Strategic Guidance on the Management of LLW and ILW / LLW ...
Strategic Guidance on the Management of LLW and ILW / LLW ...
Strategic Guidance on the Management of LLW and ILW / LLW ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>LLW</strong> Repository LtdNati<strong>on</strong>al Waste ProgrammeNWP/REP/011Issue 2.1 – Jan 2013Page 46 <strong>of</strong> 58Technique Descripti<strong>on</strong> Limitati<strong>on</strong>s <strong>and</strong> c<strong>on</strong>straints Trials <strong>of</strong> process Outcome <strong>of</strong> trialsGarnetBlasting [Ref.14, 15]Garnet blasting is a mechanical surfacedec<strong>on</strong>taminati<strong>on</strong> technique which uses garnet (amixture <strong>of</strong> various silicate chemicals) as an abrasivewhich is propelled in a high-energy jet stream at atarget area, which abrades away <strong>the</strong> c<strong>on</strong>taminati<strong>on</strong>.This is <strong>of</strong>ten used in c<strong>on</strong>juncti<strong>on</strong> with UHP water jetting.• The technique is most effective<strong>on</strong> flat surfaces – items withmore complex geometries maysee a reducti<strong>on</strong> in efficacy.• Only applicable to surfacec<strong>on</strong>taminated wastes (unlessas precursor step to o<strong>the</strong>rwaste treatment methods).• Process generates a largevolume <strong>of</strong> sec<strong>on</strong>dary waste,owing to <strong>the</strong> volume <strong>of</strong> abrasivemedia <strong>and</strong> water used.• Trialled at Bradwell(Magnox Ltd.) totest effectiveness<strong>of</strong> process <strong>on</strong> p<strong>on</strong>dfurniture <strong>and</strong> o<strong>the</strong>rc<strong>on</strong>taminatedmetals.Garnet blastingobserved to beeffective in <strong>the</strong>surfacedec<strong>on</strong>taminati<strong>on</strong> <strong>of</strong>metal but has notbeen progressed t<strong>of</strong>ur<strong>the</strong>r trials orroutine usage owingto <strong>the</strong> large volume<strong>of</strong> sec<strong>on</strong>dary waste<strong>and</strong> <strong>the</strong> limitedlifespan <strong>of</strong> <strong>the</strong>media.• Garnet has a limited lifesp<strong>and</strong>ue to disintegrati<strong>on</strong> <strong>of</strong> <strong>the</strong>media.A company owned by UK Nuclear Waste <strong>Management</strong> LtdNOT PROTECTIVELY MARKED
Change language