KR102014967B1 - Corrosion prevention method of spent nuclear fuel canister using sacrificial anode method and its application - Google Patents

Abstract

According to the present invention, a corrosion prevention method of a spent nuclear fuel canister and an application method thereof are applied with a sacrificial anode method to predict a case in which a problem may occur. Therefore, the canister can be semi-permanently operated by missing a replacement time of magnesium.

Description

Corrosion prevention method of spent nuclear fuel canister using sacrificial anode method and its application}

The present invention relates to a method of preventing corrosion of a spent fuel canister and its application.

Nuclear waste, such as high-level waste and spent fuel, which are unavoidable from the nuclear industry, must be safely isolated from the ecosystem for a long time. One of the engineering barriers for this purpose, the canister, can usually be made of a single or alloy material. France, the United Kingdom, and Japan are considering making high-level wastes into glass solids and putting them back in other containers.In Canada, Germany, Finland, and Sweden, they put spent fuel directly into containers. Considering how to pack. In the United States, individual disposal containers for two types of free solids and spent fuel are envisioned. Korea is pursuing the concept of disposing of spent fuel in the core layer, for example, placing the disposal container vertically in a deep crystalline rock of 500 m depth and filling it with compressed bentonite.

However, as described above, the disposal cave constructed in the rock more than 500 m underground to dispose of the disposal container including spent fuel has a water pressure of 50 atm or more due to groundwater and a swelling pressure of 100 atm or more due to the buffer material filled to protect the disposal container. Can be. Therefore, the disposal container should have a structural stability to withstand such pressure. In addition, it should be possible to semi-permanently suppress the release of radionuclides present in spent fuel into the environment.

Therefore, various researches are needed to prevent problems caused by various corrosive environments that can come into contact with groundwater and to ensure long-term structural stability of disposal containers.

Specifically, in order to safely isolate nuclear waste contained in the disposal container from the ecosystem for a long time, corrosion of the disposal container must be prevented at the source. In particular, when the disposal container is a metal material, the metal is strong against external impact and has excellent structural stability, but has a disadvantage of being vulnerable to corrosion by an oxidation reaction. Accordingly, there is a fatal problem in that the disposal container of metal material buried underground having a high oxidizing environment cannot safely isolate spent fuel from an ecosystem.

For this reason, there is a need for a fundamental solution to the problem that metal containers are oxidized and corroded so that nuclear waste can be completely isolated from the ecosystem.

KR10-2006-0015370A (2006.02.17)

It is an object of the present invention to provide a method of preventing corrosion of a spent fuel canister and its application method that can be semi-permanently operated without missing a replacement time of magnesium in anticipation of a problem may occur in advance.

A specific object of the present invention is to prevent corrosion of the canister of a metal material in consideration of various environmental variables that may cause corrosion, and to prevent corrosion of a spent fuel canister that can be semi-permanently operated by securing structural stability of the canister. It is to provide a method and its application method.

Another specific object of the present invention can be operated by minimizing the amount of magnesium used to prevent oxidation of the spent fuel canister, nevertheless can be used semi-permanently by preventing the canister of the metal material is oxidized and corroded It is to provide a method for preventing corrosion of the post-fuel canister and its application.

Another specific object of the present invention is based on data obtained from spent fuel canisters installed in existing locations, and in the operation of spent fuel canisters installed in new locations, the canisters of metallic materials are minimized while minimizing the amount of magnesium used. The present invention provides a method and system for preventing corrosion of spent fuel canisters that can be operated semi-permanently by preventing oxidation and corrosion.

Another specific object of the present invention is to provide a method and system for preventing corrosion of spent fuel canisters capable of operating a large-scale system including a plurality of canisters.

Corrosion preventing method of the spent fuel canister using the sacrificial anode method according to the invention, the canister of a metal material in which the spent fuel is stored therein; And a sacrificial anode portion connected to the canister, wherein the metal material of the canister includes any one or more selected from copper, iron, and the like, and the sacrificial anode portion includes magnesium metal.

In one embodiment of the present invention, the canister, the outer protective canister of a copper metal material; And an inner canister located in the outer protection canister, the inner canister of ferrous metal material including a spent fuel accommodation space.

In one embodiment of the present invention, the thickness of the outer protective canister may be 5 mm or more.

