Conversation so far:
Did Mike Gravel have a problem with the Nuclear bomb ?
The Milrow test would be a one-megaton calibration exercise for the second and larger five-megaton Cannikin test, which would measure the warhead's effectiveness. Mike Gravel opposed the tests.
What were Mike Gravel's reasons for opposing the Milrow test?
Before the 1969 Milrow test, Mike Gravel wrote that there were significant risks of earthquakes and other adverse consequences, calling for an independent national commission on nuclear and seismic safety.
Did Mike Gravel have problem with the Cold War ?
Before U.S. Secretary of State Henry Kissinger's July 1971 secret mission to the People's Republic of China (P.R.C.), Mike Gravel introduced legislation to recognize and normalize relations with China.
Did the US Senate pass the bill to recognize the People's Republic of China ?
On January 1, 1979, the United States recognized the PRC and established diplomatic relations with it as the sole legitimate government of China.
What else did Mike Gravel do to stop the nuclear power?
In 1971 Mike Gravel sponsored a bill to impose a moratorium on nuclear power plant construction and to make power utilities liable for any nuclear accidents.

Question: What did they do ?
Self-contained rewrite: What did Mike Gravel do in regards to the bills imposing a moratorium on nuclear power plant construction?