JP6434305B2 - Control rod guide tube for fast reactor - Google Patents
Control rod guide tube for fast reactor Download PDFInfo
- Publication number
- JP6434305B2 JP6434305B2 JP2014264483A JP2014264483A JP6434305B2 JP 6434305 B2 JP6434305 B2 JP 6434305B2 JP 2014264483 A JP2014264483 A JP 2014264483A JP 2014264483 A JP2014264483 A JP 2014264483A JP 6434305 B2 JP6434305 B2 JP 6434305B2
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- guide tube
- rod guide
- fast reactor
- recess
- 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.)
- Active
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
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Description
本発明は、例えば液体金属ナトリウムなどの冷却材を使用する高速炉の制御棒案内管に係り、特に高速炉の炉心損傷事故において、溶融燃料（損傷炉心物質）が制御棒案内管の周壁を溶融して侵入した場合の溶融燃料（損傷炉心物質）の御棒案内管からの排出機構に関するものである。 The present invention relates to a control rod guide tube of a fast reactor that uses a coolant such as liquid metal sodium, for example, and particularly in a core damage accident of a fast reactor, molten fuel (damaged core material) melts the peripheral wall of the control rod guide tube. It is related with the discharge | emission mechanism from the rod guide tube of the molten fuel (damaged core material) at the time of entering.
ナトリウム冷却高速炉の炉心損傷事故において、燃料移動による再臨界を防止するためには、制御棒案内管を通じて損傷炉心物質を炉心外へ流出することが有効である。 In order to prevent recriticality due to fuel movement in a core damage accident of a sodium-cooled fast reactor, it is effective to flow the damaged core material out of the core through a control rod guide tube.
図４は、制御棒集合体の基本的な構造図である。同図に示すように制御棒集合体１は、制御棒２と、その制御棒２を個別に収容する制御棒案内管３から主に構成されている。 FIG. 4 is a basic structural diagram of the control rod assembly. As shown in the figure, the control rod assembly 1 is mainly composed of a control rod 2 and a control rod guide tube 3 that individually accommodates the control rod 2.
制御棒案内管３の下端部には先細り状になったエントランスノズル４が設けられ、制御棒案内管３の内側の軸方向途中には縮径になった段部５が設けられ、その段部５の上にはダッシュポット(緩衝器)６が設置されている。 A tapered entrance nozzle 4 is provided at the lower end portion of the control rod guide tube 3, and a step portion 5 having a reduced diameter is provided in the middle of the control rod guide tube 3 in the axial direction. A dashpot (buffer) 6 is installed on 5.
ダッシュポット６は凹部７を有し、全体の断面形状が略凹形をしており、凹部７の下部には円筒状の脚部８が設けられ、脚部８の内周部側から外周部側に向けて貫通した穴９が脚部８の周方向に沿って複数個形成されている。 The dashpot 6 has a recess 7, and the overall cross-sectional shape is substantially concave. A cylindrical leg portion 8 is provided at the lower portion of the recess 7, and an outer peripheral portion from the inner peripheral side of the leg portion 8. A plurality of holes 9 penetrating toward the side are formed along the circumferential direction of the leg portion 8.
ダッシュポット６の外径は、制御棒案内管３の内径よりも若干小さく、また、段部５の内径よりも若干大きく設計されており、ダッシュポット６を段部５の上に設置すると、制御棒案内管３とダッシュポット６の間に隙間１０が形成される。 The outer diameter of the dash pot 6 is designed to be slightly smaller than the inner diameter of the control rod guide tube 3 and slightly larger than the inner diameter of the step portion 5. A gap 10 is formed between the bar guide tube 3 and the dashpot 6.
冷却材である液体金属ナトリウム１１は、制御棒案内管３のエントランスノズル４側から流入し、制御棒案内管３の内側を上昇し、ダッシュポット６の穴９を通って、制御棒案内管３とダッシュポット６の間の隙間１０に流入し、制御棒２を冷却しながら制御棒案内管３の上部に至る。 Liquid metal sodium 11 as a coolant flows in from the entrance nozzle 4 side of the control rod guide tube 3, rises inside the control rod guide tube 3, passes through the hole 9 of the dashpot 6, and passes through the control rod guide tube 3. And flows into the gap 10 between the dashpot 6 and reaches the upper portion of the control rod guide tube 3 while cooling the control rod 2.
図５は原子炉容器の内部の構造例を示す図で、図中の符号１２は原子炉容器、１３は液体金属ナトリウム流入配管、１４は液体金属ナトリウム流出配管、１５は炉心槽、１６は上部炉心支持板、１７は下部炉心支持板、１８は連絡管であり、図に示すような配置、構造になっている。 FIG. 5 is a diagram showing an example of the internal structure of the reactor vessel. In the figure, reference numeral 12 denotes a reactor vessel, 13 denotes a liquid metal sodium inflow pipe, 14 denotes a liquid metal sodium outflow pipe, 15 denotes a core tank, and 16 denotes an upper part. A core support plate, 17 is a lower core support plate, and 18 is a connecting pipe, which is arranged and structured as shown in the figure.
