JPH11166999A - Calorific value measuring device - Google Patents

Abstract

(57) [Summary] [Problem] To measure the calorific value in a state temporarily placed for other inspections and measurements, thereby shortening the entire inspection measurement time including other inspections and measurements, and measuring items. Provided is a calorific value measuring device which has a small amount of heat and can be measured simply and with high accuracy. SOLUTION: A support base 16 for mounting a canister 2 on a temporary storage pit 11 is provided, and a partition wall 1 provided around the support base 16 is provided.
4 to partition 13 into canister 2,
The orifice 17 is provided so that the flow rate of the air 15 flowing through the section 13 is constant, the flow rate flowing through each section 13 is known from the total amount of air, and the air inlet temperature and the outlet temperature of each section 13 are measured with the temperature diameters 18 and 19. . In this way, the calorific value can be easily obtained by the computer 20 by using the temporary storage time only by measuring the temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calorific value measuring device, and inspects and measures the calorific value of a vitrified sealed container containing high-level radioactive waste generated at the time of fuel reprocessing at a nuclear facility. The measurement can be performed easily and with high accuracy during the measurement.

[0002]

2. Description of the Related Art One of the cases where it is necessary to measure the calorific value is a vitrified material in which a high-level waste liquid generated by the reprocessing of spent fuel in a nuclear power plant is placed in a sealed container (canister). In order to store safely in a radioactive waste storage facility for a long period of time, it is necessary to measure in advance the heat generated by the vitrified material itself, and also to perform other inspections and measurements prescribed by regulations.

[0003] A plurality of vitrified wastes processed in a spent fuel reprocessing plant or the like are put in a transport container and transported to a storage facility.

In this storage facility, as shown in FIG. 3, the transport container C is lowered to the temporary storage area D by the overhead crane B of the vitrified waste receiving building A, and is transferred to the vitrified material extraction chamber F by the transport container transport vehicle E. Transfer. Here, after the gas in the transport container C is sampled and the concentration of the radioactive substance is measured, the auxiliary crane G is remotely searched to remove the lid of the transport container C, and on the temporary storage stand I of the vitrified temporary storage site H. Temporarily put the vitrified body J in the room.

[0005] Then, the vitrified materials J are sequentially taken out from the vitrified material temporary storage place H, and seven items of inspection and measurement necessary for safe storage of each vitrified material J are performed.

The vitrified product which has been inspected / measured in this way is carried to the transfer room L by the floor traveling crane K, and is piled up and stored in the storage pipe N of the storage pit M.

As shown in FIG. 4, for example, the calorific value of the vitrified body J is measured by placing the vitrified body placed in the canister 2 on the turntable 1 and driving the heat flux meter 3 to the driving device 4. The heat flux is measured while moving close to the side surface of the canister 2 and moving up and down along the side surface, and the total calorific value is obtained by calculation from the surface area of the canister 2 obtained in advance.

[0008]

However, when using such a heat flux meter 3 and calculating the total calorific value from the result, the measured value of the heat flux meter 3 is used for the canister 2 which is the surface to be measured. There is a problem that the side surface is easily affected by the heat radiation, and the influence of the heat radiation must be corrected.

In addition, the heat flux meter 3 cannot measure the energy dissipated in the form of gamma rays, and there is also a problem that the heat must be corrected.

Therefore, a calorimeter method can be considered as a method of correcting the influence of thermal radiation and measuring without being affected by gamma rays. For example, as shown in FIG. The drawn canister 2 is put in, the air is sucked by the fan 6, the flow rate of the air is measured by the flow meter 7, and the inlet temperature and the outlet temperature of the air are measured by the temperature detectors 8 and 9, so that the calorific value is reduced. Although it is required, accurate measurements cannot be made unless it is in a steady state thermally, and it takes a long time to perform measurements.
There is a problem that the time required to complete the measurement is also long.

[0011] The present invention has been made in view of the above-mentioned problems of the prior art, and measures the amount of heat generated while being temporarily placed for other inspections and measurements, thereby enabling other inspections and measurements to be performed. The total inspection and measurement time can be shortened,
Moreover, it is an object of the present invention to provide a calorific value measuring device which has a small number of measurement items and can measure easily and with high accuracy.

