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The results of a round robin on the closed-end burst testing of Zircaloy tubes for fuel cladding are presented. Sponsored by the American Society for Testing and Materials, the testing program had as its objective the preparation of a suitable burst test procedure for inclusion in the ASTM Specification for Wrought Zirconium and Zirconium Alloy Seamless and Welded Tubes for Nuclear Service (B 353-71).
Seventy-five specimens, cut from five lengths of tubing were tested at room temperature. Four laboratories took part and six different test methods were used.
It was found that the closed-end burst test can be used to characterize the biaxial mechanical properties of Zircaloy cladding tubes. The tests identified certain parameters as having a significant effect on the mechanical properties and which must be precisely defined in the specification, these include the internal mandrel geometry, strain rate, and system stored energy. The most desirable burst test apparatus is one which has low stored energy and which provides good control over the volume pumping rate producing a smooth pressure versus fluid volume output curve.
zirconium, irradiation, zirconium alloys, tubes, burst tests, mechanical properties
Group leader, Fuel and Cladding Performance Group, Atomic Energy of Canada Limited, Chalk River Nuclear Labs., Chalk River, Ontario
Managerresident engineer, Combustion Engineering Inc.KWU, WindsorErlangen, Conn.
Materials engineer, Babcock and Wilcox Co., Lynchburg, Va.