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Keyword：reactor pressure vessel
3-meter-wide hole found at bottom of Unit 3 reactor pressure vessel at Fukushima Daiichi Nuclear Power Station: molten nuclear fuel burned through the base plate, TEPCO advances evaluation of debris removal project
The latest investigation data released by Tokyo Electric Power Company (TEPCO) shows that an irregular circular hole with a maximum diameter of 3 meters exists at the bottom of the reactor pressure vessel (RPV) of Unit 3 at the Fukushima Daiichi Nuclear Power Station (Fukushima No. 1 NPP). This is the first time since the March 11, 2011 Great East Japan Earthquake triggered a tsunami and caused core meltdown that TEPCO has determined the specific shape and dimensions of the damaged bottom of the pressure vessel among the three reactors that experienced meltdown. The conclusion is based on image data obtained by a technical team in March this year using palm-sized micro-drones to conduct 21 flight surveys inside the containment vessel of Unit 3. Based on the multi-angle...
2026-10-11
Hole of about 3 meters confirmed at bottom of reactor pressure vessel of Unit 3 at Fukushima Daiichi Nuclear Power Station
Tokyo Electric Power Company (TEPCO) announced on August 27 that a hole approximately 3 meters in diameter has been confirmed at the bottom of the reactor pressure vessel of Unit 3 at the Fukushima Daiichi Nuclear Power Station. The pressure vessel is a steel container that held nuclear fuel before the accident, with a cylindrical shape and a diameter of about 5.5 meters. This is the first time since the core meltdown accident at Units 1 to 3 of the Fukushima Daiichi Nuclear Power Station in 2011 that the specific size and shape of such a hole have been confirmed on the pressure vessel. The hole is believed to be related to the falling of melted nuclear fuel during the 2011 accident. After the accident, the containment vessel of Unit 3 has maintained a relatively high water level for an extended period, and access routes into the containment vessel are limited. TEPCO previously used a micro drone measuring approximately 12 centimeters per side...
2026-08-28
Rosatom says 13 small reactor pressure vessels at various production stages
Rosatom Director General Alexey Likhachev recently stated that 13 small reactor pressure vessels are currently at various production stages, and the equipment will be used for nuclear-powered icebreakers and small nuclear power plant projects. Likhachev noted that the batch includes reactor pressure vessels for the Uzbekistan nuclear power plant, which is planned to start construction in 2026. He said that the simultaneous manufacturing of 13 small reactor pressure vessels is unprecedented in the history of Russia's nuclear industry. The reactor pressure vessel is one of the core components of the primary circuit of a nuclear reactor, used to house the core and related internal structures, and withstand high temperatures and pressures during operation.
2026-07-30