JP6339898B2 - Radioiodine removal device and nuclear power plant - Google Patents

Description

  The present invention relates to an iodine removing apparatus and a nuclear power plant.

  As background art of this technical field, there is a gas processing facility described in Patent Document 1 below.

  This publication describes an iodine adsorption device provided in a gas processing facility as “the iodine adsorption device is provided with an iodine adsorbent layer in a casing around which a heat transfer tube of a heat exchanger is wound”. . Also, “When the accident of loss of cooling water occurs, if the external power supply and all the AC power supply of the emergency diesel generator are lost, it was released into the drywell from the breakage point of the main steam pipe. Water vapor, hydrogen gas, oxygen gas, fission product, which is a radionuclide, and nitrogen gas present in the reactor containment vessel are supplied into the heat transfer tube of the heat exchanger through the gas supply tube. The temperature of the gas supplied to the cylinder is heated by the heat transmitted from the casing, and the temperature rises to the saturation temperature, so that condensation in the casing can be prevented, so that the adsorption performance of radioactive iodine by the iodine adsorbent layer, that is, radioactive "Iodine treatment performance is improved."

JP 2014-48043 A (see paragraphs 0046 to 0049)

  However, the heating of the iodine adsorbent layer in the iodine adsorbing device described in Patent Document 1 is based on the heat transmitted from the periphery of the casing that houses the iodine adsorbing material layer. For this reason, the heating efficiency of the iodine adsorbent layer is not sufficient, and the effect of preventing condensation is limited.

  Therefore, the present invention provides an iodine removing device that can effectively prevent condensation of the iodine adsorbing member, and thereby can maintain high iodine adsorption efficiency.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above-mentioned problems. To give an example, a pipe supplied with a treatment gas containing iodine, a filter vent arranged on the pipe path, and the pipe A heating member disposed on the downstream side of the filter vent and reacting with a component in the processing gas to generate reaction heat, and iodine adsorption disposed in the processing gas supply path heated by the reaction heat And a member.

ADVANTAGE OF THE INVENTION According to this invention, the iodine removal apparatus which can prevent the condensation of an iodine adsorption member effectively and can maintain the adsorption | suction efficiency of iodine highly by this can be provided.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is an example of the block diagram of the iodine removal apparatus which concerns on 1st Embodiment, and a nuclear power plant using the same. It is a block diagram of the modification 1 of the iodine removal apparatus which concerns on 1st Embodiment. It is a block diagram of the modification 2 of the iodine removal apparatus which concerns on 1st Embodiment. It is a block diagram of the modification 3 of the iodine removal apparatus which concerns on 1st Embodiment. It is a block diagram of the modification 4 of the iodine removal apparatus which concerns on 1st Embodiment. It is an example of the block diagram of the iodine removal apparatus which concerns on 2nd Embodiment. It is an example of the block diagram of the iodine removal apparatus which concerns on 3rd Embodiment. It is an example of the block diagram of the iodine removal apparatus which concerns on 4th Embodiment. It is an example of the block diagram of the iodine removal apparatus which concerns on 5th Embodiment. It is an example of the block diagram of the iodine removal apparatus which concerns on 6th Embodiment, and a nuclear power plant using the same.

  Hereinafter, embodiments of an iodine removing apparatus and a nuclear power plant according to the present invention will be described in detail with reference to the drawings. In each embodiment and each modification described below, the same components are denoted by the same reference numerals, and redundant description is omitted.

<< First Embodiment >>
FIG. 1 is an example of a configuration diagram of an iodine removing apparatus 1 according to the first embodiment and a nuclear power plant 100 using the same. The iodine removing apparatus 1 shown in FIG. 1 is an apparatus for removing iodine in the processing gas using the gas discharged from the reactor containment vessel 100b storing the nuclear reactor 100a as a processing gas. The iodine removal apparatus 1 is also an element constituting the nuclear power plant 100 together with the nuclear reactor 100a and the nuclear reactor containment vessel 100b.

  Such an iodine removing apparatus 1 includes a pipe 11 that extends from the reactor containment vessel 100b that houses the reactor 100a. On the path of the pipe 11, a filter vent 13, a heat generating tank 15, and an iodine adsorption tank 17 are arranged in series in this order from the reactor containment vessel 100 b side.

  Hereinafter, prior to describing the details of these components, the configuration of the reactor 100a and the reactor containment vessel 100b in which the iodine removing device 1 is provided will be described, and then the details of each component of the iodine removing device 1 will be described. explain.

<Reactor 100a>,
The nuclear reactor 100 a constitutes the nuclear power plant 100 together with the nuclear reactor containment vessel 100 b and the iodine removing device 1. The type of the nuclear reactor 100a is not limited. The nuclear reactor 100a may be any of a boiling water reactor (BWR), a pressurized water reactor (PWR), or a fast breeder reactor (FBR). Here, as an example, the nuclear reactor 100a will be described with a BWR type illustrated.

  The BWR type nuclear reactor 100a includes a pressure vessel 103 that accommodates a core 101 that is an assembly of nuclear fuel in a state of being immersed in the reactor water L. The pressure vessel 103 is stored in the reactor containment vessel 100b. A main steam pipe 107, a condensate pipe 109, and a circulation pipe 111 are connected to the pressure vessel 103.

  Of these, the main steam pipe 107 is connected to the top of the pressure vessel 103 and extends outside the reactor containment vessel 100b. The main steam pipe 107 is connected to a turbine and a condenser that are not shown here, outside the reactor containment vessel 100b. On the other hand, the condensate pipe 109 is connected to the lower part of the pressure vessel 103 and a condenser connected to the main steam pipe 107. The circulation pipe 111 is connected to the lower part of the pressure vessel 103 and circulates the reactor water L in the pressure vessel 103. The circulation pipe 111 is stored in the reactor containment vessel 100 b together with the pressure vessel 103.

<Reactor containment vessel 100b>
The nuclear reactor containment vessel 100b stores the nuclear reactor 100a described above. When the reactor 100a to be stored is a BWR type, the reactor containment vessel 100b has a suppression chamber 113 having a pressure suppression pool in which cooling water L1 for suppressing pressure is stored, and the inside is nitrogen. Filled with gas (N ₂ ). The limiting temperature and limiting pressure of the reactor containment vessel 100b are 200 ° C. and 0.7 MPa, respectively, which are about twice the design pressure.