In one example of the present invention, the spent fuel receiving space may be partitioned into a plurality of partitions to accommodate one or more spent fuel.

In one embodiment of the present invention, the outer protective canister may include an external opening and closing to allow the spent fuel is contained therein and sealed.

In one embodiment of the present invention, the canister may be buried underground, the sacrificial anode portion may be located above ground or underground.

In one embodiment of the present invention, the canister may include a plurality of unit canisters.

According to the present invention, a monitoring system for preventing corrosion of a spent fuel canister, including a method of preventing corrosion of a spent fuel canister using the sacrificial anode method, includes: a resistance measuring unit measuring a resistance value of an external protective canister; A resistance receiver for receiving a resistance value from the resistance measurer in real time; And an external server configured to receive a resistance value from the resistance receiver.

Monitoring system for preventing corrosion of spent fuel canister according to the present invention, the humidity sensor unit is provided on the outside of the outer protective canister for measuring the external humidity of the outer protective canister; And a humidity receiver configured to receive the humidity value measured by the humidity sensor in real time. The external server may receive a humidity value from the humidity receiver.

Monitoring system for preventing corrosion of spent fuel canister according to the present invention, the temperature sensor unit for measuring the temperature of the external protective canister; And a temperature receiver configured to receive the temperature value measured by the temperature sensor in real time. The external server may receive a temperature value from the temperature receiver.

Monitoring system for preventing corrosion of spent fuel canister according to the present invention, pH sensor unit for measuring the external pH of the external protective canister is provided on the outside of the external protective canister; And a pH receiver configured to receive the external pH value measured from the pH sensor in real time. The external server may receive a pH value from the pH receiver.

In one example of the present invention, the external server may accumulate and store a resistance value, a humidity value, a temperature value, and a pH value in a database, and calculate the stored values statistically to predict the corrosion protection period of the spent fuel canister. Can be.

According to the present invention, a method of predicting the life of a spent fuel canister using a sacrificial anode method using a monitoring system for preventing corrosion of the spent fuel canister is based on the amount of magnesium metal used for each installation location of the canister from an external server unit. Predicting a corrosion protection period of the canister.

In the method of installing the spent fuel canister according to the present invention, the method of predicting the minimum usage content of magnesium metal according to the required corrosion protection period for each installation site of the canister through the method of predicting the life of the spent fuel canister to which the sacrificial anode method is applied It may include the step of installing the sacrificial anode portion by applying the minimum amount of the use of the magnesium metal and embedding the spent fuel canister underground.

In the method of installing the spent fuel canister according to an embodiment of the present invention, the sacrificial anode portion may be buried underground adjacent to the spent fuel canister.

Corrosion prevention method and its application method of the spent fuel canister according to the present invention has an effect that can be semi-permanent operation without missing the replacement time of magnesium in anticipation of a problem may occur in advance.

Specifically, the method for preventing corrosion of the spent fuel canister and its application method according to the present invention prevents the problem of oxidation of the canister of a metal material in consideration of various environmental variables that may cause corrosion, and improves the structural stability of the canister. It is possible to secure and operate semi-permanently.

In addition, the method of preventing corrosion of the spent fuel canister and its application method according to the present invention can be operated by minimizing the amount of magnesium used to prevent oxidation of the spent fuel canister, and the metal canister is oxidized and corroded. It is possible to operate semi-permanently by preventing the problem.

In addition, the method for preventing corrosion of the spent fuel canister and its application method according to the present invention is based on the data obtained from the spent fuel canister installed in the existing location, and the magnesium used in the operation of the spent fuel canister installed in the new location. By minimizing the amount of use of the canister of the metal material to prevent the problem of oxidized and corroded, it is possible to operate semi-permanently.

In addition, the method for preventing corrosion of the spent fuel canister and its application method according to the present invention has the effect of operating a large-scale system including a plurality of canisters.

Even if the effects are not explicitly mentioned in the present invention, the effects described in the specification and the inherent effects expected by the technical features of the present invention are treated as described in the specification of the present invention.

1 is a view showing a canister according to the present invention.
2 conceptually illustrates a structure in which a plurality of canisters according to the present invention is connected.
Figure 3 shows a conceptual diagram of a monitoring system and its application method for preventing corrosion of spent fuel canister according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the corrosion prevention method and the application method of the spent fuel canister according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings described herein are provided by way of example in order to fully convey the spirit of the invention to those skilled in the art. Therefore, the present invention is not limited to the drawings presented and may be embodied in other forms, and the drawings may be exaggerated to clarify the spirit of the present invention.

