ML20082D143

Off-Gas Constituents for Waste Solidification Sys Intermediate Milestone 20-3706-001-005 for Task 1 (Draft SER on Vitrification Off-Gas Sys),Subtask a

ML20082D143
Person / Time
Site:	West Valley Demonstration Project
Issue date:	06/28/1991
From:	Nair P CENTER FOR NUCLEAR WASTE REGULATORY ANALYSES
To:	Hurt R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
Shared Package
ML20082D119	List: ML20082D143
References
CON-NRC-02-88-005, CON-NRC-2-88-5, REF-PROJ-M-32 NUDOCS 9107230221
Download: ML20082D143 (7)

Text

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/>c s Center for Nuclear Waste J}9 '% i o

Regulatory Analyses / vM' U2%

P O ORAWER 28510 a 6220 CULEBRA %AD + SAN ANTONIO, TEXAS. U S A 78226 4510 LSS

($12) 522 5160. FAX (512) 522 5155 June 28, 1991 Contract No. !!RC-02-88-005 Project No. 20 3706 001 U.S. NUCLEAR REGUIATORY COMMISSION ATTN: Mr. R. Davis Hurt Office of Nuclear Material Safety & Safeguards Fuel Cycle Safety Branch WF1 Mail Stop 6-H 3 Washington, D.C. 20555

Subject:

Waste Solidification Systems, Intermediate Milestone No, 20-3706-001-005, Off Gas Constituents

Dear Mr. Hurt:

Attached is a review of the off gas constituents that may be available in the waste solidification system for potential release to the stacks at the West Valley plant. The data presented in this submittal will be used to develop the necessary understanding of potential surges and failures of the off-gas systems.

This transmittal completes the activities associated with the subject Intermediate Milestone.

Please call me at (512) 522-5150 if you need any additional information on the subject.

Sincerely, 7

@ d.j ^--

Prasad II. Nair Program Element Manager Waste Solidification Systems GAL /t1g ec: J. Funches J. Latz

, S. Fortuna CNWRA Directors B. Stiltenpole ChvRA Element Managers S. Mearse H. Karimi, CNWRA G. Comfort G. Lamping, Consultant.

J. Swift E. Tschoepe, CNWRA S. Rowe, SwRI r

4 k.

Washington Offce

• CrystalGateway One Suite 1102 1235 Jefferson Dav:s Hwy. Mington, Virginia 22202 3293 9107230221 910716 PDR PROJ 1\V!g !

f1-32 %L PDR

. j Off-Cas Constituents for Waste Solidification Systems Intermediate Milestone 20-3706 001 005 for Task 1 (Draft Safety Evaluation Report on Vitrification Off Cas System), Subtask A June 28,1991 The Center for Nuclear Waste Regulatory Analyses (CNVRA) has initiated a program element for providing assistance to NRC in evaluating the Department of Energy's West Valley Demonstration Project (WVDP) high level waste vitrification related activities. The foremost processin6 activity of the VVDP will be vitrification of high level radioactive wastes into borosilicate glass logs. The high-level radioactive vastes to be processea at the WVDP currently are stored on site, and these wastes have 'oeen inventoried by the VVDP staff. A simplified flowsheet showing the various vaste tanks in the process is given as Figure 1. This figure represents the pathways for the waste and the various steps of the processes which must be understood before off-gas constituents can be estimated.

This letter report presents the high-level vaste analytical data obtained from the WVDP and updates the previously reported data in the NRC staff paper of March 18,1990 (Reference 1). The most recent data were provided by West Valley Nuclear Se rvices Co, Inc., on June 14, 1991, in the document titled

" Vitrification Mass Salance" (Reference 2). The data in this document are based on a 1987 inventory updated to 1990 by calculations for radioactive decay and resultant radionuclide daughters.

Data from References 1 and 2 are presented in Table I and II, respectively. Table II includes calculated values for average concentrations of various radioactive materials in stack gases along with melter inventory concentration. Values for average stack concentration were based on dilution of the total current inventory of radiation for each element in the total air throughput-(50,000 SCFM designed air flow'x 11,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> estimated processing duration). The average volume is calculated to be 9.35 x 10" mL. This technique is the same as that used in Reference 1. It is important to note that the concentration values are averages, and they do not take into account variations in those values due to fluctuations in air flow and distribution of each element in the off gases with time. Also, these calculated values are concentrations in the secck discharge, which would be expected to be diluted by the time the stack discharge mixes with ambient air to reach the controlled area boundary. For comparison, values are also given in both Table I and Table II for limits for concentrations of affluents in

-unrestricted areas, per 10 CFR Part 20, Appendix B. Table II, dated January 1, 1991.

Further updated data from vitrification mass balance studies are expected to be available in Rev. 8 of Reference 2, currently scheduled for ralease in December 1991. This report will include the latest sludge sampling and can provide the most extensive analytical data to date. The data transmitted in this report will ba checked for any changes in the off-gas constituents. All the data and analyses received to date and incorporated in this report have been from WV's measurement and sampling.

