05000346/LER-1980-002-03, /03L-0:on 800103,after Actuating of Safety Features Actuation Sys Level 2,demin Water Valve DW68318 Did Not Indicate Closed & Monitor Light Did Not Indicate Properly.Caused by Maladjusted Position Indicator Switch

/03L-0:on 800103,after Actuating of Safety Features Actuation Sys Level 2,demin Water Valve DW68318 Did Not Indicate Closed & Monitor Light Did Not Indicate Properly.Caused by Maladjusted Position Indicator Switch

ML19257D415
Person / Time
Site:	Davis Besse
Issue date:	01/30/1980
From:	Hill B TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19257D412	List: 05000346/LER-1980-002, Forwards LER 80-002/03L-0 05000346/LER-1980-002-03, /03L-0:on 800103,after Actuating of Safety Features Actuation Sys Level 2,demin Water Valve DW68318 Did Not Indicate Closed & Monitor Light Did Not Indicate Properly.Caused by Maladjusted Position Indicator Switch
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002040345
Download: ML19257D415 (2)

LER-1980-002, /03L-0:on 800103,after Actuating of Safety Features Actuation Sys Level 2,demin Water Valve DW68318 Did Not Indicate Closed & Monitor Light Did Not Indicate Properly.Caused by Maladjusted Position Indicator Switch

Event date:
Report date:
3461980002R03 - NRC Website

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69 EVENT DATE 14 75 REPORT DAT E 30 EVENT DESCRIPTION AND PRCBABLE CONSEQUENCES h o 2 l On January 3, 1980 at 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> following an actuation of Safety Features Actuation l o

3 l System (SFAS) level 2, it was discovered that demin water valve DW6831B did not indi-l l cate closed, and its safety actuation monitor (SAM) light was not indicating properly.l o

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLE}UNTAL INFORMATION FLR LER NP-33-80-01 DATE OF EVENT: January 3, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Failure of close indication of Containment Isolation Valve DW6831B The unit was in Mode 3, with Power (MWT) = 0, and Conditions Prior to Occurrence:

Load (Gross MWE) = 0.

Description of Occurrence: At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on January 3, 1980 following an actuation of Saf ety Features Actuation System (SFAS) level 2, it was discovered that DW6831B indi-did not indicate closed, and its safety actuation monitor (SAM) light was not cating properly. The valve was cycled from the control room but the closed light did not come on.

DW6831B was declared inoperable, and the unit entered the action statement of Technical Specification 3.6.3.1 (action d), which required the plant to be in hot standby. The plant was in hot standby at the time of the occurrence.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was that i

the close limit switch on DW6831B had gotten out of proper adjustment, The locking nut on the actuator bolt was found to be loose.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel.

Containment Isolation Valve DW6831A which is in series with DW6831B did go closed on receipt of this safety actuation signal.

Corrective Action

Under Maintenance Work Order IC 200-80, the close limit switch for DW6831B was properly adjusted. The valve was cycled from the control room, and the close indication and the SAM light indicated properly. At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> on Janu-ary 3, 1980, thr. valve was declared operable removing the unit from the action statement of Technical Specification 3.6.3.1.

Failure Data: There are no previous failures of this type.

LER #80-002 i865"172