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rC, IAEA-R-1399-F
Demonstration of an instrumental technique in the measurement of solution weight in the accountability vessels of a fuel reprocessing plant
îf'r 15 November 1973 - 30 November 1976
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Kentaro Nakajima
Power Reactor and Nuclear Fuel Development Corporation, Tokai Works Tokyo, Japan
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FINAL REPORT OF IAEA u-\ RESEARCH CONTRACT No. 1399/R1/R.B il lui \-?:\ ••*>
DEMONSTRATION OF INSTRUMENTAL TECHNIQUE IN THE MEASUREMENT OF SOLUTION WEIGHT IN THE ACCOUNTABILITY VESSEL OF A FUEL REPROCESSING PLANT
MARCH 1977
POWER REACTOR & NUCLEAR FUEL DEVELOPMENT CORPORATION TOKYO JAPAN
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CONTENTS
Summary 1 Description of research carried out 2 1. Introduction 2
2. Preliminary Preparation 4 3. Calibration of volume measurement using diptube manometer system 14 4. Calibration of mass measurement using strain-gage load cell system 25 5. Comparison of accuracy between drip tube manometer system and strain gage load cell system 35 •ÏI 6. Actual measurement at uranium cold run 38 7. Evaluation for tamper-proof system 43 Results obtained and Conclusions drawn 45 H
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Summary
Research Contract No. 1399/Rl/RB
Title of Project :
Demonstration of instrumental technique in the measurement of solution weight in the accountability vessel of a fuel reprocessing plant.
Institute where research is being carried out : Reprocessing Construction Office, Tokai Works, Power Reactor te & Nuclear Fuel Development Corporation (PNC), Tokai-mura, Naka-gun, Ibaraki-ken, Japan.
Chief scientific investigator : Kentaro Nakajima.
Time period covered : Nov. 1973 ^ Mar. 1977.
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Description of research carried out 1. Introduction
Current technique for measurement of the quantity of •ma--. radioactive solution in a reprocessing facility vessel is a volumetric one by diptube manometer system.
This system has inherent uncertainties and is not readily automated within the desired limit of precision. If weighing of the important accountability vessel such as input and plutonium product vessels could be accomplished with an accuracy and precision better than the volumetric method, a significant advantage in term of measurement and control of special nuclear materials for accountability purpose could result.
The feasibility study of determining the content of the input accountability vessel and the plutonium product accountability vessel by a weighing technique had been carried out under IAEA research contract No. 1143/RB, 1972, so following results were obtained, i) Overall weight measuring error of nuclear fuel solution
in the input weight measuring vessel and the plutonium product storage vessel has been able to be made less than 0.1M).15% F.S. ii) For the plutonium product accountability vessel the
overall measuring error has been less than 0.2M).3% F.S., 11: although the ratio of net to tare weight of the vessel is relatively low (0.23) and the stiffness of the piping
piping is high,
iii) The overall accuracy has been able to be maintained
- 2 - r under gamma radiation with the maximum accumulated
exposure of 109 Rad. iv) This system allows fully automatic weight measuring operation and complete tamper-proofing has been able to be accomplished.
According to above feasibility study result, this sys- tem were installed to three vessels such as input accounta- bility vessel, plutonium product accountability vessel, and plutonium product storage vessel in PNC reprocessing plant, w: and the demonstration has been carried out. This research is consisted two parts. Phase I and Phase •ft"-" II. Phase I is Preliminary Preparation and at Cold Run and I i Phase II is at Hot Run. Phase I has been covered from November 1973, to March 1977.
><•' • These items are shown as follows. (i) Preliminary preparation of strain-gage load cell, (ii) Calibration of volume measurement using diptube
manometer system, i; "•.'-•- (iii) Calibration of mass measurement using strain-gage
load cell system, (iv) Comparison of accuracy between diptube manometer system and strain-gage load cell system, (v) Actual measurement at Uranium Cold Run. £•, '. . (vi) Evaluation for tamper-proof system.
% •M- - 3 - 2. Preliminary Preparation (i) Instrumentation for volume measurement Input accountability vessel, Plutonium product
:•'/•, accountability vessel and Plutonium product storage vessel are the most strategic points for special nuclear material safeguards purpose in a reprocessing plant. 'et' The location and the synopsis are shown as Fig. 1 and Table 1 respectively.