<Piping 11>
The piping 11 is connected to the upper part of the reactor containment vessel 100b and the upper part of the suppression chamber 113 in the reactor containment vessel 100b. This piping 11 is for discharging the gas in the reactor containment vessel 100b and preventing the reactor containment vessel 100b from being damaged when the internal pressure of the reactor containment vessel 100b rises. Therefore, the pipe 11 has the most upstream connection with the reactor containment vessel 100b, and the extending direction thereof is the downstream side.

  Such a pipe 11 includes a supply pipe 11a upstream of the filter vent 13, a connection pipe 11b between the filter vent 13 and the heat generating tank 15, a connection pipe 11c between the heat generating tank 15 and the iodine adsorption tank 17, And a gas discharge pipe 11 d on the downstream side of the iodine adsorption tank 17.

  The supply pipe 11a upstream of the filter vent 13 in the pipe 11 is connected to the upper part of the reactor containment vessel 100b and the upper part of the suppression chamber 113 in the reactor containment vessel 100b. These supply pipes 11a are each provided with an automatic opening / closing valve 11e, and are connected to the filter vent 13 in a state of being integrated into one on the upstream side of the filter vent 13, for example, as illustrated. The automatic open / close valve 11e provided in each supply pipe 11a opens the supply pipe 11a when the inside of the reactor containment vessel 100b rises to a predetermined pressure. The predetermined pressure at which the supply pipe 11a is opened by the automatic opening / closing valve 11e is set to a value smaller than the limit pressure of the reactor containment vessel 100b. It should be noted that which one of the two supply pipes 11a is opened or both are opened is appropriately determined depending on the situation in the reactor containment vessel 100b.

  Here, in an accident at a nuclear power plant, water vapor, radioactive material, and hydrogen may leak from the pressure vessel 103 to the reactor containment vessel 100b. In this case, the reactor containment vessel 100b has a high temperature and a high pressure. In this iodine removing apparatus 1, when the inside of the reactor containment vessel 100b reaches a predetermined pressure when an accident occurs, the automatic opening / closing valve 11e provided in the pipe 11 is opened before the reactor containment vessel 100b is damaged. Thereby, the gas in the reactor containment vessel 100b is supplied to the pipe 11 (supply pipe 11a) as the processing gas.

<Filter vent 13>
The filter vent 13 is provided downstream of the automatic opening / closing valve 11 e on the route of the pipe 11. The filter vent 13 may have a general configuration, and includes a tank 13a, a chemical liquid L2 stored in the tank 13a, and a metal filter 13b provided in the tank 13a.

  Among these tanks, the tank 13a is connected in communication with a supply pipe 11a extending from the reactor containment vessel 100b in the reservoir for the chemical liquid L2, and is connected to a heating pipe 15 at the upper part of the tank 13a. 11b is connected in communication.

  The chemical liquid L2 is for collecting radioactive aerosol in the gas discharged from the reactor containment vessel 100b, and is, for example, alkaline scrubber water to which sulfuric acid or sodium thiosulfate and sodium hydroxide are added.

  The metal filter 13b is disposed in parallel with the liquid surface of the chemical liquid L2 in a state of isolating the chemical liquid L2 from the connection pipe 11b. The metal filter 13b traps and collects droplets in the gas that has passed through the chemical liquid L2 and radioactive aerosol having a small particle diameter. Such a metal filter 13b has, for example, a stainless steel mesh structure, and includes a pre-filter and a main filter.

  In the filter vent 13 having such a configuration, the processing gas discharged from the reactor containment vessel 100b to the pipe 11 is first supplied into the chemical liquid L2 in the filter vent 13. Thereby, the radioactive aerosol in process gas is collected in the chemical | medical solution L2. Further, the processing gas that has passed through the chemical liquid L2 passes through the metal filter 13b disposed on the upper part of the chemical liquid L2. Thereby, the droplet in process gas and the radioactive aerosol with a small particle diameter are collected by the metal filter 13b. The processing gas that has passed through the metal filter 13b is supplied to the heat generating tank 15 through the connection pipe 11b. Although most of the radioactive substances are removed from the processing gas by passing through the filter vent 13, some of the radioactive iodine and non-condensable hydrogen and oxygen cannot be completely removed by the filter vent 13, and the connecting pipe 11b. To be discharged.

<Fever tank 15>
The heat generating tank 15 accommodates a heat generating member 15 a therein, and is disposed between the filter vent 13 and the iodine adsorption tank 17 on the route of the pipe 11. The heat generation tank 15 is provided in a state of communicating with the connection pipe 11b on the filter vent 13 side and the connection pipe 11c on the iodine adsorption tank 17 side. Then, the processing gas supplied from the connection pipe 11b on the filter vent 13 side passes through the heat generating tank 15 and is discharged to the connection pipe 11c on the iodine adsorption tank 17 side. Therefore, in order to enhance the processing effect of the processing gas in the heat generating tank 15, it is preferable that the connection pipe 11b and the connection pipe 11c are connected to the heat generating tank 15 at the farthest position.

[Heat generating member 15a]
The heat generating member 15a accommodated in the heat generating tank 15 reacts with components in the processing gas discharged from the reactor containment vessel 100b to generate heat. Here, it is assumed that the reaction heat is generated by reacting with hydrogen in the processing gas. Such a heat generating member 15a is configured using, for example, at least one of a hydrogen recombination catalyst, a metal oxide catalyst, an ammonia synthesis catalyst, and a hydrogen storage alloy.

  Among these, the hydrogen recombination catalyst is a recombination catalyst for reacting hydrogen and oxygen, and generates heat of reaction accompanying the recombination reaction between hydrogen and oxygen. As such a hydrogen recombination catalyst, metals such as palladium and platinum are used.

  The metal oxide catalyst is a recombination catalyst that causes hydrogen and oxygen to react on the surface of the metal oxide, and generates heat of reaction accompanying the recombination reaction between hydrogen and oxygen. As such a metal oxide catalyst, metal oxides such as lithium, sodium, magnesium, calcium, iron, nickel, copper, strontium, silver, and cerium are used.

  The ammonia synthesis catalyst is a catalyst that generates ammonia by reacting hydrogen and nitrogen, and generates heat of reaction accompanying the generation of ammonia. As such an ammonia synthesis catalyst, metals such as iron, molybdenum, ruthenium, and osmium are used.

