SCHEDULED REPLACEMENT OF UX-30 OVERPACKS BY DN-30 OVERPACKS The UX-30 is an overpack that surrounds a 30B cylinder filled with enriched UF6, in order to provide mechanical and thermal protection during the regulation tests. The UX-30 is the subject of an American certificate that expires on 31 December 2024, which was validated by ASN in November 2019 and then again in December 2020. Approvals F/538/AF-96 (w) and F/538/AF-96 (x) issued by ASN expired on 15 November 2022. The Orano NPS company undertook to replace all UF6 shipments with UX-30 overpacks by shipments with DN-30 overpacks, no later than 31 December 2024, as the latter’s design is more recent and has also obtained the required approval certificate. Orano NPS asked ASN for a final validation extension for the UX‑30 packaging approval for an additional two years, to allow a transition between the UX-30 overpack and the DN‑30 overpack, to ensure that a sufficient number of DN-30 can be manufactured. The validity of the two French approvals F/538/AF-96 (w) and F/538/AF-96 (x) was issued on 29 April 2022, with the addition of the following compensatory measures proposed by the licensees and accepted by the authorities of the European countries using the UX‑30 overpack: ■ two 6 kg powder or CO2 extinguishers are positioned on each side of the conveyance; ■ the drivers of the conveyance are trained in firefighting techniques, with training refresher courses at intervals of no more than two years; ■ the tunnels restriction code is B; ■ the conveyance is equipped with a geopositioning device, or a member of the crew is regularly able to communicate their position to the consignor and, as necessary, to the emergency services. The English, Belgian, Dutch and German competent authorities also adopted these compensatory measures in their approval renewal processes. ASN Report on the state of nuclear safety and radiation protection in France in 2022 283 • 09 • Transport of radioactive substances 09 01 07 08 13 AP 04 10 06 12 14 03 05 11 02
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