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{{#Wiki_filter:U. S. NUCLE AR REGUL ATo81Y COMMISSloN NRC FORM 306 U 77)
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LICENSEE EVENT REPORT
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l TOLEDO EDISO:: COMPA'iY                                                                  I DAVIS-EESSE !!UCLEAR P0b'ER STATIO: I";IT 0 JE SUPPLEME::TAL I:;FOR:tATIO:i FOR LER !!P-33-79 -74                                PAGE 2 5 Event Report :;P-33-78-ll was caused by a failure of a solenoid valve, and Licensee Even t Report ! P- 33-78-147 was caused by vibrations loosening the bolt retaining the two linkage arns.
l TOLEDO EDISO:: COMPA'iY                                                                  I DAVIS-EESSE !!UCLEAR P0b'ER STATIO: I";IT 0 JE SUPPLEME::TAL I:;FOR:tATIO:i FOR LER !!P-33-79 -74                                PAGE 2 5 Event Report :;P-33-78-ll was caused by a failure of a solenoid valve, and Licensee Even t Report ! P- 33-78-147 was caused by vibrations loosening the bolt retaining the two linkage arns.
LER #79-068 s
LER #79-068 s
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Latest revision as of 02:54, 2 February 2020

LER 79-068/03L-0 on 790623:during Performance of Svc Water Sys Monthly Test ST 5075.01,component Cooling Water Heat Exchanger 1-3 Outlet Valve Failed to Close Fully.Caused by Vibrational Loosening of Retaining Nut
ML19242A144
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 07/19/1979
From: Deakyne K
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19242A141 List:
References
LER-79-068-03L, LER-79-68-3L, NUDOCS 7907310373
Download: ML19242A144 (3)


Text

U. S. NUCLE AR REGUL ATo81Y COMMISSloN NRC FORM 306 U 77)

LICENSEE EVENT REPORT CONTHOL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED !NFORMAllON) 1 6 Io i l Ol 11 D jB lS l1 @l0l0 l 0 0 Nl P! F -

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EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h oi2 l On June 23, 1979, at 0355 hours0.00411 days <br />0.0986 hours <br />5.869709e-4 weeks <br />1.350775e-4 months <br /> during the performance of the Service Water (SW) SYs-1

o i l ten Monthly Test ST 5075.01, it was found that SW 1429, the Component Cooling Water I o . l (CCW) llea t Exchanger 1-3 SW Outlet Valve, f ailed to consistently go to the f u l lv__c_Innj d po s i t io n. As the unit was in Mode 5 at the ti
,e of the occurrence, no action state- I
g ;s y o 6 l ment was applicable. This report is being submitted as documentation of a comganent 1 0 7 l failure. There was no danger to the health and sa.ety of the public or station per- l lo a l sonnel. There were two loops of CCW available for operation at the time of occurroned. n 8 9 7

SYST E M C AUS E CAUSE COYPONENT CcDE C O*.' P SUCCODE VALVE SUBuCCE (SP-33 74)

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EVENT (E AR LE R

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33 24 a R cAUSE DESCRIP TION AND CORRECTIVE ACTIONS h i o l Slippage and misalign-ent of the valve linkage of 5414;9 was due to a vibrational ji I,j loosening of a retaining nut. A visual iTisnection of the service water outlet valverI i, 7 l on all three CCW heat exchangers was made and ,alve SW 1424 was realiened and recali-1 l brated in addition'to SW 1429 as a precautiona y mersure. Previously nrenared Faci- l i 3 yil4; l lity Change Request 79-151 ..a s ?plemented_c i al l three valves to nrevent r e en t r e n c e ._.] "

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METHOD OF F ActLITY 015CO VE H Y DISCU /f RY DESCH'P TION n STATUS NPOAEH OTHE R ST ATUS l

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e TOLEDO EDIS05 CO."PANY DAVIS-EESSE NULLEAR POUER STATION UNIT ONE SUPPLEMENTAL INFOR'uTION FOR LER NP-33-79-74 DAT'i 0F EVENT: June 23, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Component Cooling Uater Heat Exchanger 1-3 Service Water Outlet Valve SW 1429 operating imptcperly Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MUT) = 0, and Load (Gross MWE) = 0.

Description of occu ence: On June 23, 1979, at 0355 hours0.00411 days <br />0.0986 hours <br />5.869709e-4 weeks <br />1.350775e-4 months <br />, during the perf ormance of Service Uater Systen Monthly Surveillance Test ST 5075.01, SW 1429, Conponent Cool ing Uater (CCU) Heat Exchanger 1-3 Service Water (SU) Outlo- Valve failed to consistently provide a close indication. Visual inspection revealed the valve was not going to the fully closed position. The operator suspeneded the surveillance test, and submitted a work request. As the unit was in Mode 5 at the t:.me of the occurrence, no action statement was ,+11 cable. This report is being submitted as documentation of a com-ponent failure.

Designation of Apparent Cause of Occurrence: ine improper operation of valve 5W 1429 was attributed to slippaae and misalignment oi the valve linkage. This was caused by a design deficiency which allowed vibrations to 1 cosen the bolt that re ta ins the twc linkage anns tecether.

Analysis of Occurrence: There was no dangc_ to the health and saf ety of the public or station personnel. There were two loops of component cooling water available for opera-tion at the time of occurrence.

Corrective Action: ' The valve linkage was realigned and calibrated under Maintenance Work Order IC-309-79. As a precautionary measure, the linkage for SU 1424, CCU Heat Exchanger 1-1 SU Outlet Valve, uas recalibrated under the same maintenance work order.

A visual inspection of T. 1434, CCW Heat Exchanger 1-2 SW Outlet Valve, was performed and it was determined that recalibration would not be necessary due to a recent cali-bration performed on April 4, 1979 under Maintenance Work Order IC-223-79.

The applicable sections of ST 5075.J1 vere successfully performed to verify the opera-bility of the valves. On July 3, 1979 implementation of previously prepared Facility Change Request (FCR)79-151 was completed. This FCR modified the linkages to prevent vibrations f rom loosening the retaining bolt on all three valves.

Failure Data: There have been three previously reported occurrences of actuator inoperabilities of a service water valve. The inoperabilities reported in Licensee Event Report NP-33-78-120 were caused by a nut missing on the actuator. Licensee LER #79-068

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l TOLEDO EDISO:: COMPA'iY I DAVIS-EESSE !!UCLEAR P0b'ER STATIO: I";IT 0 JE SUPPLEME::TAL I:;FOR:tATIO:i FOR LER !!P-33-79 -74 PAGE 2 5 Event Report :;P-33-78-ll was caused by a failure of a solenoid valve, and Licensee Even t Report ! P- 33-78-147 was caused by vibrations loosening the bolt retaining the two linkage arns.

LER #79-068 s

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