Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems | Zendy

S. P. Lakshmanan | Zendy; Manmohan Pandey | Zendy

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Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems

Author(s) -

S. P. Lakshmanan,

Manmohan Pandey

Publication year - 2010

Publication title -

science and technology of nuclear installations

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.417

H-Index - 24

eISSN - 1687-6083

pISSN - 1687-6075

DOI - 10.1155/2010/574195

Subject(s) - natural circulation , boiling , channel (broadcasting) , mechanics , flashing , flow (mathematics) , power (physics) , phase (matter) , circulation (fluid dynamics) , two phase flow , control theory (sociology) , environmental science , thermodynamics , materials science , engineering , computer science , physics , electrical engineering , artificial intelligence , control (management) , quantum mechanics , metallurgy

The behaviour of a parallel-channel natural circulation boiling water reactor under a low-pressure low-power startup condition has been studied numerically (using RELAP5) and compared with its scaled model. The parallel-channel RELAP5 model is an extension of a single-channel model developed and validated with experimental results. Existence of in-phase and out-of-phase flashing instabilities in the parallel-channel systems is investigated through simulations under equal and unequal power boundary conditions in the channels. The effect of flow resistance on Type-I oscillations is explored. For nonidentical condition in the channels, the flow fluctuations in the parallel-channel systems are found to be out-of-phase

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