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Metallurgical Reactions Involving Ag-ln-Cd Control Rod Assemblies

Yung Y. Liu, Lawrence A. Neimark, W. D. Jackson

Nuclear Technology / Volume 87 / Number 1 / Pages 95-103

August 1989

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Three pieces of control rod and Zircaloy guide tube from the Three Mile Island Unit 2 reactor have been examined at Argonne National Laboratory. Microstructure and microchemistry of the materials have been characterized as a function of their elevations from the core bottom. Within a short distance between the 47- and 52-cm elevations, the microstructure varied from molten Ag-ln-Cd without stainless steel cladding to candling and cladding/Zircaloy metallurgical reactions, to an intact control rod in its Zircaloy guide tube that had transformed into a beta-phase structure. These microstructures provided semiquantitative markers of the temperatures experienced during the accident at this location.

 
 
 
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