ML20082K043
| ML20082K043 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 01/23/1991 |
| From: | Henderson L IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| To: | |
| Shared Package | |
| ML20082K031 | List: |
| References | |
| PRCP-A, NUDOCS 9108290150 | |
| Download: ML20082K043 (9) | |
Text
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PROCESS CONTROL PROGRAM FOR DEWATERING WEl RADI0 ACTIVE SOLID WASTE PRCP-A A
Revision 9 January 21, 1991 Duane Arnold Energy Center Iowa Electric Light and Power Company Approved by:
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9 PRCP-A Introduction This Process Control Program describes the dewatering of wet radioactive waste 1
solids from liquid systems and miscella eous radioactive material at the Duane l
Arnold Energy Center and packaging the vaste in high integrity containers (HIC) or steel containers (also referred to as liners).
Wet wastes are those wastes produced from the liquid radwaste treatment system or temporary local installations used for system decontamination and/or desludging operations. These wastes may typically be described as resins (bead and powdered), filter material, waste sludges, and filter precoat media.
Miscellaneous radioactive material mcy include metal and cartridge filters, metal piping, metal scrap, or any other material approved for disposal within a HIC or steel liner by the Prccessing vendor.
The dewatering process removes liquid from the waste in a HIC or steel liner to meet the criterion in 10 CFR Sections 61.56 (a)(3) and 61.56 (b)(2) and burial site requirements for free-standing liquid.
Stability for Class A waste is provided by the high integrity container as authorized by Section 61.56 (b)(1), where required.
l Vendor Scientific Ecology Group Inc., Formerly Westinghouse RF Inc., is the vendor of l
the dewatering and packaging services as well as the RACLGK"1 high integrity containers and steal liners used at the DAEC.
Scientific Ecology Group (SEG) l personnel perform the dewatering and packaging operations described herein.
Qgwaterinn System Description The SEC dewatering system employs dewatering equipment to dewater the wet radioactive waste solids in a HIC cr steel liner.
The SEG system consists of an overflow drum, container level irdicators, and interconnectin.],niping &nd valves. Attachment 1 is a diagram of the dewatering system as it is typically configured.
A waste-filled HIC or steel liner is dewatered in the radwaste processing area using dewatering equipment which is located in the radwaste 2 of 9 01/21/91 13 Rev. 9
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PRCP-A building.
The dewatering system usos service air supplied by the DAEC and axhausts air into the DAEC Radwaste Ventilation System. Water removed from the HIC or steel liner, during dewatering, is returned to the DAEC radwaste system and is treated as liquid radwaste.
The SE6 dewatering system is equipped with instruments to provide information I
about the devatering process.
These include mechanical ad electrical liquid level indicators with sensors in the HIC or steel liner, vacuum receiver tank, and dewatering manifold assembly.
Drainable liquid tests are perfermed using a vacuum pump and vacuum bottle to verify liquid content of the HIC or steel liner prior to shipment.
Coeratiqn The radioactive u stes that are dewatered and packaged in a HIC or steel liner for disposal are normally, but not limited to, wastes from the condensate phase separators, reactor water cleanup phase separators, waste sludge tanks, or the spent resin tank.
Wastes m% eccasionally be received from temp m ry local installations used ror syma, decontamination and/or desludging operations.
Nastes from any of the above mentioned systems a e piped to a waste holding tank which is piped directly to the vendor's equipment.
The wastes are transferred to the HIC or steel liner using the vendor's equipment as shown in Attachment 1.
A conductivity probe near the top of the HIC or steel liner interior that actuates an audible alarm and light provides an indication of the waste level during the HIC or steel liner filling and after dewatering.
Miscellaneous radioactive material may be placed within a HIC or steel liner.
The radioactive material shall be packaged in such a manner that ensures 3
protection of the HIC or steel liner, according to Processing Vendor recommendations.
This typically involves placement of material on to a resin btse within the HIC or steel liner.