Volume measurements and sampling for determination of special nuclear material concentration are taken in these
three vessels. For each vessel, similar procedures are 9V,1 .,' used for volume measurement. Well known procedure which is diptube manometer T system for volume measurement of the vessel in various 'fc - reprocessing plant has been taken into our PNC reprocessing h; plant also. •*<•• Typical measurement systems are shown as Fig. 2. *•-'•
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•H a ifl 0 a) Ti eu 9 i-l O ••rot p. en a •H S - - 5 - LOi. L. 60 * a o •» g m-rt C 3 O 4J 0) H tu •>-' iH PU CO H-l td CO P Pu 5 B. /S. - 6 - 1 L m DENSITY & LEVEL RECORDER M,: TEMP. INDICATOR BENSITÏ, LEVEL MilNOMETERS HNO3 FEED OUT $•• MOLING f. '• COIL**-"" " . Fig. 2(A) VOLUME MEASUREMENT SYSTEM OF INPUT ACCOUNTABILITY VESSEL - 7 - L i DENSITY & LEVEL RECORDER LEVEL DENSITY MANOMETERS I 1 T TEMP. INDICATOR from 1 PLUTONIUM TAKE OUT EVAPORATOR 1 to Pu-PRODUCT STORAGE PUMP Pu-PRODUCT ACCOUNTABILITY VESSEL Fig. 2(B) VOLUME MEASUREMENT SYSTEM OF Pu-PRODUCT ACCOUNTABILITY VESSEL - 8 - LEVEL INDICATOR i S' ': TRANSMITTERS from Pu-PRODUCT ACCOUNTABILITY VESSEL TAKE OUT Pu-PRODUCT STORAGE VESSEL ;*t '• Fig. 2(C) VOLUME MEASUREMENT SYSTEM OF Pu-PRODUCT STORAGE VESSEL - 9 - r (ii) Application of strain gage load cells Instrumentation of strain-gage load cell for three vessel were carried Out by Kyowa Dengiyo Company in Japan. These instrument system which is shown as Fig. 3, has been consisted of load cells, junction box, bridge conditioner, signal change unit, digital indicator and printer. Before mounting to the facility, inspection of load cell unit, digital indicator were carried out by PNC inspector at maker's facility. In this work, correlation between output from load cell and digital indication was estimated. - 10 - L L ?» A- &1- ••<- . i ft:' 3 ^ •H !§ JO (8 m 4J H O .«..i Sî - 11 - •Ig,^ The procedure was shown as follows. The known weight was put on load cell and outputs fron load cell and digital indication were measured, then non- linearity arid hysteresis were estimated. The results are shown as Table 2. \ After the test in maker's facility, instruments was transfered into PNC reprocessing plant and mounted to each vessels. The mounting was finished March 1975. | y "&~ • - 12 - V- J<*6r;>i ki ta CO CO CO fa fa DUC T E VE S OP dP o (^ * o o H O 1 O o o 3 EH ft CO CO CO X EH H CO CO H! fa fa "(Si- CJ S 4P <*> £3 3 H Q ÊH O o PS C* o o CU O 1 U 9U X H Hi H 3 g CO CO fa fa oCJ dP OP m m rtiu o o EH H) o o- n) CU CO u 1 CO to ij y 3 H / X fa CO / ï-'-rt" CO / H SIS E en CO 7 fa HÎ S i H I 2 | EH / w CO / EH o / H S3 '••*!, - 13 - h y-"' IP m r 3. Calibration of volume measurement using diptube manometer system i) input accountability vessel The calibration check of input accountability vessel was carried out two times. First time : at June 1974, we made calibration curves, and temperature change test calibration curve is shown as Fig. 4, Concerning temperature test, liquid temperature of input %-•"• accountability vessel was increase by means of steam jet until 65°C, volume was measured 10 minutes each and it was 3?'-'" K continued about 3 hours so that the level have not changed V: during the test. Second time : at September 1976, the calibration check was carried out under suveillance of IAEA inspectors. ?'