ML20042C297
| ML20042C297 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/12/1982 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20042C290 | List: |
| References | |
| LSCS-PCP, NUDOCS 8203310179 | |
| Download: ML20042C297 (11) | |
Text
- . . LSCS_PCP Revi s i on 2 3/12/'d2 LaSalle County Station Process Control Program Ta,b1e of Contents Pace ,
- l. Scope 2
- 11. LSCS Solidification System Description 2 lil. Cha'racteristics of LSCS Solidification System Feeds 2 IV. Solidification Formulas ~ 3 V. Administrative Controls on LSCS Solidification 4 VI. Control of Process Parameters ilhich Could Affect LSCS 5 Solidification.
Vll. Shipment of Solidified Vaste 7 Appendix A - LSCS Solidification Formulas 8-Appendix B - LSCS Procedures Which implemant the PCP. _11 s
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8203310179 820329
Revision 2 3/32/82 2
- 1. Scope A. The LaSalle County Station Process Control Program (LSCS PCP) describes the administrative and process controls on the radioactive waste solidification system which provide reasonable
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assurance that the LSCS system is operated to produce solidified waste with no free-standing water. The LSCS PCP is implemented by the LSCS Operating Department.
II. LSCS Solidification System Description.
A. LSCS utilizes a permanently installed radwaste solidification system supplied by %:ock Equipment Company. This system has been designed with numerous features to provide process control for reasonable assurance that waste is solidified with no free standing water. The " Process Description" section of Stock E_quipment Co. Solid Radwaste_ System Topical Regort,SRS-001-NP, March 1979, gives a general description of the operation of the Stock Solidification System and notes the various process control features. The solidification system is operated by LSCS personnel.
111. Characteristics of LSCS Solidification System Feeds. Five types of waste are solidified in the LSCS system.
A. Spent Resin Tank (1). The spend resin tank receives exhausted ion exchange bead resins from the condensate polishing demineralizers, waste denineralizers, floor drain demineralizers, and chemical waste demineralizer. Resins are allowed to settle in this tank while excess water is decanted. Settled resins are discharged to the solidification systen af ter appropriate recirculation.
B. Waste Sludge Tank (1). The Waste Sludge Tank receives backwssh from the waste collector filters, fuel pool filter-demineralizers, and bottoms from various liquid radwaste collector a~' feed tanks. The sludges are allowed to settle in this tank while excess water is decanted. Settled sludge is discharged to the solidification system. The sludge consists primarily of diatonaceous earth and powdered ion exchange resin.
C. URC Sludge Tank. The URC Sludge Tank. receives solids from the ultrasnonic resin cleaner (URC) backwash. The sludge is allowed to settle while excess water is decanted. Settled sludge is discharged to the solidification system af ter appropriate recirculation. The sludge consists primarily of piping corrosion products and resin fines.
D. Reactor Water Cleanup (RWCU) Phase Separator Tanks (4). The four phase separator tanks collect, settle and hold for decay sludge from the RWCU filter-denineralizer backwash. Excess
- water can be renoved from the tanks via decanting. Settled sludge is discharged to the solidification system after recirculation. The. sludge consists primarily of powered ion exchange resin and organic-inert (e.g. , Solka-Floc) filtering redia.
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E. Conce'nt rator Was te Tanks (2,) . The two Concentrator Waste Tanks receive concentrates from the floor drain and chemical waste concentrators, and lesser quantities of concentrates from the laundry reverse osmosis unit. The chemical wastes concentrates consist of deep bed demineralizer regenerant wastes, concentrated to approximately 25% by weight, Na 2 S04. The floor drain wastes consist of floor drains concentrated to approximately 10% total solids by wieght. The laundry reverse osmosis concentrates consist primarily of detergent solutions concentrated to approximately 4% by weight total solids.
IV. Solidification Formulas.
A. Formula Development. Stock Equipment Company has performed extensive testing of BWR waste solidification with cement.
Stock has developed specific formulas for solidification of these wastes in the Stock systems. The formulas have been pretested prior to use at LaSalle.
B. LSCS Solidification formulas. The LSCS operating procedures listed in Appendix A describe specific formulas for each type of LSCS waste. The formulas include the required amount of cement, the amount of waste, slurry settling and maxing times, and in-drum mixing times. Process control parameters for each drum of waste are recorded and reviewed to verify that the proper solidification formulas have been used.
C. The formulas for LSCS spent resin, waste filter sludge, URC sludge and filter-demineralizer sludge wastes should femain constant. When these formulas are initially used on actual LSCS wastes, the initial waste drums will be opened and visually inspected to assure proper solidification wiht no free-standing water. The formulas will be modified if necessary to provide solidification. Thereafter, waste drums will be' periodically opened and inspected to verify solidification.
