ML20039G570
| ML20039G570 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 07/29/1981 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20039G568 | List: |
| References | |
| PROC-810729-01, NUDOCS 8201180437 | |
| Download: ML20039G570 (6) | |
Text
Revision 0 7/29/81 L S 2lle County Station Process Control Program Table Of Contents Page I.
Scope 2
II.
LSCS Solidification System Description 2
111. Characteristics of LSCS Solidification System Feeds 2
IV.
Lolidification Formulas 3
V.
Administrative Controls on LSCS Solidification 4
VI.
Control of Process Parameters Which Could Affect LSCS 5
Solidification.
Appendix A - LCSC Solidification Formulas 7
Appendix B - LSCS Procedures Which Implement the PCP.
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8201180437 820113 PDR ADOCK 05000373 PDR A
i I.
Scope A.
The LaSalle County Station Process Control Program (tSCS PCP) describes the administrative and process controls on the radioactive waste solidification system which provide reasonable assurance that the LSCS system is operated to produce solidified waste with no f ree-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 Stock 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 Equipment Co. Solid Radwaste System Topical Report 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.
III. Characteristics of LSCS Solidification System Feeds. Five types of waste are solidified in the LSCS system.
A.
Spent Resin Tank (1). The spent resin tank receives' exhausted ien exchange bead resins from the condensate polishing demineralizers, waste demineralizers, 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 system af ter appropriate recirculation.
B.
Waste Sludge Tank (1). The Waste Sludge Tank receives backwash from the waste collector filters, fuel pool filter-demineralizers, and bottoms from various liquid radwaste collector and 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 diatemaceous" earth and powdered ion exchange resin.
C.
URC Sludge Tank. The URC Sludra Tank receives solids from the ultrasonic 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.
7 Reactor 'later Cleanup (RUCU) Phase Separator Tanks (4). The f cur chase cenarator tanks collect, settle and hold for decay s hut e c +, WCU filter-demineralizer backwash.
Excess f ro.n the tanks via decanting.
Settled catc
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- Mefcerf.,n syste-c er recir~'l
'on.
1 LSCS PCP Revision 0 7/29/81 3
The sludge consists primarily of powered ion exchange resin and organic inert (e.g., Solka-Floc) tiltering media.
E.
Concentrator Waste Tanks (2). The two Concentrator Waste Tanks receive concentrates from the floor drain and chemical waste concentrators, and lesser quantities of concentrates from -he lacudry reverse osmosis unit.
The chemical wastes concentrates consist of deep bed demineralizer regenerant wastes, concentrated to approximately 25% by weight Na,S0.
3 The floor drain vastes consist of floor drains concentrated to approximately 10% total solids by weight.
The laundry reverse osmosis concentrates consist primarily of detergent solutions concentrated to approximately 4% by weight total solids.
IV.
Solidif1 cation Formulas.
A.
Formula Development. Stack 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 mixing 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 remain constant. When these formulas are initially used on actual LSCS wastes, the initial waste drums will be opened and visually inspected to assere proper solidification with no free-standing water. The formulas will be modified if necessary to provide solidification. Thereaf ter, vaste 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 formula for each batch 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 drum will be opened and visually inspected to verify solidification with no free-standing water.
E.
New LSCS solidification formulas may be developad and rided to the operating procedures to optimize drum radint f on Ir T-cr waste processing or to accomodate changes in eb,
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characteristics. For new fortulas, ini t f ril vis ta u-i be opened and inspect"d verify solidific.
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ite.
F.
The current LSCS solidification formulas are provided in Appendix A.
The fonnulas in Appendix A have been determined by Stock Equipnent Company to provide soldificiation within the following tolerances for waste and cement quantities; Cement
+ 5:
Sludges
+ 10%
Evap. Wastes
+ 5%
Should variations in waste and cement occur for the same drum, the tolerances listed above are half of that specified.
V.
Administrative Controis On LSCS Eolidification.
A.
Use of Procedures. Written stacion 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 solidification system.
2.
Solidification Formulas are provided for each LSCS Waste Stream.
3.
Each waste container is assigned a unique identification number. Operational parameters are recorded for each container.
4.
The container operational parameters are reviewed to verifiy that the drumming formula was followed.
5.
Waste containers are periodically inspected to verify solidification with no free-standing water.
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 vaste type will be tested to verify solidification. The test will consist of opening a container and inspecting for the presence of free-standing water.
If free-standing water is detected that cannot be attributed to operator error or systera malfunction, further solidification of that type of waste will be suspended until the Process Control Program is modified and proper waste solidification is verified.
D.
If the initial test of a batch fails 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 "ater.
E.
For the Spent Resin, URC Sludge, and Waste Sludge waste streams 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 vastes 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 Paraneters Which Could Affect LSCS Solidification.
A.
Cement Type. Type 3 Portland Cement is used as the solidification agent at LSCS. The cement is certified by the suppliers to meet the specifications of ASTM C150-1980.
B.
pH of Waste Stream. Stock Equipment Company has determined that extreme (greater than 10) pH values of vaste can adversely affect solidification.
1.
The Concentrator Waste Tanks receive wastes from the evaporat tis 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 1.'itial container of solidified waste is inspected to verify solidification without freestanding water.
3.
The other LSCS waste streams are slurries. The decanting tanks are utilized to control solids concentration.
D.
Slurry Settling times.
In order to obtain a uniform bed-ef-solids in the decanting tanks and consistent slurry concent ca t t the LSCS operating procedures provid i specific sett iin fer ca-:b t.
- V - ate.
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 Stock Equipment Company for the pretested fonnulas.
F.
Solidification (Set) Time. Steck 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 ta 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 reconmended a maximum concentrator wastes temperature of 160 F to preclude possible overpressurization of the solidified containers. At LSCS Concentrator Wastes temperature is monitored with a thermocouple.
In the event of waste temperatures exceeding 160 F the waste metering pump is tripped.
H.
Presence of Oil In Waste Streams.
Solidification tests performed by Stock Equipment Company involving typcially encountered oil types indicated that up to 2% 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.
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l LSCS PCP Revision 0 7/29/81 7
Appendix A LSCS Soldification Formulas I.
Spent Resin Tank 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.
Final Drun weight 607 lb.
II.
Waste Sludge Tank 10% free-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 minutee second time.
36.5 gallons of waste.
296 lb. Type 3 Cement.
Final Drum Weight 608 lb.
III. URC Sludge Tank 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.
RUCU Phase Separator Tanks 10% free-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 minates first time and 5 minutes second time.
296 lb. Type 3 Cement.
36.5 gallons waste.
Final Drum Weight 608 lb.
V.
Concentrator Waste Tanks Dru:2 Mixing Times 10 minutes first time and 5 minutes second time.
Quo '. ity of Type 3 Cement per attached graph.
Qu
-ity of Waste per attached graph.
ri, Dru, '. eight Variable
Revision 0 CONCENTRATED 11ASTE DRututitlG 7/29/81 FORMULA GRAPli 8
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LSCS PCP Revision 0 7/29/81 10 APPEh' DIX B LSCS Procedures Which Implement the LSCS PCP 1.
LOP-WX-01, Drum 11andling Bridge Crane Operation 2.
LOP-t!X-02, Decanting Station Operation 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.
6.
LOP-WX-14, Cement Day Tank Filling and Dnna Cement Loading.
7.
LOS-WX-SRI, Verification of Radwaste Solidification.
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