JP6734574B2 - Rotating equipment for nuclear facilities - Google Patents

Rotating equipment for nuclear facilities Download PDF

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JP6734574B2
JP6734574B2 JP2019061568A JP2019061568A JP6734574B2 JP 6734574 B2 JP6734574 B2 JP 6734574B2 JP 2019061568 A JP2019061568 A JP 2019061568A JP 2019061568 A JP2019061568 A JP 2019061568A JP 6734574 B2 JP6734574 B2 JP 6734574B2
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radionuclide
rotating mechanism
rotating
nuclear
blade
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JP2019124702A (en
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章仁 大谷
章仁 大谷
聰 高橋
聰 高橋
ヤン ジングロン
ヤン ジングロン
佐藤　博之
博之 佐藤
良行 今井
良行 今井
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IHI Corp
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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
    • 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

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Description

本発明は、原子力施設における放射性核種を内包する冷却流体の循環路内に配置される原子力施設の回転機器に関するものである。 TECHNICAL FIELD The present invention relates to a rotating device of a nuclear facility, which is arranged in a circulation path of a cooling fluid containing a radionuclide in the nuclear facility.

従来、上記した原子力施設としては、例えば、特許文献１に記載された原子力プラントがある。
この原子力プラントは、高温ガス炉と熱交換器との間で放射性核種を内包する冷却流体としての一次冷却ヘリウムを循環させる一次冷却回路と、熱交換器と発電設備との間で発電作動流体としての二次冷却ヘリウムを循環させる二次冷却回路を備えている。 Conventionally, as the above-mentioned nuclear facility, for example, there is a nuclear plant described in Patent Document 1.
This nuclear power plant is a primary cooling circuit that circulates primary cooling helium as a cooling fluid containing a radionuclide between a high temperature gas reactor and a heat exchanger, and as a power generation working fluid between a heat exchanger and a power generation facility. The secondary cooling circuit for circulating the secondary cooling helium is provided.

この原子力プラントでは、一次冷却回路を循環する一次冷却ヘリウムによって、高温ガス炉で生じる熱を熱交換器に運び、この熱交換器において、二次冷却回路を循環する二次冷却ヘリウムに一次冷却ヘリウムの熱を移動させ、この二次冷却ヘリウムに移動した熱を発電設備に送って発電に供するようになっている。 In this nuclear power plant, the primary cooling helium circulating in the primary cooling circuit carries the heat generated in the high temperature gas reactor to the heat exchanger, and in this heat exchanger, the primary cooling helium is circulated in the secondary cooling helium circulating in the secondary cooling circuit. The heat transferred to the secondary cooling helium is sent to the power generation equipment for power generation.

このような原子力プラントにおいて、通常一次冷却回路にサーキュレータ（回転機器）を配置して、一次冷却ヘリウムを加速して循環させるようになっている。 In such a nuclear power plant, a circulator (rotating device) is usually arranged in the primary cooling circuit to accelerate and circulate the primary cooling helium.

特開平10-319169号公報JP 10-319169 A

上記した原子力プラントのサーキュレータにおいて、放射性核種を内包する一次冷却ヘリウムと接触する回転翼や翼軸には多結晶合金（通常結晶粒径材）が用いられているので、高温ガス炉と熱交換器との間で一次冷却ヘリウムを循環させるべく運転を重ねるうちに、一次冷却ヘリウムに内包される放射性核種、例えば、銀が回転翼や翼軸を構成する多結晶合金の深部に拡散浸透してしまう。 In the circulator of the nuclear power plant described above, a polycrystalline alloy (usually a grain size material) is used for the rotor blade and blade shaft that come into contact with the primary cooling helium containing the radionuclide, so that the high temperature gas reactor and the heat exchanger are used. During repeated operation to circulate the primary cooling helium between and, the radioactive nuclide contained in the primary cooling helium, for example, silver diffuses and permeates into the deep part of the polycrystalline alloy forming the rotor blade and blade axis. ..

