ML20147C291
| ML20147C291 | |
| Person / Time | |
|---|---|
| Site: | 07001308 |
| Issue date: | 11/09/1978 |
| From: | Dawson D GENERAL ELECTRIC CO. |
| To: | Cunningham R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20147C295 | List: |
| References | |
| DMD-256, NUDOCS 7812180224 | |
| Download: ML20147C291 (3) | |
Text
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DIVISION GENERAL ELECTRIC COMPANY,175 CURTNE3 AVE., SAN gSy~/ CALIFORNIA 9512s U.S ' '
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3 DMD-256 T
- il0H Docket No. 70-1308 j
License SNM-1265 November 9, 1978 Office of Nuclear Material Safety & Safeguards Attention: Mr. R.E. Cunningham, Acting Manager Div1sion of Fuel Cycle & Material Safety U.S. Nuclear Regulatory Commission Washington, D.C.
20555
SUBJECT:
ADDITIONAL INFORMATION re LACROSSE FUEL ASSEMBLY STORAGE AT THE MORRIS FACILITY j
Reference:
Letter to R.E. Cunningham from D.M. Dawson, Response to Questions re Lacrosse Fuel Assemblies; dated October 26, 1978 Gentlemen:
As discussed in a telephone conversation between Fleming Empson (NRC), Bob Stevenson (NRC), and Bob Stitt (GE) on November 2, 1978, the following information is submitted to clarify the assumptions used in the reference letter.
The hypothetical extension of the fuel out of a storage basket, in the unlikely event that such a basket is dropped or otherwise tipped over in the unloading pit, is limited to 42 inches by the dimensions of the pit (12 ft x 16 ft).
Forty-two inches is determined from a horizontal, diagonal orientation of the basket and extended fuel.
Sketch 1 is a non-scale representation of the attitude of the basket and extended fuel as it rests on the floor of the unloading pit.
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11208 fi' 7 812180 22Y
GENER AL h ELECTRIC The extended fuel is supported (support point) by the basket guide plate 1.2 inches abovg the floor. The maximum deflection of the free end of the fuel is 0.5 inches.
Because the fuel does not touch the floor, the normal spacing of the fuel is preserved.
From this analysis we conclude that the one inch reduction in vertical centerline spacing of the fuel over the entire length, assumed in the analysis of keff, is conservative.
Substantial additional conservatism is introduced through the assumption that the fuel is unirradiated whereas the 3.925% enriched Lacrosse fuel has undergone a minimum irradiation of 15 GWD/MTV.
The evaluation of the keff of this array was made by Battelle Pacific Northwest Laboratories using the KENO-II code.
(see attached letter).
This is the same method that was used and verified in the GE May, 1975 submittal for Project I (Criticality Safety Basis for MFRP Progiect I-Fuel Bundle Storage Baskets, Battelle Pacific Northwest Laboratories, May,1975).
Please contact either C.C. Herrington or R.K. Stitt if there are further questions regarding these matters.
Respectfully submitted, GENERAL ELECTRIC COMPANY
[
.M. Dawson, Manager Licensing & Transportation 408*925-6330 MC 861 DMD:RKS:bn Attachment
- - Fuel deflection reported by Dairyland Power Cooperative l
1 I
i
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i Extended fuel Fuel Basket
\\ Maximum deflection:
0.5 inch j
Extended fuel t
U a
N N
N N
N N
NA N
N N
N N
N N
N N
Floor Support [ Clearance:
Floor point 1.2-inches SKETCH 1 Tipped fuel basket with fuel. extended f
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