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b, _

This report ; represents the Intermediate Milestone for Task 1, Subtask A, as identified in the Center's Program Element Plan for the Waste Solidification Systems Program Element.

List of References

1. Hurt, R. Davis, " Preliminary Report of West Valley Vitrification Off Cases," 3/18/90.

2. Crocker, Robert L. , Vitrification Mass Balance, Rev. 7, transmitted to the CNVRA on 6/14/91.

_ _ _ _ . . ._ _ __ ~ .- . . . _ _ _ _ _ . _ . . . - - - _ - _ _ _ _ _ _ . _ . . . __

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Table I Estimated Inventory to Malter* (Ref.1)

Airborne 10 CFR Part 20 **

• TOTAL INVENTORY Release Rate Airborne Release Limit ISOTOPE (C1) (yci/at)

(uci/mt)

H3 0.65 7.0 x 10* 2 x 10 ' -

S.I C 14 1.3 1.4 x 10+ 1 x 10 - S Sr 90/Y 90 13.1 x 10* 1.4 x 108 2 x 10'* - I (Sr) 3 x 10 " - S (Sr)

Tc 99 14.0 1.5 x 104 7 x 104 -

S 2 x 10* -

I Ru 106/Rh 106 8.e 9.0 x 10* 3 x 10* S (Ru) 2 x 10-* I (Ru)

I 119 0.19 2.0 x 10* 2 x 10 " S 2 x 10 4 - I ca.137/Ba 137m 13.5 x 10' 1.5 x 108 2 x 10* S (Cs) 5 x 10

• 1 (Cs)

Pu 238 6.7 x 105 7,2 x 10* 7 x 10 " S 1 x 10'" I Pu 239 1.7 x 103 1.8 x 104 6 x 10 " S 1 x 10'u I Pu 240 1,3 x 10$ 1.4 x 104 6 x 10 " S 1 x lo a I Pu 241 6.8 x 10* 7.3 x 108 3 x 10-" S 1 x 10* -I Am-241 7,1 x 10* 7.6 x 10-8 2 x 10-0 -S 4 x 10" I Estimated Inventory to melter is from NRC staff paper on WDP vitrification off-gas syat'a dated March 18, 1990.

• • Dated Jan.1,1991 S Soluble I Insoluble

e Table 11 Current Estimated Inventory to Melter *(Ref. 2) 10 CER Part 20 Melter Feed

• Off Cases

• Airborne Release Rate ** Airborne Release Limit ***

ISOTOPE (C1) (C1) (uci/ar) (pCi/ar)

H-3 2.32 x 10' 2.32 x 10-* 2. 50 x 10 " 2 x 10' - S.I C-14 5.49 x 10' - 5.49.x 108 5.87 x 10 " 1 x 10' -S sr-90 6. 72 x 10* 2.24 x 10* 2.40 x 10' 2 x 10* - I 3 x 10 " -S Y-90 6.72 x 10* 2.24 x 10* 2.40 x 10' 4 x 10' -S 3 x 10* - I Tc-99 1.21 x 108 1.21 x 10' 1.30 x 10* 7 x 10* -S 2 x 10' -I Ru-106 1.57 x 10' 1.57 1.68 x 10* 3 x 10' -s 2 x 19 " - I Rh-106 1.42 x 10' 4.42 x 102 4. 73 x 10 "

See Ru-106 I-129 1.81'x 10 1.81 x 10-' 1.94 x 16-* 2 x 10 " -S 2 x 10* - I Cs-137 7.36 x 108 1.47 x 105 1.57 x 10* 2 x 10' -S 5 x 10" - I Ba-137m 6.96 x 10* 1.39 x 10' 1.49 x 10' 2 x 10' -S 5 x 10 " - I Pu-238 8.32 x 105 2.77 x 10 2.96 x IO* 7 x 10 " -s 1 x 10 '2 - I

a ..

Table II (Cont'd)

Current Estimated Inventory to Melter * (Ref. 2)

Melter Feed

• Off Gases

• 10 CFR Part 20 ISOTOPE Airborne Release Rate ** Airborne Release Limit ***

(C1) (C1) (uci/st) (pci/ar)

Pu-239 1. 6 3 x 10' S.44 5.82 x 10' 6 x 10 " -S 1 x 10 " - I Pu-240 1.19 x 10' 3.98 4.25 x 10' 6 x 10 " -S 1 x 10 " - I ,

Pu-241 8.09 x 10* 2.70 x 10' 2.90 x 10' 3 x 10 " -S 1x 10 ' - I Am-241 5. 36 x 10' l . 79 x 102 1.90 x 10' 2x 10 " -S 4 x 10 " - I Estimated Inventory to melter is from W Letter EK:89:0232 on Vitrification Mass Balance Revision Number 7 dated October 10, 1989 Airborne Release Rate is calculated based on 9.35 x 10"mL total flow volume

• • • Dated Jan. 1, 1991 S - Solubla 1 - lusoluble 1

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