EPJ Nuclear Sci. Technol.
Volume 8, 2022
Euratom Research and Training in 2022: the Awards collection
|Number of page(s)
|Part 1: Safety research and training of reactor systems
|25 November 2022
Start-up, operation and thermal-hydraulic analysis of a self-propelling supercritical CO2 heat removal system coupled to a pressurized water reactor
University of Stuttgart Institute of Nuclear Technology and Energy Systems (IKE), Pfaffenwaldring 31, 70569 Stuttgart, Germany
2 Simulator Centre of KSG | GfS, Essen, Germany
3 University of Stuttgart, Stuttgart, Germany
* e-mail: firstname.lastname@example.org
Received in final form: 21 September 2022
Accepted: 14 October 2022
Published online: 25 November 2022
The supercritical carbon dioxide (sCO21) heat removal system, which is based on a closed Brayton cycle with sCO2 as a working fluid, is an innovative, self-propelling and modular heat removal system for existing and future nuclear power plants. By changing the number of CO2 cycles, the heat removal capacity can be adapted. In this paper, up to four sCO2 cycles are analyzed in interaction with a pressurized water reactor, using the thermal-hydraulic system code ATHLET and considering a long-term station blackout and loss of ultimate heat sink scenario with conservatively high and low decay heat curves. The presented start-up procedure for the heat removal system might require further optimization due to the non-linear thermal gradients. Independent from the start-up, a heat removal system with three or four CO2 cycles keeps the primary loop temperatures sufficiently low. However, with only three cycles, the core is almost uncovered, and the danger of recriticality may occur due to cold leg deboration. Controlling the turbine inlet temperature via the turbomachinery speed and subsequent shutdown of single cycles successfully adapts the operation of the heat removal system to the declining decay heat. This enables reliable decay heat removal for more than 72 h.
© M. Hofer et al., Published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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