Interactive graphic

Why the plant went offline

High vibration and other issues degraded tubes in steam generators at San Onofre, which led to a leak of radioactive steam in one generator. Click through to see the three main types of wear.


Tube to retainer bars

Tube to anti-vibration bars

(1/ )

Vibration causes contact between tubes. Most wear was in the U-bend section.

Tubes are moving against stationary retainer bars.

Some anti-vibration bars were too loose to prevent tube movement.


Readers: What’s your take? Share it here.