If left unchecked, the Chernobyl reactor fire could have burned for several days to weeks. The graphite moderator and other materials in the reactor were highly flammable, and without intervention, the fire could have continued until the reactor core was sufficiently cooled or until all combustible materials were consumed. However, emergency responders were able to extinguish the fire within about 10 days, preventing further catastrophic releases of radioactive materials.
It was not controlled, once the top of the reactor was blown off there was nothing anyone could do. The fuel melted and ran down, whilst the graphite burned away, so this would stop the nuclear reaction. The task then was to put out the fire which was still raising radioactive material into the atmosphere. This was done partly by firemen with hoses (many of whom died from radiation) and by dropping material onto the burning reactor from helicopters.
At Chernobyl there was a steam explosion which blew off the top of the reactor followed by a fire due to the graphite moderator burning in air, and a huge amount of radioactive material was discharged, including fission products from the fuel. I'm not sure which fast reactor you are referring to, but certainly the incident did not involve massive catastrophic failure of the reactor vessel, or it would have become a world incident as Chernobyl did.
The reactor at Chernobyl was not a water cooled reactor like virtually all of the United States reactors. This was certainly a contributing factor to the disaster. More safety controls and more testing of these devices would have also helped the issue, along with backups to the safety shutdown devices.
The chernobyl reactor had only been finished and placed in operation a few years earlier and had been rushed in construction, skipping several important safety tests to meet the construction schedule. The primary cause of the accident that night was trying to perform one of these tests with the reactor in a very unstable range of operation that the procedures required immediate shutdown of the reactor for safety. The test supervisor ordered the operators to keep the reactor running and disable automatic shutdown and safety systems so he could proceed with the test without interruption. If they would not follow his orders he would replace them with operators that would. They did. The result was the reactor was destroyed, many people died, and vast areas around it were contaminated. RBMK reactors are inherently unsafe. The chernobyl reactor site will remain radioactive for hundreds of thousands of years. Unfortunately the sarcophagus is already wearing out and will have to be replaced at least every 50 years.
The worst damaged reactor would require complete demolition and rebuilding to repair it and the levels of radiological contamination in the area are unsafe for such work and of a nature as to make cleanup impractical. The best course of action at this time is encapsulation of the reactor to prevent further contamination of the surrounding area (much like at Chernobyl).
The Chernobyl disaster occurred on April 26, 1986, primarily due to a flawed reactor design and serious violations of safety protocols during a test. Operators attempted to conduct an experiment to determine how long turbines would continue to produce power after a reactor shutdown, but a series of miscalculations and a lack of understanding of the reactor's behavior led to an uncontrolled reaction. This resulted in a catastrophic explosion and the release of a massive amount of radioactive material into the environment. The combination of technical failures, human error, and inadequate regulatory oversight contributed to the disaster.
explain how a fusion reactor would be similar to a fission reaction
The incident changed safety precautions throughout the world because it showed the world what could happen if a reactor did explode and what the effects would have been and the effects were devastating.
The Chernobyl accident was triggered by a flawed reactor design and a series of operator errors during a safety test on April 26, 1986. Operators attempted to conduct an experiment to determine how long the turbines would spin and generate power after a shutdown. However, due to improper procedures and a lack of understanding of the reactor's behavior at low power, a sudden power surge occurred, leading to an explosion and the release of a significant amount of radioactive material into the atmosphere.
Overheating of the reactor fuel rods could damage the zircaloy sheaths and enable gaseous fission products to enter the reactor coolant stream. This alone would not be dangerous, but if a loss of coolant had caused the overheating then this could release activity into the secondary containment. What would follow from this depends on the individual design of the plant.
There were so many things that went wrong at Chernobyl that it's not entirely clear whether "proper training" would have helped or not. It's true that the a delay in the test that resulted in the disaster meant that it was being performed by the night shift instead of by the day shift who had been prepared in advance for the reactor shutdown and testing. However, many people who had had sufficient training to know better made bad decisions that cumulatively led to this situation, and there were some problems with the reactor design itself that certainly at least contributed to the disaster.
The Chernobyl incident occurred on April 26, 1986, due to a flawed reactor design and serious mistakes made by the plant operators during a safety test. The test aimed to determine how the reactor would respond in a power outage but was conducted with inadequate safety protocols, leading to an uncontrolled reaction. This resulted in a catastrophic explosion, releasing a significant amount of radioactive material into the atmosphere. The combination of design flaws, operator errors, and a lack of safety culture contributed to the disaster's severity.