“…A new reactor, while planned for multiple purposes, would specifically meet the long-term needs of the Naval Reactors program, with many of its test loops reserved for Navy work. 121 Phillips prepared the conceptual design, combining its MTR and ETR operating experience with ideas from physicists at laboratories all over the country. One of the "advanced" features of the ATR was its ability to test several samples in the reactor at the same time, but exposing each one to different absolute flux levels.…”