ST e L MASTER - ";?_'OAK. RIDGE NATIONAI. LABORATORY operated by Lo o umou 'CARBIDE coarounou | '_ - U S ATOM!C ENERGY COMMISSION ORNI. TM- 128 ) TDEVELOPMENT OF FREE;E VALVE FOR USE IN THE MSRE M Rlchardson | o ;.:.fiojlce ' -Thls document contams infafmcman of a prelimlnary nature and ‘was prepared ST . -pnmaflly for internal use at the Ock Ridge National Laboratory, It is subject * to revision or correction and therefore does not represent o final reports The ~ information is not to be abstracted, reprinted or otherwise given public diss -semination without the appraval af the ORNL patent: branch Legal and Infor- S mation Contral Department. S : ‘ o R -4 » . { LEGAL NOTICE " This npon was pr-pcrod as on uccoum of Govornmom sponsored work Neither the United States, nor the Commission, nor any person ‘acting on behalf of the Commission: " A. Makes any warronty of representation, expressed or implied, with respect to_tho accurecy, completeness, or usefulness of the information centained in this teport, or that the use of - any information, cppcrufus, method ‘or proc-ss dhcloud in this report may not infringe . privately owned rights; or B. Assumes ony liobilities with rospoci 1o the use of, or for dcmugn resulting from chc use of any informatich, apporatus, method, or process disclosed in this report. As used in the above, “person acting on beholf of the Commission® includes any employee or contractor of the Commission, or empleyee of such eomraefor, to the sxtent that such employee or contractor of the Commission, or smployee of such contracter prepares, disseminates, or provides access to, any information pursuant to lns .mploymom or contract with the Commission, or his employment with wch controctor. - Ay “v-—-'—‘-'t it * e g s AU el 111t a2 e AR 7 UL "y “"j - . oo ORNL-TM-128 Contract No. W-7405-eng-26 Reactor Division DEVELOPMENT OF FREEZE VALVE FOR USE IN THE MSRE M. Richardson DATE ISSUED FEB 28 1962 OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee ~operated by UNION CARBIDE CORPORATION -~ - for the U. S. ATOMIC ENERGY COMMISSION - I TN wt ‘ o "" - [_ | s of;. ABSTRACT Three types of frozen-seal "valves" were tested for possible use in the MSRE, The seal was melted by direct resistance heat, by induction heat, and by clamp-on Calrod heat. The frozen seal was made in a pre- formed restriction section of a standard piece of pipe by a cooling-gas Jjet stream directed at the restriction. All three valves performed satis- -factorily through 100 test cycles. The Calrod-heated valve was selected for MSRE use on fihe basis of simplicity of design and of operation. Two of the valves are successfully undergoing further tests on the MSRE Engineering Test Loop. cu’j ’\ n s A s : » ) ca M L - INTRODUCTION At the beginning of the Molten Salt Reactor Program a proven, reliable, mechanical valve was not available; moreover, it was decided that a develop- ment program for such a valve would not be undertaken at that time. Past ''and a experience indicated some success with a freeze-plug type "valve,'’ short evaluation program was initiated. Three types were tested in valve test stands by using reactor-quality salt at 1100 to lZOOoF, and all three types proved satisfactory for holding pressures up to 60 psig. Each valve was frozen and melted 100 times. There were no'electrical or mechanical failures. Additional experience was gained through operation of the valves incorporated in the Engineering Test Loop in Building 9201-3. TEST EQUIPMENT Two test stands were built which were identical except for the valve bodies and auxiliary heating equipment for each valve. A description of one test system will apply to both. Figure 1 shows that the system (including the valve) was vertically mounted. The total volume of the system was 5.6 gal. The sump tank was made of 6-in. sched-40 Inconel pipe and had a volume of 2.2 gal. A 3/8-in. sched-40 Inconel pipe connected the sump tank to the'l-l/z-in. INOR-8 valve body by means of a 3/8- to 1-1/2-in. INOR-8 bell reducer. The connection from the valve body to the head tank was by similar means. The head tank was made of 6-in. schethO,INOR-B;-the-volume'of this tank vas also 2.2 gal. e Salt-level indicatbfs:wéfé bf_the