Session: 08-03: Computational Fluid Dynamics (CFD) and Applications - III

Paper Number: 134632

134632 - Scaled Experiment on Flow Characteristics of a Single Area of Spent Fuel Dry-Storage System of Htr-Pm1000 

Abstract: 

China is promoting the project of a 1000MW high-temperature gas-cooled reactor based on the technology of the pebble-bed module (HTR-PM1000). A 1000MW nuclear power plant is formed by ten modules in parallel, connected to a steam turbine. And each module has a thermal power of 250 MW and generates approximately 100 MW of power. The spent fuel dry-storage system of HTR-PM1000 is divided into six regions, with each region containing multiple storage silos. The spent fuel canisters are vertically placed in the storage silos, where air is forced or naturally circulated to remove decay heat. The flow resistance of air in the silos includes frictional pressure drop, local pressure drop, acceleration pressure drop, and gravitational pressure drop. Among them, the local pressure drop cannot be accurately obtained through theoretical calculation. In addition, the flow distribution characteristics of each silo are crucial for subsequent heat transfer calculations. Considering the cost of experiments and other factors, a 1/5 scaled experiment was conducted in this paper. The flow distribution and total resistance characteristics of different silos were recorded under the conditions of different fans and canisters loading. The flow characteristics experiment system of spent fuel dry-storage system mainly included 12 silos, a cold intake cabin, a hot air discharge cabin, an intake bend, and discharge piping. Furthermore, the main body of the silos adopted a modular design, divided into three modules with four silos in each group. In order to eliminate the influence of fan performance on the experiment, two fans were operated at full load separately, as well as the condition of two fans operating in parallel at full load. To find the worst case and study the influence of the number of canisters on flow distribution, experiments were conducted for three operating conditions: no load, full load, and half load. The results showed that the trend of silos flow variation was similar between no load and full load conditions. Starting from the intake side, the silos are numbered in sequence. The fifth silo had a larger flow and the flow of other positions fluctuated within a small range. Considering the inhomogeneity of flow velocity, the flow distribution of each silo became more uniform after correction of the flow in the fifth silo. The flow distribution was more even at full load, indicating that the local resistance between intake cabin and the downflow channel had small influence on the overall flow. Under the half load condition, the flow decreased with the increase of the number of storage canisters. The variation in flow within the second to fifth silos was small, and the ratio between the maximum and minimum flow was approximately 1.5:1. Additionally, based on the total resistance characteristics, the resistance coefficients under the no load and full load conditions were obtained, which matched well with the previously calculated values.

Presenting Author: Mengyao Wang Tsinghua university

Presenting Author Biography: The author studied at Harbin Engineering University with a focus on steam-liquid separation and published a paper “Review on the steam-liquid separation in the steam generator of nuclear power plants” in Annals of Nuclear Energy，and now is Pursuing a doctoral degree at Tsinghua University.

Authors:

Jinhua* Wang Tsinghua university
Mengyao Wang Tsinghua university
Menghang Gong Institute of Nuclear and New Energy Technology, Tsinghua University
Yue Li Tsinghua university
Bin Wu Tsinghua university
Wei Zhang Tsinghua university
Lihua Gao Tsinghua university
Tao Ma Tsinghua university
Haitao Wang Tsinghua university
Bing Liu Tsinghua university