  A hydrogen storage alloy is an alloy having the property of incorporating hydrogen into a crystal and generates reaction heat associated with the hydrogen storage reaction. As such a hydrogen storage alloy, metals such as lithium, magnesium, titanium, iron, nickel, and lanthanum are used.

  The heat generating member 15a configured using the material as described above is configured by, for example, attaching the above material to an inorganic carrier. As a specific example, in the case of the heat generating member 15a using palladium which is a hydrogen recombination catalyst, a heat generating member 15a having a structure in which palladium is attached to an alumina carrier and the surface is further hydrophobically coated is used. The heat generating member 15a to which the hydrophobic coating is applied in this way does not greatly reduce the heat generating performance even when water vapor flows into the heat generating tank 15.

  Such a heat generating member 15 a is filled in the heat generating tank 15. Although the filling state of the heat generating member 15a in the heat generating tank 15 is not limited, it is preferable that the heat generating member 15a is configured to exhibit high heat generation efficiency when the processing gas is supplied. Therefore, the heat generating tank 15 may be filled with the granular heat generating member 15a as it is, or a plurality of cartridges carrying the granular heat generating member 15a may be accommodated.

  The process gas that has passed through the filter vent 13 is supplied from the connection pipe 11b to the heat generating tank 15 filled with the heat generating member 15a as described above. Since this processing gas contains hydrogen, reaction heat is generated by the reaction between the heat generating member 15a in the heat generating tank 15 and hydrogen. Thereby, hydrogen in the processing gas is removed and the processing gas is heated. Then, the processing gas heated by the heat generating member 15a is supplied to the iodine adsorption tank 17 through the connection pipe 11c.

<Iodine adsorption tank 17>
The iodine adsorption tank 17 contains an iodine adsorption member 17 a inside, and is disposed on the downstream side of the heat generating tank 15 on the path of the pipe 11. The iodine adsorption tank 17 is provided in communication with the connection pipe 11c and the gas discharge pipe 11d on the heat generating tank 15 side. Accordingly, the iodine adsorption member 17a is arranged in the supply path of the processing gas heated by the reaction heat generated in the heat generating tank 15. Further, the processing gas supplied from the connection pipe 11c on the heat generating tank 15 side passes through the iodine adsorption tank 17 and is discharged to the gas discharge pipe 11d. Therefore, in order to enhance the processing effect of the processing gas in the iodine adsorption tank 17, it is preferable that the connection pipe 11c and the gas discharge pipe 11d are connected to the iodine adsorption tank 17 at the farthest position.

[Iodine adsorption member 17a]
The iodine adsorption member 17a accommodated in the iodine adsorption tank 17 adsorbs iodine in the processing gas discharged from the reactor containment vessel 100b. The iodine adsorbing member 17a used here is a solid adsorbent, and one obtained by adding silver or a silver salt to an inorganic carrier such as zeolite, ceramics, silica, or alumina is used. In addition, KI-added activated carbon in which potassium iodide (KI) is added to activated carbon, TEDA charcoal in which activated carbon is added with triethylenediamine (TEDA) are used.

  The iodine adsorption member 17a as described above is filled in the iodine adsorption tank 17. Although the filling state of the iodine adsorption member 17a in the iodine adsorption tank 17 is not limited, it is preferable that the iodine removal effect is sufficiently exerted when the processing gas is supplied. Therefore, the iodine adsorption tank 17 may be filled with the granular iodine adsorption member 17a as it is, or may contain a plurality of cartridges carrying the granular iodine adsorption member 17a.

  The iodine adsorption tank 17 filled with the iodine adsorption member 17a as described above is supplied with the processing gas heated by passing through the heat generating tank 15 from the connection pipe 11c. The iodine in the heated processing gas is adsorbed by the iodine adsorption member 17a and removed from the processing gas when passing through the iodine adsorption tank 17. Then, the processing gas from which iodine has been removed is discharged from the gas discharge pipe 11d.

<About the design of the filling amount of the heat generating member 15a and the iodine adsorbing member 17a>
Next, the filling amount of the heating member 15a in the heating tank 15 and the filling amount of the iodine adsorption member 17a in the iodine adsorption tank 17 will be described.

  First, the iodine adsorption tank 17 is filled with the iodine adsorption member 17a with a filling amount capable of adsorbing the total amount of iodine that may flow into the iodine adsorption tank 17. On the other hand, the heating tank 15 is filled so that the processing gas supplied to the iodine adsorption tank 17 can continue to heat the processing gas containing iodine to the extent that no condensation occurs in the iodine adsorption tank 17. The heating member 15a is filled in an amount. Specifically, it is as follows.

[Filling amount of iodine adsorption member 17a]
For example, it is assumed that a zeolite (silver zeolite) to which silver is attached is used as the iodine adsorption member 17a. The typical specifications of silver zeolite are as follows: proper operating temperature for iodine adsorption: 80 to 200 ° C., stability of active site: 400 ° C. or less, stability of zeolite structure: 900 ° C. or less, silver content: 12% by weight or more, pellet shape The bulk density is 720 ± 30 kg / m ³ .

In the nuclear plant 100 of a standard scale, the filling amount of the above-specified silver zeolite capable of adsorbing the total amount of iodine discharged from the reactor containment vessel 100b when an accident occurs in the nuclear plant 100 is an actual amount of 500 kg. Incidentally, an iodine adsorption tank 17 for containing the silver zeolite of the specifications of the actual amount 500 kg (iodine adsorption member 17a) is installed capacity of approximately 1 m ³ is required.

[Filling amount of heating member 15a]
There are various conditions for the processing gas discharged downstream of the filter vent 13 due to an accident event of the nuclear power plant 100. Under typical conditions, the pressure is 1 atm and the temperature is 90 ° C. or less. Further, since the processing gas discharged from the filter vent 13 is a gas containing water vapor, if the gas flows into the iodine adsorption tank 17 as it is, there is a possibility that water vapor is condensed in the iodine adsorption tank 17. Therefore, it is preferable that the iodine adsorption tank 17 is maintained at 100 ° C. or higher by the processing gas heated by the heat generating member 15a.

  As an example, a case is assumed in which the heat generating member 15a is obtained by attaching palladium to an alumina carrier and further hydrophobically coating the surface. In this case, the recombination reaction with hydrogen in the processing gas is represented by the following reaction formula (1).

