JP2010169446A - Powder substance leak reproducing device, powder substance leak testing device, and powder substance leak test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce a leak phenomenon of a powder substance from a transport container. <P>SOLUTION: A powder substance leak reproducing device 200, which is a chamber for reproducing the inside of the transport container for storing fuel rods, is constituted of a second room S02, capable of containing a gas and the aerosolized powder substance PD scattered in the gas; a gas supply apparatus 110 for controlling the pressure of the gas in the second room S02; and a leak path reproduction part 240, having a leak path 241 which is a communication hole between the inside of the second room S02 and the outside of the second room S02 and which is capable of changing the inner diameter d of the leak path 241. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a powdery substance leakage reproduction apparatus, a powdery substance leakage test apparatus, and a powdery substance leakage test method.

  When transporting the fuel rod assembly, the fuel rod assembly is stored in a transport container and transported. In the transport container, a seal member is interposed between the main body and the lid. Thereby, as for a transport container, the clearance gap between a main body and a cover part is sealed by the sealing member.

  Here, the transport container may be lifted by a crane. Transport containers are transported with great care so that they do not fall, and even today, sufficient safety is ensured for transport of fuel rod assemblies.

  However, in order to transport the fuel rod assembly more safely, it is necessary to assume that the transport container may be impacted by the transport container falling or the transport container falling over. is there. Specifically, in order to transport the fuel rod assembly more safely, it is assumed that when the transport container receives an impact, the seal between the main body and the lid by the seal member becomes insufficient. It is necessary to keep it.

  If the seal between the main body and the lid portion by the seal member is insufficient, for example, gas may leak from the inside of the transport container. As a technique for detecting this leaked gas, Patent Document 1 discloses a technique for realizing a gas leak test in the case where a metal seal is provided on the lid of the transport container.

JP-A-2005-201909

  However, if the seal between the main body and the lid by the seal member becomes insufficient, the material leaking from the transport container may be, for example, a fuel rod or transport container in addition to gas in the transport container. Substances in which the constituent materials are finely crushed and powdered are also included. Hereinafter, a substance in which the material constituting the fuel rod and the transport container is finely crushed to form a powder is called a powder substance.

  If the sealing between the main body and the lid portion by the sealing member becomes insufficient, the powdery substance is transported through the gap between the main body and the lid portion where the sealing is insufficient together with the gas in the transport container. Leak from container. Therefore, in order to transport the fuel rod assembly more safely, assuming that the seal between the main body and the lid by the seal member is insufficient, the powdery substance leaking from the transport container The amount needs to be investigated in advance by testing.

  However, the actual transport container is large, and it is difficult to find out where on the seal member the part where the seal is insufficient is generated. Therefore, it is difficult to measure the amount of powdery substance leaking from the transport container using the actual transport container for the test.

  The present invention has been made in view of the above, and at least of reproducing the phenomenon that powdery substance leaks from the transport container and measuring the amount of powdery substance leaking from the transport container The purpose is to realize one.

  In order to solve the above-described problems and achieve the object, a powdery substance leakage reproduction apparatus according to the present invention is a room that reproduces the inside of a transport container that stores fuel rods, and is scattered in the gas and the gas. A transport container reproduction chamber capable of having an aerosolized powdery substance therein, pressure adjusting means for adjusting the pressure of the gas in the transport container reproduction chamber, the transport container reproduction chamber, and the transport container It has a leak path that is a hole communicating with the outside of the inner reproduction chamber, and includes a leak path reproduction unit that can change the inner diameter of the leak path.

  In order to solve the above-described problems and achieve the object, the powdery substance leakage test apparatus according to the present invention stores a gas supply means capable of supplying gas and adjusting the pressure of the gas, and a fuel rod. A room for reproducing the inside of the transport container, wherein the gas guided from the gas supply means and the powder-like substance scattered in the gas and aerosolized therein can be contained therein, A leakage path that is a hole that communicates between the reproduction chamber in the transport container and the outside of the reproduction chamber in the transport container, and a leak path reproduction section that can change an inner diameter of the leak path; and the reproduction chamber in the transport container through the leak path And a powdery substance amount measuring means for measuring the amount of the powdery substance leaked from the container.

  With the above configuration, the powdery substance leakage reproduction device according to the present invention can reproduce the inside of the transport container by adjusting the pressure in the transport container reproduction chamber to the pressure inside the transport container when subjected to an impact. . In addition, the powdery substance leakage reproduction apparatus according to the present invention can reproduce a leak path that is assumed to occur when the transport container receives an impact.

  Thereby, the powdery substance leakage reproduction apparatus according to the present invention has a phenomenon that the powdery substance leaks from the inside of the transport container that stores the fuel rod through the gap between the main body and the lid part that is insufficiently sealed. Can be reproduced.

