Thermal modeling of packages for normal conditions of transport with insolation
As part of the Safety Analysis Report for Packaging (SARP) for each special nuclear materials package, experimental tests or an analysis must be performed to determine the temperature distribution throughout the package when exposed to normal conditions of transport. These normal conditions include two cases - one with insolation and one without insolation. Insolation (total solar heat load) values to be used in the analyses are given in 10 CFR 71.71; however, the manner in which the insolation is to be applied is not specified. Several approaches can be taken: (1) perform a steady-state analysis assuming the insolation is applied continuously, (2) perform a transient analysis assuming the incident insolation is represented by a step function (i.e., insolation is applied and then not applied in 12-hour cycles), or (3) perform a transient analysis where the incident insolation is represented by a more complex function involving variables such as time of day. The purpose of this paper is to present these various approaches and examine the effect they have on package temperature distributions. The DC-1 shipping package with the Z88 can was used for the analyses to represent a typical thin-walled Celotex-based shipping package. The results of the study indicate that the method used in applying the insolation has a significant effect on the outermost portions of the package. Maximum outer container temperatures were found to vary by as much as 19.3{degree}C depending on which insolation method was used. Typically, internal package temperatures are more critical in this type of analysis. Since the total insolation over any 24-hour period is the same for all cases, internal package temperatures (secondary containment vessel, primary containment vessel, content, etc.) are relatively unaffected by the way in which the insolation is applied. Internal package temperatures vary no more than 2{degree}C for the three insolation methods investigated.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 205174
- Report Number(s):
- CONF-951135-28; ON: DE96005489; TRN: 96:008564
- Resource Relation:
- Conference: 1995 International mechanical engineering congress and exhibition, San Francisco, CA (United States), 12-17 Nov 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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