Unless otherwise defined in the technical and scientific terms used herein, it has the meaning commonly understood by those of ordinary skill in the art to which this invention belongs, and the gist of the invention in the following description and the accompanying drawings. The description of well-known functions and configurations that may unnecessarily obscure them will be omitted.

As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the specification indicates otherwise.

Corrosion preventing method of the spent fuel canister using the sacrificial anode method according to the invention, the canister of a metal material in which the spent fuel is stored therein; And a sacrificial anode portion connected to the canister. In this case, the metal material of the canister includes any one or more selected from copper and iron, and the sacrificial anode part includes magnesium metal. As the sacrificial anode method is used in the present invention, electrons are continuously supplied to the metal material until no more electrons are supplied from the magnesium metal to maintain the reduced state. Therefore, even if the surrounding environment of the canister has a high oxidizing atmosphere, it is possible to prevent corrosion due to oxidation of the metal material. In this case, the metal material may further include nonmetallic elements such as carbon and nitrogen.

The canister includes: an outer protective canister of a first metal material; And an inner canister of a second metal material positioned inside the outer protective canister and including a spent fuel receiving space, an example of which is illustrated in FIG. 1.

The first metal material may include copper, and the second metal material may include iron. Iron canisters are excellent in mechanical properties, impact resistance and structural stability, but relatively more susceptible to corrosion problems by oxidation, copper canisters are relatively less susceptible to corrosion problems by oxidation. Therefore, the steel canisters with excellent structural stability are located inside the canisters of copper material, which are less susceptible to corrosion, so that the steel canisters are not directly exposed to an external oxidizing environment, thereby improving structural stability and preventing corrosion by oxidation. Can be further suppressed. In a preferred embodiment, the canister may include an outer protective canister made of copper metal; And an inner canister located in the outer protection canister, the inner canister of ferrous metal material including a spent fuel accommodation space. However, this is only described as a preferred example, of course, the present invention is not limited thereto.

The thickness of the outer protective canister may be more than enough to ensure the required structural stability, for example 5 mm or more, specifically 5 to 50 mm, more specifically 5 to 20 mm. However, this is only a specific example, and the present invention is not limited thereto.

The spent fuel accommodating space is a space in which the spent fuel is accommodated, and may have various structures in which the spent fuel can be accommodated. For example, the spent fuel accommodating space may be partitioned into partitions to accommodate one or more spent fuel. have. At this time, the size, shape and the like of the partition and the partitioned space may be appropriately adjusted by a person skilled in the art, so it is not limited.

The outer protective canister may include an external opening and closing portion to allow the spent fuel to be contained therein and sealed. As shown in FIG. 1, spent fuel is charged into the inner space of the inner canister and the inner opening and closing portion is coupled to the inner canister to be completely sealed. The inner canister is also housed in the inner space of the outer protective canister and the outer opening is coupled to the outer protective canister to be hermetically sealed. Such double sealed canisters are buried in places such as underground or caves, whereby spent fuel can be substantially blocked from the ecosystem. In this case, the coupling may be performed by using various sealing means such that a liquid such as water, water vapor, oxygen, or the like cannot be introduced into the canister. For example, welding means may be used.

As described above, the canister may be located (buried) in a place that is easily blocked from ecosystems such as submarine tunnels, underground, caves, etc. In addition to this, various places that can be isolated from the ecosystem may be selected, but are not limited thereto. . In addition, there are various known transportation methods for positioning the canister, which may be referred to.

The sacrificial anode portion may be located at a place spaced from or adjacent to the canister, and specifically, may be located above or below ground. The anti-oxidation effect of the canister using the sacrificial anode is not realized when the oxidation of the magnesium metal of the sacrificial anode proceeds a lot and the electron providing ability is lost or reduced. Therefore, the magnesium metal should be replaced after a certain time. As a non-limiting example, when the sacrificial anode portion is located on the ground, the exchange of magnesium metal may be easy. In addition, as a non-limiting example, when the sacrificial anode portion is located adjacent to the basement with the canister, it is possible to block the possibility of problems caused by human intrusion (source). In this case, magnesium metal may be used in such an amount that the replacement of magnesium metal is not substantially required.