  In addition, the powdery substance leakage test apparatus according to the present invention reproduces the phenomenon that powdery substance leaks from the inside of the transport container that stores the fuel rod through the gap between the main body and the lid part that has become insufficiently sealed. In addition, it is possible to measure the amount of the powdery substance that is considered to leak from the transport container.

  As a preferred aspect of the present invention, the leak path reproduction unit is configured such that a member in which the leak path is formed is detachable from a casing member constituting the reproduction chamber in the transport container, and the leak path reproduction unit has the leak path having different inner diameters. It is desirable that the inner diameter of the leak path is changed by being replaced.

  The leak path is a fine hole, and it is difficult to realize a structure in which the inner diameter changes continuously. Therefore, by using the powdery substance leakage reproduction device according to the present invention with the above configuration, members having leak paths formed in advance with different inner diameters can be attached to the leakage path reproduction unit. Thereby, if the powdery substance leakage reproduction apparatus according to the present invention is used, the inner diameter of the leak path can be easily changed.

  As a preferred aspect of the present invention, it is desirable that the powdery substance leakage reproduction apparatus includes a temperature adjusting means for adjusting the temperature of the reproduction chamber in the transport container.

  The temperature adjusting means is, for example, a heater. With the above configuration, when the powdery substance leakage test apparatus according to the present invention is used, the amount of the powdery substance leaking from the reproduction container in the transport container can be measured by adjusting the temperature of the reproduction container in the transport container to a predetermined temperature. .

  As a preferred aspect of the present invention, the powder substance leakage reproduction apparatus includes a powder substance supply unit for supplying the powder substance to the transport container reproduction chamber, and the gas to the transport container reproduction chamber. It is preferable that the gas supply unit sprays the gas toward the powdery material supplied from the powdery material supply unit.

  With the above configuration, the powdery substance leakage reproduction apparatus according to the present invention scatters the powdery substance supplied from the powdery substance supply part into the reproduction chamber in the transport container by the gas flow supplied from the gas supply part. . Thereby, the powdery substance leakage reproduction apparatus which concerns on this invention can aerosolize a powdery substance in the reproduction chamber in a transport container.

  In order to solve the above-described problems and achieve the object, a powdery substance leakage test method according to the present invention is a room that reproduces the inside of a transport container that stores fuel rods, and is scattered in the gas and the gas. A transport container reproduction chamber capable of having an aerosolized powdery substance therein, pressure adjusting means for adjusting the pressure of the gas in the transport container reproduction chamber, the transport container reproduction chamber, and the transport container A powder substance leakage test method using a powder substance leakage reproduction device comprising a leak path that has a leak path communicating with the outside of the inner reproduction chamber and can change the inner diameter of the leak path And the quantity of the said powdery substance leaked from the said reproduction | regeneration chamber in a transport container through the said leak path of a predetermined magnitude | size is measured, It is characterized by the above-mentioned.

  By adjusting the inside diameter of the leak path by the above powder substance leakage test method, the amount of the powder substance leaked from the reproduction chamber in the transport container through the leak path of a predetermined size can be measured. Thereby, when a transport container falls or falls and receives an impact, the quantity of the powdery substance assumed to leak from the part where the seal | sticker became inadequate can be estimated. Here, the predetermined size is, for example, the size when the areas of a plurality of leak paths generated in the seal member of the transport container are summed up and integrated into one leak path.

  As a preferred aspect of the present invention, it is desirable to change the size of the leak path and measure the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path of each size.

  By the above powder substance leakage test method, it is possible to investigate how the amount of powder substance leaking from the reproduction chamber in the transport container changes due to the change in the size of the leak path.

  As a preferred embodiment of the present invention, the pressure difference between the gas inside the reproduction chamber in the transport container and the pressure outside the reproduction chamber in the transport container is changed, and the reproduction in the transport container is performed via the leak path. It is desirable to measure the amount of the powdery substance that has leaked from the chamber.

  By the above powdery substance leakage test method, it is possible to investigate how the amount of the powdery substance leaking from the reproduction chamber in the transport container changes due to the change in the differential pressure.

  As a preferred embodiment of the present invention, it is desirable to measure the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path by changing the size of the powdery substance.

  By the above powder substance leakage test method, it is possible to investigate how the amount of the powder substance leaking from the reproduction chamber in the transport container changes due to the change in the size of the powder substance.

  As a preferred aspect of the present invention, it is desirable to change the temperature of the reproduction chamber in the transport container and measure the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path.

  By the above powder substance leakage test method, it is possible to investigate how the amount of the powder substance leaking from the reproduction chamber in the transport container changes due to the change in the temperature of the gas in the reproduction chamber in the transport container.

