I have
identical nodes, and
every
are affected.
High Medium Low

Class

Value

Symbol

High

Once in 5 years.

For 100 identical components, each month 1 or 2 will experience an incident.
H

Medium

Once in 50 years.

For 100 identical components, each year 2 will experience an incident.
M

Low

Once in 500 years.

For 100 identical components, one incident will occur every five years.
L

Extremely high

Routine event. Very often.
V

Extremely low

Very rare, but not physically impossible.
U

Ambiguous

Indicates lack of consensus between analysts.
A

Unknown

Indicates lack of knowledge or data.
X

Not yet analysed

Default. Indicates that no assessment has been done yet.
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