Environmental Impact Statement - radioactive monticello

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Environmental Impacts of Postulated Accidents other factors. A detailed cost-benefit analysis was performed for each of the 15 remaining SAMAs. The staff concludes that NMC used a systematic and comprehensive process for identifying potential plant improvements for Monticello, and that the set of potential plant improvements identified by NMC is reasonably comprehensive and, therefore, acceptable. 5.2.4 Evaluation of Risk Reduction and Costs of Improvements NMC evaluated the risk-reduction potential of the remaining 15 SAMAs. The SAMA evaluations were performed using realistic assumptions with some conservatism. NMC estimated the costs of implementing the 15 candidate SAMAs through the application of engineering judgement, use of other licensees' estimates for similar improvements, and development of site-specific cost estimates. The cost estimates conservatively did not include the cost of replacement power during extended outages required to implement the modifications, nor did they include contingency costs associated with unforeseen implementation obstacles. The staff reviewed NMC's bases for calculating the risk reduction for the various plant improvements and concludes that the rationale and assumptions for estimating risk reduction are reasonable and somewhat conservative (i.e., the estimated risk reduction is similar to or somewhat higher than what would actually be realized).. Accordingly, the staff based its estimates of averted risk for the various SAMAs on NMC's risk reduction estimates. The staff reviewed the bases for the applicant's cost estimates. For certain improvements, the staff also compared the cost estimates to estimates developed elsewhere for similar improvements, including estimates developed as part of other licensees' analyses of SAMAs for operating reactors and advanced light-water reactors. The staff found the cost estimates to be consistent with estimates provided in support of other plants' analyses. The staff concludes that the risk reduction and the cost estimates provided by NMC are sufficient and appropriate for use in the SAMA evaluation. 5.2.5 Cost-Benefit Comparison The cost-benefit analysis performed by NMC was based primarily on NUREG/BR-01 84 (NRC .1 997b) and was executed consistent with this guidance. NUREG/BR-0058 has recently been revised to reflect the agency's revised policy on discount rates. Revision 4 of NUREG/BR-0058 states that two sets of estimates should be developed-one at three percent and one at seven percent (NRC 2004). NMC provided both sets of estimates (NMC 2005a). NMC identified seven potentially cost-beneficial SAMAs in the baseline analysis contained in the ER (using a seven-percent discount rate): NUREG-1437, Supplement 26 5-8 August 2006 1
Environmental Impacts of Postulated Accidents 0 SAMA 2-enhance DC power availability by providing a direct connection from diesel generator 13, the security diesel, or another source, to the 250-V battery chargers or other. required loads. * SAMA 4-install a direct-drive diesel injection pump as additional high-pressure injection system. • SAMA 6-install additional fan and louver pair for emergency diesel generator heating, ventilation, and air conditioning. * SAMA 11--enhance alternate injection reliability by including the residual heat removal service water and fire service water cross-tie valves in the maintenance program. * SAMA 12-proceduralize the use of a fire pumper truck to pressurize the fire service water system. " SAMA 16-provide passive overpressure relief by changing the containment vent valves to fail open and improving the strength of the rupture disk. " SAMA 36--install an interlock to open the door to hot machine shop and change swing direction of door to plant administration building to divert water from turbine building 931-foot elevation east. When benefits are evaluated using a three-percent discount rate, two additional SAMAs were determined to be potentially cost-beneficial: * SAMA 39-upgrade the automatic shutdown system (ASDS) panel to include additional system controls for opposite division. * SAMA 40-add emergency level control sensor and control valve to the hotwell. NMC performed additional analyses to evaluate the impact of parameter choices and uncertainties on the results of the SAMA assessment (NMC 2005a). If the benefits are increased by a factor of 2.5 to account for uncertainties, one additional SAMA (SAMA 9, dedicated alternate low-pressure injection/drywell spray system) was determined to be potentially cost-beneficial. NMC recognized that a combination of low-cost SAMAs could provide much of the risk reduction associated with higher-cost SAMAs, and may act synergistically to yield a combined risk reduction greater than the sum of the benefits of each SAMA if implemented individually (NMC 2005a). NMC identified six low-cost SAMAs as a recommended combination of SAMAs which substantially reduces risk at Monticello for a relatively low cost of implementation. These include previously identified SAMAs 2, 11, 12, and 36, and two additional SAMAs not identified as being cost-beneficial: August 2006 5-9 NUREG-1437, Supplement 26 1
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NUREG-1437 Supplement 26 Generic En
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Generic Environmental Impact Statem
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Abstract The U.S. Nuclear Regulator
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Contents Abstract........... ......
