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Report No.
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Estimation of cost per severe accident for improvement of accident protection and consequence mitigation strategies

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

The "cost per severe accident" was introduced as an index to analyze improvement of accident protection and consequence mitigation strategies. This index consists of various costs and consequences converted into monetary values. The evaluations of these costs and consequences were made based on the systematic consequence analysis using level 2 and 3 PSA. The accident sequences were taken from the results of level 2 seismic PSA. The doses to the public and the number of people affected were calculated using the level 3 PSA code OSCAAR. The data obtained from the open documents on the Fukushima Accident are used as much as possible. Sensitivity analyses are carried out to identify the sensitive assumptions or parameters to the cost per severe accident. Base on the results of the sensitivity analyses, optimized accident protection and consequence mitigation strategies are recommended taking into account the various aspects comprehensively using the cost per severe accident.

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