Revisiting Statistical Aspects of Nuclear Material Accounting
Nuclear material accounting (NMA) is the only safeguards system whose benefits are routinely quantified. Process monitoring (PM) is another safeguards system that is increasingly used, and one challenge is how to quantify its benefit. This paper considers PM in the role of enabling frequent NMA, whi...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
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| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2013/961360 |
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| Summary: | Nuclear material accounting (NMA) is the only safeguards system whose benefits are routinely
quantified. Process monitoring (PM) is another safeguards system that is increasingly
used, and one challenge is how to quantify its benefit. This paper considers PM in the role of
enabling frequent NMA, which is referred to as near-real-time accounting (NRTA).
We quantify NRTA benefits using period-driven and data-driven testing. Period-driven testing
makes a decision to alarm or not at fixed periods. Data-driven testing decides as the data
arrives whether to alarm or continue testing. The difference between period-driven and datad-riven
viewpoints is illustrated by using one-year and two-year periods. For both one-year and
two-year periods, period-driven NMA using once-per-year cumulative material unaccounted for
(CUMUF) testing is compared to more frequent Shewhart and joint sequential cusum testing
using either MUF or standardized, independently transformed MUF (SITMUF) data. We show
that the data-driven viewpoint is appropriate for NRTA and that it can be used to compare
safeguards effectiveness. In addition to providing period-driven and data-driven viewpoints, new features include assessing
the impact of uncertainty in the estimated covariance matrix of the MUF sequence and
the impact of both random and systematic measurement errors. |
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| ISSN: | 1687-6075 1687-6083 |