ML20082K482

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Fissle Matl Mass Balance Across Lwts Evaporator
ML20082K482
Person / Time
Site: West Valley Demonstration Project
Issue date: 08/14/1991
From: Humphrey R, Meess D, Prowse J
WEST VALLEY NUCLEAR SERVICES CO., INC.
To:
Shared Package
ML20082K476 List:
References
REF-PROJ-M-32 TR-IRTS-11, TR-IRTS-11-R, TR-IRTS-11-R00, NUDOCS 9108300070
Download: ML20082K482 (8)


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ATTACHfENT D Doc. Number lF-IF".E-11 West Valley Revision Nu:nber 0 Demonstration Project Revision Date TITLE: Fissile Material Mass Balance Across the LWTS Evaporator O h Shffj' PREPARED BY /h /' # J. J. Prowse Date '

Cogjnaant pineer D. C. Meess Date I _!

APPROVED BY Cognizant System Design Manager APPROVED BY ./ - 1 _,wM R. A. Humphrey Date ; '

Radiation & S,5fety Commirthe Chai rman (/

l i APPROVED BY (/  ! hu4 D. L. Shugars Date L i

I Quality Assurane  !

APPROVED BY S Ve$d /9 GC ~

P. J. Valenti Date ?-l4-9 I l FacMities Manager APPROVED BYp < sf !e D. J. Harvard Date / f/

Radiation fiafety Department s 1:anager West Valley Nuclear Services Co., Inc.

P.O. Box 191 l DMs0878:WP3RM West Valley, NY 14171-0191 VN-1816, Rev.1 c,iog300070 910W J '

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RECORD OF REVISION .

1 PROCEDURE l r

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1 TR-IRTS-11 Rev. O, Draft E .

RECORD OF REVISION (CONTINUATION SMEET)

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f- TECHNICAL REQUIREMENT IRTS-ll 4

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4 TITLE: Fissile Material Mass Balance Across the LWTS Evaporator i

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8-j - CRITERIA: Maintain-the mass of fissile plutonium deposited in the LWTS l l evaporator to less than 450 g.

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i I Maintain the mass of fissile uranium deposited in the LWTS l evaporator to less than 1.5 kg.

- UNACCEPTABLE EVENTS: Deposition of fissile material in the evaporator in ,

t I excess of criteria. .

t i REPORTINC REQUIREMENTS: For Technical Requirer.ent (TR) violations, WV-987,

" Initial Investigation, Oral Reporting, and Written Critique of Occurrences at WVUS," shall be followed.

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i Technical Requirement IRTS-11 i Fissile Material Mass Balance Across the LWTS Evaporator Page No.

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2 j Applicability . . . . . . . . . . . . . . . . . . . . . . . . . .

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Objective . . . . . . . . . . . . . . . . . . . . . . . . . . . .

[ 2 i Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .

l Limiting Conditions for Operation (LCOs) . . . . . . . . . . . . 2 Surveillance Requirements (SRs) . . . . . . . . . . . . . . . . . 3 l

Recovery Actions . . .. . . . . . . . . . . . . . . . . . . . . 3 3

Basis . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .

5 References . . . . . . . . . . . . . . . . . . . . . . . . . .

IMPLEMENTING PROCEDURES:

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.l TR-IRTS-11 i Rev. O, Draft E TECHNICAL REQUIREMENT IlHE Fissile Staterial Mass Balance Across the LWTS Evaporator APPLICAPILITY This. Technical Requirement (TR) applies to the accumulation of fissile plutonium and fissile uranium in the Liquid Waste Treatment System (LWTS) between the evaporator feed tank and the concentrates tank (specifically, the

-accumulation of fissile plutonium and fissile uranium in the evaporator),

1 OBJECTIVE To maintain a mass inventory for fissile plutonium and fissile uranium in the LWTS between the evaporator feed tank and the concentrates tank and, specifically, to limit the accumulated mass,-as a deposit of fissile plutonium to less than 450 g and fissile uranium to less than 1.5 kg in the evaporator.

