英文文献汇报

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Hello everyone, nice to see all of you . It’s my turn to give the presentation.

The topic of mine is “Preliminary Thermal-hydraulic Design and Analysis of China Lead Alloy Cooled Research Reactor (CLEAR-I)”. Author’s names are writing on the middle of this slide, you can see. And my name is Ash. This paper is in the area of nuclear physics. I hope you will enjoy it, let’s begin.

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Let’s see the background first. Nuclear power is an attractive way to solve the energy dilemma. There are so many pressurized water reactors (PWR) have been built. So much nuclear waste have been produced every year. We need a system to do with nuclear waste.The accelerator driven system (ADS) is a potential option of a transmutation system in terms of the partitioning and transmutation strategies for the radioactive waste in the advanced nuclear fuel cycle. What’s more, a natural circulation cooled reactor thermal-hydraulic calculation model had been built up by I Time: 30 seconds(1:20~1:50)

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Let’s see the feature of CLEAR-I.PWR’s coolant is water. Different from PWR,CLEAR-I use lead-bismuth as coolant. lead-bismuth has high heat transfer coefficient and large heat capacity. CLEAR-I is a research reactor, which is not intersecting in power generation or high neutron flux. So it’s power only have https://www.360docs.net/doc/6b2667965.html,ing natural circulation, the system is more safety.

Time: 30 seconds(1:50~2:10)

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This is the structure of our CLEAR-I reactor. CLEAR-I is a pool-type reactor using a cylindrical heat barrier to divide the PbBi pool into a hot pool and a cold pool. The primary coolant is driven by natural circulation. So, we do not need pumps.

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The model is complex. We use Boussinesq approximation to simplify models and assumes that the riser and down comer are adiabatic. Though simplifying models, we can simplify iteration Using impulse equation and energy equation describe the problem.

nstitute of Nuclear Energy Safety Technology.

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The impulse equation, the pressure losses and the energy equation can be described as this. Time: 30 seconds(2:50~3:20)

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As a research reactor, the design constraints are focus on safety and experiment utility value. Three main limit values include maximum fuel temperature limit, maximum cladding temperature limit and maximum coolant velocity limit were chosen as CLEAR-I design constrains. This table show the specific values of each constrain.

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Let’s see the table 2 an table 3. A summary of core geometry parameters are presented in Table 2.

The steady state thermal-hydraulic parameters of CLEAR-I are shown in Table 3.To increase natural circulation ability, the increase in circulation height or decrease circulation pressure drop was required. Large diameter pins are used in CLEAR-I to achieve large fuel volume fraction. Time: 70 seconds (4:00~5:10)

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As a natural circulation reactor, main parameters like coolant channel geometry parameters and circulation height will influent the circulation performance directly. The coolant channel parameters will directly influent the core pressure loss and fuel volume fraction.From Fig 1 and Fig 2,we can find that the core pressure loss is reduced while the fuel volume fraction is increase as the pin diameter increase.According to these results, we can use large diameters pins in a natural circulation reactor to achieve low pressure loss and height fuel volume friction.

Time: 60 seconds (5:10~6:10)

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The circulation height of a natural circulation reactor is the thermal central height differences of PHX and core. From Fig.5, we can find that the maximum cladding temperature reduce as the circulation height increase. From Fig.6, we can find that the PbBi inventory increase as the circulation height increase. So, increase circulation height can increase natural circulation ability while require more PbBi inventory in the reactor vessel.

Time: 70 seconds (6:10~7:20)

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From the analysis, we can get that the maximum cladding temperature (445℃), the maximum fuel temperature (564℃), the maximum coolant velocity (0.21m/s) are all below design constrains. These results show that the preliminary thermal-hydraulic design of CLEAR-I is feasible and acceptable.

In the future, we have a lot of work to do. Optimize design of coolant channel parameter and circulation height will be carried out to improve the natural circulation performance and economy performance of CLEAR-I. And core flow distribution and transient analysis of primary coolant system will be investigated in the future.