CN108899105B - Production method for heavy water reactor spent fuel dry storage - Google Patents

Abstract

The invention belongs to the technical field of nuclear power station spent fuel transmission, and particularly relates to a production method for heavy water reactor spent fuel dry storage, aiming at developing a production method for heavy water reactor spent fuel dry storage, so as to ensure safe and orderly production of the spent fuel dry storage and provide an advanced production method for other commercial reactor spent fuel storage. The heavy water reactor spent fuel dry-type storage production method described in the invention is convenient to use, popular and easy to understand, has strong practicability, ensures the heavy water reactor spent fuel dry-type storage production to be safe and reliable, has high economic benefit, ensures the stable operation of a power station, optimizes and solidifies the production process through production experience summary for many years, greatly improves the efficiency, completely meets the existing storage requirements of spent storage, can popularize the advanced production method of spent fuel storage to similar power stations at home and abroad when low-level human events occur at last.

Description

Production method for heavy water reactor spent fuel dry storage

Technical Field

The invention belongs to the technical field of spent fuel transmission of nuclear power stations, and particularly relates to a heavy water reactor cobalt isotope production method.

Background

The two heavy water reactor nuclear power units of the Qinshan nuclear power are only two heavy water reactor units in China at present, the advantage of the heavy water reactor is that materials are changed without stopping the reactor, but as the storage capacity of a material changing pool is limited, spent fuel must be built for temporary dry storage so as to meet the requirement of stable operation of the heavy water reactor nuclear power station. The main process is that the spent fuel in a spent fuel water pool is filled into a fuel basket for more than 6 years, the spent fuel enters a shielding workstation for drying and welding, then the spent fuel is guided into a transport container to be transferred to a storage area for storage, Qinshan nuclear power tries to explore and optimize a dry-type spent fuel storage production method, and through the accumulation of years of operation and production experience, a dry-type storage production method of the heavy water reactor spent fuel is worked out, so that the safe and orderly production of the dry-type spent fuel is ensured, and a method is provided for storing other commercial reactor spent fuels.

Disclosure of Invention

The invention aims to develop a dry storage production method of heavy water reactor spent fuel, thereby ensuring the safe and orderly production of the dry storage of the spent fuel and providing an advanced production method for the storage of other commercial reactor spent fuel.

The invention is realized by the following steps:

1. a production method for dry storage of heavy water reactor spent fuel specifically comprises the following steps:

the method comprises the following steps: the fuel basket is transferred to check launching;

step 1.1: transfer of new-fuel baskets from the extension plant to the spent fuel plant: transferring the new fuel basket from the extension workshop to the spent fuel workshop by using a 2T hydraulic forklift;

step 1.2: removing the package, opening the basket cover, checking and measuring, and verifying the number: removing all packages of the fuel basket, visually checking whether the surface of the fuel basket has defects, measuring the gap of a central hole by using a feeler gauge to be less than 2mm, and checking whether the numbering of the basket cover and the numbering of the base are consistent or not;

step 1.3: the fuel basket is positioned on the edge of the pool and drips: transferring the fuel basket to a water dripping tray at the side of a spent fuel pool by using a 2T annular crane and a short-handle fuel basket lifting tool, and unlocking and separating the short-handle fuel basket lifting tool and the fuel basket;

step 1.4: transferring the fuel basket to the underwater turret: connecting and locking a long-handle fuel basket operating tool with a fuel basket in a drip tray, connecting the upper part of the long-handle tool with a ring-shaped lifting hook, lifting the long-handle tool, moving a crane to descend above a water pool by 1.5 meters, so that an air-fuel basket is filled with water and no bubbles overflow, continuously descending the fuel basket to a position of an underwater rotary table, and unlocking the long-handle fuel basket operating tool;

step two: a spent fuel loading basket;

step 2.1: opening the fuel basket cover underwater and storing the fuel basket cover at an idle position of an underwater platform: connecting the upper part of an underwater operation tool of the pneumatic fuel basket with a 2T man-bridge crane of a factory building, connecting an input electric pipeline plug, moving the underwater operation tool to the upper part of the fuel basket of the rotary table, contacting with a basket cover, closing a locking switch of the fuel basket cover, confirming that four hooks of the tool completely clamp the edge of the basket cover, and lifting the basket cover to be in place at an idle position of an underwater platform;