  As a preferred aspect of the present invention, the flow direction of the gas flowing through the leak path is changed with respect to the vertical direction, and the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path is determined. It is desirable to measure.

  How the amount of powdery substance leaking from the reproduction chamber in the transport container changes when the flow direction of the gas flowing through the leak path is changed with respect to the vertical direction by the above powdery substance leakage test method Can be investigated.

  The present invention can realize at least one of reproducing a phenomenon in which a powdery substance leaks from the transport container and measuring an amount of the powdery substance leaking from the transport container.

FIG. 1 is a cross-sectional view of the cask including a central axis of the cask, with the seal member cut off. FIG. 2 is a cross-sectional view showing the powder substance leakage test apparatus cut along a plane including the central axis of the leak path reproduction unit. FIG. 3 is a graph showing an example of the relationship between the mass concentration of the powdery substance leaking through the leak path and the differential pressure for each inner diameter of the leak path. FIG. 4 is a cross-sectional view showing a powdery substance leakage test apparatus in which the direction of the leak path is arranged upward in the vertical direction. FIG. 5 is a cross-sectional view showing a powdery substance leakage test apparatus in which the direction of the leak path is arranged downward in the vertical direction.

  Hereinafter, embodiments of a powdery substance leakage reproduction apparatus, a powdery substance leakage test apparatus, and a powdery substance leakage test method according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment)
FIG. 1 is a cross-sectional view of the cask including a central axis of the cask, with the seal member cut off. Before describing the configuration of the powdery substance leakage test apparatus, which is a test apparatus for examining the amount of the powdery substance leaking from the transport container in advance, the structure of the transport container will be described first. The transport container is, for example, the cask 900 shown in FIG. The cask 900 stores therein fuel rods that are recycled fuel. The transport container is not limited to a cask and may be a container for storing new fuel.

  The cask 900 includes a trunk body 910, a lid 920, and a seal member 930. The trunk body 910 is a cylindrical member. The lid 920 is provided on one side of the trunk body 910 in the direction of the central axis CL01. The seal member 930 is, for example, a metal O-ring. The seal member 930 is provided in the gap between the trunk body 910 and the lid portion 920.

  Specifically, the trunk body 910 has a pedestal surface 911 that is a plane that intersects the central axis CL01. Further, the lid portion 920 is formed with a seal surface 921 that is a flat surface facing the pedestal surface 911. The seal member 930 is provided in an annular shape between the base surface 911 and the seal surface 921, for example, without a break.

  The seal member 930 includes, for example, an inner O-ring 931 and an outer O-ring 932. The inner O-ring 931 is disposed closer to the central axis CL01 than the outer O-ring 932. As described above, the seal member 930 includes two of the inner O-ring 931 and the outer O-ring 932, and seals by reducing the gap between the trunk body 910 and the lid portion 920.

  FIG. 2 is a cross-sectional view showing the powder substance leakage test apparatus cut along a plane including the central axis of the leak path reproduction unit. The powdery substance leakage test apparatus 100 of this embodiment shown in FIG. 2 reproduces the state where the seal between the trunk body 910 and the lid 920 is insufficient, and the seal between the trunk body 910 and the lid 920 is not satisfactory. This is a test apparatus for investigating the amount of the powdery substance PD that leaks from the inside of the cask 900 by being mixed with the gas inside the cask 900 through the sufficient part.

  Hereinafter, a portion where the seal between the trunk body 910 and the lid 920 is insufficient is referred to as a leak path. A plurality of leak paths may be formed in the annular seal member 930. The powdery substance leakage test apparatus 100 reproduces the case where these multiple leak paths are collected in one place.

  That is, by using the powdery substance leakage test apparatus 100, the amount of the powdery substance PD leaked from one leak path having a total area obtained by adding the areas of the plurality of leak paths formed in the annular seal member 930. Can be measured.

  Here, when the size of the powdery substance PD is the same and the difference between the internal pressure of the cask 900 and the external pressure is the same, the powdery substance PD leaking from each of a plurality of leak paths formed in the seal member 930. The total amount is less than or equal to the amount of the powdery substance PD leaking from the leak path having a width obtained by summing the areas of the leak paths formed on the seal member 930.

  For example, when a plurality of leak paths smaller than the size of the powder material PD are formed in the seal member 930, the powder material PD does not leak from the cask 900 through the leak path. However, when the plurality of leak paths are aggregated into one, the aggregated leak paths may be larger than the size of the powdery substance PD. In this case, the powdery substance PD may leak from the cask 900 through the aggregated leak path.

  As described above, the total amount of the powdery substance PD leaking from each of the plurality of leak paths formed in the seal member 930 is the leak path having a width obtained by summing the areas of the plurality of leak paths formed in the seal member 930. It does not necessarily match the amount of the powdery substance PD that leaks from.

