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K-8, 1960: suffered a loss-of-coolant accident; substantial radioactivity released.[22]
K-14, 1961: the reactor compartment was replaced due to unspecified "breakdown of reactor protection systems".
K-19, 1961: suffered a loss-of-coolant accident resulting in 8 deaths and more than 30 other people being over-exposed to radiation.[23] The events on board the submarine are dramatized by the film K-19: The Widowmaker.
K-11, 1965: both reactors were damaged during refueling while lifting the reactor vessel heads; reactor compartments scuttled off the east coast of Novaya Zemlya in the Kara Sea in 1966.
K-27, 1968: experienced reactor core damage to one of its liquid metal (lead-bismuth) cooled VT-1 reactors, resulting in 9 fatalities and 83 other injuries; scuttled in the Kara Sea in 1982.[2]
K-140, 1968: the reactor was damaged following an uncontrolled, automatic increase in power during shipyard work.[24]
K-429, 1970: an uncontrolled start-up of the ship's reactor led to a fire and the release of radioactivity[24]
K-116, 1970: suffered a loss-of-coolant accident in the port reactor; substantial radioactivity released.
K-64, 1972: the first Alfa-class liquid-metal cooled reactor failed; reactor compartment scrapped.
K-222, 1980: the Papa-class submarine had a reactor accident during maintenance in the shipyard while the ship's naval crew had left for lunch.[24]
K-123, 1982: the Alfa-class submarine reactor core damaged by liquid-metal coolant leak; the sub was forced out of commission for eight years.[24][25]
K-431, 1985: a reactor accident while refueling resulted in 10 fatalities and 49 other people suffered radiation injuries.[3]
K-219, 1986: suffered an explosion and fire in a missile tube, eventually leading to a reactor accident; a 20-year-old enlisted seaman, Sergei Preminin, sacrificed his life to secure one of the onboard reactors. The submarine sank three days later.
K-192, 1989 (reclassified from K-131): suffered a loss-of-coolant accident due to a break in the starboard reactor loop.
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