D. The LSCS operating procedures provide for the sampling and analysis of each batch of concentrator waste. The solidification formulas for each ba'tch of waste will be based on the total solids content of the batch sample. Graphs and instructions are provided in the operating procedures. When a specific formula is first used to solidify a-batch, an initial waste drur will be opened and visually inspected to verify solidificatici with no free-standing water.
~E. New LSCS solidi fication formulas may be . developed and added to the operating procedures to optimize drum radiation levels or waste processing or to accomodate changes in the waste stream characteristics. For new formulas, initial waste drums will be opened and inspected to verify solidification with no free-standing water.
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F. The cu-rent LSCS solidification formulas are provided in Appendix A. The formulas in Appendix A have been determined by Stock Equipment Company to provide solidification within the following tolerances for v.aste and cement quanti ties; Cement t 5%
Sludges t 10%
Evap. Vastes t 5%
Should variations'in waste and cement occur for the same drum, the tolerances listed above are half of that specified.
V. Administrative Controls On LSCS Solidification.
A. Use of Procedures. Written station procedures are used to implement the LSCS PCP. The station procedures address the following aspects of implementation:
- 1. Step-by-step directions are provided for operation of the solidi fication system.
- 2. Solidi fication Formulas are provided for each LSCS Waste Stream.
3 Each waste container is assigned a unique identification number. Operational parameters are recorded for each y container.
. 4. The container operational parameters are reviewed to verify that the drumming formula was followed.
5 Waste containers are periodically inspected to verify solidi fication with no f ree-standing water.
15 . Concentrator Waste Tanks are mixed for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> to provide samples for pH and solids content.
B. Station Procedures which implement the Process Control Program are listed in Appendix B.
C. At least:one batch of solidified waste in ten batches of each waste type will be tested to verify sol'idification. The test will consist of opening a container at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after mixing and inspecting for the presence of free-standing water.
If any. visible f ree-standing water .is detected that cannot be attributed -to operator error or system malfunction, further solidification of that type of waste will be suspended-until the P,rocess Control-Program is modified and proper waste solidification is verified. Inspections.will be performed prior to shipment of the solidi fied ' waste.
'D.' If the initialf test of a batch falls to verify solidification, each succeeding batch of the same type 'of waste will be tested ~
until 3 consecutive batch tests verify solidification without.
free-standing water.
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E. For the Spent Resin, URC Sludge, and' Waste Sludge waste streans a batch is defined as the contents of one of the waste tanks when solidification of the contents commences and for 30 days thereafter. These tanks continue to receive water and waste while solidification is in progress. Since water content of these wastes is controlled in the decanting stations and other waste characteristics are not expected to change significantly, 30 days is chosen as a conservative interval.
F. For the Phase Separator and Evaporator Waste streams a batch is defined as the contents of one isolated waste tank.
VI. Control of Process Parameters Which Could Affect LSCS Solidification.
A. Cement Type. Type 3 Portland Cement is used as the solidification agent at LSCS. The cement is certiffied by the suppliers to meet the specifications of ASTM C150-1980. Plant inspection of cement shipments will verify proper certification.
B. pH of Waste Stream. Stock Equipment Company has determined that extreme (greater than 10) pH values of waste can adversely affect solidi fication.
- 1. The Concentrator Waste Tanks receive wastes from the evaporators and reverse osmosis unit that may exceed a pH value of 10. The evaporator waste tank pH is monitored by sampling and analysis. The waste pH may be adjusted if a waste batch is found to have improper solidification.
- 2. The other LSCS Waste Streams consist of slurries. The pH of these waste streams is not expected to exceed 10 and is not normally monitored.
C. Solids Concentration and Type of Waste
- 1. The LSCS operating procedures provide formulas for each specific waste stream. The actual parameters for the Waste containers are reviewed to verify that the correct formulas are used for the type of waste solidified.
- 2. Evaporator Wastes batches are sampled and analyzed. The formulation used to solidify a particular batch is based on the measured batch solids content. When a particular formulation is first'used an initial container of solidified waste is inspected to verify solidification without freestanding water.
3 The other LSCS waste streans are slurries. The decanting tarks are utilized to control solids concentration.
D. Siurry Settling tines. In order to obtain a uniform bed-of-solids in the decanting tanks and consistent slurry concentrations the.LSCS operating procedures provide specific settling times for'each type of waste. -
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E. Drum Mixing Times. The LSCS operating procedures specify drum mixing times for each waste type. The mixing times are automatically controlled by adjustable timers. Mixing times are recommended by Stcck Equipment Company for the pretested formulas.
