Abstract
A numerical simulation program for the dynamic distribution of krypton and xenon with flow and on-line removal function was established for primary loop system of molten salt reactor(MSR) Based on Mathe-matica7.0.The simulation results of the static burnup was compared with ORIGEN-S program, and the deviation is less than 10%, which is in good agreement.The distribution and dynamic characteristics of krypton and xenon in the primary loop system were analyzed under the flow regionalization and online removal model.The results show that,the static burnup model underestimates the total 135Xe activity about 6.61% in the system, and the total activity of krypton and xenon in the system is underestimated by about 1.46%.Under the maximum removal fraction, the total activity of krypton and xenon in the exhaust gas system is 1.84×1016Bq, of which 83mKr, 85mKr, 87Kr, 88Kr, 133Xe, 135Xe and 138Xe account for about 95.6%.The total activity of krypton and xenon in the primary loop system is 2.64×1014Bq, of which 138Xe, 135mXe, 134mXe, 87Kr and 83mKr account for about 93.6%.The numerical simulation method and the conclusion consistent with the actual physical laws.Dynamic distribution, evolution and migration characteristics of krypton, xenon and these precursor in the primary loop in the molten salt can be simulated more accurately compared to static burnup model.The analysis results can provide a theoretical basis for the management scheme of airborne source termsthe cooling design of the radioactive exhaust system and the source term analysis in accident conditions for the molten salt reactor.
Highlights
The concept of Molten Salt Reactor (MSR) originated from the Aircraft Reactor Experiment (ARE)[1, 2] Molten Salt Reactor Experiment (MSRE)[3, 4], Molten Salt Breeding Reactor (MSBR) constructed or designed by Oak Ridge National Laboratory (ORNL) in the 1950s and 1970s[5, 6], Denatured Molten Salt Reactor (DMSR)[7] and other experimental reactors.In 2011, the Thoriumbased Molten Salt Reactor Nuclear Energy System (TMSR) project was set up by Chinese Academy of Sciences
In the 2MW MSR, krypton and xenon will be blown into the off-gas system by the bubbling system at the pumping bowl
In order to ensure that the emissions of krypton and xenon meet the regulatory requirements, krypton and xenon need to be fully decayed in the off-gas system.The decay time and cooling system design are related to the total activity of the krypton and xenon blown into the off-gas system.The core fission product analysis program used in the engineering design of 2MW MSR is ORIGEN-S
Summary
The concept of Molten Salt Reactor (MSR) originated from the Aircraft Reactor Experiment (ARE)[1, 2] Molten Salt Reactor Experiment (MSRE)[3, 4], Molten Salt Breeding Reactor (MSBR) constructed or designed by Oak Ridge National Laboratory (ORNL) in the 1950s and 1970s[5, 6], Denatured Molten Salt Reactor (DMSR)[7] and other experimental reactors.In 2011, the Thoriumbased Molten Salt Reactor Nuclear Energy System (TMSR) project was set up by Chinese Academy of Sciences. A molten salt reactor with 2 MW thermal power(Hereinafter referred to as 2MW MSR) is planned to be built in 2020[8]. Krypton and xenon are strictly controlled emission sources of nuclear power plants. In order to ensure that the emissions of krypton and xenon meet the regulatory requirements, krypton and xenon need to be fully decayed in the off-gas system.The decay time and cooling system design are related to the total activity of the krypton and xenon blown into the off-gas system.The core fission product analysis program used in the engineering design of 2MW MSR is ORIGEN-S. The flow characteristics and spatial distribution of the krypton and xenon in primary loop of molten salt reactor can not be analyzed by such a
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