H ₂ + 1 / 2O ₂ → H ₂ O + ΔH (−242 kJ / mol) (1)
ΔH: Enthalpy change

Here, when the specific heat of the silver zeolite exemplified as the iodine adsorption member 17a is 0.80 kJ / kg · K, 500 kg of the silver zeolite (iodine adsorption member 17a) is heated from 25 ° C. to 100 ° C. or more (ΔT> 75K). Requires 3 × 10 ⁴ kJ of heat. In addition, a hydrogen gas flow rate of 276 liters / minute is required to obtain heat of 3 × 10 ⁴ kJ in 10 minutes by the recombination reaction. Then, assuming that the composition of the processing gas discharged from the filter vent 13 is 91% nitrogen, 6% hydrogen, and 3% oxygen, to obtain a hydrogen gas flow rate of 276 liters / minute, the entire processing gas is about 5 m ³ / minute. The flow rate is calculated.

When the size of the reactor containment vessel 100b is about 10000 m ³ , the pressure in the reactor containment vessel 100b at the time of the accident is 0.7 MPa at the maximum. Therefore, the flow rate of the processing gas supplied from the reactor containment vessel 100b to the pipe 11 is a value that can sufficiently obtain the calculated flow rate of 5 m ³ / min.

The recombination performance of the hydrogen recombination catalyst (palladium as an example) in the heat generating member 15a is 0.05 liter / min · g. In this case, the charging amount of the heat generating member 15a is such that when a gas having a hydrogen concentration of 6% flows into the heat generating tank 15 at 5 m ³ / min, the total amount of hydrogen is recombined to 5.5 kg or more of hydrogen recombination. The heat generating member 15a containing a catalyst (palladium) is required.

<Others>
In the BWR (boiling water type) reactor 100a exemplified here, the inside of the reactor containment vessel 100b is replaced with nitrogen (N ₂ ) gas. For this reason, the processing gas supplied from the reactor containment vessel 100b to the pipe 11 has a remarkably low oxygen concentration. Therefore, if a hydrogen recombination catalyst is used for the heat generating member 15a, it is preferable to connect the oxygen supply device 19 to the pipe 11 in order to promote the recombination reaction in the heat generating member 15a. However, when the nuclear reactor is PWR or FBR, or when the heat generating member 15a uses any one of a metal oxide, an ammonia synthesis catalyst, and a hydrogen storage alloy, it is necessary to provide the oxygen supply device 19 Absent.

<Effects of First Embodiment>
As described above, the iodine removing apparatus 1 according to the first embodiment generates heat of reaction on the path of the pipe 11 between the filter vent 13 and the iodine adsorption tank 17 by reaction with the component (hydrogen) in the processing gas. It is the structure which has arrange | positioned the heat-emitting member 15a to emit. Thereby, the processing gas heated by the heat generating member 15a is supplied to the iodine adsorption tank 17 filled with the iodine adsorption member 17a, and the iodine adsorption member 17a is directly and efficiently heated by the heated treatment gas. Can do.

  Therefore, the iodine removing apparatus 1 is configured such that condensation of the processing gas hardly occurs in the iodine adsorption member 17a when the heated processing gas is supplied to the iodine adsorption member 17a. In addition, the iodine adsorbing member 17a is directly and efficiently heated by the heated processing gas, so that dew condensation hardly occurs. Moreover, the iodine adsorption member 17a is also heated to the proper operation temperature in a short time by directly and efficiently heating the iodine adsorption member 17a. In addition, the hydrogen concentration in the processing gas released from the filter vent 13 is significantly reduced by the heat generating member 15a.

  As mentioned above, according to the iodine removal apparatus 1 of 1st Embodiment, even when the nuclear power plant 100 loses all the alternating current power supplies, the dew condensation of the process gas in the iodine adsorption member 17a can be prevented effectively. , Iodine adsorption efficiency can be maintained high. As a result, the gas in the reactor containment vessel 100b can be safely released while preventing radioactive iodine from being discharged to the outside of the reactor containment vessel 100b. Moreover, the effect of safely releasing the gas in the reactor containment vessel 100b can also be obtained by reducing the hydrogen concentration in the processing gas by the heating member 15a.

<< Variation 1 of First Embodiment >>
FIG. 2 is a configuration diagram of Modification 1 of the iodine removing apparatus according to the first embodiment. 2 differs from the configuration described with reference to FIG. 1 in that the heat generating member 15a and the iodine adsorbing member 17a are provided in one process on the path of the pipe 11. The tank 21 is configured to be brought into contact with each other and accommodated therein. Other configurations are the same as those described with reference to FIG.

<Processing tank 21>
The processing tank 21 is disposed on the path of the pipe 11 between the connection pipe 11b extending from the filter vent 13 and the gas discharge pipe 11d. The heat generating member 15a is accommodated on the connection pipe 11b side in the processing tank 21, that is, on the upstream side. On the other hand, the iodine adsorbing member 17a is accommodated on the gas discharge pipe 11d side in the processing tank 21, that is, on the downstream side.

  In the processing tank 21, it is preferable that the heat generating member 15a and the iodine adsorption member 17a are provided in direct contact with each other. In addition to this, the cartridge carrying the granular heating member 15a and the cartridge carrying the granular iodine adsorbing member 17a may be arranged adjacent to each other.

  If it is the structure of such a modification 1, by having accommodated the heat generating member 15a and the iodine adsorption member 17a in the state which contacted in the inside of one process tank 21, the reaction heat which generate | occur | produced in the heat generating member 15a is an iodine adsorption member. The iodine adsorbing member 17a can be directly heated by transmitting directly to 17a. Thereby, since the heating efficiency of the iodine adsorption member 17a is further improved, it is possible to obtain a greater effect.

<< Modification 2 of the first embodiment >>
FIG. 3 is a configuration diagram of a second modification of the iodine removing apparatus according to the first embodiment. 3 differs from the configuration described with reference to FIG. 1 in that the exothermic tank 15 and the iodine adsorption tank 17 are divided into a plurality of portions on the path of the pipe 11 alternately. It is in place. Other configurations are the same as those described with reference to FIG.

  In this case, the heat generation tank 15 on the upstream side of the pipe 11 and the iodine adsorption tank 17 on the downstream side are set as one set, and the heat generation tank 15 and the iodine adsorption tank 17 are alternately arranged in series on the path of the pipe 11. .

