JP2006292629A - Resin filling apparatus and method for cask - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously fill a cask with a resin for the cask and drastically reduce working time for filling with the resin. <P>SOLUTION: A resin filling apparatus for a cask comprises: a tank 13 for storing a liquid 12 containing a primary agent comprising an epoxy resin; a neutron absorber and a fire retardant; a tank 17 for storing a liquid 16 containing a hardener for hardening the primary agent; injection systems 20, 21 for continuously injecting the individual liquids stored in the tanks from the tanks into the cask 1; and a static mixer 33 disposed in an injection path of the injection systems to the cask 1 for mixing the liquids. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a filling apparatus and filling method for a cask resin for filling a neutron shielding resin in a container (hereinafter referred to as “cask”) for transporting, storing, or transporting and storing spent fuel in a nuclear power plant. .

  4 and 5 illustrate a spent fuel transportation / storage cask 1 as a cask to be filled with a resin. 4 is a longitudinal sectional view of the cask 1, and FIG. 5 is a transverse sectional view (a sectional view taken along line AA in FIG. 4).

  The cask 1 has a bottomed vertical cylindrical cask main body 1a with an open upper end, and a primary lid 2 and a secondary lid 3 that seal the upper end opening of the cask main body 1a. The body 4 is stored via the basket 5. A plurality of trunnions 5 for handling cask conveyance and the like are provided on the outer peripheral portion of the cask body 1a.

  In the cask 1 having such a configuration, the outer surface side of the bottom wall portion and the peripheral wall portion of the cask main body 1a and the outer surface side of the secondary lid 3 are surrounded by an outer shell wall 6 that covers substantially the whole with a predetermined interval. . A space covering substantially the entire cask 1 formed by the outer shell wall 6 is a resin filling space, and the resin 7 is filled in this space.

  The resin 7 is configured by adding a curing agent to, for example, an epoxy resin, a neutron absorber, a flame retardant, and the like, which are main ingredients, and is filled in the space portion of the cask 1 and solidified.

  By the way, conventionally, when this resin is filled in each space part of the cask, the resin main agent, a curing agent, and a filler such as a neutron absorber and a flame retardant are mixed using a rotary blade, and the mixture is immediately mixed. A method of filling the cask 1 has been taken. However, in this method, the work of making a limited amount of liquid mixture that can be filled before the liquid mixture is cured and immediately performing the filling operation is repeated many times until all the filling is completed. There was a need.

In addition, a technique has been proposed in which the resin mixture is cooled to reduce the reaction rate and the curing time is delayed so that the filling can be performed for as long a time as possible (for example, see Patent Document 1). .
JP 2001-116885 A

  As described above, in the conventional resin filling method, because the amount of the liquid mixture to be prepared at a time is limited due to the restriction due to the curing time of the resin, the number of times of preparing the liquid mixture increases, and the filling work is delayed each time. There is a problem that the time required for filling all the resin becomes longer.

  In addition, even when measures are taken to delay the curing time by cooling, for example, there is no change to the time until curing and this is not a decisive measure. There is also a problem that an extra device such as a cooling device is required.

  The present invention has been made in order to solve the above-described problems, and is capable of filling a resin into a cask continuously and can greatly reduce the work time for resin filling and a cask resin filling device. It aims to provide a method.

  In order to achieve the above object, the invention according to claim 1 contains a tank containing a liquid containing an epoxy resin main agent, a neutron absorber and a flame retardant, and a liquid containing a curing agent for curing the main agent. Other tanks, an injection mechanism for continuously injecting the liquid stored in each of these tanks from each tank toward the cask, and an injection path to the cask by the injection mechanism. A cask resin filling device comprising a static mixer for mixing is provided.

  In the invention according to claim 2, the injection mechanism provides a cask resin filling device including a plurality of pistons and cylinders for extruding liquid from the tank, and a drive unit for driving the pistons.

  The invention according to claim 3 is a method of filling the cask with the resin using the cask resin filling device, wherein the liquid is obtained by mixing the main agent, the neutron absorber, and the flame retardant in advance. And at least two liquids prepared by mixing a neutron absorbent and a flame retardant in a curing agent for curing the coverage, and extruding each liquid by the injection mechanism and passing each static liquid through the static mixer. A cask resin filling method is provided, wherein the cask is continuously filled after mixing.

  According to a fourth aspect of the present invention, there is provided a method for filling a cask resin in which the particle size and composition of the constituents of each liquid are blended and adjusted in advance so that the viscosity is compatible with the injection mechanism and the static mixer.

