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Nuclear Safety Design and Innovation

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Front. Energy Res. | doi: 10.3389/fenrg.2018.00127

Startup Thermal Analysis of a Supercritical-Pressure Light Water-Cooled Reactor CSR1000

 Yuan Yuan1, 2*, Jianqiang Shan3, Li Wang2, Dongqing Wang2 and  Xiaoying Zhang2
  • 1Sun Yat-sen University, China
  • 2Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, China
  • 3Xi'an Jiaotong University, China

Supercritical-pressure light water-cooled reactors (SCWR) are the only water cooled reactor types in Generation IV nuclear energy systems. Startup systems, and their associated startup characteristic analyses, are important components of the SCWR design. To analyze the entire startup system, we propose a wall heat transfer model in a paper, based on the results from a supercritical transient analysis code named SCTRAN developed by Xi’an Jiao tong Tong University. In this work, we propose a new heat transfer mode selection process. Additionally, the most appropriate heat transfer coefficient selection method is chosen from existing state-of-the-art methods. Within the model development section of the work, we solve the problem of discontinuous heat transfer coefficients in the logic transformation step. When the pressure is greater than 19 Mpa, a look-up table method is used to obtain the heat transfer coefficients with the best prediction accuracy across the critical region. Then, we describe a control strategy for the startup process that includes a description of the control objects for coolant flow rate, heat-exchange outlet temperature, system pressure, core thermal power, steam drum water-level and the once-through direct cycle loop inlet temperature. Different control schemes are set-up according to different control objectives of the startup phases. Based on CSR1000 reactor, an analytical model, which includes a circulation loop and once-through direct cycle loop is established, and four startup processes, with control systems, are proposed. The calculation results show that the thermal parameters of the circulation loop and the once-through direct cycle meets all expectations. The maximum cladding surface temperature remains below the limit temperature of 650℃. The feasibility of the startup scheme and the security of the startup process are verified.

Keywords: Supercritical water reactor, SCTRAN, Heat transfer coefficients, heat transfer, control system, Startup

Received: 08 Sep 2018; Accepted: 07 Nov 2018.

Edited by:

Jun Wang, University of Wisconsin-Madison, United States

Reviewed by:

Claudio Tenreiro, University of Talca, Chile
Yacine Addad, Khalifa University, United Arab Emirates
Hui Cheng, City University of Hong Kong, Hong Kong  

Copyright: © 2018 Yuan, Shan, Wang, Wang and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Yuan Yuan, Sun Yat-sen University, Guangzhou, China, yuanyuan5@mail.sysu.edu.cn