contact probe type and signaled by means of control-panel-mounted 1ights. The molten salt was moved from the lower to the upper tank by means of gas pressure. Hélifim'fias fisedif6r'this,pfir@ose and to provide an inert- - atmosphere blanket for,the_Salt;fl_Afsuitable'gas regulating and venting station was provided for this purpose. The system was vented to the atmos- phere through a CWS filter., UNCLASSIFIED PHOTO 36194 ISUMP TANK Fig. 1. Test Stand with Resistance-Heated Valve in Place. - ¥ & \ ¢ E‘-,i i \ . ‘\; ¥ | _ 43 « & 3 f" ¥ ' & . (£ Variac-controlled heat was applied to the tanks and piping by means of Calrod and clamshéll heaters. Average power required to maintain 1100 to 1200°F in the system was 4.5 kw. Coolant used for the freeze cycle was plant air or fan-forced room air blown across the area of the valve to be frozen. The freezing tem- perature of the salt was 800 to 850°F as measured by externally attached thermocouples located l-l/z-in. above and l-l/z-in. below the center of the valve. Analysis of the MSRE-type salt added to the valve test was as follows: Wt % ppm U Th Li Be Zr F Ni Cr Fe 5.45 6.21 9.7 L4.61 13.3 bal 35 1k0 355 TEST CYCLE The procedure used for valve tests fias as follows: 1. Maintain the average loop temperature above the melting point of the salt, with salt in the sump tank. 2. Close the equalizing valve at the gas regulating station and apply approx 8 psig of helium to the sump tank. Vent the head tank and allow salt to rise to the lower indicating probe in the head tank (approx 600 ce of salt). o 3. With zero salt flow, turn on 50 to 60 cfm of air (approx 6 1b/min) to the freeze-plug area. Maintain this air flow forrlO to 15 min to freeze. L. Reduce air flow to 7 to 10 cfm to maintain plug. 5. Apply 60 psig of gas to the head tank and maintain this pressure until system temperatures reaéh-equilib- | rium. " S o 6. Vent the ovérpféSéfiré;_eqnalize head and sump-tank - pressuré, ahd_tu;h'qff:¢obling air. o 7. Apply.pOWer td the freeze-plug ares and melt the salt. Melt-out is indicated by the head~tank probe light. 8. Turn off heat to the plug area; allow salt to run by gravity to the sump. 9. Repeat cycle. The size of the frozen area of salt was established by controlling the flow of coolant and by adjusting the heat applied to the valve body on each side of the plug. A positive seal appeared to be & plug approx 3 in. long including the transitioh zone. | - DESCRIPTION OF TEST VALVES Direct-Resistance Valve Figure 2 shows the direct-resistance-heated test valve. Table 1 lists pertinent data on the construction of this valve, Teble 1. Construction Features of Direct-Resistance Valve Material Sched 40, 1-1/2-in. INOR-8 pipe Resistivity 120 p dhm/cm at room temperature Power lugs Outboard lugs of 1/8-in. nickel plate, center lug 1/8-in. INOR-8 plate at pipe to 1/8-in. nickel plate, 3-1/4% in. x 8 in. Over-all length 14 in. between outboard lugs Cooling tube 2-in.-0D x 1/16-in.-wall Inconel tube Power Center tapped, 1 volt, 2000 amp to each outboard lug--4 kw total _ Power cable 1 MCM braided copper (four required from lugs to transformer) The fréeze-plug zone was cold formed in a press and jig to meke a ::::}(::: shaped flow restrictor in the pipe. The dimensions of the inside of the pipe after compression were 1/2 x 2-1/k in. with a 40° included angle of approach and discharge. The center-tap lug was formed and welded to and around the pipe restriction, then enclosed in the cool- ant tube. Q. O ’ 4) UNCLASSIFIED PHOTO 36193 ) ' Tig. 2. Resistance-Heated Valve. Induction~Heated Valve Figure 3 shows the induction-heated valve. Table 2 lists pertinent data on construction of this valve. | Table 2. Construction Features of Induction-Heated Valve Material 1-1/2-in. sched-40 INOR-8 pipe Over-all length 6 in. Power ’ 12-kw, 4k50-kc spark-gap generator Power comnection 1/l-in. 0.035-in.