JP2011257230A - Fluoride residue recovery device - Google Patents

Fluoride residue recovery device Download PDF

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JP2011257230A
JP2011257230A JP2010131058A JP2010131058A JP2011257230A JP 2011257230 A JP2011257230 A JP 2011257230A JP 2010131058 A JP2010131058 A JP 2010131058A JP 2010131058 A JP2010131058 A JP 2010131058A JP 2011257230 A JP2011257230 A JP 2011257230A
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residue
fluoridation
gate valve
fluoride
fluorination
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JP5593525B2 (en
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Kuniyoshi Hoshino
国義 星野
Hidenori Oikawa
英紀 及川
Takao Hanawa
隆雄 塙
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Hitachi GE Nuclear Energy Ltd
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    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Abstract

PROBLEM TO BE SOLVED: To provide a fluoride residue recovery device which is capable of preventing a fluorine gas and a radioactive substance from leaking to the outside of a fluorine atmosphere system and of preventing production of HF and material corrosion due to the HF by mixing moisture into the fluorine atmosphere system to react the moisture with an Fgas.SOLUTION: First and second fluoride residue recovery containers 7A and 7B are serially connected on the downstream side of a flame reactor 4. When an amount of fluoride residue deposited on a bottom of the flame reactor reaches a predetermined amount, a control device 10 opens a first gate valve 8A to transfer the fluoride residue deposited on the bottom of the flame reactor to the first fluoride residue recovery container 7A. After this transfer of the residue, the control device 10 closes the first gate valve 8A and opens a second gate valve 8B to transfer the fluoride residue in the first fluoride residue recovery container 7A to the second fluoride residue recovery container 7B. After this transfer of the residue, the control device 10 closes the second gate valve 8B and opens a third gate valve 8C to transfer the fluoride residue in the second fluoride residue recovery container 7B to an oxide conversion step.

Description

本発明は、原子力発電所から発生する使用済核燃料の再処理に用いるフッ化物残渣回収装置に関する。   The present invention relates to a fluoride residue recovery device used for reprocessing spent nuclear fuel generated from a nuclear power plant.

現在、原子力発電所から発生する使用済核燃料の再処理技術の主流は、溶媒抽出法を用いたＰＵＲＥＸ法であり、この方法では製品であるＵ、ＭＯＸ（またはＰｕ）は高精製度で回収される。しかし、ＰＵＲＥＸ法は主工程において溶媒抽出という大型の分離体系を必要とすることや大量の液体廃棄物が発生することから再処理コストが高い傾向であるとされ、経済性を向上させるために施設の小型化や廃棄物量の低減を図る必要がある。   Currently, the mainstream of reprocessing technology for spent nuclear fuel generated from nuclear power plants is the PUREX method using a solvent extraction method, in which U and MOX (or Pu) products are recovered with high purity. The However, the PUREX method requires a large separation system called solvent extraction in the main process, and a large amount of liquid waste is generated, so the reprocessing cost tends to be high. It is necessary to reduce the size and waste amount.

一方、乾式再処理法のひとつに、１９８０年代まで開発が継続されたフッ化物揮発法がある。この方法は小型の設備で高精製度のＵを回収できるという利点があるが、Ｐｕの精製が難しいという課題がある。   On the other hand, as one of the dry reprocessing methods, there is a fluoride volatilization method that has been developed until the 1980s. This method has an advantage that U having a high degree of purification can be recovered with a small equipment, but there is a problem that purification of Pu is difficult.

そこで、溶媒抽出法の上流にフッ化物揮発法によるＵの分離精製工程を設けることで、溶媒抽出法設備を小型化するとともに、Ｐｕの精製が難しいというフッ化物揮発法の課題を補う相補的なハイブリット再処理法であるＦＬＵＯＲＥＸ法の開発が行われている（例えば、特許文献１，非特許文献１参照）。   Therefore, by providing a U separation / purification step upstream of the solvent extraction method, the size of the solvent extraction method equipment can be reduced, and a complementary method to supplement the problem of the fluoride volatilization method, which is difficult to purify Pu. The FLUOREX method, which is a hybrid reprocessing method, has been developed (see, for example, Patent Document 1 and Non-Patent Document 1).

ＦＬＵＯＲＥＸ法では、使用済核燃料の大部分を占めるＵの内、９０％以上をフッ化工程においてフッ化反応により気体状のＵＦ６に転換して揮発させ、分離する。即ち、脱被覆工程で、使用済核燃料を粉体状にする。この粉体状の酸化物と高濃度のＦ２ガスを塔状のフレーム炉に導入し、１２００℃程度の温度で燃料中のＵをＵＦ６に転換する。このＵＦ６は蒸留器や吸着材によって精製することができる。この製品ＵはＵ濃縮に用いるＵＦ６の化学形態であるため、転換施設を介することなくＵ濃縮、転換施設で使用でき、燃料として再利用できる。Ｕの大部分を除去した残りの１０％以下のＵとＰｕおよび不揮発性のＦＰのフッ化物は、酸化物転換工程において水蒸気と反応させ酸化物に転換した後、硝酸に溶解し、溶媒抽出法の手法を用いて精製する。 In the FLUOREX method, 90% or more of U occupying most of the spent nuclear fuel is converted into gaseous UF 6 by a fluorination reaction in the fluorination step, volatilized and separated. That is, the spent nuclear fuel is powdered in the decoating process. This powdery oxide and high-concentration F 2 gas are introduced into a tower-like flame furnace, and U in the fuel is converted to UF 6 at a temperature of about 1200 ° C. This UF 6 can be purified by a still or adsorbent. Since this product U is a chemical form of UF 6 used for U enrichment, it can be used in U enrichment and conversion facilities without going through a conversion facility, and can be reused as fuel. The remaining 10% or less of U, Pu, and non-volatile FP fluoride from which most of U has been removed react with water vapor in the oxide conversion step to be converted to oxide, and then dissolved in nitric acid. Purify using the method of

特開２００２−２５７９８０号公報JP 2002-257980 A

火力原子力発電 Ｖｏｌ．５４ Ｎｏ．１２ （Ｄｅｃ．２００３）Thermal nuclear power generation Vol. 54 No. 12 (Dec. 2003)

フッ化工程で生成した不揮発性のフッ化物であるフッ化残渣を回収し、次工程である酸化物転換工程へ送る際には、水分を含む空気の混入、フッ素ガスの漏洩および次工程で使用する水蒸気のフッ化工程への混入を防止する必要がある。これは、フッ化工程ではフッ素を利用するため、水分を含む空気および水蒸気の混入により生成されたフッ化水素（ＨＦ）による材料腐食への影響を小さくする必要がある。また、ＨＦは生体に対して極めて浸透性が強いので、例え希薄でもＨＦの吸入やＨＦに接触することのないように漏洩防止が必要とされている。また、放射線防護の観点から放射性粉体であるフッ化残渣の漏洩防止も必要である。したがって、フッ素雰囲気であるフッ化工程から酸化物転換工程へのフッ化残渣の回収において、放射性物質及びフッ素雰囲気と系外との隔離を可能とするフッ化残渣回収装置が必要である。   When collecting the fluoride residue, which is a non-volatile fluoride produced in the fluorination process, and sending it to the oxide conversion process, which is the next process, air containing moisture, leakage of fluorine gas, and use in the next process It is necessary to prevent mixing of water vapor into the fluorination process. This is because fluorine is used in the fluorination step, and therefore it is necessary to reduce the influence on the material corrosion caused by hydrogen fluoride (HF) generated by mixing of air containing moisture and water vapor. In addition, since HF is extremely permeable to living organisms, it is necessary to prevent leakage even if it is dilute so that HF is not inhaled or contacted with HF. In addition, from the viewpoint of radiation protection, it is also necessary to prevent leakage of fluoride residue, which is a radioactive powder. Therefore, in the recovery of the fluoridation residue from the fluorination step, which is a fluorine atmosphere, to the oxide conversion step, there is a need for a fluoridation residue recovery device that can isolate the radioactive substance and the fluorine atmosphere from the outside of the system.

