RD 1254/1999 was implemented by Decret 174/2001, which was drawn up by the Regional Government of Catalonia and regulates the application of the Spanish legislation in the region. Since then, the Catalan government has drawn up a series of instructions through suitable relevant bodies. The aim is not only to regulate establishments affected by the major accident legislation, but also to carry out suitable planning in relation to these facilities. The following instructions are of particular interest and they were published by the Catalan government’s Secretary of Industry and Energy: Instrucció 8/2007 SIE, Instrucció 9/2007 SIE, Instrucció 14/2008 SIE, Instrucció 7/2009 SIE and Instrucció 11/2010 SIE.