CN115775644A - Method for on-line irradiation of heavy water reactor to test material - Google Patents

Abstract

The invention discloses a method for testing materials by heavy water reactor online irradiation, which comprises the following steps: the concave base and the guide rod are arranged; installing an irradiation material and a steel wire rope into a wheel groove of an irradiation device; mounting an irradiation device onto a designated VFD; carrying out sample irradiation; dismantling the irradiation device; shearing the steel wire rope and taking out an irradiation sample; cutting the residual steel wires and storing as waste; restoring the device state on the designated VFD; and (4) carrying out decontamination treatment on the irradiation and shearing device. The invention has the beneficial effects that: the irradiation tunnel can be opened during high power operation of the unit, the sample can be placed in the core, and the sample can be taken out after a short period of irradiation (usually weeks or months) and sent to an analytical test.

Description

Method for testing material by heavy water reactor online irradiation

Technical Field

The invention belongs to the field of nuclear technology application, and particularly relates to a method for testing a material by heavy water reactor online irradiation.

Background

The heavy water reactor adopts a pressure tube type reactor core design. The calandria container is horizontally arranged, the pressure pipe is used as a pressure bearing part of a loop and is arranged in the calandria container according to a square grid. The coolant and moderator are separately disposed and the coolant flows into the pressure tube from one end and out the other end to carry away heat generated by fuel fission and nuclide decay. The coolant and the moderator are heavy water, and the fuel is natural uranium generally. The fuel structure is short and multiple fuel bundles are typically loaded in series in one pressure tube channel. Heavy water reactors require refueling during power operation due to the low residual reactivity, with an upstream refueling machine pushing fuel assemblies into the core and a downstream refueling machine receiving discharged spent fuel assemblies. Sufficient spacing between the pressure tubes is maintained for reasons of facilitating the refueling operation. The spacing provides space for the reactor control and protection devices to operate. The heavy water reactor is designed with various control and protection devices, such as a regulating rod, a liquid area control device, a mechanical control absorption rod, a reactor shutdown rod and the like. The heavy water reactor control and protection devices are all arranged in the moderator area outside the pressure pipe and are kept in a vertical state with the pressure pipe. The active area of the heavy water reactor core is approximately Φ 6m × 6m. In order to accurately measure and control the local power distribution of the reactor core on the heavy water reactor, a large number of neutron detector assemblies are arranged in the active area of the reactor core, and the neutron detector assemblies provide real-time signals for a heavy water reactor reactivity control and protection device. There are 11 channels in the same neutron detector assembly for placement of detectors. In fact, not all of the channels of each detector assembly on the heavy water reactor are occupied by detectors. Meanwhile, a movable fission ionization chamber channel is reserved in the central part of each detector assembly on the heavy water reactor so as to be convenient for core flux measurement during debugging and operation. The lower part of the pore channel is sealed, the upper part is directly communicated to the upper end cover of the connecting chamber of the component, and the upper part is plugged by a bolt under normal conditions. Examples of irradiation tests of materials on heavy water piles are available, but non-mobile fission ionization chamber channels are adopted. Both the material stacking and the material stacking need to be carried out during overhaul, and after the upper end cover of the assembly is removed, special tools are installed for operation. In consideration of the fact that part of the material testing time is short in the practical situation, the operation of stacking in and stacking out is not allowed to be carried out during two adjacent overhaul periods, namely the situation that the material is tested by online irradiation needs to be considered. The movable fission ionization chamber pore channel provides a convenient space for testing small-diameter materials by online irradiation.

In the prior art, the irradiation pore channel needs to be opened during the period of major repair shutdown of the unit, the sample is put into the reactor core, and the reactor core is taken out during the period of major repair shutdown of the unit, so that the irradiation time is only suitable for irradiation examination and irradiation of the sample longer than two years.

Disclosure of Invention

The invention aims to provide a method for irradiating a test material on line by a heavy water reactor, which provides necessary irradiation test conditions for the preproduction of certain isotope material quantities.

