Sect IV Flashcards
Risk is assessed by identifying credible damage mechanisms, estimating the POFs, assessing the COFs, and
identifying the risk drivers to enable development of effective risk mitigation strategies
RBI is focused on a systematic
determination of relative risk.
absolute risk can be very (2) and often cannot be done with a high degree of accuracy due to too many uncertainties.
time-consuming and costly,
Risk is the combination of the probability of some event occurring during a time period of interest and the consequences
Effective risk assessment should be a rational, logical, structured process that contains at least two key steps:
1) determine how significant the risk is, and
2) determine whether the risk is acceptable.
Key elements that exist in any RBI program include the following:
a) management systems for maintaining documentation, personnel qualifications, data requirements, consistency of
the program, and analysis update.
b) documented method for POF determination.
c) documented method for COF determination.
d) management systems for maintaining documentation, personnel qualifications, data requirements, consistency of
documented methodology for managing risk through inspection, process control, and other mitigation activities
RBI procedure can be applied (3)
qualitatively,
quantitatively,
semi-quantitatively
RBI is a methodology that uses relative risk as a basis for prioritizing and managing the efforts of an inspection
program
qualitatively
Inputs -
Accuracy -
Not______
Inputs - in data ranges instead of discrete values
Accuracy - dependent on background and expertise of the risks analysts and team
Not repeatable
quantitatively,
Model Based where
They are (3)
Easier to (1)
numerical values are calculated and more discrete inputs
systematic, consistent, and documented
Update
. Accuracy
is a function of the analysis methodology, the quality of the data, and consistency of application, while precision is a
function of the selected metrics and computational methods.
Quantitative analysis uses logic models to calculate probabilities and consequences of failure. Logic models used to
characterize materials damage of equipment and to determine the COF can have significant variability and therefore
can introduce error and inaccuracy that impacts the quality of the risk assessment. It is important that results from
these logic models are validated by expert judgment
The accuracy of any type of RBI analysis depends on using a sound methodology, quality data, and qualified
personnel.
RBI process should be the
linkage of risks with appropriate
inspection, process control, or other risk mitigation activities to manage the risks.
linkage of risks with appropriate
inspection, process control, or other risk mitigation activities to manage the risks.
= Inspection plan
