Uncertainty analysis and its application of radioactive source term of HPR1000 under severe accident

Abstract

The calculation model of HPR1000 has been built with MAAP code. The key parameters of fission products release, transfer and deposition have been screened out, and 500 input cases have been generated by Latin-Hypercube sample. The probability distributions of release fraction under the condition of intact containment for each fission product groups have been calculated. The result from uncertainty analysis has been used to calculate the off-site dose rate based on Zhangzhou NPP meteorology conditions with different percentile FP release. It has been demonstrated that no sheltering is needed beyond 3 km from the reactor even with conservative consequences.

Keywords

• HPR1000
• Radioactive source term
• Uncertainty analysis
• Radiological consequences
• Severe accident