ML19261F280

Abnormal Occurrence 50-289/74-19:on 741017,1C Makeup Pump Failed to Start During Engineered Safeguards Actuation Sys Test.Caused by Dislodged Tripping Latch Spring in Breaker. Breaker Replaced.Further Investigations Under Way

ML19261F280
Person / Time
Site:	Three Mile Island
Issue date:	10/25/1974
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
GQL-0426, GQL-426, NUDOCS 7910250722
Download: ML19261F280 (4)

Text

AEC DISTRIBUTION FOR PART 50 DOCKET MATERIAL, (TEMPORARY FORM)

CONTROL NO: 11166 _

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F ROM: Metropolitan Liison Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER

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10-25-74 10-31-74 nx TO: ORIG CC OTHER SENT AEC POR nxxxnnn Lirectorate of Licensing 1-signed SENT LOCAL PDR vv--vvv -

CL' ASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

xx:=xxxx 1 50-289 DESCRIPTION: ENCLOSUR ES:

Ltr Reporting Abnormal Occurrence 74-19 on 10-17-74 regarding Failure of the r,0_.,'..,,ED3ED' L

1C Makeup Pump to start during an ESAS .

Test......

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me su Director e 4 4,.9 /q Directorate of Licenisng ?N ,

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,s U. S. Atomic Energy Cocaission ,, s' Washington, D. C. 20545 6 , ,, y I.G.. '

Dear Sir:

Docket No. 50-289 Operating License DPR-50 In accordance with the Technical Specifications for our Three Mile Island Nuclear S tation, Unit 1, we are reporting the following Abnormal Occur-(1) Report Number: A0 50-289/74-19

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(2a) Report Date: Octob er 25, 1974 /~

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'OCT (2b) Occurrence Dauc: October 17, 1974 2 874 h~((

C y (3) Facility : Three Mile Island Nuclear S tation, Unit 1 '\ , , C . .. .. .I

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'.'i- cx (4) Identification of Occurrence: ,g7 Ti tle : Failure of the 1C Makeup Pump to Start during an ESAS Test Type: An Abnormal Occurrence as defined by tha. Technical Specifi-cations , paragraph 1.8d, in that the failure of the 1C Makeup Pump to start threatened to cause an Engineered Safeguards feature or system to be incapable of performing its intended function.

(5) Conditions Prior to Occurrence: The reactor was at s teady state power with major plant parameters as follows:

Power: Core: 100%

0 Elec.: 863 MW (Grass) }Mk RC Flow: 142 x 106 lbs /hr

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' Directorate of Licensing OCT 2 5 E74 RC Pressure: 2155 psig RC Temp . : 579 F PRZR Level: 240 in.

PR2R Temp.: 650 F (6) Description of Occurrence:

At 1209 hours0.014 days <br />0.336 hours <br />0.002 weeks <br />4.600245e-4 months <br /> on October 17, 1974, during performance of the High Pressure and Low Pressure Injection Logic Channel and Component Test on the Engineered Safeguards Actuation System (ESAS) , Makeup Pump 1C failed to start. The pump motor had started properly on two previous " auto" actuation attempts , but failed to start on the third.

(7) Designation of Apparent Cause of Occu"rence:

The apparent cause of the occurrence has been determined to be com-ponent failure, in that the breaker's tripping latch spring had become dislodged from its normal position which prevented the breaker from being able to be closed, and the pump motor would not start.

(8) Analysis of Occurrence:

It is believed that the failure of the 1C Makeup Pump to starc did not endanger either the health or safety of the public in that only one Makeup Pump is needed to supply emergency coolant to the reactor during a Loss of Coolant Accident. in the present case , the 1B Makeup Pump was already operating and the LA Makeup Pump was selected for ESAS actuation.

(9) Corrective Action:

I= mediate corrective action was taken to verify operability of the 1A and 1B Makeup Pumps, and appropriate actions were taken to replace the 1C Makeup Pump breaker with a spare breaker. The pump was then successfully started on both manual and automatic actuation signals.

As a further corrective action, the remaining 4KV ES breakers were also inspected to insure that the latch springs were in the proper position.

At a meeting held af ter the occurrence, the Plant Operations Review Committee (PORC) reviewed and gave its approval of these actions , and recommended as long-term corrective actions that the af fected breaker be further inspected and tested to more closely identify the cause of the failure and that the results of this inspection be applied to the maintenance of the remaining ESAS breakers . -

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Directorate of Licensing '

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The Station Superintendent eencurred with PORC's recommendations and has taken appropriate s teps to insure their implementation.

(10) Failure Data:

a. Previous Failure; Not Applicable,

b. Equipment Identification Westinghouse Air Circuit Breaker 50 DH-P 350 Style: 25Y4440B1 Amps: 1200 Rated KV: 4.16 Mech: FAB SPRG Sincerely, 0 f i I l i/tt 4' _

R. C. Arn61d Vice President RCA:JFV:sh cc: Mr. J . P . O 'Reilly Directorate of Regulatory Operations, Region 1 U. S. Atomic Energy Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 File 7.7.3.5.1 20.1.1 1481 312