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The analysis preceding and supporting the design of the cooling system of the ML-1, a mobile, low-power, nuclear power plant, is described in sufficient detail for an engineer to follow the development of the design. Test results and similar data are used to support the calculations whenever possible.
The analysis preceding and supporting the design of the ML-1--a mobile, low-power, nuclear power plant--is described in sufficient detail for an engineer, not a specialist, to follow the development of the design. Test results and similar data are used to support the calculations whenever possible. Useless repetition of detail is avoided: when the development of several items of equipment, performing a similar function under similar conditions, is described the calculations and derivations are given only once.
The improved ML-1 precooler was designed and fabricated by Stewart-Warner Corporation to specifications prepared by AGN. These specifications incorporated provisions to correct the deficiencies that existed in the original ML-1 precooler design and to permit the evaluation of a unit suitable for inclusion in the ML-1A plant. The improved ML-1 precooler core is an aluminum plate and fin, single pass, cross flow heat exchanger designed to be capable of cooling 27.0 lb/sec of nitrogen gas from 500 to 125/sup 0/F, with 100/sup 0/F ambient air (under forced convection) as the cooling medium. The unit was delivered to AGN in March 1965. The improved air-side cooling assembly for the precooler was designed and fabricated at AGN, San Ramon, to correct the deficiencies in cooling air mass flow and distribution that existed in the original ML-1 precooler design. The improved cooling assembly consists of six 36-in. diameter, 1800/900 rpm fans mounted in a box-type aluminum support structure together with the associated plenum assemblies.
A supplement to the ML-1 Hazards Summary Report, No. IDO-28560, originally published in November 1960, is presented. The material in the Supplement amplifies and revises various sections of the original publication, in order to up-date it and to satisfy the requirements pertinent to power operation of the entire ML-1 plant. The text, with illustrations and graphs, is arranged in five sections and two appendixes: (1) a summary that includes an up-todate tabulation of power plant characteristics; (2) descriptions of significant changes to certain ML-1 componentsfuel element, leak-detection and refueling equipment, stainless steel uses, control blade locking mechanisms, and moderator deoxygenation; (3) operation of the plant with air as the coolant; (4) the Phase II Test Program under which the combined reactor and power-conversion packages will be operated; and (5) examples of detailed operating procedures for the test program. The appendixes contnin: (1) discussions of recommendations made by the U.S. AEC concerning ML-1 operations, and (2) a list of errata in the original report. (auth).