step 2.2: the full-load fuel tray is positioned in the tipping machine, and the tipping machine is tipped to be in a vertical state: connecting the fuel tray transfer tool with a 2T passenger bridge crane, moving the fuel tray transfer tool to the position above a tray to be loaded according to a loading plan, connecting the fuel tray transfer tool with the 2T passenger bridge crane, lifting the safety height, transferring the fuel tray transfer tool to a tipping machine, confirming that four positioning holes of the tray completely enter positioning pins of the tipping machine, and removing the tray transfer tool; putting down the cover plate of the tipper, and turning 22 circles of the driving device handle of the hand-operated tipper to confirm that the tipper is at 90 degrees;

step 2.3: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting an input plug of a pressure-relief pipeline, confirming normal pressure, moving a crane, confirming that a gripping head of the bundle gripping tool is aligned with the upper part of the fuel bundle, descending the crane, confirming that the gripping head completely enters the upper part of the fuel bundle, and pressing a bundle gripping tool locking switch; lifting the balance crane by 0.75 meter, moving the balance crane above the fuel basket specified position hole channel on the rotary table of the balance crane, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 2.4: after the 12 bundles are loaded, the pallet is turned and brought into position on the tipper: after all the 12 pieces in the above step are completely grabbed and loaded, the fuel tray needs to be reversed, the tipping machine is driven by hand to be in a horizontal state, the tray transfer tool is connected with the 2T bridge crane, the crane is moved to the tray and is connected with the tray, the tray transfer tool is rotated by 180 degrees after being lifted to a safe height, the fuel tray is descended until the four positioning holes of the tipping machine completely enter, and the tray is separated from the tray transfer tool;

step three: the fuel basket transfers water;

step 3.1: putting down a cover plate of the tipper and tipping the tipper to be in a 90-degree vertical state: putting down the cover plate of the tipper, and turning 22 circles of the driving device handle of the hand-operated tipper to confirm that the tipper is at 90 degrees;

step 3.2: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting an input plug of a pressure-relief pipeline, confirming normal pressure, moving a crane, confirming that a gripping head of the bundle gripping tool is aligned with the upper part of the fuel bundle, descending the crane, confirming that the gripping head completely enters the upper part of the fuel bundle, and pressing a bundle gripping tool locking switch; lifting the balance crane to 0.75 m, moving the balance crane above the specified position hole channel of the fuel basket on the rotary table of the balance crane, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 3.3: after the 12 bundles are loaded, the empty tray is removed to the specified position: the hand-operated tipper drives a handle to enable the tipper to be in a horizontal state, the tray transfer tool is connected with the 2T bridge crane, the crane is moved to the tray and connected with the tray, and after the tray transfer tool is lifted to a safe height, the crane is moved to move the empty tray to a specified position for storage;

step 3.4: and repeating the second step and the third step until the loading of the 60 rod bundles is completed: lifting the planned loaded trays by using a tray transfer tool, operating the tipping machine to finish loading 60 straight trays, and transferring the corresponding empty trays to a specified position for storage;

step four: drying and welding the fuel basket;

step 4.1: resume fuel basket lid, just be located transmission dolly D side under water: after loading of 60 bundles, checking and confirming the integrity of the loaded bundles by using an underwater high-definition television, moving a pneumatic fuel basket operation tool to the position above the turntable fuel basket, contacting with a basket cover, closing a fuel basket cover locking switch, confirming that four hooks of the tool completely clamp the edge of the basket cover, lifting the basket cover to the position above the turntable fuel basket, confirming that a positioning indicating lamp is on, and releasing the fuel basket cover locking switch; locking a central column of a gripping head of the fuel basket, lifting the fuel basket to a safe height, and positioning the fuel basket on the side of the underwater transport trolley D;

step 4.2: shielding transport container just lies in the stoving welding case, and dolly to B side under water lifts by crane the fuel basket: moving the shielding transport container to a drying welding box by using a factory crane, opening a shielding door of the shielding transport container, driving a rocking handle of the underwater transport trolley to enable a fuel basket of the underwater transport trolley to reach the side B, descending a gripper head of a chain crane of the drying welding box to enable the gripper head of the underwater transport trolley to completely enter a fuel basket central column, locking the gripper head and hoisting the fuel basket;

step 4.3: fuel basket washing, draining, drying and welding: after the fuel basket is lifted, starting a cleaning device, cleaning the surface of the fuel basket and a chain of a chain crane, moving the chain crane up and down three times in a specified cleaning area, closing the cleaning device, lifting the fuel basket to the highest position, lighting an upper indicator lamp, moving a drying welding box pulley rotating table to the lower part of the fuel basket, descending the fuel basket in place, drying the welding box pulley rotating table, removing a gripping head of the chain crane, lifting the fuel basket to the highest position, ascending a lifting arm of the fuel basket, enabling the water inside the fuel basket to have no line shape, and descending the lifting arm of the fuel basket; moving a trolley of a drying welding box to a drying position, lifting a fuel basket lifting arm again, starting a rotary table, confirming the serial number again, starting an exhaust fan, an air inlet machine and two electric heaters, turning off one electric heater after the temperature reaches 90 ℃, completing the drying after about 45 minutes, turning off the electric heater, descending the fuel basket lifting arm, moving the trolley of the drying welding box to the welding position, starting a welding system, welding a lower welding seam, welding an upper welding seam, adjusting the positions of a welding gun and a tracker, completing the welding of the lower welding seam, adjusting the welding gun and the tracker, and closing the welding system after the welding is completed;

