Well before the present Fukushima nuclear power plant emergency, the Tokyo-based Citizens Nuclear Information Centre had reported about a history of “cover-ups” in the Japanese nuclear energy industry.
The cover-ups included data falsification during voluntary site inspections and attempts to camouflage damage. “There have been a growing number of damage cover-ups and data falsifications around 1994 when electric companies had started shortening the time for a periodical inspection having learned from the ‘success’ experience in the US,” said the CNIC.
Among the plants included in the report were the Fukushima I plant.
The NISA and the TEPCO published interim reports on September 13 and 17 (2002) respectively, which addressed the 29 suspected cases in more detail. Regarding the cracks detected in the core shroud, according to the report, they had been already found at Fukushima I Unit-1 and Unit-4 in 1993, where the cracks in the middle part of the shroud at Fukushima I Unit-2 in 1994 were reported officially as the first case. The magnitude of the cracks in Fukushima I Unit-2 turned out to be far greater and more serious than the ones announced by the official report. It has also become clear that reactors in Fukushima I Unit 1, 3, and 5 have cracks in each shroud, so the claim that no cracks were found in the core shrouds and that they were replaced as a “preventive measure” is completely false.
See the report on the CNIC website.
You can also see the “accident concealment and data fudge” chart at Fukushima I on the CNIC website.