Do you believe in unlucky numbers?

At nuclear power plant where a reactor exploded, there were 13 (!) dieselgenerators for emergency cooling system – they all failed 13 – Who chooses to have 13(read: the unlucky number) backup systems?

From NHK world - a diagram showing the Emergency Core Cooling System, which had 13 diesel driven systems to generate electricity for the ECCS

Screenshoot from NHK world – a diagram showing the Emergency Core Cooling System, which had 13 diesel driven systems to generate electricity for the ECCS.

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