step 4.4: inspecting the video shielded transport container in place transport vehicle: after the welding is confirmed to be finished, closing an air inlet and exhaust fan, moving a drying welding box pulley to an unloading position, descending a shielding transport container gripper head to enable the shielding transport container gripper head to completely enter a fuel basket central column, locking the gripper head, lifting the gripper head to the highest position, closing a shielding transport container shielding door, descending the shielding transport container gripper head to enable a fuel basket to be in place on the shielding transport container shielding door; the shielding transport container is placed in place by a crane of a plant 30T to transport the vehicle, the connection between the shielding transport container and the crane is released, and four fixed guide chains of the shielding transport container and the transport vehicle are tensioned;

step five: loading the fuel basket against a storage area;

step 5.1: transporting the shielding transport container to a spent storage area: opening a movable door of the extension workshop, starting a transport vehicle and moving to a storage area; closing the sliding door of the extension workshop;

step 5.2: the fuel basket is loaded into a designated storage cylinder for storage: after the transport vehicle arrives at the storage area, the transport vehicle stops at the side surface of the module storage barrel to be loaded, the on-site gantry main lifting hook is connected with the shielding transport container, the rain cover of the loaded storage barrel needs to be moved away in the prior art, and then the transport container guide support is installed; when the main lifting hook of the gantry crane is lifted to the position above the module, the crane is translated to enable the transport container to completely enter the guide support, the auxiliary lifting hook of the gantry crane is connected with the storage cylinder loading and unloading plug, all workers withdraw from the remote operation crane at the distance of 25 meters, the auxiliary lifting hook of the gantry crane is lifted, after the storage cylinder is completely lifted, the gantry lifting hook is horizontally moved, the storage cylinder loading and unloading plug and the transport container move together until the transport container reaches the stop block of the guide support and stops; an operator returns the loaded storage barrel, operates the transport container, lifts the gripper head of the transport container to a high position, opens the shielding door of the transport container, lights an indicator lamp after the gripper head of the transport container is completely in place and is lifted for 30mm and stabilized for three minutes, then lowers the gripper head for 30mm, releases the connection between the gripper head and the fuel basket, lifts the gripper head to the highest position, and closes the shielding door; the worker withdraws the remote operation at the position of 25 meters again, lifts the transport container, horizontally moves the crane moving device until the front part of the crane moving device completely enters the guide support, lowers the auxiliary lifting hook, so that the loading and unloading plug of the auxiliary lifting hook completely enters the storage cylinder, returns to the storage cylinder, releases the connection between the loading and unloading plug and the auxiliary lifting hook, continues to horizontally move the crane, positions the transport emptier on the transport vehicle, releases the connection between the main lifting hook and the shielding transport container, and recovers the fixation between the four guide chains and the transport vehicle;

step 5.3: returning the spent storage transportation vehicle to the extended workshop: opening the extension factory building and moving the door, the haulage vehicle gets into the extension factory building, closes the extension factory building and moves the door, utilizes the factory building crane to shift the transport container to stoving welding case top, continues loading of next fuel basket, makes a round trip to circulate.

The invention has the beneficial effects that:

the heavy water reactor spent fuel dry-type storage production method described in the invention is convenient to use, popular and easy to understand, has strong practicability, ensures the heavy water reactor spent fuel dry-type storage production to be safe and reliable, has high economic benefit, ensures the stable operation of a power station, optimizes and solidifies the production process through production experience summary for many years, greatly improves the efficiency, completely meets the existing storage requirements of spent storage, can popularize the advanced production method of spent fuel storage to similar power stations at home and abroad when low-level human events occur at last.

