JPS6055290A - Neutron absorber element for nuclear reactor stop device - Google Patents
Neutron absorber element for nuclear reactor stop deviceInfo
- Publication number
- JPS6055290A JPS6055290A JP58162556A JP16255683A JPS6055290A JP S6055290 A JPS6055290 A JP S6055290A JP 58162556 A JP58162556 A JP 58162556A JP 16255683 A JP16255683 A JP 16255683A JP S6055290 A JPS6055290 A JP S6055290A
- Authority
- JP
- Japan
- Prior art keywords
- neutron absorber
- absorber element
- core
- reactor
- nuclear reactor
- 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Vibration Dampers (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】
［発明の技術分野］
本発明は、黒鉛減速ガス冷却型原子炉において、原子炉
を安全に停止させる原子炉停止装置用の中性子吸収体素
子に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a neutron absorber element for a reactor shutdown device for safely shutting down a nuclear reactor in a graphite-moderated gas-cooled nuclear reactor.
［発明の技術的背景とその問題点］
黒鉛減速ガス冷却型原子炉においては、通常原子炉の反
応度を制御する制御棒装置と、制御棒装置が万一作動不
能となるような事態が生じても原子炉を安全に停止出来
るように後備の原子炉停止装置が設けられている。一般
に、制御棒装置と後備の原子炉停止装置は、原子炉の安
全性面から動作原理が異る独立した系統構成をしている
。即ち、制御棒装置は、電動機によって制御棒を駆動し
、炉心内に挿入、又は炉心からの引き抜きを行い、原子
炉の反応度を制御するものであり、後備の原子炉停止装
置は、球状又はペレッｌ−状の小さな中性子吸収体素子
を炉心上部に設けられたホッパー内に多数装填しておき
、作動時にはポツパー下部の素子流出口を何等かの方法
によって開き、中性子吸収体素子を炉心内に流出投下さ
せて原子炉を停止させるものである。[Technical background of the invention and its problems] In a graphite-moderated gas-cooled nuclear reactor, there is a possibility that the control rod device that controls the reactivity of the reactor and the control rod device may become inoperable. A back-up reactor shutdown system is installed to safely shut down the reactor even in the event of a nuclear accident. Generally, the control rod device and the back-up reactor shutdown device have independent system configurations with different operating principles from the standpoint of reactor safety. In other words, the control rod device controls the reactivity of the reactor by driving the control rods using an electric motor, inserting them into the reactor core, or withdrawing them from the core. A large number of small pellet-shaped neutron absorber elements are loaded into a hopper installed at the top of the reactor core, and during operation, the element outlet at the bottom of the hopper is opened by some method, and the neutron absorber elements are inserted into the core. It is used to shut down a nuclear reactor by dropping it.
後備の原子炉停止装置は、一般に使用される礪会は非常
に少いが、一度使用されると原子炉を再起動させるため
に炉心に投下された中性子吸収体素子を回収しなければ
ならない。従来、後備の原子炉停止装置に用いられる中
性子吸収体素子は、炭化ボロン（Ｂ、Ｃ）又はＢ４Ｃと
黒鉛粉末との混合焼結された球状又はペレット状のもの
である。このような中性子吸収体素子の炉心からの回収
は、真空回収装置によって吸い上げ方式で行われている
。このような回収方式では真空装置は吸込みガスの処理
設備、真空系等を有し、使用される機会が極めて少い設
備にしてはかなり高価なものとなっている上、回収作業
も大がかりになり長時間を必要としている。Backup reactor shutdown equipment is generally used very rarely, but once it is used, the neutron absorber elements dropped into the reactor core must be recovered in order to restart the reactor. Conventionally, neutron absorber elements used in back-up nuclear reactor shutdown equipment are spherical or pellet-shaped elements made by mixing and sintering boron carbide (B, C) or B4C with graphite powder. Such neutron absorber elements are recovered from the core using a vacuum recovery system. In this type of recovery method, the vacuum equipment has suction gas processing equipment, a vacuum system, etc., and is quite expensive for equipment that is rarely used, and the recovery work is also large-scale. It requires a long time.
［発明の目的］
本発明の目的とＪるところは、炉心に投下された中性子
吸収体素子の回収が容易で、かつ回収装置も簡単で安価
なものに出来る原子炉停止装置用の中性子吸収体素子を
提供することである。[Objective of the Invention] The object of the present invention is to provide a neutron absorber for a nuclear reactor shutdown system, which allows easy recovery of neutron absorber elements dropped into a reactor core, and which allows the recovery device to be simple and inexpensive. The purpose is to provide an element.
