ANALYTICAL SOLUTION ON NATURAL CIRCULATION PHENOMENON IN COOLER TANK USSA FTS-02 BASED ON TEMPERATURE SETTING VARIATIONS
Shendy Akbar Maryadi (a,1), Dwi Yuliaji (a,c,2), Roy Waluyo (a,c,3), Ryan Oktaviandi (a,c), Katon Adhi Prayogo (a), Muhamad Repaldi (a), Muhammad Bintang (a), Syahrul Aminuddin (a), Randy Fahrian (a), Akbar Farhan Maulana (a), Muhamad Andika Apriansyah (a), Mulya Juarsa (a,b,4*)

(a) Mechanical Engineering Department, Faculty of Engineering and Sains, Ibn Khaldun Bogor University,
Jl. KH. Sholeh Iskandar KM.2, Kedungbadak, Kec. Tanah Sereal, Kota Bogor, Jawa Barat 16162, Indonesia
(1)akbarshendy[at]gmail.com
(2) dwi.yuliaji[at]uika-bogor.ac.id
(3) roy.waluyo[at]gmail.com

(b) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology, Research Organization for Nuclear Energy, National Research Agency (BRIN), Gd.80 Kawasan PUSPIPTEK Setu, Tangerang Selatan, Banten 15314, Indonesia
(4*) Corresponding author: mulya.juarsa[at]brin.go.id

(c) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281

Abstract

Research on the phenomenon of natural circulation is part of the passive safety system in nuclear reactors due to the nuclear power plant accident at Fukushima Daiichi caused by the failure of the active cooling system (the failure of pump). There is important to investigate the phenomenon of natural circulation to improve the performance of coolant management in passive safety systems. Then, an experimental facility for a passive cooling system was created called the USSA FTS-02 loop which is small in scale. The aim of this research was to understand the phenomenon of natural circulation through analytical solutions in the cooling tank section based on variations in water temperature. The research method was carried out by deriving the balance equation for the buoyancy and retarding forces that apply to the hot and cold arms on the USSA FTS-02 loop. Variation of temperature is determined in the cooling tank, namely 10oC, 15oC, and 20oC, and in the heating tank, namely at 70oC, 80oC and 90oC. The results of the analysis show that the temperature difference between the cooling and heating tank sections determines the natural circulation flow rate, where the greater the temperature difference, the greater the natural circulation flow rate.

Keywords: analytical, passive system, natural circulation, USSA FTS-02, cooling tank, temperature difference.

Topic: PHYSICAL SCIENCES