ML053220533

E-mail from Don Marksberry to David Loveless Re Palo Verde

ML053220533
Person / Time
Site:	Palo Verde
Issue date:	06/28/2004
From:	Marksberry D NRC/RES/DRAA
To:	David Loveless NRC Region 4
References
FOIA/PA-2004-0307
Download: ML053220533 (1)

Text

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I David Davi Loveless Lovles -. Palo Pa. Verde Ved Paae 1.

Paa 1.1 From: Don Marksberry To: David Loveless Date: Mon, Jun 28, 2004 7:57 AM

Subject:

Palo Verde Here are the revised tables. The results have not been verified. We can do that once we get the info on outstanding questions of key assumptions.

The key issues are:

1. Can offsite power be recovered within 1 hr given the problems with the breakers?

2. What is the success criteria of the GTGs for each unit? What is the default lineup to the power a particular vital bus or does the control room operator pick the bus to power up on the spot?

3. Are the GTG operators available 24/7?

The runs in the second table assume both GTGs are needed for Unit 2. I don't think that a modified GTG tree will make that much of a difference. I have a tree drafted out which considers probabilities of concurrent SBOs in other units. I can add it to the model once you find out the answer to Question 2 and 3.

CC: Michael Cheok

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