ML20056B492
| ML20056B492 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/22/1990 |
| From: | Alexion T Office of Nuclear Reactor Regulation |
| To: | Carns N ENTERGY OPERATIONS, INC. |
| References | |
| TAC-62802, NUDOCS 9008280356 | |
| Download: ML20056B492 (5) | |
Text
August 22, 1990 i*
'S-
, Docket No. 50-368 Entergy Operations, Inc.
ATTN: Mr. Neil S. Carns Vice President, Operations Arkansas Nuclear One Post Office Box 551 Little Rock, Arkansas 72203
Dear Mr. Carns:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF CONDENSATE STORAGE TANK SEISMIC QUALIFICATION (TAC 62802) i By letter dated June 18, 1990, Entergy Operations responded to the staff's questions regarding the condensate storage tank seismic qualificatioa for i
Arkansas Nuclear One, Unit 1.
The staff is currently reviewing the responres and has determined that additional information is required in order to complete its evaluation.
Enclosed is a set of questions related to the information provided by Entergy Operations.
Please provide your response within 45 days to facilitate the completion of the staff's effort.
Sincerely, i'
[
origiani sisned Dr s l
Th ues W. Alexion, Project Manager l
Project Directorate IV-1 Division of Reactor Projects. III IV, V and Special Projects 9008280356 900822 Office of Nuclear Reactor Regulation PDR ADOCK 05000368 P
PNV
Enclosure:
As stated cc w/ enclosure:
See next page DIS 1RIBUTION
- Docket
- F.ile.-
D. Crutchfield MS 13E4 NRC PDR L. Tran Local PDR C. Tan MS 7H15 PD4-1 Reading PD4-1 Plant File T. Quay ACRS(10)MSP-315 L. Berry E. Jordan MNBB 3701 T. Alexion (2)
OGC MS 15B18
- PD4-1/PM AhP 0FC
- PD4-1/L
- PD4-1/PE
......:__.[.......__:........Ls..::_D4-1/D____.4~M_
- LTra
- T Alexion # :TQuay NAME
- LBer
___...:.............__:.......___...:....______(__.:.._____.._____:__....________:.....
DATE
- 08/R/90
- 08/l} /90
- 08/h/90
- 08/My90 OFFICIAL RECORD COPY Document Name:
00045 g
4__
m 7 pk ElCof 5
'[%,
UNITED STATES '
8" NUCLEAR REGULATORY COMMISSION g
jj WASHINGTON, D. C. 20555
%,..... p#
August 22, 1990 I
Docket-No.
50-368 Entergy Operations, Inc.
ATTN: Mr. Neil S. Carns Vice President, Operations Arkansas Nuclear One
' Post Office Box 551 Little Rock, Arkansas 72203
Dear Mr. Carns:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF CONDENSATE STORAGETANKSEISMICQUALIFICATION(TAC 62802)
By letter dated June 18, 1990,- Entergy Operations responded to the staff's questions regarding the condensate storage tank seismic qualification for Arkansas Nuclear One, Unit 1.
The staff is currently reviewing the responses and has determined that additional information is required in order to-complete its evaluation.
Enclosed is a set of questions related to the
-information provided by Entergv Operations.
Please provide your response within 45 days to facilitate the completion of the staff's effort.
Sincerely, L
C
[
'u T
\\
',W y
Thomas W. Alexion, Project nager Project Directorate IV-1 Division of Reactor Projects - III IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
As stated cc w/ enclosure:
See next page
s-n; 7
Entergy Operations, Inc.
Arkansas Nuclear One, Unit I cc:
Mr. Early Ewing, General Manager Mr. Donald C. Hintz Technical Support and Assessment Executive Vice President Arkansas Nuclear One and Chief Operating Officer Route 3 Box 137G Entergy Operations, Inc.
Russellville, Arkansas 72801 P. O. Box 31995 Jackson, Mississippi 39286 Mr. Jerry Yelverton Mr. Gerald Muench Director Nuclear Operations Vice President Operations Support Arkanses Nuclear One Entergy Operations, Inc.
