ML20085C943

AO 50-254/74-30:on 740927,sample Indicated Radwaste Tank Farm Had High Ci Inventory.Caused by Out of Svc Waste Collector Filter.New Addition to Radwaste Facility Under Const

ML20085C943
Person / Time
Site:	Quad Cities
Issue date:	10/07/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085C947	List: ML20085C943 ML20085C951
References
AO-50-254-74-30, NJK-74-318, NUDOCS 8307130256
Download: ML20085C943 (3)

Text

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I Comm stth Edison Quad-Cigte.. -sencrat.ng Station b

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Mr. John P. O' Leary, Director Q w' d l Directorate of Licensing Regulation U. S. Atomic Energy Cormission Washincton, D. C. 20545 HEIEREIK;E: Quad-Cities Muelcar Power Station i Docket No. 50-254, DPR-29 Appendix A, Sections .1.0. A.2, 3 8.E, 6.6.B.1.a

Dear Mr. O ' Lear /' :

EnclosedpleasefindAbnormaldecurrenceReportNo.A.O. 50-254/74-30 for Quad-Cities Huclear Power Station. This occurrence uas previously reported to Region III, Directorate of Regulatory Operations by telephone on September 27, 1974 and to you and Recion III, Direc'., orate of Regulatory Operations by telecopy also on September 27, 1974

, This report is submitted to you in accordance with the requirements of i

Technical Specification 6.6.B.1.a.

Very Truly Yours, CO GO!MEALTH EDIS0!! COMPANY QUAD-CITIES UUCLEAR F0WER STATION

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,Y% %E N. J. Kalivianakis Station Superintendent NJK/hEQ/rhb cc: Region III, Directorate of Regulatory Operations J. S. Abel 10GD a- a s4 8307130256 741007 gDRADOCK 05000254 , , , _ _

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O O REPORT nemR: Ao 50-254/74-30  ;

REPORT DATE: October 7, 1974 ,

OCCURREMCE DATE: September 27, 1974 PACILITY: Quad-Cities Nuclear Power Station Cordova, Illinois 61242 IDR!?PIPICATIO" OP CCCURIG?!CE: Radwaste tank farm high curie inventory.

C0i!DITIO?!3 P'tTOIt TO OCCURRTICE:

t Both Units in Run :* ode; Unit 1, steady state at 779 :Ge; Unit 2 at 200 Icio and increasing, Radwaste waste collector filter was out of service for maintenance.

DESCRIPTICM GP CCCU'!RiliCE:

On September 26, 1974, the radwaste waste collector filter was out of service for maintenance. Nor al flow of water from the waste collector was thus interrupted and the water was being sent to the waste surce tank. A sample taken at 8:00 Ki on September 26, indicated the total tank farm curie inventory was 3.66 curies; 2.66 curies was in the was t,e surge tank. The waste filter was returned to cervice at 7:00151 on September 26, at which time the operating department again becan processing the waste collector in the normal manner throuch the waste filter and waste demineralizer to storage. Recycling of the waste surce tank was also becun following return to service of the waste collector filter. At 8:00 AI on September 27, 1974, the tank farm curie inventory still exceeded 2 curies, thus violating Technical Specification 3.8.E. f DESIGNATIOU GP APPARF"7P CAUSE OF OCCURR:2:CE:

f Unusual Service condition:

The apparent cause of this occurrence is designated as due to an unusual service condition. The unusual condition was that the waste collector filter was out of service. Since the waste water continued to flow to the radwaste facility it was necessary to route the waste collector to the surge tank to accomodate the water inventory. Following return to service of the filter, the water was not able to be processed to be within the limits within the time element allowed.

/(NALYSIS OP OCCIEE"CE:

There were no abnormal health or safety implications associated with this occurrence. There were no excessive personnel exposures related to this since -

the tank farm a.ea radiation dose rates remained within their normal rance.

There were no c,ff-site exposure problems since all of the waster was processed back to the radwaste fvcility.

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e CORUCTIVt? ACTT0!!:

The inmediate corrective action taken was to recycle the waste surge tank water as soon as was possible. The recyclinrr continued until the waste surge tank was completely processed. At 1:30 IN on September 28, 1974, the tank farm curie inventory was 1 73 curies which was within the Technical Specifi-cations limit.

At the present tino, a new addition to the radwaste facility is under construction. The added capacity and flexibility to be provided by this additior. Rould climinate occurrences of this type in the future.

FATI,URi? D.iTA:

There is no failure data directly re;)ortable for this occurrence since there were no equip-ent failures directly involved. Ilowever, the following information is provided since the filter being cut of service was the cause for the unucual service condition. The waste collector filter uac cut of service for replacement of the filter elements as a step to resolve a problem of short runs for the waste demineralizer resins. The filter element replaced was found to be defective and to date since the element replacement, the waste domineraliser performance has been adequate. The filter element involved is an described below:

CROLL-RLYI:0LDS 7::GI!!iERI::G COMPA!IY, II;C.

Filter consisting of (41) 2-3/4" 0.D. by 4'-B" effective length Type 304 stainless steel "'. edge ' dire" filter element assenblies suspended from a Type 304 stainless steel tube sheet.

Cumulative experience has shown that there had been previous problems with these filters. Operating practice chances recomended by the vendor have teen implemented recently. It is fel' th _ c these changes should improve the future s, performance of these filters.

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