TABLE 4.1 Material Balance Estimates (g) for Selected Components of EBR-II Driver Fuela

 

U

Pu

Np

Na

144Ce

137Cs

136Ru

125Sb

Tc

Input

Electrorefiner feed

427 × 103

1509

156

9801

26

1031

5

4

757

CP/CF feedb

610 × 103

0

0

1

0

0

0

0

0

Total input

1037 × 103

1509

156

9802

26

1031

5

4

757

Output

MWFc

25 × 103

165

12

723

2

62

4

2

660

Uraniumd

955 × 103

4

3

3

0

0

0

0

2

Drosse

14 × 103

0

0

0

0

0

0

0

0

CWFf

38 × 103

1248

124

7894

17

722

0

0

0

Otherg

8 × 103

5

2

309

0.1

5

0

0

4

Total output

1039 × 103

1422

140

8929

19

789

4

2

666

a SOURCE: R.D. Mariani, D. Vaden, B.R. Westphal, D.V. Laug, S.S. Cunningham, S.X. Li, T.A. Johnson, J.R. Krsul, and M.J. Lambregts, Process Description For Driver Fuel Treatment Operations, ANL Technical Memorandum No. 11, Argonne National Laboratory, Argonne, IL, Table 23, p. 35.

b Depleted uranium added in cathode processor (CP)/casting furnace (CF) operations.

c Cladding hulls (to be converted to metal waste form, MWF).

d Uranium ingots for interim storage.

e Dross from cathode processor (CP)/casting furnace (CF) operations.

f Material remaining in electrorefiner salt (to be converted into ceramic waste form CWF).

g Material remaining in electrorefiner holdup, cadmium pool, and plenum sections.

forms must therefore be assessed within this system context of overall repository safety. The committee recognizes that it is not waste form performance per se, but rather the safe performance of the integrated system of engineered and natural barriers, that must be demonstrated. It is within this system context that the committee has evaluated ANL’s progress toward obtaining the necessary DOE-RW acceptance of EMT waste forms, qualifying them for final disposal in a geologic repository in the future.

To date, both commercial SNF and vitrified defense HLW have been subjected to detailed characterizations of their radionuclide-release performance under expected repository conditions.3 The resulting data have been used to guide isolation strategies. These data also have led to an initial design of engineered barrier systems (EBS) and in the assessment of safety and viability of waste forms for placement in a geologic repository.4

Acceptance of DOE SNF and HLW waste forms by DOE-RW for final geological disposal involves many characterization and testing issues with respect to quality assurance and performance. To ensure a coordinated effort between DOE-RW and DOE’s Office of Environmental Management (DOE-EM) to resolve such issues, a memorandum of agreement (MOA) was issued5 that establishes the terms and conditions under which DOE-RW will permit DOE-EM to dispose of its SNF and HLW. The MOA identifies the responsibilities of DOE-RW and DOE-EM for data on transportation, storage (if needed), safeguards, characterization, and final acceptance for disposal of these materials. Responsibility to treat the EBR fuel rests with DOE-NE, but the ultimate disposition of this treated EBR-II fuel and any HLW generated is the responsibility of DOE-EM. Hence, the committee presumes that the waste qualification activities of the EMT program will be guided and governed in the post-demonstration period by the MOA.

3  

U.S. Department of Energy, Mined Geologic Disposal System Waste Acceptance Criteria Document, B00000000-01717-4600-00095 REV 00, TRW Environmental Safety Systems, Inc., Las Vegas, NV, 1997, pp. 5-1–5-8.

4  

U.S. Department of Energy, Mined Geologic Disposal System Waste Acceptance Criteria Document, B00000000-01717-4600-00095 REV 00, TRW Environmental Safety Systems, Inc., Las Vegas, NV, 1997.

5  

U.S. Department of Energy, Memorandum of Agreement for Acceptance of Department of Energy Spent Nuclear Fuel and High-Level Radioactive Waste between the Assistant Secretary for Environmental Management (EM) U.S. Department of Energy (DOE) and the Director, Office of Civilian Radioactive Waste Management (RW) U. S. DOE, Washington, D.C., September 1998.



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