また、稼働率向上の観点から、フッ化処理を中断することなくフッ化残渣を回収することが必要である。   Moreover, it is necessary to collect | recover a fluoride residue, without interrupting a fluorination process from a viewpoint of an operation rate improvement.

本発明の目的は、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できるフッ化物残渣回収装置を提供することにある。また、フッ化処理を中断することなくフッ化物残渣を回収することのできるフッ化物残渣回収装置を提供することにある。 An object of the present invention is to prevent leakage of fluorine gas and radioactive substances outside the fluorine atmosphere system when recovering non-volatile U, Pu and FP fluoride radioactive powders from the fluorination process in a fluorine atmosphere. Another object of the present invention is to provide a fluoride residue recovery device capable of preventing HF generation and material corrosion due to HF by mixing moisture into the fluorine atmosphere system and reacting with F 2 gas. Moreover, it is providing the fluoride residue collection | recovery apparatus which can collect | recover a fluoride residue, without interrupting a fluorination process.

（１）上記目的を達成するために、本発明は、フレーム炉におけるフッ化工程で生じた固体フッ化物粉末をフッ化残渣回収容器により回収するフッ化残渣回収装置であって、前記フッ化残渣回収容器は、前記フレーム炉の下流側に直列に接続された第１及び第２のフッ化残渣回収容器からなり、前記フレーム炉と前記第１のフッ化残渣回収容器との間を仕切る第１の仕切り弁と、前記第１のフッ化残渣回収容器と前記第２のフッ化残渣回収容器との間を仕切る第２の仕切り弁と、前記第２のフッ化残渣回収容器の下流側に設けられた第３の仕切り弁と、前記第１から第３の仕切り弁の開閉を制御する制御手段を備え、前記制御手段は、前記フレーム炉の底部に堆積したフッ化残渣が所定量になると、前記第１の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第１のフッ化残渣回収容器に移送させ、残渣移送後、前記第１の仕切り弁を閉とし、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を前記第２のフッ化残渣回収容器に移送させ、残渣移送後、前記第２の仕切り弁を閉とし、前記第３の仕切り弁を開とし、前記第２のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させるようにしたものである。
かかる構成により、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できるものとなる。 (1) In order to achieve the above object, the present invention is a fluoridation residue recovery device for recovering solid fluoride powder generated in a fluorination step in a flame furnace with a fluoridation residue recovery container, wherein the fluorination residue The recovery container includes first and second fluoridation residue recovery containers connected in series on the downstream side of the flame furnace, and a first partition that partitions between the flame furnace and the first fluorination residue recovery container. A gate valve, a second gate valve for partitioning the first fluoride residue recovery container and the second fluoride residue recovery container, and a downstream side of the second fluoride residue recovery container And the control means for controlling the opening and closing of the first to third gate valves, the control means, when the fluoride residue deposited on the bottom of the frame furnace reaches a predetermined amount, The first gate valve is opened, and the frame Fluoride residue accumulated in the furnace is transferred to the first fluoridation residue recovery container, and after the residue transfer, the first gate valve is closed, the second gate valve is opened, and the first gate valve is opened. The fluoride residue in the fluoride residue collection container is transferred to the second fluoride residue collection container, and after the residue transfer, the second gate valve is closed, the third gate valve is opened, and the first The fluoridation residue in 2 fluoridation residue collection containers is transferred to the oxide conversion step.
With such a configuration, it is possible to prevent leakage of fluorine gas and radioactive material to the outside of the fluorine atmosphere system when recovering non-volatile U, Pu and FP fluoride radioactive powder from the fluorination step which is a fluorine atmosphere. At the same time, moisture is mixed into the fluorine atmosphere system, and HF generation and material corrosion due to HF can be prevented by reaction with F 2 gas.

（２）上記（１）において、好ましくは、前記第１のフッ化残渣回収容器に接続される第１のガス置換装置および第４の仕切り弁と、前記第２のフッ化残渣回収容器に接続される第２のガス置換装置および第５の仕切り弁とを備え、前記制御手段は、前記第１のフッ化残渣回収容器にフッ化残渣を移送後、前記第４の仕切り弁を開とし、前記ガス置換装置により、前記第１のフッ化残渣回収容器内のガスを不活性ガスに置換し、前記第５の仕切り弁を開とし、前記第２のガス置換装置により、前記第２のフッ化残渣回収容器内のガスを不活性ガスに置換した後、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を前記第２のフッ化残渣回収容器に移送させるようにしたものである。   (2) In the above (1), preferably, the first gas displacement device and the fourth gate valve connected to the first fluorination residue collection container and the second fluorination residue collection container are connected. A second gas replacement device and a fifth gate valve, wherein the control means opens the fourth gate valve after transferring the fluoride residue to the first fluoride residue recovery container, The gas replacement device replaces the gas in the first fluoridation residue recovery container with an inert gas, opens the fifth gate valve, and the second gas replacement device opens the second hook. After replacing the gas in the chemical residue collection container with an inert gas, the second gate valve is opened, and the fluoride residue in the first fluoride residue collection container is replaced with the second fluoride residue collection container. It is made to move to.

