GEOFILTRATION STUDIES OF CLAY AT THE FUTURE RADIOACTIVE WASTE REPOSITORY FOR IGNALINA NUCLEAR POWER PLANT

Petras Klizas

doi:10.3846/16486897.2014.903186

Abstract

Clay geofiltration studies became important in Lithuania when the clays began to be used as geofiltration barriers for waste disposal sites/repositories. The clay is planned to be used also in construction of the future radioactive waste repository for the Ignalina Nuclear Power Plant. The results of investigation on Stabatiškė subformation till clay occurring at the base of the repository are given in the paper. The investigation has been performed with the purpose to determine potential dependence of clay filtration coefficient values on the number of freeze-thaw cycles and duration of filtration. The filtration coefficient for the repository till clay has been found to be greatly varying at the start of the filtration and during the experiment that lasted several days. This confirms that, during the filtration, structural changeover of clay-forming aggregates takes place with pore space volumes changing and affecting the filtration coefficient values. The filtration parameters are even more affected by freeze-thaw cycles and their number. When the clay thaw is finished the colmatation of fissure system is very slow and incomplete.

Highlights

IntroductionThe investigation has been performe4d, 5w, 6iIthnstthiteupteuropfosFeotooddSetaefremtyi,neApnoimtenatliaHl edaelptehndaenndceEonfvicrloaynmfiletnratti(oBnIcOoeRff)ic,ie3nLt veajulupeessosntrt.h, e number of freeze-thaw cycles and duration of filtLraVti-o1n0.7T6heRfiigltar,atLioantvcioaefficient for the repository till clay has been found to be greatly varying atStuhbe mstaitrtteodf 6thMe fialtrr.a2ti0o1n2a;nadccdeupritnegd t1h4e eAxupger.im20e1n2t that lasted several days
The EU laws contain strict geofiltration characteristics are changing in time due to the above menrIenqturoirdeumcetinotns to be applied for the clay used for such bar- t2io0n11ed). faBcatoctres.ria may degrade TNT under aerobic or rTiehres.nTithreoahryodmroaitsiocleaxtipolnosciavpe,a2b,i4li,t6y-torfinciltaryotlaoylueresnde e(TpeNnTds), ohnasmbaneeyninetxertreenlsaitveedlyfauctsoerds afonrd opvarearm1e0t0ersy:epaerrs,maenadbiltithyi,s ppoerrossisitye,nmt ticorxoicstrourcgtaunreicpceocmulpiaoruitnieds ohfasporreesuslptaecde,inmsooi-il sctounret,atmhicnkantieosns oafnndatuernavliroornamrteifnictiaall hpyrdorboleismolsataiotn,mcalanyy mfoirnmerearl ceoxmplpoosisviteisona,ncdhemamicmalucnoimtiopnospitliaontos,f faustuwreellleaa-s cmhailtiet,arhyydarroedaysn(aSmteinculoita,dA, pgaotthenotsia2l0im10p).acTtNofTfrheeazsebeetecn
The following physical properties have been determined as well: natural moisture content – 12%; natural density – 2.25 Mg/m3; hydraulic conductivity obtained by oedometric measurements at 0.1 and 0.2 MPa load is, respectively, 2.3E-11 m/s and 7.1E-11 m/s

Summary

Introduction

The investigation has been performe4d, 5w, 6iIthnstthiteupteuropfosFeotooddSetaefremtyi,neApnoimtenatliaHl edaelptehndaenndceEonfvicrloaynmfiletnratti(oBnIcOoeRff)ic,ie3nLt veajulupeessosntrt.h, e number of freeze-thaw cycles and duration of filtLraVti-o1n0.7T6heRfiigltar,atLioantvcioaefficient for the repository till clay has been found to be greatly varying atStuhbe mstaitrtteodf 6thMe fialtrr.a2ti0o1n2a;nadccdeupritnegd t1h4e eAxupger.im20e1n2t that lasted several days. This confirms that, during the filtration, structural changeover of clay-forming aggregates takes place with pore space. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Geofiltration studies of clay at the future radioactive waste repository for Ignalina nuclear power plant

Objectives

Methods

Results

Conclusion