RELAP5-3D modelling of the HTTR-GT/H2 secondary system and turbomachinery

N. A. Anderson; P. W. Humrickhouse; C. Rabiti; H. Sato; X. L. Yan

doi:10.1016/j.nucengdes.2022.111697

RELAP5-3D modelling of the HTTR-GT/H₂ secondary system and turbomachinery

N. A. Anderson, P. W. Humrickhouse, C. Rabiti, H. Sato, X. L. Yan

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

High Temperature Gas-cooled Reactors (HTGRs) can be used for the cogeneration of electricity and hydrogen. The JAEA-operated High-Temperature engineering Test Reactor (HTTR-GT/H₂) is exploring using the reactor for electricity and hydrogen production. A RELAP5-3D model of the HTTR-GT/H₂ secondary system has been developed using design information. The various components and heat exchangers in the secondary system were investigated, modified, and improved where applicable. With these changes made, the model was run, and the results were compared to the design conditions. The results for the sole-power generation mode were shown to fit the design conditions very well. The largest temperature difference was on the order of 7 K, and the largest pressure difference was on the order of 0.05 MPa. The results for the hydrogen cogeneration mode did not fit the design conditions as well as the other case. The largest temperature difference was about 39 K and the largest pressure difference was about 0.27 MPa at the compressor outlet. The larger differences for the hydrogen cogeneration mode are attributed to the various complex components and the flow being split in the secondary loop. A transient reduction in heat removal capability of the secondary system was investigated. Reactor temperatures were predicted to rise as a result. The core reactivity response due to this increase in temperature is investigated and is expected to add negative reactivity to the reactor.

Original language	English
Article number	111697
Journal	Nuclear Engineering and Design
Volume	390
DOIs	https://doi.org/10.1016/j.nucengdes.2022.111697
State	Published - Apr 15 2022
Externally published	Yes

Funding

Prepared for the U.S. Department of Energy Office of Nuclear Energy Under DOE Idaho Operations Office Contract DE-AC07-05ID14517.

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10.1016/j.nucengdes.2022.111697

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title = "RELAP5-3D modelling of the HTTR-GT/H2 secondary system and turbomachinery",

abstract = "High Temperature Gas-cooled Reactors (HTGRs) can be used for the cogeneration of electricity and hydrogen. The JAEA-operated High-Temperature engineering Test Reactor (HTTR-GT/H2) is exploring using the reactor for electricity and hydrogen production. A RELAP5-3D model of the HTTR-GT/H2 secondary system has been developed using design information. The various components and heat exchangers in the secondary system were investigated, modified, and improved where applicable. With these changes made, the model was run, and the results were compared to the design conditions. The results for the sole-power generation mode were shown to fit the design conditions very well. The largest temperature difference was on the order of 7 K, and the largest pressure difference was on the order of 0.05 MPa. The results for the hydrogen cogeneration mode did not fit the design conditions as well as the other case. The largest temperature difference was about 39 K and the largest pressure difference was about 0.27 MPa at the compressor outlet. The larger differences for the hydrogen cogeneration mode are attributed to the various complex components and the flow being split in the secondary loop. A transient reduction in heat removal capability of the secondary system was investigated. Reactor temperatures were predicted to rise as a result. The core reactivity response due to this increase in temperature is investigated and is expected to add negative reactivity to the reactor.",

author = "Anderson, {N. A.} and Humrickhouse, {P. W.} and C. Rabiti and H. Sato and Yan, {X. L.}",

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doi = "10.1016/j.nucengdes.2022.111697",

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AU - Anderson, N. A.

AU - Humrickhouse, P. W.

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AU - Sato, H.

AU - Yan, X. L.

PY - 2022/4/15

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AB - High Temperature Gas-cooled Reactors (HTGRs) can be used for the cogeneration of electricity and hydrogen. The JAEA-operated High-Temperature engineering Test Reactor (HTTR-GT/H2) is exploring using the reactor for electricity and hydrogen production. A RELAP5-3D model of the HTTR-GT/H2 secondary system has been developed using design information. The various components and heat exchangers in the secondary system were investigated, modified, and improved where applicable. With these changes made, the model was run, and the results were compared to the design conditions. The results for the sole-power generation mode were shown to fit the design conditions very well. The largest temperature difference was on the order of 7 K, and the largest pressure difference was on the order of 0.05 MPa. The results for the hydrogen cogeneration mode did not fit the design conditions as well as the other case. The largest temperature difference was about 39 K and the largest pressure difference was about 0.27 MPa at the compressor outlet. The larger differences for the hydrogen cogeneration mode are attributed to the various complex components and the flow being split in the secondary loop. A transient reduction in heat removal capability of the secondary system was investigated. Reactor temperatures were predicted to rise as a result. The core reactivity response due to this increase in temperature is investigated and is expected to add negative reactivity to the reactor.

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RELAP5-3D modelling of the HTTR-GT/H₂ secondary system and turbomachinery

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