ML19270H011

Forwards LER 79-009/03L-0.Corrects Docket Number of Original Forwarding Ltr

ML19270H011
Person / Time
Site:	Quad Cities
Issue date:	06/13/1979
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NJK-79-210, NUDOCS 7906220359
Download: ML19270H011 (1)

Text

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Commonwealth Edison bhb Quad Cities Nuclear Power Station 22710 206 Avenue Nonn Corcova, luinois 61242 Teisphone 309/6S&2241 NJ K-79-210 June 13, 1979 Mr. J. Keppler, Regional Director Office of Inspection and Enforcement Region lil V. S. Nuclear Regulatory Commission 795 Roosevelt Road Glen Ellyn, IL 60 B7

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30, Unit 2 Appendix A, Sections 3.1 (Table 3 1-1) and 6.6.B.2.a This letter is to correct the docket number on the cover letter previously submitted with Reportable Occurrence Report No. RO 79-09/03!,, Docket No.

50-265, DPR-30, Unit 2 (May 11, 1979).

The Docket No. on the LER form is correct. Please change the cover letter to read Docket No. 50-265. DPR-30, Unit 2, or attach this letter to the original cover letter.

Very t ruly yours ,

COMMONWEALTH EDISON COMPANY g97 QUAD-CITIES NUCLEAR POWER STATION } -]' 4 VCI

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N. J. Kalivi~anakis Station Superintendent NJ K/JCV/ san 1$19IC cc: R. F. Janecek Y

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EV ENT CATE h REPORT O ATE 80 3 8 60 61 DOCKET NUM9ER 63 EVENT DESCRIPTION AND PRC8ASLE CONsECuENCES h a12 l While measuring the MSIV limit switch trio cositions durine a weekend outace. 10 of the!

jo 3  ; 12 switches measured on 6 MSIV's were found to be set greater thai. 10% of MSIV closure.]

l These measurements were performed at the request of NRC Inspector G. Vricht. The f o 4 io 3 l 10% closure settings were originally set at the factory prior to installation and [

lo is l unit startup. Monthly MSIV closure scram functional testina has been cerformed to f

.o  ; [ verify scram function operability. The remaining 2 MSIV's will be checked at a [

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SYSTEM CAUSE CAUSE COMP. VALVE CCOE COCE SU9 CODE CCMPON ENT COOL SUBCCCE SUSC005 io lo I i l A lh I Bl@ LcJ@ l l l N I S I T l R llaU lh [_Sjh l Z l h 13 19 20 i 8 9 to 11 12 SEQUENTI AL CCCtJ R R ENCE REPORT REVISION EVENT YE AR REPCRT NO. COCE TYPE N O.

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44 3J 34 CAUsE DESCRIPTION AND CORRECTIVE ACTICNs l1 o j l The need for orior orecise field calibratien the exact lir,ir switch t-in -nint had f

ij q lnot been deemed necessary to be performed. A special procedure was develoced to enablef

, ,  ; exact measuring of the switch trip position in the field. As-found and corrected l 3 [swi tch posi tions are attached. The switches were. adjusted tof.102 closure and l 3 ,4  ; functionally tested.

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MSIV LlHIT SWITCH TRIP POSITIONS

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INBOARD VALVES SCRAM CHANNEL "A" SCRAM CHANNEL "B" valve number as found corrected ' % error as found corrected  % error 2-203-1A 14.5% 9.6% 4.5% 14.4% 8.2% 4.4%

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18.0% 8.0% 16.0% C.4% 6.0%

2-203 IB 9.4%

2-203-1C 11.3% 8.8% 1.3% 13.5% 8.5% 3.5%

2-203-1D 16.0% 9.8% 6.0% 12.7% 8.2% 2.7%

OUTBOARD VALVES SCRAM CHANNEL "A" ,5 CRAM CHANNEL "B"

! /alve number as found corrected  % error as found corrected  % error 2-203-2C 20.8% 8.5% 10.8% 11.7% 6.9% 1.7%

2-203-2D 4.9% 8.9% 0.0% 6.0% 7.9% 0.0%

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