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CENTRALES NUCLEARES/NUCLEAR POWER PLANTS FI OBJETIVOS ANUALES / ANNUAL OBJECTIVES PRODUCCIÓN / PRODUCTION (GWh) • ENERGÍA NETA • NET ENERGY • PARADA PARA RECARGA • REFUELING OUTAGE - Error humano 2 sucesos - Fallo equipo 11 sucesos (4 de ellos por vibraciones de turbina) - Modificación/preventivo 2 sucesos En relación con el estado operativo el análisis global indica que han ocurrido: Con la planta en operación 10 sucesos notificables Con la planta en parada o arranque 2 sucesos notificables y los 3 informes especiales) • Incidencias con repercusión en la producción Gwh PROTECCIÓN RADIOLÓGICA RADIOLOGICAL PROTECTION • DOSIS COLECTIVA • COLLECTIVE DOSE RESIDUOS / WASTE • VOLUMEN RESIDUOS BAJA • LOW-LEVEL WASTE VOLUME F II 10.000 9.000 OBJETIVO / OBJECTIVE RESULTADO / RESULT 7.109 GWh 60 días/days 400 mSv x pers 6.822 GWh 70 días/days 373 mSv x pers 400 bidones/drums 323 bidones/drums Las incidencias acaecidas durante el año 99 que han tenido repercusión en la producción, a excepción de las pruebas de válvula de turbina, pueden verse en la figura 7. Adicionalmente a las reducciones de carga provocadas por las pruebas de válvula de turbina, se ha afectado a la producción en las siguientes ocasiones: - Enero: al descubrirse varias penetraciones del edificio ZB provisionalmente selladas mientras se tendían cables para la modificación de corriente alterna, se realizó una prueba que comprobó que se había reducido la estanqueidad del edificio, por lo que en aplicación de las especificaciones técnicas se comenzó inmediatamente una reducción de potencia, que llegó hasta el 40% mientras se sellaban las penetraciones de forma definitiva. - Tras la recarga, se desacopló y enfrió el alternador para verificar la señal de temperatura de dos bobinas PRODUCCIÓN BRUTA / GROSS PRODUCTION 8.000 7643 7.000 6839 6.000 5.000 4.000 3.000 2.000 1.000 FALLO 2 BRR FAILURE 2 BRR 6939 8471 CAMBIO TURBINAS TURBINE REPLACEMENT 7888 8462 7976 8127 8283 INICIO AEOS BEGINNING OF AEOS INSPECCIÓN 3 BRR INSPECTION 3 BRR 0 1989 1990 1991 1992 1993 1994 1995 1996 1997 AÑOS / YEARS MEDIA: 7.719 AVERAGE: 7,719 7015 FALLO ESTATOR STATOR FAILURE 1998 situations that should be suitably supported; the results obtained both in 1998 and 1999 seem to indicate that this is the case, as the good operating situation of the plants has been maintained. I believe that it is essential for the organizations to have the confidence that operating results are sound enough to assume these changes, which undoubtedly must be made, with assurance. This is the situation that will make it possible to improve plant safety and operating margins in the future and to maintain the plants’ economic viability. The first figure shows a comparison between the results obtained and the goals set by the Trillo nuclear power plant for last year. The fundamental qualitative objective of implementing the most relevant modifications resulting from the AEOS program was achieved in spite of having a longer than scheduled outage, which curtailed production. The next factor that affected production was an increase in turbine unit vibrations, which caused several turbine trips and required an overhaul of the thrust bearing, due to the presence of a vibration frequency of the shell-bearing assembly very near operating frequency (50 Hz) and inadequate support. The dose and waste objectives were achieved. ANNUAL RESULTS • Production, load factor and reactor scrams. As shown by Figure 2, production was lower than the historical average due to implementation of the most relevant modifications of the AEOS program. Figure 3 shows evolution of the load factor, which initiated a recovery. The average value (83.1%) is considered as satisfactory if the history of technical incidents is accounted for. During plant startup last year, there was a reactor scram caused by a secondary malfunction, which broke the spell of no scrams that had lasted since 1994. • Radiological protection and waste. Collective radiation exposure was influenced by three of the refueling jobs: 7263 MODIF. AEOS AEOS MODIF. 1999 - Modification of the pressurizer shower lines. - 10-year in-service inspection (including primary hydrostatic test). - Overhaul of a reactor coolant pump. The final result (Figure 4) shows that collective dose levels have been maintained within the range of values of the last 5 years. An important factor was decontamination of the pressurizer lines before proceeding with their disassembly and cutting. The volume of radioactive waste generated (Figure 5) has remained within the values of the last few years, in spite of the fact that pressurizer line modification resulted in an increased waste volume. The new reduction lines (desiccation and incineration) that are being implemented will help us to reduce the volume. In addition, last year we implemented a clearing project of low-level used oils authorized by the MINER in December and the first of its kind in Spain. • Fuel reliability. The good fuel reliability results historically obtained in Trillo have been maintained. A b r i l 2 0 0 0 R e v i s t a S N E