つまり、従来の原子力プラントにおけるサーキュレータでは、多結晶合金の深部に拡散浸透した銀からのガンマ線等による作業員被曝を防ぐために、補修点検時おいて作業時間の制限を設けたり遠隔装置を使用したりしなければならず、その結果、メンテナンスコストが高いものとなってしまうという問題があり、この問題を解決することが従来の課題となっていた。 In other words, in circulators in conventional nuclear power plants, in order to prevent worker exposure to gamma rays, etc. from silver that diffused and penetrated into the deep part of polycrystalline alloys, limit the working time at the time of repair inspection or use remote equipment. Therefore, there is a problem that the maintenance cost becomes high as a result, and it has been a conventional problem to solve this problem.

本発明は、上記した従来の課題に着目してなされたもので、放射性核種を内包する冷却流体と接触する回転翼や翼軸を構成する材料の深部に放射性核種が拡散浸透するのを防ぐことができ、その結果、メンテナンスコストの低減を実現することが可能である原子力施設の回転機器を提供することを目的としている。 The present invention has been made by paying attention to the above-mentioned conventional problems, and prevents the radioactive nuclide from diffusing and penetrating into the deep part of the material forming the rotor blade or the blade shaft that comes into contact with the cooling fluid containing the radioactive nuclide. Therefore, it is an object of the present invention to provide a rotating device for a nuclear facility that can reduce maintenance costs.

ここで、図５に示すように、材料に対する放射性核種の拡散とは、熱によって材料の原子と放射性核種の原子、例えば銀（Ａｇ）の原子とが場所を入れ替わる現象であり、材料の表面Ｓから結晶粒Ｃの境目である結晶粒界Ｃａへの拡散速度は、結晶粒Ｃの中央に比べて早いことが知られている。 Here, as shown in FIG. 5, the diffusion of a radionuclide into a material is a phenomenon in which an atom of the material and an atom of the radionuclide, for example, an atom of silver (Ag) are exchanged with each other by heat, and the surface S of the material. It is known that the diffusion rate from the crystal grain C to the crystal grain boundary Ca, which is the boundary of the crystal grain C, is faster than that in the center of the crystal grain C.

本発明者らは、この現象を踏まえて、結晶粒の粒径を大きくしたり単結晶化したりして単位体積中の結晶粒（結晶粒界）の数を減らす、すなわち、拡散速度の大きい粒界の面積を減少させることで、拡散により増加する単位体積当たりのＡｇ含有量を減らし得ることを見出した。 Based on this phenomenon, the present inventors reduce the number of crystal grains (grain boundaries) in a unit volume by increasing the grain size of the crystal grains or converting them into single crystals, that is, grains having a high diffusion rate. It has been found that reducing the area of the field can reduce the Ag content per unit volume, which increases due to diffusion.

また、本発明者らは、格子拡散係数にも着目し、この格子拡散係数がＮｉよりも小さい元素を通常のＮｉ基合金に大量に添加（ドープ）して格子拡散係数を小さくする（合金組成を変える）ことでも、拡散量を減らし得ることを見出して、本発明をするに至った。 The present inventors also pay attention to the lattice diffusion coefficient, and add (dope) a large amount of an element having a lattice diffusion coefficient smaller than Ni to a normal Ni-based alloy to reduce the lattice diffusion coefficient (alloy composition. It was found that the diffusion amount can be reduced also by changing ().

この際、粒界拡散係数及び格子拡散係数の双方を含む拡散係数として「実効拡散係数」の文言を用いることとした。 At this time, the word "effective diffusion coefficient" is used as the diffusion coefficient including both the grain boundary diffusion coefficient and the lattice diffusion coefficient.

すなわち、本発明の態様は、原子力施設における放射性核種を内包する一次冷却ヘリウムの循環路内に配置される原子力施設の回転機器であって、ケーシングと、前記ケーシング内において該ケーシングの内部を通過する前記放射性核種を内包する前記一次冷却ヘリウムと接触する回転翼及び翼軸を具備した回転機構を備え、前記ケーシング及び前記回転機構のうちの少なくとも前記回転機構の前記回転翼と前記翼軸は、前記放射性核種の拡散浸透を防止可能な単結晶材から成っている構成としている。 That is, an aspect of the present invention is a rotating device of a nuclear facility, which is arranged in a circulation path of primary cooling helium containing a radionuclide in a nuclear facility, and a casing and a casing that passes through the inside of the casing. A rotating mechanism comprising a rotating blade and a blade shaft that come into contact with the primary cooling helium containing the radionuclide, and the rotating blade and the blade shaft of at least the rotating mechanism of the casing and the rotating mechanism, It is made of a single crystal material that can prevent the diffusion and penetration of radionuclides.

