Astorg had entered exclusive negotiations to buy the unit, Canberra, six months ago as part of Areva’s strategic plan to pay down debt.
The firm’s offer valued Canberra at between €310m and €350m according to Reuters, which cited sources close to the deal in October.
Canberra, which employs more than 1,000 people, had sales of about €250m last year.
It provides nuclear measurement services for personnel safety, facility assessment and safeguarding the public and environment.
Astorg, which has more than €2bn under management, generally targets industrial or service companies.
It claims to have a 30 per cent IRR across 20 exits since it was founded in 1998.
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