NSD-NRC-97-5491, Forwards Proprietary Revs Re AP600 PCS Pirt/Scaling Closure 970916 Meeting.Encl Completes W Commitment from Subject Meeting.Encl Withheld.Also See 9809300042
| ML20198J247 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 12/18/1997 |
| From: | Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20070L141 | List: |
| References | |
| NSD-NRC-97-5491, NUDOCS 9801140081 | |
| Download: ML20198J247 (4) | |
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NSD-NRC 97-5491 3 Docket No.: 52-003 December 18,1997-
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Document Control Desk O.S. Nuclear Regulatory Cor.' mission ;
i Washington, DC 20555 l
ATTENTION: T. R. QliAY
' SUlljECT: DOCUMENT REVISIONS FROM AP600 PCS PIRT/ SCALING CLOSURE MEETING
Reference:
- 1. Westinghause 1.ctter DCP/NRC1047, date-l T2/97.
Dear Mr. Quay:
'thd attachments to this letter complete the Westinghouse commitment from the September 16,1997, meeting on PCS PIRT and Scaling issues as documented in Reference 1.
Picase contact Bruce Rarig on (412) 374-4358 if you have any questions concerning this submittal. ,
ek n /W i Brian A. McInt:>re, Manager J -
Advanced Plant Safety and Licensing -
jml Enclosure ce: D. C. Scaletti, NRC (w/ Enclosure)
N. J. Liparuto, Westinghouse (w/o Eaclosure) i G -
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'Y ATTACHMENT 1 Markups to WCAP.14326 Rev 1, " Experimental Basis for the AP600 Containment Hr'at and Mass Transfer Correlations" (1.) RAI 480.358: What is the potential significance of the ' dense screens"? ,
Response: NSD-NitC 96-4850, October 17,1996: 'It is assumed that the dense screens were installed to breakup the velocity profile at the entrance of the heated channel. In this i way, both the temperature and velocity profiles would develop simultaneously '
The response is not consistent with Eckert/Diaguila paper. The reference paper statos:
"To assure that the air entered the tube proper with a constant velocity, dense screens were installed at the top and bottom of the tube,'
Neither is addressed in Rev.1.
RESPONSE
The text in WCAP 14326, Rev.1 will be revised to correctly state the purpose of the screens.
(2.) In section 4.4.4 Open Literature Tests, it h stateo that: " Uncertainties in the Hugot(11),
Eckert and Diaguila(6), Siegel and Norris(19), Gilliland and Sherwood(23), and Chun and Seban(7) tests are discussed in the open literature references.'
The staff finds no discussions of the uncertainty in the data in any of the refer .nced papers (except minimally in the Gilliland and Sherwood paper) reviewed (staff has not reviewad the Hugot work). Papers assess coirelations fits to a scatter of data without addressing the significance of the teatter in the data.
RESPONSE
WCAP 14326 will be revised to state that information on uncertainties is limited to what is ;
provioed in the reference papers.
(3.) Section 2.2.1 is based on a three foot wide well? Is this a mistake? If not, then show a plant (SSAR) diagram. If it is really 4.5 feet, how can any conclusion be drawn concerning the competing effects?
RESPONSE
Th3 three foot wide well shown in Figure 2.14 is incorrect. The figure and ar.sociated text will be corrected to 4.5 ft. The competing effects in the annulus'are based on a 6 ft height to the bottom of the balfie (for free convection) and a 2 ft hydraulic diameter for the riser annulus above tile bottom of tne baffle. Thus the effect of the e ror is limited to the figure and does not t *fect the cak:uftlions.
WCAP 14326 Rev. I Markups I
- 4. Reference br analyses are to WCAP 14407 for WGOTHIC code. (e.g., page 3 23)
Were analy. s done with V 4.0 (4.1) or 1.x? Were analyses re-done? Should they be re-done?_ Are thy'cevel' changes significant?
RESPONSE
WGOTHIC version 1.2 was used for the analys6s presented in WCAP 14326, Rev.1.
The analyses were not re-done using WGOTHIC version 4.1. The analyses need not be
- redone since the junction inertia length input values were adjusted in the WGOTHIC version 1.2 calculations to yield cell centered velocities equal to the average of the incoming and exiting junction velocities for each lumped parameter volume in the channel. Consequent'y, the change in subroutine ccvel (from WGOTHIC version 1.2 to version 4.1) was e4ectively :mplernented by the input for these calculations.
(5.) Figure 3.6-2 (pg. 3-47) X axis not labeled (Reynolds Number).
Was correctly labeled in Rev 0,
RESPONSE
WCAP 14320, Rev. I will be revised to add the x-axis label, 'Reynolds Number",
(6.) Page 3-63. L 7i A'?2.4 (not stated if part a or part b). Reference is the original.LST data report, June WP Wst values revised in April 1997 update. If wrong data used, how can any conclurm W own concoming the model selection (smount of conservatism)?
RESPONND Data for LST 222.3 A and B and for LST 222.4 A and B are included in Figure 3.9-5. Note at each elevation there are two tests (222.3-RC064 and 222.4 RC066) and for each test there are two data points (A and B).
WCAP 14326 will be revised to update the reference to the April 1997 LST data report.
The heat transfer, mass transfer, or liquid film data used in WCA P 14326, were consistent with internal errata issued in 1994. The April 1997 revision to WCAP 14135 were redundarit relative to the data used in WCAP 14326.
(7.) Consider error bars on Figure 3.9-4. Consider Section 4.5 method to bound data. How can an assessment of the amount of conservatism be made? May be conservative but not bcunding, cannot " quantify."
RESPONSE
The text discussing the condensation data in WCAP 14326, Section 4.5 will be revised to state that the correlation is conservative rather than bounding.
WCAP 14326 Rev.1 Markups 2
(8.) The values presented in Section 4.5 relating to the application of the condensation test data are not consistent with the information provided in letter NTD-NRC 9570, dated Septernber 28,1995. Also on page 417, third line frorn bottom, word " evaporating" should be 'condensir,g."
RESPONSE: 5
. WCAP 14326, Rev. I supersedes NTD-NRC-9570.
.WCAP 14326 will be revised to change the word " evaporating" to " condensing".
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WCAP 14326 Rev.1 Markups 3
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