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一、引言元件内压是元件设计的重要因素,它是由元件内所充的氦气、吸附气体和释放的裂变气体所造成的。由于裂变原子大约有1/8是不易溶于UO_2的氪和氙,它们的聚集和释放直接影响着芯块的肿胀,气隙热导和元件内压。由于元件在堆内运行时裂变气体释放有其独特的行为,需要直接测量运行元件的内压,以探索裂变气体在堆内的释放特性。元件内压(P)是由自由气体量(n个克分子)、相连的开口孔(包括裂缝)及空腔体积和芯块温度所决定:
I. INTRODUCTION Component internal pressure is an important factor in component design. It is caused by helium gas, adsorbed gas and released fission gas in the component. Since about one-eighth of fissioned atoms are krypton and xenon which are not easily soluble in UO 2, their aggregation and release directly affect the swelling of the pellets, the thermal conductivity of the air gap and the internal pressure of the components. Due to the unique behavior of fissile gas released during the operation of the reactor, it is necessary to directly measure the internal pressure of the operating element to explore the release characteristics of the fission gas within the reactor. The element internal pressure (P) is determined by the amount of free gas (n moles), the associated open pores (including cracks) and the cavity volume and pellet temperature: