This incident occurred at the hydrogen production and storage unit of (probably) a power plant using hydrogen as a coolant of the turbine-generator system. Hydrogen was produced probably by water electrolysis (the source does not say it) and stored in 6 steel tanks. One of the six hydrogen storage tanks exploded killing a staff member. The investigation determined that a mixing of hydrogen and oxygen occurred in the tank. The needle valve of the hydrogen and oxygen pressure regulator as jammed, and the oxygen leaked into the hydrogen main supply line and entered the hydrogen tank.

The incident occurred at a power generator during the shutdown of one reactor unit. Hydrogen leaked from the cooling circuit of the generator due to damaged sealing. The hydrogen ignited. The fire was extinguished after 1 hour 40 minutes.

There was a massive explosion at one of the generator-turbine units of a coal-based power station. Undetected hydrogen leak from the generator was identified as a major trigger.According to the news, some workers, unaware of the leak, were trying to fix some dirt blocks and loose nuts and bearings in the generator. Just below was an oil tank. Fire sparked spread in minutes up to 16 metres, setting off the blast with a heavy noise.It took hours to control the fire. Four persons were injured.

The incident occurred at the hydrogen coolant circuit, when purging the hydrogen with carbon dioxide and air, aiming at finding a leak. Following a preliminary investigation, the power plant company explained that hydrogen was still present when air was injected, creating the condition for the formation of an explosive mixture. According to the sources referred to news mentioned in the References, it appears during the leak search activity, workers deviated from the established procedure.

A catastrophic failure of the low pressure turbine followed by fire and flooding severely damaged the generator. The main turbine automatically tripped due to an erroneous mechanical over speed signal caused by high vibrations. The reactor, which was operating at 93 percent power, received an automatic scram signal triggered by the turbine trip. The high vibration was caused by catastrophic failure of the turbine blades. Ejected blade parts ripped through the turbine casing and severed condenser tubes and other piping.

A hydrogen fire occurred in a nuclear power plant outside the controlled area. The leaking point was on a pipe system of the distribution circuit of the gas network (6 bar nominal working pressure). The specific location was a joint on the fire-protection cupboard containing the hydrogen cylinders. The fire started during a repairing intervention on a cupboard nearby, performed by a sub-contractor using a hot surface welding equipment. Internal emergency services isolated and depressurized the pipes, and extinguished the flame.

A hydrogen leak occurs at a gas cylinder storage tank park in a nuclear power plant. Employees locate the origin of the leak on a defective pressure regulator. They isolate the hydrogen release and secure the park. 10 m of gas, the equivalent of one and a half cylinders, escaped.

The accident took place when replacing a pallet of empty hydrogen cylinders with a new full one. The pallet in service (almost empty) was not disconnected from the gas supply line. When the operator in charge of handling (fork lift) begun to remove the pallet in service from its position, he teared off the hose connecting it to the pressure relief system. The pressurised hydrogen in the pipes and in the pallet escaped and ignited. The intervention of the teams from the plant and external emergency services extinguished the fire in 1h45.

A hydrogen skid was placed into service in a nuclear power plant, outside the controlled area. This skid, like seven others, was located in a gas cylinder storage facility. It was supplied by several hydrogen cylinders at a pressure of 200 bar. As its pressure was rising, a trap on the skid was blown off, causing the hydrogen to leak and ignite. The flaming jet measured 40 cm and continued as the system was open. Surprised by the incident, an employee fell and slightly injured his arm.

At 11:15 pm, an explosion followed by fire occurred in the vicinity of the measurement transformer on an isolated 90,000 V electrical oil transformer at a plant manufacturing technical polymers. Plant personnel placed the installations in safe operating mode, while the backup line and 15,000 V transformer were activated, in coordination with the electric grid operator to keep the sites supply lines open. The risk of falling electrical cables led to closing the adjacent departmental highway, and the emergency crew installed a protective fire hose.