Regulatory Guide: Monitoring of Combustible Gases and Vapors in Plutonium Processing and Fuel Fabrication Plants

The U.S. Nuclear Regulatory Commission (NRC) is issuing Revision 1 to Regulatory Guide (RG) 3.7, "Monitoring of Combustible Gases and Vapors in Plutonium Processing and Fuel Fabrication Plants," in which there are minor corrections with no substantive changes in the NRC staff's regulatory positions. RG 3.7 provides guidance with regard to protecting against the possibility of the formation of flammable mixtures with combustible gases and vapors. This guidance is needed to protect against the possibility of the formation of flammable mixtures with these gases and vapors when combustible gases and solvents are used within the confinement barriers of a plutonium processing and fuel fabrication plant.