［発明の概要］
本発明による原子炉停止装置用の中性子吸収体素子は、
磁性体を核心とし、外側に８４．Ｃ又はＢ４Ｃと黒鉛粉
末とを被覆して構成したことを特徴としている。[Summary of the invention] The neutron absorber element for a nuclear reactor shutdown device according to the present invention has the following features:
The core is made of magnetic material, and the outside is 84. It is characterized by being constructed by coating C or B4C with graphite powder.
［発明の実施例］
次に図面を参照して本発明の一実施例を説明する。第１
図は本発明の中性子吸収体素子が適用される原子炉停止
装置の概念を示す図である。図かられかるように、原子
炉停止装置は、炉心１０の上方に配置され、中性子吸収
体素子３と、中性子吸収体が装填されるホッパー２と、
作動時に加圧破裂されるラブチャ−ディスク４と、作動
時にホッパーを加圧する加圧系１と、作動時にホッパー
から流出する中性子吸収体素子を炉心挿入孔６に導く案
内管５とから構成されている。[Embodiment of the Invention] Next, an embodiment of the present invention will be described with reference to the drawings. 1st
The figure is a diagram showing the concept of a nuclear reactor shutdown device to which the neutron absorber element of the present invention is applied. As can be seen from the figure, the reactor shutdown device is arranged above the reactor core 10, and includes a neutron absorber element 3, a hopper 2 in which the neutron absorber is loaded,
It is composed of a loveture disk 4 that is ruptured under pressure during operation, a pressurization system 1 that pressurizes the hopper during operation, and a guide tube 5 that guides the neutron absorber element flowing out from the hopper during operation to the core insertion hole 6. There is.
第２図は本発明の中性子吸収体素子の一実施例ね示す図
である。図かられかるように、本実施例は重量を軽減す
るために、中空になった磁性体の核心７を中性子吸収材
（Ｂ４Ｃ又はＢ、Ｃと黒鉛粉末との混合焼結体）８で被
覆したもので、磁石によって吸引されるように構成され
ている。本実施例では核心に中空球を用いているが必ず
しも中空球である必要はなく中実球であっても、多角形
であっても良く、要は磁性体材料であることが重要な点
である。FIG. 2 is a diagram showing one embodiment of the neutron absorber element of the present invention. As can be seen from the figure, in this example, in order to reduce the weight, the hollow core 7 of the magnetic material is covered with a neutron absorbing material (B4C or a mixed sintered body of B, C and graphite powder) 8. It is designed to be attracted by a magnet. In this example, a hollow sphere is used as the core, but it does not necessarily have to be a hollow sphere; it may be a solid sphere or a polygon, and the important point is that it is made of magnetic material. be.
以上のように構成された本発明の中性子吸収体素子は、
原子炉停止装置の作動によって炉心′に投下された後の
回収が容易で、かつ回収装置も簡単で安価なものにする
ことが出来る。即ち、何等かの条件で原子炉停止装置の
作動が行われると、加圧系１よりホッパー２が加圧され
、ラブチャーディスク４が破裂し、ホッパー内の中性子
吸収体素子３が流出し、案内管５を通って炉心１０の挿
入孔６内に堆積し、炉心１０の反応度を下げて原子炉を
安全に停止させる。原子炉を再起動するために、炉心挿
入孔内の中性子吸収体素子を回収するときは、炉心１０
が低温になった状態で冷却ガスを減圧し、ホッパー２、
案内管５を取り除き、第３図のように電磁石棒９を挿入
孔６内に挿入する第３図に挿入孔６内に電磁石棒９を挿
入したときの状態を概念的に示しているが、図示された
ように中性子吸収体素子３は電磁石棒９に吸引される中
性子吸収体素子３を吸引させた状態で電磁石棒９を上方
に移動させ炉心外に運び出し、所定の中性子吸収体素子
容器内において、電磁石を消磁させ、中性子吸収体素子
３を回収することが出来るこのように、電磁石棒９によ
る回収方式は回収装置が簡略化され信頼性も高く安価な
ものとなる。The neutron absorber element of the present invention configured as described above is
By operating the reactor shutdown device, it is easy to recover the fuel after it has been dropped into the reactor core, and the recovery device can also be made simple and inexpensive. That is, when the reactor shutdown device is activated under certain conditions, the hopper 2 is pressurized by the pressurization system 1, the rupture disk 4 ruptures, and the neutron absorber element 3 inside the hopper flows out. It passes through the guide tube 5 and is deposited in the insertion hole 6 of the reactor core 10, lowering the reactivity of the reactor core 10 and safely stopping the reactor. When recovering the neutron absorber elements in the core insertion hole in order to restart the reactor, the core 10
When the temperature is low, the cooling gas is depressurized and the hopper 2,
The guide tube 5 is removed and the electromagnetic rod 9 is inserted into the insertion hole 6 as shown in FIG. 3. FIG. 3 conceptually shows the state when the electromagnetic rod 9 is inserted into the insertion hole 6. As shown in the figure, the neutron absorber element 3 is transported out of the reactor core by moving the electromagnetic rod 9 upward with the neutron absorber element 3 being attracted by the electromagnetic rod 9, and placed in a predetermined neutron absorber element container. In this way, the collection method using the electromagnetic rod 9 simplifies the collection device and is highly reliable and inexpensive, since the electromagnet can be demagnetized and the neutron absorber element 3 can be collected.
