JPH0836095A - Fuel storage container for carrying nuclear fuel body - Google Patents
Fuel storage container for carrying nuclear fuel bodyInfo
- Publication number
- JPH0836095A JPH0836095A JP6171204A JP17120494A JPH0836095A JP H0836095 A JPH0836095 A JP H0836095A JP 6171204 A JP6171204 A JP 6171204A JP 17120494 A JP17120494 A JP 17120494A JP H0836095 A JPH0836095 A JP H0836095A
- Authority
- JP
- Japan
- Prior art keywords
- nuclear fuel
- fuel
- transporting
- container
- storage container
- 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.)
- Granted
Links
Landscapes
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、原子燃料体を運搬する
ときに用いられる原子燃料体運搬用燃料収納容器に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel container for transporting a nuclear fuel body used for transporting the nuclear fuel body.
【０００２】[0002]
【従来の技術】周知のように、原子炉の炉心に装荷され
る燃料集合体は、流路箱と、この流路箱内に装着された
原子燃料体とで構成されている。原子燃料体、たとえば
ＢＷＲ型原子炉で用いられる原子燃料体は、通常、図８
(a) に示すよう、下部タイプレート１と上部タイプレー
ト２との間に燃料棒３を複数本平行に配置したものとな
っている。下部タイプレート１と上部タイプレート２に
は、各燃料棒３の端部を挿入させるための孔と、冷却材
を通流させるための孔とが規則正しく設けられている。
複数の燃料棒３のうちの何本かは、その下端部および上
端部が下部タイプレート１と上部タイプレート２にネジ
で固定されている。そして、中間部には燃料棒３間の隙
間を一定に保つためのスペーサ４が装着されている。2. Description of the Related Art As is well known, a fuel assembly loaded in a core of a nuclear reactor is composed of a flow path box and a nuclear fuel assembly mounted in the flow path box. Nuclear fuel bodies, such as those used in BWR reactors, are commonly found in FIG.
As shown in (a), a plurality of fuel rods 3 are arranged in parallel between the lower tie plate 1 and the upper tie plate 2. The lower tie plate 1 and the upper tie plate 2 are regularly provided with holes for inserting the ends of the fuel rods 3 and holes for allowing the coolant to flow therethrough.
The lower end and the upper end of some of the plurality of fuel rods 3 are fixed to the lower tie plate 1 and the upper tie plate 2 with screws. A spacer 4 is attached to the middle portion to keep the gap between the fuel rods 3 constant.
【０００３】下部タイプレート１は、前述した燃料棒３
の下端部支持に供される支持板６と、矩形状本体部と、
下端における筒状部５と、筒状部５から図８(b) に示す
ように三つ又状に突出した突出部（トリプルブリッジと
呼ばれている）７とで構成されている。The lower tie plate 1 is the fuel rod 3 described above.
A support plate 6 used to support the lower end of the
It is composed of a tubular portion 5 at the lower end and a projecting portion (called a triple bridge) 7 that projects from the tubular portion 5 in a three-pronged shape as shown in FIG. 8B.
【０００４】ところで、上記のような構造の原子燃料体
は、燃料製造工場で製造された後にたとえば発電所サイ
ト等に輸送される。この場合、原子燃料体は、図９に示
すような燃料収納容器１１に収納され、図示しない輸送
容器により輸送される。By the way, the nuclear fuel assembly having the above structure is manufactured in a fuel manufacturing plant and then transported to, for example, a power plant site. In this case, the nuclear fuel assembly is stored in the fuel storage container 11 as shown in FIG. 9 and transported by the transport container (not shown).
【０００５】この燃料収納容器１１は、内部に図８に示
した原子燃料体を収容し得る角柱状の収容空間を備え、
かつ図中Ａ位置より上方が実線矢印１２ａ，１２ｂで示
す方向に開くことができる両開き構造に形成されてい
る。そして、上壁外面にはクレーンによる吊上げ・吊下
げに供されるアイボルト１３が設けられている。また、
内底部には、四弗化エチレン等の軟質材で形成された支
持部材１４が装着されており、この支持部材１４の上面
部には図１０および図１１にも示すように、下部タイプ
レート１に設けられた突出部７を入り込ませるための溝
１５が形成されている。なお、支持部材１４を四弗化エ
チレン等の軟質材が形成するのは、金属である原子燃料
体が他の金属と接触することによって金属削り粉が発生
するのを避けるためである。The fuel storage container 11 has a prismatic storage space for storing the nuclear fuel body shown in FIG.
Further, the upper side of the position A in the drawing is formed in a double-opening structure that can be opened in the directions indicated by solid arrows 12a and 12b. An eyebolt 13 used for hoisting and hanging by a crane is provided on the outer surface of the upper wall. Also,
A support member 14 made of a soft material such as ethylene tetrafluoride is attached to the inner bottom portion, and an upper surface of the support member 14 has a lower tie plate 1 as shown in FIGS. 10 and 11. A groove 15 is formed to allow the protruding portion 7 provided at the bottom to enter. The supporting member 14 is formed of a soft material such as ethylene tetrafluoride in order to avoid generation of metal shavings due to contact of the nuclear fuel body, which is a metal, with another metal.
