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RESEARCH PAPERS

The Possibility of Multiple Temperature Maxima in Geologic Repositories for Spent Fuel From Nuclear Reactors

[+] Author and Article Information
S. W. Beyerlein, H. C. Claiborne

Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tenn. 37830

J. Heat Transfer 104(1), 180-184 (Feb 01, 1982) (5 pages) doi:10.1115/1.3245047 History: Received July 27, 1981; Online October 20, 2009

Abstract

Heat transfer studies for CANDU spent fuel repositories showed that two temperature maxima at the source could occur: one at ∼60 and another one at ∼13,000 yrs. Spent fuel from pressurized water reactors (PWRs) did not exhibit this phenomenon. Because CANDU spent fuels display a monotonically decreasing heat generation rate, it is not immediately obvious why such behavior occurs. This paper demonstrates that the “double-peak” phenomenon is due to the presence of the right mixture of short and long-lived nuclides in the fuel and that the second peak does not occur for repository sizes less than ∼1 km2 . For larger repositories, radial and surface heat transfer reduces the magnitude of the second peak.

Copyright © 1982 by ASME
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