本発明の第１の参考態様において、前記ケーシング及び前記回転機構のうちの少なくとも前記回転機構の前記回転翼及び前記翼軸は、前記多結晶合金の結晶粒径を粗大化して実効拡散係数を小さくして成る粗大結晶粒径材である構成としている。 In the first reference aspect of the present invention, at least the rotating blade and the blade shaft of the rotating mechanism of the casing and the rotating mechanism have a large effective crystal grain size of the polycrystalline alloy and a small effective diffusion coefficient. It is configured to be a material having a coarse crystal grain size.

本発明の第２の参考態様において、前記ケーシング及び前記回転機構のうちの少なくとも前記回転機構の前記回転翼及び前記翼軸は、前記単結晶材材と、Ｎｉよりも格子拡散係数が小さい元素をＮｉに添加して成る格子拡散係数低減材とを組み合わせたものである構成としている。 In the second reference aspect of the present invention, at least the rotary blade and the blade shaft of the rotating mechanism of the casing and the rotating mechanism are made of the single crystal material and an element having a lattice diffusion coefficient smaller than Ni. It is configured to be combined with a lattice diffusion coefficient reducing material added to Ni.

本発明に係る原子力施設の回転機器において、原子力施設には、原子炉を備えた原子力プラントのほか、核燃料再処理施設や燃料加工施設が含まれる。 In the rotating equipment of a nuclear facility according to the present invention, the nuclear facility includes a nuclear fuel reprocessing facility and a fuel processing facility as well as a nuclear plant equipped with a nuclear reactor.

また、本発明に係る原子力施設の回転機器において、回転機器には、遠心式のサーキュレータ（ポンプ）や軸流式のサーキュレータ（ポンプ）のほか、蒸気タービン、ガスタービン、ガスコンプレッサが含まれる。 In addition, in the rotating equipment of the nuclear facility according to the present invention, the rotating equipment includes a centrifugal circulator (pump) and an axial flow circulator (pump), as well as a steam turbine, a gas turbine, and a gas compressor.

さらに、本発明に係る原子力施設の回転機器において、放射性核種を内包する冷却流体には、ヘリウムや水やナトリウムを用いることができる。 Further, in the rotating equipment of the nuclear facility according to the present invention, helium, water or sodium can be used as the cooling fluid containing the radionuclide.

本発明に係る原子力施設の回転機器において、例えば、原子炉内で生じた核***生成物や、炉心構造材料が腐食することで生じた放射性腐食生成物等の放射性核種が、冷却流体に内包されてケーシングの内部に導入されて、回転機構の回転翼及び翼軸に接触しそして付着したとしても、ケーシング及び回転機構のうちの少なくとも回転機構の回転翼と翼軸が、放射性核種の拡散浸透を防止可能な単結晶材から成っているので、放射性核種が回転機構の回転翼及び翼軸の深部にまで拡散浸透することを少なく抑え得ることとなる。 In the rotating equipment of the nuclear facility according to the present invention, for example, fission products generated in the nuclear reactor, radioactive nuclides such as radioactive corrosion products generated by the corrosion of the core structure material, is included in the cooling fluid. Even if it is introduced into the casing and comes into contact with and adheres to the rotor blades and blade shafts of the rotating mechanism, at least the rotor blades and blade shafts of the casing and rotating mechanism prevent diffusion and penetration of radionuclides. Since it is made of a possible single crystal material, it is possible to suppress the radionuclide from diffusing and penetrating deep into the rotary blade and the blade shaft of the rotating mechanism.

加えて、ケーシング及び回転機構のうちの少なくとも回転機構の回転翼及び翼軸が放射性核種にほとんど汚染されないので、施設解体時における放射性廃棄物の量を低減させ得ることとなる。 In addition, since at least the rotor and the blade shaft of the rotating mechanism of the casing and the rotating mechanism are hardly contaminated with the radionuclide, the amount of radioactive waste at the time of dismantling the facility can be reduced.