【０００６】このように構成された燃料収納容器１１を
使って原子燃料体を運搬するときには、下部タイプレー
ト１の突出部７が溝１５に入り込むように燃料収納容器
１１内に原子燃料体を収容し、この状態でアイボルト１
３を使ってクレーンによる吊上げ、吊下げを伴う作業が
行われる。When the fuel container 11 thus constructed is used to carry a nuclear fuel element, the fuel element 11 is accommodated in the fuel container 11 so that the protrusion 7 of the lower tie plate 1 fits into the groove 15. Then, in this state, eyebolt 1
Work involving lifting and hanging by a crane will be performed using 3.
【０００７】しかしながら、上記のように構成された原
子燃料体運搬用燃料収納容器にあっても次のような問題
があった。すなわち、先に説明したように、原子燃料体
は運搬用燃料収納容器に収容された状態で、たとえば燃
料製造工場から発電サイト受入先まで輸送される。この
間にクレーンよる吊上げ、吊下げ等のハンドリング作業
が行われる。したがって、仮想事故として、ハンドリン
グ作業時に、一定の高さまで吊上げられた燃料収納容器
１１が何等かの理由で落下し、床面等に衝突した場合を
想定しても、原子燃料体が破損しないことが望まれる。However, even the fuel container for transporting nuclear fuel bodies constructed as described above has the following problems. That is, as described above, the nuclear fuel assembly is transported, for example, from the fuel manufacturing plant to the power generation site receiving destination while being stored in the transportation fuel storage container. During this time, handling work such as hoisting and hanging by a crane is performed. Therefore, even if it is assumed that the fuel storage container 11 that has been lifted to a certain height falls for some reason and collides with the floor surface or the like during handling work as a virtual accident, the nuclear fuel body is not damaged. Is desired.
【０００８】しかし、従来の燃料収納容器では、運搬時
において金属同士が接触するのを避ける目的から内底部
に軟質材製の支持部材１４を設けているに過ぎないの
で、材質の面と受圧面積が小さいことの２点から、落下
衝突時における衝撃吸収能力が小さい問題があった。な
お、ここでいう受圧面積とは、原子燃料体から力を受け
ている面積であり、図１０においては筒状部５の下端面
面積がこれに相当する。勿論、原子燃料体自身にも衝撃
力に対するかなりの抵抗力はあるが、従来の燃料収納容
器１１では衝撃吸収能力が小さいため、仮想事故におい
て許容される落下高さをより高める効果が期待できない
問題があった。However, in the conventional fuel storage container, the support member 14 made of a soft material is merely provided on the inner bottom portion for the purpose of avoiding metal contact with each other during transportation. There is a problem in that the shock absorption capacity at the time of a drop collision is small because of two small points. The pressure receiving area here is an area receiving a force from the nuclear fuel body, and in FIG. 10, the lower end surface area of the tubular portion 5 corresponds to this. Of course, the nuclear fuel body itself has a considerable resistance to the impact force, but the conventional fuel storage container 11 has a small impact absorption capacity, so that it is not possible to expect the effect of further increasing the allowable drop height in a virtual accident. was there.
【０００９】[0009]
【発明が解決しようとする課題】上述の如く、従来の原
子燃料体運搬用燃料収納容器にあっては、クレーンよる
吊上げ、吊下げ等のハンドリング作業時に想定される落
下衝突時の衝撃吸収能力が小さい問題があった。そこで
本発明は、より高い落下高さの場合であっても原子燃料
体の健全性確保に寄与できる原子燃料体運搬用燃料収納
容器を提供することを目的としている。As described above, in the conventional fuel storage container for transporting nuclear fuel, the shock absorbing capacity at the time of a drop collision, which is expected during handling work such as lifting and hanging by a crane, is required. There was a small problem. Therefore, an object of the present invention is to provide a fuel storage container for transporting a nuclear fuel body that can contribute to ensuring the soundness of the nuclear fuel body even at a higher drop height.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る原子燃料体運搬用燃料収納容器は、原
子燃料体を収容する容器本体と、この容器本体内の底部
に設けられ、下部タイプレートを介して原子燃料体の荷
重を支持するとともに一定レベルを越える荷重が印加さ
れたときに少なくとも一部が塑性変形する衝撃吸収機構
とを備えている。In order to achieve the above object, a fuel storage container for transporting a nuclear fuel body according to the present invention is provided in a container body for storing a nuclear fuel body and a bottom portion in the container body. , A shock absorbing mechanism that supports the load of the nuclear fuel assembly via the lower tie plate and at least partially plastically deforms when a load exceeding a certain level is applied.
