CN1323405C - Material changing, loading and unloading process flow for fuel assembly of straight-moving nuclear reactor - Google Patents

Abstract

The present invention belongs to a kind of nuclear reactor fuel assembly refueling loading and unloading, that is, a straight nuclear reactor fuel assembly refueling loading and unloading process. It includes the reception, inspection and storage of new fuel assemblies, core refueling, storage and delivery of spent fuel assemblies. The core refueling and storage and delivery of spent fuel assemblies are completed by a numerically controlled loading and unloading machine walking on a magnetic slide rail arranged between the reactor building and the fuel building. The refueling loading and unloading process does not require underwater turning of the fuel assembly, and can save special equipment such as underwater turning machine, nuclear fuel carrier, nuclear fuel transmission pipe and transfer pool, and man-bridge crane for spent fuel hoisting. In addition, the refueling operation process is simple, reliable, safe and fast. It can be directly used in nuclear power plants, nuclear heating reactors, nuclear seawater desalination plants, research reactors, nuclear power plants, and production reactors, and can improve the refueling efficiency of nuclear reactors, reduce the cost of the refueling system and the labor intensity of operators, and improve the economy of the reactor.

Description

Refueling and loading and unloading process of straight nuclear reactor fuel assembly

technical field

The invention belongs to the improvement of a nuclear reactor fuel assembly refueling loading and unloading process flow.

Background technique

The existing pressurized water reactor nuclear power plants in my country, such as Qinshan Nuclear Power Plant and Daya Bay Nuclear Power Plant, use the underwater turning process to realize the transfer of fuel components between the nuclear reactor building and the fuel building. This refueling process and its system are complicated, have poor reliability, take a long time for refueling, and have a high probability of fuel assembly hoisting accidents, which pose a great threat to nuclear safety. The Tianwan NPP has no fuel building, and new fuel assemblies are stored above the solid waste repository, while spent fuel assemblies are stored in the spent fuel pool of the reactor building. Fuel loading and unloading and storage do not have the problem of transshipment of old and new fuel assemblies between the stack building and the fuel building. It uses a numerically controlled loading and unloading machine to walk between the water pool in the reactor building and the spent fuel pool to complete the loading, unloading and placement of fuel assemblies. Its technological feature is that most of the refueling operations are concentrated in the reactor building. Using this refueling operation process cannot operate the spent fuel assemblies located in the spent fuel pool in the reactor building when the reactor is running, which is not conducive to the control of the temperature and humidity of the reactor building, and increases the radioactive dose level of the reactor building.

Contents of the invention

The object of the present invention is to provide a refueling loading and unloading technological process for straight nuclear reactor fuel assemblies with simple refueling operation process, fast time, safety and reliability.

The invention is realized in the following way: a process flow for fuel assembly refueling and loading and unloading of a straight-running nuclear reactor, including acceptance, inspection and storage of new fuel assemblies; core refueling; storage and delivery of spent fuel assemblies. Wherein, the core refueling and the storage and delivery of spent fuel assemblies are completed by a numerically controlled loading and unloading machine walking on a magnetic slide rail set between the reactor building and the fuel building. Specifically: a kind of refueling loading and unloading technological process of straight nuclear reactor fuel assembly, it is characterized in that it comprises:

(1) Acceptance, inspection and storage of new fuel assemblies, that is, the fuel transport container containing new fuel assemblies is hoisted by the fuel plant crane to the fuel tanking pool, and the new fuel assemblies are hoisted from the tank to the new fuel assembly pool by the auxiliary crane of the fuel plant. Check and store the fuel assembly inspection and storage room, and transfer the new fuel assembly to the designated rack position of the spent fuel storage pool before refueling;

(2) For core refueling, when the reactor is shut down, open the connecting gate between the reactor pool in the reactor building and the reactor internals storage pool, and remove the top cover of the reactor pressure vessel and the control rod drive mechanism before performing the refueling operation , some reactor internal components, etc., are stored in the reactor internal component storage pool, and the refueling gate between the reactor building and the fuel building is opened, and the material is loaded and unloaded by numerical control on the magnetic slide rail set between the reactor building and the fuel building when refueling The machine grabs the spent fuel assembly from the core and transports it to the spent fuel storage pool for temporary storage, and then uses the numerical control loading and unloading machine to grab the new fuel assembly from the spent fuel storage pool to the reactor pool for stacking operation;

(3) For the storage and delivery of spent fuel assemblies, when the reactor is running, the refueling gate between the reactor building and the fuel building and the connecting gate between the reactor water pool and the reactor internals storage pool are closed, and the numerical control loading and unloading machine The spent fuel assemblies are taken from the fuel storage pool and transported to the fuel filling pool for canning and delivery.