-•'-• Procedure was following: t,: a) The measurement was carried out at room temperature using demineralized water. b) Level and density measurements [back pressure of dip- tube measurements) were carried out by high precision water manometer for each diptube with an air purge rate of 7 N«,/hr. c) The feed liquid volume was measured by standard liquid measuring tanks (the accuracy was within ±0.17% error). d) The number of calibration points were 24 points, which were 10 points of 10£ each, 4 points of 25J, each, 3 points of 100£ each, and 7 points of 500«, each. e) Twice calibration were carried out and taken when liquid was charged. - 14 - 1 § g 3 C> c) r 4 i- o e ^ r- I > § \ -\ \ s " CO \ 8 \ > L \ \ \ s Pu \ *-^ m û S I •H tH > \ 1 \ à PS OS «1 » 4 \ g S tO m - 15 - The result is shown following: Calibration equations was calicurated at 25°C. These are: i) 1(H t. 400X, Run 1 : y£ = 0.006661x2iranH2° + O.Sesgx™"1120 + 3.33 Run 2 : y* = 0.006625x2 + 0.3727x +3.29 average yl = 0.006643x2mmH2° + O.KSSx™®20 + 3.31 ii) 1500£ ^ 4000Î, Run 1 : yl = 4.1275xmmH2° - 544.2 Run 2 : y* = 4.1290x - 545.6 average yl = 4.1283xIranH2° - 544.9 and calibration curve is shown as Fig. 5. p.;- I. f: - 16 - 1 •ft* L. o s s - ^ \ \ § \ Dat a i s correcte d t 25" C \ I \ \ Lo n \ \ 4J O M 2 \ \ •a u M) *o c? \ 0 s. - 17 - 1 ii) Pu-product accountability vessel The calibration check of Pu-product accountability vessel was carried out two times at June 1974 and at November 1975. At latter time, IAEA inspectors survied the calibration works. The former calibration works were carried out following a) Calibration using demineralized water at constant temperature. b) Test with change of temperature. Using equipment were: - Weight balance (range 2.5^1001^) - Funnel - Thermometers - Polyethylene bottle of 10£ - Polyethylene bottle of 20 Jl - Water monometer - Metering glasses of 1£ and 2% - Glass syringe (200cm3) fitted with a vinyl pipe of 1.5m. Demineralized water which was used calibration was I:- stored in the vessel in cell at least 12 hours in order to keep constant temperature. Metering glasses of 1 and 21 was used to pour water in to the vessel which a fuel connected on sight hole. For each filling operation, following procedure was applied. - Filling of metering glass with 1 or 21 of water - Weighing of filled metering glass - 18 - r •&Ë1 L H - Emptying of metering glass into the vessel - Weighing of empty metering glass - Recording of the weight and volume - Perform manometer reading and recording Calibration was carried out 6 times and Results is shown as following: For the Linear Part of the Curve H=f(V) Calculation of H for given volumes, i.e. : 5, 13, 22, 30, 37, 45X, (6 points) for each calibration, by interpolation between the experimental values. Calculation of the maximum difference AH between the average value and those calculated by interpolation: The results are shown as Table 3, and the curve are shown as Fig. 6. - 19 - 1Y - o H in • 1 ro «a 2. 3 | + 1000. 1 | 1001. 1 j 999. 3 | 999. 4 | 997. 6 | 1001. 7 | a 996. 4 | ci vo co ro PO 00 m 91 o u o m <*> ro «M 0M vo VD vo vo VO vo vo + U vo VD vo ro m C*4 00 (>l 00 CM U N 1-1 1 49 8 49 7 49 5 49 8 49 7 vo 496 . 50 0 es r~ m r» m in r-t in H vo (M 1^ m H r-i + I 128 . 129 . 126 . 128 . 130 . 128 . 126 . M H (loi / rH / ro in VO S/ < /c • Averag e /s* - 20 - L. * !