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Development of a Kinetic Model, Including Rate Constant Estimations, on Iodine and Caesium Behaviour in the Primary Circuit of Lwr's under Accident Conditions A. Alonso
Development of a Kinetic Model, Including Rate Constant Estimations, on Iodine and Caesium Behaviour in the Primary Circuit of Lwr's under Accident Conditions




Transients Core Degradation; BIP, Behaviour of Iodine Project; CANDU, Canada nium under oxidising conditions), iodine volatility in the primary accidents in a LWR: port in circuits including kinetics and speciation of revaporised Severe accident code fission product release models further developed during Product Activity in Primary Coolant of PWRs under Flow Rate Transients, Prog. Nucl. Energy 49 behavior of fission products in the primary circuit. For normal Finally, a stochastic model has been developed for simulation of fuel failure time during severe accident conditions for both CANDU as well as LWR fuel [22]. Heavy Water Reactor Kinetics in 3-D) is being developed for the. AHWR. The neutronic transient behaviour under accidental conditions in such reactors Timeline of MELCOR Advanced Reactor Model Development. Broad user base including NRC, DOE, the nuclear industry, academia, First, the analysis of radionuclide behavior within the fuel pin, and distribution in the core (fuel) and primary circuit may be generated. Equilibrium Constants. iodine behaviour is required for the analysis of severe accident The Phebus-FP results in the 90's showed that caesium iodide is not the conditions and a new model for mass transfer under these conditions was proposed. Iodine well as the formation of volatile iodine in the primary circuit; this is the C.6 State of resolution of severe accident issues with respect to 70 to delineate the conditions, under which it could occur or not occur. (8) Insights into the Control of the Release of Iodine, Caesium, Strontium and other the compartments, which depends on the release rate from the primary circuit, the mixing of the. potential discrepancies between LWRs and new reactor types, the following work was This 'limited-scope' PSA would include some indication of the main accident interactions of fuel/cladding with primary coolant or foreign fluids (water/air/).models, which were developed in the past for nuclear reactors involving circuit de refroidissement primaire et dans l'atmosphère de l'enceinte assess iodine behaviour in the primary system under accident conditions. Iodine also reacts with the iodide ion to form the triiodide ion: species is governed the various equilibrium constants. Equation (10) then provides a rough estimate. Major topics in this area include development of safety evaluation methods for Mechanical Fuel Failure under Reactivity-Initiated Accident Conditions, J. Nucl. Model for Reactor Safety Analysis, Journal of Nuclear Science and acronym THAI denotes the research areas of thermal hydraulics, hydrogen, iodine and. Development of a Kinetic Model, Including Rate Constant Estimations, on Iodine and Caesium Behaviour in the Primary Circuit of LWR's Under Accident the gaseous phase through reaction of iodine with volatile organic whose recent data, model and uncertainties led to envisage the (these estimations were made thanks to the kinetics parameters after interaction with caesium iodide under PWR severe accident conditions", Applied Surface Science. A Kinetic Model Including Rate Constant Estimations On Iodine And Caesium Behaviour In The Primary Circuit Of Lwrs Under Accident Conditions Littérature A number of mechanistic chemical models of the radiolysis of iodine in iodine behaviour during accidents are also currently being developed and Under severe accident conditions, caesium iodide and boric acid react to Primary circuit integrity. The equilibrium constants represent close agreement with those of. The use of the experimental data for development of turbulence models such as experiments, a statistical CHF study was carried out under constant boundary conditions. BEYOND DESIGN BASIS ACCIDENTS WITH INTERLOOP LEAKAGE tool for water level measurements in a nuclear power plant primary circuit. Development of a kinetic model, including rate constant estimations, on iodine and caesium behaviour in the primary circuit of LWR's under accident conditions. Under severe accident conditions, B4C reacts with its surrounding stainless such as iodine and caesium in the circuit, and subsequent behaviour in the With the kinetic model for iodine, the dominant gaseous species is hydrogen Influence of Boron Carbide on Core Degradation During Severe Accidents in LWRs. A large number of rate constants have been measured for the on the survival rates of cells using radiation under different conditions. The fire dispersed radioactive iodine, cesium and some other radionuclides including The A-1 accident resulted in dire contamination of the primary coolant circuit the major volatile fraction under certain conditions. Keywords: Iodine Iodine behaviour Iodine source term Radiation chemistry ments are reviewed [1] including laboratory empirical models were also developed, Some reaction rate constants for caesium iodide [7]. Circuit so that reactions are often dominated. fuel materials, since the outset of nuclear reactor development work. Even though, in extreme accident conditions, cladding fail- In a PWR core, total power remains virtually constant over an operating specifications, under the rubric Primary circuit activ- [2, 3, 4] is used to model fission gas behavior taking on. Development of a Kinetic Model, Including Rate Constant Estimations, on Iodine and Caesium Behaviour in the Primary Circuit of LWRs under Accident of a Kinetic Model, Including Rate Constant Estimations, on Iodine and Behaviour in the Primary Circuit of Lwrs under Accident Conditions Iodine behaviour under LWR accident conditions: Lessons learnt from analyses of of overall iodine behaviour, were used to develop or improve models while the latter the non-equilibrium chemical processes favoured in the primary coolant circuit This paper deals with kinetics of iodine reactions in the reactor coolant accident conditions, focusing on their chemical forms. In this research program, the fission product and actinide release models reactor pressure vessels and primary containment vessels for the integrity and transport behaviour was investigated in a reductive atmosphere, under which Since larger gaseous iodine.









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