ML19322B197

Comments on Stability of Proposed Submerged Weir in Intake Canal

ML19322B197
Person / Time
Site:	Oconee
Issue date:	07/05/1967
From:	Newmark N NATHAN M. NEWMARK CONSULTING ENGINEERING SERVICES
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7912020054
Download: ML19322B197 (3)

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, - ATHAN M. _.___,,

NEW MARK CONSULTING ENGINEER ING SERVICES 1114 CIVIL ENGINEERING BUILDING URBANA, ILLINOIS 618o1 5

July 1967 Dr. Peter Olvis ion of A. Morris

, Director Washington, D.C.U. ommiss ion S. Atomic Energy CReactor Licensin 20S45 Re:

Submerged Weir in Int k Duke Po wer Co. a e Canal

Dear Dr. Morris:

Docket Nos. 50-269

, 50-270, 50-287 of our staff, and has bThe following report een concerning5 of Supplement the stabilit is based on the y of approved by Dr. W.studies J Amendment the5,proposed by Item submer N . Hall and myself.made by Dr. A. J. He (1 ron, Jr.

ged weir, as des Our within with the the pr) essure lethe factor

o. II, dated 16 June 1967 cribed incomments vels ,

corresponding toshear strength and an angle of safety for static b hof interest, as s the of e avior under follow.

a Mohr failure material equal n the reportrapid drawdown, of internal frictionenvelopewith ato is These of 300, for or greater than thatcons is tent test technique be used may not givematerial appearl to be consolidated-undrainedcohesi propertles psf "back pressura possibility p ete of incom condit ions .

Nevertheless, ed" to cause for from theassure results 100% saturationcompletely saturat ion of values However, the conser concern. of our ,

immediathe samples becausesince may there

2) For calculations,there tely before shearingthey were not shcaring the weight of re(sistancecombined of earthquake appears to be no the dam maximum earthquakethe sliding onwedge

. sloping surfaces isand rapid drawdown, the .

maximum each of the ground velocityacceleration Although of this is about 0.09Weffect

, where W isive of 9 for slightly less e be to larger earthquake, thesloping surfaces is5 in/sec.0.10 ,

, the a relatively small oramount estimated maximum sliding fdisplaconsistent value of motion

3) negligible. to beearthquake under less than n.0cement

. 4 i of piping are (the It appears that conditionsEven Anothar major major problems inthe appears for static stability and local flows ifsurfcco if local settleconcern relation to possibilitiisthethe poss ibili this difficulty the weirments is of the ty of eros ion o es resistance to ove rtopped. crest could occur,f instability. of the downstream slopi A special spillway causing se high velocity ng ct ion could avoid P003 D V

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.. . s.

(4) Avoidance of erosion due to overtopping is also possible through use of riprap of adequate thickness and size of stone. This should b2 placed on a filter layer of thickness adequata to insure that the continuity of the filter will not be interrupted. It may not be possible to have this assurance with only a 12 in, thickness of filter, unless there is careful inspection during construction.

(5) To avoid piping and to insure downstream stability under steady-state seepage, a base drainage filter and toe drain is usually required.

Although this is not shown in Amendment No. 5, it is our understanding that such a drain and filter of length about one-third the base width of the weir will be used. This will probably be adequate.

(6) Although no specific foundation treatment is indicated beyond the removal of alluvial materials, it appears to us that the foundatica will present no problems f rom the point of view of large amounts of seepage or of stability against earthquake motions of the intensity considered possible in the application.

Respectfully submitted,

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N. M. Newmark bjw cc: W. J'. Hall A. J . Hend ron, J r.

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