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首页> 美国政府科技报告 >Post Test Investigation of the Bundle Test ESBU-1. On Temperature Escalation in PWR Fuel Rod Simulator Bundles Due to the Zircaloy/Steam Reaction
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Post Test Investigation of the Bundle Test ESBU-1. On Temperature Escalation in PWR Fuel Rod Simulator Bundles Due to the Zircaloy/Steam Reaction

机译：捆绑测试EsBU-1的测试后调查。基于锆锡/蒸汽反应的压水堆燃料棒模拟器温度升温问题

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This KfK report describes the post test investigation of bundle experiment ESBU-1. ESBU-1 was the first of two bundle tests on the temperature escalation of Zircaloy clad fuel rods. The investigation of the temperature escalation is part of the program of out-of-pile experiments performed within the frame work of the PNS - Severe Fuel Damage program. The bundle was composed of a 3x3 fuel rod array of our fuel rod simulators (control tungsten heater, UO/sub 2/-ring pellet and Zircaloy cladding). The length was 0.4 meter. After the test the bundle was embedded in epoxy and cut by a diamant saw. The cross sections are investigated by metallographic, SEM and EMP examinations. The results of these examinations are in good agreement with the seperate effects tests investigation of the PNS SFD-Program and inpile experiments of the Power Burst Facility. The investigations show that liquid Zircaloy dissolves UO/sub 2/ by taking away the oxygen from the oxide. Depending on the overall oxygen content the (U,Zr,O)-melt forms at refreezing a) three phases (low oxygen content): metallic alpha -Zry(U), a uranium-rich metallic (U,Zr)alloy, and a (U,Zr)O/sub 2/ mixed oxide, or b) two phases (high oxygen content): alpha -Zr(O) and the (U,Zr)O/sub 2/ mixed oxide. c) In melt regions where the local oxidation was very severe, such as in steam contact, only the (U,Zr)O/sub 2/ mixed oxide is formed already at test temperature. Also ZrO/sub 2/ formed during the initial time of the test is dissolved by the melt. (ERA citation 12:018206)

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