  However, the actual amount of the powdery substance PD that is assumed to leak from the inside of the cask 900 due to impact is not larger than the amount measured using the powdery substance leakage test apparatus 100. It becomes below the quantity measured using the powdery substance leakage test apparatus 100. Therefore, if the result measured using the powdery substance leakage test apparatus 100 is a result that can sufficiently secure safety, even if the cask 900 is shocked, it can be determined that the cask 900 can sufficiently secure safety. .

  The powder substance leakage test apparatus 100 includes a gas supply apparatus 110 as a gas supply means, a powder substance amount measurement apparatus 190 as a powder substance amount measurement means, and a powder substance leakage reproduction apparatus 200. The The gas supply device 110 supplies the same gas as the gas inside the cask 900 to the powder substance leakage reproduction device 200 at a predetermined pressure. In addition, the gas which the gas supply apparatus 110 supplies to the powdery substance leakage reproduction apparatus 200 is helium, for example.

  The powdery substance amount measuring apparatus 190 is an apparatus that measures the amount of the powdery substance PD contained in the gas that has passed through the powdery substance leakage reproduction apparatus 200. Specifically, the powder substance amount measuring apparatus 190 is, for example, the mass of the powder substance PD obtained from the mass of the powder substance PD with respect to the mass of the gas and the powder substance PD that has passed through the powder substance leakage reproduction apparatus 200. Measure the concentration.

  Below, the powder substance amount measuring apparatus 190 shows the example of the method used when measuring the mass concentration of the powder substance PD. However, the method used when the powder substance measuring device 190 measures the mass concentration of the powder material PD is not limited to the method described below, as long as the method can measure the mass concentration of the powder material PD. Good.

(Β-ray absorption method)
The powder amount measuring device 190 supplies β-rays to the powdery material PD collected on the filter paper, and the amount of β-rays absorbed by the powdery material PD is increased by a scintillation detector, an ionization chamber, a semiconductor detector, or the like. Detect the amount. The powdery substance amount measuring apparatus 190 measures the mass concentration of the powdery substance PD based on the detection result.

(Piezoelectric balance method)
The powdery substance amount measuring device 190 electrostatically collects the powdery substance PD on the crystal resonator. When the mass of the powdery substance PD collected on the quartz oscillator changes, the powder substance measuring device 190 changes the frequency of the quartz oscillator. The powdery substance amount measuring apparatus 190 measures the mass concentration of the powdery substance PD based on the amount of change in the vibration frequency of the crystal resonator.

(Filter vibration method)
The powdery substance amount measuring device 190 includes a conical vibrator, and the mass concentration of the powdery substance PD is based on a decrease in the frequency of the conical vibrator caused by the powdery substance PD collected on the filter paper. Measure.

(Light scattering method)
When light collides with the powdery substance PD, light scattering occurs. At this time, the light scattering intensity is proportional to the mass of the powdery substance PD. The powder amount measuring apparatus 190 obtains an indication value of the relative concentration of the powder substance PD with respect to the gas that has passed through the powder substance leakage reproduction apparatus 200 based on the light scattering intensity.

(Absorptiometric method)
The powdery substance amount measuring apparatus 190 measures the mass concentration of the powdery substance PD based on changes in the amount of light absorbed and the amount of reflection by the powdery substance PD collected on the filter paper.

(Light transmission method)
When light is projected into the gas containing the powdery substance PD, a part of the light is blocked by the powdery substance PD. The powder substance measuring device 190 is configured to receive light when a light is projected into a gas that does not contain the powder substance PD, and to a light received when a light is projected into the gas that contains the powder substance PD. Based on this, the mass concentration of the powdery substance PD is measured.

(Friction static electricity detection method)
When the two powder substances PD come into contact with each other, charge transfer occurs between the two powder substances PD. Thereby, frictional static electricity is generated. The powder substance measuring device 190 is configured to include a probe-like sensor.

  When the powdery substance PD collides with the sensor or passes near the sensor, an electric charge moves between the sensor and the powdery substance PD. Based on the magnitude of the current generated by this, the powdery substance amount measuring device 190 measures the mass concentration of the powdery substance PD.

  Next, the configuration of the powdery substance leakage reproduction apparatus 200 will be described. The powdery substance leakage reproduction apparatus 200 is disposed between the gas supply device 110 and the powdery substance amount measuring apparatus 190, and the powdery substance PD is inside the cask 900 through a leak path formed in the seal member 930. Reproduce the phenomenon of leakage from.

  The powdery substance leakage reproduction device 200 includes, in order from the gas supply device 110 toward the powdery substance amount measurement device 190, a first chamber S01, a second chamber S02 as a reproduction chamber in a transport container, and a third chamber S03. Is placed. The first chamber S01, the second chamber S02, and the third chamber S03 are, for example, spaces surrounded by a cylindrical casing. The second room S02 is a room that reproduces the inside of the cask 900.

