JPS6264985A - Control rod aggregate - Google Patents
Control rod aggregateInfo
- Publication number
- JPS6264985A JPS6264985A JP60205751A JP20575185A JPS6264985A JP S6264985 A JPS6264985 A JP S6264985A JP 60205751 A JP60205751 A JP 60205751A JP 20575185 A JP20575185 A JP 20575185A JP S6264985 A JPS6264985 A JP S6264985A
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- fuel
- rods
- control
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
- Crushing And Grinding (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
し発明の技術分野］
本発明は、軽水型原子炉の炉心に配置される制御棒集合
体に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a control rod assembly disposed in the core of a light water nuclear reactor.
［発明の技術的背景とその問題点コ
一般に軽水型原子炉では燃料中に含まれるウラン−２３
５等の核***性物質が核***反応を起こしエネルギーを
放出すると同時に、この反応によって生じる中性子によ
ってウラン−２３８等の親物質からプルトニウム−２３
９等の有用な核***性物質が生産される。このような核
***性物質の燃焼により異なった核種の核***性物質が
再生産される比率を転換比といい、従来の軽水型原子炉
ではこのような転換比は０．６５前後であった。[Technical background of the invention and its problems] Generally, in light water reactors, uranium-23 contained in the fuel
At the same time, fissile materials such as uranium-238 undergo a fission reaction and release energy, and at the same time, the neutrons generated by this reaction convert plutonium-23 from parent materials such as uranium-238.
9 and other useful fissile materials are produced. The ratio at which fissile materials of different nuclides are reproduced by burning such fissile materials is called the conversion ratio, and in conventional light water reactors, such conversion ratio was around 0.65.
しかしながら軽水型原子炉の運転における運転コストを
低減させる必要性等からこの転換比を向上させる必要が
ある。However, there is a need to improve this conversion ratio due to the need to reduce operating costs in operating light water reactors.
現在、この燃料経済性の向上と目的とした高転換型軽水
炉の開発が行なわれており、この高転換型軽水炉では、
ウラン−２３８等からプルトニウム−２３９等への転換
比を向上ざＵるため中性子減速材を減少させ、減速材対
燃料の体積比（Ｖ。Currently, a high conversion light water reactor is being developed with the aim of improving fuel economy.
In order to improve the conversion ratio from uranium-238 etc. to plutonium-239 etc., the neutron moderator is reduced and the volume ratio of moderator to fuel (V) is reduced.
／Ｖｆ）を減少させて、中性子スペクトルを硬くした炉
心が必要となる。/Vf) and harden the neutron spectrum.
第４図および第５図はこのような高転換型軽水炉の炉心
を構成する制御棒集合体および燃料集合体を示すもので
、六角柱形の断面を有するチャンネルボックス１内に六
方格子状に配列された燃料棒２からなる燃料集合体３と
、この燃料棒２の間に挿入される複数の制御棒４が、そ
の一端を集合され接続された制御棒集合体５によって炉
心が構成される。Figures 4 and 5 show the control rod assemblies and fuel assemblies that make up the core of such a high conversion light water reactor, and are arranged in a hexagonal lattice in a channel box 1 having a hexagonal columnar cross section. A reactor core is constituted by a fuel assembly 3 made up of fuel rods 2 and a control rod assembly 5 in which a plurality of control rods 4 inserted between the fuel rods 2 are assembled and connected at one end.
すなわち高転換型軽水炉では、Ｖｍ ／Ｖｆを減少させ
るため、従来の正方格子状に配列された燃料棒からなる
燃料集合体に変わり、燃料棒２を稠密に配列することが
でき、燃料経済性を向上さけることのできる六方格子状
配列の燃料集合体３と、この燃料棒２間に挿入される制
御棒集合体５とを使用することが考えられている。In other words, in high-conversion light water reactors, in order to reduce Vm /Vf, instead of using a conventional fuel assembly consisting of fuel rods arranged in a square lattice, the fuel rods 2 can be arranged densely, which improves fuel economy. It has been considered to use fuel assemblies 3 in a hexagonal lattice arrangement, which can be avoided, and control rod assemblies 5 inserted between the fuel rods 2.
しかしながらこのようにして中性子減速材を減少さｔ！
、 Ｖ ｘ ／ Ｖ ｉを減少さＵて中性子スペクト
ルを堅くすると、ボイド発生により、さらに中性子スペ
クトルが堅くなり、ボイド反応度係数が正側へ移行しや
すくなる。したがってボイドの過剰発生による反応度の
増大が生じ、これにより反応度事故が生じる危険性があ
る。また、このようなボイドは特に燃料集合体３の中央
部付近に集中して発生するため、燃料集合体３の中央部
で出力の高くなる出力分布の不均一化が生じ、燃料集合
体３の中央部に配置された燃料棒２の燃料被覆管温度の
上昇をＩＧき、高転換型軽水炉の健全性が損われる可能
性が生じる。However, in this way the neutron moderator is reduced t!