Route 3 Box 137G P. O. Box 31995 Russellville, Arkansas 72801 Jackson, Mississippi 39286 Mr. Nicholas S. Reynolds Mr. Robert B. McGehee, Esquire Bishop, Cook, Purcell & Reynolds Wise, Carter, Child & Caraway 1400 L Street, N.W.
P. O. Box 651 Washington, D.C.
20005-3502 Jackson, Mississippi 39205 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division 1700 Rockville Pike, Suite 525 Rockville, Maryland 20852 Senior Resident Inspector U.S. Nuclear Regulatory Commission 1 Nuclear Plant Road Russeilville, Arkansas 72801 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Honorable Joe W. Phillips County Judge of Pope County Pope County Courthouse Russellville,. Arkansas 72801 Ms. Greta Dicus. Director Division of Environmental Health Protection Arkansas Department of Health 4815 West Markam Street Little Rock, Arkansas 72201
L Enclosure REQUEST FOR ADDITIONAL INFORMATION ARKANSAS NUCLEAR ONE. UNIT 1 CONDENSATE STORAGE TANK SEISMIC QUALIFICATION We have reviewed your responses to the nine questions and have reservations on
. the adequacy and acceptability of most of the responses. On the basis of the limited information available in our files we find it difficult to conolete the review of the CST design and your responses.
The information whici we have on the seismic design of the CST as based on your July 31, 1986 and June 10, 1990 submittals can be summarized as follows:
a)
The CST foundation consists of a 30 in thick reinforced concrete (RC) base slab supported by a series of 27 RC drilled piers, each 42 in, in diameter, extending down into unweathered shale.
The tank height is 31 ft. and the tank inside diameter is 42 ft.
The approximate bolt circle is 42.5 ft.
b)
The ANO-2 design basis earthquake (SSE) of.209 ground acceleration cnd AN0-2 design spectra are used.
c)
The CST foundation design is partially in accordance with the ANO-2 SAR design criteria as described in the July 31, 1986 submittal.
Specifically, the ANO-2 fixed based models for the seizmic Category I structures are not adopted for the seizmic design of the CST.
d)
According to the responses contained in the June 18, 1990 submittal it is indicated that the design control motion is applied at a rock outcrop cod, the rock motion and free field surface motion are computed by using SHAKE.
e)
There is a 5 ft high partial totoado protection missile shield wall around the CST.
In order to perform a meaningful review of the seismic adequacy of the CST and the respcnses to our questions, the following information is required:
1.
The geometrical configuration of the CST together with the dimensions and steel plate thicknesses of the cylinder and dome; the size and spacing of the bolts.
2.
The elevation of the CST concrete base slab in relation to the plant finished grade elevation.
3.
The location of the 27 RC drilleo piers and their lengths together with information on sizes and arrangement of rebars in the piers, if any.
rF
.. 7 4.
The thickness of the 5 ft. hiah concrete tornado missile shield wall and details of rebar size and' spacing' including connections to the base mat and spacing between the steel CST and the wall.
Indicate if this wall is a seismic Category I structure.-
5.
The results of the design control motion at a rock outcrop and the rock motion and free field surface motion as computed by SHAKE; and the results of the bedrock motion after deconvolution by FLUSH.
Provide the response spectrum at each location.
6.
The mathematical model used in the soil-structure analysis using FLUSH.
7.
A summary of the calculation indicating how the steel tank, the concrete base slab, and the tornado missile shield wall were analyzed and designed.
Provide the soil parameter values if used in the analysis.
8.
The CST design,at ANO-1 is unique in that it is supported on drilled piers which are anchored into the unweathered bedrock at the bottom and rigidly connected with the CST concrete base slab at the top.
Justify the use of SHAKE and FLUSH for the soil-structure interaction analysis, and also the application of the results of the Taiwan Power.
s study to the ANO-1 CST design.
.