-wall, copper tube, water | cooled Coil 12-turn U-shaped coil made of l/h-in,, square copper tubing, spaced 1/16 in. 7 ) apart - The freeze-plug zone was cold formed to meke a flat, 2 in. long with a 20° angle of approach and discharge. The flats were formed on opposite sides of the pipe to make a —__>={_ _ shaped flow restrictor. Inside dimensions were 1/2 in. x 2-1/# in. x 2 in. long. The induction coil was formed to permit preferential heating toward the outer edges of the freeze plug and to fit over the 2~in. pipe flat. No part of the heating coil was - attached to or touching the pipe. The coil occupied 6 in. of pipe length and was attached to the generator by standard brass tubing fittings and 1/k-in. copper tube. Water cooling of the generator and heating coil was required when the generator was in operation. The freeze plug was formed by directing controlled air flow in a l-in. pipe between the heating coils to each of the flats. The air nozzles were spaced 6 in. from the valve. Two methods of supplying cooling air were employed: low-pressure air from a centrifugal blower piped to each valve flat with a Z-in. hose and high—préssure building air piped through a regulator and rotameter to each of the valve flats with a l-in. pipe. O L ¥ 3 Fig. 3. Induction-Heated Valve: UNCL ASSIFIED PHOTO 36123 - Sha with Coil in Position. 10 Calrod-Heated Valve - The Calrod-heated valve was made up at the completion of the induction- heated valve test. The same flattened pipe section (2-in. flats) was used by simply removing the induction coll and clamping & 1000-w lSOOOF Calrod to each flat. The 24-in. Calrods were bent into 6-in. long W-shaped units- and clamped onto the pipe. The final forming was done by heating the Calrod and tamping it into place to make a close fit to the pipe. FPower was controlled by a panel-mounted Variac. Cooling was accamplished by- blowing air across the flats in the seme manner as was used for the induc- tion valve. t Figure 4 shows the valve. Thermocouples for the test were externally welded to the valve. One thermocouple was centered on the broad face of the 2-in., flat, one was spaced 1-1/2 in. above, and one vas spaced. l-l/z‘in. below the center. RESULTS OF TEST-~VALVE QOPERATION Resistance-Heated Valve The valve was cycled 100 times without incident. A curve of melt .time vs power input is shown on Fig. 5a. Figure 5b shows heat removal vs volume rate of cooling air across the freeze-plug area. A flow of approx 8 scfm was required to maintain the plug. ' | After testing, thé valve was removed from the loop for examination. The general appearance of the valve was normal. Induction-Heated Valve The valve was cycled 100 times without difficulty and with no | apparent damage to the pipe. The average melt time was 35 sec at 12 kw. Freeze time was 10 to 15 min with 50 to 60 efm of air. A flow of approx 8 scfm was required to maintain the plug. | o Q. » i O Q) ) op » 11 Calrod-Heated Valve. UNCL ASSIFIED | PHOTO 36718 4.0 3.0 2.0 POWER INPUT (kw) 1.0 300 Q S © o D Q p[Btu het 472 CF)] 40 20 Fig. 5. Freeze Valves. UNCLASSIFIED ORNL-LR-DWG 64016 {4 ~in. SCHED- 40 INOR - 8- PIPE FREEZE VALVES | DIRECT-RESISTANCE-HEATED V RESTRICTOR {4-in. LENGTH AN '\\ | GALROD HEAT,2-in. FLAT )] RESTRICTOR,6-in. LENGTH \ 2 4 6 8 10 MELT TIME (min.) / 0.8 7= CONSTANT (W) / / Melt Time vs Power Input for Resistance- and Calrod-Heated 10 20 50 100 AIR VOLUME FLOW RATE (cfm) @) i;; L) (:r«l oy ) wd &y 13 Calrod-Heated Valve The Calrod-heated valve was cycled 100 times with no difficulty. Figure 5a shows the melt time vs power input. The average melt time was 3 min with 1.6 kw input. Again, an air flow of approx 8 scfm was required to maintain the plug. The maximum Calrod sheath temperature attained in 3-1/2 min was l300°F. No severe oxidation was apparent on the heating ele- ment. DISCUSSION OF TEST-VALVE INSTALLATION AND OPERATION A1l the valves tested performed satisfactorily, with adequate freeze and thaw times. However, the expense and complexity of the associated equipment and the operating procedures differed widely with the various types of valves. The problems associated with using a high-current - low-voltage source of power would make the direct-resistance valve cumbersome for use in a reactor system. To obtain reasonable operating voltage, & long piece of pipe was required between the electrical connections. This added length required auxiliary heat during the freeze cycle to prevent formation of an excessively large plug. It was necessary to turn off these heaters (two 1000-w