Pressure in No.1 reactor drops close to atmosphere, NHK, June 05, 2011:
[...] Pressure inside an operating reactor is normally around 70 atmospheres. But after the disaster, the pressure indicator showed 6 atmospheres in the Number 1 reactor, raising questions about data reliability.
On Friday, the utility replaced the gauge with a new one and made measurements again.
The reading was 1.26 atmospheres as of 11 AM on Saturday, almost equal to normal air pressure. The company says this proves that air inside the reactor is escaping outside. [...]
Published: June 5th, 2011 at 4:11 am ET
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- “Cover over Reactor 1 is only cosmetic” — Built to keep webcam from filming badly damaged building — Has nothing to do with preventing radioactive materials from escaping June 13, 2012
- Increased risk of explosion at No. 1 reactor after drop in pressure and temperature — TEPCO: Risk of explosion “is not high” April 29, 2011
- Japan’s worst-case scenario assumed “significant public exposure” to occur by end of March 12 because of pressure buildup that would damage No. 1 reactor container (VIDEO) May 3, 2011
- Former Fukushima Daiichi Worker: My best guess is explosion had to blow lid off pressure vessel at Reactor 1 August 2, 2012