図６は、原子炉容器内での液体金属ナトリウムの流れの一部を示す図である。同図に示すように上部炉心支持板１６と下部炉心支持板１７の間に連絡管１８が架設されており、連絡管１８の内側に液体金属ナトリウム１１の流量を調整する流量調整部２０が設置されている。 FIG. 6 is a diagram showing a part of the flow of liquid metal sodium in the reactor vessel. As shown in the figure, a connecting pipe 18 is installed between the upper core support plate 16 and the lower core support plate 17, and a flow rate adjusting unit 20 for adjusting the flow rate of the liquid metal sodium 11 is installed inside the connecting pipe 18. Has been.
この流量調整部２０は、例えば、複数の孔２１を開けた金属板２２を連絡管１８の内側に所定の間隔をおいて、孔２１が互いに重ならないように複数枚軸方向に設置した構造になっている。 The flow rate adjusting unit 20 has, for example, a structure in which a plurality of metal plates 22 having a plurality of holes 21 are installed in the axial direction so that the holes 21 do not overlap each other with a predetermined interval inside the connecting pipe 18. It has become.
液体金属ナトリウム１１は図５に示すように、液体金属ナトリウム流入配管１３によって原子炉容器１２内の下部に供給され、原子炉容器１２の下部から上昇して、図６に示すように連絡管１８の下部から入り込み、各金属板２２の孔２１を通過する際の流動抵抗により、液体金属ナトリウム１１の通過流量が制限され、それによって液体金属ナトリウム１１の流量調整がなされる。 As shown in FIG. 5, the liquid metal sodium 11 is supplied to the lower part of the reactor vessel 12 by the liquid metal sodium inflow pipe 13 and rises from the lower part of the reactor vessel 12, and as shown in FIG. The flow rate of the liquid metal sodium 11 is limited by the flow resistance when entering from the lower part of the metal plate 22 and passing through the holes 21 of the respective metal plates 22, thereby adjusting the flow rate of the liquid metal sodium 11.
図４に示すように、制御棒案内管３のエントランスノズル４が連絡管１８の上部に差し込まれているから、流量調整された液体金属ナトリウム１１は連絡管１８を出て制御棒案内管３に入る。 As shown in FIG. 4, the entrance nozzle 4 of the control rod guide tube 3 is inserted into the upper portion of the connecting tube 18, so that the liquid metal sodium 11 whose flow rate has been adjusted exits the connecting tube 18 and enters the control rod guide tube 3. enter.
そして液体金属ナトリウム１１は、ダッシュポット６の穴９を通って制御棒案内管３とダッシュポット６の間に形成された隙間１０に流入して制御棒２を冷却し、制御棒案内管３の上部から排出される。 Then, the liquid metal sodium 11 flows into the gap 10 formed between the control rod guide tube 3 and the dashpot 6 through the hole 9 of the dashpot 6 to cool the control rod 2, and It is discharged from the top.
図７は炉心配置図で、図中の符号２３は炉心燃料集合体、２５は径方向ブランケット燃料集合体、２６は遮蔽体、２８は制御棒集合体であり、図に示すような配置になっている。 FIG. 7 is a core layout diagram. Reference numeral 23 in the figure is a core fuel assembly, 25 is a radial blanket fuel assembly, 26 is a shield, and 28 is a control rod assembly. ing.
図７に示すように、燃料集合体２３の約１０体に対して、制御棒集合体２８が１体程度の割合で設けられており、各制御棒集合体２８が燃料集合体２３群の中に所定の間隔をおいて分散されている。 As shown in FIG. 7, about one control rod assembly 28 is provided for about 10 fuel assemblies 23, and each control rod assembly 28 is included in the group of fuel assemblies 23. Are distributed at predetermined intervals.
なお、原子炉でシビア・アクシデントが発生した場合の対応策に関する先行技術文献として、例えば特公平５−８０６３６号公報（特許文献１）や特開平５−３４１０８１号公報（特許文献２）などを挙げることができる。 In addition, as prior art documents regarding countermeasures in the event of a severe accident in a nuclear reactor, for example, Japanese Patent Publication No. 5-80636 (Patent Document 1) and Japanese Patent Application Laid-Open No. 5-341081 (Patent Document 2) are cited. be able to.
