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Tokyo U. nuke expert: Radioactive substances may have “poured” into pipe during explosion — Levels could also be extremely high outside Reactors No. 3 and 4

Record radiation at Fukushima N-plant / More than twice previous peak level, The Yomiuri Shimbun, August 3, 2011:

[...] “As well as radiation spilling out when the vents were opened, we can’t rule out that radioactive substances poured into the pipe during the hydrogen explosion” that damaged the reactor on March 12, [Kenzo Miya, . . . → Read More: Tokyo U. nuke expert: Radioactive substances may have “poured” into pipe during explosion — Levels could also be extremely high outside Reactors No. 3 and 4

NYT: Fatal Radiation Level Found at Fukushima — “Exceeded” 10 sieverts per hour, measuring device was maxed out

Fatal Radiation Level Found at Fukushima Daiichi Plant, New York Times by Martin Fackler, August 1, 2011:

The operator of the Fukushima Daiichi nuclear plant said Monday that it measured the highest radiation levels within the plant since it was crippled by a devastating earthquake. However, it said the discovery would not slow continuing . . . → Read More: NYT: Fatal Radiation Level Found at Fukushima — “Exceeded” 10 sieverts per hour, measuring device was maxed out

“Highest radiation level since the start of the nuclear crisis”: 10 sieverts per hour measured outside between Reactors No. 1 and 2

Highest radiation level monitored at stricken Japan nuclear plant, Deutsche Presse-Agentur, August 1, 2011:

The operator of a crippled Japanese atomic power plant said Monday it had measured the highest radiation level since the start of the nuclear crisis, a news report said.

Tokyo Electric Power Co (TEPCO) said more than 10 sieverts per . . . → Read More: “Highest radiation level since the start of the nuclear crisis”: 10 sieverts per hour measured outside between Reactors No. 1 and 2

NHK News Flash: Electricity cut at Reactors No. 3 and 4, cooling system shut down — TEPCO says no “major” change in radiation around plant

External power supply cut at 2 Fukushima reactors, NHK, July 22, 2011:

Tokyo Electric Power Company says part of the external power supply has been cut at the Fukushima Daiichi nuclear plant due to a problem in the transmission lines [...] cutting off electricity to the No. 3 and 4 reactors.

The operator was . . . → Read More: NHK News Flash: Electricity cut at Reactors No. 3 and 4, cooling system shut down — TEPCO says no “major” change in radiation around plant

Reactors No. 5 and 6 contain 8,000 tons of radioactive water — Will be transferred to megafloat over next few months

TEPCO starts system to cool another spent fuel pool at nuclear plant, Kyodo, July 1, 2011:

[...] As for the steel megafloat, which is berthed at a quay near the plant, about 8,000 tons of low-level radioactive water will be transferred over the next three or four months. The government’s nuclear safety agency said . . . → Read More: Reactors No. 5 and 6 contain 8,000 tons of radioactive water — Will be transferred to megafloat over next few months

Flashes followed by increased smoke/steam near Reactors No. 3 and 4 (VIDEO)

Strange flashes followed by increased smoke/steam near Reactors No. 3 and 4 (VIDEO)

TEPCO Reactor 4 SFP Large Release Fukushima Daiichi June 16, CompassNorthChicago, June 16, 2011:

Flashes at 1:45 in and 2:35 in

h/t Lucas Whitefield Hixson

Workers found with over 600 millisieverts of radiation after being in control rooms of Reactors No. 3 and 4 — Only tested them for iodine and cesium

Fukushima workers’ exposure tops 650mSV, NHK, June 10, 2011:

[...] The National Institute of Radiological Sciences conducted 2 more rounds of detailed tests to measure the amount of radioactive iodine and cesium the 2 men could have inhaled.

After analyzing the men’s work shifts since the March 11th disaster, the Institute concluded that the . . . → Read More: Workers found with over 600 millisieverts of radiation after being in control rooms of Reactors No. 3 and 4 — Only tested them for iodine and cesium

Blackouts hit Reactors No. 1 and 2 — Nitrogen injections to prevent explosions stopped

Japan’s Tepco hit by power outages at Fukushima-1 nuclear plant, Platts, June 8, 2011:

Japan’s Tokyo Electric Power Company has been hit by power outages at the No.1 and No.2 reactors at its Fukushima-1 nuclear power plant Wednesday afternoon, resulting in the suspension of nitrogen injection into the No.1 reactor, a company official said. . . . → Read More: Blackouts hit Reactors No. 1 and 2 — Nitrogen injections to prevent explosions stopped

TEPCO acknowledges ‘vapor’ is still being seen at Reactors No. 2, 3 and 4 spent fuel pools

Tepco Plans New System to Cool Reactors, Wall Street Journal by Kosaku Narioka, May 22, 2011:

[...] The troubled utility, known as Tepco, said it plans to build a cooling system with water-circulation pumps and heat-exchange equipment by the end of May at the reactor No. 2 spent-fuel pool, by June at the reactors . . . → Read More: TEPCO acknowledges ‘vapor’ is still being seen at Reactors No. 2, 3 and 4 spent fuel pools