DEFINITIONS- ,

Alpha Plutonium - Pu-238 plus Pu-239 plus Pu-240 plus Pu-242

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-FissiIe Plutonium - Pu-239 plus Pu-241 Fissi14 Uranium - U-233 plus U-235

-Deposit - a solid form of salt which cannot be easily rinsed or flushed from a vessel Total Uranium - all isotopes of uranium Weekly - at least once every 7. days (168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br />), but not to exceedsonce every 8 days (192 hours0.00222 days <br />0.0533 hours <br />3.174603e-4 weeks <br />7.3056e-5 months <br />)

LIMITING CONDITIONS FOR OPERATION (LCDe)

'For the evaporator to process radioactive waste, the accumulated fissile plutonium and fissile uranium masses, as deposits in the evaporator-(31017),

must-be less than 450 g and 1.5 kg, respectively.

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TR-IRTS-11' '

Rev. O, Draft.E-SURVEILLANCE REOUIREMENTS-(SRs)

(Reference LCO). During' processing of each batch, at least one representative c sample of liquid from the evaporator feed tank (e.g., SD-15B er 35104) and the concentrates tank (e.g., 5D-15A1 or 3D-15A2), as appropriate, shall be taken and analyced for alpha plutonium and total uranium. A fissile mass balance shall be calculated and documented based on these samples and. the volume processed. A cumulative fissile plutonium and fissile uranium mass inventory

.for the LWTS between the evaporator feed tank and the concentrates tank shall also be maintained.

RECOVERY ACTIONS (Reference LCO) An independent evaluation shall be performed and documented

~ to assess the mass inventory 4 Proposed corrective actions shall be approved i

by the Radiation and Safety Committee and the actions documented prior t,o l resumption of radioactive waste processing activities.

PASIS

.This TR implements the' controls needed to limit the accumulated fissile mass, ,

as a deposit, in the evaporator. By limiting the accumulated masses of fissile plutonium-and fissile uranium to less than 450 g and 1.5 kg, respectively, between the evaporator feed tank and the concentrates tank, the l accumulation in the evaporator is also limited to this amount.

During trending analysis of process data from the IRTS in early November, 1990, it was observed - that the concentration of dissolved plutonium and uranium in Tank BD-2 had increased. _On November 14, 1990, the observation was categorized as an Unusual _ Occurrence per DOE Order 5000.3A, " Occurrence Reporting and Processing of Operation Information". An Occurrence Report was l issued (WVNS-90-0026, LWTS-90-0001), and the IRTS was placed in standby I pending the completion of an investigation. The investigation was completed h- and it was estimated that 3592100 g total plutonium and 1,886 g (upper bound) 4- -

{, total uranium had resulted in a salt deposit on the surfaces of the evaporator h (Mahoney, 1991). Acid washing the evaporator removed Pu and U and establit..ad DMS0878:WP3RM 3 of 5 I

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TR-IRTS-11 Rev. O, Draft E a lower initial inventory of fissile n.aterial prior to resumption of radioactive waste processing, Criticality analyses of the evaporator were completed and indicated that the evaporator was in a highly suberitical state with 460 g fissile plutonium and 1,886 g of fissile uranium present (Caldwell, 1991; Yuan, 1991). The expected maximum liquid concentration of fissile plutonium and fissile uranium will add less than 20 g of fissile material at the maximum working volume of the evaporator during sludge wash solution processing, The limits in the LCO of 4.50 g of fissile plutonium and 1.5 kg of fissile uranium can be considered a

" safe mass" as defined in DOE Order 5480.5, " Safety of Nuclear Facili*.ies,"

and as demonstrated by the criticality analyses which have been performed.

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! REFERENCES 4-l .~

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i Caldwell, J. T. , Letter Report, "Kef f Calculations f or WNS," dated March 11,

1991, ZW
91:0031, 1

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! DOE-Order 5000.3A, " Occurrence Reporting and Processing nf Operations a '

! Information," May 30, 1990.

l DOE Order 548'0.5, " Safety of Nuclear Facilities," September 23, 1986.

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l Mahoney, J. L. . Memo to P. J . Valenti, "Best Estimate and Uncertainty of Pu in l the LWTS Evaporator," dated May 28, 1991, CJ:91:0047.

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j. Memo f rom Y. Yuan to C. J. Roberts, " Criticality Evaluation IRTS Evaporator, Final Report," dated April 11, 1991, FB:91:0081.

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UOR WVNS-90-0026, LWTS-90-0001, "Significant Curtailment of Operations by WVNS

j. to Perform an Investigation of Processing."

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