ML20129C044

Requests Approval of Proposed Procedures to Dispose of Licensed Matl Contained in Low Level Radioactivity Contaminated Sewage Treatment Plant Sludge.Land Application of Matl within Plant Restricted Area Proposed

ML20129C044
Person / Time
Site:	LaSalle
Issue date:	05/23/1985
From:	John Marshall COMMONWEALTH EDISON CO.
To:	Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
References
0159F, 159F, NUDOCS 8506050393
Download: ML20129C044 (20)

Text

{{#Wiki_filter:y.. Commonwealth Edison One First National PtarA Chicago, Ilhnois Address Reply to: Post Othee Box 767 Chicago. Illinois 60690 May 23, 1985 Mr. William J. Dircks Executive Director for Operations U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

LaSalle County Station Units 1 and 2 Petition for Disposal of Low Level Radioactiviely Contaminated Sludge by Land Application Under 10 CFR 20.302(a) Facility Operating Licenses NPF-ll and WF-18 NRC Docket Nos. 50-373 and 50-374

Dear Mr. Dircks:

Pursuant to 10 CFR 20.302, Conmonwealth Edison is submitting this application for approval of proposed procedures to dispose of licensed material contained in low level radioactivity contaminated sewage treatment plant sludge. We propose to dispose of this material by land application within the restricted area at LaSalle County Station. Justification for approval of this request is provided in attachments to this letter. Enclosed are the following Attachments as listed: Attachments (1): Disposal of Low Level Radioactively Contaminated Sewage Treatment Plant (STP) Sludge (2): System Materials Analysis Department Report on Soil Samples from Proposed Sewage / Sludge Application Site at LaSalle County Station (SS 84-17) (3): Letter dated December 20, 1984 concerning Proposed Sewage Sludge Land Application Site at LaSalle County Station (4): Isotopic Summary of Sewage Treatment Plant Sludge at LaSalle County Station (5): Site Plan Drawing Slowing Proposed Area for-Land 4 Application g a a.sf 0gdIe 8506050393 850523 DR ADOCK 050 33 s, 4p

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'n i.. ~~ i; WI'J. Dirck May 23, 1985

~ .Please' direct any questions you may have concerning this matter to. - this office.' A fee remittance of'$150.00 is enclosed' pursuant to 10 CFR 170.. One signed original and forty (40) copies of this letter are provided for your use. Very truly yours, % M'W1 N J. G. Marshall Nuclear Licensing Administrator -1m .-Attachments ~ -cc: J. G. Keppler, Region III Resident _ Inspector - LSCS G. Wright ~- State of Ill. u-A.'Bournia - tRR G. J. Diederich - LSCS 0159K u

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ATPACHMENP 1 DISPOSAL OF LOW LEVEL RADIOACTIVELY CONTAMINTED SEWAGE TREATMENT PLANT (STP) SLUDGE LIntroduction The purpose.of this document is to provide the necessary information 'to obtain:NRC approval for the disposal'of contaminted STP sludge by -land application at LaSalle County. Station (LSCS). The LaSalle STP. . produces approximately 200,000 gallons of sludge at a concentration of about 8000 ppm total suspended solids per year. This corresponds to approximately 500 cubic feet of dried sludge. This~ document-describes.the background of the problem, and evaluation of disposal-methods,. justification for land application of STP sludge as the preferred method for disposal and a description of the proposed method of disposal.

===. Background=== -The -disposal of. contaminated STP sludge has been a problem since the 'beginning of the plant's operation. The only isotopes found in the sludge thus-far are Co-60, Co-58, and Mn-54. Evaluation of Disposal Methods -The following alternatives have been considered to deal with the disposal of the contaminated STP sludge: 1. shipment to commercial waste disposal sites as dry active waste (DAW) for disposal 2. on-site land application .The first alternative is costly. Disposal costs-are ~ $35/ cubic ft of sludge' including DAW box, burial, and transportation. The second alternative considered was land application. _Since the nuclearEindustry is concerned with saving space at low level disposal sites the most' prudent method of disposal is by on-site land application. This method of disp,osal is the most cost ef-fective and has less environmental impact than disposal in a -commercially operated disposal site.

