ML20086H744

AO 75-46:on 750620,reactor Low Level LPCI Switch LIS-2-2-3-72B Failed to Pick Up During Surveillance Test. Caused by Misalignment Between Magnet & Reed Switch.Reed Switch Realigned to Provide Optimum Switch Pickup

ML20086H744
Person / Time
Site:	Peach Bottom
Issue date:	06/30/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Anthony Giambusso Office of Nuclear Reactor Regulation
Shared Package
ML20086H747	List: ML20086H744 ML20086H748
References
AO-75-46, NUDOCS 8401200177
Download: ML20086H744 (2)

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA. PA.19101 1215)0414000 June 30, 1975 Mr. A. Giambusso Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Conmission Washington, OC 20555

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Wal

Saunack, Region I, Office of Inspection and Enforcement, ;nited States Nuclear Regulatory Commission on JJne 20, I)75 Written no:ification was mace to Mr. James P. O'Reilly, Region 1, Office of Irsoection and Enf:rcemen:,

United States Nuclear Regulatory Commis sion o?, J;ne 2], 1375 In accordance with Section o.7 2.A of the Technica: Specifications. Apoe : 4 x A of DPR-M for Unit 2 Peach Bottom Atomic Pcwer Station, t.,e f e : l o'.w i r ;

occurrence is being submitted to the Direc: crate of :,cac:c uicens'.n; as an Abnormal Occurrence.

Reference:

License N;,ber DPR-%

Tecnnical Specification ;c?eren;ci

-aa'e 3 2.5 Report No.:

30-277-75-43 Repor; Date:

June 30, 1975 Occurrence Date:

June 20. 1975 Facili;y:

Peach Bo;;o, A;c,4

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Icentification of Occurrence:

i Failure of Reactor Low Le se ! LPCI

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- (L..-2-2-3,":.)

pick up during surveillance tes.:.

Conditions Prior to Vccurrence:

Unit 2 shutdown.

Description of Occurrence:

l During a routine functional surveillance test, the contacts which provide the LPCI system initiation from reactor low water level failed to operate.

3401200177 750630 PDR ADOCK 05000277 8

PDR

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Mr. A. Giambusso

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277-75-46 June 30, 1975 Paae 2 Designation of Apparent Cause of Occurrence:

Misalignment between the magnet and reed switch.

I Analysis of Occurrence:

Because the contacts on this device which provide the LPC:

System initiation are arranged in a one-out-of-two twice logie, tnis occurrence has minimal safety implications.

Corrective Action:

The reed switch was realigned to provide optimam switsn pickup. The switch was functionally tested several times and enecked for setpoint using the appropriate surveillance test.

Failure Data None.

Very truly yours, ffspy M. J[ Cooney Ass't Gen'l Superintendent Ger.cratien Division ec:

Mr. J. P. O'Reilly Director, Region 1 Office of Inspection and Enforcement United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 13400 0

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