• t f t - 21 - Tests with change of temperature was taken as follows. Water was heated in plutonium concentration evapolator, h' then emptied into plutonium product accountability vessel. Hight at manometer was measured 3 times. W During cooling, a decrease of the differential pressure V at manometer was observed. The decrease was of about 8mm H20 when temperature decreased from 4?.°C to 30 °C. When the latter calibration, uranium solution was used. This calibration was carried out twice incharge and twice discharge and the procedure was same as the former's At the first incharge operation, a valve of the accounta- bility vessel was closed. Then the valve was opened, in that time, hight of pressure was decreased 14.5 mm H2O, so the t data had to be corrected. ï.'. Also difference value was found between at incharge and discharge such as follows. Run 1 (incharge) - Run 2 (discharge) = 390 g Run 3 (incharge) - Run 4 (discharge) = 211 g These difference were seems to be caused from vaporing of water during calibration operation, so correction was taken. These results were shown as follows. Run 1 y = 21.67xa + 19.24 mm Run 2 = 21.84x* + 13.28 Run 3 = 21.74X*1 + 16.85 Run 4 = 21.85X*1 + 14.85 21.73x£ + 17.32 average : ymm I - 22 - 1 L. iii) Pu-product storage vessel The calibration check of Pu-product storage vessel was carried out at Dec. 1973. The procedure of calibration work was same as for F, . Pu-product accountability vessel, and calibration three times and calibration curve is shown as Fig. 7. fi - 23 - L o o o o o o o o o o m CO CO o © o co o g CO I Ï o o I- o o I 1 60 \ •H V F o o O o O [I CO u UT5O \ m C M fer' i-H «M CO O x 4 \ o s"- o § "t.: o I- ,' - 24 - L 4. Calibration of mass measurement using strain-gage load cell system i) Input accountability vessel The calibration of mass measurement using strain-gage load cell system at the input accountability was carried out from April to June 1975. The experiment was consisted two parts. The former was measured mass of feed water by strain-gage load cell system at constant temperature. (normal temperature) The latter was the temperature changing test. The measurement at constant temperature was repeated s- •• 5 times. The procedure of measurement was following. a) Démineraiized water was feed into the vessel. b) The different pressure of manometer was read. c) The digital value of strain-gage load cell system was printed out. d) Standard weight of feed water was calculated from data of manometer using calibration curve. e) The standard weight and the digital value were recorded. The results are shown as Table 4. - 25 - SI en en g > 01 X ta EH o o CM r\i o o CM H CM ro CM CM H 10 HH E H r-\ CQ H 16 5 14 5 17 5 16 3 17 1 15 7 15 1 16 0 16 8 15 5 01 a> u I (0 D •o 61 5 59 5 63 0 61 5 62 0 61 2 60 4 O 61 9 61 0 60 5 eu 10 U Xi 0 3 r-l 04 CD Çiv 179 5 177 5 177 6 181 0 177 8 En 178 3 179 0 178 6 178 5 179 1 •H 0» eu D 066 3 •a •0 CM ro 2 • H e ï ••; 297 5 301 5 299 5 297 6 296 0 297 4 297 8 296 8 298 5 ? •H U u t. s' H u CM u w m 388 5 388 8 387 5 390 0 389 5 390 5 388 2 389 5 en 387 9 388 9 " •p 0 % o 3 •0 •M 299 5 298 0 298 2 297 5 296 9 295 5 298 4 299 0 298 5 295 7 •P <0 o G U 0 i ': ' |' fi - 26 - i 1 i ii) Pu-product accountability vessel The calibration of mass measurement using strain-gage load cell system at the plutonium product accountability vessel was carried out by same method as for input accountability vessel. The results are shown as Table 5. iii) Pu-product