The results and current status of an Aerojet sponsored program to develop a product line of low power radioisotope thermoelectric generators for marine applications are discussed. A 1-watt ( e) Undersea Radioisotope Power Supply (URIPS) has been designed, fabricated, and tested Extensive parametric studies were performed to select optimum design characteristics; typical parameters investigated were radioisotope and chemical fuel form, thermoelectric material, fuel capsule L/D ratio, shield material and geometry, and operating conditions . The design emphasizes high reliability and low cost, but considerable emphasis was placed on adaptability to meet a wide spectrum of user requirements . URIPS is designed to provide a steady power output for a minimum of five years at ocean depths up to 20 , 000 feet
