The CIAU (Code with Capability of Internal Assessment of Uncertainty) was developed at University of Pisa and constituted the follow-up of a request from the international community issued on the occasion of an ad-hoc Workshop called by US NRC and OECD/NEA in Annapolis (1996). The CIAU methodology incorporated all the features of the UMAE (Uncertainty Method based on Accuracy Extrapolation) where, among the other things, automatization was added, as well as the possibility to use accuracy values derived from SETF (Separate Effect Test Facility) experiments in addition to ITF (Integral Test Facility) experiments (as in the UMAE). The CIAU allowed an automatic (simultaneous to the output of a calculation) derivation of uncertainty bands which characterize the time trends of selected code output variables. Hypercube quantity errors and Vector time errors are distinguished in CIAU and recombined to estimate the code uncertainty. The CIAU was used in the framework of a variety of application to demonstrate the safety of existing Nuclear Power Plants (NPP) – noticeably, licensing process – as well as the training of specialists. The present document deals with a sample application performed in Pisa by a Brazilian scientist in the framework of a cooperation funded by IAEA (International Atomic Energy Agency).
Bases for the use of CIAU for a Nuclear Power Plant (NPP) transient simulation
D’Auria F.
Ultimo
Conceptualization
1999-01-01
Abstract
The CIAU (Code with Capability of Internal Assessment of Uncertainty) was developed at University of Pisa and constituted the follow-up of a request from the international community issued on the occasion of an ad-hoc Workshop called by US NRC and OECD/NEA in Annapolis (1996). The CIAU methodology incorporated all the features of the UMAE (Uncertainty Method based on Accuracy Extrapolation) where, among the other things, automatization was added, as well as the possibility to use accuracy values derived from SETF (Separate Effect Test Facility) experiments in addition to ITF (Integral Test Facility) experiments (as in the UMAE). The CIAU allowed an automatic (simultaneous to the output of a calculation) derivation of uncertainty bands which characterize the time trends of selected code output variables. Hypercube quantity errors and Vector time errors are distinguished in CIAU and recombined to estimate the code uncertainty. The CIAU was used in the framework of a variety of application to demonstrate the safety of existing Nuclear Power Plants (NPP) – noticeably, licensing process – as well as the training of specialists. The present document deals with a sample application performed in Pisa by a Brazilian scientist in the framework of a cooperation funded by IAEA (International Atomic Energy Agency).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
