The second NERVA engine, the NERVA XE, was designed to come as close as possible to a complete flight system, even to the point of using a flight-design turbopump.
第二台NERVA引擎——NERVA XE被设计用来尽可能的成为一个完整的飞行系统，甚至包括使用飞行测试涡轮泵。