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Title: Natural convection heat transfer within horizontal spent nuclear fuel assemblies

Natural convection heat transfer is experimentally investigated in an enclosed horizontal rod bundle, which characterizes a spent nuclear fuel assembly during dry storage and/or transport conditions. The basic test section consists of a square array of sixty-four stainless steel tubular heaters enclosed within a water-cooled rectangular copper heat exchanger. The heaters are supplied with a uniform power generation per unit length while the surrounding enclosure is maintained at a uniform temperature. The test section resides within a vacuum/pressure chamber in order to subject the assembly to a range of pressure statepoints and various backfill gases. The objective of this experimental study is to obtain convection correlations which can be used in order to easily incorporate convective effects into analytical models of horizontal spent fuel systems, and also to investigate the physical nature of natural convection in enclosed horizontal rod bundles in general. The resulting data consist of: (1) measured temperatures within the assembly as a function of power, pressure, and backfill gas; (2) the relative radiative contribution for the range of observed temperatures; (3) correlations of convective Nusselt number and Rayleigh number for the rod bundle as a whole; and (4) correlations of convective Nusselt number as a function ofmore » Rayleigh number for individual rods within the array.« less
Authors:
Publication Date:
OSTI Identifier:
573364
Report Number(s):
DOE/OR/00033--T746
ON: DE97053623; TRN: 98:008598
DOE Contract Number:
AC05-76OR00033
Resource Type:
Technical Report
Resource Relation:
Other Information: TH: Thesis (Ph.D.); PBD: Dec 1995
Research Org:
Texas Univ., Austin, TX (United States)
Sponsoring Org:
USDOE Office of Energy Research, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; NATURAL CONVECTION; SPENT FUEL ELEMENTS; DRY STORAGE; TRANSPORT; EXPERIMENTAL DATA; CORRELATIONS; TURBULENT FLOW