ML19325D193
| 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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. LaSalle County Nucl:ar St; tion
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- Marsentes, Illinois 61341"
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- Telephone 815/357 6761 j f
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October'13, 1989-l 1
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- Director of Nuclear Reactor Regulation
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U.S. Nuclear Regulatory Commission-
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Mail Station P1-137
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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, j
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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
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I} g 8910190165 891013 I
ZCADTS/89 PDR ADOCK 05 COO 373
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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 j
-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
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ZCADTS/89 l
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SOR do Switch Failure Data Shemt
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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.
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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