ML19322B146

Comments on Amend 6 Re Mod in Design of Weir

ML19322B146
Person / Time
Site:	Oconee
Issue date:	04/24/1969
From:	Newark N NATHAN M. NEWMARK CONSULTING ENGINEERING SERVICES
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7912020003
Download: ML19322B146 (3)

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. (./ .s-NATHAN M NEWMARK CONSL'LTING ENGIN EERING SERV 4CES 1;;4 CivtL ENGINEER;NG But LO AG ,

una4u ituso s eisci 24 Acril 1969 Cr. Peter A. Morris Director, Division of Reactor Licensing US Atomi c Energy Conni ssi n 4ashington, D. ^. 20545 Re: Cont ract AT (49-5)-2667 Ouke Po<ce Coneany - Weir at OCONEE !;uclear Station Occkets 50-269,-270,-287 Cear Dr. Morris:

Following receipt of Ar.endrent No. 6, concerred wi th the tocic referenced acove, we reviewed the naterial pertaining to the modi fi cati ?n in the design of the wei r to orevent darage or ics' of the wei r under condi tions correspending to hign veloci ty ficv. ov . < the crest of the sub-rerged earth dar. as the water is Icwered. The design, as revised f rom the previous description of i t , arpears to be satisfactorv. Mcwever, Drs. A. J hendren and E. J. Corcing raised several questicns ccncerning sor..e of the detai ls pertaining to tne greuting cperations for the dcwns t ream s lope , uni ch I t ransni tted to ycur of fi ce cy telephone.

Tnese questions were tnen discussed in a telephcne conversaticn that I had with fir. Willian S. Lee, Vice-President, Engineering, of the Duke Powe r Ccepany on 15 April 1969, by authorizaticn f rom your staf f.

We were qui te satis fied wi th the 36 irches of rinrap extending  !

cver the en ti re dcuns t rean s lope , bedded en a 12-in. c rus ne r- run i stone Llanket as a filter. A tce drain is also provided, draining tne weir into a rock tee. Our concern was wi th th ree i tens , orinari ly ,

as fol i cs.s :

(1) There is not given in the amendment a ccmclete cescricti on  ;

of tne grouting procedure. We wanted to be sure .the grouting was dcne i in the cry so as to avoid dif ficulties wi th grout filling the drains anc j therecy caus ing di f #i cul ties wi th trapped water pressures under condi tions of racid draudown.

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(2) The description of the drains, provided through the grout I surface on the blanket to relieve uplift pressure, is not conolete enough to insure that these would operate properly. l't is important i tnat the drain holes permi t di rect access from tne 12-in. filter bed through the ricrap olanket, to avoi J build up of excess press'ures in the body of the weir (3' .We- are also concerned wi th the possibili ty of clogging the toe drain cin the' grouting operations.

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. s Dr. Feter A. tierris  ? age 2 24 April 1969 In my discussion with idr Lee, it became clear that these topics nac' been considered accouately and tnat the procedures being fol lcwed were satis factory , al tnough tney are not described concletely in the a.~endment. The grouting is being done in the dry, drain,noles are being placed on a relatively close spacing tnrough the blanket, and accitional holes will be drilled through the grout, if necessarf, after'the grouting operation is completed. The greuting is ceing done wi th a grcut nixture and crocedure that should avoid clogging cf the toe drain.

Hence, af ter this explanation was recei /ec and af ter consultaticn wi th Des. Hendron, Corcing, anc W. J. dall, we new feel that the provis ions for the suener .ed wei r ces ign are satis f actcry.

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