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View document| NKS Programme Area: | NKS-R | | Research Area: | Severe accidents and Reactor Physics | | Report Number: | NKS-97-FR2-RAK-2 | | Report Title: | Safety against Releases in Severe Accidents | | Activity Acronym: | RAK-2 | | Authors: | I. Lindholm, Ø. Berg, E. Nonbøl | | Abstract: | The workscope of the RAK-2 project has involved research on quantification of
the effects of selected severe accident phenomena for Nordic nuclear power plants,
development and testing of a computerised accident management support system
and data collection and description of various mobile reactors and of different reactor
types existing in the UK.
The investigations of severe accident phenomena focused mainly on in-vessel melt
progression, covering a numerical assessment of coolability of a degraded BWR
core, the possibility and consequences of a BWR reactor to become critical during
reflooding and the core melt behaviour in the reactor vessel lower plenum. Simulant
experiments were carried out to investigate lower head hole ablation induced
by debris discharge. In addition to the in-vessel phenomena, a limited study on
containment response to high pressure melt ejection in a BWR and a comparative
study on fission product source term behaviour in a Swedish PWR were performed.
An existing computerised accident management support system (CAMS) was further
developed in the area of tracking and predictive simulation, signal validation,
state identification and user interface. The first version of a probabilistic safety
analysis module was developed and implemented in the system. CAMS was tested
in practice with Barsebäck data in a safety exercise with the Swedish nuclear
authority.
The descriptions of the key features of British reactor types, AGR, Magnox, FBR
and PWR were published as data reports. Separate reports were issued also on accidents
in nuclear ships and on description of key features of satellite reactors. The
collected data were implemented in a common Nordic database. | | Publication date: | 01 Dec 1997 | | ISBN: | ISBN: 87-7893-022-7 | | Number of downloads: | 1771 | | Download: |  NKS-97-FR2-RAK-2.pdf |
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