Japanese Cabinet received advice predicting that the fuel would be damaged and the pressure vessels would be breached on March 11

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[box_dark]21:40 forecast valid time reaching the top of the fuel core damage begins around 22:20 forecast pre-damaged reactor pressure vessel around 23:50[/box_dark]

That is the core damage begins around 22:20, including the meltdown of fuel cooling system must be recovered intact, in 23:50 minutes is was not expected to damage the reactor pressure vessel.

If the pressure vessel is damaged, no damage to the outer containment vessel, and yet its thickness is only 3 cm.

From beginning to damage the core, the expected time of 1 hour 30 minutes until the pressure vessel is damaged, if he begins to damage containment, such as one hour later than 3 centimeters thick.

20:30 Preparing to restore lighting in Units 1, 2 and 3 main control rooms; M/C under water; priority for connecting a power-supply truck(s) to Unit 2, waiting for work to begin

21:00 Start of operation of D/D fire pump, preparing to inject (coolant) into the reactor core(s) if the pressure falls

 

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TEPCO Fukushima Daiichi: Emergency Response Room information

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-> Unit 2: (water level) reaching TAF (top of active fuel),

Assessed to occur at approx. 21:40.

Start of damage to reactor core: 22:20 (approx.)

Predicted breaching of RPV: 23:50 (approx.)

-> Now assessing Unit 1

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(ii) Information regarding the leak of radioactive materials

15:12 Monitoring post(s): normal (NISA, 15:12)
Fukushima nuclear plants external appearance: normal (NPA, 15:12)

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(iii) Operational status: Units 1, 2, and 3: automatic shutdown
(Units 4, 5 and 6 currently shut down for regular inspection/maintenance)

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(iv) Damage status / evacuation status (including unconfirmed information)
-> Human casualties: one person injured at operations headquarters (already transferred to hospital)
-> Evacuation status: Fukushima Daiichi personnel currently evacuated

20:50 Fukushima Pref. govt. orders residents within 2km radius of nuclear plants to evacuate

21:53 Prime Minister’s order: “Residents within 3km of Fukushima Daiichi Unit 1 ordered to evacuate.”
-> Property damage: Sloshing in spent fuel pools at Units 1, 2 and 3
Spill from heavy fuel oil tank
Loss of seawater pump function
Fire near Unit 4 heavy fuel oil tank

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II Name of site: TEPCO Fukushima Daini Nuclear Plant (Unit 1)
[End of excerpt. Translator’s note: have omitted rest of this page (P14) of source document]

Source: nanohana.me, via Enformable

Japanese Prime Minister and Cabinet knew of melt through in MARCH

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