1 - Alaska Energy Data Inventory

1. Jistances ~f j,10,~nrl l~ tt h~t~een the t~n~ ·JDCl n j t h '" i ,., j t i ::1 1st ~ a rj y- s tat e ,0 t e r I e v ~ lin tho L,,,, k tl ~ y ""c~t!n USaQ to aetermin~ tne ':.~nk ared. In rry orini0n~ thisai;tanc~ in the s~fect~d design should b~ ~t le~st l~ ~ndprr'dcrrJbly ~J ft especially if the 3ir compressors dr~ tCl.)j:I controllo.d by water-level monitors.2. Th~ corners of the w~ter passages joining th~ t3nkto the tunnel shf)uld ce roun1ed esoeci'31ly to refluce n~Jdlosses for the outflows from tne tank.3. If it is feasible from structur31 and constructionvie~ pfJintJ the tunnel length connecting th8 tank to tnDtunnel should be reduced.VI. ADDITIONAL STUDIESSince the Crater Lake Powerplant will not be c()nnpctedto a larg~ grid system, it is necess~ry th;]t the pl-lnt oes t.j b leu n d e r i s a I ·01 ted 0 0 e r .3 t ion. The ref 0 r e , l! e t "I i I e ,~~o~erning stability studies are necessary to 5el~ct pr002r~alue~ ~f the generator inertia dnd the ~icket 13te noenin,and closing tirr~s. Such studies should include Doth smalland I~rle lo~d changes. 5ince the turbin~ wil I be subj~cte1to "lonor:n3.lly high pressures follOwing a major 11d1rejection due to pressure rise in the enclosed air, suchstudies are extremely necessary to determine the speed rise.Comolete turbine characteristics, and gover,ornon-linearities, such as saturation limits etc., should Deinc 1 u de 1 ins u c han a I y s e s • Air c h a mb e r s we r e use din S ma I !po,",erolants about sixty years ago in the U.S.A., but theirUSH w~s aiscontinued due to governing stabi lity prohle~s( q e f • 9 1 • [ tao pea r s t hat the s e pro b I ems '" ere c :~ use rJ a ythe tur~ine governor and were not due to the chambers.VII.5Ur-'MARY1. Except for minor modifications, the surge t3nk asdesigned should be 3dequate.2. The stability of oscillations followin'] majorchanges should be checked.load3. ~ore detailed waterhammer, soeedrise, and go~ernin~stabi lity studied are needed to determine the penstockaesign pressures, and to select the generator inertid,~icket-gate opening and closing times ~nd optimum ~overnorsettings.REFE~PJCES1. Svee, q.,"Surge Chamber with Enclosed ComDr~5se1Air Cushion," Proc.,Int. Cont. on Pr~ssure Surses,Er9fand, ')ept.,1972, puhlished by 8H;(A, Englanc, ppr;Z-15 to