ML19323E551
| ML19323E551 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 05/09/1980 |
| From: | Lear G Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8005230741 | |
| Download: ML19323E551 (3) | |
Text
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- E!DR/CDU:1 FOR: Robert L. Tedesco, Assistant Dieector for Licensing, DL FRO:1:
George Lear, Chief Hydrologic and Gaotechnical Engineering Cranch, DE SUPJECT:
!!YDROLOGIC C :GIriEERI!!G FLO30PLAII;S !W: AGE!:E!!T QUESTIO::S FOR SH03EPR;?.U^ LEAR P01.'ER STATIO!!
Enclosed are hydrologic engincaring c,uestions concerning floodplain r.anage-tent for your trans.iittal to the applicants.
Responses to these questions are needid in order for us to conpleta car review and provide the evaluation of ficodplain effects called for in Executive Order 11938.
Orl !n.:l ei;:::d by Georga l'est George Lear, Ch.cf Ilydrologic and G20 technical Engineering Cranch Division of Engineering
Enclosure:
As Stded cc:
J. Knight G. Lear
!!. Givins
!!. Fliegel R. Ccdell 4
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Id,e'nt, icy memo wag hnt regarding Virgil C. Summer Nuclear Power Station, Unit 1j p
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HYDROLOGIC ENGIliEERING GENERIC QUESTIONS RELATING TO E.0. 11988 FLOODPLAIN MANAGEMENT FOR PLANTS NEAR COMPLETION Definition (from Executive Order 11988 Floodplain Management)
Floodplain: The lowland and relatively flat areas adjoining inland and coastal waters including ficodprone areas of offshore islands, including at a minimum that area subject to a one percent or greater chance of flooding in any given year.
1.
Provide descriptions of the floodplains of all water bodies, including inter-mittant water courses; within or adjacent to the site. On a suitable scale map provide delineations of those areas that will be flooded during the one-percent chance flood.in the absence of plant effects (i.e., pre-construction floodplain).
2.
Provide details of the methods used to determine the floodplains in response to 1. above.
Include your assumptions of and bases for the pertinent parameters used in the computation of the one-percent ficod flow and water elevation.
If studir; approved by Flood Insurance Administration (FIA), Housing and Urban Development (HUD) or the Corps of Engineers are available for the site or adjoining area, the details of analyses need not be supplied. You can instead provide the' reports from which you obtained the floodplain infor-ma tion.
3.
Identify, locate on a map, and describe all structures and topographic alterations in the floodplains.
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Discuss the hydrologic effects of all items identified in 3. above.
Discuss the potential for altered flood flows and levels, both upstream and down-stream.
Include the potential effect of debris accumulating on the plant structures. Additionally, discuss the effects of debris generated from the site on downstream facilities.
5..
Provide the details of your analysis used in response to 4. above.
The level of detail is similar to that identified in item 2. above.
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