本発明に係る原子力施設の回転機器では、少なくとも回転翼や翼軸を構成する材料の深部に放射性核種が拡散浸透するのを防ぐことができるので、メンテナンスコストの低減を実現することが可能であるという非常に優れた効果がもたらされる。 In the rotating equipment of the nuclear facility according to the present invention, since it is possible to prevent the radionuclide from diffusing and penetrating into the deep portion of the material forming at least the rotating blade or the blade shaft, it is possible to reduce the maintenance cost. That is a very good effect.

本発明の一実施例に係る原子力施設の回転機器が備えられた原子力プラントの冷却回路を示す概略構成説明図である。It is a schematic structure explanatory view showing a cooling circuit of a nuclear power plant provided with a rotating machine of a nuclear power plant concerning one example of the present invention. 図１における回転機器の回転機構部位を断面にして示す側面説明図である。It is a side surface explanatory view which shows the rotation mechanism part of the rotary machine in FIG. 1 in section. 一実施例に係る原子力施設の回転機器の効果を示すグラフである。It is a graph which shows the effect of the rotating equipment of the nuclear power plant which concerns on one Example. 他の実施例に係る原子力施設の回転機器の効果を示すグラフである。It is a graph which shows the effect of the rotating equipment of the nuclear power plant which concerns on another Example. 多結晶合金の表面付近における結晶粒及び結晶粒界を模型的に示す図である。FIG. 3 is a diagram schematically showing crystal grains and crystal grain boundaries in the vicinity of the surface of a polycrystalline alloy.

以下、本発明を図面に基づいて説明する。
図１及び図２は本発明に係る原子力施設の回転機器の一実施例を示しており、この実施例では、本発明に係る原子力施設の回転機器を原子力プラントのサーキュレータとして採用した場合を例に挙げて説明する。 The present invention will be described below with reference to the drawings.
1 and 2 show an embodiment of a rotating device for a nuclear facility according to the present invention. In this embodiment, a case where the rotating device for a nuclear facility according to the present invention is used as a circulator of a nuclear plant is taken as an example. I will give you an explanation.

図１に示すように、この原子力プラントは、高温ガス炉１と熱交換器３との間で放射性核種を内包する冷却流体としての一次冷却ヘリウムを循環させる一次冷却回路（循環路）２と、熱交換器３と図示しない発電設備との間で発電作動流体としての二次冷却ヘリウムを循環させる二次冷却回路４を備えている。 As shown in FIG. 1, this nuclear power plant has a primary cooling circuit (circulation path) 2 for circulating a primary cooling helium as a cooling fluid containing a radionuclide between a high temperature gas reactor 1 and a heat exchanger 3, A secondary cooling circuit 4 that circulates secondary cooling helium as a power generation working fluid between the heat exchanger 3 and a power generation facility (not shown) is provided.

この原子力プラントでは、一次冷却回路２を循環する一次冷却ヘリウムによって、高温ガス炉１内の核燃料における核***で発生した高温（約９５０℃）の熱を熱交換器３に運び、この熱交換器３において、二次冷却回路４を循環する二次冷却ヘリウムに一次冷却ヘリウムが保有する熱を移動させ、この二次冷却ヘリウムに移動した熱を発電設備に送って発電に供するようになっている。 In this nuclear power plant, the primary cooling helium circulating in the primary cooling circuit 2 carries the high temperature (about 950° C.) heat generated by the nuclear fission in the nuclear fuel in the high temperature gas reactor 1 to the heat exchanger 3, and the heat exchanger 3 In the above, the heat retained by the primary cooling helium is transferred to the secondary cooling helium circulating in the secondary cooling circuit 4, and the heat transferred to the secondary cooling helium is sent to the power generation equipment for power generation.

