ML20086J490

Telecopy AO 74-5:on 740910,emergency Shutdown Panel RCIC Static Inverter Tripped from Operation of Barometric Condenser Condensate Pump.Cause Under Investigation.Inverter Unit Replaced

ML20086J490
Person / Time
Site:	Peach Bottom
Issue date:	09/11/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086J487	List: ML20086J485 ML20086J490
References
AO-74-5, NUDOCS 8401240038
Download: ML20086J490 (3)

Text

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PHILADELPHIA ELECTRIC CCEPANT Peach Bottom Atomic Power Station o R

. Delta, Pennsylvania  !, '

1. El/#M 1731' EWK ygp .* (,4/ . 8 8 /4 M September 11, 1974 Mr. James P. O'Reilly, Director United States Atomic Energy Commission ;j i Directorate of Regulatory Operations 631 Park Avenue -

King of Prussia, Pennsylvania 19406 -

O

Subject:

Abnormal Occurrence 24-Hour Notification j h

Confirming W. T. U11 rich's conversation with Mr. Walt Baunack,

Report Date: .,ISeptember 11, 1974 .,

Occurrence Date: September 10, 1974 Facility: Peach Bottom Atomic Power Station .

1.D. 1. Delta, Pennsylvania 17314 '!

Identification of Occurrence:

Unit 3 Emer8ency Shutdown Panel RCIC static inverter tripping from (

operation of the Barometric Condenser Condensate Pump ,

Conditions Prior to Occurrence: Y!

, Reactor at approximately 22". power with RCIC in test. at the Emergency Shutdown Panal. 4 Description of Occurrence. q During the test run of the RCIC from the Emergency Shutdown Panel, the static-invertc; f c-ding the--RCIC flow-controllermethe taurgency -

Shutdown Panel tripped repeatedly upon starting of the'RCIC~: Barometric t.

. NCondenser Condensate Pump. Each time, it was immediately reset. i

' Designation of Apparent Cause of Occurrence:

a2a: Under investigation; preliminary investigation points to a failure in

@ the trip circuitry of the particular inverter unit.

O w Analysis of Occurrence:  :)'

0 At the time of the inverter trippings, all other Unit 3 Emergency Core 1

$c Coolin6 Systems were operable. Due to this and the short times that h 88 the inverter was tripped, this occurrence has minimal safety significance.- Iy i w ct \\ jb

@ Corrective Action: h.? ',kd

$$ The problem was traced to the inverter unit, which was replaced with a id Y

mn.m spare. The spara inverted has not tripped throughout the remainder of b the RCIC testing at the Energency Shutdown Panel. ., S, s- ,

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Five other trippings of RCIC invertars have been reported as ,

A0-50-277-74-14, A0-50-277-74-20, A0-50-277-74-37, A0-50-277-74-39, _

and A0-50-277-74-40. .

=--

. . d Yery truly yours, M[M '

U. T. Ullrich, Superintendent ,

Peach Botton Atomic Power Station 8

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1. Beport !!o. 50-e7F/4 Reported by 2a. Report Date __

2b. Occurrence Date 9-- /O ,7v/ __

i 3 Facility - Peach Ectten R. D. fl. Delta,Atomic Power 17314 Pennsylvania Station - Unit 2 h#g '  % ^[/

b Identification of Occurrenco: Tech Spec Rer. TfO

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scription d. J of Occurrence: .

feruNf 2t(< k Vrwr l /de AC/C .fre., N G.a.e.<ys.ny SdSos*. Af Ydt sk/ch$ev/w- -Szdh & ACic $6 ?u cm kaSee- ) N L,.

%% La/ Lyd ryuh)p fMe LC'c Jn,6 an w 2L.us-,4 6ye:ym c~d sh,/mg%.p #~~ --adls <~4 l7 Designation of Apparent cause or occurrence l .

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8. Analysis of Occurrence (Safety Implications) -

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