storage vessel The calibration of mass measurement using strain-gage load cell system at the plutonium product storage vessel was carried out by same method as for Pu-product accountability vessel. The results are shown as Table 6. r-V: to - 27 - 1 w en o en H 0- 5 1.3 8 1 o 0.2 9 o 0.3 0 o p o VO m CN en CN 00 o 00 o 00 00 H in VO in VO in VO m VO in r- on CN H CN CN VO in en H • >1 ro ro ro m L4.7 6 L3.6 8 (U i-H U VO ro CN H p» •P H CJ rH H in 00 on O in en o CD 0) > O CN CN H i-H rH CN CN ro rH ro CN CN CN CN CN CN CN CM CN CN o ID m rH ro VO o 00 s CO P» 00 p» VO CN 00 p» O en en en en O 00 I en o P: ro CN CN CN CN CN CN ro CN ro S. ro p« in VO VO in vo m in en CN «N CN H i-H CN CN CN ro CN H 43.0 7 en CN o in i-H p» en in in p» CD C0 m " -P 30 . 29 . 30 . 30 . 30 . 30 . 30 . 31 . 30 . 30 . VO m in o VO CN 11*8 P> p» 3 -O «H ro on en en •w ro rH •PP CJCJ)) <0 CD G CN CM H r^ CN CN CN ro H ro CN CN CN CN CN CN CN CN CN CU iw o VO CN a CN m CN VO in 00 (D CJ •P +J -H ro ro ro ro -a- en L3.3 0 L3.9 4 _, JC -a in on in O p- o H o H m 00 ro CN m 5 o VO •H -A in in in in tn VO in VO m VO •o +> U -H en 10 0» •a -H o o o o o o o o o c a 1.1 0 tn -p M oi S. W S. W S. W in S. W S. W •H S 0» C • -H Digita l Digita l Digita l Digita l Digita l D 01 Q Ru n 1 Ru n 2 Ru n 4 Ru n 5 1 Ru n 3 - 28 - 1 o o H o CM o i-H i -2. 5 | 13 6 14 1 13 7 136. 5 13 5 13 8 14 1 12 6 12 3 14 1 26 3 26 7 26 4 27 4 260. 5 26 1 27 1 27 2 27 5 26 6 (S) r4 +J iH W (D >! O M 40 5 39 6 39 4 42 2 40 7 40 5 40 9 418. 5 40 5 40 5 CD 10 se s 568. 5 57 4 52 5 52 2 53 4 53 4 54 0 52 5 52 6 CJ 'H 0> o *O (0 ro er> CM Ë I H O 41 7 403. 5 41 0 41 1 41 7 d) -H CL <0 -0 -P 14 0 14 0 14 1 14 5 14 0 145. 5 14 9 14 1 14 3 14 1 U 10 9 •O •* o o o o o o o o o o C Q D> +1 •• en S. W S. W S. W S. W S. W •H S t» fi • -H Digita l Digita l Digita l Digita l Digita l D en Q Ru n 2 Ru n 4 Ru n 5 Ru n 3 I Ru n 1 - 29 - L iv) Analysis of the calibration data a) Input accountability vessel Input accountability is taken normaly at about 3,000 %, then we have estimated the repeatability at this point. Following data is taken from table 4. S.W digital S.W/digital Run 1 2980 2955 1,008 Run 2 2990 2984 1,004 Run 3 2995 2982 1,004 Run 4 2985 2957 1,009 Run 5 2975 2969 1,002 X 1,005 Then, standard deviation is shown as follows, a = _ /(0.003)/( 2+(^0.001)2+(-0.001)2+(0.004)2+(-0.003)2 / = 3xl0~3=0.003 ft a = 0.3% This value is satisfactory. h- b) Pu-product accountability vessel We have estimated the repeatability for working i point of plutonium accountability vessel by same way s.'-, as for input accountability vessel. Fpllowing data is taken from table 5. - 30 - L S.W digital S.W-digital Run 1 30.5 30.52 0.999 Run 2 30.1 30.10 1.000 Run 3 30.75 30.71 1.001 Run 4 30.4 31.17 0.975 Run 5 29.5 30.77 0.959 X 0.987 m Then standard deviation is shown as follows l.012)2+(0.013)2+(0.014)î+(-0.012)2+(0.028)2 i •', a = t =./1.44xlO-"+1.69xlO-' +l.96x10-"+!.44xlQ-"+7.84x10"' -A 4 a = 1.9% c) Pu-product storage vessel Standard deviation is estimated by same way as for Pu-product accountability vessel. Following data is taken from table 6. S.W digital S.W-digital Run 1 553.5 557 0.994 Run 2 553 559 0.989 X "V Run 3 557 558 0.998 Run 4 554 556 0.996 Run 5 550 553 0.995 X 0.994 Then standard deviation is shown as follows. - 31 - va V0+(-0.005)2+(0.004)2+(0.002)2+(0.001)2 7 25xl0"6+16xlQ-6+4xlQ-6+lxl0-6 _ = 3.4 x 10"3 = 