ML19262A180

Abnormal Occurrence 50-289/75-01:on 750103,1C High Pressure Injection Pump Failed to Start on Signal.Caused by Loose Termination on Circuit Breaker Release Internal Control Wiring.Circuit Breaker Replaced

ML19262A180
Person / Time
Site:	Three Mile Island
Issue date:	01/13/1975
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910260506
Download: ML19262A180 (4)

Text

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AEC D:ST R. JT:O*: FCR ? ART 50 CCC;3T :.%. il AL (T E T.~.F O ?. A R Y F O iv )

CONTROL NO: 4o7 ,

FILE: INCIDEN PIEC.' L F RO:.ntetr'oplitan Edison Co. DATE OF CCC ' OATE REC'D LTR T'.'l X ' R P T C T H E ?.

Reading, Penn 1-13-75 1-16-75 1xxxx R.C. Arnold xxxxx ORIG CC OTHER{ SENT AEC PCm TO: xxx Directorate of Licensing 1-signed l SENT LCCAL POR UNCLAES '

PROPli:FO INPU i c.O CYS REC'D COCKETWO: .

CLASS xxxxx 1 50-289 DESci;l? TION: ENCLOSURES:

Ler reporting abnomal occrrer.:e #75-01 on 1-3-75 concerning failure ce the IC high pressure injectionpump (MU_- PIC ) to . ,

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Dear Sir. 'n Operating License DPR-50 Docket #50-289 In accordance with Technical Specifications for the Three Mile Island Nuclear Station Unit 1, we are reporting the following abnormal occurrence:

(1) Report Number: A0 50-289/75-01 (2a) Report Date: JAN 131975 (2b) Occurrence Date : January 3, 1975 (3) Facility : Three Mile Island Nuclear Generating Station thit 1 (4) Identification of Occurrence:

Title : Failure of the 1C High Pressure Injection Pump (MU-PlC) to Start on an ESAS Signal Type: An abnormal occurrence as defined by the Technical Specifications, paragraph 1.8d, in that the failure of the 1C High Pressure Injection Pump to start on an ESAS Signal threatened to cause an Engineered Safety feature or system to be incapable of performing its intended function.

(5) Conditions Prior to Occurrence :

The reacto r was at steady state power with major plant parameters as follows:

Power: Co re : 100%

Elec.: 863 MW (Gross) -

RC Flow: 139 x 10 6 lb/hr }k u

4. 0i es r

RC Pressure : 2155 psig RC Temp : 579 F PRZR Level: 235 in.

PRZR Temp.: 655 F (6) Description of Occurrence:

During a High and Low Pressure Injection Logic and Component Surveillance Test (1303-512) high pressure injection pump MU-PIC f ailed to start on an automatic Engineered Safety features test signal . The test signal was then cleared and an attempt was made to s tart MU-PIC from the control room. This also failed.

Subs equent investigations revealed that the pump did not start be-cause its circuit breaker had failed to close.

The redundant High Pressure Injection Pump MU-PIA was verified as operable. A spare 4 KV ES breaker was tested and used to replace the circuit breaker that failed . The ESAS test was then repeated and MU-PIC operated satisfactorily.

(7) Designation of Apparent Cause of Occurrence A visual inspection of the faulty circuit breaker revealed a loose termination on the breaker release it*ernal control wiring causing an open circuit in the spring release tctl circuit. As this coil must be energized to close the circuit breaker the motor circuit breaker did not close mad the pump did not start.

It is believed that the apparent causa of the occurrence is manufacture in that the termination most likely was not sufficiently tightened when assembled; however, design has not been ruled out as a possible cause of the occurrence in that if sufficient lock washer (s) had been utilized on the termination, a possibly tight te rmination would not ha.e been able to work its way loose.

(8) Analysis of Occurrence It is believed that the failure of the MU-PIC High Pressure Injection Pump to start did not represent a threat to the health and safety of the public as only one makeup pump is necessary to supply sufficient emergency cooling water. As the lA Makeup Pump was lined up for Engineered Safe-guards service and was verified as operable ar.1 as the IB Makeup Pump (opc;ating at that time in the normal makeup mode) would have been avaliable for Engineered Safeguards service, suf ficient cooling water was available.

(9) Corrective Action Immediate corrective action was taken as described above to return the effected pump to service. In addition , terminations were tightened on the effected breaker that was removed from service, and the breaker tested satisfactorily.

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The Plant Operations Review Committee (PORC) met shortly af ter the occurrence and approved the immediate corrective actions, and as a long term preventative action recommended to the Station Superintendent that an inspection be conducted of all 4 KV ES breakers to check for loose connections and to ensure that loose connections are tightened. The Station Superintendent agreed with PORC's recommendation and has taken steps to ensure its implementation, and it is presently anticipated that this inspection will be completed within the next two to four weeks.

In addition, steps will be taken to contact the manuf acturer and correct any possible design deficiencies that may exist.

(10) Failure Data

a. Previous Failures: None

b. Equipment Identification: Westinghouse Air Circuit Breaker 50 DH-P 350 S tyle : 25 Y 444031 Amps: 1200 Rated KV: 4.16 Mech: FAB SPRG Sincerely,

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. C . Arnold Vice President RCA:RSB:tas cc: Directorate of Regulatory Operations , Region 1 U. S. Atouic Energy Commission 631 Park Avenue King of Prussia, PA 19406 File: 20.1.1 7.7.3.5.1

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