（３）上記目的を達成するために、本発明は、フレーム炉におけるフッ化工程で生じた固体フッ化物粉末をフッ化残渣回収容器により回収するフッ化残渣回収装置であって、前記フッ化残渣回収容器は、前記フレーム炉の下流側に並列に接続された第１及び第２のフッ化残渣回収容器からなり、前記フレーム炉と前記第１のフッ化残渣回収容器との間を仕切る第１の仕切り弁と、前記第１のフッ化残渣回収容器の下流側に設けられた第２の仕切り弁と、前記フレーム炉と前記第２のフッ化残渣回収容器との間を仕切る第３の仕切り弁と、前記第２のフッ化残渣回収容器の下流側に設けられた第４の仕切り弁と、前記第１から第４の仕切り弁の開閉を制御する制御手段を備え、前記制御手段は、前記フレーム炉の底部に堆積したフッ化残渣が所定量になると、前記第１の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第１のフッ化残渣回収容器に移送させ、残渣移送後、前記第１の仕切り弁を閉とし、残渣移送後、前記第１の仕切り弁を閉とし、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させ、前記第３の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第２のフッ化残渣回収容器に移送させ、残渣移送後、前記第３の仕切り弁を閉とし、前記第４の仕切り弁を開とし、前記第２のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させるようにしたものである。
かかる構成により、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できるものとなる。 (3) In order to achieve the above object, the present invention provides a fluoridation residue recovery apparatus for recovering solid fluoride powder generated in a fluorination step in a flame furnace with a fluoridation residue recovery container, The recovery container includes first and second fluoridation residue recovery containers connected in parallel to the downstream side of the flame furnace, and a first partition that partitions between the flame furnace and the first fluorination residue recovery container. A second partition valve provided downstream of the first fluorination residue collection container, and a third partition partitioning the frame furnace and the second fluorination residue collection container A valve, a fourth gate valve provided on the downstream side of the second fluoridation residue recovery container, and a control means for controlling opening and closing of the first to fourth gate valves, the control means, Fluoride residue deposited on the bottom of the flame furnace When the amount reaches, the first gate valve is opened, the fluoridation residue accumulated in the flame furnace is transferred to the first fluoridation residue recovery container, and after the residue is transferred, the first gate valve is closed. And after the residue transfer, the first gate valve is closed, the second gate valve is opened, the fluoride residue in the first fluoride residue recovery container is transferred to the oxide conversion step, The third gate valve is opened, the fluoridation residue accumulated in the flame furnace is transferred to the second fluoridation residue recovery container, and after the residue transfer, the third gate valve is closed, and the fourth The gate valve is opened and the fluoridation residue in the second fluoridation residue recovery container is transferred to the oxide conversion step.
With such a configuration, it is possible to prevent leakage of fluorine gas and radioactive material to the outside of the fluorine atmosphere system when recovering non-volatile U, Pu and FP fluoride radioactive powder from the fluorination step which is a fluorine atmosphere. At the same time, moisture is mixed into the fluorine atmosphere system, and HF generation and material corrosion due to HF can be prevented by reaction with F 2 gas.

（４）上記（３）において、好ましくは、前記第１のフッ化残渣回収容器に接続される第１のガス置換装置および第５の仕切り弁と、前記第２のフッ化残渣回収容器に接続される第２のガス置換装置および第６の仕切り弁とを備え、前記制御手段は、前記第１のフッ化残渣回収容器にフッ化残渣を移送後、前記第５の仕切り弁を開とし、前記第１のガス置換装置により、前記第１のフッ化残渣回収容器内のガスを不活性ガスに置換し、前記第２のフッ化残渣回収容器にフッ化残渣を移送後、前記第６の仕切り弁を開とし、前記第２のガス置換装置により、前記第２のフッ化残渣回収容器内のガスを不活性ガスに置換するようにしたものである。   (4) In the above (3), preferably, the first gas displacement device and the fifth gate valve connected to the first fluorination residue collection container and the second fluorination residue collection container are connected. A second gas replacement device and a sixth gate valve, wherein the control means opens the fifth gate valve after transferring the fluoride residue to the first fluoride residue recovery container, The first gas replacement device replaces the gas in the first fluoridation residue recovery container with an inert gas, transfers the fluoridation residue to the second fluoridation residue recovery container, The gate valve is opened, and the gas in the second fluoridation residue recovery container is replaced with an inert gas by the second gas replacement device.

本発明によれば、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できるものとなる。また、フッ化処理を中断することなくフッ化残渣を回収することができ、稼働率を向上させることができるものとなる。
According to the present invention, in recovering non-volatile U, Pu and FP fluoride radioactive powder from a fluorination process in a fluorine atmosphere, leakage of fluorine gas and radioactive materials to the outside of the fluorine atmosphere system is prevented. In addition, moisture is mixed into the fluorine atmosphere system, and reaction with F 2 gas can prevent HF generation and material corrosion due to HF. Further, the fluoridation residue can be recovered without interrupting the fluorination treatment, and the operating rate can be improved.

本発明の第１の実施形態によるフッ化物残渣回収装置の構成図である。It is a block diagram of the fluoride residue collection | recovery apparatus by the 1st Embodiment of this invention. 本発明の第２の実施形態によるフッ化物残渣回収装置の構成図である。It is a block diagram of the fluoride residue collection | recovery apparatus by the 2nd Embodiment of this invention. 本発明の第３の実施形態によるフッ化物残渣回収装置の構成図である。It is a block diagram of the fluoride residue collection | recovery apparatus by the 3rd Embodiment of this invention.

最初に、図１を用いて、本発明の第１の実施形態によるフッ化物残渣回収装置の構成及び動作について説明する。
図１は、本発明の第１の実施形態によるフッ化物残渣回収装置の構成図である。 First, the configuration and operation of the fluoride residue recovery apparatus according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a configuration diagram of a fluoride residue recovery apparatus according to a first embodiment of the present invention.

図１は、本実施形態によるフッ化物残渣回収装置で用いるＦＬＵＯＲＥＸ法の概略系統を示している。   FIG. 1 shows a schematic system of the FLUOREX method used in the fluoride residue recovery apparatus according to the present embodiment.

使用済核燃料粉体は、粉体供給ライン１を介してフレーム炉４に供給される。なお、使用済核燃料粉体のキャリアガスとしてＡｒガスをＡｒガス供給ライン２より供給する。使用済核燃料粉体をフッ化させるためのＦ２ガスは、Ｆ２ガス供給ライン３よりフレーム炉４に供給する。 The spent nuclear fuel powder is supplied to the flame furnace 4 through the powder supply line 1. Ar gas is supplied from the Ar gas supply line 2 as a carrier gas for the spent nuclear fuel powder. F 2 gas for fluorinating the spent nuclear fuel powder is supplied to the flame furnace 4 from the F 2 gas supply line 3.

フレーム炉４に使用済核燃料粉体とＦ２ガスを導入し、フッ化反応により粉体中の大部分のＵを気体状のＵＦ６に転換し揮発させ分離する。また、粉体中の一部のＦＰもフッ化反応により気体状のフッ化物に転換し揮発され分離される。揮発したＵＦ６等のガスは、ＵＦ６精製工程Ａ１にて精製され、次工程のＵＦ６回収系Ａ２に移送する。 Spent nuclear fuel powder and F 2 gas are introduced into the flame furnace 4, and most of the U in the powder is converted into gaseous UF 6 by the fluorination reaction, volatilized and separated. Further, a part of the FP in the powder is also converted into a gaseous fluoride by a fluorination reaction, volatilized and separated. Gas UF 6 such volatilized is purified by UF 6 purification steps A1, transferring the UF 6 recovery system A2 of the next step.

フレーム炉４のフッ化反応にてＵの大部分は揮発するが、不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物は、残渣としてフッ化残渣回収容器７Ａ，７Ｂに回収される。回収されたフッ化残渣は、酸化物転換工程Ｂ１へ移送される。フッ化残渣は、酸化物転換工程Ｂ１で水蒸気を反応させ酸化物に転換した後、溶媒抽出工程Ｂ２で硝酸に溶解し、溶媒抽出法の手法を用いて精製する。精製物は、ＭＯＸ回収工程Ｂ３で回収される。   Although most of U is volatilized by the fluorination reaction of the flame furnace 4, the non-volatile U, Pu and FP fluorides are recovered as fluoridation residue recovery containers 7A and 7B. The recovered fluoride residue is transferred to the oxide conversion step B1. The fluoride residue is converted into an oxide by reacting with water vapor in the oxide conversion step B1, and then dissolved in nitric acid in the solvent extraction step B2, and purified using a solvent extraction method. The purified product is recovered in MOX recovery step B3.