Drawings

Fig. 1 is a flow chart of a method of producing a dry storage of heavy water reactor spent fuel in accordance with the present invention.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1, the production method of the heavy water reactor spent fuel dry storage specifically comprises the following steps:

the method comprises the following steps: fuel basket transfer check launching (refer to flow chart A sequence)

Step 1.1: the new-fuel basket is transferred from the extension plant (new-fuel basket storage plant) to the spent fuel plant: transferring the new fuel basket from the extension factory building (new fuel basket storage factory building) to the spent fuel factory building by using a 2T hydraulic forklift;

step 1.2: removing the package, opening the basket cover, checking and measuring, and verifying the number: removing all packages of the fuel basket, visually checking whether the surface of the fuel basket has defects or not, measuring the gap of a central hole by using a feeler gauge to be less than 2mm, and checking whether the base number of the basket cover number is consistent or not;

step 1.3: the fuel basket is positioned on the edge of the pool and drips: transferring the fuel basket to a water dripping tray at the side of a spent fuel pool by using a 2T annular crane and a short-handle fuel basket lifting tool, and unlocking and separating the short-handle fuel basket lifting tool and the fuel basket;

step 1.4: transferring the fuel basket to the underwater turret: connecting and locking a long-handle fuel basket operating tool with a fuel basket in a drip tray, connecting the upper part of the long-handle tool with a ring-shaped lifting hook, lifting the long-handle tool, moving a crane to descend above a water pool by about 1.5 m to enable an air-fuel basket to be filled with water and no bubbles to overflow, continuously descending the fuel basket to a position where an underwater rotary table is positioned, and unlocking the long-handle fuel basket operating tool;

step two: spent fuel loading fuel basket (refer to flow chart B sequence)

Step 2.1: opening the fuel basket cover underwater and storing the fuel basket cover at an idle position of an underwater platform: connecting the upper part of an underwater operation tool of the pneumatic fuel basket with a 2T man-bridge crane of a factory building, connecting an input electric pipeline plug, moving the underwater operation tool to the upper part of the fuel basket of the rotary table, contacting with a basket cover, closing a locking switch of the fuel basket cover, confirming that four hooks of the tool completely clamp the edge of the basket cover, and lifting the basket cover to be in place at an idle position of an underwater platform;

step 2.2: the full-load fuel tray is positioned in the tipping machine, and the tipping machine is tipped to be in a vertical state: connecting the fuel tray transfer tool with a 2T passenger bridge crane, moving the fuel tray transfer tool to the position above a tray to be loaded according to a loading plan, connecting the fuel tray transfer tool with the 2T passenger bridge crane, lifting the safety height, transferring the fuel tray transfer tool to a tipping machine, confirming that four positioning holes of the tray completely enter positioning pins of the tipping machine, and removing the tray transfer tool; the tipper cover plate is lowered, the handle of the hand-operated tipper driving device is rotated for about 22 circles, and the tipper is confirmed to be 90 degrees.

Step 2.3: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting a pressure-relief pipeline input plug, confirming normal pressure (70PSI), moving a crane, confirming alignment of a gripping head of the bundle gripping tool with the upper part of the fuel bundle, descending the crane, confirming complete entry of the gripping head into the upper part of the fuel bundle, and pressing down a bundle gripping tool locking switch; lifting the balance crane by 0.75 meter, moving the balance crane above the fuel basket specified position hole channel on the rotary table of the balance crane, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 2.4: after the 12 bundles are loaded, the pallet is turned and brought into position on the tipper: after all 12 workpieces are grabbed and loaded in the step, the fuel tray needs to be reversed (24 bundles of the whole tray are symmetrically 12 on each side), a hand-operated tipping machine drives a handle to enable the tipping machine to be in a horizontal state, a tray transfer tool is connected with a 2T bridge crane on the side, a crane is moved onto the tray and connected with the tray, the tray transfer tool is rotated by 180 degrees after being lifted to a safe height, the fuel tray is lowered until four positioning holes of the tipping machine completely enter, and the tray is separated from the tray transfer tool;

step three: the fuel basket transfers water (refer to flow chart C sequence)

Step 3.1: putting down a cover plate of the tipper and tipping the tipper to be in a 90-degree vertical state: the tipper cover plate is lowered, the handle of the hand-operated tipper driving device is rotated for about 22 circles, and the tipper is confirmed to be 90 degrees.

