ML20198G907
| ML20198G907 | |
| Person / Time | |
|---|---|
| Site: | 07003040 |
| Issue date: | 05/14/1986 |
| From: | Bailey J GEORGIA POWER CO., SOUTHERN COMPANY SERVICES, INC. |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 0483V, 26995, 483V, GN-912, NUDOCS 8605300041 | |
| Download: ML20198G907 (6) | |
Text
N Georgia Power Company Route 2. Box 299A fe!" Ort?5;S;*J,*
RETURN TO 396-SS N-404 724-8114
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8 Southern Company Services. Inc.
Post Office Box 2625 Birmingham Alabama 35202 Telephone 205 670-6011 Q% h h
Vogtle Proj.ect I
MAY 2 01986
- T 0.5.MoctIARREGIM 3 COMMtss10M MMSS May 14, 1986 mait sectka Director of Nuclear Material File:
X3BC35 Safety and Safeguards Log:
GN-912 U. S. Nuclear Regulatory Commission Washington, D.C.
20555 REF: LETTER FROM GEORGE H. BIDINGER TO R. E. CONWAY DATED APRIL 10, 1986 NRC DOCKET NUMBER 50 424 CONSTRUCTION PERMIT NUMBER CPPR-108 V0GTLE ELECTRIC GENERATING PLANT - UNIT 1 SPECIAL NUCLEAR MATERIAL LICENSE
Dear Sir:
Enclosed are eight copies of the supplemental information requested in the above referenced letter. We trust this information will be sufficient for you to complete the review and approval of this application.
Should you have any additional questions, please inquire.
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Since rely, g
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. A. Bailey I
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Z!l Project Licensing Manager
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R. E. Conway G. Bockhold, Jr.
t R. A. Thomas D. C. Teper
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J. E. Joiner, Esquire W. C. Ramsey B. W. Churchill, Esquire NRC Resident Inspector M. A. Miller (2)
L. T. Gucwa B. Jones, Esquire B. E. Hunt Vogtle Project File 0483V khhoh hbo 40 mt
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DOCKET NO.
CONTROL NO.
OMf DATE OF DOC.
OS//k/[d DATE RCVD., O[!N Od FCUF PDR FCAF LPDR WM I&E REF.
WMUR SAFEGUARDS FCTC OT!!ER 33SC_RIPTION:
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Supplemental Information Georgia Power Company Application Dated February 1986 Vogtle Electric Generating Plant-Unit 1 1.
We do not believe that sufficient experimental data is available for low-density hydrogenous moderation, of low-enrichment uranium arrays to permit validation of k-effective calculations with a 0.98 limit.
It will be necessary to show that validated k-effective values do not exceed 0.95 for the storage arrays or extensive controls must be established to exclude the low-density moderator from the array.
Response
The use of a k-eff limit of 0.98 for the low density hydrogenous moderation accident has been accepted by the NRC for the past several years. It is recognized by the NRC and the industry, that experimental data on low density hydrogenous moderation of low enrichment uranium arrays is limited. However, the 0.98 k-eff limit was deemed acceptable due to the effectively zero probability that any kind of accident can produce the optimum low density moderation needed to cause a criticality concern.
This limit has been reported in several Westinghouse 17x17, 4 loop plant technical specifications and FSAR's included those of Vogtle. Technical Specifications and FSAR's using the 0.98 valve have been reviewed and licensed by the NRC.
In order to confirm the current _ status of the k-eff valve, Westinghouse had a discussion with a member of the NRC staff and it was determined that 0.98 is the acceptable k-eff limit for the low density moderation accident. This limit is based on present internal NRC review guidelines.
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2.
The storage cells' characteristics, e.g., materials of construction, inside dimensions, and wall thickness, should be provided so that we can' independently calculate the k-ef fective of the storage arrays for f resh t
and spent fuel racks. A cross-sectional view of the poisoned spent fuel cell showing dimensions and material locations would be very helpful.
Response
Cross sectional drawings of the new and spent fuel cells are attached.
1232n/wfg/4-86
GAE (VOGTLE)
SPENT FUEL STORAGE RACK GEOMETRY e.
CELL & WRAPPER:
SA 240 TYPE 304 BORAFLEX:
THK.078 IO 2
B
.O20 GM/CM
~.075 STK
-~
(CELL ENCL)
^^
n 7.50
.020 STK
=
=
(BORAFLEX)
(WRAPPER) 5'
'e U
lO.60 NOMINAL (CELL CENTER o
U TO CENTER)
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a n
n h
.090 8.800 SO (WRAPPER CAVITY)
I.43 NOM i.II MIN (WATER GAP) o aumen - -
e--
amemo amme exams - - amme - - - emme e-em - eene samme
-e e-m
- - - - - - - - - = = = = = = = = =
- e GAE (VOGTLE)
NEW FUEL STORAGE RACK GEOMETRY MATL: SA240 TYPE 304
.075 CELL WALL THK u
i l i l 9.00 di INSIDE SO U
21.00 CELL CENTER TO CENTER U
e e up esamme - - - ammam -
e==ve
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