Measurement of efficiency at Trinity by sampling

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The 100 Ton Shot Preparatlona -y^id^U^— eM^^^thl-' f^elijalnary to the final teat of the gadget it ia planned to ahoot 100 tone of H.£« nvla ahot la Intended to provide acoe experienee in laeesiiring large exploelons and irlll aerve aa a praotioe episode. A e radioaotlTity whleh will be eneouatered In the final ahot vill be aimlated here by dlatributing amcmg the boxes of H.E« a solution of a 100 day Hanford slug hovlag about 300 euries of aetlTity. While the geometry and the general nature at the eacploaion of this 100 toa shot differ in sereral rcoarkable respeota froa that of the final ahot« it ia expected to afford a mieh better basia for antieipating the eondltloaa of the gadget ahot than la now had. In partieulax^, ve hope to learni (1) What is the general utility of a lead ahlelded axi«jr tank (i|!|.) aa a oeana to entw the radloaotire area to obtain aaflq}lea* What ia tha extent and depth of the debria frca the orater and how does it affest the aaaeuTirabllity of the the ahieldiag of the tank. (3) What happaaa to the redioaetlTityi what fraatloa deposits auparfleially orer the ground nearby, what fraeticm la olxed with the earth thrown up froo tha the air aa& iiaperaed over a ateh alder araa« (4.) What owuat at se^egatloa takea plaea oaoag tha aevaraX f iaalos produata of poaltioaa la tha aatiTa area. In additloa» praatiea will be afforded ia tha naaipulatioa of the taak aad tha saapliag davleaa, ia tha aaaaurvaeat of the aaaplea of earth* and la the ehealeal aaalysia proeadura for astraatiag flaaioa produata froa Trialty earth. Plaaa and Stataa (A) Diaaolutioa of Banfard aiaa A auitabla lead ahiald waa avaiUbla aad thla ia baiag fitted oa a truak whiah will take it to Buford. The alug will be iaaertad ia^ the A laid there and aheold be returned to Trinity before itqr 1. A atainleaa ataal diaaolfar haa baea deai^tad and the ahep now haa tha to eoataia the diaaolw vill be atationed sai of the voodai toa«r at a diataaee aad should be ocapleted by April 15. Hie eonerate etruai

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with lead brleks (6* z 4* a 2«) and will ba sapped ^ t h aa 3« lead top made of these brloka. Thla shielding should be suffieieat to allow a working time of the order of 4 hours abore the apparatus. Tha dlsaolTar is to be preridad with a 2* tuba throiigh whieh the slug is introduead. A bad of dry lee will preteat the walls of the dlssolver from the i^Vaet of the slug whaa it falls iato the dissolwar. A sustlon device has been designed whiah traaafera tha slug froa ita ahiald oa the truak to the entranoe tuba of the dlaaolTsr. The ahop ia fabriaatlag a fuaael whleh guidee thia transfer. The tranafar dewlea will ba opsratad frta bahlad a wall aade of e(^orete brioka aad obaerwatioa will ba bf taleeeopa uaing alrrora aouated abowa the oarriar. During the diaaolwiag a atreaa of Ha or 1^ will be pasaed throu^ the solutloa by way of the laed-oat taba to ava^ the aatiwa gaaea oat of tha system aad to preraat plugging of tha laad^at. Tbe dlaaolwcr aad lead-out vill ba wound with heating alcaanta dlsalpatiag about l-aoi to aaoalarate dlsaolution* Around 2400 litara of HQ2 will ba liberated owar tha period of aolutioa eatiaated to take froa 36-43 houra* Thia 0U vill ba diluted aroaad 2-3 ^olA with Ha or 1^, thaa BiX^^ aroaad 6000 litara 1^31) haoim to diatil dariag diaaalatioa will ba praaent U tha gaa atrean. Tbe whcraaa that of 8dX ia a vi^ Miv / offar* fUm tolaraaaa doaaga ia at tha order of 51X0'^'^ aariaa/«?« flOa would entail a dilation ot 10,000. Siaoa tha gaaea will ba wwtaA at a dlataaaa at 1000 ft* froa tha dlsaolTv, it appaara that ao arraagcaaata aaad ba aeda f«r « u raeowal otii« thaa dilatica at the aad with a blower. Ibe ^ gaaea will also aarxy acae apray ilUah aay dapoalt aaor tha Teat. An area arouad tha waat (2200* diawtar) ahauld ba ropad att to prareat aoataalaatiaa of aheaa, c^ elethiagt ota. 1 aad alaa diraat haaard to paraoaaal* ~ After aalutlon of tha slag, the wolioM will ba aada ap to about 15 Utara -, by addlag aatsr aad teatlag for the lewal tgr a bubbliag teahaiaue (to be worked ca}« The ga0 laad iato tha diaaolwar aad the aaid aad gaa want leads will thca be diaaoaaeatad, aad a gaa lead eonaaetad to tha inlet aide for puaplag up the aolutioa. It ia astlaatad that 30 1^* preeaora will ba needed to piaq) the aolution up iato IV tha p U a . A M tubing ta ba aaad ia tha pile will ba aaraa tablag, 3/4* 0«Z>«, V2> i.D* axraagad ia 4 layara, 4 atriaga par layer, uader tha praaent daai^, ^ around 1/3 of tha tahiag will be outalda of the pile, or roughly 1/12 of the total ^ aetiwity will be diatribated at eeah faaa of the pile. At the foot of the tower it ia eetlnatad that tha wcrfeiag tiaa far a tolaraaaa doae (.IHl di^) will be tha cv ordar of ana hour, bat will ba eonaidtrably aora daigereua in elaae prtninity to thaaaraa tuhiag. anaa the aolution ia pmn^ai. aver. Soaa eoatx^l will hawa to ba owaiaed owar paraoaaal vorfciag aaar tha pile oasa tha aolution U ia plaaa« PtR DOC REVIEW JAN. 19/3