Step 3.2: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting a pressure-relief pipeline input plug, confirming normal pressure (70PSI), moving a crane, confirming alignment of a gripping head of the bundle gripping tool with the upper part of the fuel bundle, descending the crane, confirming complete entry of the gripping head into the upper part of the fuel bundle, and pressing down a bundle gripping tool locking switch; lifting the balance crane to 0.75 m, moving the balance crane above the specified position hole channel of the fuel basket on the rotary table of the balance crane, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 3.3: after the 12 bundles are loaded, the empty tray is removed to the specified position: the hand-operated tipper drives a handle to enable the tipper to be in a horizontal state, the tray transfer tool is connected with the 2T bridge crane, the crane is moved to the tray and connected with the tray, and after the tray transfer tool is lifted to a safe height, the crane is moved to move the empty tray to a specified position for storage;

step 3.4: and repeating the second step and the third step until the loading of the 60 rod bundles is completed: lifting the planned loaded pallets by using the pallet transfer tool, operating the tipper to finish loading 60 straight pallets, and transferring the corresponding empty pallets to the specified positions for storage

Step four: fuel basket drying welding (refer to flow chart D sequence)

Step 4.1: the fuel basket cover is recovered and is positioned at the side D of the underwater transmission trolley (the dead pool is in a square shape, A, B, C, D represents four surfaces, wherein A is symmetrical to C, and B is symmetrical to D): after loading of 60 bundles of rods is completed, checking and confirming the integrity of the loaded bundles of rods (confirming the structural integrity of each bundle of rods) by using an underwater high-definition television, moving a pneumatic fuel basket operation tool to the upper part of a fuel basket of a rotary table, contacting with a basket cover, closing a fuel basket cover locking switch, confirming that four hooks of the tool completely block the edge of the basket cover, lifting the basket cover to the upper part of the fuel basket of the rotary table in place, confirming that a placing indicating lamp is on, and releasing the fuel basket cover locking switch; and locking the central column of the gripping head of the fuel basket, lifting the fuel basket to a safe height, and taking the fuel basket in place on the side of the underwater transport trolley D.

Step 4.2: the shielded transport container is just located at SWS (baking welding box), and the trolley is lifted to the B side under water to lift a fuel basket: the shielding transport container is moved to an SWS (baking welding box) by using a factory crane, a shielding door of the shielding transport container is opened, a rocking handle of an underwater transport trolley is driven to enable a fuel basket to reach a side B, a gripping head of an SWS chain crane is descended to enable the gripping head to completely enter a fuel basket central column, the gripping head is locked, and the fuel basket is lifted;

step 4.3: fuel basket washing, draining, drying and welding: after the fuel basket is lifted to a certain height, starting a cleaning device, cleaning the surface of the fuel basket and a chain of a chain crane, moving the chain crane up and down three times in a specified cleaning area, closing the cleaning device, lifting the fuel basket to the highest position, lighting an upper indicator lamp, moving an SWS pulley rotary table to the lower part of the fuel basket, descending the SWS pulley rotary table in place of the fuel basket, removing a gripper head of the chain crane, lifting the fuel basket to the highest position, ascending a lifting arm of the fuel basket (enabling a basket cover of the lifting arm to open some draining water), enabling the water in the fuel basket to be threadless, and descending the lifting arm of the fuel basket; moving the SWS pulley to a drying position, raising a fuel basket lifting arm again, starting a rotary table, confirming the serial number again, starting an exhaust fan, an air inlet fan and two electric heaters, turning off one electric heater when the temperature reaches 90 ℃, drying after about 45 minutes, turning off the electric heater, lowering the fuel basket lifting arm, moving the SWS pulley to a welding position, starting a welding system, welding down a welding seam firstly, welding up the welding seam, adjusting the positions of a welding gun and a tracker, adjusting an upper welding seam welding gun and the tracker after welding down the welding seam, and turning off the welding system after welding;

step 4.4: inspecting the video shielded transport container in place transport vehicle: after the welding is confirmed to be completed, the air inlet and exhaust fan is closed, the SWS pulley is moved to the unloading position, the gripper head of the shielding transportation container is descended to enable the gripper head to completely enter the fuel basket central column (observed by means of the video camera system in the SWS), the gripper head is locked, the gripper head is lifted to the highest position, the shielding transportation container shielding door is closed, and the gripper head of the shielding transportation container is descended to enable the fuel basket to be in place on the shielding transportation container shielding door. And (3) placing the shielding transport container in place by using a 30T crane of the plant, removing the connection between the shielding transport container and the crane, and tensioning four fixed guide chains of the shielding transport container and the transport vehicle.

