ML042960447

E-mail from Robert F Buell to Don Marksberry, Subject: Palo Verde Model

ML042960447
Person / Time
Site:	Palo Verde
Issue date:	06/29/2004
From:	Buell R Idaho National Engineering & Environmental Lab (INEEL)
To:	Marksberry D Office of Nuclear Reactor Regulation
References
FOIA/PA-2004-0307
Download: ML042960447 (2)

Text

L'-via Loveiess - t-aio verce mooei ry From: <BUELRFiinel.gov>

To: <DGM2@nrc.gov> -1JUT nllI Date: Tue, Jun 29, 2004 8:21 PM

Subject:

Palo Verde Model Don, I looked into the issues that you broached concerning the Palo Verde model and have the following fixes/comments:

Project rule not being used - It does not directly impact your results and especially since you are setting a two hour mission. Either delete this rule or comment it out it out by placing a "I" in front of each line as follows:

if system(EPS)

• system(AFW)

• AFW-TDP-FR-A then I DeleteEvent = AFW-TDP-FR-A;

[AddEvent = AFW-TDP-FR-TD1 HR; Jendif HPI failure events missing from SBO sequence #11 - This was indeed an error in the model. A flag was inadvertently omitted from the tops of several fault trees in the SBO logic. This flag (FLAG-SYS-LOOP) should be added to the tops of the HPI, COOLDOWN, SDC, CSR and, HPR fault trees.

-Multiple power recovery events in a given cutset - The presence of two power recovery events in a single cutset in the model results is OK. As you noted, these are in fact conditional events. However, I went back and recalculated all of the power recovery events as well as reviewed the GEM1GEMDATA configurations. I did find an error in the GEMDATA configuration that does impact the value of the power recovery events.

The updated GEMDATA configuration yields the following recovery values (OEP-XHE-NOREC-BD - 2.080E-001, OEP-XHE-NOREC-SL - 4.460E-001, OEP-XHE-NOREC-ST - 3.OOOE-001, RCS-MDP-LK-SEALS - 3.990E-2). In addition to changing these values, the updated GEMDATA.GDF file will have to be imported into the GEMDATA program.

I have attached two models with these fixes in them. The first (PVNG_.,304) is the current model off the SAGAN server. The second model (PVNG-304_DAVE2) has the gas turbine alignment restrictions that I added for Dave Loveless. If you have a significant number of modifications to the model that you are working with and don't feel like incorporating these changes or starting with one of the updated models you can ZIP it up and send it to me and I can incorporate these changes into your model in a few minutes. Note, I will be out of the office tomorrow morning until lunch time. Also, I have changed the file extensions to *.abc to get past your email filters. You will need to change them back to *zip.

Thanks, Robert Buell

/io;

i(-avIa Loveless - -aio veroe Moael - age z Idaho National Engineering and Environmental Laboratory Bechtel BWXT Idaho, LLC P.O. Box 1625 Idaho Falls, ID 83415-3850 Phone: 208-526-9400 FAX: 208-526-2930 (See attached file: PVNG_304.abc)(See attached file: PVNG_304_DAVE2.abc)

CC: <GMD~nrc.gov>, <DPL~nrc.gov>