RiskSpectrum RiskWatcher

Real time insights, ensuring safe and reliable operations

RiskWatcher offers instant access to projected and real time insights ensuring safe and reliable operations, providing peace of mind, and empowering you to run your business with confidence. 

RiskWatcher Risk Monitor is used for monitoring online risk, simulating different scenarios and planning outages in nuclear power plants, as well as for evaluating risk exposure at offshore oil & gas installations. 

RiskWatcher Trip Monitor is a tool for monitoring the risk for causing a "trip" of a nuclear reactor and for identifying equipment critical to trip. A reactor trip is the terminology used for the risk of an automatic shut-down of a nuclear power plant.

RiskWatcher is optimised to work with PSA models created using RiskSpectrum PSA.


Software In Action


Qualitative and Quantitative Results

The Operators screen can be adjusted to show  from 1 to 8 different windows of information. 

Typically, windows showing the quantitative results up to now and for the planned upcoming events is of importance. 

Qualitative results showing compliance with operating conditions or system availability gives the user a clear picture of what systems or safety functions that are available or not. 

Qualitative Results in RiskWatcher

Qualitative results showing compliance with operating conditions or system availability gives the user a clear picture of what systems or safety functions that are available or not. 

In the picture to the right you can see that the Emergency Core Cooling system has the colour red. Depending on how this system has been modelled, based on technical specification requirement or based on availability, it is considered to be in breaach of conditions for operation. 

The blue arrow indicates where the program also display relevant information based on this current situation and also include a link to documents that are attached, blue circle. 

Quantitative Results

The logical models in RiskSpectrum PSA are used for quantifying the frequencies and probabilities of unwanted events in RiskWatcher. These are typically catastrophic events such as core damage at a nuclear power plant, explosion in a chemical plant, oil rig or refinary. 

Frequencies and probabilities

The upper right picture shows the frequency of core damage as a function of time in the middle window and in a bar diagam in the right window showing the risk level at the current time point. Two other frequencies monitored are also shown here. 

The colour bands typically indicate at what level actions are needed. Green represents an acceptable risk level, yeallow an increased risk where certain measure should be taken to mitigate the risk. The orange colour band represents a level of risk that cannot be entered volontarily and the red calls for immediate shut down the plant. 

Importance Measures

The RiskWatcher interface offers also two  quantitative importance measures that helps you reduce risk and anticipate and prevent events leading to non-compliant operation. This is shown in the lower picture on the right. 

The Risk Increase Factor is calculated for equipment. The factor gives you an indication of how much the risk would increase if that equipment was found to be or was made unavailable.

The Restoration Worth Factor gives an indication of how much the risk would decrease if equipment that is unavailable was restored to service. 

RiskSpectrum Analysis Tool

RiskWatcher uses the same very competent PSA solution engine as RiskSpectrum PSA -  RiskSpectrum Analysis Tool (RSAT)

RSAT is renowned for its ability to solve very large and complex Fault Tree and Event Tree models. For RiskWatcher, it converts the fault tree and event tree logical structures to a Minimal Cut Set (MCS) list and quantifies the top frequency or probability and importance measures used in RiskWatcher.

Every plant operating mode, configuration with its equipment availability and when standby components where last tested is considered and included in the quantifications of risk in RiskWatcher.  

Every new configuration is re-quantified thereby ensuring no unnecessary truncation is made

What-If Analysis

How will taking out certain equipment from service affect the current risk level? 

RiskWatcher offers quick evaluation of hypothetical scenarios that the user can evaluate without adding records to the plant log. 

How does, for example, taking out a standby emergency diesel generator affect the quantitative and qualitative risk levels?


RiskWatcher Trip Monitor

The RiskWatcher trip monitor allows operators to:

  • Assess the online risk of reactor or turbine trip (loss of production).
  • Assess the offline (planning) risk of reactor or turbine trip (for assessment of maintenance and test activities).
  • Identify the critical components, or so-call Single Point Vonerability (SPV), whose single failure will lead to reactor or turbine trip
  • Evaluate qualitatively the status of key system/function
  • Manage and follow-up frequency of risk for trip
  • Assess equipment importance based on current configuration