ML17037B837
| ML17037B837 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/28/1976 |
| From: | Kane W Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML17037B837 (8) | |
Text
~ r QCT 28 1976 DOCKET=. NO:
. 50-410 APPLICANT:
Niagara, Mohawk Power Corporation FACILITY:
Nine Mile Point Nuclear Station, Unit 2 (NMP-2)
SUMMARY
OF MEETING HELD ON OCTOBER 8, 1976 TO DISCUSS THE NINE MILE POINT NUCLEAR STATION, UNIT 2 REVETMENT-DITCH DESIGN On October 8, 1976, representatives of the Niagara Mohawk Power Corporation (NMPC) and their architect-engineer (Stone 8 Webster Engineering Corporation) met with representatives of the NRC staff to discuss the NMP-2 revetment-ditch desion.
The purpose of the meeting was to review the NMPC responses to the *NRC staff's requests for additional information and to update the status of the revetment-ditch model testing.
The discussion included areas of interest to the Hydrology-Meteorology Branch of the NRC staff.
A list of those persons who attended the meeting is included as Attachment A to this report.
ignificant points are discussed below.
'.0 NMPC Presentation
~Nd1 T
NMPC gave a summary of the model testing results to date.
Of particular relevance are the stability test results.
'Failures occurred for both the stone-faced and concrete armor unit faced revetment designs which were subjected to stability testing.
Alternate designs were also tested with somewhat more success.
NMPC suggested that the most advantageous time for staff representative to ujitness the tests would be the latter part of the u.eek-of 10/18/76 or the first part of the week of 10/25/76 based on present estimates.
It would be during this period that stability and response testing would be occurring. It was agreed that NMPC would keep the staff advised of any changes to this anticipated testing schedule.
1.2 Schedule
.='='-'
.'-;"WPC -described. the key 'events 'remaining in the revetment-ditch design schedule and the expected completion 'date as follows:
I 1.; -'Completion of'-testing - 10/22/76
'.; Completion'of 'model study report - 12/10f76
.. -.-*.,3..:. Final report to NRC staff - 2/18/77
- ..4.
Final approval from NRC staff - 4/15/77 5.
Finalize design and request bids - 6/1/77 6.'ontract award - 12/15/77 7-Start dike construction - 4/1/78
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l 3 les onses te Staff-Re uests for Additional Information
~ w One of the staff's concerns dealt in the area of potential clogging of the revetment.since NMPC was now taking credit for the permeability of the structure in dissipating wave energy.
NMPC presented data
,. which showed that overburden material starts several hundred feet offshore and was not a potential source of concern.
However, the staff suggested that NMPC look in the area of the dike on Nine Mile Point, Unit 1
as well to determine if there is any potential source of littoral material.
The staff agreed that if such materials are fine enough that they would not cause clogging.
NMPC also reviewed the staff reauests associated with establishing the peak water level for the lake.
As a result the staff noted that little had been.presented to resolve the staff's two main concerns with the NMPC analysis; These deal with whether NMPC has in fact selected the most conservative storm track and whether the grid size used in the mathematical model is fine enough to conservatively predict the water depth near shore.
,The staff suggested that before any more effort was invested by NMPC in these areas that some dis-cussions be held with the staff beforehand.
2.0 Summar and Conclusions As a result of the meeting the. following major conclusions were reached by the staff:
l.
A staff visit to witness response and stability testing should be scheduled the latter part of October 1976 to be more precisely defined by NMPC.
2.
The NMPC approach to the staff's request on clogging of the revetment structure should consider the size and disposition of the available material.
3.
Significant work remains to be performed by NMPC in establishing a design still water level less than the staff position of 254 msl and that some interaction with the staff is recommended before any addi,tional work is performed in generating a storm track or in selecting a grid size for use in the analytical model used by NMPC for predicting water level.
M. F. Kane, Prospect Management
- "-":Light Mater Reactors Branch No. -4 Division of Project Management ovrrca~
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ATTACHMENT A LIST OF ATTENDEES NRC Staff N. Fliegel E. Hawkins
-R.-Jachowski -(Consultant, Coastal Wgiaeeriaq Research.Center)
T. Johnson W.
Kane T. Nitta Nia ara Mohawk Power Cor oration S.
Manno N. Rademachhr Stone 8 Webster En ineerin Cor oration R. Borjeson Y. Chang L. Hirst
MEETING
SUMMARY
DISTRIBUTION Docket File Local PDR TIC NRR Reading (M. Groff}
LMR P4 File B. Rusche E. Case R.
Boyd R.
C.
DeYoung R. Denise D. Skovholt J.. Stol z K. Kniel
- 0. Parr S. Varga D. B. Vassallo R. Clark T. Speis
'. Collins C. Heltemes R. Houston L. Crocker J. Miller F. J. Milliams R.
Heineman H. Denton Project Manager - M. Kane
- Attorney, OELD IE (3)
M. Service ACRS (16)
Applicant
& Service List.
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Maccary Ross Tedesco Knight Pawlicki Sihweil Check Novak Rosztoczy Benaroya Lainas'ppolito Moore Vollmer Ernst Gammill Knighton Youngblood Regan
Bunch; Collins Kreger Ballard M.
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Fliegel Hawkins Johnson Kane Nitta M. Spangler J. Stepp L. Hulman-H. Smith V. Stello Log File
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