ML20247D988

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Operations Rept of Army Matls & Mechanics Research Ctr Nuclear Reactor Facility,Rept 4,Jan-Dec 1967
ML20247D988
Person / Time
Site: 05000047
Issue date: 12/31/1967
From:
ARMY, DEPT. OF
To:
Shared Package
ML20244A667 List:
References
FOIA-89-315 NUDOCS 8909150178
Download: ML20247D988 (6)
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L ~ E ~ l it ' *i:., w 2 OPERATIONS REPORT OF THE ARMY MATERIALS AND MECHANICS RESEARCH CENTER f NUCLEAR REACTOR FACILITY (LICENSE R-65, USAEC DOCKET 50-47) i REPORT NO. 4 f JANUARY 1, 1967 TO DECEMBER 31, 1967 !i agj. i 4 r NUCLEAR RESEARCH LABORATORY I? ARMY MATERIALS AND MECHANICS RESEARCH CENTER m n%? -f i. WATERTOWN, MASSACHUSETTS a ; t. ev k fb

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' MI pu m l I ,[ j II. CHANGES Secondary Coolant System I y A second double cell coolant tower and a second 1000 gpm pump has been ded to the system. The secondary flow is controlled pneumatically, based j an indication of primary exit temperature from the heat exchanger. The installation of the second tower does not change our previous system since 'econdary flow follows the demand from the primary coolant temperature and l oes not constitute an unreviewed safety question. It is not considered i ecessary to require any physical limitations on the second tower and pump to prevent their use during reactor operation because such use would not l cffect safety of operation. (See Figure 3) ? ,I i.' ' ' yy5'j'~"mqfy W"eq*M:n~* ~95y92~WW~ p i,i ?'sjy. y , n.fgQ~,p.: g g-n, w ( h fl g.r e ..y n 8s@l3.y1 e C~Y[ 1 & n % g, % ( J., - khDQf } 'f pRn ~ ~ " '

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Figure 3. SECONDARY COOLANT TOWERS I B. Primary Coolant System i 1. A parallel primary coolant system to the existing one shown in Figure II-B of OMRO Publication No. 7 has been installed. The present system is shown in the new SAR, Figure IV-A. If the reactor was critical or slightly suberitical and the second pump turned on, an incident like a " cold water accident" could result. Provid,ed steps are taken to prevent the use.of the second system, there is no unreviewed safety question. The question remains as to whether the fact that another pump and heat exchanger is available changes the previous system. The answer rests on the degree to which the new system must be isolated from the old. We have valved off the new system and removed the valve handles. Also padlocked off the electrical power for the pump. (See Figure 4) 4 r3 [. ) _ii______.__

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r Vh. ..i I i,0 D. 4,.g c. !N U k !I i p). c y i g at. t a (< E W3 ~' ^ y .3-w 4 l .A.. g.; f, 19-066 94/AMC.68 Figure 4. PRIMARY COOLANT SYSTEM t I C. Stainless Steel Liner Plans to install this liner were reported to the AEC in Operations Report No. 3. It is not considered to result in an unreviewed safety question or to basically change the facility. (See Figure 2) I D. Beam Tubes l The beam tubes have been changed to allow installation from the outside of the biological shield. Beam tube sizes remain the same so that reactivity effects of the beam tubes are the same. It is not planned to use the thimble which previously kept the volume of air near the core trapped. This may 7, result in some additional Argon 41 reaching the containment shell. If this .1 becomes a problem, the existing beam tubes vent will be connected to the (; exhaust system. Our Amendment No. 5 to our application, dated 15 December 1959, g para. 3 allows for using beam tubes differently than described, provided pre- 'Jg cautions are taken to keep effluent within limits. It is believed that this .f... change does not constitute an unreviewed safety question. 3 c.

j ~ a r-E f l y l-l- ' Pneumatic Tube System f I hiThe four 2-inch diameter pneumatic tube systens from the basement have l l n eliminated. Their elimination presents no unreviewed safety question. V } ./ Natural Convection Device 1 T b The six-inch valve to provide natural convection has been relocated l rom the manhole cover of the hold-up tanh to the side of the pedestal. This change will enhance the efficiency of natural convection by eliminating . the need to allow the hotter water in the hold-up tank to pass back through f#3 the core. This relocation does not present an unreviewed safety question. l g /)(See Figure S). l 3.): g. wg un u x L V t ....ne - -e

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.i g * .;-yl? b. { ? p:~,,;$;;'.a.-XF q s ' 2 ]. + l v u. gP _. 7;, i +:-~. ,l y-lE x p e 19-066-95/AMC-68 .S F!gure 5. N ATURAL CONVECTION DEVICE g, ,~.r G. Primary Clean-Up System gg,.c.. In August the single Barnstead NM4 side stream demineralized was re-5a placed by two Barnstead MM4 x FAC. The regeneration of these demineralizers is carried out automatically upon operator initiation. ,o ti H. Make-Up Demineralized t. In August the Barnstead MM4 make-up demineralized used for pool fill was replaced by a Barnstead cartridge type mixed bed demineralized. I. Secondary Flow Recorder In September the 0-300 gpm secondary coolant flow recorder was replaced by a dual 0-1200 gpm recorder. ~ E 1

l V u f J. Start-Up Channel { {, 1( In September the vacuum tube start-up channel was replaced by a trans-t istorized AEC Modular Start-up channel. L 5 K. Area Monitoring System 'f f In October the 6 unit area monitoring system was replaced by a trans-ic 1 istorized area monitoring system. In addition to the 6 locations monitored ? t by the old system, a monitor was placed over the fuel storage facility and g# a portable.01-1000 R/m monitoring channel was added. The area monitoring system range was increased from O'1 - 100 mR/hr to 0.1-1000 mR/hr. N

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L. Radiation Monitoring Ratemeters f In Decemb.er the vacuum tube ratemeters associated with the radiation gi m:nitors in the exhaust and coolant systems were replaced with transistorized prccision ratemeters. The detectors in these radiation monitors have also bssn replaced by new detectors which are compatible with the transistorized ratemeters. A six-hour delayed particulate monitor iras added to the stack f[j { exhaust monitor. i M. Nitrogen-16 Monitor j;; 3 In December a nitrogen-16 monitoring channel was added to the radiation A monitor:, in the reactor control room. 4 7 N. Coolant Room Entry Alarms j h In December, the doors to the coolant room were equipped with a device

i which energizes a visible alarm signal in such a manner that the individual cntering and the licensee are made aware of the entry.

f; 0. Linear Channel Trip In December the trip contacts on the micro-micro ammeter used to measure ~ linear power were wired into the slow shutdown logic when it was observed that a failure of the linear recorder at a time when it was feeding an auto-i m: tic regulating rod withdrawal error signals to the servo amplifier, could i result in a continuous regulating rod withdrawal to reg rod upper limits. P. Natural Convection Device 9 In December a float was added to the relocated natural convection device to cause the opening of a natural convection loop upon loss of pump suction, For two megawatt operation this float has been weighted so that the natural g$ convection device operates manually as shown previously in amendment No. 6 g to our license application USAEC Docket 50-47. .s III. RESEARCH PROGRAMS The experimental programs described in Operations Report No. 3 were continued during this period. j h 6 = _ _ _ _ _ _ _ -}}

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