ML20027A350

LER 78-105/03L-0:on 781021,during Surveillance Testing, Control Room Emergency Ventilation Sys Isolation Damper HV-5301A Would Not Close.Caused by Dirt on Sealing Surface & Seals Needing Lubrication.Damper Seals Cleaned & Lubricated

ML20027A350
Person / Time
Site:	Davis Besse
Issue date:	11/15/1978
From:	Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027A349	List: ML20027A348 ML20027A350
References
LER-78-105-03L, LER-78-105-3L, NUDOCS 7811200212
Download: ML20027A350 (3)

Text

U. S. NUCLE AR REGULATORY COMMISSION FORM *. A (747) *

• LICENSEE EVENT REPORT l-CONTROL BLOCK: l l l l l l e

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l j

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60 63 DOCK ET NUYSER bd

? 8 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h io l2l l During the performance of surveillance testing at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on October 21, 1978, it l go g3; l was discovered that Control Room Emergency Ventilation System (EVS) Isolation Damper l 1

J o 14 j l HV-5301A would not close. Since the unit was in Mode 5 at the time of the occurrence,l t o i s j l no action statement was entered. This report is being submitted as documentation of l I o is l l a component failure. There was no danger to the health and safety of the public or toj  !

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j o l 7 l l unit personnel. The redundant isolation damper HV-5311A did close as required. l l

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(NP-33-78-123) 80 7 . 9 DE CODE SUSC E COYPONENT CODE SUSC DE 5 005 lo19l 8 9 l Al Al@ l El@ l B l@ lV l A lL lV lE lX l@ ] Ll@ ]@

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CCCU R RE NCE REPORT REVislON SEQUENTIAL REPORT NO. CODE TYPE LER EVENT YEAR

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Aj g lP ( 8 ACTl1 lS lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l 3 ; o l l Inspection revealed dirt on the sealing surface and the seals were in need of lubri- l ,

j,,ijl cation. The damper seats were cleaned and the damper seals were lubricated. The l

damper was stroked and preper operation verified. The damper was not cleaned and l l lubricated thoroughly diarly1 preventative maintenance. This will be stressed in l l

,,,,,, l future work order instructions. 80 7 8 9

% POWER OTHERSTATUS ISCO RY DISCOVtRY DESCP'PTION STA S ST 5032.01 l l1 15ll Gl@ l d Ol d' hlNA "

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• PERsONsEL ExPosubEs NUY8ER TYPE DE SCRIPTION I

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,ERsONNEL N,u'JiEs Nov ER oEsCRiPTios@ I NA LWJ8 l9 0101 Ol@l12 7 11 80 LOSS OF OR DAVAGE To F ACILITv TYPE CESCRieTION l

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D l ol LyJ81 NA 7811oo0afA ~ i 68 69 yii w ii;il[3 60 3 7 3 0 10 JVR 78-159 NAME OF PREPARER John P. Martiaan PHONE- 410 ' *9 - 5 'in" ' ' - " - ' 'i l

' TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-123 DATE OF EVENT: October 21, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Control Room Emergency Ventilation System Damper would not close a

i Conditions Prior to Occurrence _: The unit was in Mode 5, with Power (MWT) = 0, and Load (MWE) = 0.

Description of Occurrence: During the performance of ST 5032.01, ' Monthly Func-tional Test of the Radiation Monitoring System", at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on October 21, 1978, it was discovered that Control Room Emergency Ventilation System (EVS) Iso-

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lation Damper HV-5301A would not close.

Technical Specification 3.7.6.1 requires two independent Control Room EVS to be operable while the unit is in Modes 1 through 4 Since the unit was in Mode 5 at the time of the occurrence, no action statement was entered. This report is being subnitted as documentation of a component failure.

Designation of Apparent Cause of Occurrence: Inspection of the damper HV-5301A revealed dirt on the sesling surf ace and the seals were in need of lubrication.

These dampers are inspected and cleaned semi-annually per a preventative mainten-ance work order.

Analysis of Occurrence: There was no danger to the health and safety of the public g-or unit personnel. The redundant isolation damper HV-5311A did close as required.

The unit was in Mode 5 at the time of the occurrence.

Corrective Action: Under Maintenance Work Order 78-2476, the damper seats were cicaned and the damper scals were lubricated with silicone spray. The damper was

(

i stroked and proper operation verified. Surveillance Test ST 5032.01 was performed on October 24, 1978, and the damper operated properly.

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It is believed the frequency of the maintenance is adequate, but the damper was not cleaned and lubricated thoroughly. This will be stressed in future work order instructions.

The remaining safety related dampers will be re-inspected, cleaned, and lubricated if required.

LER #78-105 l

TOLEDO EDISON COMPANY DAVIS-BESSE U'ilT ONE NUCLEAR PO!iER STATION PAGE 2 SUPPLEME!.TAL INFORMATION FOR LER NP-33-78-123 Failure Data: This is the second occurrence or an EVS damper being inoperable due to dirt / lubrication deficiencies. See Licensee Event, Report NP-33-77-95.

LER #78-105 1

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