ML20083E920
| ML20083E920 | |
| Person / Time | |
|---|---|
| Site: | West Valley Demonstration Project |
| Issue date: | 08/14/1991 |
| From: | WEST VALLEY NUCLEAR SERVICES CO., INC. |
| To: | |
| Shared Package | |
| ML20083E893 | List: |
| References | |
| REF-PROJ-M-32 TR-IRTS-11, NUDOCS 9110030266 | |
| Download: ML20083E920 (7) | |
Text
Doc. Number TR-IRTS-11
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West Valley Revision Number -
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Demonstration Project Revision Date 09 25-91 Engineering Release #2192 TITLE: Fissile Material Mass Balance Across the LWTS Evaporator PREPARED BY
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J. J. Prowse Date Cohdant neer
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f APPROVED BY D. C. Meess Date Cognizant System Design Manager APPROVED BY
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R. A. Humphrey Date f S'IY Radiation & Sdfety Commit
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Ch rman L
APPROVED BY U S hAMA D. L. Shugars Date _)
l Quality Assuranc APPROVED BY b S Vcl2d 46C P. J. Valenti Date I'l4-9f Fac Nities Manage"r APPROVED BY
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D. J. Harward Date
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Radiation &M afety Departm/nt Manager 1
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l West Valley Nuclear Services Co., Inc.
P.O. Box 191
(N DMS0878:WP3RM WOSt Valley, NY 14171-0191 DOE Approved DW:91:0682 WV-1816, Rev.1 Dated: August 26, 1991 9110030266 910KS PDR PROJ M-32 PDR
TR-IRTS-ll O
Rev. O ELCORD OF REVISION PROCEDURE If there are changes to the procedure, the revision number increases by one.
These changes are indicated in the left margin of the body by an arrow (>) at the beginning of the paragraph that contains a change.
Examoigt
> The arrow in the margin 3 ates a change.
Revision On Rev. No.
Descrigtion of i Pace (s)
Dated 0
Original Isa All 09/25/91 O
WV-1807, Rev, 1 DMS0878:WP3RM i
a TR-IRTS-11 Rev. O MCpRD OF REVISION fCONTINUATION SHEET)
Revision On Rev. No.
Description of Chances Ptaefe)
Dated W-1807, Rev. 1 DMS0878:WP3RM 11
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TR-IRTS-11 O
Rev. O TECHNICAL REQUIREMENT IRTS-11 TITLE: Fissile Material Mass Balance Across the LWTS Evaporator CRITERIA:
Maintain the mass of fissile plutonium deposited in the LWTS evaporator to less than 450 g.
Maintain the mass of fissile uranium deposited in the LWTS evaporator to less than 1.5 kg.
UNACCEPTABLE EVENTS:
Deposition of fissile material in the evaporator in excess of criteria.
REPORTING REQUIREMENTS:
For Technical Requirement (TR) violations, WV-987,
" Initial Investigation, Oral Reporting, and written Critique of Occurrences at WVNS," shall be folloved.
O Technical Requirement IRTS-11 Fissilo Material Hans Balance Across the LWTS Evaporator Page No.
Applicability.
2 objective.
2 Definitions 2
Limiting Conditions for Operation (LCOs) 2 3
Surveillance Requirements (SEs)
Recovery Actions 3
Basis.
3 References 4
IMPLEMENTING PROCEDURES:
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TR-IRTS-11'
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Rev. 0 TECIDtICAL REQUIREMENT Fissile Material Mass Balance Across the LWTS Evaporator
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APPLICABILITY 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).
OBJECTIVE ETo 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-l.5 kg in the evaporator.
DEFINITIONS O
-Alpha Plutonium - Pu-238 plus Pu-239 plus Pu-240 plus Pu-242
. Fissile Plutonium - Pu-239 plus Pu-241 Fissile-Uranium _- U-233 plus U-235 Deposit - a solid form of salt which cannot be easily rinsed or flushed from a
-vsssel
' Total-Uranium - all Lisotopes 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 exceed once 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 fLCQal cFor the evaporator to process radioactive waste, the accumulated fissile plutonium and fissile uranium masses, as deposits in the evaporator (31017),
.mnet be less than 450 g and 1.5'kg, respectively.
12BVEILLANCE REOUIREMENTS ~ (SRs) i (Reference LCO) During processing of each batch, at least one representative
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sample of liquid from the evaporator feed tank (e.g., SD-15B or 35104) and the concentrates tank (e.g.,
5D-15A1 or SD-15A2), as appropriate, shall be taken and analyzed for alpha plutonium and total uranium. A fissile mass balance shall be calculated and documented based on these samples and the volume DMS0878:WP3RM 2 of 4 i
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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 ir. dependent evaluation shall be performed and documented to assess the mass inventory.
Proposed corrective actions shall be approved by the Radiation and Safety Committee and the actions documented prior to resumption of radioactive waste processing activities.
BASIS 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 concentrate tank, the accumulation in the evaporator is also limited to this amount.
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i During trending analysis of process data from the IRTS in early November, v
1990, it was observed that the concentration of dissolved plutonium and uranium in Tank 8D-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 issued (WVNS-90-0026, LWTS-90-0001), and the IRTS was placed in standby pending the completion of an investigation. The investigation was completed l
and it was estimated that 3591100 g total plutonium and 1,886 g (upper bound) l total uranium had resulted in a salt deposit on the surfaces of the evaporator L
(Mahoney,'1991). Acid washing the evaporator removed Pu and U and establisht 4 j_
a lower initial inventory of fissile material _ 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 450 g of fissile plutonium and 1.5 kg of fissile uraniu.a can be considered a
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" safe mass" as defined in DOE order $480.5,
- Safety of Nuclear Facilities,"
and as demonstrated by the criticality analyses which have been performed.
BEFERENCES Caldwell, J.
T.,
Letter Report, "Koff Calculations for WVNS," dated March 11, 1991, ZW:91:0031.
DOE Order 5000.3A, " Occurrence Reporting and Procesoing of Operatione Information," May 30, 1990.
DOE Oruer 5480.5, " Safety of Nuclear Facilities," September 23, 1986.
Mahoney, J.
L.,
Memo to P.
J. Valenti, "Best Estimate and Uncertainty of Pu in the LWTS Evaporator," dated May 28, 1991, CJa9120047.
Memo from Y. Yuan to C.
J.
Roberts, " Criticality Evaluation IRTS Evaporator, Final Report," dated April 11, 1991, FB191:0081.
UOR WVHS-90-0026, LWTS-90-0001, "Significant Curtailment of Operations by WVHS to Perform an Investigation of Processing."
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