0.0034 a = 0.3% This value is satisfactory. d) Influence from temperature change The data of the digital indication valve for influence from temperature changing of input accounta- bility vessel and plutonium product storage vessel are shown as Table 7 and Table 8 respectively. - 32 - L Table 7 THE DATA OF THE TEMPERATURE CHANGING TEST FOR INPUT ACCOUNT- ABILITY VESSEL Standard Digital Indication(kg) weight (kg) 60°C 50°C 40"C 30°C 180 237 238 221 186 585 671 635 585 559 1970 2079 1986 1974 1960 2980 3060 3035 3027 3006 I Hi- . 4005 4016 4020 4020 3993 S. - 33 - Table 8 THE DATA OF THE TEMPERATURE CHANGING TEST FOR Pu-PRODUCT STORAGE VESSEL Standard Digital Indication(kg) weiqht (kg) 49°C 40°C 30°C 141 146 148 147 301 314 305 300 389 392 403 403 531 545 542 536 675 690 691 691 ?•.-: Il t.- - 34 - ~1 b 5. Comparison of accuracy between diptube manometer system and strain-gage load cell system f Following data is shown that both measurment data by *?„•- dip tube system and strain-gage load cell system of in-put accountability vessel calibration. Strain gage ,. . Dip tube/mmH m (kg) {mmH20) §•• Standard digital iindicationiidicati reading volume Run 1 Run 2 Run 1 Run 2 (1) 1500 1490 1507 495.2 495.2 (2) 2000 z 1994 2013 617.5 617.9 (3) 2500 I 2498 2517 739.8 739.8 (4) 3000 I 3001 3021 861.2 861.3 SL .a. (5) 3500 3506 3525 982.0 982.4 (6) 4000 I 4004 4025 1103.9 1104.2 Now calibration equation of dip tube method is shown as follows, U) (nmH2O) y = 4.1283 x +544.9 Then diptube reading data is converted by the equation as follows. Dip tube Strain gage (ka) (A) Standard digital indicationKKg> converted value volume Run 1 Run 2 Run 1 Run 2 (1) 1500£ 1490 1507 1499.4 1499.4 (2) 2000£ 1994 2013 2004.3 2006.0 (3) 2500A 2498 2517 2509.2 2509.2 (4) 3000^ 3001 3021 3010.4 3010.8 11 (5) ssoo 3506 3525 3509.1 3510.7 (6) 4000^ 4004 4025 4012.3 4013.6 The standard deviation and bias of the data/standard volume is shown as Table 9. Concerning standard deviation, both results are near 0.2% and it seems to satisfactory. - 35 - But concerning bias, there is difference between Run 1 and Run 2 of digital indication. This seems to indicate when measurement by strain-gage system is taken, it is necessary to make zero point adjustment. I V:- !'••'• - 36 - 11.. \ h.. c» <*> H (0 (0 (Q i-H 4-1 •H f • t •H J5 O o O 1 •{- •H TJ ai fi &> 0 CO-H 1 (S g G U •O 0 en •H -H M -H <*> «o -a U G •O 10 r-l CN Ol +> -H • • • U) * > O O O 4-> ai i-H ta -a CM /^ •-( c G ai D 3 es I - 37 - r 6. Actual measurements at Uranium Cold Run The uranium cold Run in PNC reprocessing plant has been carried out from September 1975 to March 1977. Actual both data by diptube manometer system and strain-gage load cell system of input accountability vessel are shown Table 10 and Table 11. Table 10 indicates the data in summer period and Table 11 is shown the data in winter period respectively. Also Table 12, indicates standard deviation of data from strain-gage digital/indication diptube reading value and its bias. by - 38 - L Table 10 ACTUAL DATA OF IN^UT ACCOUNTABILITY VESSEL AT COLD RUN (1) Diptube reading Strain-gage Date digital to) density ,. . indication(kg) 1 KKg) £,-. 1976 density volume x volume Temperature V(°C) T(°C) 1 . 5/24 1.308 2504.0 3275.2 3282 26.0 24.5 2. 5/27 1.380 3788.0 5227.4 5245 22.5 25.0 3. 5/29 1.348 3294.8 4441.4 4448 28.0 27.0 4. 5/30 1.340 2277.3 3051.6 3046 20.0 26.0 5. 