  With the configuration of Modification 2 as described above, it is possible to suppress a decrease in heat generation performance due to poisoning of the radioactive material of the heat generating member 15a accommodated in the heat generating tank 15 disposed on the downstream side. Thereby, dew condensation of the iodine adsorption member 17a accommodated in the iodine adsorption tank 17 arrange | positioned downstream is reliably prevented, and the removal effect of iodine can be ensured.

  In addition, you may combine the structure of this modification 2 with the structure of the modification 1 demonstrated using FIG. In this case, the heat generating member 15a and the iodine adsorbing member 17a are alternately accommodated in order from the upstream side in one processing tank provided on the path of the pipe 11. Thereby, since the iodine adsorption member 17a can be directly heated by the heat of the heat generating member 15a, the heating efficiency of the iodine adsorption member 17a can be increased.

<< Modification 3 of the first embodiment >>
FIG. 4 is a configuration diagram of Modification 3 of the iodine removing apparatus according to the first embodiment. 4 differs from the configuration described with reference to FIG. 1 in that the pipe 11 is branched into a plurality of branch pipes 11-1, 11-2, and 11-3. The processing tank 21 ′ containing the heat generating member 15a and the iodine adsorbing member 17a is disposed on the path. Other configurations are the same as those described with reference to FIG.

<Branch pipes 11-1, 11-2, 11-3>
The branch pipes 11-1, 11-2, and 11-3 are branched at, for example, a connection pipe 11b extending from the filter vent 13. On the path of these branch pipes 11-1, 11-2, 11-3, a processing tank 21 'is arranged, and a gas discharge pipe 11d is connected to each processing tank 21'.

<Processing tank 21 '>
In each processing tank 21 ′, a heat generating member 15 a and an iodine adsorbing member 17 a are alternately accommodated in order from the upstream side of the pipe 11. Each processing tank 21 ′ is preferably installed with the accommodation portion of the heat generating member 15a and the accommodation portion of the iodine adsorption member 17a adjacent to each other in the adjacent processing tank 21 ′. Thereby, the heat of the heat generating member 15a is easily transmitted to the iodine adsorbing member 17a between the processing tanks 21 ′.

  In the case of the configuration of the third modified example, the pipe 11 is branched, so that the heating member 15a and the iodine adsorption member 17a provided on the path of each branch pipe 11-1, 11-2, 11-3 The flow rate of the supplied processing gas can be reduced. Thereby, it becomes possible to supply the process gas sufficiently heated in the heat generating member 15a to the iodine adsorbing member 17a, and further to perform sufficient iodine adsorption by extending the stagnation time of the process gas in the iodine adsorbing member 17a. It becomes possible to improve the removal effect of iodine.

  In addition, the branch location of the piping 11 is not limited to the connection piping 11b extended from the filter vent 13, For example, you may branch from the filter vent 13 directly. Moreover, the structure which branches the piping 11 as shown in this modification 3 is 1st Embodiment demonstrated using FIG. 1, the modification 1 demonstrated using FIG. 2, or the modification demonstrated using FIG. You may combine with the structure of Example 2, and each effect can be acquired by this combination.

<< Modification 4 of the first embodiment >>
FIG. 5 is a configuration diagram of Modification 4 of the iodine removing apparatus according to the first embodiment. 5 differs from the configuration described with reference to FIG. 1 in that the heating member 15a and the iodine are disposed in one processing tank 21 ″ provided on the path of the pipe 11. The adsorbing member 17a is housed in a mixed state, and the other configuration is the same as that described with reference to FIG.

<Treatment tank 21 ”>
The processing tank 21 ″ is disposed between the connection pipe 11b extending from the filter vent 13 and the gas discharge pipe 11d on the path of the pipe 11. The heating tank 21 ″ includes a heating member. 15a and iodine adsorbing member 17a are housed in a mixed state. Thus, the reaction heat generated in the heat generating member 15a heats the processing gas and is supplied to the iodine adsorption member 17a.

  Even in the configuration of Modification 4 as described above, the iodine adsorption member 17a is disposed in the supply path of the processing gas heated by the reaction heat generated in the heat generating member 15a. Is supplied to the iodine adsorption member 17a. Furthermore, since the reaction heat generated in the heat generating member 15a is directly supplied to the iodine adsorption member 17a, the heating efficiency of the iodine adsorption member 17a can be improved.

  In addition, you may combine the structure of this modification 4 with the structure of the modification 3 demonstrated using FIG. In this case, the processing tank 21 ″ in which the pipe 11 is branched into a plurality of branch pipes 11-1, 11-2, 11-3 and the heat generating member 15a and the iodine adsorbing member 17a are mixed and accommodated on each path is provided. Thereby, the effect of the modification 3 can be further obtained.

<< Second Embodiment >>
FIG. 6 is an example of a configuration diagram of the iodine removing apparatus 2 according to the second embodiment. The iodine removing apparatus 2 shown in FIG. 6 is a part of the pipe 11 in the processing tank 21 containing the heat generating member 15a and the iodine adsorbing member 17a in the configuration of the first modification described with reference to FIG. It is the structure which laid the heat exchanger tube 23 comprised by these.

<Heat transfer tube 23>
The heat transfer pipe 23 is configured by using a supply pipe 11 a portion between the automatic opening / closing valve 11 e and the filter vent 13 in the pipe 11. The heat transfer tube 23 is laid on at least one of the inside and the outside of the processing tank 21, and is configured to heat the processing tank 21 from the inside or the outside by the processing gas supplied to the pipe 11.

  In the illustrated example, the heat transfer tube 23 is first introduced into the processing tank 21 from the upstream side, and is laid in the accommodating portion of the heat generating member 15a and the iodine adsorbing member 17a. And the part derived | led-out from the processing tank 21 is laid in the state wound around the outer periphery of the processing tank 21, and the downstream side is the state connected to the filter vent 13 as the supply piping 11a.

<Effects of Second Embodiment>
As described above, the iodine removing apparatus 2 according to the second embodiment has a configuration in which the supply pipe 11a between the automatic opening / closing valve 11e and the filter vent 13 is laid in the processing tank 21 as the heat transfer pipe 23. As a result, the high-temperature processing gas released from the reactor containment vessel 100 b is supplied to the filter vent 13 after passing through the heat transfer tube 23 installed in the processing tank 21.

