Risk-Based Allowed Outage Time and Surveillance Test Interval Extensions for Angra 1

Table 3

Modifications on pump probabilities to simulate STI extensions as proposed in Table 1.

System/pumps	Failure to start	Common-cause failure
SIS	𝑄^′FS→3𝑄FS(𝑄1^(2))	𝑄^′CCFS→3𝑄CCFS(𝑄2^(2))
SWS	𝑄^′FS→3𝑄FS(𝑄1^(3))	𝑄^′CCFS→3𝑄CCFS(𝑄3^(3))
AFWS	𝑄^′FS→3𝑄FS(𝑄1^(2))	𝑄^′CCFS→3𝑄CCFS(𝑄2^(2))

𝑄^′_𝑥 stands for pump probabilities for the extended time period.