ML20092A511
| ML20092A511 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/03/1992 |
| From: | Shelton D CENTERIOR ENERGY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 1993, TAC-M81298, NUDOCS 9202100138 | |
| Download: ML20092A511 (5) | |
Text
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- O h;CENTEMOR ENERGY Donald C. Shelton EM8d*"^#"
Va Preubt.Nxtea, 1*h OH 4M1 Daa,Besse (419)249 2 2 Docket Number $0 '146 1.icense Numbet NPF-3 Settal Numbr 1993 February 3, 1992 linited States Nuclear Regulatory Commission Document Control Desk Vashington, D. C.
2055$
Subj ec t s Environmental Consideration and Finding of No Significant Inipact for Davis-Besse Steam Generator Tube Sleeving License Amendment Application Gentlemen:
As requested by Mr. Jon B. Ilopkins, NRC Senior Project Manager, enclosed is a copy of the Environmental Consideration prepared for Toledo Edison's proposed amendment to Davis-Besse Nuclear rover Station Unit No. 1 Technical Specification 3/4.4.5, Steam Generators, and its 11a s es.
This proposed amendment was submitted to the NRC by letter (Scrial Number 1927) dated August 16, 1991 and vould allow the use of the Babcock and Vilcox sleeving method for steam generator tube repair.
The enclosed Environmental Consideration and Finding of No Significant Impact concludes that the proposed amendment, if approved by the NRC, vill have no significant effect on the environment.
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Docket Number 50-346 License Number NPF-3 Serial Number 1993 Page 2 Should you have any questions or requite additional information, please contact Mr. Robert V. Schrauder, Hanager - Nuclear Licensing, at (419) 249-2366.
Very truly yours, q
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cci A. B. Davis, Regional Administrator, NRC Region III J. B. Ilopkins,-NRC Senior Project Manager V. Levis, DB-1 NRC Senior Resident Inspector
-J. R. Villiams, Chief of Staff, Ohio Emergency Management Agency, State of Ohio (NRC Liaison)
Utility Radiological Safety Board y
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Docket Number 50-346 License Number NPF-3 Serial Number 1993 Enclosure I
Page 1 Environmental Consideration Identification of Proposed Action:
The proponed action is an amendment to Davis-Besse Nuclear Pover Station Unit No. 1 (DBNPS) Technical Specification (TS) 3/4.4.5. Steam Generators, and its Bases to allow the use of the Babcock and Vilcox (B6V) sleeving method.for steam generator tube repair.
The license amendment application was submitted to the Nuclear Regulatory i
1 Commission (NRC) by letter dated August 16, 1991 (Serial Number 1927).-
i The Need for the Proposed Action i
The DBNPS has two B&V once-through-steam-generators.
Although the l
DBNPS has a highly successful chemistry program, currently 20 tubes in Steam Generator 1-1 and 54 tubes in Steam Generator 1-2 have been removed from service due to tube defects.
Technical Specification Surveillance Requirement 4.4.5.4 currently states that a steam
. generator (SG) tube containing a defect is a defective tube (a defect is currently-defined as an imperfection that is equal to or greater
.than 40 percent of the nominal SG tube vall thickness).
Presently, all l
defective tubes are removed from service by plugging.
Repairs by means other than plugging are not currently addressed in the DBNPS TS.
Toledo Edison proposes to utilfre tube sleeving as an alternative to l
plugging. The advantage of tube sleeving versus tube plugging is that the tube vill remain in service with the structural integrity of the
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tube maintained and only a small reduction in flow and heat transfer 5
capabilities.. The repaired tube functions in the same manner as the original tube.
Environmental Impacts of the Proposed Action:
The proposed amendment vould allov defective SG tubes to be. repaired by the sleeving process. These repaired tubes vill have a structural L
integrity similar to their original condition.
Accordingly, accident radiological releases vill not be greater than previously determined.
Tube repair by sleeving produces individual occupational radiation doses and solid radioactive vastes approximately in the same amount as that incurred by tube plugging. Tube plugging at the DBNPS has resulted in estimated radiation exposures of 40-45 mrem per_ tube.
The l
estimated radiation exposure from installing OTSG sleeves utilizing the.
B&V sleeving process is approximately.35 mrem / sleeve, excluding equipment setup and tear down. This estimate is based on a.tubesheet l
dose rate of 10 - 15 R/hr and a minimum quantity of 100 sleeves per
.s l
-OTSG outage. This exposure is representative of what is expected in l
the future at the DBNPS, with variations expected due to slightly L
higher tube leet dose rates (16-23 R/hr at the DBNPS) and-the location
-and total number of sleeves installed. The effect on the cumulative 1
occupational radiata >n dose to plant workers is, therefore, projected l
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Docket 14 umber 50-346 1.icense !Jumbei !JPF-3 Settal Number 1993 j
Enclosute Page 2 not to be significantly different f om that discussed in Section 5.7.$.2, Occupational Radiation Exposure, of the final Environmental Statement Related to the Opet ation of the DBNPS, IJUREG-75/097, dated October, 1975.
The noimal sleeving process does not directly produce any significant indioactive vaste et etfluent.
No vater, hydraulic fluid, machining chips, etc. are genetated or expended during the sleeving process.
Some contaminated tools anu setup equipment vill i equit e dispos.al. The contaminated equipment expected to tesult from installing sleeves includes toll expanders, flexpanders, ECT probes, sleeve samples, and tube samples, Dased on the above consideration of accident radiological releases, occupational radiation exposure, and radiological effluents. Toledo Edison (oncludes that there are no significant radiological impacts associated with the NRC approval of the proposed amendment.
Vith regard to potential non-radiological impacts, the proposed amendment involves systems located entirely within the testticted aten as defined in 10 CFR part 20.
Toledo Edison has revieved the non-radiological impacts of the Final Environmental Statement Related to the Operation of the DBtJPS, NUREG-75/097, dated October 1975, and identified no impacts that vould be adversely affected by NRC approval of the proposed amendment.
Non-radiological vaste generated by the sleeving process is comparable to that generated by the existing plugging process.
It does not affect non-radiological plant effluents and has no other environmental impact.
Alternatives to the Proposed Action The principal alternative vould be to continue to repair degraded steam generator tubes by plugging rather than sleeving.
This vould not reduce the envitonmental impacts associated with the tepair of steam generator tube imperfections and vould result in reduced reactor coolant system flov, potentially leading to derating the plant.
A derating of the plant would result in the need for replacement power produced irom another generation source with a potentially rer.ultant increase in its environmental impact.
Alternative Use of Resources This action does not involve the significant use of resources not previously considered in the Final Envitonmental Statement Related to operation of the DBNpS, NUREG-75/097, dated October 1975.
1 Docket thimber 50 346 License 14 umber lipf-3 Seiial IJumber 1993 1:nclosule iI g
Page 3 Finding of !Jn Siggficant Impact Toledo Edison has reviewed the proposed license amendment against the I
etiteria of 10 CFR 51,22 for environmental review. As demonstrated in the lleense amendment application submitted by letter (Serial !Jumber 1927) dated August 16, 1991, the' proposed change does not involve a significant haralds consideration, and as discussed above the proposed change does not significantly inctease the types and amounts of l
ef fluents that tnay be teleased of f aite, nor significantly inciense individual or cumulative occupational radiation exposures.
Based on the foregeing. Toledo Edison finds that there is no significant impact on the environment and that the proposed license amendment meets the criteria provided in 10 CPR $1.22(c)(9) for a categorical exclusion from the tequirement for an Environmental Impact Statement.
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