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Complete, detailed and
structured event tree and fault tree model
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Full set of initiators
(LOCA, Transients, External and Area Events, Common Cause Initiators
(CCIs))
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Full set of operating
states (Power operation, start-up, outage and shutdown)
- Containment analysis
- Phenomena
investigation and assessment
- Level 1 to level 2
interface
- Plant damage states,
containment event trees and release categories
- Release calculations
- Screening analysis
assuming that equipment exposed to fire/flooding has failed with the
probability of 1.0
- Detailed analysis
taking into account component possibility to survive, hazard detection
and mitigation
- Full dependency
information used as input
Living PSA (LPSA) models allow instantaneous risk
calculations based on the actual plant status and configuration. RELCON
has the methods and procedures for the whole LPSA model development
process. We also have the tools and procedures for efficient creation of
LPSA models.
The LPSA model can be used in a number of LPSA
applications:
- Risk Follow-up
- calculation of the actual risk at each moment when looking back (all
known component states are taken into account). Risk follow-up is used
to identify situations that have had a large impact on the risk and to
provide guidance on safety improvement measures.
- Risk Monitoring
- calculation of the risk in real time, on-line. The risk monitor application
(RiskSpectrum
RiskWatcher) support operators, maintenance and planning staff.
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Surveillance
Test Interval Optimisation
- the instantaneous risk model is used to optimise surveillance test
intervals with regard to:
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Maximum safety level with a given
number of tests
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Minimum number of tests for a
given safety level
- Allowed Outage
Times - the LPSA model is used to optimise AOT's. The risk for
remaining at power operation is assessed and compared to the risk of
shutting down.
- Preventive
Maintenance - the preventive maintenance analysis is carried out in
order to find:
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Which measures, e.g.
tests, are most effective for keeping a high safety level during
preventive maintenance.
- Which
actions should not be carried out during the preventive
maintenance, e.g. shifting of pumps.
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