h A'ITAODENT 1 PAGE 2 1 Justification for Land Application m LThe' advantages of' land application ~over disposal as DAW are: .e la. - Land application reduces the amount of DAW

produced and'therefore. saves'the limited

.. disposal site spaceLavailable to the industry. lb. ' Commonwealth Edison (Ceco). may not be able:to use the-present disposal sites after=31DEC85. 2. The radiological-impact of plant application. of STP sludge, is insignificant because the total radioactivity content is low. . Environmental Impact. Soil' samples were> collected to characterize the soils for the pro-posed site'in accordance with Illinois Environmental Protection ~ Agency (IEPA) regulations (Title 35; Subtitle C:. Chapter II;.Part 391, Design Criteria for Sludge Application on Land). The samples were.then.sent to Commonwealth Edison-Company's (CECO) System - Materials and Analysis Department for chemical and physical analyses -(See attachment one).- The-results lof these analyses were_ reviewed lyr CECO's Environmental - Af fairs. Department andi found to be well suited for land application lof _ sewage sludge. -(For a more detailed evaluation see attachment two) 1 . Radiological-Impact

To determine the radiological impact due to land application of low

-level radioactively' contaminated sewage ciudge at LaSalle Station, , CECO hired Sargent and Lundy tx) perform the necessary calculations. Their calculations indicate that a person continuously occupying 'the' central portion of'the land' application site would receive approximately 3 mrem /yr which is 0.6% of the.10CFR Part 20' dose limit of 500 mrem /yr for unrestricted areas. For a worker spending ~ 2000 hours /yr~1n this area, the total whole body dose is reduced to 0.69 mrem /yr. For these calculations a source region of 3 inches to.3 feet thick and a 100 meter radius, no earth shielding was assumed 2 (See : attachment three). ~ i. m -.. m 1. 1

ATTAWMENT 1 PAGE 3 Method of Disposal. -The STP sludge will be applied to a three acre area near.the STP in the restricted area (see the topical Sargent and Lundy drawing attachment four).. 1The-following. steps-will be taken to dis' pose of the sludge: 1. Environmental Affairs will obtain a land application permit for sewage sludge from the IEPA. 2. The STP sludge will be concentrated in the digester. 3. An isotopic analysis will be performed on a sample of sludge in the digester. This sample will be checked against an administrative limit of less than or equal to 1E-06 uCi/cc for each of the following isotopes: Co-60, Co-58, and Mn-54 and less than or equal to 3E-06 uCi/cc total gammma activity which is less than 10% of the limits.-in Table II. Column 2 of 10CFR20 Appendix B. and less-than-6% of the limit of 1 for-the total MPC. 4; Sludge which meets these limits will pumped to the drying beds for further volume reduct-lon. j5..-Sludge exceeding these limits will be pumped to a roped of f drying bed and the dried sludge will be shipped as DAW. 6. Once the. sludge has' dried to a cake, the sludge will then be broken-up and distributed over a given area of the land application site which will be roped off. 7. The site will be plowed once in the spring and once.in the fall. Alfafa will be planted on the site to stabilize the soil and prevent - runoff, 8. Records as to how many gallons of sludge sent to the drying beds, a radionuclide analysis of the sludge and the amount of dried sludge prod-uced in cubic feet will be kept for documentation. l I l

11..

.. n- /,, A'ITACfD970 2 M-3 m -H 9-27-84 SYSTEM MATERIALS ANALYSIS DEPARTMENT REPORT ON SOIL SAMPLES FROM THE PROPOSED SEWAGE / SLUDGE APPLICATION SITE LASALLE COUNTY STATION (SS84-17) At the request of Mr. M. Knight, Environmental Affairs, four (4) soil samples from the proposed sewage / sludge application site at LaSalle County Station were submitted on June 12, 1984, for various physical and chemical analyses. The first sample was a composite of core samples from sites 1 through 10. Sample 10a was a core from site 10, 0-12 inches below the surface of the soil. Sample 10b was a core from site 10, 12-24 inches below the surface of the soil. Sample 10c was a core from site 10, 24-36 inches below the surface of the soil. All samples were air dried to constant weight and ground to 60 mesh. The analyses were performed using the procedures listed in Methods of Soil Analysis. Part 2. Chemical and Microbiolooical Properties, Second Edition, (edited by A. L. Page, R. H. Miller, and D. R. Keeney, American Society of Agronomy, Inc., Soil Science Society'of America, Inc., Madison, WI, 1982) and in Field and Laborataory Methods Applicable to overburdens and Minesoils (U.S.E.P.A., EPA-600/2-78-054, March, 1978). The results of the analyses are listed on the following pages. \\ +/ Approved by/ /2 ' [ Reported by: h Copies to: T. E. Hemmingerv Station Chemist Station Superintendent Chem. Eng. Services - TSN' Tech Staff Supervisor 10.7 l 1326M - - -.~.-- -

fa r k. l f,[ 3 .l !~' ATTA0 DENT 2 .M-3995-84 i (SS84-17) TABLE 1 PARAMETERL SAMPLE SITE 1-10 Composite 10a 10b 10c PH (10% Slurry) 7.6 7.6 6.5 6.8 Cation Exchange Capacity 39.1 40.9 41.0 ~40.4 Sodium Extraction (meq/100 g)