  The powdery substance leakage test apparatus 100 supplies the mass concentration of the powdery substance PD contained in the gas that is supplied from the gas supply apparatus 110 to the first chamber S01 and reaches the third chamber S03 via the second chamber S02. The powder substance measuring device 190 measures.

  The powdery substance leakage reproduction device 200 includes a gas supply part 220, a powdery substance supply part 230, a leak path reproduction part 240, a differential pressure gauge 250, and a heater 260 as temperature adjusting means. The gas supply unit 220 is formed between the first chamber S01 and the second chamber S02.

  The gas supply unit 220 includes a throttle unit 221 having an inner diameter that is smaller than the inner diameter of the casing of the first chamber S01. The flow rate of the gas supplied from the gas supply device 110 to the first chamber S01 is increased by the throttle unit 221 when passing through the gas supply unit 220.

  The powdery substance supply unit 230 is a hole for supplying the powdery substance PD to the second chamber S02. The powdery substance supply unit 230 is formed in the second chamber S02. The position where the powdery substance supply unit 230 is formed is preferably closer to the gas supply unit 220. This is because the closer to the gas supply unit 220, the faster the flow velocity of the gas flowing in the second chamber S02.

  In the present embodiment, the powdery substance supply unit 230 is provided in a portion adjacent to the gas supply unit 220. Thereby, the gas supply part 220 will spray gas toward the powdery substance PD supplied from the powdery substance supply part 230. FIG. Therefore, the powdery substance leakage reproduction apparatus 200 causes the powdery substance PD supplied to the second chamber S02 via the powdery substance supply unit 230 to enter the second chamber S02 by the gas blown from the throttle unit 221. It can be dispersed and aerosolized.

  Even if the powdery substance supply unit 230 is not formed at a position adjacent to the gas supply part 220, the powdery substance leakage reproduction device 200 converts the powdery substance PD into the second substance by the gas blown out from the throttle unit 221. Any structure that can be dispersed in the chamber S02 to be aerosolized may be used.

  Here, the gas supply unit 220 realizes both a function of supplying a gas to the second chamber S02 and a function of scattering the powdery material PD supplied from the powdery material supply unit 230 into the second chamber S02. However, the powdery substance leakage reproduction apparatus 200 scatters the means for supplying gas to the second chamber S02 and the powdery substance PD supplied from the powdery substance supply unit 230 into the second chamber S02. These means may be provided separately.

  In this case, in the powdery substance leakage reproduction apparatus 200, the gas is directly supplied from the gas supply apparatus 110 to the second chamber S02 without forming the first chamber S01 and the restricting portion 221. On the other hand, in the powder substance leakage reproduction apparatus 200, a gas ejection port is provided in the vicinity of the powder material supply unit 230, and the powder material PD is contained in the second chamber S02 by the gas ejected from the ejection port. Is scattered.

  Even with the above configuration, the powdery substance leakage reproduction apparatus 200 supplies gas to the second chamber S02 and scatters the powdery substance PD supplied from the powdery substance supply unit 230 into the second chamber S02. be able to. However, in the powdery substance leakage reproduction device 200, the gas supply unit 220 supplies the gas to the second chamber S02 and the powdery substance PD supplied from the powdery substance supply unit 230 in the second chamber S02. It is preferable to realize both the function of scattering because the number of parts is reduced.

  The leak path reproduction unit 240 is formed between the second chamber S02 and the third chamber S03. The leak path reproduction unit 240 includes a leak path 241 formed at a predetermined inner diameter d. The leak path 241 is a hole that communicates the second chamber S02 and the third chamber S03. In the present embodiment, the leak path 241 is formed by a narrowed portion having an inner diameter d smaller than the inner diameter of the second chamber S02.

  Here, the inner diameter d of the leak path 241 is set based on the total area of the leak paths formed in the seal member 930. Therefore, the inner diameter d of the leak path 241 is not necessarily smaller than the inner diameter of the second chamber S02. However, since it is difficult to assume a case where the inner diameter d of the leak path 241 is larger than the inner diameter of the second chamber S02, the leak path 241 is actually formed as a throttle portion.

  The leak path reproduction unit 240 is formed so that the member in which the leak path 241 is formed can be removed from the casings constituting the second chamber S02 and the third chamber S03. Thereby, the powder substance leak reproduction apparatus 200 can reproduce leak paths of various sizes by attaching members having different inner diameters d of the leak paths 241 to the casings constituting the second chamber S02 and the third chamber S03.

  The differential pressure gauge 250 measures a differential pressure P01 that is a difference between the pressure of the gas in the second chamber S02 and the pressure of the gas in the third chamber S03. That is, the differential pressure P01 between the upstream side and the downstream side of the gas flow is measured with the leak path reproduction unit 240 as a boundary.

