ML20086J451

Telecopy AO 74-1:on 740918,ground Fault Found in RHR Pump Motor 3B.Cause Unknown.Defective Motor Being Removed & Replaced or Repaired

ML20086J451
Person / Time
Site:	Peach Bottom
Issue date:	09/19/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086J448	List: ML20086J446 ML20086J451 ML20086J455 ML20086J459
References
AO-74-7, NUDOCS 8401230691
Download: ML20086J451 (1)

Text

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P ch Botton Atomic Pevsr Station l d

M QO Dalta, Pannaylvania 17314 n

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. September 19, 1974 th.JamesP.O'Reilly, Director United States Atomic Energy Comission j Directorate of Regulatory Operations 631 Park Avenue King of Prussia, Pennsylvania 19406 )

l

Subject:

Abnormal occurrence 24-Hour Notification Confirming W. T. U11 rich's phone conversation with Mr. Walt Baunack, A.E.C.

Region 1 Regulatory Operations Office on September 19, 1974.

Reference:

License Number DPR-56 Technical Specification Reference 3.5.A.3  !

Report No.: 50-278-74-7 Report Date: September 19, 1974 Occurrence Date: September 18, 1974 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 l

Identification of Occurrence:

Ground fault in 3B RHR pu=p motor.

Conditions Prior to Occurrence:

Maintenance outage in progress. Reactor shutdown.

Description of Occurrence:

The "B" RHR pump was being started in the shutdown cooling mode. As the motor was energized, it innediately tripped on inacantaneous overcurrent.

Designation of Apparent Cause of Occurrence:

Cause of occurrence unknown at this time.

j Analysis of Occurrence:

The motor breaker tripped upon energiration of the motor. The pump was to be used in.the shutdown cooling mode to cool the reactor to 150'F. Decay heat at this time in core life is small and one of the other three 101R pumps was used for this servic e. There is no safety significance associated with this failure.

l Corrective Action

• l The notor leais were disconnected and electrical testing indicated that the protective instrumentation had operated properly. There was a low resistance between phase and ground on the cotor. *ihe defective motor is being removed and sources for replacement motors and repair are being investigated.

Pailure Data: 8401230691 740928 None, gDRADOCK 05000278 PDR Very truly youro, hW flNY W. T. Ullrich, Superintendent Psach Botton Atomic Power Station

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