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Reactor core structure, molten-salt pebble bed reactor and fuel management and reactor core loading method of molten-salt pebble bed reactor

A core structure and molten salt technology, applied in the direction of reactor fuel elements, fuel elements, reactors, etc., can solve the problems of complex purification of fuel balls, insufficient reliability of devices, and complex devices, so as to reduce the risk of reactor control and maintain the reactor Effect of core stability and fewer loading times

Pending Publication Date: 2019-03-22
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

[0007] The technical problem to be solved by the present invention is to overcome the defects of complicated device, high radioactivity, insufficient reliability of the device and complex fuel ball purification after the existing online flow refueling method is applied to the fluoride-salt cooled high-temperature reactor, and to provide a A new type of core structure, molten salt pebble bed reactor and fuel management and core loading method of molten salt pebble bed reactor

Method used

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  • Reactor core structure, molten-salt pebble bed reactor and fuel management and reactor core loading method of molten-salt pebble bed reactor
  • Reactor core structure, molten-salt pebble bed reactor and fuel management and reactor core loading method of molten-salt pebble bed reactor
  • Reactor core structure, molten-salt pebble bed reactor and fuel management and reactor core loading method of molten-salt pebble bed reactor

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Experimental program
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Effect test

Embodiment 1

[0072] (1) Core structure

[0073] Such as figure 1 and figure 2 In the shown core structure, the active zone 1 of the core structure is provided with a feed inlet at the bottom and a discharge outlet at the top, the density of the fuel balls in the active zone 1 is less than the density of the molten salt in the active zone 1, and the activity Zone 1 is capable of accommodating fuel loads greater than the preset number of days of full power operation.

[0074] The above core structure also includes graphite balls with the same size and density as the fuel balls; the fuel balls, graphite balls and molten salt all enter the active zone 1 through the feed port. Fuel balls, graphite balls and molten salt are all discharged from the active area 1 through the discharge port.

[0075] In the above core structure, the molten salt in the molten salt pebble bed reactor is fluorine salt, and the fluorine salt is 2LiF-BeF 2 Molten salt, 2LiF-BeF 2 Molten salt made of LiF and BeF 2...

Embodiment 2

[0119] (1) The core structure is the same as in Embodiment 1

[0120] (2) molten salt pellet bed heap is the same as embodiment 1

[0121] (3) Fuel management and core loading method

[0122] Such as image 3 Fuel management and core loading method of the molten salt pebble bed reactor shown, fuel management and core loading method in the above molten salt pebble bed reactor (such as figure 1 and figure 2 as shown);

[0123] The fuel management and core loading method includes the following steps:

[0124] S1: Loading fuel spheres into the active area 1; wherein, the loading amount of the fuel spheres is equal to the fuel loading amount equal to the preset number of days of full-power operation;

[0125] S2: According to the critical extrapolation experiment, check whether the core has reached the preset initial backup reactivity;

[0126] After detection, it is found that the preset initial backup reactivity has been reached, and then it is judged whether the active ar...

Embodiment 3

[0135] (1) Core structure

[0136] as 1 and figure 2 In the shown core structure, the active zone 1 of the core structure is provided with a feed inlet at the bottom and a discharge outlet at the top, the density of the fuel balls in the active zone 1 is less than the density of the molten salt in the active zone 1, and the activity Zone 1 is capable of accommodating fuel loads greater than the preset number of days of full power operation.

[0137] The above core structure also includes graphite balls with the same size and density as the fuel balls; the fuel balls, graphite balls and molten salt all enter the active zone 1 through the feed port. Fuel balls, graphite balls and molten salt are all discharged from the active area 1 through the discharge port.

[0138] In the above core structure, the molten salt in the molten salt pebble bed reactor is fluorine salt, and the fluorine salt is 2LiF-BeF 2 Molten salt, 2LiF-BeF 2 Molten salt made of LiF and BeF 2 Composition,...

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Abstract

The invention discloses a reactor core structure, a molten-salt pebble bed reactor and a fuel management and reactor core loading method of the molten-salt pebble bed reactor. An active region of thereactor core structure is provided with a charging opening located at bottom and a discharging opening located at top, the density of fuel spheres in the active region is lower than that of a molten salt in the active region, and fuel inventory capable of being contained by the active region is greater than preset fuel inventory of full-power operating days. According to the reactor core structure, the global unloading of the fuel spheres at lifespan ends can be achieved, and components achieving an online reloading function are not required, so that the device can be simple; the fuel spheres,which are subjected to global unloading at the lifespan ends, have no need of being treated one by one and directly enter a spent fuel treatment system, so that radioactivity can be lowered, the reliability of the device is improved, and thus, the purification of the fuel spheres can become simple; due to the reactor core structure, the fuel management and reactor core loading method can have anadjusting margin, and a running target is guaranteed.

Description

technical field [0001] The invention relates to a core structure, a molten salt pebble bed stack and a fuel management and core loading method of the molten salt pebble bed stack. Background technique [0002] Based on the requirements of sustainability, economy, safety, reliability and non-proliferation of the fourth-generation nuclear energy system at the beginning of this century, the fluoride-salt cooled high-temperature reactor was proposed as an advanced reactor concept. The concept of fluoride salt originated from the ARE (Aircraft Reactor Experiment), MSRE (MoltenSalt Reactor Experiment), MSBR (Molten Salt Breeder Reactor), DMSR (DenaturedMolten Salt Reactor) designed and built by Oak Ridge Laboratory (ORNL) in the United States from the 1950s to the 1970s. ) and other liquid fluorine salt fuel molten salt experimental reactors, but because the fluorine salts and fuel in this experimental reactor are completely mixed together, there are factors such as complex on-lin...

Claims

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Application Information

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IPC IPC(8): G21C1/22G21C3/20G21C3/07G21C15/14G21C7/10
CPCG21C1/22G21C3/07G21C3/20G21C7/10G21C15/14Y02E30/30
Inventor 严睿邹杨于世和杨璞周波冀锐敏刘亚芬
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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