The results obtained in the last inspection and measurement of the oxide layer of Siemens FOCUS type fuel are very satisfactory, as the measured oxide layer maintains approximate values of 50% of the limit, with burn degrees of some 50,000 MWd/Tn. In addition, we are completing a first cycle with 4 ENUSAmanufactured assemblies, which also have not shown any anomalies. F IV 1800 1600 1400 1200 EXPOSICIÓN COLECTIVA / COLLECTIVE EXPOSURE 1696,9 Most Significant Incidents The plant operated throughout the year without any significant safety-related incidents. • Reportable events. Twelve CSN-reportable events occurred and 3 special reports were made during the year, all of them of little relevance. The causes were as follows: Human error ............................. 2 events Equipment failure ....................11 events (4 of them due to turbine vibrations) Modification/preventive m. ..... 2 events As regards operating state, the global analysis indicates that the events occurred: With the plant in operation ..... 10 reportable events With the plant in shutdown or startup ..................................... 2 reportable events and the 3 special reports • Incidents impacting production. Figure 7 shows the incidents that occurred during 1999 that impacted production, except for the turbine valve tests. In addition to the load reductions resulting from the turbine valve tests, production was affected on the following occasions: - January: on discovering that several penetrations of building ZB were provisionally sealed when cables were being laid for alternating current modification, a test was performed that confirmed that the building’s watertightness had decreased. Therefore, pursuant to the technical specifications, a power reduction was begun immediately down to 40% while the penetrations were definitively sealed. - After the refueling, the alternator was disconnected and cooled to verify the temperature signal of two stator coils, which were erroneously giving an alarm signal. The indication was erroneous, and so after verification the equipment was reconnected. - In late April, a turbine trip occurred due to high vibrations in the thrust bearing. - For the same reason, a new trip occurred in mid- July while anchor bolt stress was being examined, with the bad luck that, while the equipment was shut down, the oil pump impeller broke and scattered debris in all the bearings. A week was needed for dismounting, overhauling and cleaning the oil system bearings and for changing the pump. - Insignificant power reductions were required to repair small condenser leaks (June and September) and due to a limitation system board failure (August). - Finally, on December 31, power was reduced to 60% for transition to the year 2000. 1999 Refueling The 1999 refueling plan was conceived to implement design modifications stemming from the mSv - p 1000 800 600 400 200 0 475,1 785,7 1989 1990 1991 1992 1993 1994 1995 1996 del estator, que erróneamente señalaban alarma. La indicación era errónea, por lo que tras la verificación se volvió a acoplar la máquina. - A finales de abril hubo un disparo de turbina por altas vibraciones en el cojinete de empuje. - Por esta misma causa se tuvo un nuevo disparo a mediados de julio, mientras se revisaba la tensión de los pernos de anclaje, con la mala fortuna de que, durante la parada de la máquina, se rompió el rodete de la bomba de aceite de levantamiento arrastrando viruta a todos los cojinetes. Durante una semana se tubo que proceder al desmontaje, revisión y limpieza de dichos cojinetes, del sistema de aceite y al cambio de la bomba. - Reducciones de potencia de poca importancia se produjeron para reparación de pequeñas fugas en el condensador (junio y septiembre) y por fallo una tarjeta del sistema de limitación (agosto). - Finalmente el día 31 de diciembre se redujo potencia hasta el 60% para abordar el transito al año 2000. RECARGA DE 1999 451,8 VALOR ANUAL / ANNUAL VALUE 534,1 El esquema de la recarga de 1999 se concibió para implantar las modificaciones de diseño derivados del Programa AEOS. De entre todas las modificaciones, las más relevantes eran: 324,8 297,7 256,8 301,1 1997 94,23 1998 373 1999 OBJETIVO INPO 2000 / INPO OBJECTIVE - Modificación del sistema eléctrico de CA. - Modificación de la ventilación del edificio de emergencia. - Modificación del sistema de refrigeración de servicios esenciales. - Modificación del sistema de protección del reactor consecuencia de los cambios anteriores. Adicionalmente, se programaron las siguientes actividades relevantes: - Inspección mecanizada de la vasija del reactor. - Finalización del 1 er periodo de inspección, incluyendo prueba hidrostática del primario. - Modificación de las líneas de ducha del presionador. - Inspección de una turbina de BP. - Revisión de una bomba de refrigeración del reactor. - Cambio de rotor del alternador. El hecho de tener que realizar las modificaciones por redundancias (en C.N. Trillo hay 4) y la relevancia de las mismas, al cambiar de ubicación eléctrica más de 500 consumidores, obligó a un detallado programa de pruebas redundancia a redundancia antes de declarar los sistemas operables. Ello hizo que el tiempo previsto de 60 días se deslizase hasta 70 días. Para dar idea del volumen de trabajo, se indican las siguientes cantidades instaladas: - 153.000 m de cable. - 2.500 m de conduit. - 7.000 conexiones de fuerza. - 50.000 puntos de I/C conectados - 550 cambios de ubicación de consumidores. - 17.000 planos de I/C afectados. La mayor dificultad residió en la coordinación de los trabajos eléctricos con los mecánicos y sobre todo con los de instrumentación ya que se tenían interferencias físicas para la realización conjunta de los mismos. A b r i l 2 0 0 0 R e v i s t a S N E
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RIAL EDITORIA Según es ya habitual
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Page 7 and 8: STRUCTURE OF ALMARAZ- TRILLO A.I.E.
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