ML20236L075
| ML20236L075 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 06/30/1998 |
| From: | Hannon J NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20236L078 | List: |
| References | |
| NUDOCS 9807100208 | |
| Download: ML20236L075 (8) | |
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7590-01-P l
UNITED STATES NUCLEAR REGULATORY COMMISSION ENTERGY OPERATIONS. INC.
l DOCKET NO. 50-382 l
l WATERFORD STEAM ELECTRIC STATION. UNIT 3 l
ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT l
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i The U.S. Nuclear Regulatory Commission (the Commission) is considering issuance of l
an amendment to Facility Operating License No. NPF-38, issued to Entergy Operations, Inc., (the licensee), for operation of the Waterford Steam Electric Station, Unit 3 (Waterford 3), located in L
St. Charles Parish, Louisiana.
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ENVIRONMENTAL ASSESSMENT Identification of the Proposed Action:
The proposed action would change the Waterford 3 Technical Specifications to allow an i
increase in the Waterford 3 Spent Fuel Pool (SFP) storage capacity from 1C88 to 2398 fuel l
assemblies, and to allow an increase in the maximum fuel enrichment from 4.9 w/o (weight percent) to 5.0 w/o U-235. The increase in spent fuel storage capacity is achieved by replacing the existing spent fuel storage racks by the higher density racks, a process referred to herein as "reracking." The proposed action is in accordance with the licensee's application for license amendment dated March 27,1997, as supplemented by letters dated April 3, July 21, October 23, November 13, and December 12,1997, January 21, January 29, March 23, May 1, May 19, May 21, May 28, and June 12,1998.
The Need for the Proposed Action:
The Waterford 3 SFP currently contains 1088 storsge cells in 16 spent fuel racks and full
' oore off-load capability would be lost in the year 2000. Under the proposed reracking, the 16 L
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t 2-existing racks a hich contain Bornflex as the neutron absorber, would be removed and replaced by new high density modules. There are no commercial independent spent fuel storage facilities operating in the U.S., nor are there any domestic reprocessing facilities; therefore, the projected l
loss of storage capacity in the Waterford 3 SFP would affect the licensee's ability to operate Waterford 3. The proposed amendment will provide a full core off-load capability through the end of Cycle 19 (Year 2018).
Environmental!monets of the Proposed Action:
Radioloalcalimosc's The Waterford 3 uses waste treatment systems designed to collect and process gaseous, liquid, and solid waste that might contain radioactive material. These radioactive waste treatment systems are evaluated in the Final Environmental Statement (FEG) dated March 1973.
The proposed rerack will not involve any change in the waste treatment systems desciibed in the FES.
Radioactive Meterial Released to the Atmosohere During reactor operation, a small percentage of the fuel assemblies in the core ars cr.pected to develop leaks, resulting in a release of fission products to the reactor coolant. The storage of additional spent fuel assemblies in the SFP will not significantly affect the release of radioactive gases from the SFP since fission products generally do not escape from the SFP.
The higher fuel bumup used in the new rack analysis will result in a higher concentration of Krypton-85 (Kr-85) in the reactor coolant, some of which will be introduced into the SFP water during refuelings. Accounting for this increased Kr 85 concentration in the SFP water, the licensee calculated that the Kr-85 concentration in the air in the fuel handling building would be n
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. two orders of magnitude lower than the permissible effluent concentration for the general public (Appendix B of 10 CFR Part 20),
lodine-131 released from spent fuel assemblies to the SFP water will not be significantly increased due to the expansion of the fuel storage capacity since the lodine-131 inventory in the fuel will decay to negligible levels between refuelings.
Most of the tritium in the SFP water results fmm activation of boron and lithium in the primary coolant. A relatively small amount of tritium is produced during reactor operation by the fission process within the reactor fuel. The subsequent diffusion of the tritium through the fuel and cladding represents a small contribution to the total amount of tritium in the SFP water.
Tritium rolesses from the fuel assemblies to the reactor coolant occur mainly during reactor operation and, to a limited extent, shortly after shutdown. Since a small portion of the tritium is due to fission in the fuel, the increased fuel bumup will result in an increase in the amount of tritium in the reactor coolant.
Most airt>ome releases of tritium from nuclear power plants result during refuelings from evaporation of reactor coolant, which contains tritium in higher concenitations than in the SFP.
The storage of additional spent fuel assemblies in the SFP is not expected to increase the SFP bulk water temperature significantly above the 155' used in the design analysis and, therefore, evaporation rates from the SFP are not expected to increase. The higher tritium cor,centrations in the SFP water are expected to result in higher airbome tritium levels in the fuel handling building. However, the licensee has calculated these tritium levels to be lower than the permissible effluent concentrations for the general public contained in Appendix B of 10 CFR Part 20.
.. Egfid Radioactive Wastes Spent resins are generated by the processing of SFP water through the SFP purification system. These spent resins are replaced about two to four times a year and are disposed of as solid radioactive waste. The licensee will use a vacuum system with an underwater filtration unit to clean the floor of the Cask Storage Pit prior to raracking and the floor of the SFP following removal of the old SFP rack modules. Vacuuming of the SFP and Cask Storage Pit will remove any extraneous deDris, reduce general contamination levels pnor to diving operations, and ensure visual clarity in the SFP to facilitate diving operations and SFP rack changeout. Tne licensee also plans on hydrolazing the old fuel rack modules with demineralized water before removal from the SFP to remove any loose crud from the modules. If necessary, the licensee may also use a wire brush or equivalent abrasive tool to assist in the removal of hot particles.
The licensee does not expect that the additional fuel storage made possible by the increased storage capacity will result in a significant change in the generation of solid radweste (in the form of spent resins).
