Natural Circulation in the ATUCHA-I PHWR Nuclear Power Plant | Zendy

O. Mazzantini | Zendy; J. C. Ferreri | Zendy; F. D’Auria | Zendy; C. P. Camusso | Zendy

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Natural Circulation in the ATUCHA-I PHWR Nuclear Power Plant

Author(s) -

O. Mazzantini,

J. C. Ferreri,

F. D’Auria,

C. P. Camusso

Publication year - 2007

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 - 10.1155/2007/41641

Subject(s) - natural circulation , nuclear engineering , nuclear power plant , residual , nuclear reactor core , environmental science , pressurized water reactor , flow (mathematics) , power station , pressurizer , nuclear reactor , nuclear power , mechanics , engineering , nuclear physics , coolant , mechanical engineering , mathematics , physics , electrical engineering , algorithm

A systematic study of natural circulation (NC) in a postulated, varying primary mass inventory scenario at residual power fractions has been performed for a nuclear power plant operating in Argentina. It is a pressurized heavy water reactor, cooled and moderated by heavy water. The analysis seems particularly relevant at present, because a second nuclear power plant (NPP), of similar design and nearly 745 MWe, is now under finalization. NRC-RELAP5/MOD3.3 was the code used to perform the simulations. Results obtained are presented in the form of natural circulation flow maps. The trends obtained fit in the expected limits for integral test facilities representative of PWRs. In addition, the validity of a simplified analysis to scale single and two-phase core flow has been verified. A set of constants has been obtained, which permits predicting NC core mass flow rate (CMFR) for this NPP. Results are partially validated, for single-phase NC flow, using a documented plant transient, showing reasonable agreement. Also, the effect of pressurizer size on the predicted evolution curve in the NC flow map (NCFM) is discussed.

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