ML19309A979

Supplemental LER 79-009/03L-0:on 790429,while Measuring MSIV Limit Switchtrip position,13 of 16 Switches Were Set at Greater than 10% of MSIV Closure.Caused by Failure to Field Calibr Exact Limit Switch Trip Point.Switches Adjusted

ML19309A979
Person / Time
Site:	Quad Cities
Issue date:	03/17/1980
From:	Vahrenwald J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309A974	List: ML19309A973 ML19309A979
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 8004020443
Download: ML19309A979 (2)

Text

NRC FQ EM 366 U.S. NUCLEAR REGULATORY COMMISSloN 873D UPDATE REPORT--

PREVIOUS REPORT DATE 5-11-79 LICENSEE EVENT REPORT CONTROL 8 LOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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o I A l0 CODE l 2 l@l 14 015 ] 0 l 0 l - l 0LICENSEl 0 lNUMBER 0 l - l 0 l 0 l 0 25l@l 264 l ILICENSE l 1 l 1TYPE l 1JOl@l57 CATl 58 l@ i CON'T l0lij j'0y, l L j@l 0l 5 l 0l 0 l 0 l 2 l 6 l 5 l@l 0 l 4 l 2 l 9 l 7 l 9 ]@l 0 l 3 l 1 l 7 l 8 l0 l@

1 8 60 63 DOCKET NUMSER 68 69 EVENT 0 ATE 74 75 REPORT DATE 60 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h 10f21l While measuring MSIV limit switch trip position, 13 of the 16 switches measured were l gog3; l found to be set greater than 10% of MSIV closure. The 10% closure settings were l ITTTl I originally set at the factory prior to installation and unit startup. Monthly l 10 i s t ! MSIV closure scram functional testing has been performed to verify scram function l

[TTs'l I operabl i l i ty. This update report Completes the scram closure measurements which were l l0l7; j started on April 29, 1979 [

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9 10 11 12 13 13 19 20 SEQUENTIAL OCCURRENCF REPORT REVISION LER EVENT YE AR PEPORT NO. COOE TYPE N O.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li 10 l l The need for prior orecise field calibration of the exact limit switch trip point had l i i l not been deemed necessary to be performed. A special procedure was develooed to enabl 4

, 2 l exact measuring .of. the switch trip position in the field. As-foufid corrected switch I i 3 l positions are attached. The switches were adjusted to 1 10% closure and functionally l g

tested.  ;

7 8 9 80 5 S  % POWER OTHER STATUS 01 O RY DISCOVERY DESCRIPTION

s lHl@ l0l0l0l@l NA Test l lC[@l l ACTIVITY CO TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 P.ELEASE@D OF RELEASE l NA l l NA l

PERSONNEt ExPOSUEES NUMBER TYPE DESCRIPTION y l0l0l0l@lZl@l NA l

' PERSONNe'L iNJu' RIES NUMBER DESCRIPTION 7

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LOSS OF CR DAMAGE TO FACILITY TYPE OESCRIPTION 1 9 NA 8 3 l Z l@l l 7 10 80 NA 2 0 ISSUE' @l DESCRIPTION l lllllllllllll{

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i NAoEO,,ng,4pgg J. Vahrenwald 8 004 02.D ON E: 309-654-2241 ext. 195 {

MSIV LIMIT SWITCH TRIP *0SITl0NS 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% ' 5%

. 14.4% 8.2% 4.4%

.2-203-1B' 18.0% 9.4% 8.0% 16.0% 8.4% 6.0%

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% 8.8% 2.7%

OUTBOARD VALVES SCRAM CHANNEL "A" SCRAM CHANNEL "B"  ;

vlave number as found corrected  % erroc as found corrected  % error ._

2-203-2C 20.8%- 8.5% 10.8% 11.7% 6.9% 17%

2-203-2D 4 9% 8.9% 0.0% 6.0% 7 9% 0.0%

2-203-2A 13 9% 8.8% 3.9% 12.7% 8.7% 27%

2-203-2B 9 9% 9 9% 0.0% 10.1% 8.2% 0.1%

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