このような原子力プラントにおいて用いられるサーキュレータ（回転機器）１０は、高温ガス炉１及び熱交換器３間の一次冷却回路２において、二次冷却ヘリウムに熱を移動させた後の一次冷却ヘリウムを加速して高温ガス炉１に戻すものであって、このサーキュレータ１０は、図２に示すように、導入口１１ａ及び排出口１１ｂを具備したケーシング１１と、ケーシング１１内に収容されたインペラ（回転翼）１２と、モータ１３を備えている。 The circulator (rotating device) 10 used in such a nuclear power plant accelerates the primary cooling helium after transferring heat to the secondary cooling helium in the primary cooling circuit 2 between the high temperature gas reactor 1 and the heat exchanger 3. As shown in FIG. 2, the circulator 10 is for returning to the high temperature gas furnace 1 and a casing 11 having an inlet 11a and an outlet 11b, and an impeller (rotor blade) housed in the casing 11. ) 12 and a motor 13.

インペラ１２は、モータ１３の出力シャフト１３ａ（翼軸）に固定されて、この出力シャフト１３ａとともに回転機構を構成しており、このインペラ１２は、モータ１３の出力により回転して、ケーシング１１の導入口１１ａから内部に導入される熱交換器３からの一次冷却ヘリウムを加速して、排出口１１ｂから高温ガス炉１に向けて排出するようになっている。 The impeller 12 is fixed to the output shaft 13a (blade shaft) of the motor 13 and constitutes a rotation mechanism together with the output shaft 13a. The impeller 12 rotates by the output of the motor 13 to introduce the casing 11. The primary cooling helium from the heat exchanger 3 introduced into the inside from the port 11a is accelerated and discharged from the discharge port 11b toward the high temperature gas furnace 1.

一参考例において、サーキュレータ１０におけるケーシング１１及び回転機構のうちの少なくとも回転機構のインペラ１２及び出力シャフト１３ａは、多結晶合金（通常結晶粒径材）よりも実効拡散係数を低くした低実効拡散係数合金、すなわち、溶融金属を凝固させる際の冷却速度を遅くする、あるいは、熱処理を施すことで結晶粒径を粗大化して実効拡散係数を小さくした粗大結晶粒径材から成っている。 In one reference example, the casing 11 and the impeller 12 and the output shaft 13a of at least the rotating mechanism of the rotating mechanism of the circulator 10 have a low effective diffusion coefficient that is lower than that of a polycrystalline alloy (normal grain size material). It is made of an alloy, that is, a coarse crystal grain size material in which the cooling rate at the time of solidifying the molten metal is slowed or a heat treatment is performed to coarsen the crystal grain size to reduce the effective diffusion coefficient.

この実施例では、サーキュレータ１０におけるケーシング１１及び回転機構のうちの少なくとも回転機構のインペラ１２と出力シャフト１３ａに、溶融金属を一方向から凝固させることで単結晶化した放射性核種の拡散浸透を防止可能な単結晶材を用いている。 In this embodiment, it is possible to prevent the diffusion and permeation of the single crystallized radionuclide by solidifying the molten metal in one direction from the impeller 12 and the output shaft 13a of at least the rotating mechanism of the casing 11 and the rotating mechanism in the circulator 10. A single crystal material is used.

この実施例に係るサーキュレータ１０では、高温ガス炉１内で生じた核***生成物や、炉心構造材料が腐食することで生じた放射性腐食生成物等の放射性核種が、一次冷却ヘリウムに内包されてケーシング１１の内部に導入されて、回転機構のインペラ１２及び出力シャフト１３ａに接触しそして付着したとしても、回転機構のインペラ１２及び出力シャフト１３ａが、単結晶材から成っているので、放射性核種が回転機構のインペラ１２及び出力シャフト１３ａの深部にまで拡散浸透することを少なく抑え得ることとなる。 In the circulator 10 according to this embodiment, radioactive nuclides such as fission products generated in the high temperature gas reactor 1 and radioactive corrosion products generated by corrosion of the core structural material are enclosed in the primary cooling helium and casing. Even if it is introduced into the inside of 11 and comes into contact with and adheres to the impeller 12 and the output shaft 13a of the rotating mechanism, since the impeller 12 and the output shaft 13a of the rotating mechanism are made of a single crystal material, the radionuclide rotates. It is possible to suppress diffusion and permeation to the deep portions of the impeller 12 and the output shaft 13a of the mechanism.

