ML17138A986
| ML17138A986 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 11/30/1979 |
| From: | Bivins W Office of Nuclear Reactor Regulation |
| To: | Sells D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912180005 | |
| Download: ML17138A986 (3) | |
Text
DISTRIBUTION:
DOCKET FILES (50-387/388)
NRR RDG HMB RDG Docket Nos. 50-387 and 50-388 NOV 8n 1979 THRU:
MEMORANDUM FOR:
Dooald'E. Sells, Acting Chief Environmental Pr ojects Branch No. 2, DSE L. G. Hulman, Chief Hydrology-Meteorology Branch, DSE I
FROM:
William S. Bivins, Leader Hydrologic Engineering Section, HMB, DSE
SUBJECT:
SUPPLEMENTAL HYDROLOGIC ENGINEERING INFORMlATION REQUEST-POND HILL RESERVOIR EVALUATION PLANT NAME:
Susquehanna Steam Electric Station, Units 1
and 2
LICENSING STAGE:
OL RESPONSIBLE BRANCH:
EPB82; S. Bajwa, EPM Enclosed are supplemental hydrologic engineering questions relating to the subject reservoir, prepared by N. Fliegel, which are necessitated by inadequate applicant responses to previous requests.
Responses are. needed in order for us to complete our review and provide input to the DES. If you have any questions regarding this matter, please contact M. Fliegel on extension 20028.
Ox'ig'in'al Signed by williamS. Bivj,ns William S, Bivins, Leader Hydrologic Engineering Section Hydrology-Meteorology Branch Division of Site Safety and Environmental Analysis
Enclosure:
As Stated cc:
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SUPPLEMENTAL HYDROLOGIC ENGINEERING INFORMATION REQUEST POND HILL RESERVOIR EVALUATION SUSQUEHANNA STEAM ELECTRIC STATION
'NITS
- 1. AND 2 DOCKET NUMBERS 50-387 AND 50-388 8)
Your response.to item 3 of our October 29, 1979 Information request is incomplete.
a) b)
I Indicate the proposed location of the pumping station on the flooding map.
Executive Order. 11988, Floodplain Management, requires, that before a Federal agency can allow an action on a floodplain,.
alternatives off the floodplain must be considered in detail.
Further, the agency must be able. to justify its conclusion that the only practicable alternative requires siting in the floodplain.
.Your assertion that "there is no location outside the floodplain.where a pumping plant could be constructed without altering the water conduit concept or relocating families residiog in existing dwellings," is not supported.
In. addition, you have.not shown that either altering. the, water.cooduit concept or relocating families are not practicable alternatives.
Provide detailed discussions of alternatives to the floodplain location for the pumping station and, if you so conclude, justification for the non-practicability of alternatives off the floodplain.
')
Details of the saddle dike do not appear consistant between plates 3 and 4.
a)
On both figures the top.of the. dike is stated as at elevation 990
'eet and is drawn at that elevation in plate 4.
In plate 3, however.,
the dike is shown as connecting. with. the 1005 foot.contours.
In that figure. the dike is. shown as about 450 feet long.
.A dike connecting the 990 foot contours of the hills would be only about 150 feet long.
b)
Plate.4 shows. the shoreline of the reservoir on the dike embankment when at the calculated maximum level of. 984.9 feet and.about 60 feet from the axis of the dike when at normal full.pool elevation of 981 feet.
Plate 3 shows the shoreline considerably further away for both cases.
Please clarify these apparent discrepancies.
l I
In addition, it appears from Plate.'3 that at the normal full pool elevation of 981 feet, the water surface. will be. below the riprapped dike embankment, but will impinge. upon what is labeled "zone 3 - random fill". Discuss how undermining and erosion of the toe of the dike will be prevented during times of wave attack on the random fill.