F. Solidification (Set) Time. Stock Equipment Company has recommended 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> as a minimum set time to assure complete solidification of non-borated wastes. LSCS does not expect to ship waste containers -
within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of solidification because of the LSCS capacity to store approximately 2000 drums.
G Concentrator Wastes Temperatures. Stock Equipment Company has recommended a maximum concentrator wastes temperature of 160UF to preclude possible overpressurization of the solidified containers. At LSCS Concentrator Vastes temperature is monitored with a thermocouple. In the event of waste temperatures exceeding 160 F the waste metering pump is tripped.
H. Presence of 011 In Waste Streams. Solidification tests performed by Stock Equipment Company invol ing typically encountered oil types indicated that up to 24 concentrations (by weight) do not adversely affect solidification. LSCS does not expect oil contamination of any waste stream to exceed 2% by weight. Solidified LSCS waste is periodically inspected to verify solidification.
I. Maintenance of Cement Duality During Storage. At LSCS, cement p used for solidification will be stored indoors in an enclosed steel silo. The storage area temperature will be maintained at 60-100 F range by plant ventilation. Indoor storage provides reasonable assurance that cement quality will be mainthined.
J. Type and Condition of Solidification Containers. New solidification drum shipments are inspected to' verify that certificiations to DOT 17C specifications are included with the shipments. The inspection may include. verification that drum wall thicknesses are within tolerance and that seams are tight. Prior to loading .with cement and waste, each drum is inspected to verify the absence of dents and holes and the presence of the' required " Radioactive LSA" markings.
The inspection also verifies that a 4-inch cap and gasket are installed.
Vll . Shipment of Solidified Waste A. Isotopic Analysis'of Resin. Each resin source (tank) is sampled and= isotopically analyzed for gamma emmitters. ' Based upon-this analysis, the activity (uCi/ gram) and % abundance of each isotope' in the resin are determined.
S. -Curie Content of Solidified Waste. The Curie content of each processed barrel will be determined using conservative calculations
' which relate.the average barrel surface area dose rate to the total activity.
LSCS PCP 1 Revision 2 l 3/12/82 j 1
7, C. Prior to shipping, drums are inspected for renovable contamination and general condition. Drums found to be damaged during handling will be placed. in 70 galloa drums for shipment.
D. Expended cartridge - type filter elements will be dried and shipped as Dry Active Wasts (DAW).
E. Fsee-standing water 4-111 be removed from partially solidified drums prior to shipment.
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Appendix A LSCS Solidification Formulas
- 1. Spent Resin fank 10% free-standing water in decant tank. .
Slurry settling time 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
Drum Mixing. Times 10 minutes first time and 5 minutes second time. ,
40 gallons'of' waste, '
240 lb. Type 3 Cement.
Fihal Drum weight 607 lb'.
- 11. Waste Sludge Tank 10% free-sta.nding water in decant tank.
Slurry settling time 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
Drum Mixing Times 10 minutes first time and 5 minutes ,
second time.
36.5 gallons of waste.
296 lb. Type 3 cement.
Final Drum Weight 608 lb.
Ill. URC Sludge Tank e
10% free-standing water in decant tank.
._ Slurry settling time 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
Drum Mixing Times 10 minutes first time and 5 minutes. second time.
40 gallons of waste.
240 lb. Type 3 Cement.
Final Drum Weight 607 lb.
IV. RWCU Phase Separator _ Tanks 10% f ree-standing water' in decant tank.
Slurry Settling Time 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
Drum Mixing Times 10 minutes first time and 5 minutes second time.
296 lb. Type 3 Cement.
36.5 gallons waste.
-Final Drum Weight 608 lb. -
V. Concentrator kaste' Tanks Drums Mixing Times 10 minutes first-time and 5 minutes second time. ,
Quanti ty of Type 3 Cement per Attached -graph.
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-Quantity of-Waste pe'r attached graph.
Figal Drum Weight Variable h-i ____m
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LSCS PCP AT~ACit: cit A Revisien 2 3/12/82 CONCENTRATED WASTE DRUMMING 10 FORMULA GRAPH Li,- . . .
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11 APPENDIX B
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- l. LSCS Procedures Which Inplement the LSCS-PCP
-1. ~. LOP-WX-01, Drum Handling Bridge Crane Operation l
- 2. LOP-WX-02, _ Decanting Station Operation l 3 LOP-WX-03, Drumming Unit Operation
- 4. LOP-WX-04, Establishing a Concentrated Waste Tank Transfer Loop.
- 5 LOP-WX-12, Establishing a RWCU Phase Separator Tank Transfer Loop.
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- 6. LOP-UX-14, Cement Day Tank Filling and Drum Cement Loading.
7 LOS-WX-SR1,. Verification of Radwaste Solidification.
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L B. LOP-WX-16, Drum Labeling and Inspection Station Operation.
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