【００１１】なお、衝撃吸収機構は、少なくとも一部が
鉛材、金属ハニカム材、金属メッシュ材、中空金属球の
集合体、木材のいずれかで構成されていることが好まし
い。また、上記目的を達成するために、本発明に係る原
子燃料体運搬用燃料収納容器は、原子燃料体を収容する
上げ底構成の容器本体と、この容器本体内の底部に設け
られ、下部タイプレートを介して原子燃料体の荷重を支
持する支持部材とを備えている。At least a part of the shock absorbing mechanism is preferably made of a lead material, a metal honeycomb material, a metal mesh material, an aggregate of hollow metal spheres, or wood. Further, in order to achieve the above object, a fuel storage container for transporting a nuclear fuel body according to the present invention includes a container body having a raised bottom structure for storing a nuclear fuel body, and a bottom tie plate provided at the bottom of the container body. And a support member for supporting the load of the nuclear fuel assembly via the.
【００１２】[0012]
【作用】原子燃料体運搬用燃料収納容器に上記構成の衝
撃吸収機構を設けたことによって、落下高さが従来より
高い場合でも原子燃料体の健全性を確保できる。また、
原子燃料体運搬用燃料収納容器の容器本体を上げ底構成
に形成することによって、落下時に原子燃料体が有して
いる運動エネルギで容器本体の底壁を塑性変形させ、こ
れによって運動エネルギを消費させることができるの
で、やはり原子燃料体の健全性を確保できる。By providing the shock absorbing mechanism having the above-described structure in the fuel container for transporting the nuclear fuel body, the soundness of the nuclear fuel body can be ensured even when the drop height is higher than before. Also,
By forming the container body of the fuel accommodating container for transporting a nuclear fuel body into a raised bottom structure, the bottom wall of the container body is plastically deformed by the kinetic energy of the nuclear fuel body when it falls, thereby consuming the kinetic energy. Therefore, the integrity of the nuclear fuel assembly can be ensured.
【００１３】[0013]
【実施例】以下、図面を参照しながら実施例を説明す
る。図１には本発明の第１の実施例に係る原子燃料体運
搬用燃料収納容器の要部が示されている。なお、この図
では図１０と同一機能部分が同一符号で示されている。
したがって、重複する部分の詳しい説明は省略する。Embodiments will be described below with reference to the drawings. FIG. 1 shows an essential part of a fuel storage container for transporting a nuclear fuel assembly according to a first embodiment of the present invention. In this figure, the same functional parts as those in FIG. 10 are shown by the same reference numerals.
Therefore, detailed description of the overlapping portions will be omitted.
【００１４】この実施例に係る原子燃料体運搬用燃料収
納容器が従来の容器と異なる点は、容器本体の内底部に
衝撃吸収機構を設けたことにある。すなわち、図中Ｐは
図８に示した原子燃料体を示し、１１ａは原子燃料体運
搬用燃料収納容器を示し、２２は容器本体を示し、２３
は容器本体２２の側壁を示し、２４は容器本体２２の底
壁を示している。これらはいずれも金属材で形成されて
いる。そして、容器本体２２の内底部に衝撃吸収機構２
５が設けられている。The fuel container for transporting nuclear fuel according to this embodiment is different from the conventional container in that a shock absorbing mechanism is provided at the inner bottom of the container body. That is, in the figure, P indicates the nuclear fuel body shown in FIG. 8, 11a indicates a fuel storage container for transporting the nuclear fuel body, 22 indicates a container body, and 23
Indicates the side wall of the container body 22, and 24 indicates the bottom wall of the container body 22. Each of these is made of a metal material. The shock absorbing mechanism 2 is attached to the inner bottom of the container body 22.
5 are provided.
【００１５】衝撃吸収機構２５は、底壁２４の上面に配
置された衝撃吸収部材３１と、この衝撃吸収部材３１の
上面に配置されたリング状の金属板３２と、この金属板
３２の上面に配置されたリング状のスペーサ３３とで構
成されている。The shock absorbing mechanism 25 includes a shock absorbing member 31 arranged on the upper surface of the bottom wall 24, a ring-shaped metal plate 32 arranged on the upper surface of the shock absorbing member 31, and an upper surface of the metal plate 32. It is composed of a ring-shaped spacer 33 arranged.
【００１６】衝撃吸収部材３１は、木材，鉛材，金属ハ
ニカム材，金属メッシュ材のように、一定レベル以上の
荷重が印加されたときに塑性変形する部材で底壁２４の
上面を覆う角ブロック状に形成されている。なお、木材
は一定レベル以上の荷重が印加されると圧潰するが、こ
の圧潰も塑性変形とみなすことができる。この衝撃吸収
部材３１の上面には原子燃料体Ｐの下部タイプレート１
における筒状部５の下端部外径より大きい内径の円柱状
凹部３４が形成されている。そして、円柱状凹部３４の
いわゆる底面には、図２(a) にも示すように、下部タイ
プレート１に設けられた三つ又状の突出部７を入り込ま
せるための溝３５が形成されている。The impact absorbing member 31 is a square block that covers the upper surface of the bottom wall 24 with a member that plastically deforms when a load of a certain level or more is applied, such as wood, lead material, metal honeycomb material, and metal mesh material. It is formed into a shape. It should be noted that wood is crushed when a load of a certain level or more is applied, but this crushing can also be regarded as plastic deformation. On the upper surface of the shock absorbing member 31, the lower tie plate 1 of the nuclear fuel assembly P
A cylindrical recess 34 having an inner diameter larger than the outer diameter of the lower end of the tubular portion 5 is formed. As shown in FIG. 2A, a groove 35 is formed in the so-called bottom surface of the cylindrical recess 34 to allow the three-pronged protrusion 7 provided in the lower tie plate 1 to enter.
