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External cooling test system and method for pressure vessel

A pressure vessel and external cooling technology, applied in nuclear reactor monitoring, reactors, nuclear power generation, etc., can solve problems such as difficult to achieve one-dimensional slice heat flux

Active Publication Date: 2018-01-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat flux on the outer surface of a three-dimensional hemisphere is difficult to achieve the heat flux of a one-dimensional slice due to space constraints
[0004] To sum up, the existing test system includes one-dimensional slices and reduced-scale three-dimensional hemispherical test pieces, etc., and the heat flux of the former can reach 2.4MW / m 2 , the latter can only reach a maximum heat flux of 2.0MW / m 2

Method used

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  • External cooling test system and method for pressure vessel
  • External cooling test system and method for pressure vessel
  • External cooling test system and method for pressure vessel

Examples

Experimental program
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Effect test

no. 1 example

[0039] Such as figure 1 As shown, the test piece 1 is provided with a flow channel structure 3 outside and placed in the test water tank 2. A second electric heater 502 is arranged in the test water tank 2, and a bypass pipe between the upper part of the test water tank 2 and the upper part of the spare water tank 6 A 404 valve and a third flow meter 203 are installed on it, and the test water tank 2 is connected to a nitrogen source 5. The connecting pipe is equipped with a 407 valve, a 410 valve and a second pressure sensor 702; the lower part of the test water tank 2 passes through the water pump 301, A flow meter 201 and 403 valves are connected to the lower part of the standby water tank 6; the upper part of the standby water tank 6 is connected to the lower part of the deionized water equipment 7 through the 401 valve; the top of the standby water tank 6 is connected to the air cooler 8 through the 402 valve and the first temperature sensor 601; The device 8 is then connec...

no. 2 example

[0052] Image 6 It is a schematic diagram of a pressure vessel external cooling test system provided by the second embodiment of the present invention. The structure of this embodiment is basically the same as that of the first embodiment. The main difference is that the length of the liquid metal nozzle 106 is different. In the first embodiment, the outlet of the liquid metal nozzle 106 is arranged on the top of the test piece 1; In the example, the outlet of the liquid metal nozzle 106 is at the bottom of the test piece 1. In this embodiment, the liquid metal 108 can be transported into the high temperature molten pool 4 by injecting nitrogen into the test piece 1, so that the lower head 107 of the pressure vessel can be replaced. Therefore, the lower head of pressure vessel with different variable thickness designs can be studied, and the boiling heat transfer performance of the outer structure surface of the lower head of different pressure vessels can be studied, so as to ...

no. 3 example

[0054] Figure 7-Figure 11 It is a schematic diagram of another pressure vessel external cooling test system provided by the third embodiment of the present invention. The structure of this embodiment is basically the same as that of the first embodiment. The main difference is that this embodiment adds a baffle 111 inside the lower head of the pressure vessel, and the shape of the baffle in each figure is different; A high-temperature heat insulation layer is arranged between the inner surface of the lower head 107 of the pressure vessel, so that most of the heat is transferred to the local area of ​​the lower head of the pressure vessel, and the relationship between the average heat flux and the wall temperature in different zones can be studied. The relationship between the average heat flux density of the outer surface of the lower head 107 of the pressure vessel and the inclination angle is obtained. Therefore, it is possible to accurately evaluate whether the critical he...

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Abstract

The invention discloses an external cooling test system and method for a pressure vessel and belongs to the technical field of external cooling of the pressure vessel. The test system comprises a testpiece, a high-temperature molten pool, a cooling water supply loop, a steam cooling loop, a nitrogen source as well as a corresponding power distribution cabinet, instrument control equipment and data collection equipment. The test method comprises steps as follows: metal in the high-temperature molten pool is molten into a liquid state, and molten metal is delivered to the test piece under nitrogen pressure; the test piece adopts an impeller to drive electrically heated liquid metal to circularly flow in the test piece, the liquid metal is utilized to simulate in-reactor melt under a seriousaccident, heat is transmitted to a lower sealing head of the test piece, and the outer surface of the lower sealing head soaked in cooling water is boiled to realize heat exchange; the cooling waterrequired by the test is guaranteed by the cooling water supply loop and the steam cooling loop. According to the system and the method, the work of studying influence of the outside structure surfaceand a flow channel structure of the lower sealing head on external cooling performance of the pressure vessel can be carried out, thereby being beneficial to improvement ofsafety margin of external cooling of the pressure vessel.

Description

Technical field [0001] The invention belongs to the technical field of pressure vessel external cooling, and particularly relates to a pressure vessel external cooling test system and method. Specifically, it is a study on the boiling heat transfer performance of the outer surface of the hemisphere lower head of a large nuclear power reactor pressure vessel under severe accident conditions. Background technique [0002] In the event of a serious accident in a large nuclear power reactor, if the core is not sufficiently cooled, the decay heat generated by the core will continue to accumulate, and eventually the core will melt. The melted material will fall into the lower chamber of the pressure vessel under the action of gravity, and melt the structural parts in the lower chamber to form a molten pool. Cooling and keeping the melt in the reactor pressure vessel are key measures to mitigate the accident. In the event of a serious accident, injecting water into the reactor pit by p...

Claims

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Application Information

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IPC IPC(8): G21C17/00
CPCY02E30/30
Inventor 钟达文孟继安
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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