Simulation and mockup tests for developing TRR-II CNS

• Published in: Physica. B, Condensed matter Condensed matter, 2002, Vol.311 (1), p.173-181
• Main Authors: Lee, C.H., Kawai, T., Chan, Y.K., Hong, W.T., Lee, D.J., Guung, T.C., Lan, K.C.
• Format: Article
• Language: English
• Subjects: Applied sciences; Cold neutron source; Condensed matter: structure, mechanical and thermal properties; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fusion reactors; Installations for energy generation and conversion: thermal and electrical energy; Neutron diffraction and scattering; Physics; Simulation; Structure of solids and liquids; crystallography
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(01)01134-6

The Taiwan Research Reactor improvement and the utilization promotion project (TRR-II) with Cold Neutron Source (CNS) was carried out at Institute of Nuclear Energy Research. The CNS with a two-phase thermosiphon loop consists of an annular cylindrical moderator cell, a single moderator transfer tube, and a condenser. The self-regulating characteristics of a two-phase thermosiphon loop are investigated against variations of heat load. The experiments on the thermal-hydraulic characteristics have been performed using a full-scale mockup loop and a Freon-11 was used as a working fluid. Two cases were evaluated by the simulation and experiments. One case is an ORPHEE-type moderator cell in which an inner shell is open at the bottom, the other case is one with an inner cavity with no hole at the bottom but a vapor inlet opening at the uppermost part of the cavity. The flooding limitations, liquid level and void fraction in the moderator cell as a function of the initial Freon-11 inventory and the heat load are also reported.