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RISS 인기검색어
- 검색키워드
- 저자 : Fahmi Alfa Muslimu (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
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Theoretical Assessment of Control Element Assembly Drop Time During SCRAM of APR1400 Reactor
Fahmi Alfa Muslimu,Ihn NAMGUNG 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The reactor scram is a sudden shutdown of a nuclear reactor by rapid insertion of the Control Element Assembly (CEA) rods into the reactor core in order to stop the fission reaction. The CEA rods drop to the reactor core within the guide tubes by the gravity. For APR 1400, the CEA drop time is less than 4 seconds to meet the reactor physical requirement of emergency reactor shut-down condition in order to prevent run-away fission reaction in the core. The aim of this study is to investigate theoretical minimum mass for the control rod that can make it fully inserted into the guide tube within the required time without failure. The control rod drop time computed using simulation and compared with available data from operational results of APR1400. The 2D axisymmetric model was constructed to simulate the drop motion using dynamic mesh layering technique in Computational Fluid Dynamic (CFD) ANSYS Fluent 19.1. Design parameter such as control rod geometry, guide tube geometry, operating pressure, and core average velocity was adopted from APR1400 and used for simulation. The simulation has shown that when the control rod mass is less than 10.32 kg under the same design geometry it cannot be fully inserted to the guide tube. The 12 finger full strength has been established to drop slower than 4 finger full strength and 4 finger part strength.
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