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Presented by: Jonathan Silvester Oliver Kiernan. Maxey Flat Site Located in Fleming County, Kentucky Low level Nuclear Disposal Facility o Isolate waste.

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Presentation on theme: "Presented by: Jonathan Silvester Oliver Kiernan. Maxey Flat Site Located in Fleming County, Kentucky Low level Nuclear Disposal Facility o Isolate waste."— Presentation transcript:

1 Presented by: Jonathan Silvester Oliver Kiernan

2 Maxey Flat Site Located in Fleming County, Kentucky Low level Nuclear Disposal Facility o Isolate waste from people and the environment until radionuclides have decayed to non hazardous levels 1 of 6 waste disposal sites created in the US Approximately 663 people live within 2.5 miles Located on one of the largest flat top ridges in the area

3 History of Maxey Flat Site Nuclear Engineering Company bought site Application to bury nuclear waste granted 1974 – Plutonium detected outside site boundary 1977 – Site Closed 1986 – Site placed on National Priorities List 1995 – Clean up of site begins

4 Waste Disposal Served 832 corporations A 279 acre waste burial site Consisted of 52 trenches “Hot Wells’ for special nuclear material 4,750,000 cubic feet of waste stored

5 Reasons for Failure Poor planning and design o Site soil wrong composition o Highly permeable soil used for Protective Cap Poor site organisation and management o Spills cleaned with standard earth moving equipment o Poorly placed waste o Waste not in suitable containers Poor government legislation o Guidelines of high and low level radioactive waste

6 Reasons for failure – Bathtub Effect Build up of water in trenches caused by greater seepage into trench Capped with 3-10 feet of soil Not concrete or steel Collapsed due to rain water Water became radioactive Nuclear waste overflowed out of the trenches

7 Impacts Radiation detected extremely small o 1 in 40 million chance of getting cancer No major health or environmental implications However, great concerns with; o Rainwater runoff o Groundwater flow o Air Born Pollutants Immediate closure of site Multi million pound clean up operation

8 Contaminants Contaminated all areas of the site “Indicator contaminants” were of concern o Radionuclides;  Tritium  Cobalt-60  Strontium-90  Plutonium-238/239 Tritium was of the greatest concern o Most abundant o Most mobile o Easily able to form tritiated water o Non Radionuclides;  Arsenic  Benzene  Lead  Cyanide

9 Clean up Process Main objectives; o Minimize infiltration/ mitigation of rainwater and ground o Stabilize site for long term cap o Reduce risks to human health and environment 7 alternative remedial solutions o Dynamic Compaction o Vertical infiltration prevention methods o Horizontal infiltration prevention methods All subjected against 9 criteria's Chosen solution – Natural Stabilization o Allow materials to stabilise o Permanent cap o Reviews every 5 years

10 Natural stabilization Consists of 4 stages; 1) Initial Closure period – Completed May 2003 Remove, solidify & store leachate Demolish buildings & grade site Initial cap placed Install Monitoring equipment 2) Interim maintenance – Current stage (35 – 100years) Monitor natural stabilisation Provide buffer zone 3) Final closure period Installation of Final cap 4) Custodial maintenance Begins once final cap completed


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