  In the invention which concerns on Claim 5, the said each liquid provides the filling method of the resin for casks which adjusts temperature so that it may adapt to the mixing operation | work by the said static mixer.

  In the invention according to claim 6, the composition of the main agent and the curing agent is a cask resin filling method in which the composition is adjusted in advance so that curing is performed in a time suitable for the resin filling operation after mixing by the static mixer. provide.

  According to the present invention, each liquid is injected from a tank containing a liquid containing an epoxy resin main agent, a neutron absorber and a flame retardant, and another tank containing a liquid containing a curing agent for curing the main agent. By continuously injecting into the cask side, placing a static mixer in the injection path to the cask, and mixing the liquids, the resin is continuously filled into the cask, and the work time for resin filling is reduced. It can be greatly shortened.

  Embodiments of a cask resin filling apparatus and filling method according to the present invention will be described below with reference to FIGS. FIG. 1 is an overall configuration diagram showing a cask resin filling device 11. FIG. 2 is an enlarged cross-sectional view showing a main part of the static mixer. FIG. 3 is an enlarged cross-sectional view showing the internal elements of the static mixer further enlarged. In the following example, a case where two liquids are mixed as a resin will be described. For the cask 1 filled with the resin, refer to the configurations shown in FIGS. 4 and 5.

  First, the overall configuration of the resin filling device 11 will be described with reference to FIG. The filling apparatus 11 of this embodiment is provided with the 1st tank 13 which accommodates the 1st liquid 12 containing the main ingredient which consists of an epoxy resin, a neutron absorber, and a flame retardant. The first tank 13 has, for example, a vertically long cylindrical shape, and has a funnel-like configuration in which the lower end side has an inverted conical shape that gradually decreases in diameter toward the lower side, and the lower end side has a constant small diameter pipe portion. A lid 14 on a flat disk is attached to the upper end opening of the first tank 13, and a plurality of peripheral portions of the lid 14 are locked by a clip-shaped locking tool 15 so as to be opened and closed. ing.

  In addition, a second tank 17 for storing another liquid, that is, the second liquid 16 is provided adjacent to the first tank 13. The 2nd liquid contains the hardening | curing agent which hardens a main ingredient, and is specifically set as the structure containing a neutron absorber and a flame retardant with a hardening | curing agent. Similar to the first tank 12, the second tank 15 has a vertically long cylindrical shape, and has a funnel-like configuration in which the lower end side has an inverted conical shape with a gradually decreasing diameter toward the lower side, and the lower end side has a constant small diameter pipe portion. It has become. A lid 18 on a flat disk is also attached to the upper end opening of the second tank 117, and a plurality of peripheral portions of the lid 18 are locked by a clip-shaped locking tool 19 so as to be opened and closed. ing.

  The volumes of the tanks 13 and 17 for storing the first liquid 12 and the second liquid 16 are of a size that is practically convenient as a resin filling device, and are large enough to contain the total amount of the resin 7. It does not have to be. Moreover, in order to prevent that air mixes in the liquid to the tanks 13 and 17 which put the 1st liquid 12 and the 2nd liquid 16, you may connect a vacuum degassing apparatus as needed.

  At the lower ends of the first tank 13 and the second tank 17, the first liquid 12 and the second liquid 16 are individually taken out and injected toward the cask 1 side, and first and second injection mechanisms 20, 21 are provided. Are connected.

  The first and second injection mechanisms 20 and 21 respectively have horizontal pipe lines 20a and 21a which are parallel to each other and serve as an injection path to the cask. Pistons 22 and 23 and cylinders 24 and 25 for extruding liquid from the first tank 13 and the second tank 17 are provided on one end side of these pipe lines 20a and 21a, respectively, and the other end side of each pipe line 20a and 21a. Are provided with drive portions 28 and 29 such as an air cylinder mechanism for driving the pistons 22 and 23 via piston rods 26 and 27, respectively. The intermediate portions of the piston rods 26 and 27 are supported by a common slide support mechanism 30. The inner diameters of the cylinders 24 and 25 and the strokes of the pistons 22 and 23 are determined such that the first liquid 12 and the second liquid 16 are pushed out at a blending ratio determined for manufacturing the resin 7. The first liquid 12 and the second liquid 16 are determined by adjusting the inner diameters of the cylinders 24 and 25 and the strokes of the pistons 22 and 23 and adjusting the number of times of driving of the drive units 28 and 29 individually. You may make it become ratio.

