load resistor bank.

On October 27, 1987, the 18-month test was started on the 1B Emergency Diesel Generator. At 1610, the 24-hour run was initiated. At 0110 on October 28, the diesel stopped running.

The following alarm lights were on at the-Diesel Control Cabinet Alarm Panel: low oil pressure, high water temperature, overspeed, overvoltage, l lockout, and low battery voltage. Any one of the first four conditions can 1 trip the diesel when it is running in manual,.but.only the overspeed can trip it in auto. Under test conditions, the diesel is running in' auto. The low lube oil pressure, high water temperature, and overvo'ltage alarms had been :

placed and left in an alarm status during an earlier portion of.the test. The i overspeed alarm should not have been in'during the' test. It was concluded that the overspeed was the most likely cause of the IB Emergency Diesel

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November 23, 1987 Page 2

.The diesel was' inspected. The temperature and lube oil level were .

4 j normal.' There was adequate fuel in the day: tank.J No obvious cause for the diesel trip was noted.

A'more' detailed inspection was.performe'd by.the Operations and Instruments and Electrical Supervisor, an. electrician, the Mechanical Maintenance' . .

Supervisor and a mechanic. . The mechanical safety shutoff device was found-tripped. 0f the~ alarm conditions present,'at least overspeed'and low lube oil-pressure can trip the. device." , Everything else appeared. to be in good working :

order. There were no loose linkages on.the governor and wiring' appeared '

satisfactory.

The test. load breaker was opened,'the auto start signal reset and the control switch turned to off. The. mechanical safety shutoff device, lockout relay and alarms were reset.

. At 1000 on October 28, . the 1B Emergency Diesel Generator (EDG) was .

started. It operated satisfactorily and was shut'down at 2005. At 1010,the.

diesel was started for,the 24-hour test run and loaded with the 50 kw (nominal) resistor. Lube oil pressure, water temperature, and oil level readings were taken hourly. At 1013 on October 29, the 24-hour test was-completed with satisfactory results..

No cause for the diesel trip was determined. The IE Emergency Diesel Generator is a 400 kw Caterpillar Model D348 diesel. This is its first.

failure during the 24-hour surveillance test. The test procedure is being revised so that the alarm conditions tested during the 18-month test are.

cleared before the 24-hour run, rather than at the end of the test. This action will help in. troubleshooting any' future problems..

The reactor is permanently shut'down and defueled..,0nly one Emergency-Diesel Generator is required to be operable during Operating Condition 4, Cold Shutdown. The 1A Emergency Diesel Generator was operable at the time of the IB EDG test failure. The'18-month test on the 1A EDG.had been satisfactorily completed on October 27, 1987. The two diesels are of different designs.: '

The IB Emergency Diesel Generator failure is not considered a valid. test' or failure per the guidance in Regulatory Guide 1.108, Section C.2.e, since during this test the diesel is not loaded to at least 50% of its continuous l '. rating. Also, the diesel ran successfully.for more than-1 hour. Therefore, this failure will.not affect the diesel generator test schedule, as specified '

in Technical Specification Table' 5.2.10 1.2-1.. This conclusion was discussed

( with Mr. Ken Ridgway, LACBWR NRC Resident Inspector, who concurred.- The.

diesels are currently on a 31-day test interval, with one valid failure of the IB Emergency Diesel Generator in the last 100. valid tests.-

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