その結果、メンテナンスコストの低減が図られることとなり、加えて、回転機構のインペラ１２及び出力シャフト１３ａが放射性核種にほとんど汚染されないので、施設解体時における放射性廃棄物の量を低減させ得ることとなる。 As a result, the maintenance cost can be reduced, and in addition, since the impeller 12 and the output shaft 13a of the rotating mechanism are hardly contaminated with radioactive nuclides, the amount of radioactive waste at the time of dismantling the facility can be reduced. ..

そこで、サーキュレータ１０の回転機構のインペラ１２及び出力シャフト１３ａに、多結晶合金（通常結晶粒径材）を用いた場合の放射性核種含有量と、上記した一参考例の粗大結晶粒径材を用いた場合の放射性核種含有量とを比較したところ、図３のグラフに示すように、多結晶合金（通常結晶粒径材）を用いた場合には、放射性核種が表面から奥深くにまで拡散浸透しているのに対して、一参考例の粗大結晶粒径材を用いた場合には、放射性核種が深部にまで拡散浸透していないことが判る。 Therefore, for the impeller 12 and the output shaft 13a of the rotating mechanism of the circulator 10, the content of radionuclide when a polycrystalline alloy (normal grain size material) is used and the coarse grain size material of the above-mentioned one reference example are used. When compared with the radionuclide content in the case where it is present, as shown in the graph of FIG. 3, when a polycrystalline alloy (normal grain size material) is used, the radionuclide diffuses and permeates deeply from the surface. On the other hand, when the coarse crystal grain size material of one reference example is used, it is understood that the radionuclide does not diffuse and penetrate into the deep part.

特に、実効拡散係数を多結晶合金（通常結晶粒径材）の１／１００に低減したこの実施例の単結晶材を用いた場合には、深部の放射性核種含有量が１／１０に低減していることが判る。 In particular, when the single crystal material of this example in which the effective diffusion coefficient was reduced to 1/100 of that of the polycrystalline alloy (normal grain size material), the radionuclide content in the deep portion was reduced to 1/10. I understand that.

したがって、この実施例に係るサーキュレータ１０では、回転機構のインペラ１２及び出力シャフト１３ａの深部に放射性核種が拡散浸透するのを防ぎ得ることが実証できた。 Therefore, it was demonstrated that the circulator 10 according to this example can prevent the diffusion and penetration of radionuclides into the deep parts of the impeller 12 and the output shaft 13a of the rotating mechanism.

上記した実施例では、回転機構のインペラ１２及び出力シャフト１３ａが、放射性核種の拡散浸透を防止可能な単結晶材から成っている場合を示したが、他の参考例として、回転機構のインペラ１２及び出力シャフト１３ａに、Ｎｉよりも格子拡散係数が小さい元素をＮｉに添加して成る格子拡散係数低減材を用いる場合があるほか、さらに他の参考例として、単結晶材とＮｉよりも格子拡散係数が小さい元素をＮｉに添加して成る格子拡散係数低減材とを組み合わせたものを用いる場合がある。 In the above-described embodiments, the case where the impeller 12 and the output shaft 13a of the rotating mechanism are made of a single crystal material capable of preventing the diffusion and penetration of radionuclides is shown, but as another reference example, the impeller 12 of the rotating mechanism is shown. In addition, a material having a lattice diffusion coefficient smaller than that of Ni added to Ni may be used for the output shaft 13a. In addition, as another reference example, a lattice diffusion of a single crystal material and that of Ni may be used. A combination of a lattice diffusion coefficient reducing material formed by adding an element having a small coefficient to Ni may be used.

そこで、サーキュレータ１０の回転機構のインペラ１２及び出力シャフト１３ａに、多結晶合金（通常結晶粒径材）を用いた場合の放射性核種含有量と、上記した他の参考例による格子拡散係数低減材を用いた場合の放射性核種含有量とを比較したところ、図４のグラフに示すように、多結晶合金（通常結晶粒径材）を用いた場合には、放射性核種が表面から奥深くにまで拡散浸透しているのに対して、格子拡散係数低減材を用いた場合には、放射性核種が深部にまで拡散浸透していないことが判る。 Therefore, for the impeller 12 and the output shaft 13a of the rotating mechanism of the circulator 10, the radionuclide content in the case of using a polycrystalline alloy (normal grain size material) and the lattice diffusion coefficient reducing material according to the other reference examples described above are used. When compared with the radionuclide content when used, as shown in the graph of Fig. 4, when a polycrystalline alloy (normal grain size material) is used, the radionuclide diffuses and penetrates deeply from the surface. On the other hand, when the lattice diffusion coefficient reducing material is used, it is understood that the radionuclide has not diffused and penetrated to the deep part.