ここで、フレーム炉４で生成した不揮発性のフッ化物であるフッ化残渣は、フッ化残渣回収容器７Ａ，７Ｂで回収され、次工程である酸化物転換工程Ｂ１へ送る際には、水分を含む空気の混入、フッ素ガスの漏洩を防止する必要がある。これは、フレーム炉４ではフッ素を利用するため、水分を含む空気および水蒸気の混入により生成されたフッ化水素による腐食生成物による使用済核燃料のフッ化挙動への影響及び材料腐食への影響を小さくする必要がある。また、酸化物転換工程での酸化物転換反応で使用する水蒸気および反応で生成するＨＦガスの上流側のフッ化工程への逆流を防止する必要がある。フッ素ガスが空気中へ漏洩するとフッ化水素が生成するが、フッ化水素は生体に対して極めて浸透性が強いので、例え希薄でもフッ化水素の吸入やフッ化水素に接触することのないようにフッ素ガスの漏洩防止が必要とされている。また、放射線防護の観点から放射性粉体であるフッ化残渣の漏洩防止も必要である。したがって、フッ素雰囲気であるフレーム炉４から酸化物転換工程へのフッ化残渣の回収において、放射性物質及びフッ素雰囲気と系外との隔離を可能とするフッ化残渣回収装置が必要である。   Here, the fluoridation residue, which is a non-volatile fluoride generated in the flame furnace 4, is recovered in the fluoridation residue recovery containers 7A and 7B, and when it is sent to the oxide conversion step B1, which is the next step, moisture is supplied. It is necessary to prevent air inclusion and leakage of fluorine gas. This is because the flame furnace 4 uses fluorine, and therefore influences on the fluorination behavior of spent nuclear fuel and on the material corrosion due to the corrosion products of hydrogen fluoride generated by the mixing of air and water containing water. It needs to be small. In addition, it is necessary to prevent the backflow of the water vapor used in the oxide conversion reaction in the oxide conversion step and the HF gas generated in the reaction to the upstream fluorination step. When fluorine gas leaks into the air, hydrogen fluoride is generated, but hydrogen fluoride is extremely permeable to living organisms, so even if it is dilute, it should not be inhaled or contacted with hydrogen fluoride. In addition, it is necessary to prevent leakage of fluorine gas. In addition, from the viewpoint of radiation protection, it is also necessary to prevent leakage of fluoride residue, which is a radioactive powder. Therefore, in the recovery of the fluoridation residue from the flame furnace 4 which is a fluorine atmosphere to the oxide conversion step, a fluoridation residue recovery device which can separate the radioactive substance and the fluorine atmosphere from the outside of the system is required.

また、稼働率向上の観点から、フッ化処理を中断することなくフッ化残渣を回収することが必要である。   Moreover, it is necessary to collect | recover a fluoride residue, without interrupting a fluorination process from a viewpoint of an operation rate improvement.

従来の構成では、フッ化残渣回収容器は、一つのみ用いられていた。それに対して、本実施形態では、２つのフッ化残渣回収容器７Ａ，７Ｂを用いるとともに、それら、処理の流れ方向に直列に配置している。さらに、本実施形態では、フレーム炉４とフレーム炉で生成したフッ化残渣を回収するフッ化残渣回収容器７Ａとを隔離する仕切り弁８Ａと、フッ化残渣回収容器７Ａとフッ化残渣回収容器７Ｂとを隔離する仕切り弁８Ｂと、フッ化残渣回収容器７Ｂと酸化物転換工程とを隔離する仕切り弁８Ｃとを有し、仕切り弁８Ａ，８Ｂ，８Ｃを制御する制御装置１０を備えている。   In the conventional configuration, only one fluoride residue collection container is used. On the other hand, in this embodiment, while using two fluoride residue collection containers 7A and 7B, they are arranged in series in the process flow direction. Furthermore, in this embodiment, the gate valve 8A that isolates the flame furnace 4 and the fluoride residue collection container 7A that collects the fluoride residue generated in the flame furnace, the fluoride residue collection container 7A, and the fluoride residue collection container 7B And a control device 10 that controls the gate valves 8A, 8B, and 8C, and a gate valve 8C that isolates the fluoridation residue collection container 7B and the oxide conversion step.

フレーム炉４でのフッ化反応運転中、フレーム炉４で生成したフッ化残渣はフレーム炉４の底部に堆積する。制御装置１０は、堆積したフッ化残渣の量を検出して、それが所定量に達した時点で、仕切り弁８Ａを開とし、フレーム炉４で蓄積されたフッ化残渣をフッ化残渣回収ラインを通じてフッ化残渣回収容器７Ａに移送させる。残渣移送後、制御装置１０は、仕切り弁８Ａを閉とし、フレーム炉４とフッ化残渣回収容器７Ａを隔離した後、仕切り弁８Ｂを開とし、フッ化残渣回収容器７Ａ内のフッ化残渣をフッ化残渣回収容器７Ｂへ移送させる。残渣移送後、制御装置１０は、仕切り弁８Ｂを閉とし、フッ化残渣回収容器７Ａとフッ化残渣回収容器７Ｂを隔離した後、仕切り弁８Ｃを開とし、フッ化残渣回収容器７Ｂ内のフッ化残渣を酸化物転換工程へ移送させる。残渣移送後、制御装置１０は、仕切り弁８Ｃを閉とする。フッ化残渣の移送は、例えば、ロータリーフィーダー、スクリューフィーダーなどを用いて行う。   During the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 is deposited on the bottom of the flame furnace 4. The control device 10 detects the amount of accumulated fluoride residue, and when it reaches a predetermined amount, the control valve 10A is opened, and the fluoride residue accumulated in the flame furnace 4 is removed from the fluoride residue collection line. Through to the fluoridation residue collection container 7A. After the residue transfer, the control device 10 closes the gate valve 8A, isolates the flame furnace 4 and the fluoride residue recovery container 7A, then opens the gate valve 8B, and removes the fluoride residue in the fluoride residue recovery container 7A. It is made to transfer to the fluoride residue collection container 7B. After the residue transfer, the control device 10 closes the partition valve 8B, isolates the fluoride residue collection container 7A and the fluoride residue collection container 7B, then opens the partition valve 8C, and closes the fluoride residue collection container 7B. The chemical residue is transferred to the oxide conversion process. After the residue transfer, the control device 10 closes the gate valve 8C. The transfer of the fluoride residue is performed using, for example, a rotary feeder, a screw feeder or the like.

本実施形態によれば、フッ化残渣移送経路を開放せずに、フレーム炉４から酸化物転換工程へ移送することができ、系外からの水分を含む空気の系内への混入および系内から系外へのフッ素ガスの漏洩を防止することができる。また、放射性物質の系外への漏洩を防止することができる。   According to the present embodiment, it is possible to transfer from the flame furnace 4 to the oxide conversion step without opening the fluoridation residue transfer path, and mixing of the air containing moisture from outside the system into the system and the inside of the system Leakage of fluorine gas from the system to the outside of the system can be prevented. In addition, leakage of radioactive substances outside the system can be prevented.

