ML20086K311

AO 75-18:on 750213,DPIS-2-2-129C Failed to Respond to Change in Differential Pressure.Caused by Linkage Binding.Wiring Redressed,Switch Recalibr & Tested in Accordance W/ Applicable Surveillance Test

ML20086K311
Person / Time
Site:	Peach Bottom
Issue date:	02/23/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
Shared Package
ML20086K314	List: ML20086K311 ML20086K318
References
AO-75-18, NUDOCS 8401270020
Download: ML20086K311 (2)

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PHILADELPHIA ELECTRIC COMPANY  %

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Febmary 23, 1975 fM fN d

Mr. A, Ginmbusso p\

Directer Livision of ReacL:'r Licensing Office of Nuclear React.or Regulations Unit >d Stati.a Nuclear Regulatory Cc": mission Washin; 5 , D.C. 20555 Dear Mr. Gicabusso

Subject:

Abnomal Occurrence The following occurrence was reported to Mr. Ga27 Snyder, Region 1, Office of Inspection and Enfomcment, United States Nuclear Regulatory Ccr: mission on Febmary 2h,1975 Written notification was mode to Mr. Jmes P. O'Reilly, Office of Inspcotion and Enforconent, Region 1, United States Nac1 car Regulatory Cecmtission on Fchmery 111, 1975. In accordance with Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-M for Unit 2 Peach Botten Atomic Pcwcr Station, the fo11cwing report is being submitted to the Directorate of Reactor Licensing as an Abnomal Occurrence:

Reference:

License Number DPR-Ish Technical Specification

Reference:

3 2.B Report No.: 50-277-75-18 Report Date: Febma ry 23,1975 Occurrence Date: Febmary 13, 1975 Facility: Peach Bottom Atcrtic Power Station R.D. 1, Delta, Pennsylvania 1731h t, Identification of Occurrence:

Failure of dPIS-2-2-129C (LPCI loop sc1cetion based on jet

pump riser AP) to respond to change in differential pressure.

Conditions Prior to Occurrence:

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Unit 2 shutdown. 'gev-Y 8405,270020 7SO223 P". ADOCK 05000277 S PDR COPY SENT REGION [

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l Mr. A. Giambur m j

. Febru:ry 23, .() V Pcga 2 Deceription of Occurrence:

During a routine instrument surveillance test, dPIS-2-2-1290 failed to respond to a differential pressure signal.

Deninnation of Anparent Cause of Occurrence:

Linkage binding caused by wiring within the switch.

Analysis of Occurrence:

'Ihe safety implications of this failure are mininal because this switch is part of a one-of-two twice logic and would not have preventoi to correct loop selection.

Corrective Action:

Upon disassembly of the switch, it was found that one of the intemal connecting wires vos interfering with the switch linkage.

The viring was redressed; the switch was recalibrated and tested in acconlance with the applicable surveillance test.

Failure Data:

Nonc previous.

Very t2uly youra, M. . Cooney Ass't Ocn'l Superintendent Generation Division cc: Mr. J. P. O'Reilly Director Office of Inspection and Ihfo2tcnent Region 1 United States Nuclear Regulatory Ccemission 631 Park Avenue King of Prussia, PA 191405 4