Preliminary Study on Mass Flow Rate in Passive Cooling Experimental Simulation During Transient Using NC-Queen Apparatus

Abstract

The research related to thermal management has been significantly inreased, especially for NPP safety. The use of passive cooling systems both during the accident and operation become reliable in the advanced reactor safety systems. Therefore it should be enhanced through experimental studies to investigate heat transfer phenomenon of the heat decay in transient cooling condition. An investigation has been performed through experiment using an NC-Queen apparatus constructed with rectangular loop. Piping were consisting of tubes of SS316L with diameter, length, and width of 3/4 inch, 2.7 m, and 0.5 m respectively. The height between heater and cooler was 1.4 m. The experiment used initial water temperature at 70 o C, 80 o C, and 90 o C in heater area. Transient temperature was used as experimental data to calculate water mass flow rate. The results showed that the temperature in heater area and cooler area were decreasing of about 90.6% and 95.7% at initial temperatur of 80 o C, and of about 71.1% and 59.4% at initial temperature of 70 o C. Those results were at higher initial temperature of 90 o C compared with the initial temperature of 90 o C. The average of water mass flow rate increased 81.03% from initial temperatur of 70 o C. It was shown that the averages of removed heat in every second from water due to heat loss and cooler, were 3.51 watts, 5.06 watts and 6.85 watts respectively. The initial condition of heat stored in the water was quite different, but to the cooler heat removal capacity and heat loss was almost the same.

Karakteristik Energi Internal Penukar Kalor Berdasarkan Variasi Temperatur Pemanas Sirkulasi Alam Untai Uji Fassip-02

“…Belajar dari pengalaman kecelakaan pembangkit listrik tenaga nuklir (PLTN) di Fukushima, Dai-ichi, Jepang tahun 2011 ketika sistem pendingin aktif (pompa) gagal dalam pendinginan reaktor, memicu studi terkait aplikasi sistem pendingin pasif (tanpa pompa) dalam peningkatan manajemen keselamatan PLTN [3], [10]. Kajian terkait laju aliran sirkulasi alam sebagai dasar dari sistem pendingin pasif telah dilakukan sejak tahun 2011 oleh Juarsa dkk [5]. Fasilitas eksperimen skala besar diberi nama untai uji Fasilitas Simulasi Sistem Pasif-02 (FASSIP-02) adalah salah satu fasilitas untuk mempelajari aliran sirkulasi alam akibat adanya gaya apung bouyancy dan gaya gravitasi [2], [9].…”

Estimation of natural circulation flow based on temperature in the FASSIP-02 large-scale test loop facility

“…The results showed that heat pipe has good cooling capability and can be proposed as passive cooling system in nuclear spent fuel storage pool [7,8]. In another investigation, as a preliminary research, previous research has been done using small test loop called NC-QUEEN for transient condition [9] we also have been constructed the FASSIP-01 loop research facility in order to investigate natural circulation flow based on the rectangular loop with medium size which is placed vertically. The HSS (heat sink system) loop used as cooling system to the cooler thank in the rectangular loop.…”

Simulation of Operational Conditions of Fassip-02 Natural Circulation Cooling System Experimental Loop

“…The researches by (10)(11)(12)(13)(14) are the study on done to study the generated natural flow (19). After that, a large scale verticalrectangular loop, so-called FASSIP-01, has been constructed and was used to study the stability of the natural circulation (20).…”