Step five: fuel basket arrival storage area loading (see flow chart E sequence)

Step 5.1: transporting the shielding transport container to a spent storage area: opening a movable door of an extension workshop, starting a transport vehicle, carrying out escort along with the vehicle by a worker, preparing a guide vehicle of a security department, and after confirming that no problem exists, leading the vehicle to a storage area under the guidance of the vehicle (10KM/S) of the security department, wherein the route of the transport vehicle needs to be temporarily blocked to ensure safety; closing the sliding door of the extension workshop;

step 5.2: the fuel basket is loaded into a designated storage cylinder for storage: after the transport vehicle arrives at the storage area, the guidance of the security department is finished; the transport vehicle stops at the side face of the module storage barrel to be loaded, the field gantry main lifting hook is connected with the shielding transport container, the rain cover of the loaded storage barrel needs to be moved before, and then the transport container guide support is installed. When the main lifting hook of the gantry crane reaches the upper part of the module, the gantry crane is translated to enable the transport container to completely enter the guide support (a certain gap is reserved between the main lifting hook and the plane) for suspension, the auxiliary lifting hook of the gantry crane is connected with the storage cylinder loading and unloading plug, all workers leave 25 meters away (a remote operation crane), the auxiliary lifting hook of the gantry crane is lifted, after the storage cylinder is completely lifted, the gantry crane is horizontally moved, the storage cylinder loading and unloading plug and the transport container move together until the transport container reaches the stop block of the guide support, and the stop is realized. The operator returns the loaded storage cylinder, operates the transport container, lifts the transport container gripper head to a high position (the indicator light is on), opens the transport container shield door, lowers the transport container gripper head to the full position, then the indicator light is on, lifts the gripper head for 30mm after three minutes of stability (ensuring the fuel basket to be completely centered), releases the connection between the gripper head and the fuel basket, lifts the gripper head to the highest position, and closes the shield door. The worker withdraws the remote operation of 25 meters again, lifts the transport container to a certain height, lowers the auxiliary lifting hook when the horizontal moving crane moving device completely enters the guide support to the front, so that the loading and unloading plug of the auxiliary lifting hook completely enters the storage cylinder (shielding radioactivity), the worker returns to the storage cylinder, the connection between the loading and unloading plug and the auxiliary lifting hook is released, the horizontal moving crane is continued, the transport aircraft is positioned on the transport vehicle, the connection between the main lifting hook and the shielding transport container is released, and the fixation between the four guide chains and the transport vehicle is recovered.

Step 5.3: returning the spent storage transportation vehicle to the extended workshop: and opening the extension plant sliding door, enabling the transport vehicle to enter the extension plant, closing the extension plant sliding door, transferring the transport container to the upper side of the SWS by using a plant crane, continuing loading the next fuel basket, and circulating back and forth.

When each storage area storage cylinder finishes loading 10 fuel baskets by the method, the storage cylinder loading and unloading plug and the permanent shielding plug need to be replaced, then the storage cylinder is sealed and welded, the permanent shielding plug and the storage cylinder are welded together, after welding is finished, service staff need to carry out PT \ permeation inspection on a welding seam, after inspection is free of problems, the storage cylinder is mounted on a rain cover for welding, and after welding is finished, PT \ permeation inspection also needs to be carried out.

The foregoing is only a preferred embodiment of the present invention, and is described herein: process modifications and structural adaptations based on the principles of the present invention are considered to be within the scope of the present invention.

Claims (1)

1. A production method for dry storage of heavy water reactor spent fuel specifically comprises the following steps:

the method comprises the following steps: the fuel basket is transferred to check launching;

step 1.1: transfer of new-fuel baskets from the extension plant to the spent fuel plant: transferring the new fuel basket from the extension workshop to the spent fuel workshop by using a 2T hydraulic forklift;

step 1.2: removing the package, opening the basket cover, checking and measuring, and verifying the number: removing all packages of the fuel basket, visually checking whether the surface of the fuel basket has defects, measuring the gap of a central hole by using a feeler gauge to be less than 2mm, and checking whether the number of the basket cover is consistent with that of the base;

step 1.3: the fuel basket is positioned on the edge of the pool and drips: transferring the fuel basket to a water dripping tray at the side of a spent fuel pool by using a 2T annular crane and a short-handle fuel basket lifting tool, and unlocking and separating the short-handle fuel basket lifting tool and the fuel basket;

step 1.4: transferring the fuel basket to the underwater turret: connecting and locking a long-handle fuel basket operating tool with a fuel basket in a drip tray, connecting the upper part of the long-handle tool with a ring-shaped lifting hook, lifting the long-handle tool, moving a crane to descend above a water pool by 1.5 meters, so that an air-fuel basket is filled with water and no bubbles overflow, continuously descending the fuel basket to a position of an underwater rotary table, and unlocking the long-handle fuel basket operating tool;

step two: a spent fuel loading basket;

step 2.1: opening the fuel basket cover underwater and storing the fuel basket cover at an idle position of an underwater platform: connecting the upper part of an underwater operation tool of the pneumatic fuel basket with a 2T man-bridge crane of a factory building, connecting an input electric pipeline plug, moving the underwater operation tool to the upper part of the fuel basket of the rotary table, contacting with a basket cover, closing a locking switch of the fuel basket cover, confirming that four hooks of the tool completely clamp the edge of the basket cover, and lifting the basket cover to be in place at an idle position of an underwater platform;

