Recommended by Oleg Novoselsky 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.
|Autori:||MAZZANTINI O.; FERRERI J. C; D'AURIA F.; CAMUSSO C. P.|
|Titolo:||Natural Circulation in the ATUCHA-I PHWR Nuclear Power Plant|
|Anno del prodotto:||2007|
|Appare nelle tipologie:||1.1 Articolo in rivista|