Nuclear rocket research and development was initiated in the United States in 1955 and is still being pursued to a limited extent. The major technology emphasis occurred in the decade of the 1960's and was primarily associated with the Rover/NERVA Program where the technology for a nuclear rocket engine system for space application was developed and demonstrated. The NERVA (Nuclear Engine for Rocket Vehicle Application) technology developed twenty years ago provides a comprehensive and viable propulsion technology base that can be applied and will prove to be valuable for application to NASA's Space Exploration Initiative. Also the unique organization that evolved to successfully manage this effort requiring major contributions and involvement of two government agencies in partnership with industry is a useful model when a similar development is initiated for SEI. This paper, which is historical in scope, provides an overview of the conduct of the NERVA Engine Program, its organization and management, development philosophy, the engine configuration and significant accomplishments.

Aus Natriumdicyanimid und Aminhydrochloriden wurden substituierte Cyanguanidine und Biguanide hergestellt. Mit Aceton wurden einige Biguanide zu substituierten 4,6‐Diamino‐1,2‐dihydro‐1,3,5‐triazinen umgesetzt.

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