Tokai-Mura Criticality Accident: Neutron Dose Assessment

Tokai-Mura Criticality Accident: Dose Assessment by Daniel L. Maierhafer For EE&S812 Environmental Engineering & Science, L.G. Rich Environmental Research Laboratory Clemson University, Clemson, SC 29634

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Japan’s Energy Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tokai-mura Company Details ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tokai-Mura Nuclear Fuel Conversion Site ,[object Object]

Accident Overview ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tokai-Mura Chemical Process ,[object Object],[object Object],[object Object],[object Object]

Causes of Criticality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What Happened ,[object Object],[object Object],[object Object]

Emergency Actions Taken to Stop Criticality ,[object Object],[object Object]

Uranium Precipitation Vessel ,[object Object],[object Object],[object Object],[object Object]

Tokai-Mura Criticality Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Human Health Effects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tokai-Mura Public Safety Measures ,[object Object],[object Object],[object Object],[object Object]

Fission Products Released to Environment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Schematic View of Uranium Containment Building Uranium Containment Building Precipitation Vessel Uranium Transfer Building Top View Front View

Fissions/second at beginning of criticality

Fissions/second estimate used for Dose Calculation Valve Shut off Worker flees

Steps to Calculate Dose (I) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Calculate Dose (II) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Calculate Dose (III) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Calculate Dose (IV) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Calculate Dose (V) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Improvements to Dose Calculation ,[object Object],[object Object],[object Object],[object Object]

International Nuclear Event Scale ,[object Object],[object Object],[object Object],[object Object],[object Object],Accident Incident Deviation No Safety Problem 7 6 5 4 3 2 1 0

Equivalent Dose Limit Guidelines 1 mSv/year Annual General Public 50 mSv/year Annual for Workers 100 mSv Emergency Situations Whole Body Dose Personnel

Exposure Summary from Literature (17 Sv) (6-10 Sv)

Legal implications ,[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object]

Tokai-Mura Criticality Accident: Neutron Dose Assessment

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Editor's Notes