ML20247E003

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Operations Rept of Army Matls & Mechanics Research Ctr Nuclear Reactor Facility,Rept 5,Jan-Dec 1968
ML20247E003
Person / Time
Site: 05000047
Issue date: 12/31/1968
From:
ARMY, DEPT. OF
To:
Shared Package
ML20244A667 List:
References
FOIA-89-315 NUDOCS 8909150183
Download: ML20247E003 (6)
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OPERATIONS REPORT OF

&f TSf TIIE ARP1Y 51ATERI ALS AND SIECilANICS RESEARCll CENTER NUCLEAR llEACTOR FACILITY (LICliNSE 11-65, llSAEC DOCKET 50-47)

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REP 0ltT NO. 5

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JANUARY 1, 1968 TO DECE!!BER 31, 1968

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ks NUCLEAR RESEARCil LA!! ORA 1 DRY 3;"V.

AR.N!Y ?! ATE!11ALS AND LtECilANICS RESEARCll CENTER WATERTOWN, ?!ASSACl!USETTS 02172

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[ADDITIONALSilIM-SAFETYROD in i^

'E j Actuating switch, indicator lights, drive mechanism, position indicator Id and magnet control channel were installed for a fourth shim-safety rod. Fourth j

to be added to core at a later date preparatory to operating at power J4[

. levels greater than 2 megawatts. Additional shim-safety rod to be provided with a hold-down mechanism similar to mechanism currently in use. The excess-live magnet over current protection and the magnet control load sharing systems

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twere modified for a four rod system.

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BEAM TilBE VENTS t

E The new beam tubes, described in Operations lleport No. 4, were vented to l,

the exhaust system to reduce the amount of Argon 41 in the containment shell.

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STAINLESS STEEL POOL LINER 0

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The volume between the stainless steel liner and the concrete was connected J by a drain to the sump in order to remove any water Icakage. Such water is

~ pumped to the normal radioactive waste system.

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EXilAUST MONITORING SYSTE31 All 90* elbows removed from sample lines of the particulate and gaseous radioactivity monitors and replaced by large radius turns to improve sampling

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efficiency on particulate.

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III. RESEARCll PROGRAMS I

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Reactor Facility: Six-Inch llorizontal Beam Tube N

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h if Principal Investigt, tor:

Dr. John J. Antal,11. S. Army Materials and t.dc j

t' Mechanics Research Center Experimental Apparatus: Velocity Selector - Crystal Spectrometer

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(VSC Spectrometer) h.The j T axi Experiment: llolding a small amount of moderator material at very low

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$ cht temperature at the termination of the beam tube at the reactor core has M

pri provided a very useful source for the production of high-intensity, low.

yc pr energy neutron beams. An experimental source facility is installed in the reactor pool and allows changes in the cold source material and 4;E re dy spatial configuration. The neutron flux exiting from the source is at analyzed at this beam port for relative intensity as a function of tempera-g c'

ture, spatial configuration, wavelength distribution, etc. through the use W

of a velocity-selector - crystal spectrometer seten.

fC. Fl Use at Five Megawatts: Studies of phase transitions in Solids and Liquids ll by Inelastic Neutron Scattering.

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The addition of a rotor to chop the neutron beam from the velocity selector h

and an array of detectors to determine the angular distribution of neutrons p

scattered from sampics allows this same spectrometer to study phonon dis-M tributions in liquids or solids. An initial study is to be made on the so-called " softening" of lattice vibrational rtodos between the zine basal g

planes of :inc as the melting point of this material is approached.

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Reactor Facility: Six-Inch llorizontal Beam Tube Principal Investigators:

Dr. llenry Prask and Dr. Samuel Trevino',

Picatinny Arsenal s

Experimental Apparatus:

Fixed Scattering - Angle Time-of-Flight Spectrometer (Slow Neutron Chopper)

Experiment: Existing theories of explosive initiation indicate that the initiation of a detonation reaction in an explosive solid is a function of specific solid state processes in the material.

