ML20079R988
| ML20079R988 | |
| Person / Time | |
|---|---|
| Site: | Palisades, 07201007  |
| Issue date: | 06/02/1994 |
| From: | Bell M NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Brach E NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML18059A924 | List: |
| References | |
| FOIA-94-351 NUDOCS 9406070125 | |
| Download: ML20079R988 (4) | |
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$02 Q MEMDRANDUM FOR:
E.' William F.ach, Deputy Director Division of Industrial and m-Medical. Safe ty,191S5 FROM:
Michael.J. Bell, Chfef Engineering and Geosciences Branch Division'or Waste Management /NKSS
SUBJECT:
TECHNICAL ASSISTANCE REQUEST PALISADES INDEPENDENT SPENT FUEL STORAGE. INSTALLATION in accordance with your recent technical-assistance request Ted Johnson of D staff has evaluated technical: issues related.to the Independent Spent fuel Storage Installation (ISFSI) at the Palisades Nuclear Plant.
Input to the'
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Safets Evaluation Report in the areas.of water levels, wave action, and wind erosion has been prepared and is provided in the enclosure.
The staff intends to visit the site in the near future.
Following that site
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visit, additional review and analyses may be needed.
If you have any ' questions, please contact me at 415-7286 or Ted Johnson at 415-6658.
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\\S Michael'J. Bell, Chief Engineering and Geosciences Branch Division of Waste Management /NMSS i
Enclosure:
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DRAFT SAFETY EVALUATION INPUT PALISADES ISFSI EFFECTS OF LAKE LEVELS, WAVE ACTION, AND WIND EROSION The. staff evaluated the effects of Lake Mich'igan water levels and resultant' wave -
action on the stability of the Independent. Spent Fuel Storage installation
.(ISFSI) facility.
This evaluation included a review of previous NRC staff analyses of maximum surge levels, an assessment of the effects of wave action on K
the site and storage pad areas, and an evaluation of the potential for wind eresion to affect the ISFSI.
Lake Levels l
The level of Lake Michigan fluctuates and is generally dependent o'n long-term excesses or deficiencies of precipitation nd runoff.
Information provided by the licensee (CPC, 1972) indicates that the maximum monthly mean lake level occurred in 1886 at an elevation of 583.7 feet MSL and that the lowest monthly mean level occurred in 1964 at an elevation of 576.9 feet MSL.
Short-term variations and oscillations (seiches) occur occasionally and are caused by meteorological factors. The greatest short-term fluctuation on Lake Michigan of-about.8 feet occurred at Montrose Harbor (Chicago) in 1954.
Short-term-variations along the eastern shore of Lake Michigan are rare and are unlikely to present a problem at the plant site.
During the Systematic Evaluation Program,-the NRC staf f reevaluated the probable maximum surge elevation at the plant site. The original estimate of the maximum surge height as computed by staff consultants, the U. S. Army Corps of Engineers, was verified to be 10.9 feet (AEC, 1970)..
When ' added to a conservative coincident lake level of 582.6, the resultant probable maximum surge level was j
computed to be 593.5 ft MSL.
Plant systems, including the service water' pump motors, are designed to withstand a level'of 594.7 feet MSL.
The ISFSI facility is located approximately 450 feet from the shoreline of Lake j
The pad elevation is 624 feet MSL, approximately 30. feet above the l
probable maximum lake level. Based on a review of the difference of maximum lake levels and the elevation of the facility, the staf f concludes that water levels in Lake Michigan will have no effect on the ISFSt.
Wave Action Based on staf f experience, some wave damage and erosion can be expected to occur-along the shoreline of Lake Michigan during major storm events.
Damage from severe wave action along the Lake Michigan sho.eline is common, and some damage to the unprotected shoreline may occur in the immediate plant vicinity. However,.
since the probable maximum lake level is estimated to be approximately 593.5 feet MSL no significant damage can be expected to occur at locations which are not.
adjacent to the shoreline or are above this level. The staf f concludes that most damage will be confined to the unprotected shoreline in site area. The shoreline tsunediately fronting the plant is protected by a rock revetment and is not likely
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to be damaged significantly by large storms. ' Wave action could cause minor erosion and some sloughing of the dunes in the area; however, this damage would be confined to areas where the dunes are directly impacted by wave action.
The.!SFSI is located approximately 450 feet from the shoreline and about 30 feet above the estimated probable maximum lake level. The large dune to the north and west of the pad area will provide significant protection for the pad area and has a maximum elevation of about 703 feet MSL and a base elevation (at the pad area)
L of about 625 feet MSL.. At the western end of this dune, the elevation of the base of the steeper west-facing dune slope is about 610 feet MSL.
Based on an analysis of wave action using U. S. Army Corps of Engineers design procedures (COE, 1977; COE, 1976), the staff concludes that anv waves breaking at the shoreline would be largely. dissipated in tnat area, and any wave runup directly toward the ISFSI would reach an elevation well below the pad elevation of 624 feet MSt. Therefore, the staff concludes that the ISFSI facility will not be affected by wave action, even under the most critical and conservative conditions of lake level and wave runup.
Wind Erolip.n Wind erosion of sand dunes alor.g Lake Michigan is very common. Less frequently, areas of wind erosion, termed " blowouts", occur and can cause the displacement of large quantities of sand. These problems have been addressed by the licensee (CPC, 1994).
The licensee consulted with local ~ dune erosion. experts. who indicated that dune erosion in the site area is largely dependent on the establishment of a healthy vegetation cover on the dunes. The licensee indicated that the dunes in the site area support dense vegetation and stability is expected to be achieved in areas around the pad and any areas disturbed during construction of the ISFSI.
Quantitles' of windblown sand should be relatively minor and deposition should occur inland of the ISFSI.
The licensee also compared topographic maps and aerial surveys of the site area i
using data from 1965 and 1992 (CPC,1994). These maps indicate that very little change has occurred to the dunes in the area during that 26-year period and that the dunes continue to maintain thE same general slopes and elevations in 1992 as in 1965.
Based on review of information provided by the licensee, the staff concludes that only minor amounts of windblown sand, if any, will' be deposited in the 15FSI Further, it should be emphasized that the function of the casks will not area.
be impaired, even if completely covered by windblown' sand; day-to day surveillance and observations will be conducted and should be suf ficient to assure that removal of the deposited sands will occur in a timely manner.
Therefore, the staf f concludes that wind erosion will not be a major problem and will not impair.the safety of the ISFSI.
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3 References Consumers Power Company (CPC), " Final Safety Analysis Report," Vol.1,1972.
Consumers Power Company (CPC), "!SFSI Storage Pad Evaluation," April 5, 1994.
Consumers Power Company (CPC), " Additional Site Evaluation (preliminary)," April 20, 1994.
U. S. Atomic Energy Comission (AEC), " Safety Evaluation by The Division of Re ctor Licensing," March 6, 1970.
U. S. Army Corps of Engineers, Shore Protection Manual, 1977.
U. S. Army Corps of Engineers, ETL 1110-2-22), " Wave Runup and Wind Setup on l'eservoir Embankments," November 29, 1976.
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