原子炉の定格運転に際しては、制御棒集合体１に対する液体金属ナトリウム１１の定格流量を確保する必要があり、そのために前述した流量調整部２０が設けられている。しかしながら、設計基準を超える事故により炉心が損傷して溶融するシビア・アクシデントを考慮すると、図４に示す制御棒集合体１の構造では改善すべき問題点がある。 In the rated operation of the nuclear reactor, it is necessary to ensure the rated flow rate of the liquid metal sodium 11 with respect to the control rod assembly 1, and the flow rate adjusting unit 20 described above is provided for this purpose. However, considering the severe accident that the core is damaged and melts due to an accident exceeding the design standard, there is a problem to be improved in the structure of the control rod assembly 1 shown in FIG.
ナトリウム冷却高速炉でのシビア・アクシデントでは、炉心の核的な特性により、原子炉の出力が増加する可能性がある。原子炉の核的活性度を低下させて安定状態に移行させるためには、シビア・アクシデントにおいて生じた溶融燃料を炉心外へ流出させることが効果的である。 In severe accidents in sodium-cooled fast reactors, the nuclear power of the reactor may increase the reactor power. In order to reduce the nuclear activity of the nuclear reactor and shift it to a stable state, it is effective to let molten fuel generated in a severe accident flow out of the core.
ナトリウム冷却高速炉の燃料集合体は稠密ピン束で構成されており図７に示されているように、燃料集合体２３の約１０体に対して制御棒集合体２８が１体程度の割合で燃料集合体２３群中に分散されているから、制御棒集合体２８が溶融燃料の有効な流出経路となる。 The fuel assembly of the sodium-cooled fast reactor is composed of dense pin bundles, and as shown in FIG. 7, the control rod assembly 28 is in a ratio of about 1 to about 10 fuel assemblies 23. Since the fuel rods 23 are dispersed in the group of fuel assemblies 23, the control rod assemblies 28 serve as an effective flow path for the molten fuel.
しかしながら、図４に示す下方に流量調整部２０を備えた制御棒集合体１では溶融燃料の流出が妨げられて、原子炉が核的に安定状態に移行しない可能性があることが判明した。 However, it has been found that in the control rod assembly 1 provided with the flow rate adjusting unit 20 below shown in FIG. 4, the outflow of the molten fuel is hindered and the nuclear reactor may not shift to a nuclear stable state.
図８（ａ）〜（ｃ）は、制御棒集合体１への溶融燃料（損傷炉心物質）３１の侵入から流量調整部２０による溶融燃料３１の流出阻止までの経過を説明する図である。 FIGS. 8A to 8C are diagrams for explaining a process from the intrusion of the molten fuel (damaged core material) 31 to the control rod assembly 1 until the flow rate adjusting unit 20 prevents the molten fuel 31 from flowing out.
図８（ａ）に示すように、溶融燃料３１が制御棒集合体１の周壁を溶融して侵入すると、制御棒集合体１内にある液体金属ナトリウム１１と溶融燃料３１の熱的相互作用３２により、図８（ｂ）に示すように制御棒集合体１内のダッシュポット６ の上方にナトリウムボイド領域３３が形成され、それが発達する。 As shown in FIG. 8A, when the molten fuel 31 melts and enters the peripheral wall of the control rod assembly 1, the thermal interaction 32 between the liquid metal sodium 11 and the molten fuel 31 in the control rod assembly 1. As a result, a sodium void region 33 is formed above the dashpot 6 in the control rod assembly 1 as shown in FIG.
また、溶融燃料３１の一部は制御棒案内管３とダッシュポット６の間の隙間１０にも入り込むが、流量調整部２０により下方の流動抵抗が大きいから、初期状態では溶融燃料３１は制御棒２および制御棒２と制御棒案内管３の隙間を通って、制御棒集合体１内の上部に分散３４する。 Further, a part of the molten fuel 31 also enters the gap 10 between the control rod guide tube 3 and the dashpot 6, but because the lower flow resistance is large by the flow rate adjusting unit 20, the molten fuel 31 is controlled by the control rod in the initial state. 2 and through the gap between the control rod 2 and the control rod guide tube 3, the dispersion 34 is distributed in the upper part of the control rod assembly 1.
図８（ｃ）に示すように、制御棒２および制御棒２と制御棒案内管３の隙間に入り込んだ溶融燃料３１が固化して隙間が閉塞３５されても、溶融燃料３１の侵入は引き続き起こり、溶融燃料３１はダッシュポット６の周囲に溜り、溶融燃料３１の固化とダッシュポット６の存在により閉塞３５が起こる。
また、ダッシュポット６ の所で閉塞３５しない場合、溶融燃料３１はダッシュポット６の穴９を通って下方に移動３６し、流量調整部２０の上面まで流下しそこで停止して、固化による閉塞３５が起こる。図８（ｃ）は、この状態を示している。
As shown in FIG. 8C, even when the molten fuel 31 that has entered the gap between the control rod 2 and the control rod 2 and the control rod guide tube 3 is solidified and the gap is closed 35, the molten fuel 31 continues to enter. As a result, the molten fuel 31 accumulates around the dashpot 6, and a blockage 35 occurs due to the solidification of the molten fuel 31 and the presence of the dashpot 6.