step 2.2: the full-load fuel tray is positioned in the tipping machine, and the tipping machine is tipped to be in a vertical state: connecting the fuel tray transfer tool with a 2T passenger bridge crane, moving the fuel tray transfer tool to the position above a tray to be loaded according to a loading plan, connecting the fuel tray transfer tool with the 2T passenger bridge crane, lifting the safety height, transferring the fuel tray transfer tool to a tipping machine, confirming that four positioning holes of the tray completely enter positioning pins of the tipping machine, and removing the tray transfer tool; putting down the cover plate of the tipper, and turning 22 circles of the driving device handle of the hand-operated tipper to confirm that the tipper is 90 degrees relative to the underwater platform;

step 2.3: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting an input plug of a pressure-relief pipeline, confirming normal pressure, moving a crane, confirming that a gripping head of the bundle gripping tool is aligned with the upper part of the fuel bundle, descending the crane, confirming that the gripping head completely enters the upper part of the fuel bundle, and pressing a bundle gripping tool locking switch; lifting the balance crane by 0.75 meter, moving the fuel basket on the turntable of the balance crane to the position above the hole channel at the specified position, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 2.4: after the 12 bundles are loaded, the pallet is turned and brought into position on the tipper: repeating the steps until 12 fuel trays are completely grabbed and loaded, reversing the fuel trays, driving a handle by a hand-operated tipper to enable the tipper to be in a horizontal state, connecting a tray transfer tool with a 2T bridge crane, moving a crane onto the trays and connecting the crane with the trays, lifting the tray transfer tool to a safe height, rotating the tray transfer tool by 180 degrees, descending the fuel trays until the four positioning holes of the tipper completely enter, and separating the trays from the tray transfer tool;

step three: the fuel basket transfers water;

step 3.1: putting down a cover plate of the tipper and tipping the tipper to be in a 90-degree vertical state: putting down the cover plate of the tipper, and turning 22 circles of the driving device handle of the hand-operated tipper to confirm that the tipper is 90 degrees relative to the underwater platform;

step 3.2: grasping a designated location on the fuel tray where the bundle of rods is loaded into the fuel basket: connecting a fuel bundle gripping tool with a pneumatic balance crane hook, connecting an input plug of a pressure-relief pipeline, confirming normal pressure, moving a crane, confirming that a gripping head of the bundle gripping tool is aligned with the upper part of the fuel bundle, descending the crane, confirming that the gripping head completely enters the upper part of the fuel bundle, and pressing a bundle gripping tool locking switch; lifting the balance crane to 0.75 m, moving the balance crane above the specified position hole channel of the fuel basket on the rotary table of the balance crane, descending the balance crane, unlocking the gripping tool after the balance crane is in place, lifting the gripping tool, moving the balance crane to the position above the tipper, and continuously gripping the fuel rod bundle, wherein the method is the same as that of the previous balance crane;

step 3.3: after the 12 bundles are loaded, the empty tray is removed to the specified position: the hand-operated tipper drives a handle to enable the tipper to be in a horizontal state, the tray transfer tool is connected with the 2T bridge crane, the crane is moved to the tray and connected with the tray, and after the tray transfer tool is lifted to a safe height, the crane is moved to move the empty tray to a specified position for storage;

step 3.4: repeating the second step and the third step until the loading of the 60 rod bundles is completed: lifting the planned loaded trays by using a tray transfer tool, operating the tipping machine to finish loading 60 straight trays, and transferring the corresponding empty trays to a specified position for storage;

step four: drying and welding the fuel basket;

step 4.1: resume fuel basket lid, just be located transmission dolly D side under water: after loading of 60 bundles, checking and confirming the integrity of the loaded bundles by using an underwater high-definition television, moving a pneumatic fuel basket operation tool to the position above the turntable fuel basket, contacting with a basket cover, closing a fuel basket cover locking switch, confirming that four hooks of the tool completely clamp the edge of the basket cover, lifting the basket cover to the position above the turntable fuel basket, confirming that a positioning indicating lamp is on, and releasing the fuel basket cover locking switch; locking a central column of a gripping head of the fuel basket, lifting the fuel basket to a safe height, and positioning the fuel basket on the side of the underwater transport trolley D;

