ML20215M663
| ML20215M663 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 04/28/1987 |
| From: | Kuo P Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20215M198 | List: |
| References | |
| NUDOCS 8705140081 | |
| Download: ML20215M663 (4) | |
Text
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ENCLOSURE 3
[
o UNITED STATES
~g NUCLEAR REGULATORY COMMISSION f
g WASHINGTON, D. C. 20555 g
j
/
April 28, 1987
....+
NOTE T0:
Files i
FROM:
P. T. Kuo, Section Chief Mechanical Engineering Branch Division of Engineering and System Technology
SUBJECT:
SUMMARY
OF AUDIT HELD ON 4/14/87 IN NEW YORK TO CLARIFY LOADING CONSTRUCTION ANALYSES AND RESULTS PRESENTED CONFIRMATORY ANALYSES FINAL REPORT An audit was held at the EBASCO offices in New York on April 14, 1987 to review calculational results as well as the approach proposed by LP&L/EBASCO to address the concerns raised previously at the conference of March 30, 1987.
A list of attendees is provided in Attachment 1.
During the meeting, EBASCO presented some preliminary results in which they combined the results available from the operational and seismic load cases with construction sequence loads.
EBASCO showed that, if the calculated construction sequence moments were added to the other bending moments, then rebar stresses in small regions of the mat, primarily under the containment wall, would exceed yield.
This procedure was pointed out by the licensee to be a conservative one since the operational loading would tend to reduce the effect of the construction sequence loading.-
Specifically, this is due to the non-linear moment-curvature relationship developed by the cracking of the slab coupled with the construction sequence moments resulting from an applied deformation pattern to the mat.
It was also pointed out that other conservatisms have been included in the analysis, namely; a) the stresses due to dead weight have been partly included in both the construction sequence and operational load analyses; and b) there is a lateral compressive force due to side wall soil / water pressure which acts on the mat and tends to reduce steel tension stresses.
)
It was agreed that EBASCO should perform a variation-of parameter study for the construction sequence analysis and properly combine the resulting moments with those from the other load cases.
The extent of the variation in the parameters to be considered should be justified by EBASCO, based on the known characteristics of the mat and the tolerances in the data used to perform the constructionseguenceanalysis.
The mat would be considered acceptable pro-vided that the ' best engineering estimate" for the reinforcing steel stresses are all less than yield.
If this cannot be shown, then EBASCO may be required to demonstrate that the increased flexibility of the cracked mat does not adversely affect the floor response spectra used for piping and equipent design.
EBASCO indicated that they would have data available for review within two weeks.
BNL/NRC comments on the proposed monitoring program were discussed.
The following are the resolutions to the six questions raised by BNL/NRC:
CONTACT-P. T. Kuo/NRR, MEB 49-27542 8705140081 870M PDR ADOCK C5000392.'
p PDR
P. T. Kuo 1.
LP&L agrees to maintain the crack monitoring, settlement, and water level measurements on a schedule which ensures that data are obtained at common times.
2.
The schedule for the above measurements will be such that at least yearly cyclic data will be obtained.
3.
It was agreed that curvature calculations should not be part of the monitoring program, since required data will be available and such a computation can be made outside the context of the program, if deemed necessary.
4.
The reference to stresses resulting from a 25-inch settlement. mentioned in the previous description of the monitoring program contains typo-graphical errors and will be corrected.
5.
LP&L agreed to continue the photographic survey of the wall areas for at least the next two scheduled time periods.
6.
EBASCO noted that the survey closure areas are sufficiently small so that any distribution of this error to individual legs of the survey would be less than the accuracy contained in the measurements.
It was agreed i. hat this correction should not be made.
8)/abu)
. T. Kuo, Section Chief Mechanical Engineering Branch Division of Engineering and System Technology
Enclosures:
As stated
Mr. Jerrold G. Dewease Waterford 3 Louisiana Power & Light Company cc:
W. Malcolm Stevenson, Esq.
Regional Administrator, Region IV Monroe & Leman U.S. Nuclear Regulatory Commission 1432 Whitney Building OfficeofExecutiveDigectorfor New Orleans, Louisiana 70103 Operations 611 Ryan Plaza Drive, Suite 1000 Mr. E. Blake Arlington, Texas 76011 Shaw, Pittman, Potts & Trowbridge 2300 N Street, NW Carole H. Burnstein, Esq.
Washington, D.C.
20037 445 Walnut Street New Orleans, Louisiana 70118 Mr. Gary L. Groesch Post Office Box 791169 Mr. Charles B. Brinkman, Manager New Orleans, Louisiana 70179-1169 Washington Nuclear Operations Combustion Engineering, Inc.
Mr. F. J. Drummond 7910 Woodmont Avenue, Suite 1310 ProjectManager-Nuclear Bethesda, Maryland 10014 Louisiana Power & Light Company 317 Baronne Street Mr. William H. Spell, Administrator New Orleans, Louisiana 70160 Nuclear Energy Division Office of Environmental Affairs Mr. K. W. Cook Post Office Box 14690 Nuclear Support and Licensing Manager Baton Rouge, Louisiana 70898 Louisiana Power & Light Company 317 Baronne Street President, Policy Jury New Orleans, Louisiana 70160 St. Charles Parris Resident Inspector /Waterford NPS Post Office Box 822 Mr. J. G. Dewease Killona, Louisiana 70066 Senior Vice President - Nuclear Operations Louisiana Power and Light Company Mr. Ralph T. Lally 317 Baronne street, Mati Unit 17 New Orleans, Louisiana 70160 ManagerofQualityAssurance s
Middle South Servies, Inc.
Post Office Box 61000 New Orleans, Louisiana 70161 Chairman Louisiana Public Service Commission One American Place, Suite 1630 Baton Rouge, Louisiana 70825-1697 y
g.
List of Attendees at Audit in New York on April 14, 1987
- NRC P. Kuo BNL C. Costantino C. Miller LP&L K. Cook R. Burski M. Holley i
l EBASCO I
A. Wern P. Liu J. Costello S. Sheng W. Wittich I. Bari 4
i e
l
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