Soundness Verification of Unit 4 Reactor Building at Fukushima Daiichi Nuclear Power Station - May 16, 2012

Tokyo Electric Power Company (TEPCO) - May 16, 2012

1. Purpose of Soundness Inspection

In response to the concern that Unit 4 spent fuel pool may collapse,
we have provided the explanations below to prove its soundness.
We will continue our regular inspection 4 times a year to ensure
soundness until the fuel is removed.

• 1. We have confirmed that the building has not tilted by measuring the distance
  between the water surface of the spent fuel pool and the floor surface of the
  building.

• 2. Our analysis result shows that the reactor building including the spent fuel
  pool will not collapse even if an earthquake equivalent to the Tohoku-Pacific
  Ocean Earthquake (seismic intensity 6) occurs in the area.

• 3. The seismic safety margin has improved by more than 20% by reinforcing
  the bottom of the spent fuel pool.

• 4. Regular inspection (4 times a year) is done to confirm the soundness of the
  reactor building and the spent fuel pool.

(READ COMPLETE REPORT - 9 page.PDF file)