Title: Piping at Fukushima reactor found insufficient to withstand quake
Source: Asahi AJW
Author: EISUKE SASAKI
Date: January 31, 2012
Piping and support structures at the No. 5 reactor of the crippled Fukushima No. 1 nuclear power plant did not have sufficient anti-quake strength under new government standards revised in 2006.
Some of the equipment could have been hit with a force as much as 4.3 times above safety standards if an earthquake of a scale forecast for the plant had struck. [...]
It is unusual for information to be released that shows the possibility of insufficient safety strength in equipment before reinforcement work has been completed.
- Officials of NISA included those results in a draft report that was presented to a meeting of experts on Jan. 30
- Investigations conducted by Tepco and NISA after the Great East Japan Earthquake last March did not uncover clear visible damage
- NISA officials will conduct a more thorough investigation
- Latest information concerns the results of anti-quake calculations for important equipment at the reactor
- Calculations cover some equipment sections that have not been reinforced.
- Calculations showed that a strength of between 1.2 to 4.3 times the anti-quake standards would be applied to the main water supply piping as well as support for seven piping systems if the expected quake under the new standards had struck the reactor
Published: January 31st, 2012 at 6:53 am ET