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Molten salt reactor core refueling management method

A management method and molten salt reactor technology, applied in the field of molten salt reactor core fuel management, can solve problems affecting power peak factor, affecting power output, and the utilization rate of molten salt fuel needs to be improved, so as to improve utilization rate and safety The effect of the characteristic

Active Publication Date: 2020-01-14
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. The fuel consumption of solid fuel components (axial and radial) is not uniform. If the water-uranium ratio is changed, the power peak factor will be affected, and then the power output will be affected
[0004] The above factors have all affected the fuel utilization rate in the prior art, so the utilization rate of molten salt fuel in the prior art needs to be improved

Method used

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  • Molten salt reactor core refueling management method
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  • Molten salt reactor core refueling management method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Such as image 3 , the number of molten salt reactors 1 participating in the operation is two. When a single reactor is running, the core fuel salt volume ratio of the first molten salt reactor 11 is 19%, and the number of operating days is 626 days. When the accumulated fuel salt heavy metal concentration When the molar ratio is 3%, the fuel salt is unloaded from the first molten salt pile 11 and reloaded into the second molten salt pile 12 for operation. This step is to load the fuel salt 22 discharged from the first molten salt pile. . The core fuel salt volume ratio of the second molten salt reactor 12 is 15%, and when the cumulative fuel salt heavy metal concentration molar ratio is 12%, the fuel salt stops running. When multiple stacks are running at the same time, the core fuel salt volume ratio of the first molten salt reactor 11 is 19%, and the number of operation days is 626 days. The salt pile is unloaded, and new fuel salt is reloaded to start operation, a...

Embodiment 2

[0055] Similar to Example 1, the number of molten salt reactors participating in the operation is two. When a single reactor is running, the core fuel salt volume ratio of the first molten salt reactor is 15%, and the number of operating days is 2101 days. When the accumulated fuel salt heavy metal When the concentration molar ratio is 7%, the fuel salt is unloaded from the first molten salt reactor and reloaded into the second molten salt reactor for operation. The core fuel salt volume ratio of the second molten salt reactor is 10%. When the molar ratio of the heavy metal concentration in the fuel salt is 12%, the fuel salt stops running. For the simultaneous operation of multiple stacks, refer to the multi-stack operating mode of Embodiment 1 accordingly.

[0056] During the entire fuel salt operation life, the maximum total temperature coefficient changes from -0.01pcm / K in single-stack (10% fuel-salt volume ratio) operation to -0.55pcm / K in multi-stack operation. paramet...

Embodiment 3

[0058] Such as Figure 4 , the number of molten salt reactors 1 participating in the operation is three, and when a single reactor is in operation, the step of installing new fuel 21 is carried out. The core fuel salt volume ratio of the first molten salt reactor 11 is 19%, and the number of operation days is 294 days. When the cumulative fuel salt heavy metal concentration molar ratio is 2%, the fuel salt is unloaded from the first molten salt reactor and restarted. loaded into the second molten salt reactor operation, see Figure 4 The steps in are loaded with the fuel salt 22 discharged from the first molten salt reactor. The core fuel salt volume ratio of the second molten salt pile 12 is 15%. When the cumulative fuel salt heavy metal concentration molar ratio is 6%, the fuel salt is discharged from the second molten salt pile and reloaded into the third one. Molten salt reactor 13 operation, see Figure 4 The steps in the process are loaded with the fuel salt 23 discha...

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Abstract

The invention discloses a molten salt reactor core refueling management method, wherein an adopted molten salt reactor comprises a reactor core. The molten salt reactor core refueling management method comprises the following steps: according to the control ability of the residual reactivity of each molten salt reactor, the heavy metal concentration molar ratio of fuel salt is determined, and thevolume ratio of the fuel salt of the molten salt reactor core is set to be 1%-30%; along with the increase of the heavy metal concentration molar ratio of the fuel salt in operation, when the fuel salt reactor change is carried out, a molten salt reactor with a smaller reactor core fuel salt volume ratio is replaced, andthe fuel salt continues operation is carried out; and the step ofreactor changing is carried out until the fuel salt reaches the end of the service life, the fuel salt is discharged, and the operation of the fuel salt is ended. According to the molten salt reactor core refueling management method, the advantages of each reactor energy spectrum are fully utilized, the utilization rate of nuclear fuel is increased, and meanwhile, the safety characteristic of the reactor coreis improved.

Description

technical field [0001] The invention relates to the field of molten salt reactor core fuel management, in particular to a molten salt reactor core refueling management method. Background technique [0002] Solid fuel reactors such as pressurized water reactors are refueled in batches. When refueling, a new batch of fuel assemblies is put into the core, and the batch of components with the longest burn-up time is discharged from the core. Each batch in the core Fuel assemblies move according to established rules. The pebble bed stack generally adopts the fuel management method of continuous loading and unloading of multiple cycles. [0003] When refueling a solid fuel reactor (taking the PWR as an example), the main limiting factors are: 1. Affected by the inherent safety, the PWR cannot operate in the over-moderated zone. Therefore, the range of change in the specific energy of water and uranium is limited ; 2. Increasing the ratio of water to uranium can improve fuel util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/34
CPCG21C19/34Y02E30/30
Inventor 于世和朱贵凤严睿刘亚芬周波邹杨
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI