Neutron Prompt Burst Assembly Proposal
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1 UCRL-ID r, Neutron Prompt Burst Assembly Proposal E. R. Christie This is an informal report intended primarily for internal or limited external distribution. The opinions and conclusions stated are those of the author and may or may not be those of the Laboratory. Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livennore National Laboratory under Contract W-7405-ENG-48.
2 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, &e any warranty,express or implied, or assumesany legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessanly comtihite or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
3 DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best avaiiable original document.
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5 ..I. FperZnen%a2Requirements: Given the e-folding rate, a, fur rn arbitxary weapon assembly 8s a function of %he, it is believed ma%the probability of delay of g or mre generatioxis In Wtiet4;ing an Wfni%e chain by a s b & y source is e q M to: e-=g f t
6 - 3 - then antpbyzed w i t h respect to the experimental requircmembs of the previous section. A descript;ion of the possible methods and comments concemilogtheir appklcabili-&yto the present experiment are given below. In all =e metbcls %isteda positive a! is attxined by the rapid introduction of fissionable materia into ari slready mar-critical assembl'ly. Mter super-criticality is achieved, the system is driven sub-critical by same mechanism inherent in the pmwcu%ar assembly. was 1. Moderated Systegs: The systems irrvestigated consisted of a homogeneous modera.f;or-fuel ai.xtwre( i.e. ZrH, -4, BeO) combined A*[ - witb 8 selected pison(2.e. having a less #a l/v variation of absorption cross section. The s h u t d m mech8,nism depends on t h e Urge negative temperature coefficien%due to %he r i s e of tihe them& n e ' u t m temperature (noderator) which causes the goisoa to be p m p o r t ~ o more ~ ~ yeffec%ive. These systems were reljected for %e fuuowiilg re8soas: a. CaZcub%ionw i t h weapons codes except by Monte Car20 nethods not possible. b. Amlogy %oweapons not clear. 2, Fast Xeutmn System: In $ U s all orallby system, trsseinb3.y Lo %z super-crfticd condition is achieved by firing an o m U o y projectile through an annular ring of the same mteria3.. Shuis effected by a combination of.therm3 expansion and physical. disassembly as the projectile passes a. Rapid Disassembly, Dragon, type. on %h@. m s systera was - following xasons:
7 .... r, I b e r'godiva"% y p. Asstzabzy to pronpt cri%icprf.j_s achieved by rapfd bsefiion of an oralloy control rod in%os delayed critical szssenbly. Shutclam is achieved by them&. exparasion t o a below prompt critical configuration. This system appews to be t h e mas% desirable for the -tiation experiment: le Sixple gecmefxy is possible, 2* Theory of operation is w e l l understood. CHARACTERfSTTCS OF THE PRoposED ORAIZm AssEMBLY
8
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10 The entire assemb1y.h to be viewed through an observattoo windov during assembly to ensure that no changes i n the expx-hentiik s e t up occur durivlg remo'cz opera%ion. The 1.2 x 2 0 ' 7 burs%.eshich forced %he r e t i r a e n t of Godiva I is at-l;ribu%edto a r;mx3.7 Ramace fa3tin.g to rest again& the assezbly after the assembly area had been vacated. En view of the b s Alaaios experimce, special precautions w i l l be W e n to preclude t 3 e possibilfty of aeuidenw changes i n t m p i n g cawed by loose appa%usin t h e viciniey of the assembly. b. Interlock Sequence: The sequence of events preceeding 8 prompt critical burst can be arranged to prevent imaverknt or \aossfe assemb2y procedures. The proposed sequence of everyts is given below: BR = Burst ROa CXl, CF$ = Control Rods SB = Wety Block Source E External neutron source if no source i s already present for the experiment;. 1. &set interlocks, ( M a t i o n monitors, scram p e r (air) ma scram circuit must be on) 2. Introduce source (source must be at "IPJ" limit before +my camponents m y be mved in)( BR inoperative) 3. Raise S3 (CR, CR2 and 3R must be at "OUT" limit) 4. zhrn CR1 in (C% 5. Run in C% inoperative until C R l a t "IN" 3 h i t ) and adjust for delayed critical.. 6. Drop SB for delayed neutron cool off (CrC, cannot, be mved) (CRl can be adjusted for temp. correction) (BR circuil; is now reset, but carmot be activated) 7 - Remove s m c e ( C R 1 and C% 8* Raise SB cannot Be moved) (BR circuit now fublg. armed) key and f i r e ( b i t o r operated f a s L scmn retracts SB and BR after burst) run out circui% to re%mctcr3 and (3%. 8
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15 i PROMPT J3JRST ASSEMBLY. I
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