  The heater 260 is a means for adjusting the temperature of the second chamber S02. For example, the heater 260 is attached to the casing of the second chamber S02 and adjusts the temperature of the second chamber S02. Here, the temperature of the second chamber S02 is specifically the temperature of the casing constituting the second chamber S02 and the temperature of the gas in the second chamber S02.

  Here, the heater 260 of the present embodiment adjusts the temperature of the gas in contact with the casing by adjusting the temperature of the casing of the second chamber S02, but the heater 260 is, for example, in the second chamber S02. A heat transfer unit may be provided to directly adjust the temperature of the gas in the second chamber S02.

  Next, a test method using the powdery substance leakage test apparatus 100 having the above configuration will be described. First, gas is supplied from the gas supply device 110 to the first chamber S01. At this time, the worker checks the differential pressure gauge 250 and adjusts the pressure of the gas supplied from the gas supply device 110 to the first chamber S01 so that the differential pressure P01 becomes a predetermined pressure. Here, the predetermined pressure is a pressure difference between the assumed internal pressure of the cask 900 and the external pressure.

  The powdery substance leakage test apparatus 100 is configured to adjust the differential pressure P01 by operating the gas supply device 110 as pressure adjusting means while an operator confirms the differential pressure gauge 250. For example, the test apparatus 100 may include a computer, and the computer may automatically control the gas supply apparatus 110 so that the differential pressure P01 matches a predetermined pressure set in advance.

  Further, the worker operates the heater 260 to adjust the temperature of the second chamber S02 to a predetermined temperature. Here, the predetermined temperature is, for example, an assumed temperature inside the cask 900.

  Next, in the powdery substance leakage test apparatus 100, the powdery substance PD is supplied to the second chamber S02 via the powdery substance supply unit 230. Here, as described above, the gas in the first chamber S01 is supplied to the second chamber S02 with the flow rate increased by the gas supply unit 220.

  Therefore, the powdery substance PD supplied to the second chamber S02 via the powdery substance supply unit 230 is scattered into the second chamber S02 by the gas whose flow rate has been increased by the gas supply unit 220 and is aerosolized. . Next, the gas in the second chamber S02 containing the aerosolized powdery substance PD leaks into the third chamber S03 via the leak path 241.

  Next, in the powdery substance leakage test apparatus 100, the powdery substance amount measuring apparatus 190 measures the mass concentration of the powdery substance PD contained in the gas in the third chamber S03. Thus, the powdery substance leakage test apparatus 100 measures the mass concentration of the powdery substance PD that leaks through a leak path having a predetermined size.

  Here, the size of the leak path generated when the cask 900 receives an impact is not always constant. Therefore, the leak path reproduction unit 240 is replaced with a member in which the leak path 241 having a different inner diameter d is formed, and the test is performed by the test method described above. Thereby, the powdery substance leakage test apparatus 100 can investigate the change in the mass concentration of the powdery substance PD when the inner diameter of the leak path 241 changes.

  The above-described test method is a test method on the assumption that the differential pressure P01 is constant at a predetermined pressure. The pressure inside the cask 900 may be different depending on the type of the cask 900. For example, in a wet cask in which water is stored together with the fuel rod, the differential pressure P01 is greatly different from that in a dry cask in which water is not stored in the interior together with the fuel rod.

  Whether or not the cask 900 can be safely transported even if the differential pressure P01 is constant at the maximum pressure assumed and the mass concentration of the powdery substance PD is measured using the powdery substance leakage test apparatus 100. Can be judged. However, if the change in the mass concentration of the powdery substance PD leaking through the leak path can be investigated when the differential pressure P01 fluctuates, it can be more reliably determined whether or not the cask 900 can be safely transported.

  When the change in the mass concentration of the powdery substance PD that leaks through the leak path when the differential pressure P01 fluctuates, the pressure of the gas supplied from the gas supply device 110 to the first chamber S01 is gradually changed. . Thereby, the powdery substance leakage test apparatus 100 can investigate the change of the mass concentration of the powdery substance PD leaking through the leak path 241 by gradually changing the differential pressure P01.

  FIG. 3 is a graph showing an example of the relationship between the mass concentration of the powdery substance leaking through the leak path and the differential pressure for each inner diameter of the leak path. The curve shown by the solid line in FIG. 3 is a curve showing the relationship between the mass concentration of the powdery substance PD leaked through the leak path and the differential pressure when the size of the leak path is the inner diameter d01.

  3 is a curve showing the relationship between the mass concentration of the powdery substance PD leaked through the leak path and the differential pressure when the size of the leak path is the inner diameter d02. Further, the curve indicated by the alternate long and short dash line in FIG. 3 is a curve showing the relationship between the mass concentration of the powdery substance PD leaked through the leak path and the differential pressure when the size of the leak path is the inner diameter d03. The inner diameter d01> the inner diameter d02> the inner diameter d03.

  For example, when the size of the leak path is constant at the inner diameter d01 and the differential pressure P01 is gradually changed, a graph as shown by a solid line in FIG. 3 is obtained. Further, by performing the same test while changing the size of the leak path to, for example, the inner diameter d02 or the inner diameter d03, it is considered that a plurality of graphs as indicated by broken lines or one-dot chain lines in FIG. 3 can be obtained.

  Here, when the cask 900 receives an impact, the size of the powdery substance PD generated in the cask 900 is not always constant. Therefore, the powder material PD supplied from the powder material supply unit 230 to the second chamber S02 is changed in size and tested by the test method described above.

  Thereby, the powdery substance leakage test apparatus 100 can investigate the change in the mass concentration of the powdery substance PD that leaks through the leak path when the size of the powdery substance PD changes.

  In addition, as one of the test methods using the powdery substance leakage test apparatus 100, there is also a method of testing by the above test method by gradually changing the temperature of the second chamber S02 by controlling the heater 260. Thereby, the powdery substance leakage test apparatus 100 can investigate the change in the mass concentration of the powdery substance PD that leaks through the leak path when the temperature of the second chamber S02 changes.

  Here, the cask 900 is usually installed such that the central axis CL01 shown in FIG. 1 is along the vertical direction. The lid 920 is attached to the trunk body 910 so that the plane is along the direction intersecting the central axis CL01, for example, the horizontal direction. However, if the cask 900 falls or falls, the central axis CL01 of the cask 900 does not always follow the vertical direction.

  Thereby, the direction of the leak path formed in the seal member 930 is not always along the horizontal direction. Therefore, it is preferable to assume that the leak path faces in all directions. The direction of the leak path is the flow direction of the gas flowing through the leak path.

  FIG. 4 is a cross-sectional view showing a powdery substance leakage test apparatus in which the direction of the leak path is arranged upward in the vertical direction. FIG. 5 is a cross-sectional view showing a powdery substance leakage test apparatus in which the direction of the leak path is arranged downward in the vertical direction.

  When conducting a powdery substance leakage test assuming that the leak path faces in all directions, the whole powdery substance leakage test apparatus 100 shown in FIG. 2 is tilted, and the central axis CL02 of the leak path 241 is tilted with respect to the horizontal direction. The powdery substance leakage test apparatus 100 may be tested, but if the whole powdery substance leakage test apparatus 100 cannot be tested by tilting, the powdery substance leakage test apparatus 100 may be the powdery substance leakage reproduction apparatus 300 shown in FIG. A substance leakage reproduction apparatus 400 is included.

  In the leakage path reproduction unit 340 of the powdery substance leakage reproduction apparatus 300 shown in FIG. 4, the direction of the leakage path 341 is formed upward in the vertical direction. Specifically, the leak path 341 is provided with the central axis CL02 along the vertical direction. The third chamber S03 is arranged on the upper side in the vertical direction of the second chamber S02. Thereby, the gas containing the powdery substance PD in the second chamber S02 flows upward in the vertical direction via the leak path 341.

  With the above configuration, when the powdery substance leakage test apparatus 100 including the powdery substance leakage reproduction apparatus 300 is used, the powdery substance PD that leaks through the leak path when the leak path is directed upward in the vertical direction is used. Mass concentration can be measured.

  In the leakage path reproduction unit 440 of the powder substance leakage reproduction apparatus 400 shown in FIG. 5, the direction of the leakage path 441 is formed downward in the vertical direction. Specifically, the leak path 441 is provided with the central axis CL02 along the vertical direction. The third chamber S03 is disposed on the lower side in the vertical direction of the second chamber S02. Thereby, the gas containing the powdery substance PD in the second chamber S02 flows downward in the vertical direction via the leak path 441.

  In the case of the above configuration, it is assumed that the powdery substance PD in the second chamber S02 is attracted by gravity and accumulates in a portion where the leak path 441 of the leak path reproduction unit 440 is formed. In this case, the opening of the leak path 441 is closed by the powdery substance PD.

  As described above, when the powdery substance leakage test apparatus 100 including the powdery substance leakage reproduction apparatus 400 is used, the powdery substance PD is piled on the leak path, and the leak path is blocked. The mass concentration of the powdery substance PD leaking downward in the vertical direction can be measured.

  In addition, although the powdery substance leakage reproduction apparatus 300 shown in FIG. 4 and the powdery substance leakage reproduction apparatus 400 shown in FIG. 5 set the direction of the central axis CL02 to the vertical direction, the direction of the central axis CL02 is set to the vertical direction. It is not limited. For example, the direction of the central axis CL02 may be a direction that intersects both the vertical direction and the horizontal direction.

