Statistical Evaluation Process of Material Unaccounted for and It's Application to Bulk Handling Facility

• Activity Number: 185
• Type: Contributed
• Date/Time: Monday, August 5, 2013 : 10:30 AM to 12:20 PM
• Sponsor: Korean International Statistical Society
• Author(s): Min-Su KIM*+ and Hyewon Shim and Seung Ho Ahn and Ki Hyun KIM and Seong Yeon JO
• Companies: Korea Institute of Nuclear Nonproliferation and Control and Korea Institute of Nuclear Nonproliferation and Control and Korea Institute of Nuclear Nonproliferation and Control and Korea Institute of Nuclear Nonproliferation and Control and Korea Institute of Nuclear Nonproliferation and Control
• Keywords: material unaccounted for ; evaluation ; measurement uncertainty

Abstract

Material unaccounted for (MUF) means the difference between the book inventory and the physical inventory. For bulk material handling facility, a nonzero MUF is expected because of measurement uncertainty used to determine the amounts of material. This observed MUF is an index of material control performance and used to identify the possibility of material diversion. International Atomic Energy Agency (IAEA) performs statistical evaluation of an observed MUF during material balance period to judge the significance of MUF. Therefore, State and facility need to establish its evaluation process of MUF to improve the performance of material control and to satisfy the IAEA criteria related to MUF. In this study, statistical evaluation process including measurement uncertainty estimation, sigma MUF calculation and hypothesis test to judge the significance of MUF was introduced based on the IAEA material balance evaluation. In addition, evaluation process was applied to nuclear fuel fabrication plant. Uranium MUF during 2011~2012 period were evaluated. As a result of evaluation, positive conclusion that the quantity of MUF is not statistically significant was drawn.