Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Enhancement of critical heat flux with additive-manufactured heat-transfer surface

  • Tatsuya Kano (Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University) ;
  • Rintaro Ono (Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University) ;
  • Masahiro Furuya (Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University)
  • Received : 2023.10.24
  • Accepted : 2024.02.03
  • Published : 2024.07.25
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Abstract

In-Vessel Retention (IVR) is a key technology to retain the molten core in the reactor vessel during severe accidents of Pressurized-water reactors (PWRs). In order to gain the safety margin of IVR, it is crucial to enhance the critical heat flux (CHF) of the reactor vessel, which is submerged in a water pool. To enhance the CHF, we have designed and additive-manufactured porous grid plates with a 3-D printer for design flexibility. We measured the CHF for the porous grid plate on the boiling heat transfer surface and found that the CHF was enhanced by 50 % more than that of the bare surface. The CHF enhanced more with a narrower grid pitch and a lower grid height. The visual observation study revealed that the vapor film was formed at the bottom of the grid plate.

Keywords

Acknowledgement

This work was supported by JSPS KAKENHI Grant Number JP21421713.

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