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一、引言压水堆燃料元件设计中,由于芯块与包壳径向间隙大小直接影响燃料芯块的温度,因此间隙一般选为100微米左右(包壳内径与芯块外径差)。燃料元件在运行过程中,
I. INTRODUCTION In the PWR fuel element design, the clearance is generally selected to be about 100 microns (the inner diameter of the cladding is different from the outer diameter of the pellet) because the radial clearance between the pellet and the cladding directly affects the temperature of the fuel pellet. Fuel elements in operation,