The technical scheme of the invention is as follows: a method for on-line irradiation of a heavy water reactor test material comprises the following steps:

step 1: the concave base and the guide rod are arranged;

and 2, step: installing an irradiation material and a steel wire rope into a wheel groove of an irradiation device;

and step 3: mounting an irradiation device onto a designated VFD;

and 4, step 4: carrying out sample irradiation;

and 5: dismantling the irradiation device;

and 6: shearing the steel wire rope and taking out an irradiation sample;

and 7: cutting the residual steel wires and storing as waste;

and step 8: restoring the device state on the designated VFD;

and step 9: and (4) carrying out decontamination treatment on the irradiation and shearing device.

The step 1 comprises the following steps:

step 11 removes the additional mask blocks on the designated VFD in advance,

step 12 two guide rods are mounted on the concave base,

step 13, removing the bolts on the upper cover plate of the designated VFD connecting chamber.

The step 2 comprises the following steps:

step 21 the sheave chamber cover plate of the irradiation device is disassembled,

step 22 opens the screen door at the lower part of the irradiation unit,

step 23, the steel wire rope passes through the lower flange of the irradiation device,

step 24, the upper end of the steel wire rope is clamped into the bayonet of the wheel groove,

step 25, the grooved pulley is rotated anticlockwise, the steel wire rope is wound in the grooved pulley,

step 26 installs the sheave chamber cover plate of the irradiation device.

The step 3 comprises the following steps:

step 31, using a 1.5T chain block to hoist the irradiation device above the specified VFD,

step 32, slowly descending the irradiation device, enabling the two guide rods to penetrate through the guide holes of the lower flange of the irradiation device,

step 33, the irradiation device is slowly lowered continuously to make the lower flange of the irradiation device contact with the concave base,

step 34, the lifting appliance is released, the chain block is transferred to the initial position,

step 35 is that the driving device is connected with a driving power supply, and the signal wire is connected with a control computer.

The step 4 comprises the following steps:

step 41 uses a control computer to rotate a sheave counterclockwise to insert the irradiation sample into a designated position in the core,

step 42, keeping the irradiation sample receiving neutron irradiation in the reactor, collecting the real-time reactor core flux, evaluating the irradiation effect, and after the irradiation purpose is achieved,

step 43, the control computer is used for clockwise rotating the grooved wheel, the irradiation sample is transferred into the irradiation device,

and step 44, closing a shielding door at the lower part of the irradiation device, and removing the connection between a driving power supply and a signal on the irradiation device to prepare for transferring.

The step 5 comprises the following steps:

step 51, using a chain block to slowly lift the irradiation device off the concave base,

step 52, after the lower flange of the irradiation device is separated from the guide rod, the irradiation device is lifted away from the reactor control structure platform,

step 53, butting the irradiation device to a receiving seat of the shearing equipment, connecting a lower flange of the irradiation device with an upper flange of the receiving seat by adopting bolts,

and step 54, connecting a driving power supply to the driving device, connecting the signal wire with a control computer, and preparing for cutting the steel wire rope.

The step 6 comprises the following steps:

step 61 opens the screen door at the lower part of the irradiation unit,

step 62 uses the control computer to rotate the sheave counterclockwise, insert the irradiated sample into the shielded transport container,

step 63, cutting the steel wire rope to enable the irradiation sample section to automatically drop into the shielding container,

step 64, the control computer is used to rotate the grooved pulley clockwise to lift the steel wire rope by a section,

step 65 closes the upper opening of the shielded container and closes the shield door at the lower part of the irradiation device,

step 66, opening a shield door of the shearing equipment, taking out the shield container,

step 67 transfers the shielded container loaded with the irradiated sample to a designated analysis station.

