ML19338F779
| ML19338F779 | |
| Person / Time | |
|---|---|
| Site: | 07000371 |
| Issue date: | 10/05/1980 |
| From: | Stevenson R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Kirk W UNITED NUCLEAR CORP., UNITED NUCLEAR CORP. (SUBS. OF UNC, INC.) |
| References | |
| NUDOCS 8010270228 | |
| Download: ML19338F779 (23) | |
Text
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UNITED STATES j_ t -
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[' i NUCLEAR REGULATORY COT." MISSION J
/,C L', ASHINGTON. D. C. 205LS G.
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'900 CUP:RLS70-371 United f:uciear Corporation
- aval Products Division ATTil:
Mr. William F. Kirk, Manager fluclear and Industrial Safety 67 Sandy Desert Road Uncasville, Connecticut 06382 3entlemen:
'..'e. 5ve reviewed the classified application dated September 19, 1980, concerning changes in your storage criteria.
Our review has revealed a need for additional information as identified in the Enclosure. We will continue our review following receipt of the additional in forma tion.
Sincerely, Q d 'f.; kJ rn<,4 Robert L. Stevenson Uranium Process Licensing Section dranium Fuel Licensing Branch Division of Fuel Cycle and flaterial Safety
Enclosure:
Comments and Questions
- n Application Dated September 19, 1930, Docket 70-371 a
8e202782 4
Comments and'. Questions on Application Dated September 19, 1980, Docket 70-371
~
1.
Page 8.3-2 -- Proposed changes to the text of Section 8.3 imply that
- additional material (other than described in the existing text of Section 8.3) is to be stored in the room.
It is not clear where the material will be stored or what interaction criteria were used 4
for the overall analysis of the total. room inventory.
Please explain and-provide additional justif;ication if deviations from the existing analyses and storage arrangements are to be made.
. 2.
Pages 7.3-1 and 7.3-2 -- Paragraph 7.3.1.1.1 quotes surface density criteria fro-Document LA-3366, Rev., by H. C. Paxton.
It is not clear what ryuirements you plan.to' impose in the use _of the criteria, whether the criteria apply to your situation and whether the criteria
~
provide for safe conditions.
Further information to justify your use of the criteria is necessary for reasons explained below.
a.
There are no limits on array reflection.
b.
The quoted maximum unit mass exceeds 0.3 of the bare critical mass.
i (See Table 4.4 of TID-7016, Revision 2.)
c.
There are no limits on the material of the packaging, notably moderator content.
d.
There are no vertical spacing requirements for stacked units (subparagraph 5 of 7.3.1.1.1),
e.
The safety margin provided-by the use of the LA-3' 66 criteria may 3
be inadequate:
(1)
Use of the storage criteria based on Tables 4.1 and 4.2 of TID-7016, Rev. 2, indicates that a. finite array (about 192 units) of Masg~ Category HH would have a surface density of 4
about 3 kg/ft' as a single layer array and would approximate Paxton's criterion for surface density as a 4 deep finite.
array of units of smaller mass than you would allow without restriction on number of units.
4 (2) Use of the formula on page_85 of TID-7016, Rev. 2, to calculate the surface density of a concrete-reflected slab 6f enriched uranium of high density indigates that the critical mass per unit area is about 5.9 gm/cm.
This is on:/ a fraction of Paxton's " safe" criterion.
- 3. : Wa's the application given an internal review in accordance with the license requirements quoted in subparagraph 6 of~ 7.3.1.1.1 and if not, why not?
4.
On what basis are the materials you plan to store equated to the material listed in Table VII of LA-3366, Rev.?
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