  Therefore, the heat generating member 15a and the iodine adsorption member 17a in the processing tank 21 can be preheated by heat exchange between the heat transfer tube 23 through which the high-temperature processing gas flows and the processing tank 21. As a result, the heat generating member 15a provided on the upstream side of the processing tank 21 has increased reactivity by preheating, and can generate heat of reaction by an efficient reaction. In addition, the iodine adsorption member 17a provided on the downstream side of the processing tank 21 can be heated to an appropriate operating temperature in a short time, and the adsorption efficiency of radioactive iodine can be increased.

  Further, the processing gas lowered in temperature by the previous heat exchange is supplied to the filter vent 13. For this reason, the amount of water vapor in the processing gas that has passed through the filter vent 13 can be kept low, and the processing gas having a low water vapor concentration can be supplied to the preheated processing tank 21. Also by this, the effect of preventing the occurrence of condensation in the processing tank 21 in which the iodine adsorption member 17a is accommodated can be obtained.

  The configuration of the second embodiment can be combined with the configurations of the first embodiment (FIG. 1) and the modified examples 2 to 4 (FIGS. 3 to 5). Can be obtained. Of these, as shown in FIGS. 1 and 3, when combined with a configuration in which the heat generation tank 15 and the iodine adsorption tank 17 are individually provided, at least the heat transfer tube 23 is laid on the iodine adsorption tank 17. Good. Furthermore, when combining with the structure provided with the some processing tank 21 as shown in FIG. 4, the structure by which the heat exchanger tube 23 is laid with respect to at least 1 tank may be sufficient.

«Third embodiment»
FIG. 7 is an example of a configuration diagram of the iodine removing apparatus 3 according to the third embodiment. The iodine removing apparatus 3 shown in FIG. 7 is a part of the pipe 11 in the processing tank 21 containing the heat generating member 15a and the iodine adsorbing member 17a in the configuration of the modification 1 of the first embodiment described with reference to FIG. It is the structure which laid the branch heat exchanger tube 31 which branched.

<Branched heat transfer tube 31>
The branch heat transfer pipe 31 branches from the supply pipe 11a portion at any position between the automatic opening / closing valve 11e and the filter vent 13 in the pipe 11, and is provided in parallel with the supply pipe 11a. A gas flow rate adjustment valve 33 is provided at a branch portion of the branch heat transfer pipe 31 with the supply pipe 11 a, and the flow rate of the processing gas supplied from the supply pipe 11 a to the filter vent 13 and from the branch heat transfer pipe 31 to the filter vent 13. The flow rate of the supplied processing gas is adjusted.

  A heat generating member 15 a ′ is accommodated in the branch heat transfer tube 31. As the heat generating member 15a ', one having a configuration appropriately selected from the heat generating members 15a described in the first embodiment can be used. The heat generating member 15a 'in the branch heat transfer tube 31 may be the same as or different from the heat generating member 15a housed in the processing tank 21.

  Such a branch heat transfer tube 31 is laid on at least one of the inside and the outside of the processing tank 21 in the portion between the gas flow rate adjusting valve 33 and the filter vent 13, and the processing gas supplied into the branch heat transfer tube 31. Thus, the processing tank 21 is heated from the inside or the outside.

  In the illustrated example, the branch heat transfer tube 31 is first introduced into the processing tank 21 from the upstream side, and is laid in the accommodating portion of the heat generating member 15a and the iodine adsorbing member 17a. And the part derived | led-out from the processing tank 21 is laid in the state wound around the outer periphery of the processing tank 21, and the downstream side is in the state connected to the storage part of the chemical | medical solution L2 in the filter vent 13. FIG.

<Effect of the third embodiment>
As described above, in the iodine removing apparatus 3 of the third embodiment, the branch heat transfer pipe 31 branched from the supply pipe 11a connected to the reactor containment vessel 100b is laid in the processing tank 21, and the heat generating member is provided inside. 15a ′ is filled. As a result, a part of the high-temperature processing gas released from the reactor containment vessel 100b is supplied into the branch heat transfer tube 31, and the heat generating member 15a ′ filled in the branch heat transfer tube 31 contains components (hydrogen) in the processing gas. To generate heat of reaction.

  Accordingly, the heat exchange between the branch heat transfer tube 31 filled with the high temperature processing gas and the heat generating member 15a ′ that has generated the reaction heat effectively causes the heat generating member 15a and the iodine adsorbing member 17a in the processing tank 21 to be effectively exchanged. Can be preheated. As a result, compared with the configuration of the second embodiment, the heat generating member 15a provided on the upstream side of the processing tank 21 is further enhanced in reactivity by the effective preheating, and can obtain more efficient heat generation. Can do. And it becomes possible to heat the iodine adsorption member 17a provided in the downstream of the process tank 21 to operation appropriate temperature for a further short time, and to raise the adsorption efficiency of radioactive iodine further.

  In particular, in a PWR (pressurized water type) nuclear power plant, the reactor containment vessel is not purged with nitrogen and is in an oxygen atmosphere. For this reason, it is preferable to use a hydrogen recombination catalyst as the heat generating member 15 a ′ filled in the branch heat transfer tube 31. Thereby, since it becomes possible to generate reaction heat effectively by the recombination reaction of oxygen and hydrogen inside the branch heat transfer tube 31, the design of heating the iodine adsorbing member 17a is high.

  The configuration of the third embodiment can be combined with the configurations of the first embodiment (FIG. 1) and the modified examples 2 to 4 (FIGS. 3 to 5). Can be obtained. The laying state of the branch heat transfer tube 31 when combined is a combination of the configuration of the second embodiment and the configuration of the first embodiment (FIG. 1) and any one of the second to fourth variations (FIGS. 3 to 5). It is the same as the laying state of the heat transfer tube in the case of.

<< Fourth Embodiment >>
FIG. 8 is an example of a configuration diagram of the iodine removing apparatus 4 according to the fourth embodiment. The iodine removing apparatus 4 shown in FIG. 8 is a part of the pipe 11 in the processing tank 21 containing the heat generating member 15a and the iodine adsorbing member 17a in the configuration of the modified example 1 of the first embodiment described with reference to FIG. It is the structure which laid the connection part heat exchanger tube 41 comprised by the connection piping 11b which is.

<Connection Heat Transfer Tube 41>
The connection part heat transfer tube 41 is configured by using a connection pipe 11 b portion between the filter vent 13 and the processing tank 21 in the pipe 11. A heat generating member 15a ′ is accommodated in the connection portion heat transfer tube 41. As the heat generating member 15a ′ in the connecting portion heat transfer tube 41, a member appropriately selected from the heat generating members 15a described in the first embodiment can be used. The heating member 15a ′ in the connection portion heat transfer tube 41 may be the same as or different from the heating member 15a housed in the processing tank 21.

