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为了通过微氢泄漏探测系统正确判断快堆蒸汽发生器水 /水蒸汽小泄漏 ,建立了快堆蒸汽发生器水 /水蒸汽向钠泄漏后钠水反应产生的氢沿蒸汽发生器扩散的数值模型。假设为大孔隙多孔介质 ,模拟钠在蒸汽发生器内的流动 ,引入体积孔隙率 ,面渗透率和分布阻力来模拟管束、支撑板对钠流动的扰动。根据钠水 /水蒸汽反应生成的氢气和氢氧化钠在钠中离解动力特性 ,建立氢离子和氢氧根离子的扩散方程。钠回路蒸汽发生器的注水模拟水 /水蒸汽泄漏实验表明 :微氢泄漏探测系统对蒸汽发生器钠出口处氢浓度模型计算值的响应与其实测响应吻合的很好
In order to accurately determine the small water / steam leakages in a fast reactor steam generator by using a micro-hydrogen leak detection system, a numerical model for the diffusion of hydrogen generated by the sodium-water reaction from the water / steam to the sodium leak in a fast reactor is established . Assuming macroporous porous media, the flow of sodium in the steam generator is modeled. Volume porosity, surface permeability and distribution resistance are introduced to simulate the perturbation of the tube bundle and support plate on the flow of sodium. According to the kinetic properties of dissociation of hydrogen and sodium hydroxide generated by sodium / water vapor reaction in sodium, a diffusion equation of hydrogen ions and hydroxide ions is established. The simulated water / steam leakage experiments of the sodium return steam generator show that the response of the micro-hydrogen leakage detection system to the calculated hydrogen concentration at the sodium outlet of the steam generator is in good agreement with the measured response