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Mayak is primarily plutonium processing facility, unrelated to civilian nuclear program, so it's unfair to link these two. After Chernobyl Russia had pretty good history in terms of nuclear industry safety even though it runs over 200 reactors.
Regarding Gorleben and 2017 Mayal leaks these have been too inflated beyond imagination - I mean the doses released in both were very small and had no biologic impact.