Since spent fuel canisters cannot be housed indefinitely in one location, the location must also be continuously established as long as new spent fuel canisters that need to be relocated are continually generated.

As shown in FIG. 2, the canister may include a plurality of unit canisters, and a plurality of unit canisters may be located in one place and may be located in another place.

Similarly, the sacrificial anode portion connected to the canister may include a plurality of sacrificial anode portions, and the plurality of sacrificial anode portions may be located at one place and may be located at another place.

The unit canister may be connected to the sacrificial anode part in various ways, and preferably, may be connected to each other in parallel with each other as shown in FIG. 2.

The connection may be made through various materials through which electricity may flow. For example, the connection may be connected by wire through a conductive wire such as copper or iron. In addition, the canister and the sacrificial anode part may be connected by a single wire. In addition, the canister and the sacrificial anode part may be connected to two or more conductors such as a double conductor in order to minimize the probability of disconnection of electrons due to disconnection due to external impact or weather resistance. In this case, two or more wires may be connected in parallel.

The sacrificial anode portion is not limited so much if the magnesium metal is a means for supplying electrons to the canister, but is not particularly limited, it is preferable that the space in which the magnesium metal is located is a space that excludes the electrons other than the canister. As a specific example, a sealed space in which an oxidant such as O ₂ , O ₃ , H ₂ O may be excluded is preferable. As a means for this, the sacrificial anode part is one in which magnesium metal is charged in a sealed container in which the oxidizing agent is excluded. Can be. At this time, the magnesium metal is connected to the canister by a wire.

As described above, in the method for preventing corrosion of spent fuel canister according to the present invention, as the sacrificial anode method is used, as long as magnesium metal can continuously supply electrons, electrons are continuously supplied and reduced to the metal material of the canister. Maintain state. Therefore, even if the surrounding environment of the canister has a high oxidizing atmosphere, there is an effect that can prevent the corrosion by the oxidation of the metal at the source.

However, this is a possible effect when the magnesium metal of the sacrificial anode portion can continuously supply electrons, and it must be assumed that the magnesium metal continuously supplies electrons. Therefore, in reality, it is necessary to use more than the necessary magnesium metal, there is a problem that it is difficult to use the amount of magnesium suitable for the surrounding environment of the canister.

Accordingly, in the present invention, it is possible to implement the effect of preventing the source of corrosion, while preventing the oxidation and corrosion of the canister during the required period, and in order to replace the magnesium metal in a timely manner in preparation for the problem of oxidation of the canister in advance. It also provides a monitoring system for corrosion protection of spent fuel canisters.

The corrosion of metal materials in canisters varies greatly depending on the surrounding environment. Specifically, oxidation of the metal material is greatly influenced by the surrounding environment such as humidity, temperature, pH, and the like. That is, when the metal material of the canister is oxidized and corroded, the electrical resistance of the metal material increases, and the oxidation rate of the metal material increases and decreases according to the surrounding environment. However, it is practically impossible to exclude such an oxidizing environment, and it is also difficult to control oxidizing factors such as humidity value, temperature value and pH value. In addition, in some cases, since the sacrificial anode portion may be far from the canister, a problem occurs in that the amount of electrons per unit time supplied to the canister is reduced from the theoretical value. In addition, since the wires connecting the sacrificial anodes and the canisters age over time, the problem may be accelerated over time.

Therefore, in the monitoring system for preventing corrosion of spent fuel canisters according to the present invention, the resistance value of the canister metal material is measured and acquired in real time, and the degree of oxidation and corrosion of the actual canister is monitored based on the resistance value. The canister's surroundings can be monitored continuously.

Since the surrounding environment of the canister affects the degree of corrosion of the canister metal material, the resistance value of the canister metal material may increase as the oxidation of the metal material proceeds. That is, the corrosion level of the canister can be measured by monitoring environmental information such as resistance value of the canister metal material.

Specifically, the monitoring system for corrosion prevention of spent fuel canister according to the present invention includes a method for preventing corrosion of the spent fuel canister. The system includes a resistance measuring unit for measuring a resistance value of the external protective canister; A resistance receiver for receiving a resistance value from the resistance measurer in real time; And an external server configured to receive a resistance value from the resistance receiver.

