ML19257D415

LER 80-002/03L-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

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: ML19257D411 ML19257D415
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002040345
Download: ML19257D415 (2)

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LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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14 75 REPORT DAT E 30 i t,J DOCK ET NU".*B E R 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 o 4 l cate closed, and its safety actuation monitor (SAM) light was not indicating properly.l c s l DW6831 was declared inoperable, and the unit entered the action statement of T.S. l o c l 3.6.3.1. The unit was still in hot standby at the time of the occurrence. There was ;

o 7 I no danger to the health and safety of the public or station personnel. Its redundant l o a 1 isolation valve DW6831A did close on receipt of this safety actuation signal. j 7 8 9 (ht'-3 3-b O-01) EO SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SU9 CODE COMPONENT CODE SUBCODE SU2CCOE 7

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43 l44N l 0 l1 l 475 lh CAUSE DESCRIPTION AND CORRECTIVE ACTIONS of i o l The cause of the occurrence was that the position indication switch was found out g l jil adjustment. The locking nut on the actuator bolt was found to be loose. Under : fain ,

i 2 l tenance Work Order IC-200-80, this close limit switch for DW6831B was properly )

!i , [ adjusted. At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> on January 3, l'980, the valve was declared operable, removing;

_ liI4I 8I 9the unit from the action statement.

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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 Conditions Prior to Occurrence: The unit was in Mode 3, with Power (MWT) = 0, and 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 did not indicate closed, and its safety actuation monitor (SAM) light was not indi-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.

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

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