PRA

Question 1

Risk Function

Answer 1

A designator for a train of equipment used to describing RICTCal or RAsCal maintenance states, such as “EWA” for ECW Train A or “IA11/12” for Instrument Air compressor 11 or 21.

Question 2

Maintenance State

Answer 2

A combination of one or more Risk Functions, such as “EWA IA11/12 CCA” or “CW11/12”, used to describe the current plant configuration

Question 3

ICDP

ITP

Answer 3

Incremental Core Damage Probability

(Work Week Core Damage Risk)

Incremental Trip Probability

(Work Week Trip Risk)

Question 4

Carryover Risk

Answer 4

Incremental risk (ICDP or ITP) which accrues due to maintenance in a given work week which began in a previous week.

Automatically handled in RAsCal and is displayed on the Entry tab. NOT shown in RICTCal because it is not possible to close a sequence with inoperable equipment.