Once the old SFP rack modules hua bet.) hydrolazed, they will be placed into anti-contamination bags and loaded into shipping containers for shipment offsite for decontamination and disposal. The licensee has stated that the shipping containers and procedures will conform to all applicable U.S. Department of Transportation (DOT) and/or U.S. NRC regulations.
Liould Radioactive Wastes There should not be a significant increase in the liquid release of radionuclides from the plant as a result of the modifications. The SFP cooling and purification system operates as a closed system. The SFP lon exchanger resins remove soluble radioactive materials from the SFP water and the frequency of resin changeout may increase during the installation of the new racks due to the n. ore frequent fuel shuffling and underwater hydrolazing of the old racks during i
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. removal.' When the resins are changed out, a small amount of resin sluice water is released.
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However, the amount ofliquid radioactive released to the environment as a result of the proposed reracking is expected to be negligible.
l Occupational Doses Radiation Protection personnel will constantly monitor the doses to the workers during the reracking operation. Divers used to perform work in the SFP will be equipped with five remote readout radiation detectors, which will be continuously monitored by Radiation Protection personnel. The total occupational dose to plant workers as a result of the reracking operation is estimated to be between 6 and 12 person-rem. This dose estimate is comparable to doses for similar SFP modifications performed at other plants. The upcoming reracking operation will follow detailed procedures prepared with full consideration of ALARA principles. On the basis of our review of the Waterford 3 proposal, the staff concludes that the Waterford 3 SFP rack modification can be performed in a manner that will ensure that doses to workers will be maintained as loty as is reasonably achievable (ALARA). The estimated dose of 6 to 12 person-rom to perform the proposed SFP rerack is a smsli fraction of the annual collective dose ' accrued at Waterford 3.
Uranium Fuel Cvele and Transportation The environmentalimpacts of transportatbn resulting from the use of higher enrichment fuel are discussed in the staff assessment entitled "NRC Assessment of the Environmental Effects of Transportation Resulting from Extended Fuel Enrichment and Irradiation," dated July 7, 1988. This was published in the Federal Register on August 11,1988 (53 FR 30355), as corrected on August 24,1988 (53 FR 32322), in connection with an Environmental Assessment and Finding of No Significant impact related to the Sheron Harris Nuclear Power Plant, Unit 1.
As indicated therein, the environmental cost contribution of an increase in fuel enrichment of up
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to 5 weight percent U-235 and irradiation limits of up to 60 gigawatt days per metric ton (GWD/MT) are ehher unchanged, or may in fact be reduced from those summarized in Table S-4 asset fcrth in 10 CFR 51.52(c). These findings are applicable to the proposed amendment for Waterford 3. Accordingly, the Co,nmission concludes that this proposed action would result in no significant radiological environmental impact.
Accident Considerations in its application, the licer.see evaluated the possible consequences of a fuel handling I
accident to determine the thyroid and whole-body doses at the Exclusion Area Boundary (EAB),
Low Population Zone (LPZ), and Control Room. The proposed reracking of the Waterford 3 SFP will not affect any of the assumptions or inputs used in evr;iuating the dose consequences of a fuel handling accident and therefore will not result in an increase in the doses from a postulated fuel handling accident.
Nonradioloaical Impact The proposed amendment does not modify land use at the site; no new facilities or laydown areas are neede# to support the rerack or operation after rerack; therefore, the proposed amendment does not affect land use or land with historical or archeological sites. The proposed action does not result in any significant changes to the types and amounts of effluents that may be released offsite. Therefore, no changes or different types of nonrar.'JIogical environmentalimpacts are expected as a result of the amendment.
Summary The Commission has completed its evaluation of the proposed action. The change will not increase the probability or consequences of accidents, no changes are being made in the types of any effluents that may be released offsite, and there is no significant incesase in the allowable individual or cumulative occupational radiation exposure. Accordingly, the Commission l
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1 concludes that there are no significant radiological environmental impacts associated with the l
1 proposed action.
With regard to potential nonradiological impacts, the proposed action does not affect nonradiological plant effluents. Accordingly, the Commission concludes that there are no significant nonradiological environmental impacts associated witn the proposed action.
bj[g_rDatives to the Proposed Action:
Since the Commission he's concluded there is no measurable environmental impact associated with the proposed adion, any attematives with equal or greater environmental impact I
need not be evaluated. As an altamative to the proposed action, the staff considered denial of the proposed action. Denial of the application would not result in any significant change in current environmentalimpacts. Tiie environmentalimpacts of the proposed action and the altemative action are similar.
Altemative Use of Resources:
This action does not involve the use of any resources not previously censidered in the l
Final Environmental Statement for the Waterford 3.
Aaencies and Persons Consulted:
In accordance with its stated policy, on June 17,1998, the staff consulted with the Louisiana State official, Dr. Stan Shaw of the Louisiana Radiation Protection Division, regarding the environmentalimpact of the proposed action. The State official had no comments.
FINDING OF NO SIGNIFICANT IMPACT j
Based upon the environmental assessment, the Commission concludes that the proposed action will not have a significant effect on the quality of the human er:vironment.
Accordingly, the Commission has determined not to prepare an environmental impact statement for the proposed action.
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For further details with respect to the proposed action, see the licensee's letter dated March 27,1997, as supplemented by letters dated April 3. July 21, October 23, November 13, and December 12,1997, January 21, January 29, March 23, May 1, May 19, May 21, May 28, and June 12,1998, which are available for public lnspection at the Commission's Public Document Room, The Gelman Building,2120 L Street, NW., Washington, DC, and at the local public document room located at the University of New Orleans Library, Loulslana Collection, Lakefront, New Orleans, LA 70122.
Dated at Rockville, Maryland, this 30th day of June 1998.
FOR THE NUCLEAR REGULATORY COMMISSION John N. Hannon, Director Project Directorate !V-1 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation S
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