When the dash pot 6 is not blocked 35, the molten fuel 31 moves downward 36 through the hole 9 of the dash pot 6, flows down to the upper surface of the flow rate adjusting unit 20, stops there, and is blocked by solidification 35. Happens. FIG. 8C shows this state.
このように図４に示す制御棒集合体１の構造では、特に流量調整部２０で溶融燃料３１の流出が妨げられて、原子炉が核的に安定状態に移行しない可能性があることが判明した。 As described above, in the structure of the control rod assembly 1 shown in FIG. 4, it is found that there is a possibility that the nuclear reactor may not shift to a nuclear stable state because the flow rate adjustment unit 20 prevents the molten fuel 31 from flowing out. did.
本発明はこのような技術背景においてなされたものであり、その目的は、炉心の核的活性度を低下させて原子炉を安定状態に移行させるために有効な手段である、溶融燃料の炉心外への流出を促進させることのできる高速炉の制御棒案内管を提供することにある。 The present invention has been made in such a technical background, and an object of the present invention is to provide an effective means for lowering the nuclear activity of the core and shifting the reactor to a stable state. The purpose of the present invention is to provide a control rod guide tube for a fast reactor that can promote the outflow to the reactor.
前記目的を達成するため、本発明の第１の手段は、断面形状が略凹形の例えばダッシュポットなどの流路内構造物を内側に収容した高速炉の制御棒案内管において、
前記流路内構造物の略凹形を形成する凹部内に流入・堆積した溶融燃料の熱により昇温して溶断することのできる肉薄部を、前記凹部の周壁に当該凹部の周方向に沿って連続して設けたことを特徴とするものである。
In order to achieve the above object, the first means of the present invention is a control rod guide tube of a fast reactor in which a structure in a flow channel such as a dashpot having a substantially concave cross section is accommodated inside, for example,
The thin portion that can be blown by more heated to the heat of the molten fuel flowing-deposited into the recess to form a substantially concave in the channel structure, the circumferential direction of the concave portion on the peripheral wall of the recess It is characterized by being provided continuously along.
本発明の第２の手段は前記第１の手段において、前記肉薄部を前記凹部の底部近傍に設けたことを特徴とするものである。 According to a second means of the present invention, in the first means, the thin portion is provided in the vicinity of the bottom of the recess.
本発明の第３の手段は前記第１または第２の手段において、当該制御棒案内管の前記流路内構造物の収容位置より下方に、前記凹部の底部の外径Ｄ３より径大の内径Ｄ４を有する排出筒部が下方に向けて形成され、前記凹部の底部が排出筒部側に臨んでいることを特徴とするものである。 According to a third means of the present invention, in the first or second means, an inner diameter larger than the outer diameter D3 of the bottom portion of the concave portion below the housing position of the flow passage structure of the control rod guide tube. A discharge cylinder portion having D4 is formed downward, and the bottom of the recess faces the discharge cylinder portion side.
本発明の第４の手段は前記第１ないし第３のいずれかの手段において、当該制御棒案内管の内側途中に縮径されて内径Ｄ２の段部が形成され、前記段部の内径Ｄ２よりも小径の外径Ｄ１を有する前記流路内構造物の凹部を前記段部の内側に収容して、前記段部と前記凹部の間に隙間が形成され、前記隙間により当該制御棒案内管内を流通する冷却材の流量が調整されることを特徴とするものである。 According to a fourth means of the present invention, in any one of the first to third means, a diameter is reduced in the middle of the control rod guide tube to form a step portion having an inner diameter D2. From the inner diameter D2 of the step portion, A recess in the flow passage structure having a small outer diameter D1 is accommodated inside the stepped portion, and a gap is formed between the stepped portion and the recessed portion. The flow rate of the circulating coolant is adjusted.
本発明の第５の手段は前記第１ないし第４のいずれかの手段において、前記冷却材が液体金属ナトリウムであることを特徴とするものである。 According to a fifth means of the present invention, in any one of the first to fourth means, the coolant is liquid metal sodium.
本発明の第６の手段は前記第１ないし第５のいずれかの手段において、前記流路内構造物がダッシュポットであることを特徴とするものである。 According to a sixth means of the present invention, in any one of the first to fifth means, the structure in the flow path is a dashpot.
本発明は前述のような構成になっており、溶融燃料の炉心外への流出を促進させることのできる高速炉の制御棒案内管を提供することができる。 The present invention is configured as described above, and can provide a control rod guide tube for a fast reactor capable of promoting the outflow of molten fuel to the outside of the core.
次に本発明の実施例を図面とともに説明する。図1は本発明の実施例に係る制御棒集合体の構造図、図２は本発明の実施例に係る制御棒案内管の要部拡大断面図である。 Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a structural diagram of a control rod assembly according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of a control rod guide tube according to an embodiment of the present invention.
