ML20062F291
| ML20062F291 | |
| Person / Time | |
|---|---|
| Site: | 07000157 |
| Issue date: | 11/14/1990 |
| From: | Fonken G TEXAS, UNIV. OF, AUSTIN, TX |
| To: | Haughney C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9011270192 | |
| Download: ML20062F291 (3) | |
Text
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y EXECUTIVI YlCE PRESIDENT AND PROVOST hr
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THE UNIVERSITY OF TEXAS AT AUSTIN h, %hf) MainBuilding20! Aniv. Texas 78712'(312)471-4363
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November 14, 1990 Mr.-Charles J. Haughney, Chief Division of Industrial and Medical Safety Office of Nuclear Material Esfety and Safeguards U. S. Nuclear Regulatory. Commission-Washington, D. C. 20555 REF: Docket 70-157, License SNM-180 10CFR 70.25 (a) Certification of Funds
.for Decommissioning
Dear Mr. Haughney:
The following information is'being provided pursuant'to-10CFR 70.25(c)2.
The - University of Texas at ' Austin has-determined that the estimated' cost of decommissioning SNM-180 license activities is $20,000.
This ; cost represents 11ess than 0.01 percent of -the annual. operating budget.
Certification is hereby provided that-.the necessary funds will be made available at the time o f d e c o m m i s s i o n i n g ','
Furthermore, no provision for adjusting cost estimates during-the facility life are considered necessary or-practical, considering the total dollar cost and the. amount,of available operating funds (see 10CFR 70.25 (e) ).
Sincerely'yours,
'G.-'J. Fonken Executive-Vice President and: Provost'
.GJF/bp cc:
Dean Herbert H. Woodson Professor Kenneth Diller.
Professor Bernard Wehring l
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$NM License #SNM 180 Decommissioning Requirements Materials on the license are PuBe neutron sources and a suberitical assembly of 20% uranium 235 enrichment. Three of the license materials are plutonium beryllium sealed sources that are exempt from the regulation requirements. The disposal requirements for these sources will most likely require a return to the Department of Energy to allow recovery of the materials prior to ultimate disposal.
only the uranium 235 and any byproduct material of the suberitical assembly's operation require consideration for decommissioning.
The following-calculation indicates that the material requires a fund of $750,0001 These decommissioning requirements of 10CFR part 70 represent unacceptable conditions for this SNM 180 license materials.
10CFR 70.25(a) decision limit 10' factor 10CFR 20 appendix C uranium 235
.01 ycurie 10' x.01x10'
.001 curie 40CFR 173.434 item 20 10** curie / gram 10CFR 70 license material 470 grams 470 grams x 10** curie / gram..0047 curie
.0047 curie
.001 curie - 4.7 times decision level The physical form of the suberitical assembly material is uranium dioxide uniformly dispersed in a matrix of polyethylene.
License conditions set by NMSS require that the assembly be examined for " leakage" of alpha activity by the same criterion as a sealed PuBe neutron source. Yet the assembly does not meet any other criteria for consideration as 'a sealed source.
The result of this type of testing would also set a limit on the amount of potential byproduct material contamination. Any beta contamination that occurs during i
use of the assembly materials would be either taken care of subsequent to each l
use of the assembly or discovery by radiation program surveys.
The only contamination will be the assembly, possibly materials that are in contact with the assembly, and experiment materials that are part of the assembly applications.
The quantity of byproduct material is not considered a factor in the decommissioning since the cost of disposal will be set by the volume, waste classification and total curies.
The issue of byproduct material within the assembly has no effect on the-conclusion.
Direct disposal of this assembly would be the minimum charge for one barrel (55 gallon) with no surcharge for activity, and ignores the recovery value of the 470 grams of uranium 235 isotope for which the market is unknown.
However, requirements for the recovery of uranium 235 as for plutonium 239 in sealed sources may also prevent direct disposal.
L Total decommissioning costs for use of the suberitical assembly depend on the radioactive waste site disposal charges and transportation charges to the
t e
Page 2 disposal site.
An additional cost will be the radiation survey for alpha, or beta, contamination in the immediate area of the raterials use, an area of 84 m. Thecostofdisposal,transporg,andsu'.veyisthenarbitrarilysetat
$10,000 3 The cost is figured at $20/m area cleanup, disposal cost of 6200 $/m of waste, and a 20% allowance for 6tansportation costs.
The estimated amount of a fund for decommissioning the SNM 180 license activities represents 0.002% of the annual operating budget of The University of Texas at Austin.
.t91A1 Cleanup 84m*
$20/m'
$1680 Disposal charge
$6200/m,
$1280 (1996 $'s, 1 55 gal, barrel)
Transportation
$ 256 (20% of disposal)
Contingency (escalation)
$6784
$10000 License SNM 180 Materials Decommissioning Requirements material erams isotone 2 grams comment 1 curie PuBe source plutonium 16 239 15 sealed (exempt) l 2 curie PuBe source plutonium 32 239 30 sealed (exempt) 5 curie PuBe source plutonium 80 239 74 sealed (exempt).
Suberitical assembly uranium 2375 235 20 470 unsealed f
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