ML20212L203
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E MAR 181976 Osrri;.in FroJrcc c/o :r. . G.. thor.?n
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'102 Vikbolandcc Gwdcu Ucar Onis:
I r69 c to the "JJ.C ::ectin': of ;' Jar.u,ry l476, churo l'r. Sobot tha cud ryccl~ turc .4 c3 ta lect. it.t.o r.a qens tion of ';es.kr detunin ; fcr 1 lote-det'n , r 23 and 2/ . ';his work was to Lo coordinated t ith !:r. V. sej tcrson of !.'oc-. ark t;ho ha-1 dern acnlysis on this subject. '1his ratter has been discucsed battreen r:c and Dr. SchottPa on sover.11 occasions, and we corm-
' Pej terson by telephona. Our recct: encation to the unicated with i.r.
project as coscribed below, tras a. creed to by all ti.rce, and I was asked to ue: unicate it to the project.
'the da ree of .'ifficulty in raking the chacra in the pinnt was considered in arrivin; at t..is reco_ren.ation. A coccihr bicchin.; two veut chnenein ruch preterable tc re<.ucinr tue uender volure nubstas.cis11 . f The possibility of abcrtenir.; the vent chanrel shcEt or breakim enrou2h
{ t;te walls of .the entrance shaf t was also considered to be a r: ore easily chna;;el veri 6ble.
In ten c of' a chaut.e to the predicted frequency of the precoure nacillation I refer to tuc attached fi .ure ccntaining ccm:utational resulto en:1c by Mr. V. rej tcrscn. !ac bar chart shouc the fundacontal and herrenic frequ-cucles for nine cases of vent-header confi turation as predicted by his uc.d el . Que infera frem this figure that ca se 3 cnd 0 represent a substantial chante frer: the 4 !!z frequency calculated for the base case 1 and verified in earlier tests. Our recorcendation, therefore, is to consiJer:
- for blo cdown Mr 23, the case 3 (in the attachr.ent) with two of the
. vent channels blocked.
- for blowdown Ur 24, the case 6, with the vent shaf t shortened by '
rc:noving part of the inlet shaf t, or breaking through the shaft inlet wall.
f /g [p i290'364 870120 FO A MORROW 6 ,.782 PDR
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MAR 181976
._ : . . . pi. 6 to c:._ walent.: t . J.:< r:.ec;./. w.~.. tion to the o ther 'I AC n. .'acra fer furth.2r es.uiceration at t:2 TAJ incetin.; cenc.'a1..J for i:tv l'//C.
Cincerely, Criginal Signed by L Siegers L. Sje..ers I,w.1:r;;c N'telo: r mt : rx:6 division of I'.eacter Sciety Reucerch
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