[0012]

According to a first aspect of the present invention, there is provided a calorific value measuring apparatus in which a plurality of objects to be measured are placed in a temporary storage place where a plurality of objects to be measured are temporarily stored. And a partition wall for partitioning the periphery of the object to be measured on each of the support frames, and a flow adjusting means for equalizing the amount of air flowing in the space surrounded by each partition wall with the support frame. A temperature measuring means provided between the partition wall and the inlet and outlet temperatures of air into the space partitioned by the partition walls, and a measurement result from the temperature measuring means and the previously known temporary storage area And a calculating means for calculating the calorific value of each object to be measured from the total amount of air supplied to the measuring object.

According to this calorific value measuring device, a support base for mounting the object to be measured is provided in the temporary storage place, and the space where each object to be measured is placed is partitioned by a partition wall provided around the support base, and the air flowing through this space is separated. A flow control means such as an orifice is provided so that the flow rate is constant, and the flow rate flowing through the space of each measured object is known from the amount of air flowing through the whole, and the air inlet temperature and outlet temperature of the space where each measured object is placed Is measured by the temperature measuring means, and the calorific value can be easily obtained by the calculating means only by measuring the temperature and utilizing the temporarily placed time.

[0014] Thus, high-precision measurement can be performed without being affected by heat radiation, and it is not necessary to take extra time to measure the amount of heat generation, so that the measurement time can be shortened.

According to a second aspect of the present invention, there is provided a calorific value measuring apparatus according to the first aspect, wherein the object to be measured is a sealed container containing a vitrified body. It is.

According to this calorific value measuring apparatus, the object to be measured is a vitrified sealed container, and the calorific value of the vitrified sealed container can be determined easily and accurately while temporarily placed in a temporary storage place. And the overall inspection and measurement time including other inspection and measurement can be shortened.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2
FIG. 1 shows an embodiment in which the calorific value measuring apparatus of the present invention is applied to the measurement of the calorific value of a vitrified sealed container.
Is a partially enlarged sectional view, and FIG. 2 is an overall plan view and an AA sectional view.

In this calorific value measuring device 10, the entire temporary storage space of the canister 2 containing the vitrified material is used as a calorific value measuring device. As shown in FIG. An H-shaped steel support member 12 is arranged in a shape, and is divided into sections 13 each having a square cross section, and each section 13 has such a size that the canister 2 can be stored one by one.

In each section 13, a cylindrical partition wall 14 is arranged and attached to the support member 12 so as to partition the outer periphery of the canister 2.
The cooling air 15 flows through a gap between the inner periphery of the partition wall 14 and the outer periphery of the canister 2. The partition wall 14 has a heat insulating structure such as filling a heat insulating material so as not to be affected by heat between the partition wall 14 and the canister 2 stored in the adjacent section.

A support base 16 having a circular cross section on which the canister 2 is placed is provided below the partition wall 14 of the heat insulating structure at a predetermined height from the bottom of the temporary storage pit 11. The predetermined height of the support base 16 from the temporary storage pit 11 allows the air 15 flowing in the gap between the partition wall 14 and the canister 2 to flow without interference between the adjacent sections 13. It is for.

Also, as shown in FIG. 1, an orifice 17 is attached to the support base 16 as a flow control means so that the air 15 can flow uniformly by the same amount regardless of the position of each section 13. Inner circumference of wall 14 and support base 1
6 is adjusted by narrowing the gap with the outer periphery.

The outer diameter of the orifice 17 in each section 13 does not need to be constant. If the flow rate of the air 15 differs depending on the position of the section 13, the diameter of the orifice 17 is changed to make the orifice 17 uniform in each section 13. To be. Although the orifice is used as the flow rate adjusting means, the flow rate may be adjusted by giving an orifice effect at the outer peripheral portion of the support base itself, or a flow rate adjusting means such as another valve may be provided.

Since the orifice 17 as such a flow rate adjusting means is provided in each section 13, the same amount of air 15 flows in each section 13 so that the amount of air supplied to the temporary storage pit 11 can be known. It is not necessary to measure the flow rate of the air 15 in each section 13.

Air 15 is placed above partition wall 14 of each section 13.
18 as a temperature measuring means for measuring the inlet temperature of the
Is provided, and a thermometer 19 as a temperature measuring means for measuring the outlet temperature of the air 15 is provided below the partition wall 14.

