Based on the ref below it can be up to 2tons a year. Again this comes from french nuclear plant which I know are very different from US or Japan ones. https:/

Based on the ref below it can be up to 2tons a year. Again this comes from french nuclear plant which I know are very different from US or Japan ones. https://www-boursorama-com.cdn.ampproject.org/c/s/www.boursorama.com/actualite-economique/actualites-amp/gaz-a-effet-de-serre-le-nucleaire-francais-emet-chaque-annee-1-3-a-2-tonnes-de-sf6-soit-l-equivalent-de-30-a-45-000-tonnes-de-co2-26dc6cfcec136b9947ca8c5f3d51397a https://www-boursorama-com.cdn.ampproject.org/c/s/www.bourso...