On the mechanisms of large amplitude power oscillations in BWRs
Research output: Contribution to book/Conference proceedings/Anthology/Report › Conference contribution › Contributed › peer-review
Contributors
Abstract
BWR stability analysis is a challenge for the nuclear reactor dynamic in-depth analysis. In order to understand the solution manifold of the differential equations describing the stability behavior of a BWR loop in more details we apply coupled codes (nonlinear system codes) and an advanced physical based Reduced Order Model (P-ROM) coupled with a bifurcation code complementary (RAM-ROM approach). In the framework of these investigations we could interpret some system code results in more physical terms. Particular nonlinear solution types with operational safety relevance are stable and unstable limit cycles because in these cases 2-3 stability states coexist and small amplitude oscillations and large amplitude oscillations could occur spontaneously under a control parameter variation. In the paper we demonstrate two (partly) novel local bifurcation analyses results predicting the existence of large amplitude limit cycles. Because of the operational safety relevance of these oscillations and our experience that system code algorithms sometimes predict not the proper oscillation amplitude we recommend to start the BWR stability analysis with a procedure which is suitable to clarify the (possibly complex) stability landscape by local bifurcation analysis and plan on the basis of this knowledge the coupled code runs.
Details
Original language | English |
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Title of host publication | Physics of Reactors 2016, PHYSOR 2016 |
Publisher | American Nuclear Society |
Pages | 4040-4053 |
Number of pages | 14 |
ISBN (electronic) | 9781510825734 |
Publication status | Published - 2016 |
Peer-reviewed | Yes |
Externally published | Yes |
Publication series
Series | Physics of Reactors 2016, PHYSOR 2016: Unifying Theory and Experiments in the 21st Century |
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Volume | 6 |
Conference
Title | Physics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016 |
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Duration | 1 - 5 May 2016 |
City | Sun Valley |
Country | United States of America |
Keywords
ASJC Scopus subject areas
Keywords
- Canard-cycles, Large amplitude power oscillation, Limit point of cycles