ML19242A846

LER 79-073/03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc

ML19242A846
Person / Time
Site:	Davis Besse
Issue date:	08/02/1979
From:	Oneill J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19242A845	List: ML19242A844 ML19242A846
References
LER-79-073-03L, LER-79-73-3L, NUDOCS 7908060455
Download: ML19242A846 (2)

Text

J U. S. NUCLE AG T'EGUL ATORY COMMISSION

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L VENT DESCRIP'lO') nND PHOB ABLE CONSLGUENCE S h n >

lOn July 8, 1979, during a checkout of a relay in the motor operator control circuit of to Auxiliary Feed Pump Turbine 1-1 Isolation Valve",

gg l valve MS-106, "Ma in Steam Inlet valve was declared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> , placing g j jtorqued out while opening.

There was no g n .,) lthe ut.it in the action sta tement of Technical Specification 3.7.1.2.

The unit had been o r, l danger to the health and safety of the public or station personnel.

Auxiliary Feedwater (AFW) Train 1-2 was operable th ro u r,h-g]T) ghutdoun since March 31, 1979. _

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION l;IT ONE SUPPLEMENTAL INFOP3t\T10N FOR LE'1 SP-33-7 9-83 DATE OF EVENT: July 8, 1979 JACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRErE - Main Steam line to Auxiliary Feed Pump Turbine 1-1 steam inlet isolation val MS-106 failed to operate properly.

Conditions Prior to Occurrer.ce: The unit was in Mode 3, with Power (3P..T) = 0, and Load (Gross MUE) = 0.

Description of Occurrence: On July 8, 1979, during checkout of the relay in the notor operator control circuit of valve MS-106, " Main Stean Inlet to 'uxiliary Feed Punn Turbine (A FPT) 1-1 Isola t ion Valve", MS-106 torqued cut while openin;; c.nd was d.:clared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />. This placed the unit in the Action Statercat of Technical t>

Specif ir.ation 3.7.1.2 which requires two independent Auxiliary Feedwater Trains be operable in Modes 1, 2, and 3.

Designation of Appgirent Cause of Occurrence r The apparent cause of this problea is beli."'ad en h" d"o en normal we:1r of the valve in t e r na l parts wnich nade it acce s.>a t s to increase the torque switch setting slightly.

Analysis of Occurrence: There was no danger to the health and saf ety of the public or to station personnel. The unit had been shutdown since ': arch 31, 1979, and throughout this occurrence. Auxiliary Feedwater Train 2 was operable at the time of this occurroace.

Corrective Ac tion: Under Maintenance Work Order (3F.?O) 79-2461, the notor operator was removed, inspected and reinstalled. The open torque switch settira was increased from 1.9 to 2.5. The valve was stroked twice and opera ted properly However , when opera-

'dainten-tions personnel attempted to stroke the valve, it torqued eut while going closed.

ance personnel then decreased the open torque switc settin" of the valve to 2.4 and made a slight adj ustm ent to the open limit switch in order to keep it closed longer when the valve is moving of f its back seat. The valve was stroked twice against fell differential pressure and operated properly. ':5-lC'6 wa s t hen testcd per ST 5071.01, " Auxiliary Feedwater System Monthly Test", and was declared ope ra-ble on July 10, 1979. A Maintenance Work Order has been written to inspect MS-106 internally at the refueling outage.

Failure Data: A previous inoperability of valve MS-106 was reported in Licensee Event Report NP-33-79-03. This previous incident was caused by a dirt buildup on the valve stem.

LER #79-073 i : r, , n

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