As the resistance value of the canister metal material measured in real time is accumulated and stored, the external server unit may quantitatively monitor the oxidation progress and the oxidation progress of the canister metal material. In particular, as the degree of corrosion of the canister can be quantitatively monitored at each location, it is possible to accurately predict the period of corrosion protection and the replacement time of magnesium metal.

The resistance measuring unit may be used as long as it can measure the resistance of the metal material of the external protective canister, which may be referred to the known literature, so is not limited.

The resistance receiver may be provided adjacent to the canister, or may be provided away from another place such as the ground. In this case, the resistance receiving unit may be connected to the resistance measuring unit through a wire.

Furthermore, as will be described later, as the external server unit can acquire environmental information such as resistance value, humidity value, temperature value, pH value, and the like, the corrosion prevention period and replacement time of magnesium metal can be predicted more precisely. As a specific example, as shown in FIG. 1, the external server may store environmental information such as a resistance value, a humidity value, a temperature value, and a pH value from each receiver.

Specifically, the monitoring system for corrosion protection of spent fuel canister according to the present invention is the resistance value, temperature value, humidity value, pH value, etc. through environmental variables such as canister resistance, canister temperature, ambient humidity, and ambient pH. You can learn the environment information in real time. In addition, by calculating statistically based on the environmental information, it is possible to more accurately predict the corrosion protection period and the replacement time of magnesium metal according to the place.

In one preferred embodiment, the monitoring system for preventing corrosion of the spent fuel canister according to the present invention, the humidity sensor unit provided on the outside of the outer protective canister to measure the external humidity of the outer protective canister; And a humidity receiver configured to receive the humidity value measured by the humidity sensor in real time. The external server may receive a humidity value from the humidity receiver. Humidity is a very effective factor for accelerating the oxidation of the metal material, and since the oxidation of the metal material occurs rapidly above a certain humidity, the resistance value of the metal material may change greatly according to the change in humidity. Therefore, it is possible to more accurately predict the corrosion protection period and the replacement time of magnesium metal according to the place through statistical calculation based on environmental information including humidity together with the resistance value.

As a preferred example, the monitoring system for preventing corrosion of the spent fuel canister according to the present invention, the temperature sensor unit for measuring the temperature of the external protective canister; And a temperature receiver configured to receive the temperature value measured by the temperature sensor in real time. The external server may receive a temperature value from the temperature receiver. The temperature is an effective factor for accelerating the oxidation of the metal material. As the temperature increases, the water vapor pressure increases, the contact time and the amount of contact between the metal material and the H ₂ O increase and cause faster oxidation of the metal material. Therefore, the resistance value of the metal material may change significantly with the change of temperature. Therefore, it is possible to more accurately predict the corrosion protection period and the replacement time of magnesium metal according to the place through statistical calculation based on the environmental information including the temperature together with the resistance value.

As a preferred example, the monitoring system for preventing corrosion of spent fuel canister according to the present invention, the pH sensor unit which is provided on the outside of the outer protective canister for measuring the external pH of the outer protective canister; And a pH receiver configured to receive the external pH value measured from the pH sensor in real time. The external server may receive a pH value from the pH receiver. pH is also an effective factor affecting the oxidation of the metal material, the oxidation of the metal material may be accelerated or decelerated depending on the interval of the surrounding pH. Therefore, the resistance value of the metal material may change according to the change of the surrounding pH. Therefore, it is possible to more accurately predict the corrosion protection period and the replacement time of the magnesium metal according to the place through statistical calculation based on the environmental information including the surrounding pH together with the resistance value. The pH refers to a surrounding pH including a liquid, a solid, or a gas existing in the outside of the canister. When the canister is buried underground, the pH may refer to the pH of the underground soil in contact with the outer surface of the canister.

As described above, the external server unit may accumulate and store a resistance value, a humidity value, a temperature value, and a pH value, and may database the same. Thus, based on the database, statistical calculations can be used to calculate the appropriate magnesium metal usage content of canisters installed in new locations, even if the values for those sites are missing or not sufficiently accumulated, corrosion protection period and magnesium replacement. Predict the timing.

That is, the present invention can provide a method of predicting the life of the spent fuel canister to which the sacrificial anode method is applied, and can also provide a method of installing the spent fuel canister.