step 4.2: shielding transport container just lies in the stoving welding case, and dolly to B side under water lifts by crane the fuel basket: moving the shielding transport container to a drying welding box by using a factory crane, opening a shielding door of the shielding transport container, driving a rocking handle of the underwater transport trolley to enable a fuel basket of the underwater transport trolley to reach the side B, descending a gripper head of a chain crane of the drying welding box to enable the gripper head of the underwater transport trolley to completely enter a fuel basket central column, locking the gripper head and hoisting the fuel basket;

step 4.3: fuel basket washing, draining, drying and welding: after the fuel basket is lifted, starting a cleaning device, cleaning the surface of the fuel basket and a chain of a chain crane, moving the chain crane up and down three times in a specified cleaning area, closing the cleaning device, lifting the fuel basket to the highest position, lighting an upper indicator lamp, moving a drying welding box pulley rotating table to the lower part of the fuel basket, descending the fuel basket in place, drying the welding box pulley rotating table, removing a gripping head of the chain crane, lifting the fuel basket to the highest position, ascending a lifting arm of the fuel basket, enabling the water inside the fuel basket to have no line shape, and descending the lifting arm of the fuel basket; moving a dry welding box pulley to a drying position, lifting a fuel basket lifting arm again, starting a rotary table, confirming the serial number again, starting an exhaust fan, an air inlet fan and two electric heaters, when the temperature reaches 90 ℃, closing one electric heater, completing drying, closing the electric heater, descending the fuel basket lifting arm, moving the dry welding box pulley to the welding position, starting a welding system, welding down a welding seam firstly, welding up the welding seam, adjusting the positions of a welding gun and a tracker, adjusting an upper welding seam welding gun and the tracker after welding down the welding seam, and closing the welding system after welding;

step 4.4: shielded transport container in-place transport vehicle: after the welding is confirmed to be finished, closing an air inlet and exhaust fan, moving a drying welding box pulley to an unloading position, descending a shielding transport container gripper head to enable the shielding transport container gripper head to completely enter a fuel basket central column, locking the gripper head, lifting the gripper head to the highest position, closing a shielding transport container shielding door, descending the shielding transport container gripper head to enable a fuel basket to be in place on the shielding transport container shielding door; the shielding transport container is placed in place by a crane of a plant 30T to transport the vehicle, the connection between the shielding transport container and the crane is released, and four fixed guide chains of the shielding transport container and the transport vehicle are tensioned;

step five: loading the fuel basket against a storage area;

step 5.1: transporting the shielding transport container to a spent storage area: opening a movable door of the extension workshop, starting a transport vehicle and moving to a storage area; closing the sliding door of the extension workshop;

step 5.2: the fuel basket is loaded into a designated storage cylinder for storage: after the transport vehicle arrives at the storage area, the transport vehicle stops at the side surface of the module storage barrel to be loaded, the on-site gantry main lifting hook is connected with the shielding transport container, the rain cover of the loaded storage barrel needs to be moved away in the prior art, and then the transport container guide support is installed; when the main lifting hook of the gantry crane is lifted to the position above the module, the crane is translated to enable the transport container to completely enter the guide support, the auxiliary lifting hook of the gantry crane is connected with the storage cylinder loading and unloading plug, all workers withdraw from the remote operation crane at the distance of 25 meters, the auxiliary lifting hook of the gantry crane is lifted, after the storage cylinder is completely lifted, the gantry lifting hook is horizontally moved, the storage cylinder loading and unloading plug and the transport container move together until the transport container reaches the stop block of the guide support and stops; an operator returns the loaded storage barrel, operates the transport container, lifts the gripper head of the transport container to a high position, opens the shielding door of the transport container, lights an indicator lamp after the gripper head of the transport container is completely in place and is lifted for 30mm and stabilized for three minutes, then lowers the gripper head for 30mm, releases the connection between the gripper head and the fuel basket, lifts the gripper head to the highest position, and closes the shielding door; the worker withdraws the remote operation at the position of 25 meters again, lifts the transport container, horizontally moves the crane moving device until the front part of the crane moving device completely enters the guide support, lowers the auxiliary lifting hook, so that the loading and unloading plug of the auxiliary lifting hook completely enters the storage cylinder, returns to the storage cylinder, releases the connection between the loading and unloading plug and the auxiliary lifting hook, continues to horizontally move the crane, positions the transport emptier on the transport vehicle, releases the connection between the main lifting hook and the shielding transport container, and recovers the fixation between the four guide chains and the transport vehicle;

step 5.3: returning the spent storage transportation vehicle to the extended workshop: opening the extension factory building and moving the door, the haulage vehicle gets into the extension factory building, closes the extension factory building and moves the door, utilizes the factory building crane to shift the transport container to stoving welding case top, continues loading of next fuel basket, makes a round trip to circulate.

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