Palanquin Post-Shot Exploration

Transcription

1 UCFZ-ID Palanquin Post-Shot Exploration L.Meyer S. Hansen J. Toman July 28,1965 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 Livermore National Laboratow under Contract W-7405-ENG-48.

2 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 employets, makes any warranty, express or implied, or assumes any 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 necessarily constitute or imply its endorsement, recommendation. or favoring by the United States Government or any agency thereof. The views and opinions of authors exprcssed 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 producfs. Images are produced from the best available original docuizlent.

4 L. Meyer, S. Hansen, and J. Toman SLiUT.CT: Pz3 anquin PJst-Shot Exploration ItsECLASSIIFI6ATION STAMP ON REVERSE. I. O'cjective of Re-entry The purpose of t h e Palanquin post-shot exploration program i s t o o'ctai-.. data that i s needed i n t h e understanding of t h e PalanqtTin experiment, and related explosion phenomena, which can be obtained i n no ozher way. uesired d a t a can be grouped i n t o t h e following categories: The A. C e m e i r y of the True Crater Boundary and t h e Outer Boundary or t h e "Get L a s t Hole" The nost-shot exploration program outlined i n l a t e r s e c t i o n s of this memorandm a r e the best methads a v a i l a b l e f o r obtaining d a t a regar2ing the geometry of the boundary of t h e t r u e c r a t e r and t h e "Get Lost 3 k. " Ecsides determining the location of t h i s boundary, it i s desirrtble CCI describe t h e boundary c h a r a c t e r i s t i c s, i.e., its sharpness, t h e n a t c r e of the rock m a t e r i a l on both sides, and concentration of radioaczive isotopes or s l a g present there. --, 2. Yhc il'zture and Extent of Fracturing i n t h e Rock S u r r o x d i n g t h e Ti-ue CI-ater Boundary Caused by t h e Explosion T h i s category includes an evaluation of macro and micro f r a c t s r e s resultinp from the explosion, t h e i r nature, l a t e r a l extent;, and eetcrmination of t h e existence o f radioactive m a t e r i a l s i n j e c t e d vizilin them. Associated information on increased f r a c t u r e ;permeabillt:,- w i l l r e o o t a i n a ~ l cas a p a r t o f t h e f r a c t u r e evaluation program. I

5 c C. 'Tine Snmplin;: :)f' ;.:or.k a n d Mcli I n s i d e and Outside t h e Crater and " G e t Lost Hole" Houndarv I - Samples f o r microscopic, petrographic, gamma r a y and chemical anak-rsis are required t o provide information on explosion and "Get L o s t E31.e" phemmena. These ::mples will a l s o provide information on t h e d i s t r i a x i x. of r a d i o a c t i v i t y from t h e emplacement configmaxion used i n t h e Palanq3sr. exterirnent. InTorqation on t h e e f f e c t s of &he explosion on t n e "Get LCSY Hole" casing, i t s s t a t e of vaporization, e t c., w i l l be obtained 5 y stampling. 11. Why Do We Want t h e Ahove Data The c r a t e r i n g mechanisms of t h e Palanquin experiment were a t m i c a 1 i n comparison LO previously observed c r a t e r i n g shots. Judgment concerning ~ o s s i C l e causes f o r t h i s behavior o r t h e p r e d i c t i v e c a p a b i l i t y of e x i s t i n g codes w i i l 're i n c m c l u s i v e w i t h o u t some knowledge of t h e post-shot environment of the lower c a v i t y and " G e t L o s t Hole." Much of t h e physical e f f e c t s d a t a i n c h i d e d i n Section I above can be compared d i r e c t l y with pre-shot code c a l c u l a t i o n s. Sucn inr"ormation can be used t o improve or v e r i f y t h e r e l i a b i l i t y 05' e x i s t i n g conputer codes and place considerabbj higher confidence on p r e d i c t i o n s of "Get L x t Hole" Dhenomena i n f u t u r e c r a t e r i n g shots. Tne c o n s t r u c t i o n of m a c c u r a t e post-shot model by means o f t h i s exploration program w i l l impove understanding of t h e b a s i c e f f e c t s phenomena a s s o c i a t e d with a "Get L o s t Szle," provide a base f o r an empirical p r e d i c t i v e c a p a b i l i t y, and give d i r e c t i o n t o the ultimate p r a c t i c a l engineering a p p l i c a t i o n s o f nuclear explosives f i r e d m a e r biiese conditions i n hard rock media. Certainly, t h e design of a meaning321 f'ollow on e q e r i m e n t to Palanquin w i l l be extremely d i f f i c u l t and perhaps f r u i t l e s s without t h i s d a t a.

