Study on air ingress of the 200 MWe pebble-bed modular high temperature gas-cooled reactor

Liu, Peng; Chen, Zhipeng; Zheng, Yongjun; Sun, Jun; Chen, Fubing; Shi, Lei; Fu, Li; Dong, Zhe; Zhang, Zuoyi

doi:10.1016/j.anucene.2016.07.029

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…When the mass flow rate of nitrogen injected is 1.5 kg/s or 2.0 kg/s, the onset time of natural circulation can be put off and the natural circulation mass flow rate is lower than that without nitrogen injected. is conclusion about the nitrogen injection is in accordance with the conclusion of Liu [12].…”

Section: Nitrogen and Helium Injectionsupporting

confidence: 87%

“…e Idaho National Laboratory [7] also proposed injecting helium to mitigate the consequence for the DEGB of the horizontal coaxial gas duct of GTHTR300 and verified the effectiveness of these mitigation measures by the CFD method. Liu [12] proposed injecting nitrogen from the fuel charging tube to prevent the establishment of natural circulation of the HTR-PM under DEGB of the horizontal coaxial gas duct accident. According to Liu's results, only when the flow rate of nitrogen injection reaches a certain value can the natural circulation be effectively prevented.…”

Section: Possible Mitigation Measuresmentioning

confidence: 99%

“…So CO 2 is not a good choice to alleviate the consequences for the HTR-PM. Zheng et al [11] and Liu [12] have done much work on the DEGB of the horizontal coaxial gas duct accident of the HTR-PM and discussed a lot about the diffusion process of this accident. e results of Zheng et al [11] showed that it costed dozens of hours to establish a stable natural circulation.…”

Section: Introductionmentioning

confidence: 99%

“…e results of Zheng et al [11] showed that it costed dozens of hours to establish a stable natural circulation. Liu [12] figured out that the air concentration in the cavity played an important role in the process of establishing the stable natural circulation and suggested injecting nitrogen with a large flow rate to alleviate the consequences. Xu et al [13,14] analyzed the oxidation results of this air ingress accident for the HTR-PM in detail and showed that the bottom reflector material with a higher oxidation rate is a better choice considering this air ingress accident.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Air Ingress Accident of the HTR-PM and Possible Mitigation Measures

Wang

Han

Xie

et al. 2020

Science and Technology of Nuclear Installations

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The double-ended guillotine break (DEGB) of the horizontal coaxial gas duct of a high-temperature gas-cooled reactor is an extremely hypothetical accident, which could cause the air to enter into the primary circuit and react with graphite in the reactor core. The performance of the HTR-PM plant under this extremely hypothetical accident has been studied by the system code TINTE in this work. The results show that the maximum fuel temperature will not reach the temperature design limitation, and the graphite oxidation will not cause unacceptable consequences even under some conservative assumptions. Moreover, nitrogen and helium injected from the fuel charging tube were studied as the possible mitigation measures to further alleviate the consequences of this air ingress accident. The preliminary results show that only the flow rate of nitrogen injected reaches a certain value, which can effectively alleviate the consequences, while for helium injection, both high and small flow rate can prevent or cut off the natural circulation and alleviate the consequences. The reason is that helium is much lighter than nitrogen, and the density difference between the coolant channel and the reactor core is small when helium is injected. Considering the injection velocity, the total usage amount, and the start time of gas injection, helium injected with a small flow rate is suggested.

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Section: Nitrogen and Helium Injectionsupporting

confidence: 87%

Section: Possible Mitigation Measuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Study of the Air Ingress Accident of the HTR-PM and Possible Mitigation Measures

Wang

Han

Xie

et al. 2020

Science and Technology of Nuclear Installations

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“…e TINTE (TIme-dependent Neutronics and TEmperatures) is a special-designed and well-developed code by the Research Center Jülich to evaluate the nuclear and thermal transient behavior of pebble-bed high-temperature gas-cooled reactors. e performance of TINTE has been validated by the well-known open/blind benchmarks [8][9][10][11] and has been widely used in the pebble-bed hightemperature reactor design [12][13][14], such as the HTR-PM in China and PBMR in South Africa. VSOP99 (also developed for pebble-bed high-temperature gas-cooled reactor by the Research Center Jülich) is used to prepare state parameters, e.g., the cross sections, the power, and burnup histories, for TINTE calculation.…”

Section: Tinte Codementioning

confidence: 99%

Transient Study on the HTR-PM with TINTE-vPower Coupling Code Package

Sun

Zheng

2020

Science and Technology of Nuclear Installations

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The high-temperature gas-cooled reactor pebble-bed module (HTR-PM) nuclear power plant consists of two nuclear steam supply system modules, each of which drives the steam turbine by the superheated steam flow and is fed by the heated-up water flow. The shared steam/water system induces mutual effects on normal operation conditions and transients of the nuclear power plant, which is worthy of safety concerns and intensive study. In this paper, a coupling code package was developed with the TINTE and vPower codes to understand how the HTR-PM operated. The TINTE code was used to analyze the reactor core and primary circuit, while the vPower code simulated the steam/water flow in the conventional island. Two TINTE models were built and coupled to one vPower model through the data exchange in the steam generator models. Using this code package, two typical transients were simulated by decreasing the primary flow rate or introducing the negative reactivity of one module. Important parameters, including the reactor power, the fuel temperature, and the reactor inlet and outlet helium temperatures of two modules, had been studied. The calculation results preliminarily proved that this code package can be further used to evaluate working performance of the HTR-PM.

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Research on the fuel loading patterns of the initial core in Chinese pebble-bed reactor HTR-PM

Zhang

Guo

et al. 2018

Annals of Nuclear Energy

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Study on air ingress of the 200 MWe pebble-bed modular high temperature gas-cooled reactor

Cited by 14 publications

References 13 publications

Numerical Study of the Air Ingress Accident of the HTR-PM and Possible Mitigation Measures

Numerical Study of the Air Ingress Accident of the HTR-PM and Possible Mitigation Measures

Transient Study on the HTR-PM with TINTE-vPower Coupling Code Package

Research on the fuel loading patterns of the initial core in Chinese pebble-bed reactor HTR-PM

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