Calrods) during the melt cycle to prevent burnout when the direct-resistance heat was applied. The induction-heated valve, although much faster than the others, required an expensive highAfreqaeaey generator (455 ke). The valve heated with clamped-on Calrod heaters appeared to be the best of the three types of'valvesrtested. It has the advantage of struc- tural and electrical simpllcity with adequate freezing and melting times. The two thermocouples 1ocated away from the center of the valve in : the Calrod-heated valve were useful in determining the frozen-plug size. ~ Since the thermocouples were located directly in or close to the cooling air stream, they gave a relative temperature reading only; however, once ~ the plug size and freeze point had been establlshed the thermocouple -l/2 in. above the valve center was used as the frozen-condition indicator. 14 The use of a low-pressure centrifugal blower to supply cooling air was sbandoned due to the control difficulties. The low available pressure dfop prohibited restriction of the flow without a damper cocntrol mechanism and required large air leads to the valve. DProper sizing of a blower with a variable-speed motor control and an air-volume meter would have permitted satisfactory operation. However, in the absence of this control the frozen plug was too large to permit reasonable melt times. | The use of high-pressure building air through standard controls per- mitted very close control of the valve operation as well as the use of much smaller air tubes to the valve flats. One~inch pipe was used for the air tube during the test. However, the use of smaller (approx 1/2-in.) tubing was indicated. An air supply which permits the use of small air ducts has the advantages of simplifying the control problem to a great extent-and reducing the over-all size of the valve assembly. DESCRIPTION OF VALVE INSTALTATION IN ENGINEERING TEST LOOP The Calrod-heated valve was selected for use in the MSRE on.the basis of the previously described work and was incorpofated into the hot-salt MSRE Engineering Test Loop located in building 9201-3. The valves were mounted horizontally and oriented as shown on Fig. 6. The two valves were identical and were formed from 1-1/2-in. sched-40 pipe by using the same jig (2-in. flats) as was used to form the induction- heated development valve. The valves were heated by two 1000-w Calrod circular-wound heaters as shown on Fig. 7, which also shows the location of the coolant-air nozzles. These nozzles were l/Z-in. copper tubing terminating 1 in. from the valve flats. Coolant air was supplied to the valves from the building instrument air system and was controlled-by reg- ulators and rotameters. The reference temperature thermocouple was located 1.5 in. from the center of the valve flat (shown in Fig. 6). The purpose of the valve arrangement shown in Fig. 6 was twofold: (1) To provide & common line from the operating system to the flush drain tank or fuel drain tank such that the salt flow could be directed to or from either one tenk 4 Q, .O UNCLASSIFIED ORNL-~LLR-DWG 64017 TO FLUSH DRAIN TANK TO FUEL DRAIN —-—-F R TANK > TOTAL VOLUME 3278 cc 7 ea— 4-in. PIPE CAP 4-in. PIPE CAP —am| ™ CIRCULATING SYSTEM SURGE POT SURGE POT ': REFERENGE / THERMOGOUPLE * W/I/////I/ TR 22T I///I///l/l [ : 7770 Y/ 0o | 14in, | ' 14in. | TOTAL VOLUME OF | | [ o HORIZONTAL LEG — 3ft1Y2in. =| /] SALT LEVEL IN VALVES AFTER FORCED BLOWDOWN FROM CIRGULATING SYSTEM AS SHOWN BY X~ RAY PHOTOGRAPHS. F:Lg 6. 1l.5-in. Freeze-Valve Arrangement on MSRE Engineering Test Loop. ¢T a PHOTO UNCLASSIFIED 36743 91 4*' - 17 or the other. One valve or the other will be frozen at all times depending upon the operation. (2) To ensure fifiafi sufficient salt would remain in the valve to make & positive frozen seal under all con- ditidns. The volume of the operating system is such that, when salt is moved from either of the drain tanks to the operating system, there will always be salt in the valves to make a seal.