ML19338E611

LER 80-068/03L-0:on 800901,all Indicators for Meteorological Instrumentation Failed.Caused by Lightning Striking Tower, Resulting in High Voltage Spike in Wind Direction Sensor. Repairs to Tower Sensors and Comstar Computer Completed

ML19338E611
Person / Time
Site:	Davis Besse
Issue date:	09/29/1980
From:	Eldred D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19338E608	List: ML19338E607 ML19338E611
References
LER-80-068-03L, LER-80-68-3L, NUDOCS 8010030451
Download: ML19338E611 (2)

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k 60 61 DOCKET NUM8ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h FIT 1 I(NF-33-80-81) Cn 9/1/80 at 2033 hours0.0235 days <br />0.565 hours <br />0.00336 weeks <br />7.735565e-4 months <br /> a?1 control room (CTRM) and emergency control I On I g l center (ECC) indication for meteorological instrumentation was discovered out.

l 9/2/80 at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> the 340' wind direction sensor was also found inoperable. The I o 4 g l action statement of T.S. 3.3.3.4 was not entered as the indication was restored wf'*in l

oe l7 days. This event is being reported to document a component failure. There was no I o 7 jdf .nger to the public or station personnel. Instrumentation readout was still availablel I

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44 3J JP CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g IIt appears that lightning struck the tower causine a hich voltane spike in the 340' windI  !

This voltage spike was transmitted through the nyntem cmm% e-h a l i i Idirection sensor.

g g omstar C computer to fail. This in turn caused the cessation of transmission of data tol g lthe CTRM and ECC. Repairs were made to the 340' wind direction sensor on 9/3/80 and toi

, , gthe Comstar computer on 9/5/80. l l 80 l 7 8 9 ST S  % POWE R OTHER STATUS DIS O RY DISCOVERY OESCRIPTION i 5 b@ l 6 l 6 l 6 lgl NA l l B [gl Control Room Inspection l A!TiviTv CO0 TENT P E Lt ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7

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• TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-81 i

i DATE OF EVENT: S?ptemt;r 1, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Meteorological instrumentation readout was lost in the Conttol Room and in the Emergency Control Center 1

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

Description of Occurrence: At 2033 hours0.0235 days <br />0.565 hours <br />0.00336 weeks <br />7.735565e-4 months <br /> on September 1, 1980, all Control Room and Emergency Control Center indications for meteorological instrumentation were lost.

This was discovered by the Control Room Operator on a Control Room inspection. An operator was dispatched to the Emergency Control Center and the Meteorological Tower cheiter. He verified no instrument readout in the Emergency Control Center and that these instruments in the Meteorological Tower ware operable. At 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> on Septem-b:r 2,1980, the Instrument and Control Mechanic also discovered that the 340 foot wind direction sensor was also inoperable. NUS Corporation was notified, and their ccryiceman came on site ca September 3 to effect repairs. +

The action statement of Technical Specification 3.3.3.4 was not entered as the indica-tion was restored to operable within the seven day period. However, this event is b:ing reported to document a component failure.

Designation of Apparent Cause of Occurrence: It appears that lightning struck the . l tcwer causing a high voltage spike in the 340 foot wind direction sensor. This voltage Epike was transmitted through the system and caused a failure of three cards in the  !

Comstar computer. The failure of the Comstar computer caused the cessation of trans- {

nission of data to the Control Room and Emergency Control Center. {

l Analysis of Occurrence: There was no danger to the health and aafety of the public cr to station personnel. Instrumentation readout was still available at the Meteoro-logical Tower shelter and from outside (of.f-site) agencies.

C rrective Action: NUS Corporation serviceman effected repairs to the 340 foot wind p direction sensor on September 3, 1980. The Comster computer was repaired and placed p in service at 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br /> on September 5, 1980. _ais work was done under general con- 4' tract with NUS Corporation.

F711ure Data:- A previous failure due to lightning was reported in LER NP-33-77-65.

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LER #80-068 j.

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