Study on Effectiveness of Hydrogen Control System for CANDU6 Heavy Water Reactor
During severe accident of the CANDU6 nuclear power plant,the zirconium oxidation of the fuel cladding,pressure tubes,and calandria tubes will produce a large amount of hydrogen.When the hydrogen concentration reaches a certain value,hydrogen combustion,deflagration or explosion may occur inside the containment,producing a large pressure load and posing a threat to the integrity of contain-ment.This paper use the MAAP-CANDU(version 5.00A)to establish an integrated severe accident analysis model for the CANDU6 heavy water reactor,including the core,primary and secondary systems,containment,severe accident prevention and mitigation systems,et al.The effectiveness of hydrogen control system in the CANDU6 containment are studied with typical severe accident scenario such as station blackout(SBO),outlet header large LOCA(LLOCA).The analysis results show that,with passive hydrogen recombiners(PAR)in effective,PAR can effectively eliminate hydrogen,and the hydrogen concentration in each room of containment does not ex-ceed 4%.The possibility of detonation or explosion in the containment compartment is extremely low.The number and arrangement of PAR in CANDU6 heavy water reactor are reasonable.
CANDU6 heavy water reactorHydrogen riskPARSevere accident
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