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Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Wed, 05-02-1992
ERF description: On 31 January during the investigation of a minor event the staff of Trillo NPP detected a design error in the level instrumentation in the annulus outside the containment sphere (between the sphere and the containment building, 3 out of 4 sumps). This error would have affected the actuation of Residual Heat Removal System (RHR) during a small LOCA, in the recirculation phase. Because of the particular design of Trillo (KWU) this deficiency in 3 sumps would have resulted in inadequate safety function of RHR during a small LOCA.
This deficiency has been present since the start-up of the plant. The error has been corrected and the nuclear safety council is investigating the causes and actions of the Trillo staff. The plant is operating at full power.
Press release is attached.
ERF rating date: 04-02-1992
ERF contact person: Mr. J. Gil
ERF address: Justo Dorado 11, Spain
ERF affiliation: Consejo de Seguridad Nuclear

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