ML20248F697
| ML20248F697 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, McGuire, 05000000 |
| Issue date: | 04/03/1989 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-83-11, NUDOCS 8904130157 | |
| Download: ML20248F697 (2) | |
Text
II.
l y
J.
' Duke Evwer Company Hu & kker
PO Box 33198 Vice President Charlotte, N C 28242 Nuclear Production (TO4)373 4531 '
DUKEPOWER April 3, 1989 U. S. Nuclear Regulatory Commission Washington, DC 20555 Attention: Document Control Desk
Subject:
McGuire Nuclear Station Docket Numbers 50-369, and -370 Catawba Nuclear Station Docket Numbers 50-413 and -414 Topical Rgert~DPC-NE-3000,
" Thermal-Hydraul1c Transient Analysis Methodology" By letter dated September 29, 1987, I submitted for NRC review the topical report DPC-NE-3000, " Thermal-Hydraulic Transient Analysis Methodology."
This report was submitted in response to Generic Letter 83-11, " Licensee Qualification for Performing Safety Analyses in Support of _ Licensing Actions." During an initial telecon on March 16, 1989, and during followup discussions, the reviewer raised several questions regarding the content of this report and how it interfaced with other Duke topical
-reports currently under NRC review. The purpose of this letter is to respond to these questions and to outline a proposed revision to DPC-NE-3000.
l The reviewer has correctly identified apparent inconsistencies in the area of Oconee core thermal-hydraulic model development using the VIPRE-01 code. The steady-state core reload design VIPRE-01 models are detailed in the Duke topical report DPC-NE-2003, which is currently under NRC review.
The causes for the apparent inconsistencies are twofold.
First, an evolution in modeling has occurred since the September 1987 submittal of DPC-NE-3000. The second cause is that the DNBR calculations associated with FSAR Chapter 15 transient analyses, which are the focus of DPC-NE-3000, require different and more flexible models thar are required for steady-state core reload design.
Duke proposes to subr i a revised Section 2.3 of DPC-NE-3000 which converges technically witt OPC-NE-2003, and. focuses on modeling differences and the bases for those differences.
This should provide sufficient clarification and improve the review process.
The reviewer stated that Section 6.0 of DPC-NE-3000 would not be reviewed, since it was considered to be beyond the scope of Generic Letter 83-11.
It was agreed that this section could be either deleted or included in the i
finsi version at Duke's discretion. This section and all references to it l
will be deleted in the final version.
l
\\
W n
$884228a87<8888$p
[\\
P 4
Document Control Desk April 3, 1989 i
Page Two We request that a new Section 3.3 entitled "McGuire/ Catawba VIPRE Model" I
be reviewed as part of the proposed revision. This section will have the same purpose as the existing Section 2.3, except that it will be applicable to the Duke Westinghouse units. This new Section 3.3 will similarly focus on the differences in modeling and the associated bases when compared to the Duke topical DPC-NE-2004. However, no validation r"sults will be submitted with the new Section 3.3, and therefore it will be brief.
Duke VIPRE validation for McGuire and Catawba has been submitted in DPC-NE-2004.
As discussed on March 16, 1989, we intend to submit the revisions to DPC-NE-3000 in approximately 30 days.
Feedback on the proposed revision I
is. requested in order to ensure that the concerns that have been raised will be addressed in the revision to DPC-NE-3000.
You may call Scott Gewehr (704/373-7581) or Gregg Swindlehurst (704/373-5176) with your comments.
Very truly yours, i
n Hal B. Tucker SAG /159/td 4
cc: Mr. Darl Hood Office of Nuclear Reactor Reg.
U. S. Nuclear Regulatory Comm.
Washington, DC 20555 Mr. K. Jabbour Office of Nuclear Reactor Reg.
U. S. Nuclear Regulatory Comm.
Washington, DC 20555 Mr. W. T. Orders Senior Resident Inspector Catawba Nuclear Station Mr. P. K. VanDoorn Senior Resident inspector McGuire Nuclear Station I
i