The Large Leak Test Rig (LLTR) and its role in providing information on the consequences of large sodium-water reactions in sodium-heated steam generators is described. Facility startup problems and subsequent operating experiences are discussed. Instrumentation and data acquisition methods are identified and typical data from initial tests using the 30-MWt Modular Steam Generator (hockey-stick steam generator) as a test article are presented. Information also is included on post-test inspection methods, equipment, and results. Facility modifications to permit testing of steam generator geometries, systems, and equipment more nearly prototypic of those for large LMFBR’s are described.

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