ML042960266
| ML042960266 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/08/2004 |
| From: | Buell R Idaho National Engineering & Environmental Lab (INEEL) |
| To: | - No Known Affiliation, Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0307 | |
| Download: ML042960266 (2) | |
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- 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:
lif system(EPS)
- system(AFW)
- AFW-TDP-FR-A then DeleteEvent = AFW-TDP-FR-A; AddEvent = AFW-TDP-FR-TD1HR; Jendif IHPI 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 GEMIGEMDATA 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.
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