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Abstract A program named MOPOL based on lumped parameter model was developed to assess IVR (invessel core debris retention) effectiveness according to the IVR assessment method——ROAAM (risk oriented accident analysis methodology), then the program was validated. Regarding the key parameters in IVR assessment such as break size, average effective time of irradiation and structure mass in the vessel, uncertainty analysis was made to evaluate the effects of these parameters to IVR effectiveness. The analysis results indicate that in the case of larger break accident and longer irradiation time, safety margins of the pressure vessel wall to thermal failure are smaller; in addition, properly increase structures mass in the pressure vessel can enhance IVR effectiveness.
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Received: 15 September 2011
Published: 28 September 2012
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