- The surge pots shown in Fig. Sa between the valves and the drain tanks make it impossible to completely empty the valves when draining the ecirculating system into the tanks. The surge-pot volumes are such that there is sufficient residual salt in the valve body to form a seal. The valve bodies would drain completely were it not for these pots. FREEZE-VALVE OPERATION AND RESULTS IN THE ENGINEERING TEST LOOP The valve to the flush tank in the Engineering Test Loop was operated with coolant salt (LiF-BeF,, 66-34 mole %) through 40 cycles without diffi- culty. After approx 1300 hr of operation the initial melt appeared to fail to open the line, but indications are that the difficulty was a plug in the line upstream from the valve. Once the drain line was clear the adjacent valve, vhich had seen the same operation conditions, operated normally. - The average freeze time was 7.5 min and required 6 to 7 scfm (approx 0.5 lb/min) air flow. Air flow required to maintain the plug was approx 3.5 scfm (approx 0.3 1b/min). The freeze cycle was accomplished with zero . salt flow in the pipe in all cases. The frozen-plug length at TOOOF reference temperature was @pprbx 3 in. The melting- time vs power input curves for-this valve are shown on Fig. 8. The difference-ihfimelt times between the 500 and TOOOF steady- state reference temperatures shows clearly the effect of the frozen-plug size. - o . Anfoperational test was performed on the Engineering Test Loop to check the operation of the valves under a forced-drain condition. The valve to 18 UNCLASSIFIED ORNL~-LR-DWG 64018 ENGINEERING TEST LOOP DATA DEVELOPMENT VALVE DATA (CALROD) © REFERENCE FROZEN,TEMPERATURE: TQO°F _ A REFERENGE FROZEN,TEMPERATURE:500°F @ REFERENCE FROZEN,TEMPERATURE: 740°F AVERAGE TEMPERATURE OF LOOP SALT:#150°F AVERAGE TEMPERATURE OF LOOP SALT:{50°F 20 O $ \. LN N LN N A - ) 4 8 12 16 20 24 MELT TIME (min) INPUT (kw) 0 Fig. 8. Melt Time of 1l.5-in. Calrod-Heated MSRE Freeze Valve. i Q, ¢ O + i 19 the fuel drain tank remained frozen while the flush-drain tank valve was melted. Five psig of helium was impressed on the circulating system to force the salt into the flush-drain tank through the valve. Gas flow was permitted to continue through the valve at the completion of the draining operation at a ratevof 2.2 scfm helium. The gas flow was then shut off, the gas pressures were equalized between the drain tank and the pump, the valve was frozen, and x-ray photographs were taken of the valve assembly. The photographs indicated that sufficient salt remained in the wvalves to form a seal (Fig. 6). The valve proved to be leak-tight when gas pressure was reapplied. DISCUSSION OF VALVE OPERATION IN THE ENGINEERING TEST LOOP Operation of the valves has been satisfactory, with the exception of the one blockage that is believed to have been due to & plug in the upstream line and not due to the wvalve design or operation. The lower cooling-air requirement for these valves compared with the earlier valves is attributed to the air nozzle being only 1 in. away from the valve flat and to the better'a1r flow to the flat that is permitted by the open-center winding of the Calrods. The surge pots appear to be ade- quate to prevent the,vélverfrcm’being blown empty during a forced dump. The equalization of gas pressures during freezing is an important opera- tional procedure for two reasons: the valve is difficult to freeze with any movement of salt due tbmdifferences4in gas pressure, and reverse gas flow just before freezing_cbuld possibly ieave a gas pocket in the valve ~ with salt on each side. CONCLUSIONS AND RECOMMENDATIONS : The Calrodéhéated‘valvé'iS-fécommended'because of its structural sim- plicity and the'51mplici£y;oflthexassociated power and control equipment. ‘The Calrod unit should be rolled in & tight coil as shown in Fig. 7 rather than the WFshaped_units_aEVWEre used for the development valve. This 1s to avoid short-radius bends and to provide better air flow. A single unit 20 "horseshoed" around the flat in & manner similar to the induction coil shown on Fig. 3 would be desirable. This would reduce the nunmber of power leads and make an easily removable unit. Cooling air requirements will depend‘on cell temperature and cooling air temperature. Two volume rates are required: a high rate to make the initial freeze and a low rate to hold the freeze. The holding flow rate controls the plug size and must be selected