The ball tank of the research reactor CIRUS is exposed to solar radiation. The ambient temperature undergoes seasonal and diurnal variation. The resulting thermal stress could be significant for the large structure. The temperature distribution has been obtained by the finite element method. The paper presents temperature distribution and the resulting thermal stress.

NISA finite element software, version 95, 1995, Engineering Mechanics Research Corporation, Michigan, USA.
Incopera, Frank P., 1985, Intoduction to Heat Transfer, Wiley and Sons, New York.
Perry, J. H., 1973, Chemical Engineering Handbook, 5th ed., McGraw Hill, New York, pp. 10, 11.
Radiation Atlas of India, Director General of Metrology, Government of India, India Meteorological Department, New Delhi, India.
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