ML19325E522

Special Rept:On 891014,detection & Suppression Sys for Hot Lab Area Inoperable for Greater than 14-day Period Due to Local Detection Panel Not Resetting Properly.Root Cause Under Investigation & Expected for Completion by 891201

ML19325E522
Person / Time
Site:	LaSalle
Issue date:	10/27/1989
From:	Diederich G COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8911070341
Download: ML19325E522 (1)

Text

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' G CO L' Commonwealth Edison ,

l: Sill) County Nucitar Station i k '"

• Rural Route #1, Box 220

1. Marseilles, Illinois 61341 PRIORITY ROUI'M Telephone 815/357 6761 Mr s t su =d i he ma s -

October 27, 1989 M y]g -

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os gess 1

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! bRM A  ;

Mr. E. Dctis- ggggy  ;

j Regiva-MI P hinistrator  ;

l U.s. Nuclear Regulatory Commission j 199 Roosevelt Road '

ls Glen Ellyn, Illinois 60131

Dear sir:

? . .

t

! This special report is submitted in accordance with.LaSalle Unit 1 operating i License, NpF-11, Appendix A. Technical specification 3.7.5.2 and 6.6.C.

[ on October' 1'4, 1989, at'1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />, the ionization detectors a well as the

• f' proaction sprinkler system _for the Hot Lab area were taken out of service. j k This action was taken following the unsatisfactory performance of Lasalle l

Electrical Surveillance LES-Fp-06, " Channel Functional Test of Dry pipe

[

sprinkler. system Ionization Detectors." During the performance of this 7 j' surveillance, it was observed that the local detection panel would not reset i properly. ,

b The detection and suppression systems for the Hot Lab area have been .

l inoperable for greater than fourteen (14) days and therefore have exceeded the  !

+

14-day period allowed by Technical specifications 3.3.7.9 and 3.7.5.2 prior to  :

.. . requiring a special report ~

p - -

!- To' assure that the level of fire protection does not decrease during the [

l- course of.this event, Lasalle has met the requirements of Action Statement "a"

k of Technical Specification 3.7.5.2 by establishing a continuous fire watch and i, ,

providing backup suppression equipment for the affected zone. Station 3 i troubleshooting measures and vendor recommendations have been unsuccessful in identifying:the root cause. Additional assistance from the vendor is being -

l

.obtained'to identify the root cause. The root cause of this inoperability and repair:is expected to be completed by December 1,- 1989. A supplement-to this 4 letter will be provided when the cause has been determined.

l-l' M L

L,

'W4o p G. J. Diederich ll h/StationManager ,

l, LaSalle County Station 1 1

.GJD/GB/kg

. xc: Nuclear Licensing Administrator NRC Resident Inspector

, NRC Document Control Desk IMPO - Records Center c

S.h f 0911070341 891027 PDR ADOCK 05000373 S PDC , gj % 0 %

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