5/31 1.379 4065.4 5606.2 5630 29.0 24.5 6. 6/1 1.345 3336.8 4488.0 4509 30.0 25.5 7. 6/1 1.343 3460.5 4647.5 4652 32.5 26.0 8. 6/2 1.337 3436.3 4594.3 4605 30.0 26.5 9. 6/3 1.339 3292.4 4408.5 4440 28.0 25.0 10. 6/3 1.343 3861.4 5185.9 5218 29.0 25.0 11. 6/4 1.341 3226.7 4327.0 4370 30.0 24.0 12. 6/5 1.336 3689.8 4929 6 4986 30.0 24.0 13. 6/6 1.312 3888.7 5102.0 5159 30.0 24.5 14. 6/7 1.337 3525.4 4713 5 4772 30.0 26.0 15. 6/8 1.341 4166.4 5587 .1 5625 33.0 26.0 16. 6/9 1.342 3547.1 4760 .2 4800 29.0 28.0 17. 6/10 1.340 3939.6 5279 .1 5307 31.0 26.0 18. 6/11 1.339 2906.0 3891 .1 3931 31.0 26.0 19. 6/12 1.344 3055.3 4106 .3 4148 32.0 26.0 20. 6/13 1.309 2913.3 3813 .5 3853 30.0 24.0 21. 6/14 1.340 2764.0 3703 .8 3773 30.0 25.0 22. 6/15 1.348 2972.5 4006 .9 4046 30.0 24.0 23. 6/15 1.343 3304.7 4438 .2 4481 30.0 24.0 24. 6/16 1.336 2796.6 3736 .3 3785 30.0 25.0 25. 6/17 1.336 2810.4 3754 .7 3800 32.0 23.0 26. 6/18 1.345 2654.3 3570.0 3612 30.0 25.0 27. 6/18 1.349 2994.8 4034 .0 4085 30.0 25.0 28. 6/19 1.332 2738.0 3647.0 3691 28.0 25.0 29. 6/19 1.329 2489.2 3308 .1 3341 30.0 25.0 30. 6/20 1 335 2828.4 3775.9 3832 30.0 25.0 - 39 - Diptube reading Strain-gage Date digital / 0 \ density (fc . indication(kg) 1976 density volume1 ' x volumelKg) Temperature R-.: V(°C) T(°C) 31. 6/21 1.335 2956.0 3946.3 3988 30.0 25 .0 32. 6/22 1.338 3316.0 4436.8 4487 30.0 28.0 33. 6/23 1.339 2640.6 3537.1 3570 31.0 27.0 34. 6/23 1.335 3007.8 4015.4 4051 33.0 27.0 35. 6/25 1.336 2907.6 3884.6 3917 30.0 25.5 36. 6/26 1.333 3392.6 4522.3 4574 32.0 25.5 37. 6/29 1.335 3358.0 4482.9 4515 30.0 24.5 38. 6/29 1.333 2858.5 3810.4 3829 29.0 25.5 39. 7/1 1.330 2958.3 3934.5 3973 31.0 23.5 40. 7/5 1.413 2058.0 2908.0 2948 31.0 24.5 41. 7/5 1.334 3008.0 4012.7 4053 29.5 24.5 42. 7/8 1.104 3254.9 3593.4 3601 28.0 24.5 43 . 7/9 1.092 3720.8 4063.1 4096 31.0 26.0 is V(°C) : Temperature in the vessel T(°C) : Temperature in transmitter room ft Ht\> \: v'- - 40 - Table 11 ACTUAL DATA OF INPUT ACCOUNTABILITY VESSEL AT COLD RUN (2) Diptube reading Strain-gage Date digital density ,. . indication(kg) 1977 density volume1 ' x volumeKKg) Temperature V(°C) T(°C) l- l . 1/18 1.325 3713.3 4920.1 4913 2. 1/22 1.255 3827.0 4802.9 4819 26.0 23.0 3. 1/23 1.271 1885.0 2395.8 2434 II 3128.6 3133 25.0 22.5 4• 1.315 2379.2 5. 1/24 1.314 1565.0 2056.4 2087 32.0 23.0 6 II 1.298 2506.0 3252.8 3303 34.0 23.0 II 1964.4 2549.8 2586 33.0 23.0 7• 1.298 8. 1/25 1.309 2832.0 3707.1 3727 22.5 9. 1/26 1.324 3122.4 4134.1 4144 26.0 23.0 II 3037 33.0 10• 1.312 2281.3 2993.1 11. 1/27 1.340 3002.6 4023.5 4070 12. 1/28 1.314 3786.7 4975.7 4996 29.0 22.5 13 ii 1.275 3085.4 3933.9 3908 22.5 14. 1/29 1.323 3449.4 4563.6 4585 34.0 23.0 15. 1/30 1.338 3438.8 4601.1 4623 27.0 II 4490.2 4493 25.0 23.0 16* 1.339 3353.4 17. 2/1 1.337 3354.3 4484.7 4492 25.0 23.0 18. 2/4 1.356 3121.3 4232.5 4225 25.0 23.0 19• 2/5 1.333 3324.6 4431.7 4440 27.0 20. 2/6 1.329 2944.5 3913.2 3924 29.0 23.5 21. 2/7 1.344 1476.3 1984.1 2013 28.0 24.0 22. 2/8 1.336 3578.8 4781.3 4804 23. 