ML20009F130

Responds to Requesting Addl Info Re Application to Amend License SNM-1067 Covering Pellet Storage Shelves. Forwards Addl Criticality Analyses Demonstrating That Spacing Boundary Is Conservative

ML20009F130
Person / Time
Site:	07001100
Issue date:	06/01/1981
From:	Lichtenberger ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:	Page R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
19210, NUDOCS 8107290235
Download: ML20009F130 (4)

Text

_ _ _ _ _ _ _ _ _ - _ -

4 C-E Power Systems Tel 203/688-1911

[]- gg y Combustion Engineering. inc.

Telex 9 9297 1000 Prospect Hill Acad

[

Windsor. Connecticut 06095 D

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FW W

.m ab E GN-SJ "g,

e y

w1 ense SitM-1067 June 1, 1981 occxctro

. et 70-1100 U5?OC

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JUN 1 1 1981 > '9

{

U. S. fluclear Regulatory Commission rm Washington, DC 20555 tat ucuos g

Docxtr can

'd Attention: Mr. R. G. Page, Acting Chief

's Uranium fuel Licensing Branch sc Division of Fuel Cycle & flaterial Safety

{

Reference:

Letter from Mr.11. V. Lichtenberger to Mr. R. G. Page, dated March 18,1981; Amendment Application - Pellet Storage Shelves

Dear Mr. Page:

In response to comments made to our amendment application referenced above by f1r. fl. Ketzlach of your staff, we are hereby submitting the attached as a sup-plement to the original application.

The additional criticality analysis plus the resolution of other comments are submitted for your approval in the following page changes:

Add Page Delete Page C-16 Rev. 2, 6/1/81 C-16, Rev. 1, 3/18/81 D-18, Rev. 2, 6/1/81 D-18, Rev. 1, 3/18/81 D-19, Rev. 2, 6/1/81 D-19, Rev. 1, 3/18/81 Very truly yours, (tc r aWA e

H. V. Lichtenberger Vice President-fluclear Fuel fluclear Power Systems-Manufacturing HVL/GJB/ssb Enclosures i,

L

,..at$

eb) ha 8107290235 010601 PDR ADOCK 07001100 C

PDR 19MO l

u I

F 6.2 Pellet Storage Shelves Stee'l shelves (W.S. P-22 and P-ll4) are provided for pellet storage. The shelves are three high. They have a width of 30" and are limited to a slab thickness of 4.0 inches.

The slab thickness of 4.0" is assured by limiting the number of fuel pellet trays stacked at any position.

The entire storage array is covered by a sheet metal top which would prevent significant moderation of the array from discharge of the overhead sprinkler system. Water fire-fighting is not permitted in the pellet shop. The local fire department. has been instructed that only dry chemical extinguishing tech-niques are permitted here and a 24-hour guard service (and one vehicle access gate only) assures that this requirement is strictly enforced.

Criticality Safety Analysis The following conservative assumptions were incorporated into the calculational model of the pellet storage shelves:

1)

Each shelf was assumed to hold a 4.0 inch thickness of UO optimum moderation and maximum enrichment (4.1 wt.% U235)2 at

2) The system was assumed to be infinite in the horizontal plane.

3) Variable density external water Irist was introduced to determine peak reactivity.

The KENO-IV Code with 16 group Hansen-Roach cross sections was used to deter-mine the reactivity of the pellet storage shelves under various conditions of moderation. Optimum moderation of the fuel occurred at a concentration of 2.4 g U/cc in water, assuming no external water mist. The peak reactivity of the system, Keff = 0.9313 1 0.0044 occurred at an external water mist density of 0.025 gm/cc which is higher than one could attain from fire fighting equipment v a sprinkler system. The criticality safety analysis demonstrates that the spacing boundary can be located 60 inches from the front of the shelves.

l Note:

In the determination of cross sections for the pellet-water mixture, a volume homogen1zation procedure was employed which is non-conservative for low enrichment fuel.

However, it will be shown that the non-conservatism of this approximation is more than offset by the conservative assumption that the pellet-water mixture is at an optimum fuel concentration of 2.4 gm U/cc.

For actual loading of the trays, the pellets pack to an average density of 5.95 gm UO /cc (5.24 gm U/cc), with 2

License No. SNM-1067, Docket 70-1100 Revision:

2 Date: 6/1/81 Page: C-16

License No. Stif t-1067, Docket 70-1100 Revision:

2 Date:

6/1/81 l

i Page:

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