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Highest Yet: 412 sieverts/hr in Reactor No. 1 dry well — Japan says ‘defective meter’

412sv

Radiation dose, Unit 1 nuclear power plant Hukushima, atmc.jp, August 18, 2011:

h/t Anonymous tip, Jon_NY

Krypton-85 and xenon-131m detected in samples from Reactor No. 2 — Xenon-131m has half life of only 12 days

Fukushima I Nuke Plant: Krypton-85 and Xenon-131m in Reactor 2 Containment Vessel Air Samples, EX-SKF, August 11, 2011:

Half life of xenon-131m is about 12 days [...]

[W]hat’s with krypton and xenon? I also read a tweet by one of the workers at the plant who said there is still radioactive iodine being released, . . . → Read More: Krypton-85 and xenon-131m detected in samples from Reactor No. 2 — Xenon-131m has half life of only 12 days

Japan nuke expert: I presume melted fuel reacted violently with cement at Reactor No. 3, releasing large amounts of radioactive materials outside — TEPCO responds

Study says nuclear fuel at Fukushima reactor possibly melted twice, Kyodo, August 9, 2011:

[...] “I presume that the fuel fell to the bottom of the containment vessel made of concrete and reacted violently with its cement, releasing large amounts of radioactive materials into the outside from the pressure vessel,” said [Fumiya Tanabe, an . . . → Read More: Japan nuke expert: I presume melted fuel reacted violently with cement at Reactor No. 3, releasing large amounts of radioactive materials outside — TEPCO responds

“Most” of the fuel at Reactor No. 3 may have breached vessel after melting down twice

Report: Japan’s Fukushima reactor possibly melted twice, BNO News (Channel 6), August 8 2011:

According to a study, the crippled Fukushima Daiichi nuclear power plant might have suffered a second nuclear meltdown, Kyodo news agency reported Monday.

According to the study, which was conducted by nuclear safety expert Fumiya Tanabe, fuel inside one of . . . → Read More: “Most” of the fuel at Reactor No. 3 may have breached vessel after melting down twice

Japan nuclear expert: Massive “re-melting” occurred at Reactor No. 3 (DIAGRAM)

Japanese Researcher Says Reactor 3′s Fuel Melted Twice, Dropped to Containment Vessel, EX-SKF, August 8, 2011:

From Asahi Shinbun (3:02AM JST 8/8/2011; not the literal translation)

[Fumiya Tanabe, former head of the research at Japan Atomic Energy Agency] thinks the fuel melted and dropped to the bottom of the Reactor Pressure Vessel of Reactor . . . → Read More: Japan nuclear expert: Massive “re-melting” occurred at Reactor No. 3 (DIAGRAM)

Method for cooling Reactor No. 3 “isn’t cutting it” — Using triple the water as No. 1 and 2; A ‘considerable’ amount of water is missing target

TEPCO may use ‘shower spray’ on troubled reactor, Asahi Shimbun, August 05, 2011:

Tokyo Electric Power Co. is considering changing the method of injecting water into the No. 3 reactor at its hobbled Fukushima No. 1 nuclear power plant as the current system isn’t cutting it.

The No. 3 reactor is consuming nearly three . . . → Read More: Method for cooling Reactor No. 3 “isn’t cutting it” — Using triple the water as No. 1 and 2; A ‘considerable’ amount of water is missing target

New indoor radiation dose record at Fukushima — 5 sieverts per hour detected at Reactor No. 1 — May be higher as it exceeded capacity of measuring device

High-level radiation detected again at Fukushima Daiichi plant+, AP/Kyodo, August 2, 2011:

[... TEPCO] said radiation dosages of 5 sieverts per hour were detected indoors on the second floor of the No. 1 reactor at the plant. The amount is the highest figure for indoors.

The figure was detected in front of a pipe . . . → Read More: New indoor radiation dose record at Fukushima — 5 sieverts per hour detected at Reactor No. 1 — May be higher as it exceeded capacity of measuring device

Reactor No.3 requiring more water than No. 1 and 2 because of leaks and “other problems”

TEPCO seeks new ways to reduce contaminated water, NHK, July 27, 2011:

[...] Tokyo Electric Power Company sent a remote-controlled robot into the No.3 reactor building on Tuesday to take photos of the piping and measure radiation levels. [...]

TEPCO says the temperature of the No.3 reactor is relatively stable, but it needs more . . . → Read More: Reactor No.3 requiring more water than No. 1 and 2 because of leaks and “other problems”

Cesium-134 in water near Reactor No. 3 climbs to 30 times maximum limit — May have been caused by typhoon

Threat to Japan’s Food Chain Multiplies as Radiation Spreads, Bloomberg, July 24, 2011:

[...] Levels of cesium-134 in seawater near the Fukushima plant’s No. 3 reactor rose to levels 30 times the allowed safety standards last week, according to tests performed by Tokyo Electric Power Co, national broadcaster NHK reported. [...]

Threat to Japan’s . . . → Read More: Cesium-134 in water near Reactor No. 3 climbs to 30 times maximum limit — May have been caused by typhoon

Typhoon increases level of radioactive water in Reactor No. 1 basement by 17 inches in a day — Likely to continue rising

Rain increases contaminated water at plant, NHK, July 21, 2011

Heavy rain brought by a tropical storm has increased the level of radioactive contaminated water at the basements of the crippled Fukushima Daiichi nuclear power plant. [...]

Tokyo Electric Power Company or TEPCO, the plant’s operator, says that at 7 AM local time on . . . → Read More: Typhoon increases level of radioactive water in Reactor No. 1 basement by 17 inches in a day — Likely to continue rising

TEPCO rushing to shield Reactor No. 3 turbine building from typhoon — Navy: Storm may pass over Fukushima plant by July 21

Typhoon Spurs Tepco to Cover Fukushima, Bloomberg, July 17, 2011:

Tokyo Electric Power Co. is rushing to install a cover over a building at its crippled Fukushima Dai-Ichi nuclear plant to shield it from wind and rain as Typhoon Ma-on approached Japan’s coast from the south.

The cover will be placed over the turbine . . . → Read More: TEPCO rushing to shield Reactor No. 3 turbine building from typhoon — Navy: Storm may pass over Fukushima plant by July 21

Reactor No. 3: Containment vessel not holding air pressure — Gas may be leaking from damaged part of container, says TEPCO (VIDEO)

TEPCO checking for gas leak from No. 3 reactor, NHK, July 15, 2011:

[...] Tokyo Electric Power Company has injected more than 200 cubic meters of nitrogen into the [No. 3] reactor’s containment vessel since Thursday evening. But it says the interior air pressure has increased very little.

TEPCO says gas may be leaking . . . → Read More: Reactor No. 3: Containment vessel not holding air pressure — Gas may be leaking from damaged part of container, says TEPCO (VIDEO)

TEPCO having trouble injecting nitrogen to avoid explosion at Reactor No. 3 — Expert concerned about possible explosion at No. 3

Hose leak again halts water unit, Kyodo, June 30, 2011:

[...] Tepco has also made little progress in injecting nitrogen into reactor 3′s containment vessel to prevent an explosion.

It began sending nitrogen into the No. 2 unit’s containment vessel Tuesday, but a high level of radiation within the No. 3 building is obstructing . . . → Read More: TEPCO having trouble injecting nitrogen to avoid explosion at Reactor No. 3 — Expert concerned about possible explosion at No. 3

High-tech equipment is malfunctioning around Reactor No. 2

Robot, drone fail on Japan nuke-plant missions, AP, June 24, 2011:

[...] The Quince robot [...] had ventured out into the Unit 2 reactor building to set up a gauge to measure the contaminated water pooling in the basement. Radioactivity inside the reactor buildings is too high for workers to take measurements there.

The . . . → Read More: High-tech equipment is malfunctioning around Reactor No. 2

Unmanned helicopter crash lands on Reactor No. 2

Unmanned helicopter crash lands at nuke plant, NHK, June 24, 2011:

The operator of the Fukushima Daiichi nuclear power plant says it lost control of an unmanned helicopter during a flight near the No. 2 reactor building, forcing the controller to make an emergency landing on a roof there.

Tokyo Electric Power Company says . . . → Read More: Unmanned helicopter crash lands on Reactor No. 2

Reactor No. 2 basement filled with radioactive “rust red” colored water measuring 430 millisieverts per hour at surface (PHOTO)

rustred

Work begins inside No.2 reactor building, NHK, June 22, 2011 . . . → Read More: Reactor No. 2 basement filled with radioactive “rust red” colored water measuring 430 millisieverts per hour at surface (PHOTO)

Reactor No. 3 temperature up 7°C in a day

Temperature at No.3 reactor rises, NHK, June 22, 2011:

The operator of the troubled Fukushima Daiichi nuclear power plant says temperatures at the No.3 reactor have started to rise after it reduced the injection rate of cooling water [...] by 1 ton [...]

TEPCO says that by 5 AM on Wednesday, temperatures at the . . . → Read More: Reactor No. 3 temperature up 7°C in a day

TEPCO: Excessively high radiation at Reactor No. 2 — Abrupt jump may be from leaking pressure chamber

Radiation levels in Fukushima basement too high – TEPCO, Voice of Russia, June 22, 2011:

[...] TEPCO, says in a statement that radiation levels in the basement of the second reactor is excessively high, with the level of accumulated water exceeding 6 metres.

According to experts, the abrupt jump in radiation may have been . . . → Read More: TEPCO: Excessively high radiation at Reactor No. 2 — Abrupt jump may be from leaking pressure chamber

1.6 billion becquerels of radioactive materials released from Reactor No. 2 late Sunday, says TEPCO

Japan pumps water into reactor to contain radioactivity, Deutsche Presse-Agentur, June 20, 2011:

TEPCO also began late Sunday to release air containing radioactive substances from the building of reactor 2 by opening its doors.

An estimated 1.6 billion becquerels of radioactive materials were released, compared with 500 million becquerels when the double doors of . . . → Read More: 1.6 billion becquerels of radioactive materials released from Reactor No. 2 late Sunday, says TEPCO

Reactor No. 1 dry well hits 263 Sv/hour — Highest yet recorded

263sv

Radiation dose, Unit 1 nuclear power plant Hukushima, atmc.jp, June 16, 2011:

h/t Lucas Whitefield Hixson

300 square centimeter hole in Reactor No. 2 pressure suppression pool: NISA analysis

TEPCO starts up water treatment system, but massive radioactive waste feared, Mainichi, June 16, 2011:

[...] At the No. 2 reactor, a hydrogen explosion damaged the pressure suppression pool. According to analysis by the Nuclear and Industrial Safety Agency, there is a hole of about 300 square meters there. Therefore, in order to circulate . . . → Read More: 300 square centimeter hole in Reactor No. 2 pressure suppression pool: NISA analysis

After explosion at Reactor No. 3, TEPCO said it was too dangerous and time to evacuate plant

In Nuclear Crisis, Crippling Mistrust, New York Times, June 12, 2011:

Then on March 14, the gravity of the plant’s situation was revealed by a second explosion, this time at Reactor No. 3, and a startling request that night from Tepco’s president, Masataka Shimizu: that Tepco be allowed to withdraw its employees from the . . . → Read More: After explosion at Reactor No. 3, TEPCO said it was too dangerous and time to evacuate plant

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