Regarding the installation of the alternative cooling and purification 
system of spent fuel pool of Unit 1-4 of Fukushima Daiichi Nuclear Power 
Station, we compiled the result of analysis concluding that such system 
is effective for stable cooling and that there is no safety issue, and 
reported this to NISA. 
(Previously announced on May 22, June 15, and July 13)

After that, as we partly reviewed the construction schedule after taking 
in account of the actual site condition, we compiled the change and 
reported this to NISA.

The altered context is as attached. 

Appendix: Alteration of report with regards to installation of circulating 
          cooling system of spent fuel pool of Unit 1-4 of Fukushima
          Daiichi Nuclear Power Station (summary) (PDF 130KB)