  As described above, the powdery substance leakage reproduction device, the powdery substance leakage test apparatus, and the powdery substance leakage test method according to the present invention are useful for reproducing the phenomenon of powdery substance leakage from the transport container, In particular, it is suitable for measuring the amount of powdery substance leaking from the transport container.

DESCRIPTION OF SYMBOLS 100 Powder substance leak test apparatus 110 Gas supply apparatus 190 Powder substance amount measuring apparatus 200 Powder substance leak reproduction apparatus 220 Gas supply part 221 Restriction part 230 Powder substance supply part 240 Leak path reproduction part 241 Leak path 250 Differential pressure gauge 260 Heater 300 Powder substance leakage reproduction device 340 Leak path reproduction unit 341 Leak path 400 Powder material leakage reproduction device 440 Leak path reproduction unit 441 Leak path 900 Cask 910 Body main body 911 Base surface 920 Lid portion 921 Seal surface 930 Seal member 931 Inner O ring 932 Outer O ring CL01 center axis CL02 center axis d inner diameter d01 inner diameter d02 inner diameter d03 inner diameter P powdery substance P01 differential pressure S01 first chamber S02 second chamber S03 third chamber

Claims (11)

A room that reproduces the inside of the transport container that stores the fuel rods, and the inside of the transport container that can have a gas and a powdered substance dispersed in the gas and aerosolized therein,
Pressure adjusting means for adjusting the pressure of the gas in the reproduction chamber in the transport container;
A leak path reproducing unit having a leak path that is a hole that communicates between the reproduction chamber in the transport container and the outside of the reproduction chamber in the transport container, and can change the inner diameter of the leak path;
An apparatus for reproducing leakage of powdery substances, comprising: The leak path reproduction unit
The member in which the leak path is formed is configured to be detachable from a casing member that constitutes the reproduction chamber in the transport container,
The powder substance leakage reproduction apparatus according to claim 1, wherein the internal diameter of the leak path is changed by being replaced with a member having the leak path of a different internal diameter. The powdery substance leakage reproduction device is
A powdery substance supply unit for supplying the powdery substance to the reproduction chamber in the transport container;
A gas supply part for supplying the gas to the reproduction chamber in the transport container;
Comprising
3. The powder substance leakage reproduction device according to claim 1, wherein the gas supply unit blows the gas toward the powder substance supplied from the powder substance supply unit. 4. The powdery substance leakage reproduction device is
The powder substance leakage reproduction apparatus according to any one of claims 1 to 3, further comprising a temperature adjusting unit that adjusts a temperature of the reproduction chamber in the transport container. A gas supply means capable of supplying a gas and adjusting a pressure of the gas;
It is a room that reproduces the inside of a transport container that stores fuel rods, and the inside of the transport container that can have the gas guided from the gas supply means and the powdered substance scattered and aerosolized in the gas inside The reproduction room,
A leak path reproducing unit having a leak path that is a hole that communicates between the reproduction chamber in the transport container and the outside of the reproduction chamber in the transport container, and can change the inner diameter of the leak path;
A powdery substance amount measuring means for measuring the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path;
A powdery substance leakage test apparatus comprising: A room that reproduces the inside of the transport container that stores the fuel rods, and the inside of the transport container that can have a gas and a powdered substance dispersed in the gas and aerosolized therein,
Pressure adjusting means for adjusting the pressure of the gas in the reproduction chamber in the transport container;
A leak path reproducing unit having a leak path that is a hole that communicates between the reproduction chamber in the transport container and the outside of the reproduction chamber in the transport container, and can change the inner diameter of the leak path;
A powdery substance leakage test method using a powdery substance leakage reproduction device comprising:
A powdery substance leakage test method characterized by measuring an amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path having a predetermined size.   The amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path of each size is measured by changing the size of the leak path. Substance leakage test method.   The powdery substance leaked from the reproduction chamber in the transport container through the leak path by changing a differential pressure between the pressure of the gas in the reproduction chamber in the transport container and the pressure outside the reproduction chamber in the transport container The method for testing a leakage of powdery substances according to claim 6 or 7, characterized in that the amount of the powder is measured.   The size of the powdery substance is changed, and the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path is measured. The powdery substance leakage test method according to one item.   The temperature of the reproduction chamber in the transport container is changed, and the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path is measured. The powdery substance leakage test method according to claim 1.   The flow direction of the gas flowing through the leak path is changed with respect to a vertical direction, and the amount of the powdery substance leaked from the reproduction chamber in the transport container through the leak path is measured. The powdery substance leakage test method according to any one of Items 6 to 10.

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