ML20141M908

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Forwards Criticality Analysis of BU-7 Container for Theoretical Density Pellets, Per NRC Request for Reevaluation W/Pellet Safety Demonstration Based on Mass Limit Instead of Bulk Density
ML20141M908
Person / Time
Site: 07109019
Issue date: 02/07/1986
From: Winslow T
GENERAL ELECTRIC CO.
To: Macdonald C
NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
Shared Package
ML20141M909 List:
References
26442, NUDOCS 8603030041
Download: ML20141M908 (1)


Text

7/- 90/9 RETURN TO 396-SSFOl' GENERALh ELECTRIC NUCLEAR FUEL MANUFACTURING DEPARTMENT GENERAL ELECTRC COMPANY + P O. BOX 780

  • WLMINGTON. NORTH CAROL:NA 28402 February 7, 1986 Mr. Charles E.

MacDonald, Chief a;

Transportation certification Branch Division of Fuel Cycle & Material Safety U.S. Nuclear Regulatory Commission il Washington, D.C.

20555 3

Dear Mr. MacDonald:

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Subj ec t.:

NRC Certificate of Compliance USA /9019/AF

References:

1) "The General Electric Mode] BU-7 Uranium Shipping Container - Criticality Safety Analysis", 02/74, R.

Ar t ig as.

2) " Criticality Safety Analysis of BU-7 Shipping Container for 002 Po wd e r ", 03/06/80, W.C.

Peters.

Your office has requested that General Electric Nuclear Fuel Manufacturing Department (NFMD) re-evaluate the BU-7 criticality analysis in order to base the pellet safety demonstration on mass limit instead of bulk density.

In response, we are provid ing the enclosed " Criticality Analysis of BU-7 Container for Theoretical Density Pellets", dated January 24, 1986.

This report demonstrates safety for the normal and accident conditions up to 204 kgs of UO2 pellets within a single BU-7 inner container provided the H to U ratio does not exceed 0.45 and the enrichment is not greater than 4.025%.

Although this new analysis removes the bulk density limit for contents that otherwise satisfy the original analysis [see references (1) above], it does not affect the requirements associated with the increased moderation limit of the 3/6/80 criticality safety analysis (see reference (2) above] of the BU-7 for UO2 powder that allows for increased binder and poreformer content of GECO powder.

General Electric Company personnel would be pleased to discuss this with you and your staff as you may deem necessary.

Sincerely, e

5 b I.L L ULjuhj l,Ilj Y GENERAL ELECTRIC COMPANY

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