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This report describes the EG&G LaboratoryDirected Research and Development Program (LDRD) Broad Application Test Reactor (BATR) Project that was conducted in fisca_ year 1991. The scope of this project was divided into three phases" a project process definitionphase, a requirementsdevelopmentphase, and a preconceptualreactor design and evaluation phase. Multidisciplinaryteams of experts conducted each phase. This report presents the need for a new test reactor, the project process definition, a set of current and projected regulatorycompliance and safety requirements,a set of facility user needs for a broad range of projected testing missions, and descriptionsof reactor concepts capable of meeting these requirements. This informationcan be applied to strategic planning to provide the Departmentof Energy with management options. q, w. 8 iii D-4 Rectangular Layout of 4 X 4 Modules. The Intermodule Separation is 2D, Twice the Outer Fuel Side Plate Diameter of a Module.

This report describes progress made at the Idaho National Engineering • Laboratoryduring the first three quarters of Fiscal Year (FY) 1992 on the Laboratory-Directed Research and Development (LDRD) project to perform " preliminarydesign studies on the Broad ApplicationTest Reactor (BATR). This work builds on the FY-92 BATR studies,"which identifiedanticipatedmission and safety requirementsfor BATR and assessed a variety of reactor concepts for their potential capabilityto meet those requirements. The main accomplishmentof the FY-92 BATR program is the development of baseline reactor configurationsfor the two conventionalconceptualtest reactors recommended in the FY-91 report. Much of the present report consists of descriptionsand neutronicsand thermohydraulicsanalyses of these baseline configurations. In addition,we consideredreactor safety issues, compared the consequencesof steam explosionsfor alternativeconventionalfuel types, explored a Molten Chloride Fast Reactor concept as an alternate BATR design, and examined strategies for the reduction of operating costs. Work planned for the last quarter of FY-92 is discussed, and recommendationsfor future work are also presented.

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