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Contents 4.8.7 Conclusions Regardin
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Figures Figure 2-1. Figure 2-2. Fig
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Contents Table 5-1. Category 1 Issu
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Executive Summary The Commission ha
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Executive Summary NMC and the staff
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0 degree pCi microcurie(s) pCi/mL m
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Abbreviations/Acronyms IPE IPEEE J
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Abbreviations/Acronyms rem REMP RHR
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Introduction and (4) present the st
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Introduction (1) The environmental
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Introduction I assessment of the re
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Introduction This definition of pur
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2.0 Description of Nuclear Power Pl
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Description of Site and Environment
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Descfiption of Site and Environment
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Table 2-10. Land Use in Sherburne C
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Environmental Impacts of Refurbishm
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Environmental Impacts of Refurbishm
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Environmental Impacts of Operation
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Environmental Impacts of Alternativ
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9.0 Summary and Conclusions By lett
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Summary and Conclusions The GElS co
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Summary and Conclusions not reached
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z a :m G) CA, Table 9-1. Summary of
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Summary and Conclusions U.S. Nuclea
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Appendix A: Comments Received on th
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Appendix A Commenter ID Commenter A
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Appendix A A.1 Comments and Respons
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Monticello Nuclear Generating Plant
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3. General Comments Regarding Licen
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Appendix A nuclear power (I) and Mo
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Appendix A scoping process. If an i
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Appendix A Comment: The NRC does no
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Appendix A Comment: The EIS needs t
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Appendix A Comment: The EIS needs t
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Appendix A cognitive impairment. We
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Appendix A Despite available eviden
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Appendix A Comment: The Hospital Di
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Appendix A Comment: The NRC also fa
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Appendix A The NRC fails to acknowl
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the coal chain What about all the s
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gasification generation balanced ag
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Appendix A 14. Comments Concerning
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Appendix A Part II Comments Receive
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Appendix A Table A-2. (contd) Comme
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Appendix A Table A-2. (contd) Comme
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Appendix A A.2.4 General Comments i
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Appendix A Comment: Page 2-7, Line
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Appendix A turns out that we don't
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Appendix A A.2.12 Comments Concerni
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Appendix A Response: As described a
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information in the Final SEIS as pa
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Appendix A Response: The impacts to
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Appendix A Response: The text in Se
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aging management aspects of the lic
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Appendix A A-2 PURVES TODD: Just ba
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Appendix A PURVES TODD: Thank you v
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Appendix A So you don't look for wh
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Appendix A Yes CHUCK HOSTOVSKY: I t
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Appendix A information a little bit
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Appendix A Return-path: Received:
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Appendix A tAY-W8-2006 11! 07 'ENCL
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Appendix A ta W.Y United States Dep
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Appendix A MAY-17-206 13:11 P.04 U.
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Appendix A IMAY-17-20O6 13:12 P.06
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Appendix B Contributors to the Supp
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Appendix B Name Karen McWilliams Na
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Appendix C: Chronology of NRC Staff
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Appendix C May 27, 2005 May 27, 200
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Appendix C June 1,2005 June 2, 2005
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Appendix C January 23, 2006 Februar
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Appendix D Organizations Contacted
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Appendix D Wright County Assessor,
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Appendix E: Nuclear Management Comp
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Cn N0 Table E-2. (contd) Expiration
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Appendix E UNITED STATES -" NUCLEAR
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Appendix E N. Archabal -2- potentia
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Appendix E D. Stinnett -2- miles of
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Appendix E FIGURE 2.1-3 SITE BOUNDA
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Appendix E Common Name Scientific N
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Appendix E A. Stinnet : -2- ' !We a
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Appendix E 1.0 Introdution. The U.S
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Appendix E 6-M.LE SITE VICINITY Fig
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Appendix E agriculture and industri
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Appendix E -" .. " MWNTICELLO 345-K
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Appendix E Table 2. Terrestrial and
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Appendix E During the June 2005 sit
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Appendix E Vegetation management ma
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Appendix E Lehman, R.N. 2001. Rapto
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Appendix E MAY-31-206 15:31 P.02 MI
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Appendix F GElS Environmental Issue
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Appendix F References 10 CFR Part 5
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Appendix G: NRC Staff Evaluation of
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Appendix G Table G-1. Monticello Co
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Appendix G * The MACCS2 analyses pe
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Appendix G relative risk significan
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" Permanently posting an operator a
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Appendix G accident sequences to em
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Appendix G The staff noted that the
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Appendix G (testing of the boron in
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somewhat higher than what would act
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C Cn N, a) % Risk Reduction Total B
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Appendix G G.6 Cost-Benefit Compari
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Appendix G monetary equivalent of u
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Appendix G * SAMA 16- provide passi
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Appendix G several other SAMAs, res
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Appendix G Generating Plant, Docket
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NRC FORM 335 U.S. NUCLEAR REGULATOR
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