No one knows the upper engineering limit of success - because no one has tried and failed to exceed it. 1 What is the largest purely fission type nuclear warhead that you could build I was reading about nuclear devices and I was under the impression that that there is a theoretical upper limit to the size of a pure fission device. To work, the stage must compress the layer above it to fusion temperature and density and hold it there long enough to create yield. As the radius of the sphere increases, the volume involved cubes. Plutonium is created when an atom of uranium. The bomb basically explodes in a spherical fashion. The worlds first nuclear explosion was achieved with plutonium, a man-made element produced in nuclear reactors. It was the third of 29 nuclear tests conducted at the. JThe United States conducts Shot Priscilla on June 24, 1957. a 74 kiloton fission bomb and the largest atmospheric test ever at the Nevada Test Site. It is unknown how many teritary stages can be chained together. 1944 May Edward Teller is removed as head of the implosion theory group, and also from fission weapon research entirely. The Tsar Bomba was speculated to have had multiple tertiary stages. Speculating about thermonuclear weapons is really all we can doīecause real knowledge remains closely controlled. The Tsar Bomba actually sent most of its energy into space, and not along the surface - which is what you want a bomb to do - so BIGGER yield may not in fact scale to bigger damage. You can get better results, more reliability, and greater fault tolerance delivering more, smaller bombs. No one has dared test a larger design - but much like huge draglines and dumptrucks, no one WANTS to push the design to the upper limits. Analysis of the radioactive fallout from this bomb revealed it to be a fission-fusion-fission weapon, a hydrogen bomb with an outer sheath of natural uranium. It demonstrated a yield of 500 kt in the Ivy King test at Eniwetok (15 November 1952. The largest pure fission bomb ever tested was the Mk 18F Super Oralloy Bomb (SOB) designed under the leadership of Dr. The blast did damage up to 900 km away, and despite detonating 4200m above surface, caused seismic disturbance greater than 5 on the Richter scale. An additional advantage in using HEU in large fission bombs is its cheapness relative to Pu-239 and U-233. The Tsar Bomba, the largest nuclear weapon ever detonated, was a hydrogen bomb with a 50 megaton yield. It was scaled down from a 100 megaton design to reduce the fallout created. The Tsar Bomba was a 50 megaton explosion, weighing 27,000 kg
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