フッ化残渣のフレーム炉４から酸化物転換工程への移送処理中、常に仕切り弁８Ａ，８Ｂ，８Ｃのいずれかが、閉となっているため、酸化物転換工程からの水蒸気の逆流を防止することができる。   During the transfer process of the fluoridation residue from the flame furnace 4 to the oxide conversion process, any one of the gate valves 8A, 8B, 8C is always closed, thereby preventing the backflow of water vapor from the oxide conversion process. be able to.

フレーム炉４でのフッ化反応運転を停止させることなく、フレーム炉４で生成したフッ化残渣を酸化物転換工程へ移送させることが可能となる。   Without stopping the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 can be transferred to the oxide conversion step.

また、後述の実施形態に比べて、構成をシンプルとすることができる。   In addition, the configuration can be simplified compared to the embodiments described later.

以上により、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できる。 As described above, in recovering the radioactive powder of non-volatile U, Pu and FP fluorides from the fluorination process in a fluorine atmosphere, leakage of fluorine gas and radioactive substances to the outside of the fluorine atmosphere system due to the above characteristics. In addition, moisture can be mixed into the fluorine atmosphere system, and HF generation and material corrosion due to HF can be prevented by reaction with F 2 gas.

また、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ化処理を中断することなく放射性粉体を回収することができ、稼働率を向上させることができる。   Moreover, when recovering the radioactive powder of non-volatile U, Pu and FP fluoride from the fluorination process which is a fluorine atmosphere, the radioactive powder is recovered without interrupting the fluorination treatment by having the above characteristics. And the operating rate can be improved.

次に、図２を用いて、本発明の第２の実施形態によるフッ化物残渣回収装置の構成及び動作について説明する。
図２は、本発明の第２の実施形態によるフッ化物残渣回収装置の構成図である。なお、図１と同一符号は、同一部分を示している。 Next, the configuration and operation of the fluoride residue recovery apparatus according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 2 is a configuration diagram of a fluoride residue recovery apparatus according to the second embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

本実施形態においても、ＦＬＵＯＲＥＸ法の概略系統は、図１に示したものと同様である。   Also in this embodiment, the schematic system of the FLUOREX method is the same as that shown in FIG.

本実施形態では、２つのフッ化残渣回収容器７Ａ，７Ｂを用いるとともに、それら、処理の流れ方向に並列に配置している。さらに、本実施形態では、フレーム炉４とフレーム炉で生成したフッ化残渣を回収するフッ化残渣回収容器７Ａと同じくフッ化残渣を回収するフッ化残渣回収容器７Ｂへのフッ化残渣の移送を切り替える切換え弁９と、フレーム炉４とフッ化残渣回収容器７Ａとを隔離する仕切り弁８Ａと、フレーム炉４とフッ化残渣回収容器７Ｂとを隔離する仕切り弁８Ｃと、フッ化残渣回収容器７Ａと酸化物転換工程とを隔離する仕切り弁８Ｂと、フッ化残渣回収容器７Ｂと酸化物転換工程とを隔離する仕切り弁８Ｄと、切換え弁９、仕切り弁８Ａ、８Ｂ、８Ｃ、８Ｄを制御する制御装置１０Ａとを備えている。   In the present embodiment, two fluoride residue collection containers 7A and 7B are used and arranged in parallel in the process flow direction. Further, in this embodiment, the fluorination residue is transferred to the fluoridation residue collection container 7B that collects the fluoridation residue in the same manner as the fluorination residue collection container 7A that collects the fluoridation residue generated in the flame furnace 4 and the frame furnace. A switching valve 9 for switching, a gate valve 8A for isolating the flame furnace 4 and the fluoride residue recovery container 7A, a gate valve 8C for isolating the flame furnace 4 and the fluoride residue recovery container 7B, and a fluoride residue recovery container 7A Controls the gate valve 8B that isolates the oxide conversion step, the gate valve 8D that isolates the fluoride residue recovery container 7B and the oxide conversion step, and the switching valve 9 and the gate valves 8A, 8B, 8C, and 8D. And a control device 10A.

フレーム炉４でのフッ化反応運転中、フレーム炉４で生成したフッ化残渣はフレーム炉４の底部に堆積する。制御装置１０Ａは、堆積したフッ化残渣の量を検出して、それが所定量に達した時点で、切換え弁９を残渣回収容器７Ａへの移送側に切換え、かつ仕切り弁８Ａを開とし、フレーム炉４で蓄積されたフッ化残渣をフッ化残渣回収ライン６Ａを通じてフッ化残渣回収容器７Ａに移送させる。残渣移送後、制御装置１０Ａは、切換え弁９、仕切り弁８Ａを閉とし、フレーム炉４とフッ化残渣回収容器７Ａを隔離する。次に、制御装置１０Ａは、仕切り弁８Ｂを開とし、フッ化残渣回収容器７Ａ内のフッ化残渣を酸化物転換工程へ移送させる。残渣移送後、制御装置１０Ａは、仕切り弁８Ｂを閉とする。フッ化残渣回収容器７Ａから酸化物転換工程へのフッ化残渣移送処置中、制御装置１０Ａは、切換え弁９を残渣回収容器７Ｂへの移送側に切換え、かつ仕切り弁８Ｃを開とし、フレーム炉４で蓄積されたフッ化残渣をフッ化残渣回収ライン６Ｃを通じてフッ化残渣回収容器７Ｂに移送させる。残渣移送後、制御装置１０Ａは、切換え弁９、仕切り弁８Ｃを閉とし、フレーム炉４とフッ化残渣回収容器７Ｂを隔離する。次に、制御装置１０Ａは、仕切り弁８Ｄを開とし、フッ化残渣回収容器７Ａ内のフッ化残渣を酸化物転換工程へ移送させる。残渣移送後、制御装置１０Ａは、仕切り弁８Ｄを閉とする。フッ化残渣回収容器７Ａを通じてフッ化残渣を酸化物転換工程へ移送する運転と、フッ化残渣回収容器７Ｂを通じてフッ化残渣を酸化物転換工程へ移送する運転とを交互に運転する。フッ化残渣の移送は、例えば、ロータリーフィーダー、スクリューフィーダーなどを用いて行う。   During the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 is deposited on the bottom of the flame furnace 4. The control device 10A detects the amount of the accumulated fluoride residue, and when it reaches a predetermined amount, switches the switching valve 9 to the transfer side to the residue collection container 7A and opens the gate valve 8A. The fluoridation residue accumulated in the flame furnace 4 is transferred to the fluoridation residue collection container 7A through the fluorination residue collection line 6A. After the residue transfer, the control device 10A closes the switching valve 9 and the gate valve 8A, and isolates the frame furnace 4 and the fluoride residue collection container 7A. Next, the control device 10A opens the gate valve 8B, and transfers the fluoride residue in the fluoride residue collection container 7A to the oxide conversion step. After the residue transfer, the control device 10A closes the gate valve 8B. During the fluoridation residue transfer treatment from the fluoridation residue collection container 7A to the oxide conversion step, the control device 10A switches the switching valve 9 to the transfer side to the residue collection container 7B, opens the gate valve 8C, and The fluoridation residue accumulated in 4 is transferred to the fluorination residue collection container 7B through the fluorination residue collection line 6C. After the residue transfer, the control device 10A closes the switching valve 9 and the gate valve 8C, and isolates the frame furnace 4 and the fluoride residue collection container 7B. Next, the control device 10A opens the gate valve 8D, and transfers the fluoride residue in the fluoride residue recovery container 7A to the oxide conversion step. After the residue transfer, the control device 10A closes the gate valve 8D. The operation of transferring the fluorination residue to the oxide conversion step through the fluorination residue recovery container 7A and the operation of transferring the fluorination residue to the oxide conversion step through the fluorination residue recovery vessel 7B are alternately operated. The transfer of the fluoride residue is performed using, for example, a rotary feeder, a screw feeder or the like.