2/9 1.342 3833.4 5144.4 5167 28.0 24.0 V(°C) s Temperature in the vessel T(°C) : Temperature in transmitter room - 41 - "I r 1 \13 O H EH 1-3 H W O CO zH X EH E-i 197 7 ra H H CJ> J m o H H •H + Q % EH A M D 0) d) S O fo-P U C c ^ -H »0 o k-H H (d -P m E-i M DS , C-H • Q OiÛ (0 > o : Si S« •P (1) w • H w >a Q Ja n h>H O•z H oo EH u dP < u1 SLJ S^^ H CO t> C. H (0 • W 0 Q •H o H + s sD § * M mu Q«: DS c EH H •O 0 04 K h0j Ps k-H dp En H £> 01 n> -p W Q Q 1 O •P (U hi- if *"-• jfi - 42 - i I- M1-j 7. Evaluation for tamper-proof system The strain-gage load cell system was mounted in a closed rack and normally no access to it is allowed for operation. Oniy the inspector from the Safeguards Authority is permitted to inspect the printer data stored internally of the enclosure by handling the locked handle located in the ft. front and rear of the closed rack. Checking the system for operation can be performed by kk ... I,! comparing the printed data from the printer with the print I'- formed of the system typewriter, which is related to the recording as shown in Fig. 8. * Replacement of printer recording paper and periodic U inspection of the system is simultaneously accomplished at the time of inspection by the inspector and reliability of the system operation can be checked by taking appropriate preventive maintenance service. V'" ï " Next stage, we would like to demonstrate tamper-proof system and to make evaluation concerning hardware, such as maintenance problem and long period working problem, etc. u I-.' - 43 - r 1 f. 1 ï- Fig. 8 PRINTER'S PRINT EXAMPLE 00 251-10 6.20 '72 13:30 01 340.0kg 00 251-10 6.20 •72 14:00 02 80.0kg 10 251-10 6.21 •72 10:00 11 0.025kg 12 340.0kg 13 50.0kg 14 30O 90 6.22 •72 11:01 91 6.22 '72 11:10 92^-—' • NOTE: Sign code is as follows. 00 ACCOUNT 01 TARE 02 NET 10 CALIBRATION 11 ZERO 12 TARE 13 SPAN 14 RATE (calibration interval) 90 ACCIDENT 91 POWER FAIL 92 RECOVERY >.• ••'. i- - i.' SYSTEM TYPEWRITER'S Print Example Print example ACCOUNT 251-V-10 6.20'72 10:30 TARE 340.0KG at normal measuring ACCOUNT 251-V-10 6.20'72 10:00 NET 80.0KG CALIBRATION 251-V-10 6.21'72 10:00 ZERO 0.025KG TARE 340.0KG Print example SPAN 50.0KG at calibration RATE 30DAY ACCIDENT POWER FAIL 6.22'72 11:01 Print example at power RECOVERY 6.22'72 11:10 • failure . • •> - 44 - •in Results obtained and conclusion drawn 1. Results obtained The results obtained from this research are shown as follows. i) Comparison of accuracy between the diptube manometer system and strain-gage load cell system shows that both accuracy is approximately same and relative percentage m :, of standard deviation was within 0.2%. ii) Concerning data of measurement by strain-gage load cell system, there is fluctuation of bias, so it seems to be 4n necessary to adjustment of zero point or correction i of the data. iii) Data of measurement by diptube manometer system is read by operator and volume is determinated from calibration curve, so sometime miss reading occurs, otherwise, data of measurement by strain-gage load cell system is indicated by digital signal, so it can be ''0k-, avoided miss reading and is easy to tamper-proof sized. .''V'' iv) Data of measurement by strain-gage load cell at the Uranium Cold Run shows that is satisfactory, then also seems to be promising at the Hot Run. - v) In the Hot Run, measurement by strain-gage load cell system probably has to be solved effect of radiation. '/!• • - .'via. 2. Conclusion drawn This research is consisted from demonstration of two part, Phase I and Phase II. - 45 - r L In the Phase 1, there is only preparation, and results of Uranium cold run, so the conclusion is unable to be drawn at this point, we shall draw the conclusion of this research when Phase II is completed. " -- .'••• V - 46 -