and kept steady to prevent a meltout from heat leakage due to insufficient cooling. Too much cooling will result in a 1arge plug and consequent ex- cessive meltout time. The holding flow rate should preferably be determined in the field since it is dependent on cell and cooling air temperatures. Surge pots having a ratio of vertical leg volume to the volume of the horizontal valve and pipe section of 2, as shown in Fig. 5a, should be in- stalled to prevent the valves from being blown empty. For a given system, operating procedures must be analyzed to determine the location of these pots. The use of high-pressure compreésed air, rather ‘than low-pressure blower-supplied air, for cooling is recommended because of easier control, smaller ducts, and smaller over-all size of the valve assembly. Recommended freeze-valve controls are: 1. 2. Manual control of power to Calrods and manual air-flow control. Interlock to prevent heat and cooling air from being applied at the same time. Once the freeze temperature has been established, the center thermocouple should be interlocked to switch automatically from high- to low-volume air flow. A high-temperature (1500°F) cutout or alarm located on the Calrod sheath. An interlock between a liquid-level probe and the - valve pover imput to prevent prolonged heating of the Calrod. Once the melt is accomplished and the salt is flowing, further heat is not needed. -} Q, VY O D u& wi 21 6. For a meltout, a single control to close off cooling air and apply power to the valve at a preset rate. There must be no salt flow through the valve, or & freeze cannot be accomplished. ACKNOWLEDGMENT The author is indebted to many members of the Molten Salt Reactor Program for their contributions to this report. Special acknowledgment is due D. Scott, J. C. Moyers, and J. L. Crowley for thelr advice and sugges~ tions. | The direct-resistance valve was designed by J. L. Crowley; the Calroa and induction-heated valve design was based on the field work done by the may predeceésors in the molten-salt field. The author wishes to express his appreciation to J. L. Crowley and W. H. Duckworth for thelr contribution in the testing of the valves. BIBLIOGRAPHY MSR Quart. Progr. Rept. July 31, 1961, ORNL-301k4, p 25. MSR Quart. Progr. Rept. July 1, 1960, ORNL-3122, p 27. A 4 ‘4 m,_ 1t - ek i 2. 3. 4. 5. 6. 7. 8. 9. 10. 11, 120 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24, 25, 26. 27, 28. 29. 30. 31. 32. 33. 34, 35. 36. . 37. 38, 39. : 40. 41. 42. 43, 44, 45. M. G. E. Adamson Alexander Beall Bender E. Se. Se F. L. G. E. J. A, ' B. R. W. E. A. H. A. L. L. H. A, A, E. P. K. E. P. H. H. 'Bo L. R. G. H. H. - S. N. C. W. P. N. P. Bettis Bettis Billington Blankenship Boch Bohlmann Bolt Borkowski Brandon Briggs Bruce Burke Cole Conlin Cook Cristy Crowley Culler DeVan Doss Douglas Dunwoody Epler Ergen Ferguson Fraas Frye Gabbard Gallsher Greenstreet Grimes Grindell Guymon Harley Harrill Haubenreich Hise Hoffman Holz Howell Jarvis 23 Internal Distribution 46, 47. 48, 49, 50. 51. 52. 53. 54, 55. 56. 57. 58. 59, 60. 6l. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72. 73, 4. 75. 76. 77, 78. - 79, 81. 82. 83. gs. 86. g8. 89, 0. ORNL-TM-128 H. Jordan R. Kasten J. Kedl W. Keilholtz S. Kirslis W. Krewson A. Lane J. Leonard B. Lindauer I. Lundin N. Lyon G. MacPherson C. Maienschein D. Manly R. Mann B. McDonald F. McDuffie K. McGlothlan J. Miller C. Miller L. Moore C. Moyers W. Nestor E. Northup R. Osborn F. Parsly Patriarca R. Payne M. Perry B. Pike L. Redford Richardson C. Robertson K. Roche W. Rosenthal W. Savage - W. Savolainen Scott J. Skinner M. Slaughter N. Smith , G. Smith Spiewak Squires . A. Swartout 91l. A. 22. J. 93. R. 94. D. 95. W. 96. B. 97. B. 98. A. 99, J. 114~128. 129. 130-131. 24 Toboada 100. L. V. Wilson R. Tallackson 101. C. E. Winters E. Thoma 102. C. H. Wodtke B. Trauger 103-104. Reactor Division Library C. Ulrich 105-106. Central Research Library S. Weaver 107-109. Document Reference Library H. Webster 110-112. Laboratory Records M. Weinberg 113. Laboratory Records (LRD-RC) H. Westsik External Distribution Division of Technical Information Extension (DTIE) Research and Development Division, ORO Reactor Division, ORO O * O e