ML20214R181
| ML20214R181 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/19/1986 |
| From: | Silberg J SHAW, PITTMAN, POTTS & TROWBRIDGE, TOLEDO EDISON CO. |
| To: | Hoyt H Atomic Safety and Licensing Board Panel |
| References | |
| CON-#386-827 ML, TAC-60875, NUDOCS 8609290101 | |
| Download: ML20214R181 (21) | |
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- esoT acusnao e o c COUNSEL
- aourneo e v.Resea WRITE R S caRECT DIAL NUMBE R 822-1063 September 19, 1986 Helen F.
Hoyt, Esquire Administrative Judge Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Washington, D.C.
20555 In the Matter of The Toledo Edison Company et al.
(Davis-Besse Nuclear Power Station, Unit No. 1)
Docket No. 50-346 ML
Dear Judge Hoyt:
Per your request during the hearings (Tr. 965-66), enclosed is a copy of the preliminary plan for the disposal of waste at Davis-Besse.
This plan cannot be finalized until the Ohio Envi-ronmental Protection Agency issues to Toledo Edison a Permit to Install (PTI), since many of the particulars of the plan will depend on the requirements and conditions imposed by the PTI.
Nevertheless, Toledo Edison believes the preliminary plan, and the information presented during the hearing, are sufficiently develooed for the NRC to determine that the project will not be inimical to the health and safety of the public and will have no significant environmental impact.
8609290101 860919 PDR ADOCK 05000346 G
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SH Aw, PITTM AN, PoTTs & TROWB RIDGE A PAR?NER5H'P INCLUOtNG PROFE SSiONAL CORPORAfrQNg Helen F.
Hoyt, Esquire September 19, 1986 Page 2 During the hearing, you mentioned several concerns which prompted your desire to receive the plan.
The plan addresses these concerns.
The material to be used to solidify the waste (see Tr. 961) is discussed at section 3.3(g).
The boundaries of the waste disposal cells (see Tr. 961-62) are shown in Figure 2-1, and as sections 2.3 and 2.9 indicate, the depicted bound-aries encompass the area occupied by uniform dikes around the cells.
As section 3.5 of the plan states, the locations of the cells will be surveyed and recorded on a plat, which will be filed with appropriate State agencies.
Waste burial cells will also be identified in the Davis-Besse Updated Safety Analysis Report as those cells are constructed.
Licensee's acknowledgment of requirements that may be imposed following decommissioning (see Tr. 963) is_ presented in section 4.10 of the plan.
Toledo Edison recognizes that your ultimate decision in this proceeding will be based on the information presented at the hearing and repeated in this preliminary plan -- for example, on the location of the burial site and the methods of disposal that Toledo Edison has chosen.
If as a result of requirements imposed in the PTI or for any other reason Toledo Edison finds it neces-sary to substantially alter the plan -- and in particular if as a result of State proceedings the burial site location is modified
-- Toledo Edison will submit that information to the NRC before implementing an altered plan.
- ncerely, bat.
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e Toledo EdisoF Company Enclosure cc w/ encl: Service List
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Before the Administrative Judge In the Matter of
)
)
Docket No. 50-346-ML TOLEDO EDISON COMPANY, ET AL.
)
)
(Davis-Besse Nuclear Power
)
Station, Unit No. 1)
)
SERVICE LIST Helen F.
Hoyt, Esquire Charles A. Barth, Esquire Administrative Judge Office of the Executive Legal Atomic Safety and Licensing Board Director U.
S. Nuclear Regulatory Commission U.
S.
Nuclear Regulatory Commission Washington, D. C.
20555 Washington, D. C.
20555 Docketing & Service Section Genevieve S. Cook Office of the Secretary 25296 Hall Drive U.
S.
Nuclear Regulatory Commission Cleveland, Ohio 44145 Washington, D. C.
20555 Jack A. Van Kley Toledo Coalition for Edward Lynch Safe Energy and Susan A.
Sharon Sigler Carter Assistant Attorneys General c/o Terry Jonathan Lodge, Esq.
State of Ohio 618 North Michigan Street 30 East Broad Street Toledo, Ohio 43624 i
Columbus, Ohio 43215 l
Dr. Jerry Kline Donald L.
Schlemmer i
Administrative Judge Western Reserve Alliance l
Atomic Safety & Licensing Board 1616 P Street, N. W.
U.
S.
Nuclear Regulatory Commission Suite 160 Washington, D. C.
20555 Washington, D.
C.
20036 l
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pier #dM 000 METED USNRC 16 SEP 23 P2:47 0FFICE OF 5 hat iAP v 00CKETING A SEPvici BRANCH Toledo Edison Company Davis-Besse Nuclear Station i
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Project Plan / Conceptual Design Disposal of Very Low Level Radioactive Waste at Davis-Besse Site September, 1986
- o Table of Contents 1.0 Introduction 2.
Design of the Burial Site / Cells 3.0 Construction of Burial Cell 4.0 Burial Site Management and Operation ni i,ii,i,is-
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1.0 Introduct' ion
'The Toledo Edison Company (TED) intends to dispose of very low level radioactive waste at the Davis-Besse Nuclear Power Station.