According to the present invention, the method of predicting the life of a spent fuel canister to which the sacrificial anode method is applied may be performed using a monitoring system for preventing corrosion of the spent fuel canister. Specifically, the prediction method may include estimating the corrosion protection period of the canister according to the use amount of magnesium metal for each installation location of the canister from the external server unit.

The method of installing the spent fuel canister according to the present invention includes estimating the minimum usage content of magnesium metal according to the required corrosion protection period for each installation site of the canister through the life prediction method, and applying the minimum usage content of the magnesium metal. And installing the sacrificial anode portion and installing the spent fuel canister. As a preferred example, the step of installing the spent fuel canister may be a step of embedding the spent fuel canister underground.

In the method of installing the spent fuel canister according to an embodiment of the present invention, the sacrificial anode portion may be buried underground adjacent to the spent fuel canister.

As described above, using the above methods, even in the case of installing the canister and / or sacrificial anode part in a new place, the place can be operated efficiently and efficiently without initial construction of a database including the environmental information of the new place. The effect is that you can build your database in the future.

Furthermore, if the database is secured with sufficient environmental information and resistance values, the entire canisters can be isolated from the ecosystem more reliably, efficiently, and effectively without corrosion through deep learning in which these data are accumulated.

The location of the external server unit is not particularly limited, but may preferably be located away from the canister, specifically, on the ground. In addition, the external server unit or the receiving unit may include a time-specific value such as a previous value (value before correction) is accumulated and stored.

In one embodiment of the present invention, the method or system may be applied with an external power method, specifically, a power supply connected to the external protection canister; And a voltage controller configured to apply a voltage to the power supply when the resistance value received from the resistance receiver exceeds a first resistance setting value. Therefore, when the magnesium metal needs to be replaced but is impossible or when the electron supply by the magnesium metal is not smooth, electrons can be continuously supplied to the canister without interruption. In this case, the first resistance setting value may be set to a resistance value when the oxidation of the canister is continued because electron supply by the magnesium metal is not smooth.

In an example of the present disclosure, the voltage controller increases the applied voltage value applied to the power supply unit when the resistance value received from the resistance receiver exceeds a second resistance setting value, and the resistance value is increased by a second value. When the resistance is less than the set value, the first logic operation may be performed to decrease the applied voltage value. This allows the system to be operated at a voltage very close to the required minimum resistance value at which the canister does not corrode, reducing the maintenance cost associated with power consumption. In this case, the second resistance setting value may be set to a resistance value when oxidation of the canister is continued.

In one embodiment of the present invention, when the humidity value received from the humidity receiver exceeds the humidity setting value, the voltage control unit adjusts the second resistance setting value corrected by reflecting the humidity value in the second resistance setting value. Applicable In addition, when the temperature value received from the temperature receiver exceeds the temperature set value, the voltage controller may apply the second resistor set value corrected by reflecting the temperature value to the second resistor set value. In addition, when the pH value received from the pH receiver exceeds the pH set value, the voltage controller may apply the second resistance set value corrected by reflecting the pH value to the second resistance set value.

In one embodiment of the present invention, the external server may be further received with the applied voltage value with the environmental information. In detail, the external server unit may receive the environmental information and the applied voltage values, and accumulate and store the environmental information and the applied voltage values in a database. Accordingly, the external server may control the voltage controller by calculating each value statistically. This enables efficient implementation of the above effects even when a canister is to be installed in a new place where there is no data information. In addition, there is an effect that the database of the place can be built in the future while operating effectively and efficiently without the initial construction of a database containing the environmental information of the place.

In one embodiment of the present invention, the external server unit receives respective information from each voltage control unit or each receiver of a plurality of unit spent fuel canisters located in different places, the applied voltage value of the unit voltage control unit of each place The average voltage value obtained by calculating statistically can be stored. In addition, the external server may control the voltage controller to apply the average voltage value to the initial applied voltage value of the newly installed unit canister. This makes it possible to operate with the appropriate minimum resistance value, while significantly reducing the energy consumption required for the first logical operation per unit canister while effectively preventing corrosion of the canister.