なお、以上の例では、２系統を並列としているが、３系統以上を並列とした構成も可能である。   In the above example, two systems are arranged in parallel, but a configuration in which three systems or more are arranged in parallel is also possible.

本実施形態によれば、フッ化残渣移送経路を開放せずに、フレーム炉４から酸化物転換工程へ移送することができ、系外からの水分を含む空気の系内への混入および系内から系外へのフッ素ガスの漏洩を防止することができる。また、放射性物質の系外への漏洩を防止することができる。   According to the present embodiment, it is possible to transfer from the flame furnace 4 to the oxide conversion step without opening the fluoridation residue transfer path, and mixing of the air containing moisture from outside the system into the system and the inside of the system Leakage of fluorine gas from the system to the outside of the system can be prevented. In addition, leakage of radioactive substances outside the system can be prevented.

フッ化残渣のフレーム炉４から酸化物転換工程への移送処理中、常に仕切り弁８Ａ、８Ｂ、８Ｃのいずれかが、閉となっているため、酸化物転換工程からの水蒸気の逆流を防止することができる。   During the transfer process of the fluoridation residue from the flame furnace 4 to the oxide conversion process, any one of the gate valves 8A, 8B, 8C is always closed, thereby preventing the backflow of water vapor from the oxide conversion process. be able to.

フレーム炉４でのフッ化反応運転を停止させることなく、フレーム炉４で生成したフッ化残渣を酸化物転換工程へ移送させることが可能となる。   Without stopping the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 can be transferred to the oxide conversion step.

また、図１に示した例と比較し、多数のフッ化残渣回収容器を接続する際に優位となる。   Moreover, it is advantageous when connecting a large number of fluorination residue collection containers as compared to the example shown in FIG.

以上により、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できる。 As described above, in recovering the radioactive powder of non-volatile U, Pu and FP fluorides from the fluorination process in a fluorine atmosphere, leakage of fluorine gas and radioactive substances to the outside of the fluorine atmosphere system due to the above characteristics. In addition, moisture can be mixed into the fluorine atmosphere system, and HF generation and material corrosion due to HF can be prevented by reaction with F 2 gas.

また、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ化処理を中断することなく放射性粉体を回収することができ、稼働率を向上させることができる。   Moreover, when recovering the radioactive powder of non-volatile U, Pu and FP fluoride from the fluorination process which is a fluorine atmosphere, the radioactive powder is recovered without interrupting the fluorination treatment by having the above characteristics. And the operating rate can be improved.

なお、フッ化残渣回収容器の形状を回収された放射性物質による臨界とならない形状，容量とすることにより、臨界事故を防止する。ここでは、複数個のフッ化残渣回収容器を接続することができるため、任意の臨界管理上の容量、形状とすることができる。   In addition, criticality accidents are prevented by making the shape of the fluoridation residue collection container into a shape and capacity that does not become critical due to the collected radioactive material. Here, since a plurality of fluorination residue collection containers can be connected, the capacity and shape can be arbitrarily controlled.

次に、図３を用いて、本発明の第３の実施形態によるフッ化物残渣回収装置の構成及び動作について説明する。
図３は、本発明の第３の実施形態によるフッ化物残渣回収装置の構成図である。なお、図１と同一符号は、同一部分を示している。 Next, the configuration and operation of the fluoride residue recovery apparatus according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a configuration diagram of a fluoride residue recovery apparatus according to the third embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

本実施形態においても、ＦＬＵＯＲＥＸ法の概略系統は、図１に示したものと同様である。   Also in this embodiment, the schematic system of the FLUOREX method is the same as that shown in FIG.

本実施形態では、２つのフッ化残渣回収容器７Ａ，７Ｂを用いるとともに、それら、処理の流れ方向に直列に配置している。さらに、本実施形態では、フレーム炉４とフレーム炉で生成したフッ化残渣を回収するフッ化残渣回収容器７Ａとを隔離する仕切り弁８Ａと、フッ化残渣回収容器７Ａとフッ化残渣回収容器７Ｂとを隔離する仕切り弁８Ｂと、フッ化残渣回収容器７Ｂと酸化物転換工程とを隔離する仕切り弁８Ｃと、さらにはフッ化残渣回収容器７Ａに接続されるガス置換装置１１Ａおよび仕切り弁８Ｆと、フッ化残渣回収容器７Ｂに接続されるガス置換装置１１Ｂおよび仕切り弁８Ｇと、仕切り弁８Ａ，８Ｂ，８Ｃ，８Ｆ，８Ｇを制御する制御装置１０Ｂとを備えている。   In this embodiment, while using two fluoride residue collection containers 7A and 7B, they are arranged in series in the process flow direction. Furthermore, in this embodiment, the gate valve 8A that isolates the flame furnace 4 and the fluoride residue collection container 7A that collects the fluoride residue generated in the flame furnace, the fluoride residue collection container 7A, and the fluoride residue collection container 7B A gate valve 8B for isolating the fluoride residue recovery container 7B and the oxide conversion step, and a gas replacement device 11A and a gate valve 8F connected to the fluoride residue recovery container 7A The gas replacement device 11B and the gate valve 8G connected to the fluoride residue recovery container 7B, and the control device 10B for controlling the gate valves 8A, 8B, 8C, 8F, and 8G are provided.

