Out of phase oscillations have been observed recently in many boiling water reactors during
stability tests and also in start up conditions. Many authors have attempted to explain these …

In the framework of the Paul Scherrer Institute (PSI) transient analysis project STARS, a
boiling water reactor (BWR) stability analysis methodology based on the BWR system code …

In a recent paper by van der Hagen et al.(1994), a novel instability phenomenon, observed
in the Swedish Ringhals 1 BWR, was analysed. The new feature of the instability was that …

In this paper, numerical methods aiming at determining the eigenfunctions, their adjoint and
the corresponding eigenvalues of the two-group neutron diffusion equations representing …

In-phase and out-of-phase instabilities have been observed in BWR reactors. To improve
the safety systems of these reactors, it is necessary to be able to detect in a reliable way …

A model is proposed for the explanation of the space-dependence of the so-called decay
ratio (DR) which is used to quantify the stability properties of boiling water reactors (BWRs) …

This report gives an account of the work performed by the Department of Reactor Physics in
the frame of a research contract with Ringhals, Vattenfall AB. The contract constitutes Stage …

During the last 15 years, the problem of BWR instabilities has attracted the attention of a
number of researchers. In 1996, an unusual instability event occurred at Forsmark-1 in …

A new methodology for the boiling water reactor core stability evaluation from measured
noise signals has been recently developed and adopted at the Paul Scherrer Institut (PSI) …

The concept of eigenvalue separation (ES) was introduced in the past for the
characterisation of the space-time kinetics of reactor transients, and the stability properties of …