05000346/LER-1980-082-03, /03L-0:on 801111 & 1203,control Room Operator Noticed Simultaneous Open & Closed Indication for Main Steam Isolation Warmup Valve MS100-1.Caused by Mechanical Binding of Valve.Stem Cleaned,Lubricated & Packing Loosened

/03L-0:on 801111 & 1203,control Room Operator Noticed Simultaneous Open & Closed Indication for Main Steam Isolation Warmup Valve MS100-1.Caused by Mechanical Binding of Valve.Stem Cleaned,Lubricated & Packing Loosened

ML19345D469
Person / Time
Site:	Davis Besse
Issue date:	12/11/1980
From:	Oneill J, Stotz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345D467	List: 05000346/LER-1980-082, Forwards LER 80-082/03L-0 05000346/LER-1980-082-03, /03L-0:on 801111 & 1203,control Room Operator Noticed Simultaneous Open & Closed Indication for Main Steam Isolation Warmup Valve MS100-1.Caused by Mechanical Binding of Valve.Stem Cleaned,Lubricated & Packing Loosened
References
L80-3160, LER-80-082-03L, LER-80-82-3L, NUDOCS 8012150171
Download: ML19345D469 (3)

LER-1980-082, /03L-0:on 801111 & 1203,control Room Operator Noticed Simultaneous Open & Closed Indication for Main Steam Isolation Warmup Valve MS100-1.Caused by Mechanical Binding of Valve.Stem Cleaned,Lubricated & Packing Loosened

Event date:
Report date:
3461980082R03 - NRC Website

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60 61 COCK ET NUYSER ti8 69 EVENT 0 ATE I4 75 REPORT oATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h Iol2l l(NP-33-80-104) On November 11, 1980, at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, the control room operator noticedi 1913 l la simultaneous open and closed indication for the Main Stean Isolation Warm-im l o I.: l l Valve MS100-1. This occurred again on December 3, 1980, following a recovery from a l

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNI T ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-104 DATE OF* EVENT: November 11, 1980 FACILITY:

Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Main Steam Isolation Warm-Up Valve MS-100-1 not operable.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MRT) = 1110 and Load (Gross MWE) = 338.

Description of Occurrence: On November 11, 1980, at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, a control room operator noticed that he had both the open and the closed indication for the Main Steam Isolation Warm-Up Valve MS100-1. This valve is opened prior to opening the Main Steam Isolation Valve MS100 and is then closed once MS100 is open. An operator sent to the valve confirmed the valve to be in mid-position. Attempts to close the valve from the control room were unsuccessful. Removing the air supply to the valve also failed to close it.

The valve was declared inoperable and the Station entered the action statement of Technical Specification 3.6.3.1 which The required the valve to be restored to operable or isolated within four hours.

valve was manually closed. The Technical Specification requires this containment isolation valve to be operable in Mode 1, 2, 3, and 4.

On December 3, 1980, at 1041 hours0.012 days <br />0.289 hours <br />0.00172 weeks <br />3.961005e-4 months <br />, following a recovery from a reactor / turbine trip, a control room operator noticed both the open and the closed indications for MS100-1. The valve was found in the mid-position. The valve was declared inoperable and the Station met *.he action statement "d" requirements as we were already in Hot Standby (Mode 3).

Designation of Apparent Cause of Occurrence: The cause of the failure was tne mechanical binding of the valve. A buildup of corrosion on the valve stem prevented the air actuator from being able to close the valve. The packing around the valve stem was also tight. During this past refueling outage, the packing dried out and this in combination with the stem corrosion caused the binding.

Investigation after the second occurrence verified that the valve was in mid-position.

The cause for its stopping in that position was not pinpointed. A manual assist freed the valve and it cycled open and closed without further problems.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. Valve MS100-1 is on the secondary side of the once through steam generator, and is accessible in all modes and can be manually closed.

LER #80-082 i

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT OME SUPPLEMENTAL INFORMATION FOR LER NP-33-80-104 Page 2

Corrective Action

Under Maintenance Work Order 3821, the stem of MS100-1 was cleaned, lubricated, and the packing was loosened. The valve was successfully stroke time tested at 0133 hours0.00154 days <br />0.0369 hours <br />2.199074e-4 weeks <br />5.06065e-5 months <br /> on November 13, 1980. This removed the Station from the action statenent.

After the second event the valve was closed with a manual assist. The valve was then cycled open and closed successfully. It was declared operable at 1807 hours0.0209 days <br />0.502 hours <br />0.00299 weeks <br />6.875635e-4 months <br /> on December 3, 1980. Maintenance Work Order 80-3945 will check the valve internals and replace the packing during the next Mode 5 outage.

Failure Data: There have been no previous reports of failures of the main steam line isolation warm-up valves.

LER #80-082 O

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