High Quality Content by WIKIPEDIA articles! In nuclear weapons, a fizzle occurs when the testing of a nuclear bomb fails to meet its expected yield. The reason(s) for the failure can be linked to improper bomb design, poor construction, or lack of expertise. All countries that have had a nuclear weapons testing program have experienced fizzles. A fizzle can spread radioactive material throughout the surrounding area, involve a partial fission reaction of the fissile material, or both. For practical purposes, a fizzle can still have considerable explosive yield when compared to conventional weapons. These considerations were taken into account at the first Trinity test by a vessel named Jumbo.