The record of this is very incomplete.
http://www.stripes.com/news/up-to-the-minute-1.137684 The items are printed in the order in which they appear at the Stars and Stripes site above.
The Stars and Stripes Magazine – the organ of the US Armed Forces – published various items in regard to the fire in the spent fuel pool of reactor number 4 as follows:
10 p.m. Tuesday local Tokyo time, rStars and Stripes eporter: Geoff Ziezulewicz, citing the BBC : …..This latest warnings come after the plant was stricken by a third reactor explosion in four days, the latest of which appears to have damaged one of the reactors’ containment systems for the first time, raising the specter of a more serious radioactive leak.
A fire also briefly broke out at the plant’s reactor 4 Tuesday, BBC reports, although that reactor had been shut down for maintenance before Friday’s 9.0 earthquake.
4:20 p.m. Tuesday local Tokyo time, source: Associated Press:
High levels of radiation leaked from a crippled nuclear plant in tsunami-ravaged northeastern Japan after a third reactor was rocked by an explosion Tuesday and a fourth caught fire in a dramatic escalation of the 4-day-old catastrophe. The government warned 140,000 people nearby to stay indoors to avoid exposure.
Tokyo also reported slightly elevated radiation levels, but officials said the increase was too small to threaten the 39 million people in and around the capital, about 170 miles away.
12:30 p.m. Stars and Stripes reporter – Tim Wightman
Power plant reactor fire extinguished
TOKYO – Japan’s nuclear safety agency says a fire in a reactor at the Fukushima nuclear power plant in tsunami-ravaged northeastern Japan has been extinguished, The Associated Press is reporting. The fire broke out Tuesday at the nuclear plant, located in one of the provinces hardest-hit by last week’s massive earthquake and tsunami.
11:45 a.m. Stars and Stripes Reporter – Tim Wrightman
TOKYO – Japan Prime Minister Naoto Kan has told people living within 19 miles (30 kilometers) of the Fukushima Dai-ichi complex to stay indoors or risk getting radiation sickness, The Associated Press is reporting.
Chief Cabinet Secretary Yukio Edano said Tuesday that a fourth reactor at the Fukushima Dai-ichi complex was on fire and that more radiation was released.
Kan also warned that more leaks could occur.
10:55 a.m. Tuesday Stars and Stripes Reporter Tim Wrightman
TOKYO – The early Tuesday explosion at the Fukushima Dai-ichi nuclear power plant may have damaged a reactor’s container, leading Japan’s nuclear safety agency to suspect a radiation leak, The Associated Press is reporting.
According to agency spokesman Shigekazu Omukai, the nuclear core of Unit 2 of the plant was not damaged in the explosion. But the agency suspects damage to the bottom of the container that surrounds the generator’s nuclear core, which could’ve caused radiation to escape.
The fire at reactor 4 has been poorly described in the sources I have read.
The early releases from the plant have been characterised by nuclear esperts as consisting primarily Iodine isotopes and Cesium isotopes. So officially these substances characterise the nature of the Fukushima fallout clouds which issued from the stricken massed reactors in the early stages of the concealed for 3 months multiple meltdowns. If the experts are to be believed in such a demonstrably and admitted (now, 2 years later) deceptive scenario.
The Stars and stripes repeatedly reported evens regarding the fire at Reactor 4 without describing what, exactly was on fire. However, at the same time as the fire was reported, it was also reported that the Japanese Prime Minister ordered people to stay indoors or “risk getting radiation sickness.”
If we accept that the early clouds were hazardous because of Iodine and Cesium, what was in the clouds produced by the fire at reactor Number 4? We won’t know until we look at what was on fire.
We need to understand though that the danger of the clouds issued from the stricken nuclear plant may have varied according to substances which comprised them. Cesium and Iodine in the quantities released present one set of hazards. Those substances being in the clouds as a result of their chemical natures – cesium for example has a very low melting and a low vaporisation point. (cesium: Melting Point: 301.59 K (28.44°C or 83.19°F) Boiling Point: 944 K (671°C or 1240°F) http://education.jlab.org/itselemental/ele055.html. This is rational reason for imagining cesium isotopes predominated in the early pollution clouds from the stricken massed reactors.
Is there any source which examines the content of later emissions clouds, and any source which explains what precisely was on fire at reactor number 4?
A bundled of documents obtained from the US NRC via FOIA is found at:
Amongst the bundle of documents is the following IAEA alert: