05000346/LER-1980-035-03, /03L-0:on 800410,while Attempting to Switch from Decay Heat Removal Train 1 to Train 2,cooler 2 Outlet Valve Would Not Open.Caused by Malfunctioning of Valve Operator Radial Arm.Radial Arm Was Readjusted

/03L-0:on 800410,while Attempting to Switch from Decay Heat Removal Train 1 to Train 2,cooler 2 Outlet Valve Would Not Open.Caused by Malfunctioning of Valve Operator Radial Arm.Radial Arm Was Readjusted

ML19323B483
Person / Time
Site:	Davis Besse
Issue date:	05/07/1980
From:	Makatura L TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19323B481	List: 05000346/LER-1980-035, Forwards LER 80-035/O3L-0 05000346/LER-1980-035-03, /03L-0:on 800410,while Attempting to Switch from Decay Heat Removal Train 1 to Train 2,cooler 2 Outlet Valve Would Not Open.Caused by Malfunctioning of Valve Operator Radial Arm.Radial Arm Was Readjusted
References
LER-80-035-03L, LER-80-35-3L, NUDOCS 8005120429
Download: ML19323B483 (2)

LER-1980-035, /03L-0:on 800410,while Attempting to Switch from Decay Heat Removal Train 1 to Train 2,cooler 2 Outlet Valve Would Not Open.Caused by Malfunctioning of Valve Operator Radial Arm.Radial Arm Was Readjusted

Event date:
Report date:
3461980035R03 - NRC Website

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19 l 2 l l(NP-33-80-43) on 4/10/80 at let Valve DH14A would not open l j o j 3 l lcoval (DUR) Train #1 to DHR Train #2, DHR Cooler #2 Out Train #1 was returned to service and Train #2 was declared inoperable.

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j o l s ; lThe station was in Mode 5 at lo lc l l statement of Technical Specification 3.5.2 which requires both DHR trains to be o There was no danger to the health and safety of the public l ling in Modes 1, 2, and 3.

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DHR Train #1 was operating properly.

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40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1: lo l lThe cause of the occurrence can be traced to the radial arm of the valve operat The arm works in a very narrow area and it moved slightly sideways where it made I l,;,jl age.

in its meunting bracket. This restricted its movement to only 20%. l l contact with a bolt

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g,,.,j lUnder W O 328-80, the radius arm was readjusted.

Toledo Edison is investigating need for further corrections.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-43

'l DATE OF EVENT: April 10, 1980 FACILITY: Davis-Besse Unit 1 Decay Heat Removal Cooler #2 outlet flow control valve IDENTIFICATION OF OCCURRENCE:

DH14A would not open beyond 20%

The unit was in Mode 5, with Power (MRT) = 0, and Conditions Prior to Occurrence:

Load (Gross MWE) = 0.

i On April 10, 1980 at 1129 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.295845e-4 months <br /> while attempting to Description of Occurrence:

switch to #2 Decay Heat Removal Train for maintenance on #1, DH14A would not open Technical Specification 3.5.2.c requires two independent emergency beyond 20%.

Being core cooling systems (ECCS) subsystem to be operabic in Modes 1, 2, and 3.

This event is being reported in Mode 5, the unit did not enter the action statement.

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to document a component failure.

i The improper operation of valve DH14A l

Designation of Apparent Cause of Occurrence:

failure.

The proximity of the radius ara can be attributed to a nochanical component to the bracket mounting bolts allows only marginal clearance. Any movement of the of the radius arm towards the mounting bracket causes binding and limits movement radius arm.

3 There was no danger to the health and safety of the public I

. Analysis of Occurrence:

or to station personnel.

The #1 Decay Heat Removal train was operable during this time.

Under Maintenance Work Order IC-328-80, the radius arm on the d

Corrective Action

valve shaf t was moved away from the mounting bracket, thus providing clearance and allowing the valve to stroke fully. After meeting stroke time acceptance criteria required by Surveillance Test ST 5051.01, the valve was declared operable and returned I

to service on April 11, 1980 at 0750 hours0.00868 days <br />0.208 hours <br />0.00124 weeks <br />2.85375e-4 months <br />.

Toledo Edison is investigating further 4

corrective action that may be required on this or other similar valves.

There have been no previously reported failures of this type valve Failure Data:

l operator.

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LER #80-035 i

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