  Such a connection portion heat transfer tube 41 is laid on at least one of the inside and the outside of the processing tank 21, and is configured to heat the processing tank 21 from the inside or outside by the processing gas supplied into the connection portion heat transfer tube 41. ing.

  In the illustrated example, the connection portion heat transfer tube 41 is laid around the outer periphery of the processing tank 21 between the filter vent 13 and the processing tank 21. Note that the connection portion heat transfer tube 41 is not limited to such a laying state, and may be introduced into the processing tank 21 and laid in the accommodating portion of the heat generating member 15a and the iodine adsorption member 17a. 21 may be laid inside and outside.

<Effects of Fourth Embodiment>
As described above, in the iodine removing apparatus 4 of the fourth embodiment, the connection pipe 11b between the filter vent 13 and the processing tank 21 is laid in the processing tank 21 as the connection portion heat transfer pipe 41, and the heat generating member is provided inside. 15a ′ is filled. As a result, the processing gas discharged from the filter vent 13 is supplied into the connection portion heat transfer tube 41, and the heat generating member 15a ′ in the connection portion heat transfer tube 41 reacts with the component (hydrogen) in the processing gas. Is generated.

  Therefore, the heat generating member 15a and the iodine adsorbing member 17a in the processing tank 21 can be effectively preheated by heat exchange with the connection portion heat transfer tube 41 filled with the heat generating member 15a ′ that has generated reaction heat. . As a result, the heat generating member 15a provided on the upstream side of the processing tank 21 is enhanced in reactivity by the effective preheating, and can efficiently generate heat. And it becomes possible to heat the iodine adsorption member 17a provided in the downstream of the processing tank 21 to operation appropriate temperature in a short time, and to improve the adsorption efficiency of radioactive iodine.

  The configuration of the fourth embodiment can be combined with the configurations of the first embodiment (FIG. 1) and other modified examples 2 to 4 (FIGS. 3 to 5), and these are combined. An effect can be obtained. The laying state of the connection portion heat transfer tube 41 in the case of combination includes the configuration of the second embodiment and the configuration of the first embodiment (FIG. 1) and any one of Modifications 2 to 4 (FIGS. 3 to 5). It is the same as the laying state of the heat transfer tube when combined.

  In addition, the structure which lays a heat exchanger tube in a process tank is not limited to the structure of 2nd Embodiment-4th Embodiment mentioned above, For example, the gas exhaust pipe 11d which is a part of piping 11 is used as a heat exchanger tube. The structure laid in the processing tank 21 may be sufficient. The heat transfer tube constituted by the gas discharge tube 11d may be filled with a heat generating member 15a '. Even in such a configuration, the heat generating member 15a and the iodine adsorbing member 17a in the processing tank 21 can be effectively kept warm by heat exchange with the heat transfer tube constituted by the gas discharge tube 11d. The same effect can be obtained.

«Fifth embodiment»
FIG. 9 is an example of a configuration diagram of an iodine removing apparatus according to the fifth embodiment. The iodine removing apparatus 5 shown in FIG. 9 has a gas circulation heat transfer tube 51 in the processing tank 21 containing the heat generating member 15a and the iodine adsorbing member 17a in the configuration of the modification 1 of the first embodiment described with reference to FIG. It is the structure which laid.

<Gas circulation heat transfer tube 51>
The gas circulation heat transfer tube 51 is configured to circulate the processing gas between the reactor containment vessel 100b described above with reference to FIG. 1 and is provided in a state where both ends thereof are communicated with the reactor containment vessel 100b. ing. On the path on one end side of the gas circulation heat transfer tube 51, an air supply pump 55 is provided via an automatic opening / closing valve 53. By the operation of the air supply pump 55, the processing gas in the reactor containment vessel 100b is introduced from one end side of the gas circulation heat transfer tube 51 and returned to the reactor containment vessel 100b again from the other end side. Yes. It is assumed that an emergency DC power supply (not shown here) is used as the power supply for the air supply pump 55.

  Such a gas circulation heat transfer tube 51 is laid on at least one of the inside and the outside of the processing tank 21, and the processing tank 21 is placed inside or outside by the processing gas circulated and supplied from the reactor containment vessel 100b into the gas circulation heat transfer tube 51. It is configured to heat from the outside.

  In the illustrated example, the gas circulation heat transfer tube 51 is first introduced into the processing tank 21 from one end side where the air supply pump 55 is provided via the automatic opening / closing valve 53, and is introduced into the accommodating portion of the heat generating member 15 a and the iodine adsorption member 17 a. Laid. And the part derived | led-out from the processing tank 21 is wound around the outer periphery of the processing tank 21, and the edge part of the two gas circulation heat exchanger tubes 51 branched into two branches is respectively connected to the reactor containment vessel 100b via the automatic opening / closing valve 57. It is in a connected state.

  Here, the automatic on-off valves 53 and 57 provided in the gas circulation heat transfer tube 51 open the gas circulation heat transfer tube 51 when the inside of the reactor containment vessel 100b rises to a predetermined pressure. The predetermined pressure at this time is lower than the predetermined pressure at which the supply pipe 11a (pipe 11) is opened by the automatic opening / closing valve 11e. Thus, the processing gas is supplied to the gas circulation heat transfer tube 51 before the processing gas is supplied from the reactor containment vessel 100b to the pipe 11. The air supply pump 55 operates simultaneously with the opening of the automatic opening / closing valves 53 and 57 to circulate the processing gas.

<Effect of Fifth Embodiment>
As described above, the iodine removing apparatus 5 of the fifth embodiment has a configuration in which the gas circulation heat transfer tube 51 that circulates the processing gas with the reactor containment vessel 100b is laid in the processing tank 21. As a result, the heat generating member 15a and the iodine adsorbing member 17a in the processing tank 21 are made effective by heat exchange with the gas circulation heat transfer tube 51 to which a high-temperature processing gas is circulated and supplied to the reactor containment vessel 100b. Can be preheated. As a result, the heat generating member 15a provided on the upstream side of the processing tank 21 is enhanced in reactivity by the effective preheating, and can efficiently generate heat. And it becomes possible to heat the iodine adsorption member 17a provided in the downstream of the processing tank 21 to operation appropriate temperature in a short time, and to improve the adsorption efficiency of radioactive iodine.

  The configuration of the fifth embodiment can be combined with the configurations of the first embodiment (FIG. 1) and other modified examples 2 to 4 (FIGS. 3 to 5), and these are combined. An effect can be obtained. The laying state of the gas circulation heat transfer tube 51 in the combination includes the configuration of the second embodiment and the configuration of the first embodiment (FIG. 1) and any one of the second to fourth variations (FIGS. 3 to 5). It is the same as the laying state of the heat transfer tube when combined.

<< Sixth Embodiment >>
FIG. 10 is an example of a configuration diagram of an iodine removing device 6 according to the sixth embodiment and a nuclear power plant 106 using the same. The iodine removing apparatus 6 shown in FIG. 10 has a configuration in which the water supply pipe 61 and the circulating drain pipe 63 are connected to the gas circulation heat transfer pipe 51 in the configuration of the fifth embodiment described with reference to FIG. 9.

<Water supply pipe 61>
The water supply pipe 61 is provided on the upstream side of the gas circulation heat transfer pipe 51 between the air feed pump 55 and the automatic opening / closing valve 57 with one end connected via a valve 61a. The other end of the water supply pipe 61 is bifurcated. The other end of the bifurcated branch is connected to a storage portion of the cooling water L1 in the pressure suppression pool of the nuclear reactor containment vessel 100b via a valve 61b. The other end branched into two branches is connected to a storage part for external cooling water L3 in the emergency condenser S via a valve 61b. The external cooling water L3 may be seawater.

  In such a water supply pipe 61, a water supply pump 61c is provided so that the cooling water L1 and the external cooling water L3 are supplied to the gas circulation heat transfer pipe 51. In addition, the emergency DC power supply which abbreviate | omitted illustration here shall be used for the power supply of the water supply pump 61c.

<Circulating drain pipe 63>
One end of the circulation drain pipe 63 is connected to the downstream side of the gas circulation heat transfer pipe 51 between the air feed pump 55 and the automatic opening / closing valve 57 via a valve 63a. The other end of the circulation drain pipe 63 is bifurcated. The other end branched into two branches is connected to the reactor containment vessel 100b through a valve 63b. The other end branched into two branches is connected to the emergency condenser S through a valve 63b.

<Effects of Sixth Embodiment>
The iodine removing apparatus 6 of the sixth embodiment having such a configuration has a configuration in which a water supply pipe 61 and a circulating drain pipe 63 are connected to a gas circulation heat transfer pipe 51 laid in the processing tank 21. Thereby, the cooling water L1 of the reactor containment vessel 100b or the external cooling water L3 in the emergency condenser S can be circulated in the gas circulation heat transfer tube 51. In this case, first, the automatic open / close valves 53 and 57 of the gas circulation heat transfer tube 51 are closed and the air supply pump 55 is stopped. Thereafter, the valves 61 a and 61 b of the water supply pipe 61 and the valves 63 a and 63 b of the circulation drain pipe 63 are opened, and the water supply pump 61 c of the water supply pipe 61 is operated.

  Thereby, when the temperature of the iodine adsorption member 17a filled in the processing tank 21 is equal to or higher than the iodine adsorption operation proper temperature, the cooling water is supplied into the gas circulation heat transfer pipe 51 through the water supply pipe 61 and the circulation drain pipe 63. L1 or external cooling water L3 is circulated and supplied. At this time, if only the cooling water L1 of the pressure suppression pool is to be circulated and supplied, only the valve on the reactor containment vessel 100b side among the valve 61b of the water supply pipe 61 and the valve 63b of the circulation drain pipe 63 is opened. On the other hand, if it is desired to circulate and supply only the external cooling water L3 of the emergency condenser S, only the valve on the emergency condenser S side among the valve 61b of the water supply pipe 61 and the valve 63b of the circulation drain pipe 63 is provided. open.

  The iodine adsorbing member 17a can be cooled to an appropriate operating temperature by circulating supply of the cooling water L1 or the external cooling water L3 into the gas circulation heat transfer tube 51 as described above.

  In addition, this invention is not limited to above-described embodiment and modification, Furthermore, various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1,1a, 1b, 1c, 1d, 2,3,4,5,6 ... Iodine removal apparatus, 11 ... Piping, 11a ... Supply piping (pipe), 11b, 11c ... Connection piping (piping), 11d ... Gas discharge Tube (pipe), 13 ... filter vent, 15a ... heating member, 17a ... iodine adsorption member, 23 ... heat transfer tube, 31 ... branch heat transfer tube, 41 ... connection heat transfer tube, 51 ... gas circulation heat transfer tube, 100a ... reactor , 100b ... Reactor containment vessel, 100, 106 ... Nuclear power plant

Claims (5)

A pipe to which a processing gas containing radioactive iodine is supplied;
A filter vent disposed on the path of the pipe;
A heating member disposed on the downstream side of the filter vent on the piping path and generating reaction heat by reacting with a component in the processing gas;
An iodine adsorbing member disposed in a supply path of the processing gas heated by the reaction heat,
A heat transfer tube to which the processing gas is supplied is laid in a portion where the iodine adsorbing member is disposed on the route of the piping,
The heat transfer tube is constituted by a part of the piping,
A heat generating member that reacts with a component in the processing gas to generate reaction heat is accommodated in the heat transfer tube.
Radioactive iodine removal apparatus. The iodine adsorbing member is disposed on the downstream side of the heat generating member on the piping path,
The heat generating member and the iodine adsorbing member are alternately arranged along the route of the pipe.
The radioactive iodine removal apparatus of Claim 1 . The heating and the member and the iodine adsorption member, radioactive iodine removal apparatus according to claim 1 or 2 arranged in adjacent state. The radioactive iodine removing apparatus according to any one of claims 1 to 3 , wherein the heat generating member is configured using any one of a hydrogen recombination catalyst, a metal oxide catalyst, an ammonia synthesis catalyst, and a hydrogen storage alloy. The radioactive iodine removal apparatus as described in any one of Claims 1-4 ,
A nuclear reactor,
A reactor containment vessel containing the reactor,
The nuclear power plant in which the reactor containment vessel and the piping of the radioactive iodine removal device are connected, and the processing gas is supplied from the reactor containment vessel to the piping of the radioactive iodine removal device.

Images