INTEGRATED TYPE FAST NEUTRON REACTOR INCLUDING EXCLUSIVE SAFETY DEVICE FOR REDUCING CORE MELTDOWN ACCIDENT

• Main Authors: THIERRY BECK, MICHEL BELLIARD
• Format: Patent
• Language: English; Japanese
• Published: 24.02.2022
• Subjects: NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS

To provide an FNR-Na reactor improved in core behavior in a case of a complete core meltdown accident.SOLUTION: A main object of the present invention is an integrated type fast neutron reactor. The reactor includes: a main tank including an integrated type primary circuit including a core and a primary pump, an intermediate heat exchanger and a heat exchanger for exhausting surplus energy, and a redan for splitting heat transfer fluid into a hot collector (12) and a cold collector. The core includes a safety device formed of at least one basic safety device (45) exclusive for reducing a core meltdown accident, including a transfer pipe (40) and a penetration pipe (42) arranged by penetrating through a diagrid (30) and a strong back (31) and opened at a bottom of the tank. The transfer pipe (40) has one or more injection nozzles and a thin zone for heightening penetration speed in a case of a core meltdown accident, and a device (41) for recovering molten fuel is arranged at the bottom of the tank.SELECTED DRAWING: Figure 4 【課題】完全炉心溶融事故の場合のＦＮＲ－Ｎａ原子炉の炉心の挙動を改善する。【解決手段】本発明の主な対象は一体型高速中性子原子炉であり、当該原子炉は、炉心および一次ポンプ含む一体型一次回路を含むメインタンクと、中間熱交換器および余剰エネルギーを排出するための熱交換器と、熱伝達流体をホットコレクター（１２）とコールドコレクターとに分離するレダンとを含み、炉心は、移送管（４０）と、ダイアグリッド（３０）およびストロングバック（３１）を貫通して配置されタンクの底部に開口する貫通管（４２）とを含む、炉心溶融事故の軽減専用の少なくとも一つの基本安全装置（４５）から構成される安全装置を含み、移送管（４０）は、一つ以上の注入ノズルと、炉心溶融事故の場合に貫通速度を高めるための薄肉ゾーンとを備え、溶融燃料を回収するための装置（４１）はタンクの底部に配置される。【選択図】図４