We got Chernobyl because there wasn't transparency. The flaw that caused the explosion was known to the USSR but it was covered up and a correction to existing reactors in production was not implemented until after it became impossible to ignore. The same would be happening to production reactors here in the US if it weren't for the strict government regulations that ensured that no western reactors could be built the way Chernobyl was (no containment building, graphite moderation etc.). This regulation is forcing transparency in design.