Preliminary experiments j

l have shown that the nature and distribution of lattice vibrational' modes in an explosive solid may be directly related to the relative ease with which an explosive may be initiated. These experiments have, for the first time, provide'd a means whereby the energy deposition and transport processes in these solids may be studied in order to arrive at a quantitative description y

of the initiation process. Experiments now planned in this area are directly 1

reinted to other explosives research studies aimed at understanding the specific solid state processes involved. Specifically, the following is

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planned.

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a.

Determine the effect of heat and radiation on the

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lattice dynamics of explosive solids.

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Determine the effect of doping and impurities on the t

lattice vibrational modes of explosives, r

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Determine the role of surface vs. hulk reactions in the r

M behavior of explosives.

i TEj The above experiments can only be done with the slow chonper (2), triple axis spectrometer (4), neutron diffractometer (5), and modified slow w

b chopper (6). Each instrument has a special application to the whole problem and adds a specific point to the total picture. These instruments provide data on film (or surface) vs. hulk scattering and phonon direction,

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dynamics. The lack of this complementary data renders it unlikely that l

an exact descr.iption of energy deposition and transport in explosive solids j

could be achieved.

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Reactor Facility: Six-Inch llorizontal Beam Tube Principal Investigators:

Dr. David R. Chipman and Dr. Laurence D.

Jennings, U. S. Army Materials and Mechanics I

Research Center p

Experimental Apparatus:

Polarized Neutron Diffractometer Experiment: Nearly all of the current information about many of our Y

structural materials are phenomenological in nature and it is becoming increasingly important to understand from both fundamental experimental and theoretical studies more about the interatomic forces which are l

actually the source of properties of materials.

The use of a polarized primary beam of neutrons in (out-of-pile) diffrac-tion experiments has proven to be a very powerful technique for ' studying the distribution of unpaired electrons in magnetic materials such as irou and nickel. These experiments are most important to the advancement of theoretical understanding of interatomic forces, the forces which hold materials together and determine important practical characteristics such as strength and hardness.

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Reactor Facility: Six-loch llorizontal Beam Tube Principal Investigators:

Dr. llenry Prask and Dr. Samuel Trevino, Picatinny Arsenal Experimental Apparatus:

Triple Axis Crystal Spectrometer

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Experiment: The discussion presented in B, listing the experiments to be 4

done, applies here as well. This equipment is complementary to the slow k

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I chopper and is required to obtain data on the phonon directions in

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terization of lattice dynamics and their relationship to explosive S.

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Reactor Facility: Six-Inch florizontal Bean Tube

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i Principal Investigators:

Dr. llenry Prask and Dr. Samuel Trevino p

Picatinny Arsenal r

Experimental Apparatus:

Neutron Diffractometer ja>

Experiment: This instrument provides supporting information on crystal 1,g-structure which is necessary for the interpretation of lattice vibrational

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spectra. As such, therefore, it is also crucial to the overall research 7;

program and will be used to a greater extent if the use factors of other instruments and increased. An increase in power level would then permit a more efficient utilization of the existing apparatus, j

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Lestar Kornblith, Jr., Assistant Director FEC' '

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'1 for Reactors. Division of C=? *3, -30

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John R. Sears, Reactor.. Inspector

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Region I, Division of Compli5nce

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l U. S. ARMY MkTERIAL RESEARCE AGENCY - MATERTCul3.amm.

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Transmitted herewith is a report on a visit to the Watertown 1j l

l Arsenal reactor.

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aThis.contimmes:.to.ha well-such operation The:caly. con--

structiver/seggestion I could make is that the health physicist-study.a mamas'4f datarmining the level (other i

i than counting the rungs in a ladder) of the licluid waste l

in ths.undergrenad'esserata.tamat.xThe backwash water from regeneration of the ion==+==ge column is allowed to decay for a few months in this tank and concrete pools are notorious leakers.

The health physicist said that he would certainly have a good answer for me cesl3qr.:mest visit.

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