フレーム炉４でのフッ化反応運転中、フレーム炉４で生成したフッ化残渣はフレーム炉４底部に堆積する。制御装置１０Ｂは、堆積したフッ化残渣の量を検出して、それが所定量に達した時点で、仕切り弁８Ａを開とし、フレーム炉４で蓄積されたフッ化残渣をフッ化残渣回収ライン６を通じてフッ化残渣回収容器７Ａに移送させる。残渣移送後、制御装置１０Ｂは、仕切り弁８Ａを閉とし、フレーム炉４とフッ化残渣回収容器７Ａを隔離した後、仕切り弁８Ｆを開とし、ガス置換装置１１Ａにより、フッ化残渣回収容器７Ａ内のガスを不活性ガスに置換し、仕切り弁８Ｆを閉とする。次に、制御装置１０Ｂは、仕切り弁８Ｇを開とし、ガス置換装置１１Ｂにより、フッ化残渣回収容器７Ｂ内のガスを不活性ガスに置換し、仕切り弁８Ｇを閉とする。次に制御装置１０Ｂは、仕切り弁８Ｂを開とし、フッ化残渣回収容器７Ａ内のフッ化残渣をフッ化残渣回収容器７Ｂへ移送させる。残渣移送後、制御装置１０Ｂは、仕切り弁８Ｂを閉とし、フッ化残渣回収容器７Ａとフッ化残渣回収容器７Ｂを隔離した後、仕切り弁８Ｃを開とし、フッ化残渣回収容器７Ｂ内のフッ化残渣を酸化物転換工程へ移送させる。残渣移送後、制御装置１０Ｂは、仕切り弁８Ｃを閉とする。フッ化残渣の移送は、例えば、ロータリーフィーダー、スクリューフィーダーなどを用いて行う。   During the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 is deposited on the bottom of the flame furnace 4. The control device 10B detects the amount of the accumulated fluoride residue, and when it reaches a predetermined amount, the control valve 10B opens the gate valve 8A, and the fluoride residue accumulated in the flame furnace 4 is recovered to the fluoride residue recovery line. 6 is transferred to the fluoride residue collection container 7A. After the residue transfer, the control device 10B closes the gate valve 8A, isolates the flame furnace 4 and the fluoride residue recovery container 7A, then opens the gate valve 8F, and the gas replacement device 11A causes the fluoride residue recovery container 7A to open. The gas inside is replaced with an inert gas, and the gate valve 8F is closed. Next, the control device 10B opens the gate valve 8G, uses the gas replacement device 11B to replace the gas in the fluoridation residue collection container 7B with an inert gas, and closes the gate valve 8G. Next, the control device 10B opens the gate valve 8B and transfers the fluoride residue in the fluoride residue collection container 7A to the fluoride residue collection container 7B. After the residue transfer, the control device 10B closes the gate valve 8B, isolates the fluoride residue recovery container 7A and the fluoride residue recovery container 7B, then opens the gate valve 8C, and closes the fluoride residue recovery container 7B. The chemical residue is transferred to the oxide conversion process. After the residue transfer, the control device 10B closes the gate valve 8C. The transfer of the fluoride residue is performed using, for example, a rotary feeder, a screw feeder or the like.

本実施形態によれば、フッ化残渣移送経路を開放せずに、フレーム炉４から酸化物転換工程へ移送することができ、系外からの水分を含む空気の系内への混入および系内から系外へのフッ素ガスの漏洩を防止することができる。また、放射性物質の系外への漏洩を防止することができる。   According to the present embodiment, it is possible to transfer from the flame furnace 4 to the oxide conversion step without opening the fluoridation residue transfer path, and mixing of the air containing moisture from outside the system into the system and the inside of the system Leakage of fluorine gas from the system to the outside of the system can be prevented. In addition, leakage of radioactive substances outside the system can be prevented.

フッ化残渣のフレーム炉４から酸化物転換工程への移送処理中、常に仕切り弁８Ａ，８Ｂ，８Ｃのいずれかが、閉となっているため、酸化物転換工程からの水蒸気の逆流を防止することができる。   During the transfer process of the fluoridation residue from the flame furnace 4 to the oxide conversion process, any one of the gate valves 8A, 8B, 8C is always closed, thereby preventing the backflow of water vapor from the oxide conversion process. be able to.

さらには、フッ化残渣回収容器に含まれるフッ素ガス、水蒸気を除去することができ、フッ化工程から酸化物転換工程へのフッ素ガスの混入および酸化物転換工程から上流側への水蒸気の逆流をより低減することが可能となる。   Furthermore, fluorine gas and water vapor contained in the fluoridation residue recovery container can be removed, and fluorine gas mixing from the fluorination step to the oxide conversion step and backflow of water vapor from the oxide conversion step to the upstream side can be prevented. This can be further reduced.

フレーム炉４でのフッ化反応運転を停止させることなく、フレーム炉４で生成したフッ化残渣を酸化物転換工程へ移送させることが可能となる。   Without stopping the fluorination reaction operation in the flame furnace 4, the fluoridation residue generated in the flame furnace 4 can be transferred to the oxide conversion step.

以上により、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ素雰囲気系外へのフッ素ガス、放射性物質の漏えいを防止することができるとともに、フッ素雰囲気系内へ湿分が混入しＦ２ガスとの反応によりＨＦ生成及びＨＦによる材料腐食を防止できる。 As described above, in recovering the radioactive powder of non-volatile U, Pu and FP fluorides from the fluorination process in a fluorine atmosphere, leakage of fluorine gas and radioactive substances to the outside of the fluorine atmosphere system due to the above characteristics. In addition, moisture can be mixed into the fluorine atmosphere system, and HF generation and material corrosion due to HF can be prevented by reaction with F 2 gas.

また、フッ素雰囲気であるフッ化工程から不揮発性Ｕ、Ｐｕ及びＦＰのフッ化物の放射性粉体を回収するに当たり、上記特徴を有することにより、フッ化処理を中断することなく放射性粉体を回収することができ、稼働率を向上させることができる。   Moreover, when recovering the radioactive powder of non-volatile U, Pu and FP fluoride from the fluorination process which is a fluorine atmosphere, the radioactive powder is recovered without interrupting the fluorination treatment by having the above characteristics. And the operating rate can be improved.

なお、フッ化残渣回収容器の形状を回収された放射性物質による臨界とならない形状，容量とすることにより、臨界事故を防止する。ここでは、複数個のフッ化残渣回収容器を接続することができるため、任意の臨界管理上の容量、形状とすることができる。
In addition, criticality accidents are prevented by making the shape of the fluoridation residue collection container into a shape and capacity that does not become critical due to the collected radioactive material. Here, since a plurality of fluorination residue collection containers can be connected, the capacity and shape can be arbitrarily controlled.

１…粉体供給ライン
２…Ａｒガス供給ライン
３…Ｆ２ガス供給ライン
４…フレーム炉
５…ＵＦ６ガス精製ライン
６，６Ａ，６Ｂ…フッ化残渣回収ライン
７Ａ，７Ｂ…フッ化残渣回収容器
８Ａ，８Ｂ，８Ｃ，８Ｄ，８Ｆ，８Ｇ…仕切り弁
９…切換え弁
１１Ａ，１１Ｂ…ガス置換装置 DESCRIPTION OF SYMBOLS 1 ... Powder supply line 2 ... Ar gas supply line 3 ... F 2 gas supply line 4 ... Flame furnace 5 ... UF 6 Gas purification line 6, 6A, 6B ... Fluoride residue collection line 7A, 7B ... Fluoride residue collection container 8A, 8B, 8C, 8D, 8F, 8G ... Gate valve 9 ... Switching valve 11A, 11B ... Gas replacement device

Claims (4)

