05000346/LER-1978-126-03, /03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation

/03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation

ML19263C053
Person / Time
Site:	Davis Besse
Issue date:	01/26/1979
From:	Deakyne K TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19263C050	List: 05000346/LER-1978-126, Forwards LER 78-126/03L-0 05000346/LER-1978-126-03, /03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation
References
LER-78-126-03L, LER-78-126-3L, NUDOCS 7902020210
Download: ML19263C053 (3)

LER-1978-126, /03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation

Event date:
Report date:
3461978126R03 - NRC Website

text

U.S. NUCLE AR REGULATORY COMMISSION NRC FORM 366 (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORM % TION) 6 jo l1l l 0l H D B l Sl 1l@l0 l0 l-l0 l0 lN lP F l-l0 l3 @l4 l1 l1 l1 l1 @l l

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8 60 61 DOCKET NUYSER 68 63 EVENT D ATE 74 75 REPORT DATE 80 g

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lDuring the startup of the Component Cooling Water (CCIO Pump 1-1 on 12/30/78. the ener4 o

2 lator noticed that the CCW Heat Exchanger 1-1 Service Water Outlet Valve SW-1424 would I o

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4 inot open. The standby CCW Pump (1-3) was placed in service to replace CCW Pump and

[ Heat Txchanger 1-1.

No cause for the improper operation was found, and CCW Pump and I

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Heat Exchanger 1-1 was returned to service.

On 12/31/78. it was noticed that valve 1

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ISW-1424 would not maintain temnerature oroperiv. The stamibv CCW 1000 was available. I l

lThe reactor was not critical.

(NP-33-7 8-147 )

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40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l Slippage and misalignment of the valve linkage caused the actuator to function in-

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The valve was then placed in service and is j

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j TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-78-147 DATE OF EVENT: December 30, 1978 FACILITY:

Davis-Besse Unit 1 TDENTIFICAT10N OF OCCURRENCE: Component Cooling Water Heat Exchanger Service Water Outlet Valve operating improperly.

The unit was in Mode 3, with Power (MWT) = 0, and Conditions Prior to Occurrence:

Load (Gross MWE) = 0.

Cooling Description of Occurrence: On December 30, 1978 at 2242 hours0.0259 days <br />0.623 hours <br />0.00371 weeks <br />8.53081e-4 months <br />, Component the operator noticed that During the startup, Water (CCW) Pump 1-1 was started.

open.

CCW the CCW Heat Exchanger 1-1 Service Water Outlet Valve SW-1424 would not This placed the unit in the Pump 1-2 "was started and CCW Pump 1-1 was stopped. Action Statement o loops while the unit is in Modes 1 through 4.

The standby CCW loop (1-3) was lined This removed the unit from the up and placed in service to replace CCW Loop 1-1.

Action Statement of Technical Specification 3.7.3.1.

Instrument and Control personnel investigated the problem under Maintenance Work After satisfactor-No cause for the improper operation was found.

Order 1C-114-79.

ily operating valve SW-1424 both manually and automatically, it was returned to service.

1978, it was noticed that valve SW-1424 would not maintain tempera-On December 31, The valve would have opened if a safety injection had accurred, ture properly.

The cause of occurrences was dis-therefore the loop was not declared inoperable.

covered during the corrective action taken af ter the December 31 incident.

The improper operation of valve SW-1424 Designation of Apparent Cause of Occurrence:

was attributed to a possible design deficiency in the slippage and misalignment of It is believed This led to continuous oscillation of the valve.

the valve linkage.

the vibration of the actuator linkage loosens the nut retaining the two linkage arms.

There was no danger to the health and safety of the public Analysis of Occurrence:

The reactor was not or to unit personnel. The standby CCW loop was available.

critical.

79-1206, the On January 2, 1979, under Maintenance Work Order

Corrective Action

valve linkage was adjusted and calibrated. The valve was then placed in service and is being monitored for proper performance.

LER #78-126

a TOLEDO EDISON COMPNTY DAVIS-BESSE !?UCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-78-147 In order to prevent recurrence of misalignment of valve linkage, a Facility Change Request will be submitted which will request the linkage be modified to prevent vibration from loosening the nut.

There have been two previously reported occurrences of actuator Failure Data:

inoperabilities of a Service Water valve. The inoperabilities reported in Licen-see Event Report (LER) NP-33-78-120 were caused by a nut missing on the actuator and LER NP-33-78-11 was caused by a failure of a solenoid valve.

LER #78-126 4

4 4