制御棒集合体４０は、制御棒２と、その制御棒２を個別に収容する制御棒案内管４１から主に構成されている。 The control rod assembly 40 is mainly composed of a control rod 2 and a control rod guide tube 41 that individually accommodates the control rod 2.
制御棒案内管４１の下端部には先細り状になったエントランスノズル４２が設けられ、制御棒案内管４１の内側途中には縮径になった段部４３と、その段部４３の下部からエントランスノズル４２の下端開口部までストレートに真下に延びた排出筒部４４が形成され、段部４３の内側にダッシュポット(緩衝器)４５が収容される。 A tapered entrance nozzle 42 is provided at the lower end of the control rod guide tube 41, and a stepped portion 43 having a reduced diameter is provided in the middle of the control rod guide tube 41, and an entrance from the lower portion of the stepped portion 43. A discharge cylinder portion 44 is formed that extends straight down to the lower end opening of the nozzle 42, and a dash pot (buffer) 45 is accommodated inside the step portion 43.
なお、高速炉の通常運転時には排出筒部４４は、図１に示すように液体金属ナトリウム１１の流通路の一部を形成している。 During normal operation of the fast reactor, the discharge cylinder portion 44 forms a part of the flow path of the liquid metal sodium 11 as shown in FIG.
ダッシュポット４５の全体の断面形状は略凹形をしており、ダッシュポット４５の上端外周につば部４６が設けられ、つば部４６の下部に前記略凹形を形成する凹部４７が一体に形成されている。 The entire cross-sectional shape of the dashpot 45 is substantially concave, and a collar portion 46 is provided on the outer periphery of the upper end of the dashpot 45, and a concave portion 47 that forms the substantially concave shape is formed integrally with the lower portion of the collar portion 46. Has been.
図２に示すように、凹部４７の周壁の外径Ｄ１は段部４３の内径Ｄ２よりも若干小径（Ｄ１＜Ｄ２）で、凹部４７の周壁には周方向に沿って複数個の穴４８が形成されている。 As shown in FIG. 2, the outer diameter D1 of the peripheral wall of the recess 47 is slightly smaller than the inner diameter D2 of the stepped portion 43 (D1 <D2), and the peripheral wall of the recess 47 has a plurality of holes 48 along the circumferential direction. Is formed.
図１に示すように、制御棒案内管４１の上部からダッシュポット４５を制御棒案内管４１の内側に挿入し、ダッシュポット４５のつば部４６を制御棒案内管４１の段部４３の上に載置すると、ダッシュポット４５の凹部４７が段部４３の内側に収容され、炉心の下部付近に設置される。 As shown in FIG. 1, the dash pot 45 is inserted into the control rod guide tube 41 from the top of the control rod guide tube 41, and the collar portion 46 of the dash pot 45 is placed on the stepped portion 43 of the control rod guide tube 41. When placed, the concave portion 47 of the dash pot 45 is accommodated inside the stepped portion 43 and installed near the lower portion of the core.
このようにしてダッシュポット４５を収容すると、凹部４７の周壁と段部４３との間に、冷却材である液体金属ナトリウム１１が流通する隙間４９（図２参照）が形成される。この隙間４９は、凹部４７の周壁の穴４８を介して凹部４７の内部と連通している。 When the dashpot 45 is housed in this way, a gap 49 (see FIG. 2) is formed between the peripheral wall of the recess 47 and the stepped portion 43 in which the liquid metal sodium 11 as the coolant flows. The gap 49 communicates with the inside of the recess 47 through a hole 48 in the peripheral wall of the recess 47.
この隙間４９はそこを流通する液体金属ナトリウム１１の流量を調整（規制）する機能を有しており、従って制御棒案内管４１の段部４３と、ダッシュポット４５の凹部４７とで液体金属ナトリウム１１の流量調整部を構成している。従って図４に示すように、連絡管１８内に流量調整部２０を設ける必要がなく、部品点数の削減と、組み立て工数の削減が図れる。 The gap 49 has a function of adjusting (restricting) the flow rate of the liquid metal sodium 11 flowing therethrough. Therefore, the liquid metal sodium is formed by the step 43 of the control rod guide tube 41 and the recess 47 of the dashpot 45. 11 flow rate adjusters. Therefore, as shown in FIG. 4, it is not necessary to provide the flow rate adjusting unit 20 in the connecting pipe 18, and the number of parts and the number of assembly steps can be reduced.
また、図２に示すように、制御棒案内管４１内にダッシュポット４５を装着した状態で凹部４７の底部５０は、制御棒案内管４１の段部４３と排出筒部４４の連結部付近に位置している。 Further, as shown in FIG. 2, the bottom 50 of the recess 47 with the dashpot 45 mounted in the control rod guide tube 41 is located near the connecting portion between the step 43 of the control rod guide tube 41 and the discharge tube portion 44. positioned.
そして制御棒案内管４１の排出筒部４４の内径Ｄ４は、ダッシュポット４５の底部５０の外径Ｄ３よりも十分に大きく設計されており（Ｄ３≪Ｄ４）、底部５０が排出筒部４４側に臨んでいる。 The inner diameter D4 of the discharge tube portion 44 of the control rod guide tube 41 is designed to be sufficiently larger than the outer diameter D3 of the bottom portion 50 of the dash pot 45 (D3 << D4), and the bottom portion 50 is located on the discharge tube portion 44 side. I'm here.
さらに、凹部４７の周壁の外周面で底部５０の直上近傍には、凹部４７の周方向に連続して延びた凹溝５１が設けられ、それによって凹部４７の周方向に連続して延びた肉薄部５２が形成されている。 Further, a groove 51 extending continuously in the circumferential direction of the recess 47 is provided in the vicinity of the outer peripheral surface of the peripheral wall of the recess 47 and immediately above the bottom 50, thereby thinning continuously extending in the circumferential direction of the recess 47. A portion 52 is formed.
図３（ａ），（ｂ）は、制御棒集合体４０への溶融燃料（損傷炉心物質）３１の侵入から流出までの経過を説明する図である。 FIGS. 3A and 3B are views for explaining the course from the intrusion of molten fuel (damaged core material) 31 to the control rod assembly 40 until the outflow.
図３（ａ）に示すように、溶融燃料３１が制御棒集合体１の周壁を溶融して侵入すると、ダッシュポット４５の凹部４７内に流入して堆積する。 As shown in FIG. 3A, when the molten fuel 31 melts and enters the peripheral wall of the control rod assembly 1, it flows into the recess 47 of the dashpot 45 and accumulates.
図２に示すダッシュポット４５のつば部４６の内周面に形成された傾斜面５３は、侵入した溶融燃料３１をダッシュポット４５の凹部４７内に導くガイドとして機能する。 An inclined surface 53 formed on the inner peripheral surface of the collar portion 46 of the dash pot 45 shown in FIG. 2 functions as a guide for guiding the intruded molten fuel 31 into the recess 47 of the dash pot 45.
ダッシュポット４５の肉薄部５２は、凹部４７内に堆積した高温の溶融燃料３１の熱容量効果で昇温して、溶断する。換言すれば、肉薄部５２の厚さは、凹部４７内に堆積した溶融燃料３１の熱容量によって溶断できる程度の厚さに設計されていることになる。 The thin portion 52 of the dash pot 45 is heated and melted by the heat capacity effect of the high-temperature molten fuel 31 deposited in the recess 47. In other words, the thickness of the thin portion 52 is designed to a thickness that can be melted by the heat capacity of the molten fuel 31 deposited in the recess 47.
そして図３（ｂ）に示すように、肉薄部５２の溶断に伴い、ダッシュポット４５の下部５０はダッシュポット４５の本体から離れ、堆積した溶融燃料３１と一緒に排出筒部４４から入口プレナムに向かって落下５４して、溶融燃料３１を排出することができる。 As shown in FIG. 3 (b), the lower part 50 of the dash pot 45 is separated from the main body of the dash pot 45 as the thin part 52 is melted, and is discharged from the discharge cylinder part 44 to the inlet plenum together with the accumulated molten fuel 31. The molten fuel 31 can be discharged by dropping 54 toward the end.
前述のように、制御棒案内管４１の排出筒部４４の内径Ｄ４は、ダッシュポット４５の下部５０の外径Ｄ３よりも十分に大きく設計されているから（Ｄ３≪Ｄ４）、堆積した溶融燃料（溶融炉心物質）３１は従来のように停滞することなくスムーズに排出でき、制御棒案内管４１は再臨界を排除するための有効な排出手段となる。 As described above, the inner diameter D4 of the discharge cylinder portion 44 of the control rod guide tube 41 is designed to be sufficiently larger than the outer diameter D3 of the lower portion 50 of the dash pot 45 (D3 << D4). The (melting core material) 31 can be discharged smoothly without stagnation as in the prior art, and the control rod guide tube 41 becomes an effective discharging means for eliminating recriticality.
なお、原子炉容器の内部構造ならびに炉心の配置などは図５ならびに図７と同様であるので、それらの重複する説明は省略する。 The internal structure of the nuclear reactor vessel and the arrangement of the reactor core are the same as those shown in FIGS.
前記実施例では冷却材として液体金属ナトリウムを使用したが、水などの他の冷却材を使用することも可能である。 In the above embodiment, liquid metal sodium is used as the coolant, but other coolants such as water can also be used.
