ML20086H120

Telecopy AO 75-64:on 750929,main Steam Line High Flow Switch DPIS-3-2-116A Found at Value Slightly Higher than Specified by Tech Spec.Caused by Setpoint Shift.Device Checked for Setpoint Repeatability & Recalibr

ML20086H120
Person / Time
Site:	Peach Bottom
Issue date:	09/29/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086H119	List: ML20086H117 ML20086H120
References
AO-75-64, NUDOCS 8401130433
Download: ML20086H120 (1)

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3 PHILADELPHIA ELECTRIC COMPANY L/

Peach'Bottoc Ato=ie Power Station 4 , Delta. Pennsylvania '

1731h September 29, 1975 l-Mr. Ja=es P. O'Reilly, Director

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• Office of Inspection & Enforcement i

Region 1 2444L #4

.' United States Nuclear Regulatory Commission 631 Park Avenue 'h h

'l King of Prussia. Pennsylvania 19h06 S ub.9 e c t :-

Abnor=al Occurrence PL-Hour Kot i fi cation Confirming W. T.

' U11 rich's paone conversation with Mr. Nalt Baunack, .

Region 1. United States Nuclear Regulatory. Commission on September 29,1975.

Reference:

License Number DPR-56 c

Technical Specification

Reference:

Table 3.2.A

• Report No.: 50-278-75-6h Report Date: , September 29, 1975 Occurrence Date: September 29, 1975

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, Tacility: Peach Botto= Atomic Power Station R.D. 1. Delta, Pennsylvania 1731h

^ Identification of Occurrence: '

Setpoint shift of the main steam line his,h flow switch dP13-3-2-116A .

Conditions Prior to Occurrence:

I Unit 3 at approximately 555 power.

l- Description of Occurrence: .

'l During a routine instrument surveillance test, dPIS-3-2-116A was found to trip at a value sli6htly higher than that specified in '

the Technical Specifications.

• Desigantion of Apparent Cause of Occurrence:

\ Setpoint shift.

Analysis of Cecurrence:-

Because the setpoint shift was slight and this switch operates i= a r . ~

one-out-o are mini =al.

f-two twice lo61c, the safety implications of this occurrence

~ Corrective Action: *

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i ' The device was checked for setpoint rep e at ability , recalibrated, and l

• rechecked for setpoint repeatability and correct functions per the applicable surveillance test.

f. Failure Data:

l f.

I Previous failures of this type device in this service reported as Abnormal Occurrence Report Nu=bers 50-278-75-k1, 50-278-75-23, l

/50-278-7h-33 and 50-278-74-20.

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Very.truly yours,

, [YNVa [

I W. T. Ullrich,' Superintendent j Peach Botto= Asc=ic Power Station  ;

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p-i 8401130433 751009 .

PDR ADOCK 05000278 e 3 ~ PDR -

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