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Technical Brief

Thermal Hydraulic Analysis of China Spallation Neutron Source Target System Under Abnormal Situations

[+] Author and Article Information
Jun-Hong Hao

Key Laboratory for Thermal Science and
Power Engineering of Ministry of Education,
Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China

Qun Chen

Key Laboratory for Thermal Science and
Power Engineering of Ministry of Education,
Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
e-mail: chenqun@tsinghua.edu.cn

You-Lian Lu, Song-Lin Wang, Quan Ji, Tian-Jiao Liang

China Spallation Neutron Source,
Institute of High Energy Physics,
Chinese Academy of Sciences,
Dongguan 523803, China;
Dongguan Institute of Neutron Science (DINS),
Dongguan 523808, China

Quan-Zhi Yu

Beijing National Laboratory
for Condensed Matter Physics,
Institute of Physics,
Chinese Academy of Sciences,
Beijing 100190, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 20, 2015; final manuscript received August 30, 2016; published online September 27, 2016. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 139(1), 014504 (Sep 27, 2016) (6 pages) Paper No: HT-15-1742; doi: 10.1115/1.4034720 History: Received November 20, 2015; Revised August 30, 2016

The analysis of thermal hydraulic performance under three abnormal conditions is very important for the design of China spallation neutron source (CSNS) target system, which could provide some important information for developing an emergency plan. In this study, we first introduce the design of the CSNS target system and create a three-dimensional physical model, calculate the heat source and decay heat distribution using the MCNPX 2.5 Monte Carlo code and the CINDER’90 activation code, and simulate and analyze the temperature distribution in the tungsten target and the steel container under normal operation using fluent. By using the same model, the thermal hydraulic characteristics are analyzed under three different abnormal conditions including power failure, off-center of proton beam, and cooling water failure. The results show that in order to keep the cooling water temperature below the boil point at normal operating pressure, the emergency power for the cooling water should start immediately after power failure. The maximum temperature of the beam window and the up plate increases by about 8 °C when the offsetting distance of proton beam is 5 mm along z direction. The cooling water will not effectively take all away the heat when the flow rate of the cooling water drops below 72% of the normal setpoint.

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References

Figures

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Fig. 1

The structure of the CSNS target cooling system

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Fig. 2

Cross section (z = 0 mm) of the target cooling system

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Fig. 3

The schematic diagram of the tantalum clad target slice

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Fig. 4

Cross section (x = 0 mm) of the target cooling system

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Fig. 5

Temperature distribution in the centerline of the normal target system

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Fig. 6

The decay heat fitting curve with time

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Fig. 7

The maximum temperature of the cooling water after power failure

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