In one embodiment of the present disclosure, the external server unit may control the voltage controller to stop the first logic operation when the increase rate of the resistance value received from the resistance receiver for the newly installed unit canister is less than a set resistance increase rate value. have. In addition, when the increase rate of the resistance value exceeds the set resistance increase rate value, a second logic operation for controlling the voltage controller to perform the first logic operation may be performed. Therefore, since the first logical operation does not need to be calculated in real time in each voltage control unit for each unit canister, there is an effect suitable for operating a large-scale system without consuming large energy until a special problem occurs in a specific unit canister. That is, it is possible to control whether or not the voltage controller performs the first logical operation through the second logic operation in the external server without continuously performing the first logical operation of each voltage controller.

In this case, the set resistance increase rate may be a value exceeding zero, and may be set as an appropriate range in which corrosion due to oxidation of the canister is not caused.

As described above, the second logical operation may be repeated in the external server unit, and the first logical operation may be re-executed only in the unit canister having a problem. In addition, when the first logic operation is repeatedly performed in the voltage control unit of the problem unit canister, the second logic operation on the problem unit canister is suspended in the external server unit. Furthermore, if a sufficient database of environmental information and voltage values is obtained from the unit canister in which the problem occurs, the first logical operation may be stopped and the second logical operation, which has been suspended, may be re-executed. Through deep learning that accumulates data, the entire canisters can be operated efficiently and reliably and efficiently.

In one example of the present invention, the canister may be buried underground, the power supply and the external server may be located on the ground independently of each other.

110: external protective canister, 111: external opening,
120: internal canister, 121: internal opening and closing,
122: bulkhead

Claims (13)

A canister comprising a plurality of unit canisters including an outer protective canister of a copper metal material and an inner canister of a ferrous metal material located inside the outer protective canister and including spent fuel receiving space; And
A monitoring system of a spent fuel canister for predicting replacement time of a sacrificial anode portion metal, comprising: a sacrificial anode portion connected to the plurality of unit canisters and including magnesium metal.
The canister is buried underground
The sacrificial anode portion is located at or away from the canister, the replaceable magnesium metal,
The monitoring system,
A power supply unit connected to the unit canister;
A voltage control unit applying a voltage to the power supply unit when the resistance value of the unit canister exceeds a first resistance setting value; And
Accumulate and store the resistance value, humidity value, temperature value and pH value of the unit canister and the applied voltage value in the power supply unit, and calculate the stored values statistically to predict the corrosion protection period of the spent fuel canister. An external server unit that includes;
The spent fuel for predicting the replacement time of the sacrificial anode portion metal, characterized in that to predict the use time of the magnesium metal of the sacrificial anode portion of each installation location of the canister from the external server unit, the replacement time of the magnesium metal Canister monitoring system. delete The method of claim 1,
Monitoring system of spent fuel canister for predicting replacement time of sacrificial anode metal, wherein the outer protective canister has a thickness of 5 mm or more. The method of claim 1,
The spent fuel canister space is divided into a plurality of partitions to accommodate one or more spent fuel, monitoring system of the spent fuel canister for predicting when to replace the sacrificial anode metal. The method of claim 1,
The outer protective canister includes an external opening and closing to allow the spent fuel to be contained therein, the monitoring system of the spent fuel canister for predicting the replacement time of the sacrificial anode metal. delete delete The method of claim 1,
A resistance measuring unit measuring a resistance value of the external protective canister; And
And a resistance receiver configured to receive a resistance value from the resistance measurer in real time.
And the external server unit monitors the spent fuel canister for predicting replacement time of the sacrificial anode part metal, in which a resistance value is received from the resistance receiver. The method of claim 1,
A humidity sensor unit provided outside the external protection canister to measure external humidity of the external protection canister; And
And a humidity receiver for receiving the humidity value measured from the humidity sensor in real time.
And the external server unit monitors the spent fuel canister for predicting a replacement time of the sacrificial anode part metal, in which a humidity value is received from the humidity receiver. The method of claim 1,
A temperature sensor unit measuring a temperature of the external protective canister; And
And a temperature receiver configured to receive the temperature value measured by the temperature sensor in real time.
And the external server unit monitors the spent fuel canister for predicting the replacement time of the sacrificial anode metal where the temperature value is received from the temperature receiver. The method of claim 1,
A pH sensor unit provided outside the outer protective canister to measure an external pH of the outer protective canister; And
And a pH receiver for receiving the external pH value measured from the pH sensor in real time.
And the external server unit monitors spent fuel canister for predicting replacement time of the sacrificial anode metal where the pH value is received from the pH receiver. delete delete

Images