Masoud Kakouli Varnousfaderani (asker) Jul 9, 2016:

More context The event based AOP, ‘Natural Disaster Accident’, Section IV, Natural Disasters, Chapter 22 [69], specified the post-earthquake actions to be taken and provided instruction for carrying out those actions in response to an earthquake event. This procedure had three levels, based on the intensity seismic activity: 1–10 Gal; 10–45 Gal; and greater than 45 Gal. The seismic event on 11 March 2011 met the criterion for the highest level which, among other things, contained the following instructions: control room status check, responsibilities for performing structure, system and component (SSC) checks and general plant area walk-downs.