ML20041D882
| ML20041D882 | |
| Person / Time | |
|---|---|
| Site: | 07109151 |
| Issue date: | 02/18/1982 |
| From: | Mcdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Mallory C HITTMAN NUCLEAR & DEVELOPMENT CORP. (SUBS. OF HITTMAN |
| References | |
| NUDOCS 8203090406 | |
| Download: ML20041D882 (2) | |
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ATTH: Mr. Charles W. Mallory
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O Columbia, MD 21045 Gentlemen:
This refers to your application dated June 16, 1981, as supplemented January 11 and 27, 1982, requesting approval of the Model No. HN-100 Series 3 packaging.
In connection with our review, we need the information identified in the enclosure to this letter.
Please advise us within thirty (30) days from the date of this letter when this infomation will be provided. The additional informtion requested by this letter should be submitted in the fonn of revised peges.
If you have any questions regarding this matter, we would be pleased to meet with you and your staff.
Sincerely.
Originel ::igned by CIIARLES E. MACDONALD, Charles E. MacDonald, Chief Transportation Certification Branch Division cf Fuel Cycle and Materipi Safety, FMSS l
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Hittman Nuclear & Dev71cpnent Corporation Model No. HN-100 Series 3 Packaging Docket No. 71-9151 I
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STRUCTURAL 1.
Tie-down devices (a) The tie-down devices have not been shown to meet the requirements i
of withstanding a static force having components equal to log horizontal, Sg transverse and 2g vertical applied at the package centroid.
Your analysis has been based on yield shear stress unifomly distributed on the gross shear planes. The 3
shearing stress, however, is zero at the free edge *. Thus, the true shearing stress distribution varies across the shear a
plane in the fom of a parabola.
For simplicity, when allowable shear stress (i.e., 0.4Fy, AISC Manual) is used, the total shear capacity is computed as the product of allowable shear stress and the gross shear area.
If allowable shear stress is used, the tie-down devices will not have adequate shear capacity to withstand the tie-down force required.
(b) Address failure of the tie-down devices under excessive load following the successful resolution of the tie-down devices to meet 1(a).
2.
Bottom corner drop The analysis does not demonstrate that the effectiveness of the package under normal conditions of transport will not be reduced by a bottom corner drop. Justify that shear force on the bottom plate will be divided and then resisted by the welds and the outer shell.
The force generated by the package contents and the effectiveness of the welds at the bottom corner due to impact should be evaluated.
3.
Top corner drop on long flat edge The ratchet binder tie-down lug has not been shown to have adequate shear capacity to sustain the force in the ratchet binder induced by the drop. Justify that the adequacy of the ratchet binder based on ultimate strength rather than the yield strength.
CONTA!! MENT 1.
Provide procedures followed to demonstrate the cask is leak tight prior to first use (10 CFR 571.53(a)).
2.
Revise the drawings to show torques or forces to be applied to closures and flatness of all sealing surfaces (10 CFR 571.35(a)(1)).
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