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- 3 - PER DOC REVIEW JAN. 19/3 Ibe plana for transferring the solution to the H.I. pile are still In an aleaentary state but in general the idea ia, force the solution out of the lead by applylag pressure above the liqiiid in the dissolver until it fills the saraa tubing and catara a glass aightlag tube under obscrratlon through a telaaeope. A waive will ba provided in the lead out whleh nlll then be closed from behind sons cozirete frotectlon* m ease of need, this valve oan be opened and the liQ.aid returned to the disaolvcr* Following is a list of the major eauipmeat which will ba ra^ylrad to aany out tha oparatioaa aantionedi 1* A aotor gaaerator to supply 3 kw for heating eqialpaittt aad other 2« A ataan gcnaratar for bending the caren tubing* 3* 4 large cylladera aaah of 1^ and aa. 4« A 4 ten eraaa for liftiag haewy ahialdiagt ata* 5* Paaaibly a ccatarlfugal oir blawar for diluting the radioeatiwa gaaea, Thla problcn will ba dlaaaaaad aeparately bcloa* 4. FMaibly 6 larga natal filled with livid lu (23 U ) far cooling trapn to adnit actiwa gpaaa. {a^m a •••lit uadar 3.) tor haldiJV tka aolatica. 3000 ft. of tubiag aad conaeatara will ba I0« Oald water Uaaa far eooliag trapa, ata« ttara era any othar aiMll itcna not iaeludad which will ba aaat to the site in tha eoaraa of tka aiparlnait aad pcx^iapa aoae bigger aqulpnaat not anticipated aowi will ba aada l a tha period April 20 • mr 1 IA whleh the diaaolvlag sad ^ ^ priim

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subsequMst puj^ping opnratlons will be tested* Ibe dissolving of the irradiated W alug and f i l l i n g of the tubas in the H.E* should take plaee In the period ^B) Modlfioatimi of Uk Tank for garnpling Had protection - It la auticipated that the radiation in the active area laay be of the ordar of 100 R/hr. in ordar to remove saaplas frosi areas where the radiation level is of this order« an M4 tank is being fitted with lead protection so that the obaorrer and driver will receive about 1/30 of the radiation outside the tank. A total of 11»000 pounds of lead will be installed by the pluoliing ehopi thay have coopletcd about half of the job at thla writing. Air Supply - Clean air will be stvplied to the obaervar and the driver by onaas of coopreaaed air tanka aounted esteroally above the engine hatch, four tanka alll provide 66o eu. ft. of alri inough for 2-1/2 hours for the two siea. this air will ba aupplicd ta the aaa through lueitc window preaaure laaaka aad will provide poaltiva preaaure proteetion a^iinat iahaliag of radioactlTc dust, oapecially dust osatainlag plutoniun. Cora DrlXX ^ Iho sanpling will be doae by naaaa of a core drill itfiich lioa baea praparadTor as \if the Indepeadeat Xzploratlon Oo. this core drill, Aich is drlwaa by a gsaollaa cagiaad •jahaay Hotor*, operatea throogjh a hole ia the botton of the tank. It takes a core bit which cuts a 2* dianetcr core* To this bit ia eot^led a core aatchar which paraita the cere to pass upward iato tha core barrel bat not ia the revarae diraatioa. The core barrel coaaa in 2* oaatlona vhlch can be coupled to oae aaother in acoriea to produac a core at arbitrary length vithia tha power at the aator. i%c co^plata outfit haa beaa ahlpped and ia axpeatad ta tha aita by April 13* Laad protected atorage apace for tha core barrala la provided aazt to the obaarrer inaide hla leed Yielded coaKadiatloB Mitoar; * Sa^lea idll be raaoved only froa areas where the level of radiation ia aafflelaatly high ao that eaaily aaaaurabfta amouata of radlaaatiwa sahataaaaa caa ba ejected to ba present, in general this meaas that the leaal af radiatlca ahould be of tha order of 1 R/hr. or more. Two radiatioa aatara vill ba placed under the tank for a eontlnuotia reading of the local inteoBity, A third, radiation aatar a l U ba arranged so that It oca be inserted in the hole aada by tha ccra drill to czplore possible stratlflcatlaa of the radioactivity* A radiatioa aetar vill ba installed oa the side of the tank to give the genwal radiation level ouUida the tank, naally, radiation aeters will be provided la the obaarvcr aad la the driver coapartaaata to giva the radiation level to which tha acn era being subjected. Bztcaalon leada to the cKtcmal aetara v l U be provided so that all reediaga aad adjastnaats oay be laadc ftca a paaal in the obaervar'a coaportacnt. fbr tha final ahot the range of the external maters must be frca .Ip/hr* to 100 R/hr. I the Intamnl aitcra froa 0.01 R/hr* to 10 R/hr. Dick Watta is aadifying his standard direct reading ionizatian aotere for external oountingj the ohaabaTpj.., -n