| gptkbp:instanceOf | gptkb:nuclear_thermal_rocket_engine_program 
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                                | gptkbp:cancellationDate | 1973 
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                                | gptkbp:countryOfOrigin | gptkb:United_States 
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                                | gptkbp:developedBy | gptkb:Atomic_Energy_Commission gptkb:NASA
 1955-1973
 
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                                | gptkbp:engineType | nuclear thermal rocket 
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                                | gptkbp:fuelType | liquid hydrogen 
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                                | gptkbp:fullName | gptkb:Nuclear_Engine_for_Rocket_Vehicle_Application 
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                                | gptkbp:intendedUse | manned Mars missions upper stage for Saturn V
 
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                                | gptkbp:legacy | influenced later nuclear propulsion concepts 
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                                | gptkbp:locationOfArtifacts | gptkb:Smithsonian_National_Air_and_Space_Museum 
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                                | gptkbp:notableFor | gptkb:NRX-A6 gptkb:NRX-EST
 gptkb:XE_Prime
 
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                                | gptkbp:purpose | develop nuclear thermal rocket engines for space exploration 
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                                | gptkbp:reactorType | solid-core nuclear reactor 
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                                | gptkbp:relatedTo | gptkb:SNTP gptkb:Project_Rover
 
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                                | gptkbp:specificImpulseVacuum | up to 850 seconds 
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                                | gptkbp:status | cancelled 
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                                | gptkbp:testedBy | gptkb:Nevada_Test_Site 
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                                | gptkbp:thrust | up to 250,000 pounds-force 
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                                | gptkbp:bfsParent | gptkb:Nuclear_Engine_for_Rocket_Vehicle_Application gptkb:Project_Rover
 
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                                | gptkbp:bfsLayer | 7 
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                                | https://www.w3.org/2000/01/rdf-schema#label | NERVA 
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