  Flexible tubes 31 and 32 are connected to one end sides of the cylinders 24 and 25 of the first and second injection mechanisms 20 and 21, that is, end portions that are liquid extrusion sides, respectively. The tip of 32 is connected to a single static mixer 33 that mixes the first liquid 12 and the second liquid 16, and the mixed liquid of the first liquid 12 and the second liquid 16 mixed by the static mixer 33 is further hose. It is supplied to the cask 1 through 34.

  Here, the configuration of the static mixer 33 will be described with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the static mixer 33 has a liquid mixing screw 36 fixedly arranged at the center of one flow pipe 35 arranged in the vertical direction, for example. The screw 36 is long and long in the vertical direction. For example, the upper and lower ends are fixedly supported in the flow channel pipe 35 by support members 37 and 38. The screw 36 has, for example, a plurality of right-handed screw-type elements 36a and left-handed screw-type elements 36b, and a plurality of these elements 36a and 36b are arranged in series along the axial direction. Has been.

  Then, in the static mixer 15, the first liquid 12 and the second liquid 16 that have been pushed out through the tubes 31 and 32 by the first and second injection mechanisms 20 and 21 flow in, and in the element 36a portion, these are flowing. Turn right together and turn left at the next element 36b. In this way, the mixed flow of the first liquid 12 and the second liquid 16 is sufficiently mixed and homogenized as the mixed flow of the first liquid 12 and the second liquid 16 repeats the reversal by the number of the elements 36a and 36b. The resin 7 thus obtained is filled into a predetermined portion of the cask 1 through the hose 34.

  Next, the filling method of the resin 7 will be described in detail.

  First, the solution used for resin filling is divided into two liquids of a first liquid 12 and a second liquid 16 having different compositions so as to solidify after mixing, and an amount necessary for filling each part in the cask is previously determined. Prepare. That is, at least two types of liquids are prepared: a liquid obtained by mixing a main agent, a neutron absorbent, and a flame retardant, and a liquid obtained by mixing a neutron absorbent and a flame retardant with a curing agent.

  Specifically, as described above, the first liquid 12 is composed of an epoxy resin as a main agent, a neutron absorber, a flame retardant, and the like, and the second liquid 16 is composed of a curing agent, a neutron absorber, a flame retardant, and the like. Has been. The first liquid 12 and the second liquid 16 are prepared by stirring and mixing the prepared raw materials using a separate container and a stirrer so as to be homogeneous, so that a predetermined blending ratio is obtained. At this time, it is desirable to perform vacuum defoaming so that air is not mixed in the liquid.

  The particle diameters and compositions of the constituent agents of the first liquid 12 and the second liquid 16 are adjusted so that the viscosity is compatible with the injection mechanisms 20 and 21 and the static mixer 33.

  Similarly, the composition of the main agent of the first liquid 12 and the curing agent of the second liquid 16 is adjusted so that the composition is cured in a time suitable for the filling operation of the resin 7 after mixing by the static mixer 33. Further, the resin 7 varies in curing time and viscosity due to temperature differences. For this reason, the temperature of the first and second liquids is adjusted as necessary so as not to be affected by the environmental temperature, etc., so as to be suitable for the static mixer 33 and suitable for the resin filling operation after mixing. Thus, you may set to predetermined | prescribed hardening time and viscosity. Further, the extrusion speed may be adjusted so that the first liquid and the second liquid are extruded at a predetermined blending ratio.

  In this way, the raw materials are stirred and mixed in advance to prepare the first liquid 12 and the second liquid 16 in amounts necessary for filling each part of the cask, and the two liquids are individually stored in the tanks 13 and 17, respectively. Since the 1st liquid 12 and the 2nd liquid 16 have made the main ingredient and the hardening | curing agent separate, neither will be hardened alone, but hardening will be started only after two liquids are mixed.

  Next, the two liquids are separately put into the tanks 13 and 17, and the pistons 22 and 13b of the drive units 28 and 29 are driven with a predetermined stroke. In the process of moving the pistons 22 and 23 in the return direction of the piston rods 26 and 27 (direction of arrow a in FIG. 1) by the drive units 28 and 29, the first liquid 12 and the second liquid 16 are discharged from the tanks 13 and 17, respectively. In the process of flowing into the cylinders 24 and 25 and then moving the pistons 22 and 23 in the protruding direction of the piston rods 26 and 27 (direction of arrow b in FIG. 1) by the drive units 28 and 29, the first liquid The second liquid moves to the static mixer 15 side in the cylinders 24 and 25, respectively.

  The first liquid 12 and the second liquid 16 are pushed out to the tubes 31 and 32 at a predetermined blending ratio due to a difference in return stroke set in each piston 22 and 23 or a difference in inner diameter of the cylinders 24 and 25. And flows into the static mixer 15. The driving speeds of the pistons 22 and 23 may be adjusted so that the first liquid 12 and the second liquid 16 are pushed out at a predetermined blending ratio.

