CN109615110B - 快堆堆芯内冷却剂流量分区方法 - Google Patents

快堆堆芯内冷却剂流量分区方法 Download PDF

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CN109615110B
CN109615110B CN201811346163.XA CN201811346163A CN109615110B CN 109615110 B CN109615110 B CN 109615110B CN 201811346163 A CN201811346163 A CN 201811346163A CN 109615110 B CN109615110 B CN 109615110B
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李淞
周志伟
冯预恒
马晓
林超
刘光耀
薛秀丽
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Abstract

本发明属于快中子反应堆技术领域，公开了快堆堆芯内冷却剂流量分区方法。该方法包括以下步骤：(1)做出外燃料区堆芯组件与最小冷却剂流量的关系曲线；(2)分别计算出步骤(1)所述的外燃料区最小冷却剂流量曲线中相邻流量的差值并将差值按从大到小的顺序排列，差值排列后便于选取差值较大的流量；(3)按照步骤(1)、步骤(2)，对中燃料区和内燃料区的冷却剂流量区域进行划分。采用本发明提供的冷却剂流量分区方法对钠流量进行分区，既能满足堆芯冷却要求又能最大程度上避免冷却剂流量浪费。

Description

快堆堆芯内冷却剂流量分区方法
技术领域
本发明属于快中子反应堆技术领域，具体涉及快堆堆芯内冷却剂流量分区方法。
背景技术
大型快堆堆芯组件包括燃料组件、不锈钢组件及其他组件。这些组件的材料、结构及在堆芯中所处的位置不同，在反应堆正常运行时的温度及热功率也有较大差别。为了保证各类组件的温度不超过允许的设计值，同时也为了得到较高的堆芯冷却剂的出口温度，从而获得较大的热效率及较低的成本，就必须对堆芯各类组件的冷却剂流量进行合理分配。目前技术中，多是依赖经验和多次试验对流量进行分区和分配，时间成本及经济成本较高。
从原理上讲，各类组件冷却所需的冷却剂流量应该根据每盒组件功率的不同来进行分配的。在设计时，如果组件被分配到的流量偏大，则将使得反应堆的经济性较差；如果被分配到的流量偏小，则将可能导致组件包壳破损甚至融化，威胁反应堆的安全。所以，对每盒组件分配合适的冷却剂流量是安全性与经济性综合考虑的结果，直接关系到反应堆设计的成败与否。但是如果每一盒组件分配一个单独的流量，则涉及到的组件加工及后续水力试验的工作量巨大，在实际工程中无法实现。如何根据总体的设计要求，对某一种类的组件分配合适的流量和流量区就成为目前亟待解决的一个问题。
发明内容
(一)发明目的
根据现有技术所存在的问题，本发明提供了一种能够满足快堆堆芯冷却要求、操作难度低且经济性高的冷却剂流量分区方法。
(二)技术方案
为了解决现有技术所存在的问题，本发明是通过以下技术方案实现的：
快堆堆芯内冷却剂流量分区方法，该方法包括以下步骤：
(1)做出外燃料区堆芯组件与最小冷却剂流量的关系曲线
根据每个组件的功率计算出该组件所需的最小冷却剂流量；以组件编号为横坐标，最小冷却剂流量为纵坐标做出外燃料区堆芯组件与最小冷却剂流量的最小冷却剂流量曲线；
(2)分别计算出步骤(1)所述的外燃料区最小冷却剂流量曲线中相邻流量的差值并将差值按从大到小的顺序排列，差值排列后便于选取差值较大的流量；
若需要将反应堆流量分为N个流量区，则从上述差值中按照差值从大到小的顺序选取N-1个差值，形成N个区；在这N个差值所在的最小冷却剂流量曲线的间隔中，插入N-1个差值，即得到了N个流量区，该分区方式即为所需要的流量分区方式；
(3)按照步骤(1)、步骤(2)，对中燃料区和内燃料区的冷却剂流量区域进行划分。
优选地，步骤(2)还可以从差值中按照从大到小的顺序选取N+M-1个差值，形成N+M个区；在这些N+M-1差值所在的最小冷却剂流量曲线的间隔中，插入N-1个差值，一共有
Figure BDA0001863805480000021
种组合方式；N+M个区中每个区内每个组件的流量值为该区中最热组件所需的流量，然后计算出
Figure BDA0001863805480000022
种组合方式中何种分区方式下的总流量最小，即得到了N个流量区，该分区方式即为所需要的流量分区方式。
优选地，所述M的值为2<M<2N。
优选地，所述冷却剂为钠。
(三)有益效果
采用本发明提供的冷却剂流量分区方法对钠流量进行分区，既能满足堆芯冷却要求又能最大程度上避免冷却剂流量浪费。
附图说明
图1是实施例1提供的外燃料区最小冷却剂流量曲线。
具体实施方式
下面将结合说明书附图和具体实施方式对本申请作进一步阐述。
快堆堆芯内冷却剂流量分区方法，该方法包括以下步骤：
(1)做出外燃料区堆芯组件与最小冷却剂流量的关系曲线
根据每个组件的功率计算出该组件所需的最小冷却剂流量；以组件编号为横坐标，最小冷却剂流量为纵坐标做出外燃料区堆芯组件与最小冷却剂流量的最小冷却剂流量曲线；
(2)分别计算出步骤(1)所述的外燃料区最小冷却剂流量曲线中相邻流量的差值并将差值按从大到小的顺序排列，差值排列后便于选取差值较大的流量；
若需要将反应堆流量分为N个流量区，则从上述差值中按照差值从大到小的顺序选取N+M-1个差值，形成N+M个区；在这些N+M-1差值所在的最小冷却剂流量曲线的间隔中，插入N-1个差值，一共有
Figure BDA0001863805480000031
种组合方式，N+M个区中每个区内每个组件的流量值为该区中最热组件所需的流量，然后计算出
Figure BDA0001863805480000032
种组合方式中何种分区方式下的总流量最小，即得到了N个流量区；
(3)按照步骤(1)、步骤(2)，对中燃料区和内燃料区的冷却剂流量区域进行划分，进而得到中燃料区和内燃料区内各组件的冷却剂流量。
所述M的值为2<M<2N。所述冷却剂为钠。
为验证本专利提出分区方法对于流量分区处理的有效性，使用某反应堆外燃料区的功率进行流量分区测试，图1为外区最小冷去及流量曲线。分区结果满足反应堆对冷却剂流量的需求。

