ML19325D193

Forwards Quarterly Rept on Static-O-Ring Failures Third Quarter 1989,per IE Bulletin 86-002.Stated Switches Replaced

ML19325D193
Person / Time
Site:	LaSalle
Issue date:	10/13/1989
From:	Diederich G COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
References
IEB-86-002, IEB-86-2, NUDOCS 8910190165
Download: ML19325D193 (3)

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.T Commonwealth Edison:

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RuralRoute #1, Box 220 ,

1. - Marsentes, Illinois 61341" <1 9

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Telephone 815/357 6761 j f ~

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October'13, 1989-

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Director of Nuclear Reactor Regulation l

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Mail Station P1-137

Washington, D.C.- 20555

SUBJECT:

COMMONWEALTH EDISON LASALLE-COUNTY STATION UNITS 1 AND 2 g OUARTEELY REPORT ON STATIC-O-RING (SOR) FAILURES. j REFERENCES. (a)~ W.E. Morgan letter to U.S. NRC dated February 6, 1989,

, Requesting Relief from. Static "O" Ring Reportability.  !

(b)' P.C.-Shemanski letter:to T.J. Kovach dated June 20, 1989,

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- transmitting Approval of Static 0" Ring Reportability Request.

I (c) 'W.E.- Mcrgan letter to Dr. T.E. Murley, U.S. - NRC, dated July 3,- 1989, Clarifying Static "O": Ring Reports.  ;

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' Reference (a) requested relief from 10CFR50.72 Notification and 10CFR50.73 .

Reporting requirements of NRC IE Bulletin 86-02 regarding Static "O" Ring

_(SOR) Differential ^ Pressure Switches. Reference (b) granted approval of this

. request and, reference (c) clarified'the reporting requit;ements to a quarterly ,

summary report.

-In accordance with. reference-(b) and-(c), the attached SOR dp Switch Failure xData Sheets are enclosed for failures which occurred during the 3rd quarter of 1989. There were 2 SOR dp switch failures during this gearter.

b G.J. Diederich Station Manager LaSalle County Station

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-Enclosure c'es..NRR' Project. Manager.

NRC Region III Administrator 4

, .NRC Resident Inspector Nuclear Licensing Administrator j i

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ZCADTS/89 8910190165 891013 PDR ADOCK 05 COO 373 I} g I '

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-i SOR dp'Switth' Failure Data Sheet-

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LEquipment Piece Numbers 2B21-NO38A ' Model Number 103-AS-B212-NX-JJTTX6 i

Serial Number: 87-4-1720 l Applications Enit 2 REACTOR VESSEL _ LOW WA1ER LEVEL CONFIRMED ADS i

Date and Time of. Discovery: QB/24/89 1400 houre ,

Reactor Modes 1 (RUN) Power Levels lagh y..

Calibration Tolerances _f LA .59.4"WC l

7F Nominal Setpoint: 58.9"WC Action Limits: < 56.1 or >_blil"WC ',

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-Reject Limits . <_,5h.Q cr >_f.Lj"WC Technical Specification-Limit 114fi"WC TAs Found Setpoint: 62.3"WC

- Date and' Time of Return to Services REL11/89 2355 honts

'Model Number of. Replacement Switch: 103-AS-B112-NX-JJTTX6

- Serial Number of Replacement Switch: 89-1-1814R Causes- Snipoint Drift - cause for drift could not be determined from ingpec tion.

- Corrective Action Replaced switch and inspected failed switch. __

l Deviation Report 1-2-89-036 l J

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ZCADTS/89 l

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SOR do Switch Failure Data Shemt .

[ Eaulpment Piece Number 1E31-N012BB Model Number 103 - AS-B 203 -tiX-JJTTX6 Serial Number: 86-6-2519

. Application Unit 1 RHR SHUTDOWN ~ COOLING HIGH SUCTION FLOW ISOLATION ALARM SWITCH Date and Time of Discover'y 07/05/89 1850 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.03925e-4 months <br />

~ Reactor Mode 1 (RUN)- Power Levelt 87%

Calibration Tolerances 167.4-169.t"WC ,

Nominal Setpoints 168.4"WC

- Action Limits: cifdLa or >173.8"WC Reject Limits: <158.8 or >178.0"WC Technical Specification I Limits >/= 186.0"WC As Found Setpoint HLA_"WC Date and Time of Return to Service: 07/06/89 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> g Model Number of Replacement Switch:- 103-AS-B203-NX-JJTTX6.  ?

1 Serial' Number of Replacement Switch: 88-6-120 Cause: 1/4" rip in diaphragm between outside diameter of cylinder disk and 0-ring sealing surface.

' Corrective' Action: Replaced stritch and inspected failed switch.

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.- Deviation Report 1-1-89-063 II ZCADTS/89