ML19247B120
| ML19247B120 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/12/1979 |
| From: | Cheng T Office of Nuclear Reactor Regulation |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7908070769 | |
| Download: ML19247B120 (4) | |
Text
1 DISTRIBUTION Occket 50-10 Central FJles NRC POR v Local PDR SEPB Reading NRR Reading H. R. Den *:n
~
E. G. Ca<a L. Shao R. Vollmer W. Russell B. Grimes T. J. Carter D. Eisenhut 00R Branch Chiefs S. Nowicki Attorney, OELD OI&E (3)
Hazel Sm'th R. Fraley, ACRS (16)
D. Segal T. Cheng C. Hofmayer J. R. Buchanan TERA Licensee & cc Ishtm, Lincoln & Beale Councelors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. 3. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rural Route 41 Morris, Illinois 60450 U. S. Nuclear Regulatcry Commission ATTN: Jimmy L. Barker P. O. Box 7'J6 Morris, Illinois 60450 Susan N. Sekuler Ass 4 stant Attorney General Envirenmental Control Division 188 W. Ranaciph Street Sui te 23'5 2'!'
( U J1 Chicago, Illinois 60601 me I'
I f
/
f * "'%
UNITED STATES
[",.
NUCLEAR REGULATORY COMMISSION
^
WASHINGTON, O. C. 20555
- .y 3
./
JUL 12 579 MEMORANDUM FOR:
D. Ziemann, Acting Chief Systematic Evaluation Program Branch, DOR THRU:
C. Hofmayer, Section Leader Engineering Section, Systematic Evaluation Program Branch, 00R FRCM:
T. M. Cheng, Systematic Evalua' tion Program Branch, DOR
SUBJECT:
SUMMARY
OF MEETING WITH COMMONWEALTH EDISCN COMPANY AND SARGENT & LUNDY ENGINEERS - SEISMIC DBE REVIEW 0F DRESDEN 1 NUCLEAR STATION On June 13, 1979, members of NRC staff met with Commonwealth Edison Company and < rgent & Lundy Engineers (attendees listed in Enclosure 1) to discuss
. cal questions related to the Systematic Evaluation Program (SEP) smic DBE review of Dresden 1 Nuclear Station, and to identify and obtain information which is not available to the staff.
The meeting opened with a discussion by T. M. Cheng of the SEP Branch addressing the purpose of this meeting. The discussions focused on the following three reports submitted by the licensee.
1.
" Stress Report for Primary Containment Penetrations, Dresden Nuclear Pc er Station - Unit 1," Report No. SAD-257, November 1977 2.
" Seismic Analysis of the Reactor and Steam Drum Support Structure Inside the Containment, Dresden Nuclear Power Station - Unit 1,"
Report No. SAD-261, January 1977.
3.
" Feasibility Analysis of the Primary Containment Vessel to Meet NRC Criteria, Dresden Nuclear Power Station - Unit 1," Report No. SAD-257, February 1977.
The staff explained that the full understanding of these reports listed above including the basic assumptions, modeling techniques, and solution approach will assist the staff in deciding on a reasonable approach with the licensee for demonstrating the structural capabilities of Dresden 1 plant to withstand earthquake effects. The results of the discussions and the staff's comments are summarized below.
- p I, JUL iJ" 7908070769
. 1.
The licensee agreed to provide the following information within three weeks:
Primary Containment Vessel A) Description of the containment sheil model for axisymmetric static load and method of modeling tna columns as an equivalent cylinder.
B) Justification for neglecting the surrounding columns in the dynamic model of the containment shell and stress concentration at the shell-column connections during a seis.1c event.
9 Containment Internal Structures A) Justification for modeling one concrete slab into several uncoupled masses instead of one lumped mass at the floor level.
B) Mode shapes for each mode up to 30 Rt obtained from the existing analysis (Report SAD-251) - both r.orizontal and vertical nodels.
C) Structural responses obtained from ex : sting analysis - to be provided later.
Containment Penetrations Report (or reports) describing the detail of penetrations, applied loads, methods of analysis, codes and design criteria, and analysis results.
2.
After reviewing the information listed above, the staff will get back to the licensee to discuss the future plan for seismic rean& lysis that the licensee will follow to complete the SEP effort.
f l$Y!) /*
W Thomas M. Cheng
/
Systematic Evaluation Program Branch Division of Operating Reactors
Enclosure:
As stated
{ Ii
. au
?
~
ENCLOSURE 1 LIST OF ATTENDEES MEETING WITH CCMMONWEALTH EDISON COMPANY AND SARGENT & LUNDY ENGINEERS, JUNE 13, 1979 NRC David Segal SEPB/ DOR Thorras M. Cheng SEPB/ DOR CECO J. S. Graves J. M. Kotows.
N. Sr.li th J. L. White S&L A. Walser V. Kurnar T. J. Victorine a
f.
JLd 4/d J
_