USE OF THE NUCLEAR MATERIALS IDENTIFICATION SYSTEM (NMIS) FOR ENHANCED RECEIPT CONFIRMATION MEASUREMENTS AT THE OAK RIDGE Y-12 PLANT

摘要

The Nuclear Materials Identification System (NMIS) developed by the Instrumentation andControls Division of the Oak Ridge National Laboratory and the Oak Ridge Y-12 Plant has beenused at the Oak Ridge Y-12 plant to perform enhanced receipts confirmation measurementsproviding mass estimates on low mass HEU metal pieces in shipping containers. For thisapplication, NMIS was used in its active mode with a small Cf source on one side of the shippingcontainer and detectors on the other side. Second order correlation measurements withcalibration standards were utilized to obtain the mass of HEU. This was the first use of NMISfor receipts at the Y-12 Plant. This was a cost-effective method for measuring the mass ofreceipts with as many as 64 items measured in one day. This paper describes the reasons forusing the NMIS for this application. The measurement technique and evaluation of themeasurement data for this application are also described.