, V x /V i are decreased to harden the neutron spectrum, the neutron spectrum becomes even harder due to void generation, and the void reactivity coefficient tends to shift to the positive side. Therefore, the reactivity increases due to the excessive generation of voids, which poses a risk of causing a reactivity accident. In addition, since such voids are particularly concentrated near the center of the fuel assembly 3, an uneven power distribution occurs in which the output becomes higher in the center of the fuel assembly 3, and the power of the fuel assembly 3 becomes uneven. There is a possibility that the temperature of the fuel cladding tube of the fuel rod 2 arranged in the center increases, and the integrity of the high conversion light water reactor is impaired.
また、このような問題を解決するために、制御棒価値の
大ぎな大径の制御棒を配置すると、燃料集合体３に配置
される燃料棒２の数が減少する、あるいはｉ制御棒の製
造コストが高くなる等の経済性の悪化を招くという問題
が生じる。In addition, in order to solve such problems, if control rods with large diameters that have a large control rod value are arranged, the number of fuel rods 2 arranged in the fuel assembly 3 will be reduced, or the production of i control rods will be reduced. A problem arises in that it leads to deterioration in economic efficiency such as increased costs.
［発明の目的］
本発明は、かかる従来の事情に対処してなされたもので
、出力分布の均一化および反応度事故に至る危険性の大
幅な低減を図ることができ、かつ経済性の悪化をＩＢり
ことのない制御棒集合体を提供しようとするものである
。[Object of the Invention] The present invention has been made in response to the above-mentioned conventional circumstances, and can uniformize the output distribution and significantly reduce the risk of reactivity accidents, and can also reduce the economic deterioration. The aim is to provide a control rod assembly that does not involve IB.
［発明の概要］
すなわち本発明は、複数の燃料棒が収容された燃料集合
体の前記燃料棒間に挿入される複数の制御棒の一端を集
合、接続されてなる制御棒集合体において、前記複数の
制御棒が、径の異なる複数種の制御棒とされ、かつ、前
記燃料集合体の周辺部に挿入される制御棒が中央部に挿
入される制御棒より径小とされたことにより、出力分布
の均一化および反応度事故に至る危険性の大幅な低減を
図ることができ、かつ、経済性の悪化を招くことにない
ようにしたものである。[Summary of the Invention] That is, the present invention provides a control rod assembly in which one ends of a plurality of control rods inserted between the fuel rods of a fuel assembly containing a plurality of fuel rods are assembled and connected. The plurality of control rods are of a plurality of types with different diameters, and the control rods inserted in the peripheral part of the fuel assembly are made smaller in diameter than the control rods inserted in the central part, This makes it possible to make the output distribution uniform and to significantly reduce the risk of reactivity accidents, and to avoid deterioration of economic efficiency.
［発明の実施例］
以下、本発明の詳細を図面に示す実施例について説明す
る。[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は、本発明の一実施例の制御棒集合体を示すもの
で、図において符号１１は制御棒集合体を示している。FIG. 1 shows a control rod assembly according to an embodiment of the present invention, and in the figure, reference numeral 11 indicates the control rod assembly.
この制御棒集合体１１は、その径が順次小径となり、そ
の制御棒価値が小となる制御棒１２ａ、１２ｂ、１２Ｃ
：（７）一端が集合サレ、接続されて構成されており、
この接続側が制御棒駆動機構（図示せず）に接続されて
いる。また、この制御棒集合体１１は、第２図に示すよ
うに、六角柱状のチャンネルボックス１３内に多数の燃
料棒１４が六方格子状に配置されてなる燃料集合体１５
の中央部に制御棒価値の大きな大径の制御棒１２ａが、
周辺部に制御棒価値の小さな小径の制御棒１２ｃが、そ
の中間に中間的な制御棒価値の中径の制御棒１２ｂが挿
入されるよう配置されている。This control rod assembly 11 has control rods 12a, 12b, and 12C whose diameters become smaller in sequence and whose control rod value becomes smaller.
:(7) One end is configured with a collective salle and connected,
This connection side is connected to a control rod drive mechanism (not shown). Further, as shown in FIG. 2, this control rod assembly 11 includes a fuel assembly 15 in which a large number of fuel rods 14 are arranged in a hexagonal lattice shape within a hexagonal columnar channel box 13.
A large-diameter control rod 12a with great control rod value is located in the center of the
A small diameter control rod 12c having a small control rod value is inserted at the periphery, and a medium diameter control rod 12b having an intermediate control rod value is inserted between the small diameter control rods 12c.