The waste consists of water treatment system sludge and very low level radioactively contaminated secondary-side demineralizer resins.
The waste is currently retained in the Davis-Besse water treatment facility set-tling basin (south settling pond).
Information relating to the proposed waste burial disposal plans has been contained in the various correspondence be-tween the TED and NRC and the hearing record.
This document compiles that information (design, methods, materials, oper-ation, construction, location, etc.) into a single prelimi-nary plan.
This plan is preliminary in nature and is subject to change to satisfy conditions and requirements im-posed by the NRC, imposed by the State of Ohio in a Permit to Install, or otherwise found to be necessary.
2.0 Design of the Burial Site 2.1 The waste material to be buried is the water treatment system sludge and the secondary-side demineralizer res-ins.
The material is deposited in settling basin No. 2 (south settling pond).
It is anticipated that the ma-terial will be removed from the basin and buried ap-proximately every five (5) years of operation or six (6) times over the life of the Davis-Besse plant, until 2011 (expiration of Operating License NPF-3).
2.2 The largest estimate of the volume of~ material to be removed from the basin at each burial operation is 3
34,000 ft (for five years of accumulation).
2.3 The waste burial site will consist of individual cells constructed to contain a single cleanout of the set-tling basin.
Cells will be partially elevated earthen containers constructed in units of 3 cells, 2 cells and 1 cell as shown in Figure 2-1.
The cell boundaries marked on Figure 2-1 encompass cell walls ccnstructed as protective dikes (i.e. the boundaries are from toe of dike to toe of dike).
The cells are not contiguous due to location limitations.
2.4 The typical cell physical features include:
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a) conservative cell volume of 41,000 ft (larger than needed for the maxi.aum estimated waste vol-ume);
b) minimum freeboard of 1 foot between top of waste and top of cell walls / dikes; c) a liner at least 4 foot thick (see 2.6 for liner description);
'd) excavation for the cell not below an elevation of 567 IGLD; e) 3:1 slopes or less to prevent erosion; f) top of cell wall / dikes to 579.75 IGLD; g) square cells to minimize area and volume of earth work necessary; h) a cap of at least 2 feet of compacted clay (see 2.7 for cap description);
i) a leachate collection system (see 2.8 for leachate collection system description);
j) exterior flood protection (see 2.9 for flood pro-tection description); and n-t j
k) features to protect against erosion (see 2.10).
2.5 Typical cell dimensions are shown in a cross sectional dia-gram in Figure 2-2.
2.6 The cell liner will consist of (see figure 2-2):
a) a total four foot thickness (described in b through e below);
b) a bottom 2-1/2 foot thick layer of compacted clay comprising 6
i) native clay with nominal permeability of 1x10 cm/sec, 11) nonclay content not to exceed 15%,
.iii) placed in maximum of 12 inch lifts, and iv) compacted with sheepsfoot roller to 100% Ohio D.O.T. proctor test; c) next, a synthetic impervious membrane:
i) low density polyethylene liner (nonbiodegradable),
11) nominal specification permeability less than 10 1x10 cm/sec, 4-
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iii) nominal-thickness of 40 mils or greater, iv) welded or stapled seams to nominal permeability of
-8 lx10 cm/sec, v) pH 4-10 chemical compatability, vi) geotextile underliner for puncture resistance; d) next, a one foot drainage layer for leachate collec-tion, comprising i) crushed stone or ambient gravel graded from 3/8"
- 2" to prevent puncture of liner membrane, or 11) synthetic polyethylene drainage net with transmissivity equivalent to 12" of gravel or greater, and 111) filter fabric on top to prevent blockage by clay cover; e) finally, a six inch top layer of compacted clay, comprising
-6 i) native clay with nominal permeability of 1x10 cm/sec, 11) nonclay content not to exceed 15%,
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iii) compacted by vibrator to 100% Ohio D.O.T. proctor test.
2.7 The cell cap will consist of:
a) a bottom layer of at least 2 feet compacted clay (the clay layer will be graded and will increase to approxi-mately 4 feet in center of cell to prevent standing water), comprising
-6 i) native clay with nominal permeability of 1x10 cm/sec, ii) nonclay content not to exceed 15%,
iii) placed in lifts of no more than 12 inches, and iv) compacted with sheepsfoot roller to 100% Ohio D.O.T. proctor test; b) a filter layer above the clay for water drainage, comprising i) sand or 1-2" crushed stone or ambient gravel with nominal depth of 4-6" (based on the physical limi-tations of spreading material), or 11) synthetic polyethylene drainage net with transmissivity equivalent to 6" of gravel or greater; C
c) a top layer of top soil for vegetation, consisting of a minimum of 5" ambient top soil; d) a vegetative cover of shallow rooted grasses utilizing the U.S.
Soil Conservation Office's recommendation, comprising i) a mixture of Kentucky blue grass and Lidino white
- clover, 11) a seeding rate 416 blue grass and 616 lidino per acre.
2.8 The cell leachate collection system will consist of:
a) the synthetic impervious membrane and graded gravel layer of the liner (as described above);
b) a collection well.
