ML19322B197
| 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) | |
Text
h
~._
.\\
9 r
~
, i** ?/ ~~
-P
,+. r ; -.--[. m s -
1,, a.. ryg *,
P,: t :
M. W6YNM.
' WOM69%%%f t PAky M**, g s,. -p,gg _y-i y
p
- 77. O,.%,
w
' A7.
C v.,
m 7-5-Wr 7-w 2 A, e
_IN
. mean m..
. _ one fo.
Z CaGs CC4 OTHER:
W..t n h 1
1 ACTICN NKE5!*RY
]
CONPJ'#ENCE
]
DATE ANSWEeED:
No ACTICN NECESSARY O C ""'N' Ed O
'^
O PCST Cffigg
(!Lg cccg, U
REG. NO:
NUI MM EKa;PricN, [yo, g, uncio,,4,q) afffRRED TO
- Ltr. furni=hing comuments on the stability va.t RECEIVED BY CATE
,cf the proposed submerged W in l intake canal, relative to Duke B2wer
]g g, _ g gg m._m 97 ENCLO5URE$s i
I Tafb Conies toi L Prima A s er 7-a an nr. %
i f
""5' Distribution: 3-suppl. file cys.
h^ h' Yj r
/ (orig. In 50-269) wi I
i_{
i ELuc U. 5. ATOwC ENERGY COMISSCN MAIL CONTROL FORM Fcam *EC.226s a v, s. G O V E RNMENT PRIN TING OF FICE: 1967-259 653 (se 7912020h l
fi" ;,T.'
N ATHAN M.
NEW CONSULTING ENGINEER MARK ING SERVICES 1114 CIVIL ENGINEERING BUILDING URBANA, ILLINOIS 618o1 5 July 1967 Dr. Peter A. Morris Olvis ion of
, Director Washington, D.C.U. S. Atomic Energy CReactor Licensin ommiss ion 20S45 Re:
Submerged Weir in Int k Duke Power Co.
a e Canal
Dear Dr. Morris:
Docket Nos. 50-269
, 50-270, 50-287 of our staff, and has bThe following report concerning the stabilit is based on the een Supplement 5 of approved by Dr. W. J studies y of the proposed submer Amendment 5, by Item N
. Hall and myself.made by Dr. A. J. H (1
within the pr) essure lethe factor ged weir, as des
- o. II, dated 16 June 1967 Our ron, Jr.
cribed incomments of safety for static b hof interest, as s with the vels corresponding toshear strength of follow.
e the avior and an a Mohr failure under material equal n the angle rapid drawdown, of internal frictionenvelope to report is or greater than thatcons is tent with a of 300, for These consolidated-undrainedcohesi test technique used may not givematerial propertles be "back pressura possibility of incom l psf appear to be from theassure 100% saturationcompletely conser condit ions.
Nevertheless, ed" to p ete saturat ion
- However, cause for of immediathe samples becausesince there values the results concern.
of our may calculations, tely before shearingthey were not shcaring re(sistancecombined earthquake appears to be
- 2) For there the weight of of no the dam maximum earthquakethe sliding wedge on sloping surfaces isand rapid drawdown, the maximum ground velocityacceleration Although this is about 0.09Weffect ive each of of e larger earthquake, thesloping surfaces is5 in/sec.0.10,
the of 9 for slightly less, where W is a
maximum sliding displaconsistent value
, the to be relatively small oramount of motion estimated f
to be less than 0 4 i cement of 3) negligible.
under piping are (the It appears that earthquake n.
conditionsEven for Anothar major problems inthe appears major static stability and local flows ifsurfcco if local settleconcern is the poss ibili relation to possibilitithe resistance to the ments of this difficulty weir is the ty of eros ion es of instability.
ove rtopped. crest could occur,f o
the downstream slopi A special spillway se causing high velocity ng ct ion could avoid P003 D V
- )
. 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,
!, ~
h,
/
N. M. Newmark bjw cc:
W.
J'. Hall A. J. Hend ron, J r.
l
--=ne
-,#p.
_y.
-