Analysis of Influence of Decay-Cooling Time on on-Line Burnup Measurement of HTR-PM
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摘要: 球床模块式高温气冷堆(HTR-PM)需要对球形燃料元件进行在线燃耗测量,以决定其是否退出燃料循坏。在燃料元件卸出堆芯到达测量位之前,要经过一段时间的冷却与衰变;这段时间对于燃耗测量过程有较大影响。利用同位素燃耗与衰变分析软件KORIGEN和粒子输运模拟计算软件MCNP相结合的方式,分析了燃料元件冷却衰变时间对燃耗测量过程的影响。结果表明,只要采取适当的γ谱分析方法,冷却衰变时间大于50h,就可以满足HTR-PM对燃耗测量系统的要求。Abstract: High Temperature gas-cooled Reactor-Pebble bed Modular（HTR-PM） requires a online burnup assay system to check whether a fuel pebbe should be discharged from fuel circulation according to its burnup value.Each pebble that has flowed out of the core is going to undergo decay and cooling before the burnup measurement, so the interval of decay-cooling time influences the burnup measurement. The paper analyzes this effect using the isotopic depletion and decay analysis code of KORIGEN and particle transport code of MCNP. The result shows that the decay-cooling time of 50 hours can meet the HTR-PM requirement well with the choice of suitable γ spectrum analysis method.
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Key words:
- Decay-cooling time /
- Burnup measurement /
- MCNP /
- Fuel cycle /
- High temperature gas-cooled reactor /
- γ spectrum analysis
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