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During this year's annual refueling outage at the Spanish nuclear power plant Trillo, a new 220-kV standby offsite power system connection was installed. In addition, modifications were made to the previous offsite connection for auxiliary power supply. The functions performed by the new connection were demonstrated successfully through numerous individual tests. An integral test also was performed to verify simultaneous switchover of all four redundant auxiliary power trains from the main offsite power system to the standby system with the reactor at hot standby. The owner of Trillo awarded an order to Framatome ANP to upgrade the plant's standby offsite power system connection for auxiliary power supply. The new 220-kV standby connection would take over the functions performed by the plant's previous 132-kV standby connection. This 132-kV connection would serve in the future as a second standby offsite power system connection. Complex Electrical Modifications Completed The scope of the order covered all of the electrical equipment including the necessary modifications to the safety-related and non-safety-related instrumentation and control (I&C) systems as well as planning for the associated civil work and piping system modifications. The electrical supplies and services included:
Preparations for the upgrade took two years. The actual on-site work was completed within 30 days during the 2002 outage. The project marked the first time that a digital process control system - TELEPERMTM XP from Siemens - was implemented at Trillo. This provides a reference for upgrading other plant systems with digital I&C in the future. The excellent cooperation with the local engineering company EMPRESARIOS AGRUPADOS, S.A. also contributed to the success of the project.
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