Fukushima Daiichi NPS Prompt Report 2013

Today (on November 19), we found that a valve in a supply line did not open when conducting a manual starting test with a standby emergency nitrogen gas separation apparatus.

At 11:54 AM today, based on this, we determined that we could not meet the restriction of the operation settled in the security of the specified reactor facilities Part 1, Article 25, 'One nitrogen separation apparatus is in operation and an emergent nitrogen gas separation apparatus (including a diesel power generator for emergent nitrogen gas separation apparatuses) is ready to start.'

Currently, nitrogen is supplied to the primary containment vessel via two nitrogen gas separation apparatuses (A and B) in common use, and no abnormality in plant data (hydrogen density and temperature inside the primary containment vessel etc.), or no significant change in indicated values of monitoring post has been found so far.

We will investigate a cause etc. later.