Tag "suppression chamber"

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Tepco investigated the torus room of reactor1

Tepco investigated the torus room of reactor1 by drilling the wall. They failed in investigating the torus room of reactor2. (cf, [Unanticipated] Tepco failed in investigating the torus room of

Core removing struggle

[Column] Amateur doctor

Tepco tried to open a hole to look inside of the torus room of reactor2. Torus room is where S/C is located. S/C is the coolant facility of nuclear reactor

Core removing struggle Plant hazard

[Disorder ?] Radiation level spiked up to 35.23 Sv/h in suppression chamber of reactor2 as the indicated heat went up

A thermometer indicated the RPV temperature is rapidly increasing in reactor2. (cf, [Disorder ?] A thermometer of reactor2 RPV indicating the rapid increase of heat, it reached 152.1℃ on 12/30/2012

Core removing struggle Plant hazard

Tepco to inject nitrogen gas into the suppression chamber of reactor2 as well, “Kr-85 and Hydrogen gas increase”

According to the mid/long term roadmap of Tepco released on 12/25/2012, increase of Kr-85 and hydrogen gas has been observed in PCV of reactor2. Kr-85 and hydrogen gas are fission

Core removing struggle Cover-ups

Fractured fuel may be in suppression chamber and reactor building, No technology to identify, No governmental policy

According to the minutes of mid/long term Fukushima measures R&D meeting held on 10/22/2012, Tepco is aware of the fact that fractured fuel debris has moved to the suppression chamber

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Tepco injected nitrogen gas into reactor2 and 3 as well

On 10/23/2012, Fukushima Diary reported Tepco started injecting nitrogen gas into suppression chamber of reactor1 to avoid the risk of explosion. [Link] According to Tepco’s report “Mid/long term roadmap of

Core removing struggle

Hydrogen concentration rapidly increased in PCV reactor1

Tepco has been injecting nitrogen gas into suppression chamber of reactor1 since 10/23/2012. (cf. To avoid the risk of explosion, Tepco is to inject nitrogen gas to suppression chamber of

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To avoid the risk of explosion, Tepco is to inject nitrogen gas to suppression chamber of reactor1 for a month

Tepco is going to inject nitrogen gas to suppression chamber of reactor1. Fukushima TV reported, reactor1 has been having density of hydrogen gas and Krypton unstable since this April. Tepco

Core removing struggle

Radiation level is higher out of PCV than inside in reactor1, “Is really core inside of PCV ?”

On 10/12/2012, Tepco measured radiation level in retained water of PCV1. The cesium level was lower than water retained outside of PCV, Suppression chamber, inside of the reactor building though core

Core removing struggle

Tepco developing remote controlling robots, wall crawler, airship, RPV diver, etc..

On 9/24/2012, R&D department of Tepco released the latest report about remote technique to invest Fukushima plant. Tepco can’t investigate the crippled Fukushima plant with the existing technology. They are