ML19325E356

Special Rept 89-008-0:on 891010,instrument Channel Inoperable for More than 72 H.Caused by Turbine Bldg Exhaust Accident Range Monitor Declared Inoperable After Sample Flow Calculations Could Not Be Completed Due to Leaking Valve

ML19325E356
Person / Time
Site:	Grand Gulf
Issue date:	10/24/1989
From:	Cottle W SYSTEM ENERGY RESOURCES, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
89-008-0, 89-8, AECM-89-0194, AECM-89-194, NUDOCS 8911060326
Download: ML19325E356 (2)

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U.S. Nuclear Regulatory Commission i L Mail Station F1-137 -

Washington, D.C. 20555 j l

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Attentinn: Document Control Desk October 24, 1989  !

l Gentlemen:

SUBJECT:

Grand Gulf Nuclear Station l l Unit 1 i Docket No. 50-416 l License No. NPF-29 '

Special Report 89-008-0  !

Inoperability of Accident >

Honitor Exceeds 72 Hours  :

AECH-89/0194  :

i The Turbine Building ventilation exhaust accident range radiation monitor was removed froin service on October 10, 1989 to perform a surveillance as required  ;

by Technical Specification Table 4.3.7.5-1. The monitor was declared inoperable l after sample flow calculations could not be completed for Channel 4 of the ,

monitor. l An investigation into the problem revealed the purge inlet valve and a grab sample valve were leaking by. Inleakage from these normally closed valves, i caused the calculated flow to fall outside of specified ranges. Due to procurement problems, valve replacement was delayed. The purge inlet valve ,

was replaced and the grab sample valve was capped. The monitor retested '

satisfactory and was restored to service on October 20, 1989. ,

This Special Report is being submitted pursuant to Action 61 of Technical Specification Table 3.3.7.5-1 since the instrument channel inoperability exceeded 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The preplanned alternate method of monitoring as required by Action 81 was to utilize procedure 06-CH-ID17-V-0058 if the General Electric (GE) Noble Gas Effluent Monitor exceeded a specified count rate. The GE -

Noble Gas Effluent Monitor was operable during this time period and did not exceed the specified count rate.  :

10gg [ 6 Yours truly, S -

WC cwg Attachment ~"0'~7 t- @wm cc (See next page) crwo cm sme r.wm } ,

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• • • 'C"" i PCOM SPECIAL REPORT 89-008-O '"T* I

h' AECM-89/0194 ,

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I cct Mr. D. C. Hints (w/a) ,

l Mr. T. H. Cloninger (w/a)  :

Mr. R. B. McGehee (w/a) t-Mr. N. S. Reynolds (w/a) e Mr. H. L. Thomas (w/o)

[ Mr. H. O. Chrittensen (w/a)  !

Mr. Stewait D. Ebneter (w/a) i Regional Administrator U.S. Nuclear Regulatory Commission ,

l' Region II j 101 harietta St., N.W., Suite 2900 .

Atlanta -Georgia 30323  ?

l p Mr. L. L. Kintner. . Project Manager (w/a) I Office of' Nuclear Reactor Regulation  !

U.S. Nuclear Regulatory Commission Mail Stop'14B20 l, 3

. Washington, D.C. 20555 }

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