［発明の効果］
以上のように本発明によれば、核心が磁性体で作り、そ
の外周を中性子吸収材で被覆したことにより、炉心に投
下された後の回収が電磁石棒を用いることにより、容易
に回収することができる。[Effects of the Invention] As described above, according to the present invention, the core is made of a magnetic material and the outer periphery is coated with a neutron absorbing material. Can be easily recovered.
また回収装置も簡略化され安価なものとなる。Moreover, the collection device is also simplified and inexpensive.
さらには、回収に要する作業時間が短縮され経済性効果
は大である。Furthermore, the working time required for collection is shortened, which has a large economical effect.
第１図は本発明による中性子吸収体素子の適用場所を示
す原子炉停止装置の概略図、第２図は本発明による原子
炉停止装置用の中性子吸収体素子の一実施例を一部切断
して示す斜視図、第３図は本発明を適用した場合の回収
り式を示す原子炉停止装置の概略図である。
１・・・加圧系 ２・・・ホッパー
３・・・中性子吸収体素子
４・・・ラブチャーディスク
５・・・案内管 ６・・・炉心挿入孔
７・・・磁性体核心 ８・・・中性子吸収材１０・・・
炉心
代理人Ｊｆ理−Ｌ Ｊ川 近点イ右（１，１か１名）第
１図
第 ２ 図
第 ３ 図
□−
し
ｑFIG. 1 is a schematic diagram of a nuclear reactor shutdown system showing the application location of the neutron absorber element according to the present invention, and FIG. 2 is a partially cutaway view of an embodiment of the neutron absorber element for the nuclear reactor shutdown system according to the present invention. FIG. 3 is a schematic diagram of a nuclear reactor shutdown system showing a recovery method to which the present invention is applied. 1... Pressure system 2... Hopper 3... Neutron absorber element 4... Loveture disk 5... Guide tube 6... Core insertion hole 7... Magnetic core 8...・Neutron absorber 10...
Core agent Jf - L J River Periapsis A right (1, 1 or 1 person) Figure 1 Figure 2 Figure 3 Figure □ - Shi q
Claims (2)
おいて、核心が磁性体で、その外周を中性子吸収材で被
覆したことを特徴とする原子炉停止装置用の中性子吸収
体素子。(1) A neutron absorber element for use in a nuclear reactor shutdown device, characterized in that the core is a magnetic material and the outer periphery is coated with a neutron absorbing material.
特許請求の範囲第１項記載の原子炉停止装置用の中性子
吸収体素子。(2) A neutron absorber element for a nuclear reactor shutdown device according to claim 1, wherein the core is made of a hollow magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58162556A JPS6055290A (en) | 1983-09-06 | 1983-09-06 | Neutron absorber element for nuclear reactor stop device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58162556A JPS6055290A (en) | 1983-09-06 | 1983-09-06 | Neutron absorber element for nuclear reactor stop device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6055290A true JPS6055290A (en) | 1985-03-30 |
Family
ID=15756830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58162556A Pending JPS6055290A (en) | 1983-09-06 | 1983-09-06 | Neutron absorber element for nuclear reactor stop device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055290A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6517764B2 (en) | 2000-02-10 | 2003-02-11 | Sanwa Kako Co., Ltd. | Method of making polyethylene resinous open cell cellular bodies |
| JP2013015375A (en) * | 2011-07-01 | 2013-01-24 | Toshiba Corp | Reactivity suppression method for nuclear fuel and reactivity suppression device therefor |
| JP6032689B1 (en) * | 2015-09-28 | 2016-11-30 | 公益財団法人原子力バックエンド推進センター | Fuel debris retrieval method |
-
1983
- 1983-09-06 JP JP58162556A patent/JPS6055290A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6517764B2 (en) | 2000-02-10 | 2003-02-11 | Sanwa Kako Co., Ltd. | Method of making polyethylene resinous open cell cellular bodies |
| JP2013015375A (en) * | 2011-07-01 | 2013-01-24 | Toshiba Corp | Reactivity suppression method for nuclear fuel and reactivity suppression device therefor |
| JP6032689B1 (en) * | 2015-09-28 | 2016-11-30 | 公益財団法人原子力バックエンド推進センター | Fuel debris retrieval method |
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