2.9 The following features will protect the cells against floods:
a) the sides of all cells will be uniformly constructed as dikes; b) the dikes will be constructed to elevation 579.75 IGLD; c) the slope of the dike will be armored with stacked rip-rap, and the rip-rap rock will be no smaller than three (3) feet.
F' 2.10 The cell protection against erosion will consist of:
a) 3:1 slopes for exterior sides to minimize erosion; b) sloped and vegetated cap to minimize erosion; and, c ).
the use of either i) geotextile filter cloth on top of dike soil stra-tum, or 11) bedding stone layer of 3/8" to 1" crushed stone, pea gravel or ambient gravel (the layer to be ap-proximately one fourth the thickness of the rip-rap rock size), placed under the rip-rap.
3.0 Construction of Burial Cell 3.1 Each removal and burial of settling basin bottoms will be conducted as a project, in accordance with appro-priate procedures (NMP-NP-401 " Project Management", or equivalent).
3.2 The construction project management will include a project manager and team members from various responsi-ble divisions, as necessary, to ensure a project plan consisting of proper design, method of implementation, schedule, and functional assignments is prepared and executed. _-
r 3.3 Detailed specifications will be prepared to include:
a) the cell design; b) cell construction requirements, techniques, and acceptance criteria (including measures to ensure previous cells are not traversed or damaged, and that rip-rap on adjoining cells is not removed until new dikes are constructed);
c) synthetic liner procurement specifications (including material, thickness, puncture resis-tance, and tested compatibility with waste);
d) basin dewatering (sludge will not be allowed to dry out);
e) waste sampling; f) waste removal method and techniques:
i) use of vacuum trucks, and 11) operation will be performed by waste trans-porters licensed by Ohio; g) material used to solidify waste:
1) use of cement kiln dust (which is a compound that is predominantly calcium carbonate with
.g.
r minor amounts of calcium silicate, calcium aluminate, calcium sulfate, and lime and which has been determined by the U.S. EPA to be non-hazardous (40 C.F.R.
5 261.4(b)(8)),
ii) solidified waste will have the consistency of a very stiff to hard clay, and iii) solidified waste will have a very low permea-bility; h) method of mixing, including measures to protect liner (e.g. use of wide-tired equipment or place-ment of protective mat).
1) method of sealing the cells; and j) method of establishing vegetative cover, to in-clude 1) separate seeding with cyclone broadcast
- spreader, 11) use of straw mulch without fertilizer.
3.4 The order of cell construction will be (1) the western cell in the 3-cell unit; (2) the middle cell in the 3-cell unit; (3) the eastern cell in the 3-cell unit; (4) the eastern cell in the 2-cell unit; (5) the e
e western cell in the 2-cell unit; (6) the single cell unit.
3.5-After closure of each cell, a survey will be performed l
and the information recorded on a plat.
Pursuant to Section 3745-27-10(c)(8) of the Ohio Administrative Code, the plat will be filed with the Board of Health, County Recorder, and the Director of the Ohio EPA.
Constructed burial cells will also be identified in the Davis-Besse Updated Safety Analysis Report.
4.0 Burial Site Management and Operation 4.1 The TED Environmental Monitoring Section will be re-sponsible for the management of the completed waste burial site subsequent to the closure of each cell.
4.2 A description of the waste in each. cell, identified by type, volume, content, and date of burial will be main-tained.
4.3 Formal inspections will be conducted and documented on a semi-annual basis and subsequent to any significant flooding event.
A written inspection procedure will be developed prior to the completion of the first waste burial cell.
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4.4 Routine station surveys conducted by the Environmental Monitoring Section will include the waste burial site.
4.5 The waste burial cell cap (cover) integrity will be maintained and will consider the following:
a) maintenance of the vegetative cover; b) removal of spurious vegetation that compromises cover; c) reparation of erosion or cracking, if it occurs; d) reparation of all degradation caused by insect in-festation or burrowing animals.
e) eradication of pests.
4.6 Groundwater monitoring will be conducted in four wells.
One well will provide background data and the other three will be located in directions of possible ground-water flow.
Water in these wells will be sampled semi-annually for a) priority pollutants; b) pH; and c) radioactivity.
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4.7 The leachate collection system will allow for collec-tion of any leachate from the waste material.
Any leachate that develops will be tested and removed when necessary.
The disposition of the leachate will be de-termined based on the results of the tests.
4.8 Signs will be posted to alert any person in the area and to prohibit unauthorized access.
4.9 Records for the waste burial site will be retained as permanent NRC records under the Davis-Besse Nuclear Records Program and will be kept available for inspec-tion.
The records and documents to be retained in-clude:
l a) all records identified in 4.2 above; b) project records pertaining to the design and con-struction of the cells; c) survey and plat; d) settling basin sampling data; e) ground water monitoring data and reports; f) burial site inspection reports; and g) all maintenance reports.
4.10 Waste management activities after decommissioning will depend on the requirements determined by the NRC in the Davis-Besse decommissioning proceeding, on pertinent NRC regulations, and on the terms and conditions of the Ohio Permit to Install.
e-o Davis-Besse Nuclear Power Station Oak Harbor, Ohio July,1986 State I
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