Newsgroup: it.discussioni.energie-alternative
Titolo: Fukushima timeline

Monday, 21 March
15:55
     Grey smoke is seen being emitted from the southeast corner of the 
Reactor Building #3 at the Fukushima Daiichi plant. TEPCO evacuated the 
site in response to the smoke. That location is close to the spent fuel 
pond of the reactor.[97]
19:00
     White smoke is seen being emitted from Reactor Building #2 at the 
Fukushima Daiichi plant. [98]
http://en.wikipedia.org/wiki/Timeline_of_the_Fukushima_nuclear_accidents
-- 
Sandro kensan 
www.kensan.it
 geek site

 
http://en.wikipedia.org/wiki/Timeline_of_the_Fukushima_nuclear_accidents
La tabella in inglese fa riferimento questo reattore (immagine del BWR 
giapponese):
http://www.fepc.or.jp/english/nuclear/power_generation/mechanism/sw_mechanism_01/index.html
e ha questo significato:
Fuel integrity (Integrit� del carburante nucleare ricoperto da zirconio)
Pressure vessel integrity (Vessel (contenitore) che contiene il core 
cio� le barre di uranio, integrit�)
Containment integrity (Vessel (contenitore) che contiene il Pressure 
Vessel, integrit�)
Core cooling system 1 (ECCS/RHR) (Sistema 1 di raffreddamento del core)
Core cooling system 2 (RCIC/MUWC) (Sistema 2 di raffreddamento del core)
Building integrity (Edificio di contenimento, Containment Building 
(contiene il Containment Vessel che a sua volta contiene il Pressure 
Vessel, integrit�)
Pressure vessel, water level (Vessel (contenitore) che contiene il core 
cio� le barre di uranio, livello dell'acqua)
Pressure vessel, pressure (Vessel (contenitore) che contiene il core 
cio� le barre di uranio, pressione)
Containment pressure (Vessel Containment, pressione)
Seawater injection into core (Iniezione di acqua di mare nel core dove 
si trovano le barre di uranio)
Seawater injection into containment building (Iniezione di acqua di mare 
nell'edificio di contenimento)
Containment venting (Vessel Containment, ventilazione ovvero apertura 
delle valvole in caso di sovrapressione)
Integrity of fuel in Spent Fuel Pool (SFP) (Integrit� del carburante 
nucleare nelle piscine del carburante esausto)
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http://en.wikipedia.org/wiki/Timeline_of_the_Fukushima_nuclear_accidents
Tuesday, 22 March
Immediate threat is damage to fuel in the spent fuel pool (SFP), which 
is outside the containment vessel. Spraying water onto the SFPs in Units 
3 and 4 is continuing. Reductions in ambient radiation around the plant 
suggest that this spraying has been effective in cooling down the SFPs.
Seawater injection to the Unit 2 fuel pool was conducted on Mar. 20th. 
Work to recover grid power for the entire plant is in progress.　 So far 
power has been restored to the distribution switchboard for Unit 2. 
Integrity checks of electrical equipment in Unit 2 are in progress; 
these must be completed before the equipment can be energized. 　Grid 
power has also been partly restored to Unit 5 (which continues to run 
from its emergency diesel generators). Radiological screening dairy and 
agricultural products, such as milk in Fukushima and spinach in Ibaraki 
prefectures, revealed levels of radioisotopes in excess of national 
regulatory standards. Shipment of these products has been restricted 
until further notice. Seawater sampled at the front coast of the station 
contained radioactive iodine (131I) and cesium (134Cs and 137Cs) levels 
exceeding the regulatory limit. Data collected by an IAEA team show 
radiation levels of 161 µSv/h in the town of Namie, Fukushima 
Prefecture, 20km from the power plant. This level is 1,600 times higher 
than normal.
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