前記実施例では図２に示すように、ダッシュポット４５の周壁に、それの軸方向と直交する方向に延びた穴４８を形成したが、ダッシュポット４５の周壁に、それの軸方向に対して斜め上方向に延びた穴を形成することも可能である。 In the embodiment, as shown in FIG. 2, the hole 48 extending in the direction perpendicular to the axial direction of the dash pot 45 is formed in the peripheral wall of the dash pot 45. It is also possible to form a hole extending obliquely upward.
前記実施例では流路内構造物としてダッシュポット４５を用いたが、本発明はダッシュポットに限定されるものではなく、断面形状が略凹形の他の流路内構造物の周壁に肉薄部を設けることも可能である。 In the above embodiment, the dash pot 45 is used as the flow channel structure. However, the present invention is not limited to the dash pot, and the thin wall portion is formed on the peripheral wall of another flow channel structure having a substantially concave cross section. It is also possible to provide.
１１：液体金属ナトリウム、
１６：上部炉心支持板、
１７：下部炉心支持板、
１８：連絡管、
３１：溶融燃料（損傷炉心物質）、
４０：制御棒集合体、
４１：制御棒案内管、
４２：エントランスノズル、
４３：段部、
４４：排出筒部、
４５：ダッシュポット（緩衝器）、
４６：つば部、
４７：凹部、
４８：穴、
４９：隙間、
５０：下部、
５１：凹溝、
５２：肉薄部、
５４：落下、
Ｄ１：凹部の外径、
Ｄ２：段部の内径、
Ｄ３：底部の外径、
Ｄ４：排出筒部の内径。
11: Liquid metal sodium,
16: Upper core support plate,
17: Lower core support plate,
18: Connecting pipe,
31: Molten fuel (damaged core material),
40: Control rod assembly,
41: Control rod guide tube,
42: Entrance nozzle,
43: Step,
44: discharge cylinder part,
45: Dashpot (buffer),
46: collar part,
47: recess,
48: hole,
49: gap,
50: bottom,
51: groove,
52: Thin part,
54: Falling,
D1: outer diameter of the recess,
D2: inner diameter of the step,
D3: outer diameter of the bottom,
D4: inner diameter of the discharge cylinder.
Claims (6)
前記流路内構造物の略凹形を形成する凹部内に流入・堆積した溶融燃料の熱により昇温して溶断することのできる肉薄部を、前記凹部の周壁に当該凹部の周方向に沿って連続して設けたことを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor in which the structure in the flow path having a substantially concave cross section is housed inside
The thin portion that can be blown by more heated to the heat of the molten fuel flowing-deposited into the recess to form a substantially concave in the channel structure, the circumferential direction of the concave portion on the peripheral wall of the recess A control rod guide tube for a fast reactor, characterized by being provided continuously along.
前記肉薄部を前記凹部の底部近傍に設けたことを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor according to claim 1,
A control rod guide tube for a fast reactor, wherein the thin portion is provided near the bottom of the recess.
当該制御棒案内管の前記流路内構造物の収容位置より下方に、前記凹部の底部の外径Ｄ３より径大の内径Ｄ４を有する排出筒部が下方に向けて形成され、前記凹部の底部が排出筒部側に臨んでいることを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor according to claim 1 or 2,
A discharge cylinder portion having an inner diameter D4 larger than the outer diameter D3 of the bottom portion of the concave portion is formed downward from the accommodation position of the structure in the flow path of the control rod guide tube, and the bottom portion of the concave portion A control rod guide tube for a fast reactor, characterized by facing the discharge tube side.
当該制御棒案内管の内側途中に縮径されて内径Ｄ２の段部が形成され、前記段部の内径Ｄ２よりも小径の外径Ｄ１を有する前記流路内構造物の凹部を前記段部の内側に収容して、前記段部と前記凹部の間に隙間が形成され、前記隙間により当該制御棒案内管内を流通する冷却材の流量が調整されることを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor according to any one of claims 1 to 3,
The control rod guide tube is reduced in diameter in the middle to form a step portion having an inner diameter D2, and the recess in the flow passage structure having an outer diameter D1 smaller than the inner diameter D2 of the step portion is formed in the step portion. A control rod guide for a fast reactor characterized in that a clearance is formed between the step portion and the recess, and the flow rate of the coolant flowing through the control rod guide tube is adjusted by the clearance. tube.
前記冷却材が液体金属ナトリウムであることを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor according to claim 4 ,
A control rod guide tube for a fast reactor, wherein the coolant is liquid metal sodium.
