Published February 1991 | Version v1
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Thermal analysis of Boiling Water Capsule

  • 1. Japan Atomic Energy Research Inst., Oarai, Ibaraki (Japan). Oarai Research Establishment

Description

Thermal analysis was carried out in order to grasp thermal behavior of Boiling Water Capsule (BOCA). BOCA is a unit in the Irradiation Facility which is used for power ramp tests of the LWR fuel segments in the JMTR (Japan Material Testing Reactor). Heat transfer coefficients on each location of BOCA were estimated from the analysis. It was found that the coefficients was approximately 0.71 W/cm2K (1250 Btu/h ft2degF) at inner surface of capsule casing of BOCA, when linear heat rate of fuel segment was at 600 W/cm, and further that about 10 percent of heat generated in fuel segment pellet stack should be transported to upper regions over the pellet stack with injected water and cooled there. It is expected that obtained results will provide valuable informations for design of BOCA, irradiation technique of BOCA, design of other type capsule in which water is injected, and design of irradiation test device which deals with water. (author)

Availability note (English)

MF available from INIS under the Report Number.

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Publishing Information

Imprint Pagination
44 p.
Report number
JAERI-M--91-003