ML20052F494
| ML20052F494 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/07/1982 |
| From: | Parker W DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8205130082 | |
| Download: ML20052F494 (4) | |
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s DUKE POWER COMPANY Powen Dust.nixo 422 Sourn Cauncir STHEET, CILAHIDTTE, N. C. asa4a wl LLIAM O. PA R M E R,.J R.
s[eI! ".'o'o' c',','o May 7, 1982 Tctc -o~c: Aaca 704 373-4083 E
Mr. Harold R. Denton, Director q
k Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission 6'
Washington, D. C. 20555 RECE;yED 2 2 fggg -Q Attention:
Ms. E. G. Adensam, Chief g
a Licensing Branch No. 4 gg Re: Catawba Nuclear Station d
Docket Nos. 50-413 and 50-414 02 r.n
Dear Mr. Denton:
Elinor G. Adensam's letter of March 8,1982 requested additional information related to the storage of non-Catawba fuel at the Catawba Nuclear Station.
My letter of April 2, 1982 provided responses to these questions with the exception of questions 6 and 10c, which are attached.
Very truly yours,
/.
/
William O. Parker, Jr.
ROS/php Attachment cc:
Mr. J. P. O'Reilly Mr. P. K. Van Doorn Mr. R. Guild Palmetto Alliance Mr. J. L. Riley Mr. H. Pressler 8205130092 820507 PDR ADOCK 05000413 X
PDR 61 l
i Duke Power Company Catawba Nuclear Station Response to Questions 6 and 10c of Elinor G. Adensam's letter of March 8, 1982:
6.
Provide the verification results of the KENO code used. This should include a description of the experiments which were calculated and the bias and standard deviation of the calculational results.
It should be noted that the KENO code was not previously approved by the NRC.
Response
The calculation method and cross-section values are verified by comparison with critical experiment data obtained from Reference 1.
The experimental lattice arrays and structure are similar to what is found in a spent fuel storage rack.
Tiedesign method which ensures the criticality safety of fuel assemblies in the spent fuel storage rack uses the Hansen and Roach 16 group cross-section library (Reference 2) for cross-section generation and KENO IV (Reference 3) for reactivity determination.
A set of thirteen (13) critical experiments have been analyzed using the above method to determine its applicability to criticality analysis and to establish the method bias and variability. The experiments consist of water moderated and reflected, 2.35 Wt%235U oxide fuel arrays separated by water and stainless steel that simulate LWR fuel storage conditions.
The results and some descriptive facts about each of the 13 benchmark critical experiments are given in Table 6-1.
The average Keff of the bench-marks is 1.0083 which demonstrates that there is a conservative bias of
.0083AK associated with the method. We do not take credit for this conserva-tive bias in the design calculations. The standard deviation of the K gf e
values is 0.0043AK.
(1)
S. R. Biermin, E. C. Clayton, and B. M. Durst, " Critical Separation between Subcritical Clusters of 2.35 Wt%235U Enriched UO2 Rods in Water with Fixed Neutron Poisons," PNL-2438, Battelle (October 1977).
(2)
G. E. Hansen and W. H. Roach, "Six and Sixteen Group Cross Sections for Fast and Intermediate Critical Assemblies," LAMS-2543 (November 1961).
(3)
" KENO IV - An Improved Monte Carlo Criticality Program," ORNL-4938 (November 1975).
k
TABLE 6-1 BENCIBIARK CRITICAL EXPERIMEh"TS Experiment Separating Critical Separation Number Material Between Fuel Clusters (cm)
Keff 1.
002 Water 1.0057i.0033 2.
015 Water 11.92 1.0141t.0035 3.
005 Water 8.39 1.0065t.0035 4.
022 Water 6.39 1.0100t.0031 5.
045 Water 8.0) 1.0069t.0031 6.
021 Water 4.46 1.0171i.0031 7.
028 Stainless Steel 6.88 1.0054t.0029 8.
005 Stainless Steel 7.64 1.0003+.0030 9.
029 Stainless Steel 7.51 1.0058i.0032 10.
027 Stainless Steel 7.42 1.0098t.0030 11.
026 Stainless Steel 7.76 1.0113t.0030 12.
034 Stainless Steel 10.44 1.0069t.0032 13.
035 Stainless Steel 11.47 1.0079i.0030
=
10.c What is the average population density along each of the proposed routes?
Response
The following population densities apply to the routes identified in 10.a and are expressed in average persons per square mile.
McGuire to Catawba Rail Routes Truck Routes A - 1125 A - 719 B-711 B - 675 C-960 C - 676 D - 463 Oconee to Catawba - Truck Routes A - 509 B - 529 C - 312 D - 569 E - 602 F - 362 G - 362 H - 385 I - 154 l
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