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The report contains the results of the Helium Circulator Auxiliary System Study performed as a part of the High Temperature Reactor Development Program. The major objectives of the study were to review and analyze the existing Fort St. Vrain (FSV) system (System 21) in an effort to identify and recommend modifications which would reduce system interactions, increase system stability, and improve the capability to mitigate system transients. The Helium Circulator Auxiliary System at FSV is comprised of several sub-systems which perform various functions to support the operation of the helium circulators. The primary functions of the system are to provide a source of clean, filtered water for lubrication of the circulator bearings and provide a dry, pressurized buffering gas to the circulator seals. The recommendations contained in this report are aimed at improving performance of the bearing water portion of the system. (ERA citation 08:002135)