フレーム炉におけるフッ化工程で生じた固体フッ化物粉末をフッ化残渣回収容器により回収するフッ化残渣回収装置であって、
前記フッ化残渣回収容器は、前記フレーム炉の下流側に直列に接続された第１及び第２のフッ化残渣回収容器からなり、
前記フレーム炉と前記第１のフッ化残渣回収容器との間を仕切る第１の仕切り弁と、
前記第１のフッ化残渣回収容器と前記第２のフッ化残渣回収容器との間を仕切る第２の仕切り弁と、
前記第２のフッ化残渣回収容器の下流側に設けられた第３の仕切り弁と、
前記第１から第３の仕切り弁の開閉を制御する制御手段を備え、
前記制御手段は、前記フレーム炉の底部に堆積したフッ化残渣が所定量になると、前記第１の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第１のフッ化残渣回収容器に移送させ、残渣移送後、前記第１の仕切り弁を閉とし、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を前記第２のフッ化残渣回収容器に移送させ、残渣移送後、前記第２の仕切り弁を閉とし、前記第３の仕切り弁を開とし、前記第２のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させることを特徴とするフッ化残渣回収装置。 A fluoridation residue collection device for collecting solid fluoride powder generated in a fluorination step in a flame furnace with a fluoridation residue collection container,
The fluoridation residue collection container comprises first and second fluoridation residue collection containers connected in series downstream of the frame furnace,
A first gate valve for partitioning between the frame furnace and the first fluorination residue collection container;
A second gate valve for partitioning between the first fluoridation residue collection container and the second fluorination residue collection container;
A third gate valve provided downstream of the second fluorination residue collection container;
Control means for controlling opening and closing of the first to third gate valves;
The control means opens the first gate valve when a predetermined amount of fluoridation residue deposited on the bottom of the flame furnace is reached, and removes the fluoridation residue accumulated in the flame furnace as the first fluoride residue. After the transfer to the recovery container and the residue transfer, the first gate valve is closed, the second gate valve is opened, and the fluoride residue in the first fluoride residue recovery container is removed from the second fluoride valve. After the residue is transferred, the second gate valve is closed, the third gate valve is opened, and the fluoride residue in the second fluoride residue recovery container is converted to oxide. A fluoridation residue recovery apparatus, wherein the apparatus is transported to a process. 請求項１に記載のフッ化残渣回収装置において、さらに、
前記第１のフッ化残渣回収容器に接続される第１のガス置換装置および第４の仕切り弁と、
前記第２のフッ化残渣回収容器に接続される第２のガス置換装置および第５の仕切り弁とを備え、
前記制御手段は、前記第１のフッ化残渣回収容器にフッ化残渣を移送後、前記第４の仕切り弁を開とし、前記第１のガス置換装置により、前記第１のフッ化残渣回収容器内のガスを不活性ガスに置換し、
前記第５の仕切り弁を開とし、前記第２のガス置換装置により、前記第２のフッ化残渣回収容器内のガスを不活性ガスに置換した後、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を前記第２のフッ化残渣回収容器に移送させることを特徴とするフッ化残渣回収装置。 The fluoride residue recovery apparatus according to claim 1, further comprising:
A first gas displacement device and a fourth gate valve connected to the first fluorination residue collection container;
A second gas displacement device and a fifth gate valve connected to the second fluorination residue recovery container,
The control means opens the fourth gate valve after transferring the fluoridation residue to the first fluoridation residue recovery container, and the first gas replacement device causes the first fluoridation residue recovery container to open. Replace the gas inside with inert gas,
The fifth gate valve is opened, and the second gas replacement device replaces the gas in the second fluoridation residue collection container with an inert gas, and then opens the second gate valve, A fluoridation residue recovery apparatus, wherein the fluorination residue in the first fluoridation residue recovery container is transferred to the second fluorination residue recovery container. フレーム炉におけるフッ化工程で生じた固体フッ化物粉末をフッ化残渣回収容器により回収するフッ化残渣回収装置であって、
前記フッ化残渣回収容器は、前記フレーム炉の下流側に並列に接続された第１及び第２のフッ化残渣回収容器からなり、
前記フレーム炉と前記第１のフッ化残渣回収容器との間を仕切る第１の仕切り弁と、
前記第１のフッ化残渣回収容器の下流側に設けられた第２の仕切り弁と、
前記フレーム炉と前記第２のフッ化残渣回収容器との間を仕切る第３の仕切り弁と、
前記第２のフッ化残渣回収容器の下流側に設けられた第４の仕切り弁と、
前記第１から第４の仕切り弁の開閉を制御する制御手段を備え、
前記制御手段は、前記フレーム炉の底部に堆積したフッ化残渣が所定量になると、前記第１の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第１のフッ化残渣回収容器に移送させ、残渣移送後、前記第１の仕切り弁を閉とし、前記第２の仕切り弁を開とし、前記第１のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させ、前記第３の仕切り弁を開とし、前記フレーム炉で蓄積されたフッ化残渣を前記第２のフッ化残渣回収容器に移送させ、残渣移送後、前記第３の仕切り弁を閉とし、前記第４の仕切り弁を開とし、前記第２のフッ化残渣回収容器内のフッ化残渣を酸化物転換工程へ移送させることを特徴とするフッ化残渣回収装置。 A fluoridation residue collection device for collecting solid fluoride powder generated in a fluorination step in a flame furnace with a fluoridation residue collection container,
The fluoridation residue collection container comprises first and second fluoridation residue collection containers connected in parallel to the downstream side of the frame furnace,
A first gate valve for partitioning between the frame furnace and the first fluorination residue collection container;
A second gate valve provided downstream of the first fluorination residue collection container;
A third gate valve for partitioning between the frame furnace and the second fluoridation residue collection container;
A fourth gate valve provided on the downstream side of the second fluorination residue collection container;
Control means for controlling opening and closing of the first to fourth gate valves;
The control means opens the first gate valve when a predetermined amount of fluoridation residue deposited on the bottom of the flame furnace is reached, and removes the fluoridation residue accumulated in the flame furnace as the first fluoride residue. After the transfer to the recovery container and the residue transfer, the first gate valve is closed, the second gate valve is opened, and the fluoride residue in the first fluoride residue recovery container is transferred to the oxide conversion step. The third partition valve is opened, the fluoridation residue accumulated in the flame furnace is transferred to the second fluoridation residue collection container, and after the residue is transferred, the third partition valve is closed. The fluoridation residue recovery apparatus characterized in that the fourth gate valve is opened and the fluoridation residue in the second fluoridation residue recovery container is transferred to the oxide conversion step. 請求項３に記載のフッ化残渣回収装置において、さらに、
前記第１のフッ化残渣回収容器に接続される第１のガス置換装置および第５の仕切り弁と、
前記第２のフッ化残渣回収容器に接続される第２のガス置換装置および第６の仕切り弁とを備え、
前記制御手段は、前記第１のフッ化残渣回収容器にフッ化残渣を移送後、前記第５の仕切り弁を開とし、前記第１のガス置換装置により、前記第１のフッ化残渣回収容器内のガスを不活性ガスに置換し、
前記第２のフッ化残渣回収容器にフッ化残渣を移送後、前記第６の仕切り弁を開とし、前記第２のガス置換装置により、前記第２のフッ化残渣回収容器内のガスを不活性ガスに置換することを特徴とするフッ化残渣回収装置。 In the fluoridation residue collection | recovery apparatus of Claim 3, Furthermore,
A first gas displacement device and a fifth gate valve connected to the first fluorination residue collection container;
A second gas displacement device and a sixth gate valve connected to the second fluorination residue recovery container,
The control means opens the fifth gate valve after transferring the fluoridation residue to the first fluorination residue collection container, and the first gas replacement device causes the first fluoridation residue collection container to open. Replace the gas inside with inert gas,
After the fluoridation residue is transferred to the second fluoridation residue recovery container, the sixth gate valve is opened, and the gas in the second fluoridation residue recovery container is made undisturbed by the second gas replacement device. An apparatus for recovering fluoridation residue, wherein the apparatus is replaced with active gas.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012047546A (en) * 2010-08-26 2012-03-08 Hitachi-Ge Nuclear Energy Ltd Fluorination device, fluorination method and reprocessing method for nuclear fuel material

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