6 The plan for post-shot e-xploration i s presented i n t h e following: A. DescriDtion 1. Mine Openings -- One rectangular, v e r t i c a l, two-comfartment s h a f t 5 f't x 10 f't (constructed w i t h dimensions 01' by d r i l l and blast methods) 35,O f t deep, and one d r i f t about 550 f t long. One Gi-illing s t a t i o n srould be e s t a b l i s h e d a t 300 ft from tne siiaf; along t h e d r i f t. 2. D r i l l holes (number -- 4 t o 10; t o t a l footage -- bo0 t o 2,000 fx) m c t l d be fanned o u t from the d r i l l s t a t i o n t o the c r a t e r c a v i t y and t h e "Get Lost Hole." Holes would be approximately Nx s i z e, dimona b i t s would be used and cores would be recovered where d e s i r e d, B. 1nf'orma.tion t o be OLtained 1. Casing d e b r i s and Rad Chem samples from t h e d r i f t s and holes. 2. Visual inspection of t h e f r a c t u r e d cone o u t s i d e t h e c a v i t y. 3. Temperature and r a d i a t i o n d a t a from d r i l l holes. 4. Miscellaneous i n - s i t u physical measurements and observations SmQ2ry The one-drift exploration scheme using a v e r t i c a l 350 I't s h a f t w i l l o c f e r an escellenl. opportunity to gain a n understanding of t h e underground e f f e c c Palmquin experiment. T h i s post-shot exploration ~ l a n has t h e rezl a d v a n t a p of guaranteeing usei2ul data, since a c t u a l re-entry will be acnieved. E i s t o r i c a l l y, mined r e - e n t r i e s have been eminently more s u c c e s s f u l than d r i l l e d. re-entries. Four o t h e r plans involving d r i l l i n g and/or mining were rej e c z e d i n f i v o r of' t h i s proposal. The main unknown a t t h i s time.appears t o De whelile- o r n o t usable information on t h e lower portion of' t h e " G e t L o s t Hole" cac =e obtained u y underground diamond d r i l l i n g. One o r two samples of radioactive s l a g from the bottom portion of' t h e "Get Lost Hole" a r e needed. Also, accwaze d a t a on tlie configuration of t h e lower portions of t h e "Get Lost Hole" a r e required.

7 _, I - A mine :;iaf'i. i s f':i.>oscd over a drill. shaf't m a i n l y uecause of' s a f e c i, veniilai:on, znd Liic ability t o use l a r g e r and more ef'feczive imdergro-md equlgnent. :he Ir: t h e event t h a t a second experiment i s c a r r i e d OUT, t o f'urther e e l o r e "Gez Lost" concept as a follow-up t o Palanquin, zne shar't could be zsed?or device emplacement and the d r i f t f o r instrumentation. neeceg GO The h w e r 350 f-c provide "Get L o s t " space could be d r i l l e d as a p a r t of The new eqerinent. LFI/SH/JT/ :cpc Distribution: G. Johnson 1/10 A 2/10 A R. IIer'nst J. Knos lt/10 M. Nordyke 7/10 A 6/10 A 9/10 A G. Hl.ggins G. Werth H. Keller R. Wallstedt W. Nervik A. Holzer J. K e l l y J. Reeves J. P h i l i p 3/10 A A 5/10 A 6/10 A 10/10 A

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