The purchaser may award a contract without prior advertising or competitive tendering where the conditions for awarding the contract are not compatible with the minimum periods of urgency provided for in articles R. 2361-2 and R. 2361-6 in the restricted invitation to tender procedure or in article R. 2361-8 in the procedure with negotiation, and the purpose of which is strictly limited to the measures necessary to deal with a pressing emergency resulting from unforeseeable and external circumstances, in particular technological or natural disasters.
Where the pressing urgency is incompatible with the preparation of the consultation documents, the award of the contract shall at least be the subject of an exchange of letters.