前記流路内構造物がダッシュポットであることを特徴とする高速炉の制御棒案内管。 In the control rod guide tube of the fast reactor according to any one of claims 1 to 5,
A control rod guide tube for a fast reactor, wherein the flow passage structure is a dashpot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014264483A JP6434305B2 (en) | 2014-12-26 | 2014-12-26 | Control rod guide tube for fast reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014264483A JP6434305B2 (en) | 2014-12-26 | 2014-12-26 | Control rod guide tube for fast reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2016125837A JP2016125837A (en) | 2016-07-11 |
| JP6434305B2 true JP6434305B2 (en) | 2018-12-05 |
Family
ID=56356998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014264483A Active JP6434305B2 (en) | 2014-12-26 | 2014-12-26 | Control rod guide tube for fast reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6434305B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6808765B2 (en) * | 2019-01-09 | 2021-01-06 | 三菱Ｆｂｒシステムズ株式会社 | Control rod guide pipe for fast reactor |
| JP7200153B2 (en) * | 2020-01-31 | 2023-01-06 | 三菱Ｆｂｒシステムズ株式会社 | Molten fuel outflow tube of fast reactor and fast reactor |
| CN113342564B (en) | 2021-06-25 | 2023-12-12 | 阿波罗智联(北京)科技有限公司 | Log auditing method and device, electronic equipment and medium |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4462958A (en) * | 1982-04-30 | 1984-07-31 | The United States Of America As Represented By The United States Department Of Energy | LMFBR fuel assembly design for HCDA fuel dispersal |
| JPH06258473A (en) * | 1993-03-05 | 1994-09-16 | Mitsubishi Atom Power Ind Inc | Melting time output suppression type fuel element |
| JP2839222B2 (en) * | 1993-05-10 | 1998-12-16 | 核燃料サイクル開発機構 | Self-actuated furnace shutdown device for fast reactors |
| JPH07128469A (en) * | 1993-11-09 | 1995-05-19 | Tokyo Electric Power Co Inc:The | Core of fast reactor |
| JPH10227884A (en) * | 1997-02-17 | 1998-08-25 | Hitachi Ltd | Control rod assembly of fast reactor |
| JP2002055187A (en) * | 2000-08-09 | 2002-02-20 | Japan Nuclear Cycle Development Inst States Of Projects | Fuel assembly for fast reactor |
| JP3778438B2 (en) * | 2002-03-07 | 2006-05-24 | 東京電力株式会社 | Fuel assembly for fast breeder reactor |
| JP2006126147A (en) * | 2004-11-01 | 2006-05-18 | Japan Nuclear Cycle Development Inst States Of Projects | Core fuel assembly for liquid metal cooling fast reactor |
| JP2009085650A (en) * | 2007-09-28 | 2009-04-23 | Hitachi-Ge Nuclear Energy Ltd | Core component or fast reactor, core fuel assembly, core, and reactor structure |
| US8320513B2 (en) * | 2009-04-16 | 2012-11-27 | The Invention Science Fund I, Llc | Nuclear fission reactor, flow control assembly, methods therefor and a flow control assembly system |
-
2014
- 2014-12-26 JP JP2014264483A patent/JP6434305B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016125837A (en) | 2016-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6434305B2 (en) | Control rod guide tube for fast reactor | |
| TWI437578B (en) | Atomic furnace storage container drainage tank | |
| US20080013667A1 (en) | Lower and upper end plugs of an annular fuel rod | |
| GB2542442B (en) | Composite construction of nuclear reactor pressure vessel and barrier shield | |
| US11227695B2 (en) | Core catcher and boiling water nuclear plant using the same | |
| TW200847191A (en) | Bottom end-piece having an anti-debris device with a baffle for a nuclear fuel assembly and corresponding assembly | |
| JP2011174897A (en) | Molten material cooling structure, reactor containment vessel provided with cooling structure, and nuclear power plant provided with containment vessel | |
| KR101677357B1 (en) | Fuel bundle for a liquid metal cooled nuclear reactor | |
| JPH07140288A (en) | Column shielding body | |
| JP2010038571A (en) | Furnace-core melted product cooling device and furnace-core melted product cooling method | |
| JP5443199B2 (en) | Fast breeder reactor core structure | |
| JP2017146195A (en) | Reactor containment vessel and drain sump mechanism thereof | |
| JP6808765B2 (en) | Control rod guide pipe for fast reactor | |
| JP4301604B2 (en) | Pressurized water reactor | |
| JP7200153B2 (en) | Molten fuel outflow tube of fast reactor and fast reactor | |
| JPH10227884A (en) | Control rod assembly of fast reactor | |
| KR101085102B1 (en) | A lower end plug for annular fuel rod along with a function of inner coolant channel blockage prevention due to debris | |
| JP6101185B2 (en) | Reactor | |
| JPWO2013150750A1 (en) | Reactor pressure vessel penetration protection structure and reactor | |
| JP2017040588A (en) | Nuclear reactor facility | |
| JP2017090400A (en) | Nuclear reactor core catcher | |
| JP2014185920A (en) | Structure in nuclear reactor | |
| JP2017003443A (en) | Drain sump protection structure and containment vessel | |
| JP6590770B2 (en) | Core catcher | |
| JPH07104091A (en) | Vessel wall cooling structure for reactor vessel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20170912 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20180807 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20180831 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20181030 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20181108 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6434305 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |