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 ...
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<strong>LLW</strong> Repository LtdNati<strong>on</strong>al Waste ProgrammeNWP/REP/011Issue 2.1 – Jan 2013Page 49 <strong>of</strong> 58<strong>LLW</strong><strong>ILW</strong>/<strong>LLW</strong>Case Study G – DFD dec<strong>on</strong>taminati<strong>on</strong> <strong>of</strong> Wylfa heat exchanger platesChallengeWylfa Nuclear Power Stati<strong>on</strong> (Magnox Ltd.) identified a c<strong>on</strong>taminati<strong>on</strong> issue with heat exchanger plates,which require periodic refurbishment by an <strong>of</strong>f-site c<strong>on</strong>tractor. These heat exchanger plates are used in <strong>the</strong>cooling loop <strong>on</strong> <strong>the</strong> pressure vessel to remove heat from <strong>the</strong> cooling water before it is discharged to sea.These plates are subject to mildly radioactive deposits from <strong>the</strong> precipitati<strong>on</strong> <strong>of</strong> ir<strong>on</strong> corroded from <strong>the</strong> carb<strong>on</strong>steel pipe work in <strong>the</strong> system. Removal <strong>of</strong> <strong>the</strong>se deposits was deemed necessary to enable <strong>the</strong> transfer <strong>of</strong><strong>the</strong> waste to an <strong>of</strong>f-site c<strong>on</strong>tractor for refurbishment.Soluti<strong>on</strong>Bradtec worked with Wylfa to deploy <strong>the</strong> mobile DFD process rig at an appropriately licensed <strong>of</strong>f-sitelocati<strong>on</strong>. The plates were subject to <strong>the</strong> DFD process which successfully removed <strong>the</strong> mildly radioactive ir<strong>on</strong>deposits from <strong>the</strong> complex heat exchanger plate geometries, generating a small volume <strong>of</strong> c<strong>on</strong>taminated i<strong>on</strong>exchange resin disposed <strong>of</strong> by Wylfa. This project facilitated <strong>the</strong> unrestricted release <strong>of</strong> 1500 heat exchangerplates for refurbishment <strong>and</strong> re-use <strong>on</strong> site at Wylfa.Figure 13 – Wylfa Heat Exchanger plateprior to applicati<strong>on</strong> <strong>of</strong> DFD processFigure 14 – Wylfa Heat Exchangerplate post applicati<strong>on</strong> <strong>of</strong> DFDprocessA company owned by UK Nuclear Waste <strong>Management</strong> LtdNOT PROTECTIVELY MARKED
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