Any remaining void space within the coltainer is filled with resin and then dewatered, c
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l PRCP-A After a HIC or steel liner is filled with waste, dewatering is performed by pulling a suction on the filter assemblies in the HIC or steel liner until lo,s of suction occurs, Loss of suction for the rapid dewatering underdrain is cefined as, (1) a vacuum drop of several inches of Hg from one steady vacuum to another; (2) a loss of continuous water flow in the dewatering hose.
Pump down by suction on the bottom ianderdrain manifold is continued for a specified time with the dewatering pump and the vacuum pump.
A drainable liquid test is performed by allowing the HIC or steel liner to rest for a stated time, then siphoning from the bottom underdrain manifold for a specified time to remove any liquid that has drained into it.
If needed, the liquid may be checked for pH to verify it is non-corrosive.
The drainable liquid test is passed if the volume of water removed is less than a volume demonstrateo by the vendor to indicate less than 1% free-standing liquid in the waste for the HIC being tested, or less than 0.5 percent drainable liquid for any container being sent to the Nevada burial site.
In the event the waste in the HIC or steel liner does not pass the drainable liquid test, a cycle of waiting a specified time, operating the dewatering and vacuum pumps, waiting a specified time, and then performing a drainable liquid test is repeated until the free-standing liquid criterion is met.
Specific times appropriate for the HIC or steel liner and waste being dewatered have been determined by the vendor and are stated in the dewatering precedure.
Essential Waste Characteristics and Verification The requisite characteristics of the radioactive waste addres ad by this Process Control Program are stated in 10 CFR Section 61.56, State of Nevada, State of Washington, and State of South Carolina License conditicas, as appropriate.
The wastes subject to the process control plan are from sources within the DAEC that are well characterized and generally recognized as meeting the essential qualities of Section 61.56 (a), and burial site requirements.
By knowing the source and kind of each of the subject wastes, IELP is able to ensure that the i of 9 15 01/21/91 Rn. 9
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e PRCp-A qualities of the wastes continue to meet tha requirements of Section 61.56 (a),
and are compatible with the HIC or steel liner itself.
In addition, the DAEC's i
chemical control program helps prevent listed substances from being admitted into the waste streams that ate deposited into the HIC or steel liner.
If the waste stream or dewatering effluent is potentially corrosive (i.e., chemical j
decon wastes), pH is to be verified prior to packaging and after processing.
10 CFR Section 61.56 (b) includes provisions for stability of radioactive wasi.e 4
j after its disposal.
For the wastes covered by this PRCP, Iowa Electric intends j
to provide stability when required by burial site licensing condition and part j
61 by placing the waste 'in a high integrity cont'ainer that will be stable after l
disposal as authorized in Section 61.56 (t-)(1).
Both 10 CFR Sections 61.56 (a)(3) and 61.56 (b)(2) require as little free-standing and noncorrosive liq':id (Verify non-corrosiveness by performing a pH test of initial and final effluent from dewatering.)
as is reasonably achievable-and no more than 1% of the volume-of the waste when the waste is in l
a disposal container designed to ensure stability except for-the Nevada-site j
which stipulatas less than 0.5-percent in any container.
Iowa Electric intends i
to accomplish this by dewatering as described herein and to perform surveillance j
to assure that it has been done.
For a given type of waste, the operating
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procedure requires the vacuum pump and dewatering pump be operated for stated a
time interval (s).
Dewatering is considered comolete when the volume of liquid that can be suctioned from the HIC or steel liner during a defined time _is no greater than an amount stated in the operating procedure pertaining to-that kind j
of waste.
The conditions stated in the procedure will have.been demonstrated j
by the vendor of the dewatering service to achieve less than 1% or 0.5 percent l
free-standing water in the waste, appropriate to the burial site being sent to.
l l-Hiah Intearity Container l
Wastes covered by this PRCP will be packaged in-RADLOK*~ high integrity i
containers or steel liners.
