ML19345B761
| ML19345B761 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/26/1980 |
| From: | Delgeorge L COMMONWEALTH EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012020465 | |
| Download: ML19345B761 (2) | |
Text
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Commonwealth Edisou on a First N tion't Plaza. Chic'go. Illino:s Address Reply to: Post Office Box 767 Chicago, iltinois 60690 November 26, 1980 Mr. B.
J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U.S. Nuclear Regulatory Commission
. Washington,.DC 20555
Subject:
LaSalle County Station Units 1 and 2 Response to Informal NRC Inquiry Suppression Pool Column Design NRC Docket Nos. 50-373/374
Dear Mr. Youngblood:
This is in response to the two questions brought up by Mr.
C.
P. Tan of the NRC in a conference call with Commonwealth Edison Company on November 20, 1980.
Mr. Tan had the following questions:
1.
The DAR Section 5 write-up on the containment model indicated it was comprised of 392 elements.
A subsequent breakdown of sections of the model listing the number of elements in each section produced a total number of elements exceeding 392.
What is the basis for this discrepancy?
2.
What is the margin in the suppression pool columns?
No information is given in the DAR.
Responses to the above questions are as follows:
1.
The particular paragraph in OAR Section 5 is not correct.
The corrected write-up on page 5.1-1, Section 5.1.1, second paragrapn, 12th line to the end of the page, will read as follows:
The model uses 399 elements and 362 nodes to represent the structure.
Of the 399 elements used, 187 thin-shell elements represent the structure and the RPV, 14 solid elements represent the concrete fill added to the neodified reactor support, 40 solid elements represent the suppression pool water, and 158 solid elements represent the soil.
The RPV is represented by 24 shell elements.
2.
The following table depicts the requested margin factors for suppression pool columns in cending and shear, listed according to the pertinent loading conditions of Table 4.1-1 of the DAR and enumerated for the most critical Soc /
sections.
3 8 012020 k x(
. o e
- 2:-
' Loading Equation Margin Factor.
Margin Factor--
(as per CAR) for Bending for Shear 1
1.089 1.500 3
-1.107 1.522 4-
.1.004 1.224 5
1.002 1.238
-6 1.317 1.821 7
~1.059 1.391 The.above information answers Mr. Tan's questions and will be included in the next revision of the DAR.
If you should have any further questions in this regard, please direct them to this office.
Sincerely, y ?'
- &.. n.c
- . y c.
L. O. DelGeorge Nuclear Licensing Administrator cc:
RIII Resident Inspector - LaSalle SUBSCRIBED and SWORN to befort,me this / ~ ' day of e-
, 1980 x...C 9 :n
_ Notary.PUDlic~
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