【００１７】金属板３２は、外径が円柱状凹部３４の内
径とほぼ等しく、内径が下部タイプレート１における筒
状部５の下端部内径より所定だけ小さく、かつ周縁部に
円柱状凹部３４の深さとほぼ等しい高さの突周壁３６を
備え、さらに図２(b) に示すように、前記溝３５に対応
する部分に切込み３７を備えたものとなっている。The metal plate 32 has an outer diameter substantially equal to the inner diameter of the cylindrical recess 34, an inner diameter smaller than the inner diameter of the lower end of the tubular portion 5 of the lower tie plate 1 by a predetermined amount, and a cylindrical recess 34 at the peripheral edge. The projection wall 36 has a height almost equal to the depth, and further, as shown in FIG. 2B, a notch 37 is provided at a portion corresponding to the groove 35.
【００１８】一方、スペーサ３３は、四弗化エチレンな
どの薄い軟質材で、内径が金属板３２の内径とほぼ等し
く、かつ下部タイプレート１における筒状部５の下端部
と金属板３２との直接接触を防止し得る形状に形成され
ている。On the other hand, the spacer 33 is a thin soft material such as ethylene tetrafluoride and has an inner diameter substantially equal to the inner diameter of the metal plate 32, and the lower end of the tubular portion 5 of the lower tie plate 1 and the metal plate 32. It is formed in a shape that can prevent direct contact.
【００１９】このように構成された、原子燃料体運搬用
燃料収納容器１１ａを使って原子燃料体Ｐを運搬すると
きには、図１に示すように下部タイプレート１の突出部
７が溝３５に入り込むように燃料収納容器１１ａ内に原
子燃料体Ｐを収容し、この状態で図示しないアイボルト
を使ってクレーンによる吊上げ、吊下げを伴いながら運
搬作業が行われる。このとき、衝撃吸収部材３１は変形
することがなく、単なる支持部材としての機能を発揮す
る。When the fuel container P for transporting a nuclear fuel body constructed as described above is used to transport a nuclear fuel body P, the protrusion 7 of the lower tie plate 1 is inserted into the groove 35 as shown in FIG. As described above, the nuclear fuel assembly P is stored in the fuel storage container 11a, and in this state, the carrying operation is performed while the hoisting and hanging are performed by the crane using the eyebolts (not shown). At this time, the shock absorbing member 31 does not deform, and functions as a simple supporting member.
【００２０】クレーンによる吊上げ、吊下げ作業時に落
下事故が起こると、まず容器本体２２の底壁２４が床面
に衝突する。続いて、スペーサ３３の強度が小さいた
め、下部タイプレート１の下端部が沈み込んで金属板３
２に衝突し、金属板３２を介して下部タイプイレート１
が衝撃吸収部材３１を圧縮し続ける。このときの衝撃吸
収部材３１の塑性変形により、原子燃料体Ｐが衝突直前
に有していた運動エネルギが吸収される。When a drop accident occurs during lifting or hanging work by a crane, the bottom wall 24 of the container body 22 first collides with the floor surface. Then, since the strength of the spacer 33 is small, the lower end portion of the lower tie plate 1 sinks and the metal plate 3
2 and collide with the lower plate 11 through the metal plate 32.
Keeps compressing the shock absorbing member 31. The plastic deformation of the shock absorbing member 31 at this time absorbs the kinetic energy that the nuclear fuel body P had immediately before the collision.
【００２１】すなわち、原子燃料体Ｐの運動エネルギ
は、落下高さに比例する。たとえばＢＷＲ型原子炉で用
いられる原子燃料体Ｐの場合、長さが約4mで、重さが約
270kgであるため、落下高さ1m当り、約2.7kJ の運動エ
ネルギを有する。このオーダの運動エネルギを吸収する
ための衝撃吸収部材としては、弾性体は不適である。本
実施例のように、衝撃吸収部材３１として木材を使用し
た場合には、その圧潰抵抗力によって、また衝撃吸収部
材３１として金属材を用いた場合には金属の塑性変形に
よって運動エネルギを吸収できる。That is, the kinetic energy of the nuclear fuel assembly P is proportional to the drop height. For example, in the case of a nuclear fuel assembly P used in a BWR reactor, the length is about 4 m and the weight is about 4 m.
Since it is 270 kg, it has a kinetic energy of about 2.7 kJ per drop height of 1 m. An elastic body is not suitable as a shock absorbing member for absorbing this order of kinetic energy. When wood is used as the shock absorbing member 31 as in the present embodiment, kinetic energy can be absorbed by the crush resistance force, and when a metal material is used as the shock absorbing member 31, plastic deformation of metal can absorb the kinetic energy. .
