Sequential testing procedure12/28/2023 ![]() Regulatory guidelines for ID significance tests and process control tests conducted by licensees with highly enriched uranium are similarly rationalized in definitive hypothesis testing including null and alternative hypotheses statistical efforts of the first, second, third, and fourth kinds and suitable test statistics, uncertainty estimates, prevailing assumptions, and critical values for comparisons. The establishment of appropriate ID detection thresholds depends on a site-specific goal quantity, a more » specified probability of detection and the standard error of the ID. Accordingly, escalating responsive action must be taken to satisfy NRC`s MC and A regulations for low-enriched uranium (LEU) fuel conversion/fabrication plants and LEU enrichment facilities. This paper presents US Nuclear Regulatory Commission (NRC) policy, along with the underlying statistical rationale, for establishing and inspecting the application of thresholds to detect excessive inventory differences (ID). Major fuel cycle facilities in the US private sector are required to respond-at predetermined alarm levels-to various special nuclear material loss estimators in the material control and accounting (MC and A) area. ![]() Output files can be read by graphics, report writer, or other stand-alone utility routines. Input files can be sequentially constructed using local text editors to update existing files. The program can be easily modified to suit particular needs the models for the assumption of multivariate normality for MBs when computing the innovation sequence or the test procedure can be changed as can the input/output format, dimensioning, local error checking, and simulation work. A one-sided page`s test, effective for a wide range of recurring loss scenarios, is applied to the standardized innovation sequence. Nonindependence is treated by converting the MB sequence to the innovation sequence, sometimes called the ITMUF sequence or the sequence of MUF residuals, which are statistically independent and amenable to sequential test procedures. Furthermore, the covariance structure associated with a given more » MB sequence is not known and must be estimated. However, distinct MBs cannot be reasonably treated as statistically independent and may not always be reasonably treated as normally distributed. Here, the term materials balance has a meaning similar to inventory difference and represents a materials loss indicator localized in time and space. This same approach can be applied to materials balance (MB) data. Standard sequential testing procedures are traditionally based on sequences of independent and normally distributed measurements. NRCPAGE is used in safeguards applications to detect a recurring loss of special nuclear material by frequent evaluation (sequential analysis) of accountability data. annual meeting of the Institute of Nuclear Materials Management, Albuquerque, NM, USA, Country of Publication: United States Language: English Subject: 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION FISSIONABLE MATERIALS MATERIAL BALANCE NUCLEAR MATERIALS MANAGEMENT ACCOUNTING MATERIAL UNACCOUNTED FOR DETECTION INVENTORIES LASL MONITORING OPTIMIZATION SIMULATION STORAGE FACILITIES TESTING URANIUM HEXAFLUORIDE URANIUM OXIDES ACTINIDE COMPOUNDS CHALCOGENIDES FLUORIDES FLUORINE COMPOUNDS HALIDES HALOGEN COMPOUNDS MANAGEMENT MATERIALS NATIONAL ORGANIZATIONS OXIDES OXYGEN COMPOUNDS URANIUM COMPOUNDS URANIUM FLUORIDES US AEC US DOE US ERDA US ORGANIZATIONS 055001* - Nuclear Fuels- Safeguards, Inspection, & Accountability- Technical Aspects (United States) Additional Journal Information: Journal Volume: 14:3 Conference: 26. Authors: Goldman, A S Kern, E A Emeigh, C W Publication Date: Tue Jan 01 00:00: Research Org.: Los Alamos National Lab., Los Alamos, NM 87545 OSTI Identifier: 5414368 Report Number(s): CONF-850765- Journal ID: CODEN: NUMMB Resource Type: Conference Journal Name: J.
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