05000249/LER-1980-005, Forwards LER 80-005/01T-0

Forwards LER 80-005/01T-0

ML17192A533
Person / Time
Site:	Dresden
Issue date:	02/25/1980
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17192A534	List: 05000249/LER-1980-005, Forwards LER 80-005/01T-0 05000249/LER-1980-005-01, /01T-0:on 800213,while in S/D Mode,Msiv Scram Limit Switches Were Checked & of 16 Limit Switches,Two Found to Have Setpoints Greater than 10%.Caused by Switch Out of Calibr.Limit Switches Readjusted
References
80-148, NUDOCS 8003040531
Download: ML17192A533 (3)

LER-1980-005, Forwards LER 80-005/01T-0

Event date:
Report date:
2491980005R00 - NRC Website

text

Com~o~wea1t19tison Dresden Nuclear Power Station R.R. #1 Morris, lllfnois 60450 Telephone 815/942-2920 BBS LTR //80~148 February 25, 1980 James G. K?ppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #80-5/0lT-0, Docket #050-249, is hereby submitted to your office in accordance with D~esden Nuclear Power Station Technical Specification 6.6.B.l.(a), failure* of the reactor*

protection system or other systems subject to limiting safety sys-tem settings to initiate the required protective function by the time a monitored parameter reached the setpoint specified as the limiting safety system setting in the technical specifications or failure to complete the required protective function.

BBS:lcg Enclos*ure B. B. Stephenson Station Superintendent Dresden Nuclear Power Station cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

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ATTACHMENT TO LICENSEE EVENT REPORT 80-5/0lT-Q COMMONWEALTH EDISON COHPANY (CWE)

DRESDEN UNIT ILDRS 3 DOCKET fl 050-249 Quad Cities Station was requested by the NRC to check the MSIV scram limit switch s~tpoints. Several setpoints were not < 10% as required by Tech Spec. Table 3.1.1.

During the current Unit 3 refuel outage, the MSIV scram limit switches were checked*.

Of the sixteen

• (16) limit switches, two (2) were found to have setpoints greater than*

10%. _J1SIV.:._3-:-2G3-::1B:.had __ one 1 (1) limit switch with a setpoint of 12%,

while MSIV 3-203-2D had one (1) limit switch with a setpoint of 13.4%.

These two (2) MSIV's had a ~edundant MSIV in the line with setpoints

< 10%, and therefore this event is of minimal sa~ety significance.

This type of event has occurred before at Dresden.

(See RO 1179-57/

OlT-0, Docket /1050-237).

The Namco Controls Snap-Lock Limit Switch setpoints were set by the manufacturer.

The need for field calibration of the exact limit switch trip point did not seem-necessary at the time of installation.

The limit switches were readjusted and demonstrated operable.

No further action is necessary;

LICENSEE EVENT REPORT

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(PLEASE PRINT OR TYPE ALL.QUIRED INFORMATION}

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9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 lON'T OD 8

~;~~~~ ~©I o I s-I o I o I o 12 I 4 I 9 101 o I 60 61 DOCKErNUMBER 68 69 EVENT' DESCRIPTION AND PROBABLE CONSEQUENCES@

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80

!'VENT DATE I While in the.S/D mode of operation the MSIV scram limit switches were checked.

Of E:J:I1Ithe16 limit switches 2 were found to have setpoints> 10%.

This event was of minimal jiJTI I safety significance since the MSIV' s with limit switch setpoints :::> 10% also had a re-f[IIJ I dunda~~ MSIV:'in the same line with limit switch setpoints of( 10% as. required by Tech.I

~

I Spec. Tabl.e 3.1.1.

This type of event has occurred before at Dresden.

(See R0/179-57/

[DJ I OlT-0, Docket 11050~237)*.

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SYSTEM CODE I I IAI@

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LEA/RO CVENT YEAR v.:.; REPORT I 8 I 0 I NUMBER 21 22

CAUSE

CAUSE CODE

SUBCODE, COMPONENTCOOE

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11 12 13 18 SEQUENTIAL OCCURRENCE REPORT NO.

CODE I I I o I o I s I I/!

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VALVE SUB CODE SUBCODE

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REPORT TYPE LLl L=J JO 31 ACTION FUTURE EFFECT SHUTDOWN

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ATTACHMENT NPRD-4 FORM :;us.

PRIME COMP.

SUPPLIER REVISION NO.

LQJ 32 COMPONENT MANUFACTURER TAKEN ACTION ON PLANT

. METHOD HOURS ~

.. SUBMITTED*

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

42 43 44 47 jThe Namco Snap Lock limit switch setpoints were set bv the manufacturer. *The need for

IIIJ I field calibration of the *exa-Ct limit switch trfp p~fnt did not seem-necessary at the _ I*

I time of installation.

The limit swftches were readjusted* and dem6ns~ratea operable.*

I No further action is necessary.

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9 F*ACILITY f:iO\\

STATUS

% POWER OTHER STATUS \\::::;:J till W@ 10 10 10 I@!..... __

N_A ___

80 METHOD OF r:;::;...

DISCOVERY DISCOVERY DESCRIPTION '23;

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CT";;jRELEASED OF RELEASE AMOUN~ OF ACTIVITY

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10 11 44 45 46 44 80 NA

.. LOCATION OF RELEASE@

45 80 PERSONNEL EXPOSURES Q.

NUMBER A

TYPE DESCRIPTION~

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11 12 13 PERSONNEL INJURIES r,;";\\

NUMBER DESCRIPTION6 tfil. Io I o I o l@'---__

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80 8

9 11 12 LOSS OF OR DAMAGE TO FACILITY 0

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TYPE

DESCRIPTION

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PUBLICITY G\\

NRC USE rNLY ISSUEDt,;:;'\\OESCRIPTION ~

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