ML20212L203
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E MAR 181976 Osrri;.in FroJrcc c/o :r.
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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-unicated with i.r. Pej terson by telephona. Our recct: encation to the 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
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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 uration as predicted by his t
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.
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[A MORROW 6,.782
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._ :... 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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