The refueling and loading and unloading process of the straight nuclear reactor fuel assembly does not require the underwater turning of the fuel assembly, which can save a large number of dedicated underwater turning machines, nuclear fuel carriers, nuclear fuel transfer pipes, nuclear fuel transfer pools, spent fuel hoisting bridge cranes, etc. The equipment can store and send spent fuel assemblies without stacking, and the refueling operation process is simple, reliable and safe, and the time is fast. The refueling efficiency of the nuclear reactor can be improved, the cost of the refueling system and the labor intensity of the operator can be reduced, and the economic efficiency of the reactor can be improved.

Description of drawings

Fig. 1 is a front view of the fuel assembly refueling operation process building of a straight-running nuclear reactor;

Fig. 2 is a top view of the fuel assembly refueling operation process building of a straight-running nuclear reactor.

In the figure, 1 reactor pressure vessel, 2 reactor internal component storage pool, 3 digital display type magnetic slide rail positioning numerical control loading and unloading machine, 4 spent fuel storage pool, 5 fuel tanking pool, 6 magnetic slide rail, 7 reactor building, 8 Fuel plant, 9 reactor pools, 10 connecting gates, 11 refueling gates, 12 new fuel inspection and storage rooms.

Detailed ways

As shown in Fig. 1 and Fig. 2, a process flow for refueling and loading and unloading of fuel assemblies of a straight nuclear reactor includes the following operations:

(1) The fuel transport container with new fuel assemblies is hoisted by a 130-ton fuel plant crane to the fuel tank pool 5; the 5-ton fuel plant auxiliary crane lifts the new fuel assemblies from the tank to the new fuel inspection and storage room 12 Carry out inspection and storage; before refueling, transfer the new fuel assembly to the designated grid position of the spent fuel storage pool 4 for storage.

(2) When the reactor is shut down, open the connecting gate 10 between the reactor pool 9 in the reactor building 7 and the reactor internals storage pool 2, and remove the top cover of the reactor pressure vessel 1 and the control rod drive mechanism before performing the refueling operation , some stack internals, etc., are stored in the stack internals storage pool 2. The refueling gate 11 between the reactor building 7 and the fuel building 8 is opened. During refueling, the spent fuel assembly is grabbed from the core by the numerical control loading and unloading machine 3 and transported to the spent fuel storage pool 4 for temporary storage, and then the new fuel assembly is picked up by the numerical control loading and unloading machine 3 from the spent fuel storage pool 4 to the reactor Pool 9 carries out stacking operation.

(3) When the reactor is running, the refueling gate 11 between the reactor building 7 and the spent fuel building 9 and the connecting gate 10 between the reactor water pool 9 and the reactor internals storage pool 2 are all closed. The numerical control loading and unloading machine 3 can be operated between the spent fuel storage pool 4 and the fuel filling pool 5 of the fuel plant 8, and the spent fuel assemblies are taken out from the spent fuel storage pool 4 and transported to the fuel filling pool 5 for filling and sending. These operations do not affect the normal operation of the reactor.

All the above operations were carried out under TV monitoring.

The refueling and loading and unloading process flow of the direct-running nuclear reactor fuel assembly provided by the present invention can be directly applied to nuclear power plants, nuclear heating reactors, nuclear heating seawater desalination plants, research reactors, nuclear power plants, and production reactors. The refueling efficiency of the nuclear reactor can be improved, the cost of the refueling system can be reduced, the labor intensity of operators can be reduced, and the economy of the reactor can be improved.

Claims (1)

1. A process flow for refueling and loading and unloading of straight nuclear reactor fuel assemblies, characterized in that it comprises: (1) Acceptance, inspection and storage of new fuel assemblies, that is, the fuel transport container containing new fuel assemblies is hoisted by the fuel plant crane to the fuel tanking pool (5), and the new fuel assemblies are hoisted from the tank by the auxiliary crane of the fuel plant Transport to the new fuel assembly inspection and storage room (12) for inspection and storage, and transfer the new fuel assembly to the designated grid position of the spent fuel storage pool (4) before refueling; (2) Core refueling, when the reactor is shut down, open the connection gate (10) between the reactor pool (9) in the reactor building (7) and the reactor internals storage pool (2), and perform the refueling operation Remove the top cover of the reactor pressure vessel (1), the control rod drive mechanism, and some reactor internals, etc., and store them in the reactor internals storage pool (2), and replace the reactor building (7) with the fuel building (8). The material gate (11) is opened, and the spent fuel assembly is grabbed from the core by the numerical control loading and unloading machine (3) on the magnetic slide rail (6) arranged between the reactor building (7) and the fuel building (8) during refueling Transport to the spent fuel storage pool (4) for temporary storage, and then use the numerical control loading and unloading machine (3) to grab the new fuel assembly from the spent fuel storage pool (4) to the reactor pool (9) for stacking operation; (3) For the storage and delivery of spent fuel assemblies, when the reactor is running, the refueling gate (11) between the reactor building (7) and the fuel building (8), the reactor water pool (9) and the reactor internals storage pool ( 2) The connecting gates (10) are all closed, and the numerical control loading and unloading machine (3) takes out the spent fuel assembly from the spent fuel storage pool (4) and transports it to the fuel tanking pool (5) for canning and sending.