【００２２】したがって、落下高さが従来に比較して格
段に高い場合でも原子燃料体Ｐの健全性が保たれること
になる。なお、この実施例の場合には、金属板３２をリ
ング状とし、その周囲に突周壁３６を設けているので、
下部タイプレート１の筒状部５と金属板３２との横ずれ
を防止することができる。また、衝撃吸収部材３１の材
質に応じて金属板３２の内径および外径を変えることに
よって衝撃吸収部材３１が受ける受圧面積を任意に変え
ることができる。Therefore, the soundness of the nuclear fuel assembly P can be maintained even when the drop height is much higher than in the conventional case. In the case of this embodiment, since the metal plate 32 has a ring shape and the protruding peripheral wall 36 is provided around the metal plate 32,
It is possible to prevent lateral displacement between the tubular portion 5 of the lower tie plate 1 and the metal plate 32. Further, the pressure receiving area received by the shock absorbing member 31 can be arbitrarily changed by changing the inner diameter and the outer diameter of the metal plate 32 depending on the material of the shock absorbing member 31.
【００２３】図３には本発明の第２の実施例に係る原子
燃料体運搬用燃料収納容器１１ｂの要部が示されてい
る。なお、この図では図１と同一機能部分が同一符号で
示されている。したがって、重複する部分の詳しい説明
は省略する。FIG. 3 shows an essential part of a fuel storage container 11b for transporting a nuclear fuel assembly according to a second embodiment of the present invention. In this figure, the same functional parts as those in FIG. 1 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.
【００２４】この実施例に係る原子燃料体運搬用燃料収
納容器１１ｂでは、衝撃吸収部材３１、金属板３２およ
び軟質材製の薄いスペーサ３３を下部タイプレート１に
おける筒状部５の周囲まで延出させている。In the fuel storage container 11b for transporting nuclear fuel bodies according to this embodiment, the shock absorbing member 31, the metal plate 32 and the thin spacer 33 made of a soft material are extended to the periphery of the cylindrical portion 5 in the lower tie plate 1. I am letting you.
【００２５】このように構成された原子燃料体運搬用燃
料収納容器１１ｂにおいては、図１に示す実施例と同様
の効果が得られるほか、圧縮された衝撃吸収部材３１が
外周方向に膨らむことにより、容器本体２２の側壁２３
を塑性変形させるので、エネルギ吸収効率をさらに向上
させることができる。In the fuel container 11b for transporting the nuclear fuel body constructed as described above, the same effect as that of the embodiment shown in FIG. 1 is obtained, and the compressed shock absorbing member 31 expands in the outer peripheral direction. , The side wall 23 of the container body 22
Since the is plastically deformed, the energy absorption efficiency can be further improved.
【００２６】図４には本発明の第３の実施例に係る原子
燃料体運搬用燃料収納容器１１ｃの要部が示されてい
る。なお、この図では図１および図１０と同一機能部分
が同一符号で示されている。したがって、重複する部分
の詳しい説明は省略する。FIG. 4 shows a main part of a fuel storage container 11c for transporting a nuclear fuel body according to a third embodiment of the present invention. In this figure, the same functional portions as those in FIGS. 1 and 10 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.
【００２７】この実施例に係る原子燃料体運搬用燃料収
納容器１１ｃは、従来から用いられている軟質材製の支
持部材１４の下方に金属板４１と衝撃吸収部材４２とを
組合せた衝撃吸収機構２５ｂを設けたものとなってい
る。The fuel storage container 11c for transporting a nuclear fuel body according to this embodiment has a shock absorbing mechanism in which a metal plate 41 and a shock absorbing member 42 are combined below a conventionally used support member 14 made of a soft material. 25b is provided.
【００２８】衝撃吸収部材４２としては、安価である点
で緩衝用木材や鉛材が適しているが、金属ハニカム材、
金属メッシュ材あるいは小さな中空金属球を多数まとめ
たものなどのように、一定レベル以上の荷重が印加され
たときに塑性変形するものが用いられている。As the shock absorbing member 42, cushioning wood or lead material is suitable because it is inexpensive, but metal honeycomb material,
A material that plastically deforms when a load of a certain level or more is applied, such as a metal mesh material or a large number of small hollow metal spheres, is used.
【００２９】このように構成された原子燃料体運搬用燃
料収納容器１１ｃにあっても、図１および図３に示すも
のと同様の原理で原子燃料体Ｐが衝突直前に有していた
運動エネルギを衝撃吸収機構２５ｂで吸収させることが
でき、落下高さが従来に比較して格段に高い場合でも原
子燃料体Ｐの健全性確保に寄与できる。Even in the fuel container 11c for transporting the nuclear fuel body constructed as described above, the kinetic energy possessed by the nuclear fuel body P immediately before the collision is held on the same principle as that shown in FIGS. 1 and 3. Can be absorbed by the shock absorbing mechanism 25b, and it is possible to contribute to ensuring the soundness of the nuclear fuel assembly P even when the drop height is significantly higher than in the past.