Claims (4)

1.快堆堆芯内冷却剂流量分区方法，其特征在于，该方法包括以下步骤：
(1)做出外燃料区堆芯组件与最小冷却剂流量的关系曲线
根据每个组件的功率计算出该组件所需的最小冷却剂流量；以组件编号为横坐标，最小冷却剂流量为纵坐标做出外燃料区堆芯组件与最小冷却剂流量的最小冷却剂流量曲线；
(2)分别计算出步骤(1)所述的外燃料区最小冷却剂流量曲线中相邻流量的差值并将差值按从大到小的顺序排列，差值排列后便于选取差值较大的流量；
若需要将反应堆流量分为N个流量区，则从上述差值中按照差值从大到小的顺序选取N-1个差值，形成N个区；在这N个差值所在的最小冷却剂流量曲线的间隔中，插入N-1个差值，即得到了N个流量区，该分区方式即为所需要的流量分区方式；
(3)按照步骤(1)、步骤(2)，对中燃料区和内燃料区的冷却剂流量区域进行划分。
2.根据权利要求1所述的快堆堆芯内冷却剂流量分区方法，其特征在于，步骤(2)还可以从差值中按照从大到小的顺序选取N+M-1个差值，形成N+M个区；在这些N+M-1差值所在的最小冷却剂流量曲线的间隔中，插入N-1个差值，一共有
Figure FDA0003827573880000011
种组合方式；N+M个区中每个区内每个组件的流量值为该区中最热组件所需的流量，然后计算出
Figure FDA0003827573880000012
种组合方式中何种分区方式下的总流量最小，即得到了N个流量区，该分区方式即为所需要的流量分区方式。
3.根据权利要求2所述的快堆堆芯内冷却剂流量分区方法，其特征在于，所述M的值为2<M<2N。
4.根据权利要求1所述的快堆堆芯内冷却剂流量分区方法，其特征在于，所述冷却剂为钠。
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CN106297905A (zh) * 2016-08-24 2017-01-04 中国核电工程有限公司 一种径向多分区布置的mox燃料组件装载方法
CN108461163A (zh) * 2017-02-21 2018-08-28 株式会社东芝 应急堆芯冷却系统和使用该应急堆芯冷却系统的沸水反应堆装置

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EP2270815A2 (en) * 2009-07-02 2011-01-05 Ansaldo Nucleare S.p.A. Nuclear reactor with inherent shutdown and associated control method
CN102194531A (zh) * 2010-03-11 2011-09-21 中国核动力研究设计院 快中子反应堆燃料双行波自分区燃烧方法
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