ML19011A451

Workshop 6 Retrospective PRA 2019-01-22

ML19011A451
Person / Time
Issue date:	01/16/2019
From:	Office of Nuclear Regulatory Research
To:
Nathan Siu 415-0744
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Download: ML19011A451 (4)

Text

Retrospective Analysis Workshop 6 1

Learning Objectives

• Practice with retrospective analysis of events

• Practice with retrospective analysis of conditions 2

Important:

a)

The workshop problems can be performed as group exercises.

b)

The purpose is to exercise the modeling thought process, not to get the right answer.

Problem #1 A severe overnight storm damages power lines feeding the Fenwick 1 NPP switchyard and causes a loss of offsite power.

Describe how you would determine the CCDP for this event.

3

Problem #2 During a 24-hour endurance test of the Fenwick 1 EDG, the EDG tripped due an overheated bearing. Subsequent investigation revealed this was due to an error during maintenance performed 6 months ago. (The lubricating oil was not refilled to the appropriate level.)

Describe how you would determine the CDP associated with this revealed condition.

4