Soluble Salts by Electrical 230 200 90 110 Conductivity (ug/g)

' Total Organic Carbon (ug/g) 21,500 21,800 22,100 7,200 Total Kjeldahl Nitrogen <~100 2,100 2,300 1,000 (ug/g as N) Ammonia. Nitrogen (ug/g) 16.6 18.5 28.7 10.4 Total Phosphorus (ug/g as P) 184 101 < 0.25 65 5 Plant Available Phosphorus < 0. 2 5~ < C.25 < 0. 25 < 0. 2 5. *--- (ug/g as P) r. 1 i ./ ,/

' _... 4,*f,. [f . ATTACHMENT 2 M-3995-84 Page 3 (SS84-17) TABLE 2 P TOTAL METALS' SAMPLE SITE 1-10 Composite 10a 10b loc (ug/g) (ug/g) (ug/g) (ug/g) Arsenic, As 17 1 8 14 Barium, Ba 220 150 220 100 Boron, B < 200 < 200 < 200 < 200 Cadmium, Cd 2 2 2 2 Calcium, Ca 3100 7100 5600 2900 Chromium, Cr 93 65 49 62 Copper, Cu 70 61 43 58 Lead, Pb 30 30 30 30 Mercury. Hg 0.03 0.06 0.03 0.04 Nickel, Ni 205 121 85 105 Potassium, K 9800 12,000 11,000 9800 Selenium Se < 2 <2 <2 %2 Zinc, Zn 93 92 76 84 i } h

\\ ':'.. ,., ' i- . ATTACHieff 2 M-3995-84 (SS84-17) TABLE 3 PARTICLE SIZE ANALYSIS SAMPLE SITE (Hydrometer Particle Sizing) 1-10 Composite 10a 10b loc % Sand 36.6 38.2 34.1 41.6, % Silt 45.2 44.8 50.7 42.2- .% Clay 18.2 17.0 15.2 16.2 i l l l I I i t y

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ATTACHMENT 3 December 20, 1984 To: D. F. Malauskas

Subject:

Proposed Sewage Sludge Land Application Site at LaSalle County Station The following summarizes the Environmental Affairs Department's activities to date regarding the development of the subject site. A site, approximately three acres in size, considered geograph-ically and topographically acceptable for sewage sludge application was identified in June, 1984. Soil samples were collected to characterize the soils of the proposed site in accordance with Illinois Environmental Protection Agency (IEPA) regulations (Title 35; Subtitle C; Chapter II; Part 391 Design Criteria for Sludge Application on Land).- These samples were submitted to S m for chemical and physical analysis. The results of these analyses are enclosed as Attachment 1. Data from the physical soil analyses indicate that the surficial soils of the proposed site (i.e., 0-24 inches below the surface), as well as the shallow subsoll (24-36 inches below the surface), are all loam soils. The geology of the station area suggests that-these soils were probably derived from glacial till and, therefore, should be considered' loam tills. Through use of the LaSalle county soil Survey-(Soil Conservation Service, 1972), it has been determined that the soils of the proposed land application site are part of the Flanagan/ Drummer /Catlin soil association. These soils are considered very good agricultural soils; the Soil Conservation Service places no restrictions on their use. The soils of this association are also considered acceptable for use as a land application site by the IEPA (section 391.404j). Consideration of the chemical analyses performed on the soils of the proposed site also suggests that the site is acceptable for land application of sewage sludge. Soil pH levels of all samples are equal to or in excess of the IEPA limit of 6.5 (Section 391.404d). The cation exchange capacity of all soil samples is far in excess of the minimum required for sewage sludge application (5 meq/100 g). The soluble salt content of the soils is not considered excessive by agronomic standards. The concentrations of the principal plant nutrients (nitrogen, phosphorus, and potassium) measured in these soils are, for the most part, considered normal, of some concern, however, are those measurements of total Kjeldahl nitrogen, total phosphorus, and plant-available phosphorus determined to be below the detection limit of the analytical procedure employed..When compared to the ample amounts of Kjeldahl nitrogen and phosphorus detected in the other soil samples, such low levels are surprising. While the cause of these low levels is unclear, it may be prudent to collect additional soil samples for analysis of these parameters at some time in the future.

