ML031110325

E-mail from M. Kirk to S. Long, Regarding DB Cavity Growth Analysis - Preliminary Results

ML031110325
Person / Time
Site:	Davis Besse
Issue date:	07/26/2002
From:	Matthew Kirk Office of Nuclear Regulatory Research
To:	Long S Office of Nuclear Reactor Regulation
References
FOIA/PA-2003-0018
Download: ML031110325 (1)

Text

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Pg Page I From: Mark Kirk IC-z!FS To: Steven Long ,l'j/l-e7-~

Date: 7/26/02 2:43PM

Subject:

DB Cavity Growth Analysis - Preliminary Results Steve -

We just today received some results from ORNL that we are in the process of checking I reviewing ... i hope to have something out to you on this by Wednesday or Thursday of next week. In our latest analysis we have the following:

For a model with a uniform cladding thickness of 0.24-in. (the minimum measurement reported for the DB cladding by the licensee) we have a FE model that has an exposed cladding area of 130 sq. in. This area is 3.7 times larger than our estimate of the "las found' area, which is35 sq. in. At this area of exposed cladding (which, by the way, engulfs half of nozzle 11) we get an estimated instability pressure of 3330 psi.

This pressure is still substantially above the operating pressure of 2165 psi, especially when you consider that in our investigation of the "as found" geometry we determined that the instability pressures we predict using FEA are typically 8-9% below those measured experimentally.

As i mentioned earlier, we hope to have a more comprehensive set of results to share with you by mid to late next week.

Mark

>>> Steven Long 07/23/02 03:1 6PM>>>>

Any news from ORNL on how the cavity failue isze itertions ar coming?

CC: Bass, Richard - ORNL; Deborah Jackson; Edwin Hackett; Mark Kirk; Nilesh Chokshi; Wallace Norris; William Cullen; Williams, Paul - ORNL