05000265/LER-1979-009, 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 Adju

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:
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 8004020443
Download: ML19309A979 (2)

LER-1979-009, 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

Event date:
Report date:
2651979009R00 - NRC Website

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 l

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 i

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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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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.

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.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 0% closure and functionally l 1

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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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