ML030850240

E-mail M. Leisure, First Energy, to D. Pickett, NRR, Fwd: Verifying Some Davis Besse PRA Information

ML030850240
Person / Time
Site:	Davis Besse
Issue date:	03/29/2002
From:	Leisure M FirstEnergy Corp
To:	Pickett D, Sands S Office of Nuclear Reactor Regulation
References
FOIA/PA-2003-0018
Download: ML030850240 (3)

Text

I Steven biooni - Re. Fwd: Verifying Some Davis Besse PRA Info -.76 Paae1 From: <mkleisure@firstenergycorp.com> " - 1-'-e--C To: <dvpl@nrc.gov>, <spsl@nrc.gov>, <sml@nrc.gov> D C*., 6V2-(

Date: Fri, Mar 29, 2002 12:26 PM "--' 5,^

e-2.

Subject:

Re: Fwd. Verifying Some Davis Besse PRA Info Gentlemen:

A response to Steve Long's questions is forwarded.

Mike Leisure Davis-Besse Licensing (419)321-7168

_- Forwarded by Michael K. Leisure/TE/FirstEnergy on 03129/02 12.24 PM Kendall W.

Byrd To: Michael K Leisure/TE/FirstEnergy@FirstEnergy 03/29/02 11:08 cc:

AM Subject Re: Fwd: Verifying Some Davis Besse PRA Info(Document link: Michael K Leisure)

Mike, The following are the results from the most current revision to our PSA

1. LOCA Definitions Large LOCA > .5 ft2 Medium LOCA .02 - 0.5 ft2 Small LOCA < 0.02 ft2 2 LOCA Conditional Core Damage Probabilities Large LOCA - 8.OE-3 Medium LOCA - 5.7E-3 Small LOCA- 1.1E-3 3 Inside Diameter of Hot Leg - 36 in Michael K.

Leisure To: Kendall W.

Byrd/TE/FirstEnergy@FirstEnergy 03/28/02 cc- Dale R. WuokkofTE/FirstEnergy@FirstEnergy

I Steven Blooni - Re. Fwd: Verifying Some Davis Besse PRA Info PAIfoPg Page 2 StvnBioi-Re w:Veiyn SoeDvi es 09 42 AM Subject Fwd Verifying Some Davis Besse PRA Info Ken Can you help with this? Steve Long is involved in the Nozzle issue.

Mike

-- Forwarded by Michael K Leisure/TE/FirstEnergy on 03/28/02 09 38 AM "Douglas Pickett" To: <Daler._wuokko@firstenergycorp.com>,

<DVP1 @nrc.gov <Michaelk.Ileisure@firstenergycorp.com>

> cc: "Steven Long" <SML@nrc gov>, "Stephen Sands" <SPSl@nrc.gov>

03/28/02 Subject Fwd- Verifying Some Davis Besse PRA 09.24 AM Info Dale/Mike Steve Long of the PRA group has requested the attached information. Could you please send your response back through Stephen Sands and myself.

Thanks Doug Content-Transfer-Encoding: quoted-printable Date: Thu, 28 Mar 2002 08:5513 -0500 From: "Steven Long" <SML@nrc.gov>

To: "Douglas Pickett" <DVP1@nrc.gov>

Subject Verifying Some Davis Besse PRA Info Mime-Version 1.0 Content-Type. text/plain; charset=US-ASCII Content-Disposition: inline Doug, We need to verify some PRA info we have been using from the Davis Besse IPE submittal dated February, 1993.

Specifly we need.

1. Current defintions for the break size defintions for small, medium and large LOCAs.

2. Current values of conditional core damage probabilities for small, medium and large LOCAs. (These should be the current PRA values; we are not requesting values specific to upper-head break locations.)

Steven Bloom - Re Fwd. Verifying Some Davis Besse PRA Info Page 3 3 Inside diameter of hot-leg pipe.

Thanks for the help.

Steve CC: <drwuokko@firstenergycorp com>