ML20248E635
| ML20248E635 | |
| Person / Time | |
|---|---|
| Site: | Westinghouse |
| Issue date: | 05/29/1998 |
| From: | Wiliams D WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Harry Felsher NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9806030389 | |
| Download: ML20248E635 (3) | |
Text
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'"Ypn415~5390 Please forward a copy of the attached memo to Harry Felsher at NRC HQ. It is per his request S/15/98. It is for his review of an FNMC revision,I think. Contact Dan if any questions arise.
D. W. Williams, Senior Engineer cc:
Dan Norin Wilbur 1
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- 2r 0 May 15,1998 RA-DWW-98-013 To:
CSA File (Miscellaneous - Luundry) cc:
W. Goodwin W. Dougheny N. Kent W. Newmyer T.Shannon
Subject:
Criticality Safety Basis for Laundry This memo provides documentation of the criticality safety basis for laundry at the CFFF.
Criticality is judged to be not credible in dirty laundry for the following reasons:
a) Protective clothing used at CFFF has no pockets to collect SNM.
b) Chemical area workers deposit used protective clothing in containers stationed away from substantial quantities of SNM.
c) Over the period of many years, each bag oflaundry has been assayed singly or in groups of two. The levels of SNM are consistently below I gram U-235 per bag.
[The calculated factor from a test in 1997' was 0.02 grams U-235 per kg, which equates to 0.36 grams U-235 per approx. 40 lb bag.]
d) Laundry is sent out for cleaning 2-3 times per week. Therefore the amount accumulating for shipment does not normally exceed 40-50 bags.
e) Laundry could be piled / stored in an unlimited fashinn and still not present any adverse condition for criticality (see item 6 below).
Because criticality is not credible, double contingency is not applicable and a fault tree is not required.
Other items of notes are as follows:
- 1) Dirty laundry is removed from the change moms each shift by use of an open mesh cart.
- 2) Laundry is collected in the women's change area adjacent to SE Expansion prior to shipping.
- 3) Specifically approved solid vin,1 carts are used to move diny laundry the short 2
v distance from the collection point into a trailer at Dock 6 for shipment.
Attachment to Lener NRC 059, R. A. Williams to Michael F. Weber, USNRC, Changes to FNMC 2
Plan - Revision 28, December 18,1997.
Memo RA DWW-98 008, D. Williams to Config. Contml File 96 205, Laundry Cans at dock 6 (CC #
2 96-205),3-27-98.
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' ( SENT BY: WESTINGHOUSE - GFD
- 5-29-98 : 10.:04 : WESTINGHOUSE - GFD-
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- 4) Luundry is generated at the rate of approx. 20 bags per day.
- 5) Laundry is shipped 2-3 times per week.
- 6) Although 55-gallon drums are not used for diny laundry, there is an existing basis for drum storage $ hat allows arrays with no spacing required if the drum content is s 104 t
grams U-235. Laundry bag size would allow 2 bags per drum, very far below the limit for unlimited arrays. Therefore there are no criticality limitations for piling / storage of dirty laundry bags.
h D. d. Colwell, rincipal Engineer D. W. Williams, enior Engineer Measurement Control N
Criticality Safety
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' Independent Review and Ippmy'al W. L. Goodwin, Manager, Regulatory Affairs
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' Criticality Safety Evaluation of the Storage structures,400/97.