In 2013 the gross output generated by the two Almaraz Nuclear Power Plant units was 15,696.5 million kWh, and the net joint production was 15,108.7 million kWh.

Individually, the gross electricity production of Unit I was 7993.9 million kWh, and Unit II 7702.6 million kWh.

Almaraz NPP had a gross accumulated electricity production (from 1 May 1981 to 31 December 2013) of 447,085.6 million kWh (226,001.5 UI and 221,084.2 UII).

The year has involved important and complex activities for Almaraz Nuclear Plant, as each of the units were stopped for refuelling and maintenance at the start and at the end of the year.

The twenty-second refuelling outage for Unit I was completed in January. After coupling to the grid on 10 January, an electrical fault in the alternator excitation system caused two automatic shutdowns, and an unscheduled unit outage was performed as a preventative measure for a comprehensive overhauls of the exciter and voltage regulator, and it was re-connected to the grid on 10 February. The unit experienced another automatic reactor shutdown due to a very low level signal in steam generator SG-3, on 22 February. It was connected to the grid on 24 February and remained coupled and operational at full capacity for the remainder of the year.

On 23 May Unit II experienced an automatic reactor shutdown as a result of the prior stoppage of the turbine caused by the action of an electric generator protection system. After this stoppage, the unit was brought to cold shutdown so that a number of preventive activities could be carried out. After this work, the unit was coupled to the grid on 4 June, and operated at full power for the entire period until decoupled for refuelling on 23 November.

The gross production of Trillo Nuclear Power Plant from 1 January to 31 December 2013 totalled 7.992 million kWh with a net production of 7.487 million kWh during this period.

Since the commencement of operations in 1988 up to the end of 2013, the Plant has generated a total of 205,170 million kilowatt hours electricity, and at 20:10 hours on 22 April the cumulative production milestone of 200,000 million kWh was reached.

2013 had a special meaning for Trillo Nuclear Power Plant: 14 and 22May respectively marked the 25th anniversary of the first criticalityof the reactor and the first coupling to the power grid, and 6 Augustmarked 25 years since the start of commercial operation.

The twenty-fifth outage for refuelling and general maintenance took place between 17 May and 23 June 2013 and during the year there were no automatic reactor stoppages.

In July, there was an outage to check the alternator bearing, and in December it was necessary to reduce reactor power to 0% and to cool the plant to repair an oil leak in the radial bearing of low pressure turbine No. 3.

There were 23 containers with a total of 483 fuel elements in Individual Temporary Storage (ITS) on 31 December 2013.

Safe operation of the plants under any circumstance and situation is the first and most important consideration, in order to ensure adequate protection of plant personnel, the public and the environment. All safety-related actions are performed by authorised personnel, properly trained with the necessary resources, subject to administrative controls, implementing procedures which are approved and monitored. Their knowledge and skills are updated on an ongoing basis as part of the CNAT framework training plan. This plan is intended for internal and external staff, to ensure that everyone involved with the installation has the knowledge and skills required.

During 2013 the installations operated completely normally, without producing any significant incident that affected nuclear safety or radiological protection, employees, or the plant environment.

From the measurements obtained during 2013, the results show that the dose rate of professionally exposed personnel was far below the legal limits established. In the case of Almaraz, the collective staff dose totalled 573.26 mSv per person for the combination of the two units, and at the Trillo Plant, the dose totalled 224 mSv per person, one of the best years for collective doses during the entire history of the installation.

Quality is intrinsic to all activities at CNAT and is the main source of confidence for our owners, the social environment, employees and business partners. The commitment to quality at CNAT has been recognised by the Spanish Association for Standardisation and Certification (Asociación Española de Normalización y Certificación - AENOR) by the award since 1995, of an official certificate attesting compliance of our Quality Management System with the UNE EN ISO 9001 standard for nuclear originated power. The quality certification was renewed in 2013 for total compliance, and runs until 2015.

We also voluntarily submit to international assessments to determine the degree of excellence of the organisation. These include WANO Peer Reviews and in September/October there was a Peer Review at the Trillo plant this year with a satisfactory overall result.

Continuous Improvement is part of the CNAT’s organisational culture and it is for this reason that we manage around 5,000 corrective and improvement actions, revisions and studies each year, based on internal and independent evaluation, as well as those based on self-assessments and internal suggestions by personnel.

Furthermore, in 2013 the various units have identified around 12,000 low-level incidents, with the aim of performing trend analyses and to enable the identification of preventive actions to avoid higher category incidents.