【００３０】図５には本発明の第４の実施例に係る原子
燃料体運搬用燃料収納容器１１ｄの要部が示されてい
る。なお、この図では図１０と同一機能部分が同一符号
で示されている。したがって、重複する部分の詳しい説
明は省略する。FIG. 5 shows an essential part of a fuel container 11d for transporting nuclear fuel bodies according to a fourth embodiment of the present invention. In this figure, the same functional parts as those in FIG. 10 are shown by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.
【００３１】この実施例に係る原子燃料体運搬用燃料収
納容器１１ｄでは、容器本体２２の内底部に従来から用
いられている軟質材製の支持部材１４を配置するととも
に、図６にも示すように、容器本体２２の底壁２４の周
縁部にあたかも側壁２３を延長させる如く枠体５１を接
続し、この枠体５１によって底壁２４を実質的に20mm以
上の上げ底構成としている。In the fuel storage container 11d for transporting nuclear fuel bodies according to this embodiment, a conventionally used soft material supporting member 14 is arranged on the inner bottom portion of the container body 22, and as shown in FIG. Further, a frame 51 is connected to the peripheral portion of the bottom wall 24 of the container body 22 so as to extend the side wall 23, and the bottom wall 24 has a raised bottom structure of substantially 20 mm or more by the frame 51.
【００３２】この実施例に係る原子燃料体運搬用燃料収
納容器１１ｄでは、落下事故時、まず枠体５１の最下端
が床等に衝突し、続いて前述したように、下部タイプレ
ート１の三つ又状の突出部７が底壁２４に衝突して圧壊
し、さらに下部タイプレート１の筒状部５の最下端部が
底壁２４と衝突する。これらの過程を通して底壁２４自
身の塑性変形によって運動エネルギの吸収が行われる。In the fuel storage container 11d for transporting nuclear fuel bodies according to this embodiment, at the time of a drop accident, first, the lowermost end of the frame body 51 collides with the floor, etc. The projecting portions 7 collide with the bottom wall 24 and are crushed, and the lowermost end of the tubular portion 5 of the lower tie plate 1 collides with the bottom wall 24. Through these processes, the kinetic energy is absorbed by the plastic deformation of the bottom wall 24 itself.
【００３３】なお、枠体５１の高さを20mm以上とした理
由は、前述のように、落下高さ1m当りの原子燃料体Ｐの
運動エネルギがは約2.7 kJであり、このオーダの運動エ
ネルギを底壁２４自身の塑性変形で吸収するためには20
mm以上の空間が不可欠であることによる。The reason why the height of the frame body 51 is set to 20 mm or more is that the kinetic energy of the nuclear fuel body P per drop height of 1 m is about 2.7 kJ, as described above. 20 to absorb the plastic deformation of the bottom wall 24 itself.
Because a space of mm or more is indispensable.
【００３４】本実施例に係る原子燃料体運搬用燃料収納
容器１１ｄは、前述の金属板と衝撃吸収部材とを組合せ
た衝撃吸収機構を備えた原子燃料体用運搬容器に比較し
てエネルギ吸収能力にやや劣るものの、既存のものに簡
単な加工を施すだけで実現できるため経済的に有利であ
る。The fuel storage container 11d for transporting a nuclear fuel body according to the present embodiment has an energy absorbing capacity as compared with a transport container for a nuclear fuel body equipped with a shock absorbing mechanism in which a metal plate and a shock absorbing member are combined. Although a little inferior, it is economically advantageous because it can be realized by simply performing a simple process on an existing one.
【００３５】なお、図７に示すように、容器本体２３に
おける底壁２４の外面四隅に脚５２を設け、この脚５２
の塑性変形による運動エネルギ吸収機能および上げ底構
成に伴う底壁２４の塑性変形による運動エネルギ吸収機
能を利用してもよいし、また図示しないが容器本体２３
の底壁を20mm以上離れた二重底構成にしても上記実施例
と同様の効果を発揮させることができる。As shown in FIG. 7, legs 52 are provided at the four corners of the outer surface of the bottom wall 24 of the container body 23.
The kinetic energy absorption function due to plastic deformation of the container and the kinetic energy absorption function due to plastic deformation of the bottom wall 24 due to the raised bottom structure may be utilized, and although not shown, the container body 23
Even if the bottom wall of the above is a double bottom structure with a distance of 20 mm or more, the same effect as in the above embodiment can be exhibited.
【００３６】[0036]
【発明の効果】以上説明したように、本発明によれば、
仮想落下事故時における落下高さがより高い場合でも原
子燃料体の健全性維持に寄与できる。As described above, according to the present invention,
Even if the drop height is higher at the time of a virtual drop accident, it can contribute to maintaining the soundness of the nuclear fuel assembly.
【図１】本発明の第１の実施例に係る原子燃料体運搬用
燃料収納容器の要部断面図FIG. 1 is a sectional view of an essential part of a fuel storage container for transporting a nuclear fuel assembly according to a first embodiment of the present invention.
【図２】同容器に組込まれた衝撃吸収部材および金属板
の平面図FIG. 2 is a plan view of a shock absorbing member and a metal plate incorporated in the container.
