A small amount of radioactive metal particles were escaped from the nuclear fuel building of Ascó's (Spain) first pressurized water reactor (NPP) unit through ventilation ducts and were detected by nearby monitors on 4 April 2008. It is reported that 95% of the particles were deposited close to the point of emission.
A study into the root cause of the incident and its sequence of events has now been concluded. Results of laboratory measurements released today indicate that the total activity of the discharged particles was 0.0023 curies (84.95 MBq).
CSN said that the emission has been insignificant and radiological impact of the release 'remains very low', below the legal dose limit for plant workers. There was no effect, off site. Internal monitoring showed 'no evidence in any case of incorporation of radioactive material'. The incident has been classified at Level 2 on the International Nuclear Event Scale (INES) by the country's nuclear regulator (CSN).
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