Steam explosion major cause of human fatalities in volcanic eruptions. The 1986 Chernobyl nuclear disaster in Soviet Union was feared to cause major steam explosion (and resulting Europe-wide fallout) upon melting the lava-like nuclear fuel through the reactor's basement towards contact with residue fire-fighting water and groundwater. The threat was averted by frantic tunneling underneath the reactor in order to pump out water and reinforce underlying soil with concrete. When a pressurized container such as the waterside of a steam boiler ruptures, it is always followed by some degree of steam explosion. A common operating temperature and pressure for a marine boiler
Nuclear weapons and Ukraine territorial integrity of Ukraine. Despite Russia's claimed annexation of Crimea, which the UN General Assembly rejected as invalid, the Government of Ukraine in 2014 reaffirmed its 1994 decision to accede to the Nuclear Non-Proliferation Treaty as a non-nuclear-weapon state. After the Ukrainian Parliament voted to remove President Viktor Yanukovych from office, a power vacuum formed, and Russia annexed Crimea. The Russian pretext used nationalist and cultural rhetoric, claiming that the Russian military was protecting ethnic Russians from attack in Crimea and Eastern Ukraine. Russia's military actions violated the Budapest Memorandum. Pavlo Rizanenko, a member of the Ukrainian parliament told "USA