上記構成のこの実施例の制御棒集合体１１では、高転換
型軽水炉の炉心内に配置された燃料集合体１５内に制御
棒駆動機構により上方または下方より挿入され、炉心内
の核反応の制御が行なわれる。The control rod assembly 11 of this embodiment having the above configuration is inserted into the fuel assembly 15 disposed in the core of a high conversion light water reactor from above or below by a control rod drive mechanism to control the nuclear reaction in the reactor core. will be carried out.
したがって、ボイド反応度係数が正となり、このボイド
が多量に発生し、出力の高くなる燃料集合体１５の中心
部の出力をその周辺部に比べてより多く抑制し、出力分
布を平坦化することができ、燃料集合体１５の中心部に
配置される燃料棒１４の被覆管温度上昇の抑制、および
反応度事故を起こす危険性の低減を行なうことができ、
高転換型軽水炉の健全性、安全性の向上を図ることがで
きる。また、燃料集合体１５の周辺部には、中心部に配
置された制御棒１２ａに比べて小径の制御棒１２ｂ、１
２ｃが配置されているので、経済性の悪化を招くことも
ない。Therefore, the void reactivity coefficient becomes positive, a large amount of voids are generated, and the output at the center of the fuel assembly 15, where the output is high, is suppressed more than at the periphery, and the output distribution is flattened. It is possible to suppress the temperature rise of the cladding tube of the fuel rod 14 arranged in the center of the fuel assembly 15, and to reduce the risk of causing a reactivity accident.
It is possible to improve the integrity and safety of high-conversion light water reactors. Further, control rods 12b, 1, which have a smaller diameter than the control rod 12a arranged in the center, are arranged in the peripheral part of the fuel assembly 15.
2c, there is no possibility of deterioration of economic efficiency.
なお、この実施例では、六角柱状のチャンネルボックス
１３内に六方格子状に燃料棒１４が収容された燃料集合
体１５を配置された炉心について説明したが、本発明は
かかる実施例に限定されるものではなく、第３図に示す
ように、四角柱状のチャンネルボックス１３ａ内に正方
格子状に燃料棒１４が配置された燃料集合体１５ａが配
置された炉心においても前述の実施例と同様に、中心部
に制御棒価値の大きな大径の制御棒１２ａを配置し、周
辺に向かうに従って制御棒価値の小となる制御棒１２ｂ
、１２ｃを配置した制御棒集合体を配置することにより
、同様な効果を得ることができる。また、制御棒は、制
御棒価値が異なり、径の異なる３種類の制御棒１２ａ、
１２ｂ、１２ｃとしたが、燃料集合体の中心部に制御棒
価値の大きな大径の制御棒を配置し、周辺部に制御棒価
値の小ざな小径の制御棒を配置すれば、制御棒の種類は
、たとえば２種類、４種類等としてもよいことはもちろ
んである。Although this embodiment describes a core in which a fuel assembly 15 in which fuel rods 14 are housed in a hexagonal lattice shape is arranged in a hexagonal columnar channel box 13, the present invention is limited to this embodiment. As shown in FIG. 3, even in a core in which a fuel assembly 15a in which fuel rods 14 are arranged in a square lattice shape in a square columnar channel box 13a is arranged, as in the above-mentioned embodiment, A large-diameter control rod 12a with a high control rod value is arranged in the center, and control rods 12b with a control rod value decreasing toward the periphery.
, 12c can be used to obtain a similar effect. In addition, the control rods include three types of control rods 12a with different control rod values and different diameters,
12b and 12c, but if a large diameter control rod with a high control rod value is placed in the center of the fuel assembly, and a small diameter control rod with a small control rod value is placed in the periphery, the type of control rod can be changed. Of course, there may be two types, four types, etc., for example.
［発明の効果〕
以上述べたように本発明の制御棒集合体では、径が異な
り、制御棒価値に異なる制御棒を、燃料集合体の中心部
に制御棒価値の大きな大径の制御棒が挿入されるよう配
置し、周辺部に制御棒価値の小さな小径の制御棒が挿入
されるよう配置したので、出力分布の均一化および反応
度事故に至る危険性の大幅な低減を図ることができ、か
つ、経済性の悪化を招くこともない。[Effects of the Invention] As described above, in the control rod assembly of the present invention, control rods with different diameters and different control rod values are used, and a large diameter control rod with a high control rod value is placed in the center of the fuel assembly. By arranging the control rods so that they can be inserted, and by arranging the control rods so that small-diameter control rods with low control rod value are inserted in the peripheral area, it is possible to equalize the power distribution and significantly reduce the risk of reactivity accidents. , and does not cause deterioration in economic efficiency.