The RADLOK containers have been certified by the l
South Carolina Bureau of Radiological Healta for the intended use. Steel line s 5 of 9 16 01/21/91 j-hev. 9-L
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will qualify as strong, tight _ containers as per 49CFR. Use of Radiok containers-I j
at U.S. Ecology requires placement into an engineered barrier to provide 4
j stability.
Each container will be visually inspected before use for acceptable condition j
of:
1.
Sealing components,-
a j
2.
Exterior surface, 4
3.
Devatering filter elements, and 4.
Dewatering verification tube.
g After filling and dewatering has been completed, the fill port opening-in the i
container.is' closed in accordance with written procedures.
The-procedure
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requires verification that the closure gasket is in place and that the threaded
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fill port lid is tightened to a specified torque value when-required by procedure, i
I Quality Assurance i
j Control of the dewatering and packaging. processes is maintained by conducting i
_these operations according to written-procedures addressing container l
inspection before-filling, dewatering, container closure, and cask loading.
j, The vendor verifies and doce:aents that key steps have-been performed.
L Iowa Electric maintains assurance that acwaterins ;,-d ;;:k:ging is performed' l
as intended by separately verifyfcg and documenting-thatztheikey steps were l
performed.
All services and materials procured for processir.g greater than-I Type-A quantities of radioactive waste will;be procured as Qualityftevel II.
l Allfservices and material must be procured in compliance with 10CFR71 and 49CFR-for Packaging and. Transporting Radioactive' Materials; ll Iowa Electric's quality assurance program is subject to 10 CFR Part 50, Appendix
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B, as applied to dewatering and packaging of radioactive waste.
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PRCP-A Adminis(ralign The Radiation Protection Department maintains or requires the vendor to maintain procedures which will ensure that all applicable requirements are met prior to shipment of radioactive waste.
Iowa Electric Light and Power will review applicable vendor's operating procedures before authorizing the vendor to dewater radioactive waste.
Site specific procedures developed by the vendor for the DAEC will be reviewed by the Radiation Protection Supervision.
Most recent revisions will be stamped as approved on both working and controlled vendor procedure copies.
Processing procedures internal to the vendor will be reviewed and approved by the vendor.
The Radwaste Gro;p of the Radiation Protection Department is responsible for ensuring compliance with the PRCP, for vendor verifications, and for recordkeeping.
At least once every 24 months, IELP will audit the radwaste Process Control program and operating proceduret that implement it (10 accordance with Technical Specification 6.5.2.8.J.)
Any chanie to the Process Control Program will be made in accordance with Technical Specifica' ion 6.15, approved by the Plint Superintendent-Nuclear, reviewed by the Operations Committee, and submitted to the NRC in the next Semi-Annual Radioactive Material Release Report after the change is made.
Trainina Before a vendor employee performs a ::osatoring or packaging procedure that is subject to this PRCP. they must have received re'evant training, and Iowa
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Electric must have received documented confirmation of their training along with a statement of their qualefications.
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9 PRCP-A References 1.
DAEC Radwaste Handling Procedures 2.
Scientific Ecology Group Incorporated Procedure ST3-P-03-046, Tr ansfer and Dewatering lon Exchange Resin and/or Activated C'eccoal Filter Media using the Hittman Rapid Dewatering System.
3.
Scientific Ecology Group Incorporated Procedure F430-P-009, Transfer and Dewatering Ion Exchange Resin and/or Activated Charcoal Filter Media using the SEG Rapid Devatering System.
4.
Scientific Ecology Group Incorporated Procedure STD-D-03-009, A User's Manual For The Westinghouse Radlok-200, Radiok-500, Radlok-100, Radlok-179, and Radiok-195.
5.
Westinghouse Hittman Nuclear Inc. Topical Report STD-R-05-Oll, Mobile Incontainer Dewatering and Solidification System (MDSS).
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