ML20027A372

LER 78-024/03L-1:on 780228,MSIV MS-101 Rendered Inoperable to Allow Maint Personnel to Remove Raised Metal on Two of Four Spring Guide Tubes.Cause of Raised Metal Unknown.Metal Filed Down,Valve Closing Time Adjusted & Valve Tested

ML20027A372
Person / Time
Site:	Davis Besse
Issue date:	03/27/1978
From:	David Brown TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027A363	List: ML20027A362 ML20027A365 ML20027A366 ML20027A367 ML20027A369 ML20027A372
References
LER-78-024-03L, LER-78-24-3L, NP-33-78-27, NUDOCS 7811210374
Download: ML20027A372 (3)

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RTI} l At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on February '

g ; inc,perable to allow Maintenance to remove raised =etal on two of four l

tubes. Rendering the valve inoperable placed the unit in the Action Statement of 6 FT'i1 I There was no danger to the health and l [

go,3,- [ Technical Specifications 3.6.3.1 and 3.7.1.5 The unit was in Hot Standby conditions dur- g i'

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g l The Containment Isolation Valve Post Maintenance Test was succe 28, 1978. l so g 1 the valve declared operable at 1355 hours0.0157 days <br />0.376 hours <br />0.00224 weeks <br />5.155775e-4 months <br /> on February 7 es t$ 0 RY DISCOVERY DESCRIPTICN

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I TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POUER STATION SUPPLEMENTAL INFORMATION -FOR LER NP-33-78-27 DATE OF EVENT: February 28, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Main Steam Isolation Valve (MSIV) MS 101 rendered inoperable.

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

Load (MWE) = 0.

At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on February 28, 1978, MSIV MS101 was Descrintion of Occurrence:

rendered inoperable to allow Maintenance to remove raised metal on two of four spring guide tubes. Raised metal was observed on spring guide tubes on February 27, 1978, after valve was opened following a plant trip on February 24, 1978.

Rendering the valve inoperable placed the unit in the Action Statement of Techni-cal Specification 3.6.3.1 uhich requires all containment isolation valves to be operable in Modes 1, 2, 3 and 4 and Technical Specification 3.7.1.5 which requires both MSIVs to be operable in Modes 1, 2 and 3.

Designation of Anoarent Cause of Occurrence: The MSIV was removed from service to allow maintenance on the spring guide tubes. This was done to assure continued proper operation of the MSIV. The cause of raised metal is not known.

There was no danger to the health and safety of the public Analysis of Occurrence:The or to unit personnel. unit was in Hot Standby conditions during the performance of the activity. After completion of the repair, the reactor was taken critical at 1551 hours0.018 days <br />0.431 hours <br />0.00256 weeks <br />5.901555e-4 months <br /> on February 28, 1978.

Corrective Action: The raised metal was filed down and the guide tubes polished with an abrasive wheel and lubricated with FELPRO N1000 per Maintenance Work "Order 5064.01, Con-78-503. The valve was operated and tested per Surveillance Test ST tainment Isolation Valve Post Maintenance Test".

The initial closing time exceeded the allowable closing time of five seconds of Technical Specifications 3.6.3.1 and 3.7.1.5. Maintenance Work Order IC 235-78 Surveillance Test ST 5064.01 adjusted closing time speed to less than five seconds.

was successfully re-run and the valve declared operable at 1355 hours0.0157 days <br />0.376 hours <br />0.00224 weeks <br />5.155775e-4 months <br /> on February 28, 1978, removing the unit from the Action Statement of Technical Specifications 3.6.3.1 and 3.7.1.5.

LER #78-024

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TOLEDO EDISON COMPANY ,

's DAVIS-BESSE UNIT ONE UUCLEAR POWER STATION PAGE 2 i.

SUPPLEMENTAL INFORMATION FOR LER NP-33-78-27 Rockwell International (the valve vendor) representatives inspected the valve on March 1, 1978. Rockwell International recommended changing the original carbon steel guide tubes to aluminum bronze guide tubes to prevent the possibility of ',

galling of the spring tubes. 1 '

on July 7,1978, work was completed which removed the original carbon steel guide tubes and replaced them with guide tubes of aluminum bronze on MSIVs MS 100 and MS 101. This change was made per Facility Change Request 78-184 at the recem- s

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mendation of the valve vendor, Rockwell International, and with the assistance of one of their representatives. All materials were provided by Rockwell.

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Failure Data: There have been no previous similar reportable occurrences of an MSIV removed frcm operability to remove raised metal.

1 LER #78-024 .

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