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. Docket F11W"...S. Kari-9 AEC PDR.
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- 8dR 2 R. S. Boyd 4
P J. Riesland.
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S. H. Hanauer*
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Dockee Nos. 50-2 #.e=*-$
F. Schtoeder.
and150-265 T. R. Wilson.
R. S. Boyd
- P R. C. DeYoung*
D.'J. Skovholt*
Comanonwealth Edison Company H. R. Dentorf ATTN:
Mr. Byron Lee, Jr..
G. Lainas' Assistant'to the President E. G. Case
- P. O. Box 767_
R. R. Maccary *
' I Chicago, Illinois 60690 BWR Branch Chiefs OGCa Gentiemen:
C0 (2)**
In'your lett'er. dated October 22, 1971, subject " Request to Install an Energy Absorbing system on Quad-Cities Units 1 and 2", you described 1
specific design features for a system that would serve to mitigate the consequences of an unlikely drop of a fuel shipping clask for the Quad-Cities fuel pools.- A' review of your proposed prelirainary design and analyons[ indicate that the following additional supporting information will be needed to lete our evaluation:
1.
Provide resist!ance functions (resistance ve deflection) for the proposed energy absorbing structure and the supporting fuel pool floor along with the technical bases for these functions. The bases for the values used along with a discussion of margins provided for uncertainties should be included in your response.
2.
Provide estimates of the fractions of' input energy absorbed by
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1 the proposed energy absorbing structure and the fuel storage pool i
floor, and estimates of the side and leak rates of the residual cracka in the pool floor following the assumed cask drop.
Include a discussion of water makeup system capabilities to makeup excessive water loss from the pool including the bases for the water leakage s
estimates along with a discussion of the conservatism used in the calculations.
1 3.
Justify the use of $37 psi for the allowable shear across concrete joints for the fuel pool structure. ACI318-63 does not appear to make allowance for such a high shear stress value. Include with
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s your justification sketches of the joints subjected to these shears.
j Sincerely, 9709240385 870921 ZB 1
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