第１図は本発明の一実施例の制御棒集合体を示す側面図
、第２図は第１図に示す制御棒集合体を配置された燃料
集合体を示す上面図、第３図は他の実施例の制御棒集合
体が配置された燃料集合体を示す正面図、第４図は従来
の制御棒集合体を示゛す側面図、第５図は第４図に示さ
れる制御棒集合体が配置された燃料集合体を示す上面図
である。
１１・・・・・・・・・制御棒集合体
１２ａ、１２ｂ、１２ｃｍ・・制御棒
１３・・・・・・・・・チャンネルボックス１４・・・
・・・・・・燃料棒
１５・・・・・・・・・燃料集合体
第１図
第３図
第４図FIG. 1 is a side view showing a control rod assembly according to an embodiment of the present invention, FIG. 2 is a top view showing a fuel assembly in which the control rod assembly shown in FIG. 1 is arranged, and FIG. 4 is a side view showing a conventional control rod assembly, and FIG. 5 is a control rod assembly shown in FIG. 4. FIG. 2 is a top view showing a fuel assembly in which a fuel body is arranged. 11... Control rod assembly 12a, 12b, 12cm... Control rod 13... Channel box 14...
・・・・・・Fuel rod 15・・・・・・Fuel assembly Fig. 1 Fig. 3 Fig. 4
Claims (1)
棒間に挿入される複数の制御棒の一端を集合、接続され
てなる制御棒集合体において、前記複数の制御棒が、径
の異なる複数種の制御棒とされ、かつ、前記燃料集合体
の周辺部に挿入される制御棒が中央部に挿入される制御
棒より径小とされたことを特徴とする制御棒集合体。(1) In a control rod assembly formed by gathering and connecting one end of a plurality of control rods inserted between the fuel rods of a fuel assembly containing a plurality of fuel rods, the plurality of control rods have a diameter 1. A control rod assembly comprising a plurality of types of control rods having different types of control rods, the control rods being inserted into the periphery of the fuel assembly have a smaller diameter than the control rods being inserted into the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60205751A JPS6264985A (en) | 1985-09-18 | 1985-09-18 | Control rod aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60205751A JPS6264985A (en) | 1985-09-18 | 1985-09-18 | Control rod aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6264985A true JPS6264985A (en) | 1987-03-24 |
Family
ID=16512052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60205751A Pending JPS6264985A (en) | 1985-09-18 | 1985-09-18 | Control rod aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6264985A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4855100A (en) * | 1988-03-02 | 1989-08-08 | Westinghouse Electric Corp. | Reconstitutable control rod spider assembly |
| US4993864A (en) * | 1988-12-15 | 1991-02-19 | Westinghouse Electric Corp. | Reconstitutable control assembly having removable control rods with detachable split upper end plugs |
-
1985
- 1985-09-18 JP JP60205751A patent/JPS6264985A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4855100A (en) * | 1988-03-02 | 1989-08-08 | Westinghouse Electric Corp. | Reconstitutable control rod spider assembly |
| US4993864A (en) * | 1988-12-15 | 1991-02-19 | Westinghouse Electric Corp. | Reconstitutable control assembly having removable control rods with detachable split upper end plugs |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0204288B1 (en) | Fuel assembly | |
| JPH058797B2 (en) | ||
| EP0196655A1 (en) | Fuel assembly for nuclear reactor | |
| JPS6264985A (en) | Control rod aggregate | |
| JPS6171389A (en) | Fuel aggregate | |
| EP0051441A1 (en) | Nuclear reactor and fuel assembly therefor | |
| JP3062770B2 (en) | Fuel assembly structure | |
| JPS62194494A (en) | Fuel aggregate | |
| JPS6361990A (en) | Fuel aggregate | |
| JPS60201284A (en) | Fuel aggregate | |
| JPH0342438B2 (en) | ||
| JPH0552475B2 (en) | ||
| JPH11258374A (en) | Fuel element for thermal neutron furnace and fuel assembly | |
| JPS62195590A (en) | Fuel aggregate for boiling water type reactor | |
| JPS62179690A (en) | Nuclear reactor core | |
| JPS6276489A (en) | Core structure of nuclear reactor | |
| JPS63172990A (en) | Nuclear-reactor fuel aggregate | |
| JPS58131588A (en) | Boiling-water reactor | |
| JPS59221695A (en) | Fuel assembly | |
| JPS61147184A (en) | Fuel aggregate | |
| JPS5895286A (en) | Fuel assembly | |
| JPS63231293A (en) | Core for nuclear reactor | |
| JPS62182694A (en) | Fuel aggregate for boiling water type reactor | |
| JPS6275289A (en) | Core structure of nuclear reactor | |
| JPS622190A (en) | Nuclear reactor |