压水反应堆达临界的外推修正

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Extrapolaion Modification of Physical Start-up of Reactors

Nuclear Power Qinshan Joint Venture Company Limited, Haiyan, Zhejiang, 314300, China

摘要: 通过外推临界状态来控制反应性引入是目前压水堆核电厂反应堆达临界的常用手段。在分析线性外推理论不足的基础上,运用有源、次临界状态下的中子倍增理论,对非平衡态、稀释阶段和提控制棒阶段的中子计数进行了分析。分析结果表明,在临界外推过程中,稀释的滞后效应、控制棒微分价值的非线性变化、次临界下中子注量率的非均匀增长等因素严重影响外推临界状态。针对这些影响因素,对线性临界外推方法提出了初步的修正方法和改进建议。
- 压水堆 /
- 达临界 /
- 外推 /
- 修正
Abstract: The result of extrapolation is very important to the physical start-up,and it is used to control the speed and quantity of the reactivity.Using the neutron multiplication formula for active and sub-critical condition,the non-balance situation of neutron counts,the dilution,and the lifting of banks are analyzed.The results show that the delayed effect of dilution,the non-linearity of the integral worth of the control rods,and the non-linear increase of the flux have great effects on the accuracy of the extrapolation.We consider those effects and give some advices on the modification of the extrapolation.
- PWR /
- Physical start-up /
- Extrapolation /
- Modification