ML20086H012

AO 75-12:on 750214,HPCI Steam Supply Line Drain Sys Failed to Drain Properly.Caused by Failure of Steam Trap to Drain & Drain Pot Level Switch to Trip on High Level.Steam Trap Cleaned,Reassembled & Returned to Svc

ML20086H012
Person / Time
Site:	Peach Bottom
Issue date:	02/24/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086H015	List: ML20086H012 ML20086H017
References
AO-75-12, NUDOCS 8401130246
Download: ML20086H012 (2)

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET

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q February 2h,1975 Mr. A. Gianbusso, Director Division of Reactor Licensing Office of Nuc1cor Recctor Regulations United States Nuclear Regulatory Cc: mission Washington, D.C.

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Subject:

Abnotwal Occurrence The follcwing occurrence was reported to Mr. Walt Baunack, Office of Inspection and Fnfon:cment, Region 1, United States Ihiclear Regule.torf Co nissien en Febntary 1h,1975. Written notificction was made to Mr..Tmen P. ON411y, Occi-a of 1'nep~ ti~t end F,ferc=t, Retrica 1, United States Nuclear Regulatory Cc: mission on Febntary 1h, 1975 In accordance with Section 6.7.2.A of the Technical Specificaticns, Appendix A of DPR-56 for Unit 3 Peach Botteet Atomic Power Station, the follcring report is being submitted to the Directorate of Reactor Licensing as an Abnornal Occurrence:

Rcrerence:

License Nunber DPR-56 Technical Specification

Reference:

3 5.C.1 Report No.:

50-278-75-12 Report Date:

February 2h,1975 Occurrence Date:

February 1h,1975 Facility:

Peach Botten Atcnic Power Station R.D.1, Delta, Pennsylvania 1731h Identification of Occurrence:

1 Failttre of the HPCI Steam Supply Lino Drain Systcn to properly drain.

3 Conditions Prior to Occurrence:

Unit 3 at approximately 100% power.

l 2330 8401130246 750224 DR ADOCK 0500027 COPY SENT REGION

Mr. A. Gitmbusso Febmary 214, 1975 O

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Desclintion of Occurrence:

Investigation, initiated uhen movment of the HPCI steam i

supply line was noted, revealed that the steam supply line drain pot was not draining through the out1ct steam trap nor had the drain pot i

high 1cyc1 switch, LS-3-23-90, actuated to open the steam trap bypass valve. This allowed accumulation of water in the steam supply line.

i Designation of Annarent Ccuse of Occurrence:

l Failure of the stecn trcp to drain and failure of the drain

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pot level switch to trip on hi h level.

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Annlysis of Occurrence:

At the time the accumulation of unter was discovered, the

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reactor was operating at steady state conditions with no operational or surveillance requircnents to mn the HPCI systm. In the unlikely event that the HPCI was initiated and it had beci noccssary to shut it down, the RCIC and ADS systms were availabic for high pressure conditions.

Therefore the safety ir:plicatiens of this occurrence are minimal.

1 Corrective Action:

The stern trop was dismentled and it iras fcund that the trap orifice uss plugged with a small cmount of dirt.. The trap was cleaned, 1

reassmbled, returned to sorrice and is operating prcperly. The IcVel switch adjustacnt linkage uns found to be binding.

The switch mechanisn was realigned, returned to sertice, and is operating i

satisfactorily.

I Failure Data:

j None.

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i Ver/ tm]y yours, 7

M. J Cooney Ass't Genil, Supcrintendent Generation Division cc:

Mr. J. P. O'Ecilly Director

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Office of Inspcction and Enforement Region 1 United States liuclear Regulatorf Connission W

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