JP6719406B2 - 熱中性子炉炉心および熱中性子炉炉心の設計方法 - Google Patents
熱中性子炉炉心および熱中性子炉炉心の設計方法 Download PDFInfo
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- JP6719406B2 JP6719406B2 JP2017049738A JP2017049738A JP6719406B2 JP 6719406 B2 JP6719406 B2 JP 6719406B2 JP 2017049738 A JP2017049738 A JP 2017049738A JP 2017049738 A JP2017049738 A JP 2017049738A JP 6719406 B2 JP6719406 B2 JP 6719406B2
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/06—Casings; Jackets
- G21C3/07—Casings; Jackets characterised by their material, e.g. alloys
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/28—Fuel elements with fissile or breeder material in solid form within a non-active casing
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C5/00—Moderator or core structure; Selection of materials for use as moderator
- G21C5/02—Details
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C5/00—Moderator or core structure; Selection of materials for use as moderator
- G21C5/12—Moderator or core structure; Selection of materials for use as moderator characterised by composition, e.g. the moderator containing additional substances which ensure improved heat resistance of the moderator
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/02—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect
- G21C7/04—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect of burnable poisons
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
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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
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- 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
一方、一般的に、原子炉の炉心は、負の温度反応度係数を有することが求められる。したがって、負の温度反応度係数を有しない炉心の場合には、炉心の温度に応じた制御棒操作などが必要となり、炉心の十分な安全性を確保できないことになる。
また、本実施形態は、中性子を減速する減速材を含み一方向に延びた固体状の減速部材と、核分裂性物質を含み、前記減速部材に並列に延びて、前記減速部材中に分散して収納された燃料部材と、前記減速部材に並列に延びた複数の冷却管と、を有する熱中性子炉炉心であって、前記燃料部材の一部が可燃性毒物を含むことにより、運転温度領域において運転温度が増加すると、当該熱中性子炉炉心の実効増倍率keffが単調に減少し、前記可燃性毒物は、複数の濃縮した同位体からなる、ことを特徴とする。
ρ=(keff−1)/keff ・・・(1)
以上、本発明の実施形態を説明したが、実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。
Claims (6)
- 中性子を減速する減速材を含み一方向に延びた固体状の減速部材と、
核分裂性物質を含み、前記減速部材に並列に延びて、前記減速部材中に分散して収納された燃料部材と、
前記減速部材に並列に延びた複数の冷却管と、
を有する熱中性子炉炉心であって、
前記減速部材と前記燃料部材のそれぞれは、互いに同軸の円筒層状であり、互いに径方向に交互に配列されており、
前記燃料部材の一部が可燃性毒物を含むことにより、運転温度領域において運転温度が増加すると、当該熱中性子炉炉心の実効増倍率keffが単調に減少する、
ことを特徴とする熱中性子炉炉心。 - 前記減速材は金属水素化物であることを特徴とする請求項1に記載の熱中性子炉炉心。
- 前記可燃性毒物は、少なくとも一つの濃縮した同位体からなることを特徴とする請求項1または請求項2に記載の熱中性子炉炉心。
- 中性子を減速する減速材を含み一方向に延びた固体状の減速部材と、
核分裂性物質を含み、前記減速部材に並列に延びて、前記減速部材中に分散して収納された燃料部材と、
前記減速部材に並列に延びた複数の冷却管と、
を有する熱中性子炉炉心であって、
前記燃料部材の一部が可燃性毒物を含むことにより、運転温度領域において運転温度が増加すると、当該熱中性子炉炉心の実効増倍率keffが単調に減少し、
前記可燃性毒物は、複数の濃縮した同位体からなる、
ことを特徴とする熱中性子炉炉心。 - 前記複数の濃縮した同位体は、濃縮したカドミウム113および濃縮したユーロピウム151であることを特徴とする請求項4に記載の熱中性子炉炉心。
- 前記燃料部材と前記減速部材との間に配されて、中性子を増倍する中性子増倍部材をさらに備えることを特徴とする請求項1ないし請求項5のいずれか一項に記載の熱中性子炉炉心。
あ
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JP2017049738A JP6719406B2 (ja) | 2017-03-15 | 2017-03-15 | 熱中性子炉炉心および熱中性子炉炉心の設計方法 |
FR1852042A FR3064105B1 (fr) | 2017-03-15 | 2018-03-09 | Coeur de reacteur a neutrons thermiques et procede de conception d'un coeur de reacteur a neutrons thermiques |
US15/921,891 US11177045B2 (en) | 2017-03-15 | 2018-03-15 | Thermal-neutron reactor core and design method for thermal-neutron reactor core |
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RU2021127618A (ru) * | 2018-06-21 | 2021-11-16 | БВКсТ НЬЮКЛИАР ЭНЕРДЖИ, ИНК. | Универсальный инвертированный реактор и способ для проектирования и изготовления универсального инвертированного реактора |
JP7225061B2 (ja) * | 2019-08-29 | 2023-02-20 | 株式会社東芝 | 原子炉および原子炉の運転方法 |
PL4022649T3 (pl) * | 2019-10-15 | 2024-05-06 | Nuscale Power, Llc | Reaktory jądrowe, w których stosuje się paliwa i/lub moderatory w postaci ciekłych stopów metali |
JP7273743B2 (ja) * | 2020-02-10 | 2023-05-15 | 株式会社東芝 | 毒物添加炉心および宇宙用原子炉 |
JP7374844B2 (ja) | 2020-05-11 | 2023-11-07 | 株式会社東芝 | 原子炉および原子炉の除熱方法 |
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