Investigation of the Thermal Performance of a Vertical Two-Phase Closed Thermosyphon as a Passive Cooling System for a Nuclear Reactor Spent Fuel Storage Pool

Abstract The decay heat that is produced by nuclear reactor spent fuel must be cooled in a spent fuel storage pool. A wickless heat pipe or a vertical two-phase closed thermosyphon (TPCT) is used to remove this decay heat. The objective of this research is to investigate the thermal performance of a prototype model for a large-scale vertical TPCT as a passive cooling system for a nuclear research reactor spent fuel storage pool. An experimental investigation and numerical simulation using RELAP5/MOD 3.2 were used to investigate the TPCT thermal performance. The effects of the initial pressure, filling ratio, and heat load were analyzed. Demineralized water was used as the TPCT working fluid. The cooled water was circulated in the water jacket as a cooling system. The experimental results show that the best thermal performance was obtained at a thermal resistance of 0.22°C/W, the lowest initial pressure, a filling ratio of 60%, and a high evaporator heat load. The simulation model that was experimentally validated showed a pattern and trend line similar to those of the experiment and can be used to predict the heat transfer phenomena of TPCT with varying inputs.

[1]  Saeed Zeinali Heris,et al.  HEAT TRANSFER ENHANCEMENT USING AL2O3/WATER NANOFLUID IN A TWO-PHASE CLOSED THERMOSYPHON , 2009 .

[2]  Nandy Putra,et al.  Thermal performance of screen mesh wick heat pipes with nanofluids , 2012 .

[3]  J. Weeks,et al.  Severe accidents in spent fuel pools in support of generic safety, Issue 82 , 1987 .

[4]  G. Su,et al.  Analysis of the loss of pool cooling accident in a PWR spent fuel pool with MAAP5 , 2014 .

[5]  B. Jäckel.  Status of the spent fuel in the reactor buildings of Fukushima Daiichi 1–4 , 2015 .

[6]  Yong Li,et al.  Evaporation and condensation heat transfer in a heat pipe with a sintered-grooved composite wick , 2013 .

[8]  Sung Jin Kim,et al.  Capillary performance of bi-porous sintered metal wicks , 2012 .

[9]  Zhichun Liu,et al.  Experimental study of the loop heat pipe with a flat disk-shaped evaporator , 2014 .

[10]  David Reay,et al.  Heat pipes : theory, design and applications , 2014 .

[11]  Nandy Putra,et al.  Thermal performance of biomaterial wick loop heat pipes with water-base Al2O3 nanofluids , 2014 .

[12]  Edward D. Throm.  Beyond design basis accidents in spent-fuel pools — Generic Issue 82 , 1991 .

[13]  Masoud Rahimi,et al.  CFD modeling of flow and heat transfer in a thermosyphon , 2010 .

[14]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[15]  Hanyang Gu,et al.  Experimental study on heat pipe heat removal capacity for passive cooling of spent fuel pool , 2015 .

[16]  Richard W. Johnson,et al.  Modeling strategies to compute natural circulation using CFD in a VHTR after a LOFA , 2014 .

[17]  Nandy Putra,et al.  Simulation of Heat Flux Effect in Straight Heat Pipe as Passive Residual Heat Removal System in Light Water Reactor Using RELAP5 Mod 3.2 , 2016 .

[18]  P. Anjankar,et al.  Experimental Analysis of Condenser Length Effect on the Performance of Thermosyphon , 2012 .

[19]  Zhengming Zhang,et al.  Investigation of a long term passive cooling system using two-phase thermosyphon loops for the nuclear reactor spent fuel pool , 2015 .

[20]  A. Abdel-azim.  Fundamentals of Heat and Mass Transfer , 2011 .

[21]  Z. Xiong,et al.  The design and simulation of a new spent fuel pool passive cooling system , 2013 .

[22]  A. Turan,et al.  Axi-symmetric simulation of a two phase vertical thermosyphon using Eulerian two-fluid methodology , 2013 .

[23]  V. Оgnerubov,et al.  Features of modelling of processes in spent fuel pools using various system codes , 2014 .

[24]  N. Putra,et al.  The Effect of CuO-Water Nanofluid and Biomaterial Wick on Loop Heat Pipe Performance , 2014 .

[25]  N. Putra,et al.  Effect of Concentration and Loading Fluid of Nanofluids on the Thermal Resistance of Sintered Powder Wick Heat Pipe , 2013 .

[26]  S. H. Noie.  Heat transfer characteristics of a two-phase closed thermosyphon , 2005 .