Patent ID: 8387559

Claim:
A semiconductor manufacturing plant, wherein at least one fluorine gas generator is connected with at least one semiconductor manufacturing apparatus through a gas supplying system including a storage tank that can store therein a predetermined quantity of fluorine gas generated in the fluorine gas generator, and fluorine gas is supplied from the storage tank, which stores therein a predetermined quantity of fluorine gas, to the semiconductor manufacturing apparatus so as to keep the operation of the semiconductor manufacturing apparatus when the fluorine gas generator is stopped, wherein the gas supplying system comprises an inlet-side gate valve and an outlet-side gate valve respectively provided upstream and downstream of the storage tank; a bypass interconnecting the fluorine gas generator and the semiconductor manufacturing apparatus with bypassing the storage tank; a bypass gate valve provided in the middle of the bypass; and a gate valve controlling unit that controls the respective gate valves, and the gate valve controlling unit performs control to close the bypass gate valve and open the inlet- and outlet-side gate valves so as to supply gas via the storage tank to the semiconductor manufacturing apparatus that requires gas, when the gas supplying system is in a normal operation; and performs control to switch the gas supplying system into a maintenance mode, close the inlet- and outlet-side gate valves, and open the bypass gate valve so as to supply gas from the fluorine gas generator that can supply gas, to the semiconductor manufacturing apparatus that requires gas, with bypassing the storage tank when the gas supplying system is stopped due to maintenance or a breakdown.