  In the static mixer 15, as shown in FIGS. 2 and 3, they turn right together in the element 36a portion, and turn left in the next element 36b portion. In this way, the mixed flow of the first liquid 12 and the second liquid 16 is sufficiently mixed and homogenized as the mixed flow of the first liquid 12 and the second liquid 16 repeats the reversal by the number of the elements 36a and 36b.

  The first liquid and the second liquid are turned together by the element 30 and then turned left by the element 31. As long as the mixed flow of the first liquid and the second liquid repeatedly inverts by the number of elements, they are sufficiently mixed and homogenized. The resin 7 thus produced is filled into a predetermined portion of the cask 1 through the hose 17.

  During the resin filling, the first liquid and the second liquid are supplied to the tanks 13 and 17 of the injection mechanism as needed.

  In this way, by using the resin filling device including the static mixer 15 and the injection mechanisms 20 and 21, the resin in which the first liquid 12 and the second liquid 16 are sufficiently uniformly mixed at a predetermined blending ratio. 7 can be continuously filled into the cask 1.

  Since the first liquid 12 and the second liquid 16 are blended and adjusted to appropriate viscosities, the liquid is smoothly moved by the driving capability of the injection mechanisms 20 and 21, and the rotation and mixing in the static mixer 33 are performed. Well done.

  In addition, the first liquid 12 and the second liquid 16 are optimized for blending adjustment of the main agent and the curing agent so that the curing is performed in an appropriate time after mixing by the static mixer 33. The filling operation is not restricted, and it is possible to obtain a resin 7 having a good quality without cracking or shrinkage after curing.

  In addition, in the above embodiment, although the case where two liquids were mixed as the resin 7 was demonstrated, it is applicable also when mixing three liquids or more. In that case, the apparatus components may be added as appropriate, for example, by installing three sets of tanks and injection mechanisms corresponding to the liquid.

The whole block diagram which shows one Embodiment of the filling apparatus of the resin for casks which concerns on this invention. FIG. 2 is an essential part cross-sectional view showing an enlarged configuration of the static mixer shown in FIG. 1. The expanded sectional view which expands further and shows the internal element of the static mixer shown in FIG. The longitudinal cross-sectional view which shows the structural example of the cask for both transport and storage. FIG. 5 is a cross-sectional view (transverse cross-sectional view) taken along line AA in FIG. 4.

Explanation of symbols

1 Cask 7 Resin 11 Filling Device 12 First Liquid 13 First Tank 14 Lid 15 Locking Tool 16 Second Liquid 17 Second Tank 18 Lid 19 Locking Tool 20 First Injection Mechanism 21 Second Injection Mechanism 20a , 21a Pipe line 22, 23 Piston 24, 25 Cylinder 26, 27 Piston rod 28, 29 Drive unit 30 Slide support mechanism 31, 32 Tube 33 Static mixer 36a Element 36b Element 34 Hose 35 Channel pipe 36 Screw 37, 38 Support member

Claims (6)

A tank containing a liquid containing an epoxy resin main agent, a neutron absorber and a flame retardant, another tank containing a liquid containing a curing agent for curing the main agent, and a liquid contained in each of the tanks, respectively. A cask resin comprising: an injection mechanism that continuously injects from a tank toward a cask; and a static mixer that is arranged in an injection path to the cask by the injection mechanism and mixes the liquids. Filling equipment. 2. The cask resin filling device according to claim 1, wherein the injection mechanism includes a plurality of pistons and cylinders that push liquid from the tank, and a drive unit that drives the pistons. 3. A method for filling the cask with the resin using the cask resin filling apparatus according to claim 1, wherein the base material, the neutron absorber, and the flame retardant are mixed in advance, and the coverage Prepare at least two liquids in which a neutron absorber and a flame retardant are mixed with a curing agent that cures the liquid, push the liquids through the injection mechanism, and mix the liquids through the static mixer. Thereafter, the cask resin is continuously filled into the cask resin. 4. The method for filling a cask resin according to claim 3, wherein the liquids are mixed and adjusted in advance so as to have a viscosity compatible with the injection mechanism and the static mixer. The method for filling a cask resin according to claim 3, wherein the temperature of each of the liquids is adjusted so as to be compatible with the mixing operation by the static mixer. 4. The cask resin filling method according to claim 3, wherein the composition of the main agent and the curing agent is preliminarily adjusted so as to be cured in a time suitable for the resin filling operation after mixing by the static mixer.

Images