【図３】本発明の第２の実施例に係る原子燃料体運搬用
燃料収納容器の要部断面図FIG. 3 is a cross-sectional view of essential parts of a fuel storage container for transporting a nuclear fuel assembly according to a second embodiment of the present invention.
【図４】本発明の第３の実施例に係る原子燃料体運搬用
燃料収納容器の要部断面図FIG. 4 is a cross-sectional view of essential parts of a fuel storage container for transporting a nuclear fuel assembly according to a third embodiment of the present invention.
【図５】本発明の第４の実施例に係る原子燃料体運搬用
燃料収納容器の要部断面図FIG. 5 is a cross-sectional view of essential parts of a fuel storage container for transporting a nuclear fuel assembly according to a fourth embodiment of the present invention.
【図６】同容器の底部外観図FIG. 6 is a bottom view of the container.
【図７】第４の実施例の変形例を説明するための底部外
観図FIG. 7 is a bottom external view for explaining a modification of the fourth embodiment.
【図８】(a) はＢＷＲ型原子炉で使用される原子燃料体
を一部切欠して示す側面図で、(b) は同原子燃料体の下
面図FIG. 8 (a) is a side view showing a nuclear fuel body used in a BWR reactor partially cut away, and FIG. 8 (b) is a bottom view of the nuclear fuel body.
【図９】従来の原子燃料体運搬用燃料収納容器を一部切
欠して示す斜視図FIG. 9 is a perspective view showing a conventional fuel storage container for transporting a nuclear fuel body with a part thereof cut away.
【図１０】同原子燃料体運搬用燃料収納容器に原子燃料
体を収容したときの下部断面図FIG. 10 is a bottom cross-sectional view of the nuclear fuel assembly containing the nuclear fuel assembly for transporting the nuclear fuel assembly.
【図１１】同原子燃料体運搬用燃料収納容器に組込まれ
た支持部材の平面図FIG. 11 is a plan view of a supporting member incorporated in the fuel storage container for transporting the nuclear fuel assembly.
Ｐ…原子燃料体 １…下部タイプ
レート ２…上部タイプレート ３…燃料棒 ４…スペーサ ５…筒状部 ６…支持板 ７…突出部 １１，１１ａ，１１ｂ，１１ｃ，１１ｄ…原子燃料体運
搬用燃料収納容器 １３…アイボルト １４…軟質材製
の支持材 １５…溝 ２２…容器本体 ２３…側壁 ２４…底壁 ２５，２５ａ，２５ｂ…衝撃吸収機構 ３１…衝撃吸収
部材 ３２…金属板 ３３…スペーサ ３４…円柱状凹部 ３５…溝 ３６…突周壁 ３７…切込み ４１…金属板 ４２…衝撃吸収
部材 ５１…枠体 ５２…脚P ... Nuclear fuel body 1 ... Lower tie plate 2 ... Upper tie plate 3 ... Fuel rod 4 ... Spacer 5 ... Cylindrical portion 6 ... Support plate 7 ... Projection portion 11, 11a, 11b, 11c, 11d ... For transporting nuclear fuel body Fuel container 13 ... Eyebolt 14 ... Support material made of soft material 15 ... Groove 22 ... Container body 23 ... Side wall 24 ... Bottom wall 25, 25a, 25b ... Impact absorbing mechanism 31 ... Impact absorbing member 32 ... Metal plate 33 ... Spacer 34 ... Cylindrical recess 35 ... Groove 36 ... Projection peripheral wall 37 ... Notch 41 ... Metal plate 42 ... Impact absorbing member 51 ... Frame 52 ... Leg
Claims (3)
間に複数本の燃料棒を配置してなる原子燃料体を運搬す
るときに用いられる原子燃料体運搬用燃料収納容器にお
いて、前記原子燃料体を収容する容器本体と、この容器
本体内の底部に設けられ、前記下部タイプレートを介し
て前記原子燃料体の荷重を支持するとともに一定レベル
を越える荷重が印加されたときに少なくとも一部が塑性
変形する衝撃吸収機構とを具備してなることを特徴とす
る原子燃料体運搬用燃料収納容器。1. A fuel storage container for transporting a nuclear fuel body used for transporting a nuclear fuel body, comprising a plurality of fuel rods arranged between a lower tie plate and an upper tie plate, wherein the nuclear fuel body is used. And a container main body for accommodating the fuel, which is provided at the bottom of the container main body, supports the load of the nuclear fuel assembly through the lower tie plate, and at least partly has plasticity when a load exceeding a certain level is applied. A fuel storage container for transporting a nuclear fuel body, comprising a deformable shock absorbing mechanism.
材、金属ハニカム材、金属メッシュ材、中空金属の集合
体、木材のいずれかで構成されていることを特徴とする
請求項１に記載の原子燃料体運搬用燃料収納容器。2. The shock absorbing mechanism is at least partially made of a lead material, a metal honeycomb material, a metal mesh material, an aggregate of hollow metals, or wood. A fuel storage container for transporting the nuclear fuel body described.
