ML20028C123

LER 82-064/03L-0:on 821129,decay Heat Cooler Component Cooling Water Outlet Valve on CCW Train 1 Would Not Open. Caused by Mfg Error.Flanged Bearing Missing from Actuator Mounting Plate.Flanged Bearing Installed on 821215

ML20028C123
Person / Time
Site:	Davis Besse
Issue date:	01/03/1983
From:	Isley T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C122	List: ML20028C121 ML20028C123
References
LER-82-064-03L, LER-82-64-3L, NUDOCS 8301070081
Download: ML20028C123 (2)

Text

NRC FORM ';66 U. S. NUCLEAR REGULATORY COMMISSION ig77)>

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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[OTTl 10 l LICENSEE H I D CODE I B I S1411 15l@l 010 l- 10LICENSE le leNUMBER le le l le le 25l@l411111111 26 LICENSE TYPE JO l@l57 CATI 53 l@

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REPORT DATE 7 8 60 61 DOCKET NUMBER 66 EVENT OATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0 lal l (NP-33-82-79) On 11/29/82 at 0920 hours0.0106 days <br />0.256 hours <br />0.00152 weeks <br />3.5006e-4 months <br />, while performing ST 5074.01 on Component l g ; Cooling Water (CCW) Train 1, operators discovered that CC1467 Decay Heat Cooler CCW l 1 o 14 l 10 utlet Valve would not open. Decay Heat Train 1 was declared inoperable, and the unit l I There was no danger I O l s i l entered the action statement of Technical Specification 3.5.2. l

[TT;q lco the health and safety of the public or station personnel. Decay Heat Train 2 was l lol7j joperable and available to provide core cooling. (

I Lo_L.J l 7 8 9 E S SC E COMPONENT CODE SUSCOdE S E

@ lC lF lg l Bl@ l V j Al Ll Vl 0 l P jg lD lg lZ lg 18 19 20 7 8 9 10 12 13 SEQUENTIAL OCCURRENCE REPORT REVISION

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41 l N lg 42 Wg 43 l H l 0 l 3 l 5 lg 44 47 33 I CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS 27 l ,1iIOIlThe cause is manufacturing error. On 11/30/82 the valve actuator was inspected, and a l l

Iflanged bearing was found missing from the actuator mounting plate. CC1467 was placedI

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g lin the open position with the air isolated. Decay Heat Train 1 was declared operable l On 12/15/82, I l g jon 11/30/82 at 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br />, removing the unit from the action statement.

l [yITl la flanged bearing was installed in CC1467 under Maintenance Work Order IC-661-82. l 80

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OTHER ST'ATUS Di O RY DISCOVERY DESCRIPTION 32 y lE l@ l 0l' 9l 9l@l NA "

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L DVR'82-149 NAME OF PREPARER Tom Isley _ _

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TOLEDO EDISON COMPANY -

' DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE' v'

SUPPLEMENTAL INFORMATION FOR LER NP-33-82-79

, r DATE OF EVENT

November 29, 1982 -

1. ~

l FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Decay Heat Cooler 1- 1 Component Cooling

! Water Outlet Valve etuck closed ,

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{ Conditions Prior to Occurrende: The unit was in Mode 1, with Power ,

l (MWT) = 2740 and Load (Gross MWE) = 914 '

Description of Occurrence: On November 29, 1982 at 0920 hours0.0106 days <br />0.256 hours <br />0.00152 weeks <br />3.5006e-4 months <br />', while ,

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performing Surveillance Test ST 5074.01 on Component Cooling Water (CCW) '

Train 1 the operators discovered that CC1467 (Decay Heat Cooler 1-1 CCW Outlet Valve) would not open. Decay Heat Train I was declared inoperable,

~~

and the unit entered the action statement of Technical Specification 3.5.2, which requires the inoperable train to be restored to operable ,

, status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in Hot Shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

.j Designation of Apparent Cause of Occurrence: The apparent cause is a

! manufacturing error. On November 29, 1982, Instrument and Control.(I&C) mechanics found the actuator shaf t to be bent, and the actuator was bound up. Under Maintenance Work Order IC-661-82, the actuator was disassembled, inspected, and reassembled with a new actuator shaft installed. On.

November 30, 1982, engineering and station personnel inspected the valve actuator and by comparing it with the actuator for CC1496, Decay Heat Cooler 1-2 CCW Outlet Valve, discovered that a flanged bearing was missing from the actuator mounting plate. When the bearing was removed or lost cannot be determined. ,

Analysis of Occurrence _

There was no danger to the health and safety of

the publi

ur station persennel. Decay Heat Train 2 was operable and available to provide core cooling.

Corrective Action: CC1467 was placed in the open position with the air l 1sclated, and Decay Heat Train 1 was declared operable on November 30,

)

1982 et 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br />, removing the unit from the action statement of Techni-cal Specification 3.5.2. On December 15, 1982, a new flanged bearing was installed in CC1467 under Maintenanca Work Order IC-661-82. CC1467 was then tested per Surveillance Test ST 5074.01, Section 8, and declared j operable at 1540 hours0.0178 days <br />0.428 hours <br />0.00255 weeks <br />5.8597e-4 months <br /> on December 15, 1982. To insure that the flanged bearing is properly installed, Maintenance Instruction 11-803 has been written to provide maintenance guidelines on CC1467 and CC1469.

Failure Data

Previous failures of CC1467 to open have been reported in Licensee Event Reports NP-33-79-114 (79-098) and NP-33-79-145 (79-125).

LER #82-064 i

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