Then, the measurement results of the thermometers 18 and 19 are inputted to a computer 20 which is a computing means installed in a control room (not shown). The amount of air flowing through each section 13 is input to the computer 20 in advance.

In the calorific value measuring apparatus 10 configured as described above, the canister 2 containing the vitrified material is placed on the support base 16 of each section 13 of the temporary storage pit 11 for the vitrified material, and cooled. The air 15 for use.

In this state, the canister 2 is temporarily placed, and after a certain period of time, the canister 2 is in a thermal steady state.

Therefore, the inlet and outlet temperatures of the air 15 flowing inside the partition wall 14 of each section 13 are measured by thermometers 18 and 1.
It measures at 9 and inputs it to the computer 20.

Then, since the flow rate of the air 15 flowing inside each partition wall 14 is known and the temperature difference is obtained, the calorific value of each canister 2 can be obtained by calculation.

Therefore, only by measuring the inlet temperature and the outlet temperature of the air 15 with the thermometers 18 and 19, the calorific value can be obtained by calculation thereafter, and the measuring system can be simplified.

Since the calorific value is obtained from the temperature difference of the air 15 flowing around the canister 2, the measurement can be performed with high accuracy without being affected by heat radiation, and the calorific value can be measured using the temporary storage time. It is possible to shorten the total inspection / measurement time required for the inspection / measurement of seven items necessary for the vitrified body.

In the above embodiment, the measured object is a canister of a vitrified body. However, the invention is not limited to this, and another object that needs to measure the calorific value may be used.

[0033]

As described above in detail with one embodiment, according to the calorific value measuring apparatus according to the first aspect of the present invention, a support base for mounting a measurement object on a temporary storage place is provided and its surroundings are provided. The space in which each DUT is placed is partitioned by a partition wall provided in the unit, and flow rate adjusting means such as an orifice is provided so that the flow rate of the air flowing through this space is constant. Since the flow rate flowing through the space is known and the air inlet temperature and outlet temperature of the space where each object is placed are measured by the temperature measuring means, only the temperature measurement is used, The calorific value can be easily obtained by the calculation means.

[0034] Thus, high-precision measurement can be performed without being affected by heat radiation, and it is not necessary to take extra time for measuring the amount of generated heat, thereby shortening the measurement time.

According to the calorific value measuring apparatus according to the second aspect of the present invention, since the object to be measured is a vitrified sealed container, the glass can be easily and highly accurately placed in a temporary storage place. The calorific value of the solidified sealed container can be obtained,
The entire inspection and measurement time including other inspection and measurement can be shortened.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of an embodiment in which a calorific value measuring device of the present invention is applied to measurement of a calorific value of a vitrified sealed container.

FIG. 2 is an overall plan view and an AA cross-sectional view of an embodiment in which the calorific value measuring apparatus of the present invention is applied to the measurement of the calorific value of a vitrified sealed container.

FIG. 3 is a schematic configuration diagram of a storage facility for a vitrified body.

FIG. 4 is a schematic configuration diagram of a conventional measuring device for obtaining a calorific value of a vitrified body from a heat flux.

FIG. 5 is a schematic configuration diagram of a conventional measuring device for obtaining a calorific value of a vitrified body from a temperature change of air.

[Explanation of symbols]

 2 Canister (vitrified body) 10 Calorific value measuring device 11 Temporary storage pit 12 Support member 13 Section 14 Partition wall 15 Air 16 Support gantry 17 Orifice (flow control means) 18 Thermometer (air inlet) 19 Thermometer (air outlet) 20 Computers (arithmetic means)

Claims (2)

[Claims] A support base on which each of the measured objects is placed is provided in a temporary storage area where a plurality of measured objects are temporarily placed, and a partition wall that partitions the periphery of the measured object on each of the support frames is provided. And a flow rate adjusting means for equalizing the amount of air flowing in the space surrounded by each partition wall is provided between the support base and the partition wall, and the inlet temperature of the air into the space partitioned by these partition walls is provided. And temperature measuring means for measuring the outlet temperature, and calculating means for calculating the calorific value of each object to be measured from the measurement result from the temperature measuring means and the total amount of air to the temporary storage area known in advance. A calorific value measuring device, characterized in that: 2. The calorific value measuring apparatus according to claim 1, wherein the object to be measured is a sealed container containing a vitrified body.