The step 7 comprises the following steps:

step 71 is to install a new shielded container,

step 72, opening the upper opening of the shielding container, closing the shielding door of the shearing equipment,

step 73 is to open the screen door at the lower part of the irradiation device,

step 74 uses the control computer to rotate the sheave counterclockwise, insert the irradiated sample into the shielded transport container,

step 75, cutting the steel wire rope to enable the cut section to fall into the shielding container,

step 76, repeating 74-75 until the cutting is completed,

step 77 closes the upper opening of the shielded container and closes the shield door at the lower part of the irradiation device,

step 78, the shield door of the shearing apparatus is opened, the shield container is removed,

step 79 transports the shielded container to a spent fuel receiving pool for storage,

step 710 releases the drive power and signal connections on the irradiation device.

The step 8 comprises:

step 81 installs the bolts on the upper cover plate of the assigned VFD junction box,

step 82 removes the guide bar.

The step 9 comprises:

step 91, disassembling the irradiation device for decontamination treatment, wrapping the last section of disassembled steel wire rope with plastic paper,

step 92 of disassembling the shearing device for decontamination treatment,

step 93 transfers the irradiation unit and the shearing unit to a designated storage.

The invention has the beneficial effects that: the irradiation tunnel can be opened during high power operation of the unit, the sample can be placed in the core, and the sample can be taken out after a short period of irradiation (usually weeks or months) and sent to an analytical test.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

A method for irradiating a test material on line by a heavy water reactor comprises the following steps:

step 1: the concave base and the guide rod are installed.

The method comprises the following steps: step 11 is performed to remove the additional shielding block on the designated VFD in advance, and install the concave base,

and step 12 is executed to install two guide rods on the concave base (the guide rods are connected with the concave base by bolts),

step 13 is executed to remove the bolts on the upper cover plate of the designated VFD chamber.

Step 2: and installing the irradiation material and the steel wire rope into a wheel groove of the irradiation device.

The method comprises the following steps: step 21 is performed to disassemble the sheave chamber cover plate of the irradiation device,

and step 22 is executed to open the screen door at the lower part of the irradiation device,

then step 23 is executed to thread the steel cable through the lower flange of the irradiation device,

and step 24 is executed to clamp the upper end of the steel wire rope into the bayonet of the wheel groove,

and then step 25 is executed to rotate the sheave counterclockwise, wind the steel wire rope into the sheave groove,

finally step 26 is performed to install the sheave chamber cover plate of the irradiation device.

And step 3: the irradiation unit is mounted to a designated VFD.

The method comprises the following steps: step 31 is executed to hoist the irradiation device above the assigned VFD with a 1.5T chain block,

then step 32 is performed to slowly lower the irradiation device, and the two guide rods are passed through the guide holes of the lower flange of the irradiation device,

then, step 33 is executed to continue to slowly descend the irradiation device, so that the lower flange of the irradiation device is contacted with the concave base,

then step 34 is executed to release the lifting appliance, and the chain block is transferred to the initial position,

and finally, executing a step 35 of connecting the driving device with a driving power supply and connecting the signal wire with a control computer.

And 4, step 4: and carrying out sample irradiation.

The method comprises the following steps: step 41 is executed to use the control computer to rotate the sheave counterclockwise, insert the irradiation sample into a designated position in the core,

then step 42 is executed to keep the irradiation sample receiving neutron irradiation in the reactor, collect the real-time reactor core flux, evaluate the irradiation effect, and after the irradiation purpose is achieved,

then step 43 is executed to rotate the grooved wheel clockwise by using the control computer, the irradiation sample is transferred into the irradiation device,

finally, step 44 is executed to close the screen door at the lower part of the irradiation device, and the driving power supply and the signal connection on the irradiation device are released to prepare for transferring.

And 5: and (5) dismantling the irradiation device.

