Lecture5 - Risk Assessment and Management Lecture 5:...

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1 Risk Assessment and Management Lecture 5: Analytical Tools Used in Risk Assessment- Event/Fault Trees Reading Material of the Week s Fleddermann, Engineering Ethics (From Reading Materials) s Stix, Bhopal: A Tragedy in Waiting (From Reading Materials) s Rasmussen, The Application of Risk Assessment Techniques to Energy Industry (Will Be Distributed in Class)
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2 Three Mile Island 4am Accident Started s A valve stuck open s 4 operators on duty – Completed American high school education, but had not graduated. Trained as technicians when in Navy. Passed operator tests. s In the Navy a commissioned officer and graduate engineer would be in charge of operations. In commercial reactors supervision was handled by senior reactor operator promoted from among other operators having passed an examination. s Operators not trained to deal with operations outside Normal Range . s Controls and instruments for equipment located far apart. s Inconsistent location of lights and movement of levers to effect manual operation. Three Mile Island S Many critical functions lacked monitors. S Many displays outside of visual view of operators. S Critical alarms not color coded or given priority. S Nomenclature in manuals did not match labels on control panel. S Emergency procedures indicated what should be watched, but reasonable ranges not provided. No instructions of when and what should be done and how the correctness of decisions should be evaluated. S Could not diagnose the problem, hence failed to keep the reactor core cool allowing its destruction.
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3 Three Mile Island 6am Plant engineer called at home 7am Conditions met to call authorities outside plant s Nuclear Regulatory Commission (NRC) s Pennsylvania Emergency Management Agency (PEMA) s External Plant Managers Met-Ed 7:20am Bureau contacted TMI and told there should be no off- site consequences of accident 7:35am TMI operators notified PEMA that conditions worsening and a general emergency should be
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This note was uploaded on 01/07/2011 for the course ECONOMICS 101 taught by Professor Fernando during the Spring '10 term at Middle East Technical University.

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Lecture5 - Risk Assessment and Management Lecture 5:...

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