A'ITAQDENT 3 To summarize, it would appear that the proposed site is well suited as a location for the land application of sewage sludge. However, without a complete analysis of the sewage sludge itself, estimates of the capacity of the proposed site to accept / absorb sewage sludge cannot be made. Such estimates are required as part of a land application permit application._ Since the amounts of sludge that would be land applied annually are thought to be relatively small (approximately 45,000 g/yr), it is unlikely that the capacity of the proposed site would be exceeded. At this point in time, we do not feel we can pursue the permitting of this land application site further until the status of the sewage sludge is clarified by the Nuclear Regulatory Commission (NRC). If the material can be exempted from being considered as trace-contaminated by the NRC and land applied as sewage sludge without special precautions, we will then prepare the agronomic calculations and sludge management plan required as part of the IEPA application. 4 To complete the sludge management plan, the following analyses of sewage sludge from the LaSalle County Station will eventually have to be conducted: - % Total Solids - Total Phosphorus - Ni Content - % Volatile Solids - Total Potassium - Zn Content - pH - As Content - Radionuclide Content - Volatile Acids (if - Cd Content - PCB Content anaerobic digestion - Cr content is used) - Cu Content - Total Kjeldahl Nitrogen - Hg Content - Ammonia Nitrogen - Mn Content should you have any questions regarding this matter, please contact me. /24 O Mark J. Knight ) Approved: ) Il 6177E PUK:dd cc: S. K. Winship J. Arand P. Noska File: 12-PER-N4

l 'A'ITACEMNP 4 PAGE 1 Isotopic Summary of-Sewage Treatment Plant Sludge at LSCS TABLE 1 Isotope uCi/ml (AVG) uCi/ml (High) Co-60 7.3 x 10 -8 1.0 x 10 -7 Co-58 3.6.x 10 -8 4.0 x 10 -8 Mn-54 8.1 x 10 -8 2.0 x 10 -7 C'alculation'for dose to person occupying center of land application area. Refer to pages 3,4'and 5 of this attachment for dose due to individual isotope. Source radius R 100 m = Earth Shielding 0 inches = Source Thickness 3 feet (sludge applied > 3ft thick does not affect = dose rates because-of self shielding effects from the sludge) Dose rate for 10 -6 uCi/cc Normalized dose rate for-source - (Administrative limit) isotopic source (Table 1 column 3 above) Co-60 2.7 x 10 -3 mead /hr 2.7 x 10 -4 mrad /hr Co-58 2.0 x 10 -3 stad/hr 4.8 x 10.-5 mrad /hr. Mn-54 9.8 x 10 -3 mrad /hr 2.6 x 10 -5 mead /hr Total 13.5 x 10 -3' mrad /hr Total 3.4 x 10 -4 mead /hr I l L t I } t.

'.S ATTACE O Tf 4 .PAGE 1 Isotopic Summary of Sewage Treatment Plant Sludge at LSCS TABLE 1 Isotope uCi/ml. ( AVG) uCi/ml (Iligh) Co-60 7.3 x 10 -8 1.0 x 10 -7 Co-58 3.6 x 10 -8 4.0 x 10 -3 Mn-54 8.1 x 10 -8 2.0 x 10 -7 Calculation for dose to person occupying center of land application area. Refer to pages 3,4 and 5 of this attachment for dose due to individual isotope. Source radius R 100 m = Earth Shielding 0 inches = Source Thickness 3 feet (sludge applied > 3ft thick does not affect = donc rates because of self shielding effects from the sludge) Dose rate for 10 -6 uCi/cc Normalized dose rate for source isotopic source (Tabic 1 column 3 above) Co-60 2.7 x 10 -3 mrad /hr 2.7 x 10 -4 mrad /hr Co-58 2 x 10.-3 mrad /hr 4.8 x 10 -5 mrad /hr Mn-54 9.8 x 10 -3 mrad /hr 2.6 x 10 -5 mrad /hr Total ~ 3.4 x 10 -4 mrad /hr c

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