05000346/LER-1979-003-03, /03L-0 on 790104:control Room Emergency Ventilation Sys Damper HV5311E Inoperable.Caused by Leaking Pneumatic Operator.New Operator Installed.Damper Operated & Tested for Response Time & Declared Operable

/03L-0 on 790104:control Room Emergency Ventilation Sys Damper HV5311E Inoperable.Caused by Leaking Pneumatic Operator.New Operator Installed.Damper Operated & Tested for Response Time & Declared Operable

ML19270F383
Person / Time
Site:	Davis Besse
Issue date:	01/31/1979
From:	Rudolph J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19270F382	List: 05000346/LER-1979-003, Forwards LER 79-003/03L-0 05000346/LER-1979-003-03, /03L-0 on 790104:control Room Emergency Ventilation Sys Damper HV5311E Inoperable.Caused by Leaking Pneumatic Operator.New Operator Installed.Damper Operated & Tested for Response Time & Declared Operable
References
LER-79-003-03L, LER-79-3-3L, NP-33-79-04, NP-33-79-4, NUDOCS 7902060332
Download: ML19270F383 (2)

LER-1979-003, /03L-0 on 790104:control Room Emergency Ventilation Sys Damper HV5311E Inoperable.Caused by Leaking Pneumatic Operator.New Operator Installed.Damper Operated & Tested for Response Time & Declared Operable

Event date:
Report date:
3461979003R03 - NRC Website

text

U.S. NUCLE AR REGUL ATORY COMMISSloN NRC FORM 366 C 77)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 21 1At 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on 1/4/79, Control Room Emergency Ventilation System (EVS) Damper HV5311t 10131 lvas declared inoperable. Surveillance testing had determined a deficiency existed.

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failure. There was no danger grence is being reported as documentation of a component gogg; g p ;to the health and safety of the public or unit personnel. The failure of this damper l The subject damper gol7l ldid not render either train of the Control Room EVS inoperable.

is redundant in the 'ontrol Room EVS train.

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damper was operated and tested for response time.

The damper was declared operable j i I 2 J l at approximately 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on 1/12/79. All other Control Roca EVS operators iia l similar to the one that failed have been inspected.

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I TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFOP3!ATION FOR LER NP-33-79-04 DATE OF EVENT: January 4,1979 FACILITY:

Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Control Roca Emergency Ventilation System (EVS) Damper HV5311E rendered inoperable Conditions Prior to Occurrence: The unit was in Mode 1, vith Power (WIT) = 2750, and Load (Gross MWE) = 920.

Description of Occurrence:

At 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> on January 4,1979, Control Roca EVS Damper h/5311E was declared inoperable. The techanical control linkage for HV5311E, the suction damper for noraal Control Room Ventilation Fans, was disconnected, and the damper blocked open to maintain Control Roon ventilation pending cylinder repair or replacement of the co=ple te mechanism. The failure was detected by a power plant repairman who was investigating the cause of suspended Surveillance Test ST 5032.01,

" Monthly Functional Test of the Radiation Monitoring Systen".

This occurrence is being reported as documentation of a component failure.

i Designation of Apparent Cause of Occurrence:

The pneucatic operator for IIV5311E was found to be leaking, therefore rendering insufficient service to the subj ect damper.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The f ailure of this damper did not render either train of the Control Room EVS inoperable. The subject danper is redundant in the Control Room EVS train.

Corrective Action

A new operator was installed per Maintenance Work Order 79-1193.

i The damper was operated and tested for response time per ST 5076.03, " Control Room EV3 Refueling Test".

The danper was declared operable at approximately 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on January 12, 1979. All other Control Roca EVS operators similar to the one that failed have been inspected for cylinder leakage and none were reported to be leaking.

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Failure Data: There have been no previous similar reportable occurrences of an EVS l

damper recoved from service due to pneumatic operator trouble.

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f LER #79-003