間に複数本の燃料棒を配置してなる原子燃料体を運搬す
るときに用いられる原子燃料体運搬用燃料収納容器にお
いて、前記原子燃料体を収容する上げ底構成の容器本体
と、この容器本体内の底部に設けられ、前記下部タイプ
レートを介して前記原子燃料体の荷重を支持する支持部
材とを具備してなることを特徴とする原子燃料体運搬用
燃料収納容器。3. A fuel container for transporting a nuclear fuel body used for transporting a nuclear fuel body, comprising a plurality of fuel rods arranged between a lower tie plate and an upper tie plate, wherein the nuclear fuel body is used. Atom comprising a container body having a raised bottom structure for accommodating and a support member which is provided at a bottom portion of the container body and supports a load of the atomic fuel body through the lower tie plate. Fuel storage container for transporting fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17120494A JP3516990B2 (en) | 1994-07-22 | 1994-07-22 | Fuel container for transporting nuclear fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17120494A JP3516990B2 (en) | 1994-07-22 | 1994-07-22 | Fuel container for transporting nuclear fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0836095A true JPH0836095A (en) | 1996-02-06 |
| JP3516990B2 JP3516990B2 (en) | 2004-04-05 |
Family
ID=15918959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17120494A Expired - Fee Related JP3516990B2 (en) | 1994-07-22 | 1994-07-22 | Fuel container for transporting nuclear fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3516990B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6128360A (en) * | 1997-03-05 | 2000-10-03 | Kabushiki Kaisha Toshiba | Fuel protective apparatus, fuel transport container and method of transporting a fuel assembly |
| JP2010127866A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Shock absorbing device of fuel assembly, and fuel assembly storage container |
| JP2011013034A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Shock absorber for fuel assembly and container for accommodating the same |
| JP2011013035A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Shock absorber for fuel assembly, and container for accommodating the same |
| JP2011033499A (en) * | 2009-08-03 | 2011-02-17 | Mitsubishi Heavy Ind Ltd | Fuel assembly container |
| JP2011047670A (en) * | 2009-08-25 | 2011-03-10 | Mitsubishi Heavy Ind Ltd | Shock absorber and storage cask of fuel assembly |
| DE102014118344B3 (en) * | 2014-12-10 | 2016-02-18 | Areva Gmbh | Shock absorbers for transport and / or storage containers for fuel assemblies and / or fuel-containing containers and fuel assemblies and / or fuel-containing containers as well as transport and / or storage containers for fuel assemblies and / or fuel-containing containers |
| RU2626762C1 (en) * | 2016-06-20 | 2017-08-01 | Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") | Vial top for worked rbmk-1000 reactor fuel assembly |
| RU2670104C1 (en) * | 2017-12-18 | 2018-10-18 | Акционерное общество "Центральное конструкторское бюро машиностроения" (АО "ЦКБМ") | Ampoule for spent fuel assembly |
| RU2729599C1 (en) * | 2019-12-27 | 2020-08-11 | Акционерное общество "Центральное конструкторское бюро машиностроения" (АО "ЦКБМ") | Capsule for transportation and storage of used absorbing rods of control and protection system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6128360A (en) * | 1997-03-05 | 2000-10-03 | Kabushiki Kaisha Toshiba | Fuel protective apparatus, fuel transport container and method of transporting a fuel assembly |
| JP2010127866A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Shock absorbing device of fuel assembly, and fuel assembly storage container |
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| JP2011013034A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Shock absorber for fuel assembly and container for accommodating the same |
| JP2011013035A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Shock absorber for fuel assembly, and container for accommodating the same |
| JP2011033499A (en) * | 2009-08-03 | 2011-02-17 | Mitsubishi Heavy Ind Ltd | Fuel assembly container |
| JP2011047670A (en) * | 2009-08-25 | 2011-03-10 | Mitsubishi Heavy Ind Ltd | Shock absorber and storage cask of fuel assembly |
| DE102014118344B3 (en) * | 2014-12-10 | 2016-02-18 | Areva Gmbh | Shock absorbers for transport and / or storage containers for fuel assemblies and / or fuel-containing containers and fuel assemblies and / or fuel-containing containers as well as transport and / or storage containers for fuel assemblies and / or fuel-containing containers |
| WO2016091793A1 (en) * | 2014-12-10 | 2016-06-16 | Areva Gmbh | Shock absorber for transport containers and/or storage containers for fuel elements and/or fuel-containing vessels, fuel element and/or fuel-containing vessel, and transport containers and/or storage containers for fuel elements and/or fuel-containing vessels |
| RU2626762C1 (en) * | 2016-06-20 | 2017-08-01 | Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") | Vial top for worked rbmk-1000 reactor fuel assembly |
| RU2670104C1 (en) * | 2017-12-18 | 2018-10-18 | Акционерное общество "Центральное конструкторское бюро машиностроения" (АО "ЦКБМ") | Ampoule for spent fuel assembly |
| RU2729599C1 (en) * | 2019-12-27 | 2020-08-11 | Акционерное общество "Центральное конструкторское бюро машиностроения" (АО "ЦКБМ") | Capsule for transportation and storage of used absorbing rods of control and protection system |
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| Publication number | Publication date |
|---|---|
| JP3516990B2 (en) | 2004-04-05 |
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