STUDY DESIGN OF LIQUID METAL Pb-Bi COOLED FAST REACTORS AND CAPABILITY OF NATURAL CIRCULATION

• Main Author: OKTAMULIANI (NIM : 20212038); Pembimbing : Prof. Dr. Eng. Zaki Su'ud, SRI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19497
• Institution: Institut Teknologi Bandung

A preliminary study designs Small Power Reactor, Indonesia, No On-Site Refueling (SPINNOR) liquid metal Pb-Bi cooled fast reactors, fuel (U, Pu)N, 150 MWth have been performed. Neutronic calculation uses SRAC which is designed cylindrical core 2D (R-Z) 90 x 135 cm, on the core fuel composed of heterogeneous with percentage difference of PuN 10, 12, 13% and the results of calculation are effective neutron multiplication 1.0488 and power density average is 147.44 watts/cc. Power density distribution of the output SRAC is generated for thermal hydraulic calculation using Delphi based on Pascal language that have been developed. The research designed a reactor that is capable of natural circulation at inlet temperatur 300 °C with variation of total mass flow rate. Total mass flow rate affect pressure drop and temperatur outlet of the reactor core. The greater the total mass flow rate cause the smaller the outlet temperatur, but increase the pressure drop so that the chimney needed more higher to achieve natural circulation or condition of the system does not require a pump. Optimization of the total mass flow rate produces optimal reactor design on the total mass flow rate of 5000 kg/s with outlet temperatur 524,843 oC but require a chimney of 6,69 meters. Analysis of power varation toward high of chimney to achieve the capability of natural circulation shows that the higher the power, the lower the high chimney needed to achieve the capability of natural circulation Pb-Bi cooled. Natural circulation capability of reactor 200 MWth and 250 MWth at mass flow 5000 kg/s are achieved at 4.84 m and 3.72 chimney.