ML19294B161

LER 80-002/03L-0:on 800118,while at Power During Insertion of Tip Probe 5 Into Core,Tip Probe Inshield Light Came On. Probe Could Be Inserted,But Not Withdrawn.Caused by Tip Inshield Limit Switch Being Out of Calibr

ML19294B161
Person / Time
Site:	Peach Bottom
Issue date:	02/15/1980
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002270371
Download: ML19294B161 (1)

Text

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Mr. Boyce H. Grier, Director No. 3 2/3L Office of inbpection & EnforLenent, keyson i U.S. Nuc icar Regulatory Commission 63I P.,rk Avsnue King of Prunie, PA 1 %O6

Dear Mr. Gricr:

This LER refers to the spurious operation of tip machine number five "in-shield" limit switch while the p m be was between the shield and the oore. The goveming Technical Specifications are 3 7.D.2 and Table 3 7.1 U. E. 80UCLEAR REGUL AToRY CoMMissaON LICtENSEE EVENT HEPORT CONTROL blO(A , l l l l l l l l' LEASE PRINT OR TYPE ALL REQUIR&D ANFORMATION) e A

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LVENT DE5cM PTION A D PHOti A CNE ENCEb

[I7"] l l While at power and during insertion of the number five tip probe into 1 g,y I the core, the tip probe "in-shield" light came on. The probe could be I

f. T71 I inserted but not withdrawn and in the event of a PCIS signal the ball I yi valve would not properly isolate the tip tube because the probe was 1

[g i between the ball valve and the core. However, manual operation of the I

['i'lq shear valve was operable and therefore available to isolate the tip I riqq t tube. I

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gl The event was caused by the tip "in-shield" limit switch being out of I

. . t calibration.1. switch housing adjustment corrected the situation. ihe  !

mqg tip machine was satisfactorily tested and retumed to service within I two hours.

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