Report: Reactor No. 1 “exploded” after full meltdown — Similar pattern of disaster befell Reactors No. 2 and 3

Fukushima plant probably began spewing radiation within hours of earthquake: data, National Post, May 21, 2011 . . . → Read More: Report: Reactor No. 1 “exploded” after full meltdown — Similar pattern of disaster befell Reactors No. 2 and 3

Rapid meltdown happened at Reactors No. 2 and 3 — Indicated by black smoke at No. 3

Work to Continue at Japan Plant Despite Release of Meltdown Details, Hiroko Tabuchi for The New York Times, May 17, 2011:

[... TEPCO] now acknowledges that a fuel meltdown occurred at three of the plant’s six reactors in the early hours of the crisis, something experts had been suggesting for weeks. [...]

Tokyo Electric . . . → Read More: Rapid meltdown happened at Reactors No. 2 and 3 — Indicated by black smoke at No. 3

Melting of nuclear fuel at Reactors No. 2 and 3 “extensive if not complete” — “Far more dire than previously recognized”

Utility: Fukushima Cores More Damaged Than Thought, Science Magazine by Dennis Normile, May 17, 2011 at 2:20 pm EDT:

Over the last several days, evidence has emerged indicating that the situation at the Fukushima Daiichi Nuclear Power Plant was far more dire than previously recognized. The main evidence is extensive—rather than partial—melting of the . . . → Read More: Melting of nuclear fuel at Reactors No. 2 and 3 “extensive if not complete” — “Far more dire than previously recognized”

WSJ says “meltdown” at Reactors No. 2 and 3

Cores Damaged at Three Reactors, Wall Street Journal, May 16, 2011 at 3:03 pm EDT . . . → Read More: WSJ says “meltdown” at Reactors No. 2 and 3

Tepco says fuel in Reactors No. 2 and 3 may have melted — Announcement about the two reactors “will be made later”

Tepco Says Fuel in 2 Reactors May Have Melted, Bloomberg by Michio Nakayama and Yuji Okada, May 16, 2011:

Tokyo Electric Power Co. said fuel in other reactors at its damaged nuclear plant may have melted, after confirming rods in the No. 1 unit had fallen from their assembly, potentially delaying plans to resolve . . . → Read More: Tepco says fuel in Reactors No. 2 and 3 may have melted — Announcement about the two reactors “will be made later”

Moody’s cuts TEPCO credit rating after today’s news about Reactors No. 2 and 3, saying damage at plant “appears worse than previously indicated”

Tepco Says Fuel in 2 Reactors May Have Melted, Bloomberg by Michio Nakayama and Yuji Okada, May 16, 2011:

Tokyo Electric Power Co. said fuel in other reactors at its damaged nuclear plant may have melted, after confirming rods in the No. 1 unit had fallen from their assembly [...]

Moody’s Japan K.K. cut . . . → Read More: Moody’s cuts TEPCO credit rating after today’s news about Reactors No. 2 and 3, saying damage at plant “appears worse than previously indicated”

Cesium found near drainage gates at Reactors No. 5 and 6

Radioactivity at intake of No.3 reactor rises, NHK, May 16, 2011:

Tokyo Electric Power Company says it measured 200 becquerels of cesium-134 per cubic centimeter on Sunday morning near the water intake of the No. 3 reactor. The level was higher than on the previous day, when it was 2,300 times the legal limit. . . . → Read More: Cesium found near drainage gates at Reactors No. 5 and 6

TEPCO: Water level data from Reactors No. 2 and 3 “may not be credible” after what happened at No. 1

Reactor 1 in worse shape than thought, Japan Times, May 13, 2011:

[TEPCO's] Matsumoto also said that, considering the situation with the No. 1 reactor, the water level data from reactors 2 and 3 may not be credible. [...]

According to Tepco, the water-level indicators of the [No. 1] pressure vessel had indicated . . . → Read More: TEPCO: Water level data from Reactors No. 2 and 3 “may not be credible” after what happened at No. 1

“Unusual amount of smoke” billowing from Reactors No. 3 and 4 “nothing to be concerned about” says TEPCO, Japan gov’t

Japan: New Smoke At Nuclear Plant, CBS, May 8, 2011 . . . → Read More: “Unusual amount of smoke” billowing from Reactors No. 3 and 4 “nothing to be concerned about” says TEPCO, Japan gov’t

TEPCO admits No. 1 and No. 2 reactors suffered more damage than originally believed

Power restored to Japanese reactor’s control room, officials say, CNN, March 22, 2011 at 12:37 pm EDT:

… Earlier Tuesday, Tokyo Electric Vice President Sakae Muto said the No. 1 and No. 2 reactors at the plant suffered more damage from seawater than originally believed and will take more time to repair.

The tsunami . . . → Read More: TEPCO admits No. 1 and No. 2 reactors suffered more damage than originally believed