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Ro:On 710902,breaker Failure Relay Operation on 27R8 Air Blast Breaker Tripped Breakers 29H9 & 25R8 Resulting in Loss of Power to Startup Transformers.Caused by Faulty Breaker Failure Relay on 27R8 Breaker.Review of Wiring in Progress
	ML20084S537
Person / Time
Site:	Palisades
Issue date:	09/09/1971
From:	Haueter R; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Morris P; US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084S508	List: ML20084S506; ML20084S537;
References
	NUDOCS 8306170095
	Download: ML20084S537 (4)
	v • d • e

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O O ConSumeIS Power Vj@ Company h @ ]D d Q./ J U o n ..i omc..: ai2 w..i u.c~o-n 4.eno.. .>.ca.on. u.c ~a.n o20i Are coa. si7 7se-osso September 9, 1971 Dr. Peter A. Morris, Director Re: Docket No 50-255 Division of Reactor Licensing License No DPR-20 US Atomic Energy Comission Washington, DC 20545

Dear Dr. Mcrris:

This letter is written to apprise you of a recent incident involving the emergency power supply at this facility.

At the time the incident occurred, the plant was in a cold shutdown condition with primary coolant system at refueling boron concentration and atmospheric pressure. The shutdown cooling system was in operation.

The 345 kV Argenta No 2 line tripped at 0706 on September 2, 1971. A breaker failure relay operation on the 2TR8 air blast breaker tripped breakers 29H9 and 25R8, clearing the 'R' 345 kV. bus and resulting in the loss of power to the start-up transformers.

(Refer to attached Drawing E-501.) The main bank has not been routinely energized during the current low power operation resulting in a single source of off site power.

The emergency diesel generators both started and quickly achieved rated speed with the 1-1 unit properly closing in on the dead 2400 V bus and picking up load as designed. (Refer to attached Drawing E-1.) However, the 1-2 diesel generator unit failed to close in on the dead bus automatically until the operator turned the synchroscope plug in preparation for closing the breaker manually.

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. Dr. Peter A. Morris 9 2 US Atomic Energy Comission September 9, 1971 CAUSE OF INCIDENP The cause of the loss of power to the station was determined to be a faulty breaker failure relay on the 2TR8 breaker which caused the 'R' bus to be isolated. The exact cause of the diesel generator failure to close automatically on the dead bus is still under investi-gation at this time.

CORRECTIVE ACTION PLANNED A review of the wiring scheme and actual installation is in progress to determine the exact mode of failure. Test operation under simulated loss of offsite power will be conducted to determine anydeficiencyand/ordemonstratetheoperabilityofthecomplete system.

Yours very truly,

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IRH/ERC/mho Robert L. Haueter Electric Production Superintendent - Nuclear CC: BHGrier USAEC Compliance, COO

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b, f REGION lli t / 4rg, og 799 ROOSEVELT ROAD 7,Lg,gggg GLEN ELLYN, ILLINolS 60137 utz) asa-asso September 2, 1971 J. G. Keppler, Chief, Reactor Testing and Operations Branch Division of Compliance, Headquarters CONSUMERS POWER COMPANY LICENSE NOS. DPR-190AND DPR-20 BIG ROCK POINT AND PALISADES TERMINATION OF STRIKE he attached inquiry report documents the termination of a strike against Consumers Power Company which began on May 12, 1971.

We Big Rock Point facility is operating at about 707. of rated power.

The Palisades facility is shut down with plans for intermittent operation within the provisional 1 Mwt license for training purposes.

No further action is planned.

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h)l 't CO:III:KVS Gasto Fiorelli Senior Reactor Inspector I

Attachment:

CO Inquiry Rpt Nos. 050-155/71 10 and 050-255/71-11 (orig & 1)

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9 o U. S. ATOMIC ENERGY COMMISSION DIVISION OF COMPLIANCE

! REGION III CO Inquiry Report Nos. 050-155/71-10 and 050-255/71-11 1

Subject:

Consumers Power Company

, License Nos. DPR-M[and DPR-20 Big Rock Point and Palisades Termination of Strike QN' !d'!jUfw Prepared By: II. C. Dance September 1, 1971 A. Date and Manner AEC was Informed:

Mr. C. Hartman, Big Rock Point Plant Superintendent, informed Region >

I III by telephone on September 1, 1971. Subsequent discussion was held the same date with Mr. R. Haueter in Jackson, Michigan.

1 B. Description of Particular Event or Circumstance:

Operating and maintenance personnel and members of the Utility Workers

,' Union of America began returning to work at 12:01 a.m. on September 1, 1971, by direction of their national union. We strike began ca 1

May 12, 1971. Plant operation during the strike had been conducted

{ by supervisory and engineering personnel, he union members will vote on Consumers Power Company's last proposal within~the next thirty days.

J C. Action by Licensee:

None required. ..

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ML20084S537

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