したがって、上記した他の参考例に係るサーキュレータ１０にあっても、回転機構のインペラ１２及び出力シャフト１３ａの深部に放射性核種が拡散浸透するのを防ぎ得ることが判る。 Therefore, it can be seen that even in the circulator 10 according to the other reference example described above, the radionuclide can be prevented from diffusing and penetrating into the deep portions of the impeller 12 and the output shaft 13a of the rotating mechanism.

上記した実施例では、本発明に係る原子力施設の回転機器を原子力プラントのサーキュレータとして採用した場合を例に挙げて説明したが、これに限定されるものではなく、核燃料再処理施設や燃料加工施設における遠心式のサーキュレータ（ポンプ）や軸流式のサーキュレータ（ポンプ）や、蒸気タービンや、ガスタービンや、ガスコンプレッサとして採用することができる。 In the above-mentioned embodiment, the case where the rotating equipment of the nuclear facility according to the present invention is adopted as the circulator of the nuclear plant has been described as an example, but the present invention is not limited to this, and the nuclear fuel reprocessing facility or the fuel processing facility is not limited thereto. Can be used as a centrifugal circulator (pump), an axial circulator (pump), a steam turbine, a gas turbine, or a gas compressor.

また、上記した実施例では、回転機構のインペラ１２及び出力シャフト１３ａのみに、単結晶材を採用した構成としているが、これに限定されるものではなく、他の構成として、ケーシング１１にも単結晶材を用いてもよい。 Further, in the above-described embodiment, the single crystal material is adopted only in the impeller 12 and the output shaft 13a of the rotating mechanism, but the present invention is not limited to this, and as another structure, the single crystal material is used in the casing 11. A crystal material may be used.

本発明に係る原子力施設の回転機器の構成は、上記した実施例の構成に限定されるものではなく、例えば、回転機構の回転翼がブレードであってもよいほか、回転機構にタービンディスクや軸受やシール部材が含まれていてもよい。 The configuration of the rotating equipment of the nuclear power facility according to the present invention is not limited to the configuration of the above-described embodiment, and for example, the rotating blades of the rotating mechanism may be blades, or the rotating mechanism may include a turbine disk or a bearing. Or a seal member may be included.

１ 高温ガス炉
２ 一次冷却回路（循環路）
１０ サーキュレータ（回転機器）
１１ ケーシング
１２ インペラ（回転翼）
１３ モータ
１３ａ 出力シャフト（翼軸） 1 High-temperature gas furnace 2 Primary cooling circuit (circulation path)
10 Circulator (rotating equipment)
11 casing 12 impeller (rotor blade)
13 Motor 13a Output shaft (blade axis)

Claims (1)

原子力施設における放射性核種を内包する一次冷却ヘリウムの循環路内に配置される原子力施設の回転機器であって、
ケーシングと、
前記ケーシング内において該ケーシングの内部を通過する前記放射性核種を内包する前記一次冷却ヘリウムと接触する回転翼及び翼軸を具備した回転機構を備え、
前記ケーシング及び前記回転機構のうちの少なくとも前記回転機構の前記回転翼と前記翼軸は、前記放射性核種の拡散浸透を防止可能な単結晶材から成っている原子力施設の回転機器。 A rotating device of a nuclear facility arranged in a circulation path of primary cooled helium containing a radionuclide in a nuclear facility,
A casing,
A rotating mechanism having a rotary blade and a blade shaft in contact with the primary cooling helium containing the radionuclide passing through the inside of the casing,
At least the rotating blade and the blade axis of the rotating mechanism of the casing and the rotating mechanism are made of a single crystal material capable of preventing diffusion and penetration of the radionuclide.
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