Operation Julin was a series of 8 underground nuclear tests conducted at the Nevada Test Site

Nevada Test Site

The Nevada National Security Site , previously the Nevada Test Site , is a United States Department of Energy reservation located in southeastern Nye County, Nevada, about northwest of the city of Las Vegas...

 in 1991 and 1992. This test series followed the Sculpin

Operation Sculpin

Operation Sculpin was a series of 8 nuclear tests conducted at the Nevada Test Site in 1990 and 1991. These tests followed the Aqueduct series and preceded Julin...

 series and was the last nuclear test series conducted by the U.S. The individual blasts were:

Name	Date	Yield	Notes
LUBBOCK	October 18, 1991	20 to 150 kilotons
BRISTOL Julin Bristol Julin Bristol was the last British nuclear test, and took place at the Nevada Test Site on 26 November 1991. With a yield of less than 20 kilotons it may have been a proof test of some aspect of the British-designed warheads fitted to those Trident missiles in the British arsenal, possibly of a...	November 26, 1991	< 20 kilotons	Last British test
JUNCTION	March 26, 1992	20 to 150 kilotons
DIAMOND FORTUNE	April 30, 1992	< 20 kilotons
VICTORIA	June 19, 1992	< 20 kilotons
GALENA-YELLOW	June 23, 1992	low	Simultaneous, same hole
GALENA-ORANGE		low
GALENA-GREEN		low
HUNTERS TROPHY	September 18, 1992	< 20 kilotons
DIVIDER	September 23, 1992	< 20 kilotons	Last U.S. nuclear test

Last test

As the series was the last conducted by the U.S., the last test in the series also became the last nuclear test conducted by the U.S. It was named "Divider" and took place on September 23, 1992. It was described as a "Test to ensure the safety of U.S. deterrent forces". U.S. President George Bush Sr. declared a testing moratorium October 1st 1992.