Regarding Fukushima Daiichi Nuclear Power Station Unit 1, taking into
account the possibility of hydrogen accumulating inside, we have been
considering encapsulation of hydrogen by injecting nitrogen to the
reactor containment vessel.
Today, we received an order from minister of economy, trade and industry
to report on matter such as necessity of encapsulating nitrogen, method
for implementation, and impact assessment of safety. Accordingly, we have
compiled related matters and reported to minister of economy, trade and
industry today. The report was approved after the deliberation in the
Ministry of Economy, Trade and Industry.
Base on the report, we will begin injecting nitrogen to the reactor
containment vessel of Unit 1 today, around 10:30pm.
Appendix1: Necessity for injecting nitrogen(PDF 11.1KB)
Appendix2: Schematic Diagram Regarding Injection of Nitrogen Gas
into the PCV(PDF 17.9KB)