The method comprises the following steps: step 51 is executed to slowly hoist the irradiation device off the concave base using a chain block,

and then step 52 is executed, after the lower flange of the irradiation device is separated from the guide rod, the irradiation device is lifted away from the reactor control structure platform,

then step 53 is executed to butt-joint the irradiation device to the receiving seat of the shearing equipment, the lower flange of the irradiation device is connected with the upper flange of the receiving seat by adopting bolts,

and finally, executing a step 54 of connecting the driving device with a driving power supply, connecting the signal wire with a control computer and preparing for cutting the steel wire rope.

And 6: and shearing the steel wire rope and taking out the irradiation sample.

The method comprises the following steps: step 61 is executed to open the screen door at the lower part of the irradiation device,

then step 62 is performed to insert the irradiated sample into the shielded transport container using the control computer to rotate the sheave counterclockwise,

then step 63 is executed to cut off the steel wire rope, so that the irradiation sample section automatically falls into the shielding container,

then, step 64 is executed to rotate the sheave clockwise by using the control computer to lift the steel wire rope by a section,

step 65 is executed to close the upper opening of the shielding container and close the shielding door at the lower part of the irradiation device,

step 66 is then performed to open the shield door of the shearing apparatus, remove the shield container,

finally, step 67 is performed to transfer the shielded container loaded with the irradiated sample to the designated analysis station.

And 7: the remaining wire is cut and stored as scrap.

The method comprises the following steps: a step 71 is performed to install a new shielding container,

and step 72 is performed to open the upper opening of the shield container, and close the shield door of the cutting device,

a step 73 is executed to open the screen door at the lower part of the irradiation device,

then step 74 is performed using the control computer to rotate the sheave counterclockwise, insert the irradiated sample into the shielded transport container,

then, step 75 is executed to cut the steel wire rope, so that the cut section falls into the shielding container,

step 76 is performed again, i.e., 74-75 are repeated until the cut is completed,

step 77 is executed to close the upper opening of the shielding container and close the shielding door at the lower part of the irradiation device,

step 78 is then performed to open the shield door of the shearing device, remove the shielded container,

then step 79 is executed to transfer the shielding container to a spent fuel receiving pool for storage,

finally, step 710 is performed to disconnect the drive power and signal connections on the irradiation unit.

And 8: the device state on the designated VFD is restored.

The method comprises the following steps: step 81 is performed to install the bolts on the upper cover plate of the designated VFD docking chamber,

and a step 82 of removing the guide bar is performed.

And step 9: and (4) carrying out decontamination treatment on the irradiation and shearing device.

The method comprises the following steps: step 91 is executed to disassemble the irradiation device for decontamination treatment, the last section of disassembled steel wire rope is wrapped by plastic paper,

then step 92 is performed to disassemble the shearing device for decontamination,

finally, step 93 is executed to transfer the irradiation device and the shearing device to a designated storage room for storage.

Claims (10)

1. A method for irradiating a test material on line by a heavy water reactor is characterized by comprising the following steps:

step 1: the concave base and the guide rod are arranged;

and 2, step: installing the irradiation material and the steel wire rope into a wheel groove of an irradiation device;

and step 3: mounting an irradiation device onto a designated VFD;

and 4, step 4: carrying out sample irradiation;

and 5: dismantling the irradiation device;

step 6: shearing the steel wire rope and taking out an irradiation sample;

and 7: cutting the residual steel wires and storing as waste;

and step 8: restoring the device state on the designated VFD;

and step 9: and (4) carrying out decontamination treatment on the irradiation and shearing device.

2. The method for the on-line irradiation of the test material by the heavy water reactor as claimed in claim 1, wherein the step 1 comprises:

step 11 removes the additional mask blocks on the designated VFD in advance,

step 12 two guide rods are mounted on the concave base,

and 13, removing the bolt on the upper cover plate of the designated VFD connecting chamber.

3. The method for the on-line irradiation of the test material by the heavy water reactor as claimed in claim 1, wherein the step 2 comprises:

step 21 the sheave chamber cover plate of the irradiation device is disassembled,

step 22 opens the screen door at the lower part of the irradiation device,

step 23, the steel wire rope passes through the lower flange of the irradiation device,

step 24, the upper end of the steel wire rope is clamped into the bayonet of the wheel groove,

step 25, the grooved pulley is rotated anticlockwise, the steel wire rope is wound in the grooved pulley,

step 26 installs the sheave chamber cover plate of the irradiation device.

4. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 3 comprises:

step 31, hanging the irradiation device on a designated VFD by using a 1.5T chain block,

step 32, slowly descending the irradiation device, enabling the two guide rods to penetrate through the guide holes of the lower flange of the irradiation device,

step 33, the irradiation device is slowly lowered continuously to make the lower flange of the irradiation device contact with the concave base,

step 34, the lifting appliance is released, the chain block is transferred to the initial position,

step 35 is that the driving device is connected with a driving power supply, and the signal wire is connected with a control computer.

5. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 4 comprises:

step 41, using a control computer to rotate the grooved wheel anticlockwise, inserting the irradiation sample into a designated position in the reactor core,

step 42, keeping the irradiation sample to receive neutron irradiation in the reactor, collecting the real-time reactor core flux, evaluating the irradiation effect, and after the irradiation purpose is achieved,

step 43, the control computer is used for clockwise rotating the grooved wheel, the irradiation sample is transferred into the irradiation device,

and step 44, closing the shielding door at the lower part of the irradiation device, and releasing the connection between the driving power supply and the signal on the irradiation device to prepare for transferring.

6. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 5 comprises:

step 51, using a chain block to slowly lift the irradiation device off the concave base,

step 52, after the lower flange of the irradiation device is separated from the guide rod, the irradiation device is lifted away from the reactor control structure platform,

step 53, butting the irradiation device to a receiving seat of the shearing equipment, connecting a lower flange of the irradiation device with an upper flange of the receiving seat by adopting bolts,

and step 54, connecting the driving device with a driving power supply, connecting the signal wire with a control computer, and preparing for cutting the steel wire rope.

7. The method for the on-line irradiation of the test material by the heavy water reactor as set forth in claim 1, wherein the step 6 comprises:

step 61 opens the screen door at the lower part of the irradiation unit,

step 62 uses the control computer to rotate the sheave counterclockwise, insert the irradiated sample into the shielded transport container,

step 63, cutting off the steel wire rope to enable the irradiation sample section to automatically fall into the shielding container,

step 64, the control computer is used to rotate the grooved pulley clockwise to lift the steel wire rope by a section,

step 65 closes the upper opening of the shielded container and closes the shield door at the lower part of the irradiation unit,

step 66, opening the shield door of the shearing equipment, taking out the shield container,

step 67 transfers the shielded container loaded with the irradiated sample to a designated analysis station.

8. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 7 comprises:

step 71 is to install a new shielded container,

step 72, opening the upper opening of the shielding container, closing the shielding door of the shearing equipment,

step 73 is to open the screen door at the lower part of the irradiation device,

step 74 using the control computer to rotate the sheave counterclockwise, insert the irradiated sample into the shielded transport container,

step 75, cutting the steel wire rope to enable the cut section to fall into the shielding container,

step 76, repeating 74-75 until shearing is completed,

step 77 closes the upper opening of the shielded container and closes the shield door at the lower part of the irradiation device,

step 78 opens the shield door of the shearing apparatus, removes the shield container,

step 79 transfers the shielded container to a spent fuel receiving pool for storage,

step 710 releases the drive power and signal connections on the irradiation device.

9. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 8 comprises:

step 81 mounts the bolts on the upper cover plate of the assigned VFD docking chamber,

step 82 removes the guide bar.

10. The method for irradiating the test material on the heavy water reactor on line according to claim 1, wherein the step 9 comprises:

step 91, disassembling the irradiation device for decontamination treatment, wrapping the last section of disassembled steel wire rope with plastic paper,

step 92 of disassembling the shearing device for decontamination treatment,

step 93 transfers the irradiation unit and the shearing unit to a designated warehouse for storage.