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startup 2

closed Brayton cycle 1

commissioning 1

gas-cooled space nuclear reactor power 1

hybrid system 1

in-hospital neutron irradiator(INHI) 1

part-load strategy 1

positive reactivity insertion accident 1

shutdown 1

solid oxide fuel cell (SOFC) 1

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Part-load, startup, and shutdown strategies of a solid oxide fuel cell-gas turbine hybrid system

Yang LI, Yiwu WENG, Shilie WENG

Frontiers in Energy 2011, Volume 5, Issue 2, Pages 181-194 doi: 10.1007/s11708-011-0149-7

Abstract: Another major objective of this paper is to introduce a suitable startup and shutdown strategy for theThe sequences for the startup and shutdown are proposed in detail, and the system responses are acquiredHydrogen is used instead of methane during the startup and shutdown process.

Keywords： solid oxide fuel cell (SOFC) hybrid system part-load strategy startup shutdown

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Dynamic simulation of a space gas-cooled reactor power system with a closed Brayton cycle

Frontiers in Energy 2021, Volume 15, Issue 4, Pages 916-929 doi: 10.1007/s11708-021-0757-9

Abstract: Space nuclear reactor power (SNRP) using a gas-cooled reactor (GCR) and a closed Brayton cycle (CBC) is the ideal choice for future high-power space missions. To investigate the safety characteristics and develop the control strategies for gas-cooled SNRP, transient models for GCR, energy conversion unit, pipes, heat exchangers, pump and heat pipe radiator are established and a system analysis code is developed in this paper. Then, analyses of several operation conditions are performed using this code. In full-power steady-state operation, the core hot spot of 1293 K occurs near the upper part of the core. If 0.4 $ reactivity is introduced into the core, the maximum temperature that the fuel can reach is 2059 K, which is 914 K lower than the fuel melting point. The system finally has the ability to achieve a new steady-state with a higher reactor power. When the GCR is shut down in an emergency, the residual heat of the reactor can be removed through the conduction of the core and radiation heat transfer. The results indicate that the designed GCR is inherently safe owing to its negative reactivity feedback and passive decay heat removal. This paper may provide valuable references for safety design and analysis of the gas-cooled SNRP coupled with CBC.

Keywords： gas-cooled space nuclear reactor power closed Brayton cycle system startup and shutdown positive reactivity

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Construction of in-hospital neutron irradiator

Li Yiguo,Xia Pu,Peng Dan,Zou Shuyun,Wu Xiaobo,Zhang Jinhua,Zhang Yongbao,Zhang Zizhu,Liu Tong,Zhou Yongmao

Strategic Study of CAE 2012, Volume 14, Issue 8, Pages 17-19

Abstract:

The construction of in-hospital neutron irradiator (IHNI) started in 2007. Its building construction was completed in Dec. 2008, and the installation and test of the relevant systems were completed in Mar. 2009. The first criticality was achieved on Dec. 7, 2010. The reactor reached the full power on Jan. 22, 2010. The test results show that the final excess reactivity is 4.2 mk; the maximum continuous operation time at full power is 12 h and the power wave is less then 0.3 % during full power operation; when the positive reactivity with 4.2 mk is inserted into the reactor suddenly, the power will be increased to 85.7 kW at the time of 229 s, and then, it will turn to the normal value due to the negative temperature effect.The release result of reactivity shows the inherent safety of reactor.

Keywords： in-hospital neutron irradiator(INHI) commissioning startup