ML20085C500
| ML20085C500 | |
| Person / Time | |
|---|---|
| Site: | Saxton File:GPU Nuclear icon.png |
| Issue date: | 10/02/1991 |
| From: | SAXTON NUCLEAR EXPERIMENTAL CORP. |
| To: | |
| Shared Package | |
| ML20083L048 | List:
|
| References | |
| FOIA-91-17 PROC-911002, NUDOCS 9110020290 | |
| Download: ML20085C500 (3) | |
Text
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.- RF. ACTOR CONTA11 MENT VISSEL X 'Ce'h M
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lD 4-ITOCEDURE F0k CONDUCTING 24 Il0UR 1.EAK RATE TEST ,
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SPEM FICATION
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" Leak rate test after internal pressure has been reduced to.30 pois.w. Leaks. ore me to be corrected so that a leakage rate not to exceed o.27, of the gontataed*voyans.im44g,.
hours at design pressers, is useintained when compenssilone are made for changes"in
- L ompe r a t u re . ' f. . . $. ,.y 9, y IH rRODUCTION The fif ty feet diameter by one hundred and nine feet and six inches containment vessel to be tested has a contained volume of anproxis.ately one hundred and ninety thousand two hundred (190,200) cubic feet' . It is not sheltered f rom the weather and thus is subjected to vide temperature variations during any . twenty .four hour y,ged,j,. g . ,
$1'nc'e' approximately otsa-half of the containment vessel is M1od ground l1Nel","si)M 'M pair of funs will be used to keep the air circulating and.thus at -s constant temperature }
- t hrougho ut the interior.
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Due to 'the temperature? variations the pressure within the vessel will vary duriang .
t he test period . During the midnight to si.x AH period the temperature is st .its lowest .
cnd also is most constant. ,.
e q ,7 4p p.c .- + o Due to the low allowable loss of volums it will be necessary to know the tempers-ture within an accuracy of o.1 degrees farenheit and the pressure within 8.01 pop x INSTRtMENTAT10N~
For cata measurement the following instruments will be used. , ,; .
A. TEMPERATURE MEASUREMEhT ,
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- 1. Three Wickel Resistance Thermometer Bulbs will be suspended in the center of the ,,
vessel. One at the elevation of the bottom of the dome , the second bulb at ground level elevation and tbc third at the elevation of the top of the bowl.
The resistance will be measured to an accuracy of 0.1 oluna with a Wheatstone bridge and galvanctoter. Readir.g resistance to the nearest 0.1 ohms can be inI terpreted to 0.08 degrees f arenheit.
An ASTH thersemeter readable to 0.1 degrees farenheit 'wil1}% ;ba suspended
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the vessel so that it can be read through the window in 'the personnel access 'i th door. This thermometer will be used as a check only and mot for the temperature ,
readings for computation purposes. ,,
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B. PRESSURE MEASUREMENT a e ?- r . !-
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- 1. An open and mercury manometer will be used for. obtaining 'egag'3Iir s[uIwWYtw Mi dif ferential height will be recorded with an"aiccuracy of 0.02,' inch." 6 # ' f 'M # 3
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, 2. An aneroid barometer will be used for obtaimi -atmospher c.p,r.k ressure u mn s q ,(.4ppc
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The sure of tie barometer reading and corrected manometer reading will be tha absolute pressure to be used in the calculationa,' $My jfA ^ l C, AIR SUPPLY ' M N W '* M k M N Y ' [ . -
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- 1. The vessel will be pressurised with air' froen~a tofary' compre'esor~ ^ pas' sed through a filter and af tercooler.+ 7hus p*be vrea'sured vessel fwiltfeesh' dry,oLI. free air. %,%, f j* ,1 .s ag .
s <y* :;9p TEST PROCEDULE .
The leak rate test will be started during the pre-dawn hours with a pressura of 26 peig. This is to allow f or a temperature rise during the day which will increase the pressurt to approximately 32 psig. Thus, the average prcs.sure dt. ring a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> priod will be approxintely 30 peig. ,
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All sucessary temperature and pressurs $dats .willbe recorded et eack interval between midnight and sta AM and each bour Materval fork t be balanca;balf; inf^ . ,@frg J j) hour period. Any adverse conditions which s>ay cause the discontinuance or delay of the test may necessitate running the test for rmore than one 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.pericd. < '
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For computations the perfect gas law w = g will be used. libera -w = weight ef air , .
, RT -
= FM 4h P = absolute pressure, V = volume, R = constant. and T = absolute temperatura.
script "i" to denote init ial test condit ions and "1,2,3 . . . .I" to denote subs. e
'quent Going.aub,g test conditions then, vg = Pi Vi - and, w = AV3y , .
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l The loss can be stated as wi = w - w, and since the volume of the vessel will be cleost_ equal at the beginning and end o the test t he n , ,
Vi = Vx. 7 Thus, wt = wg - wx"hf.i-P,5)do, Tx, J
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i The volume loss (V1 ) can be expressed in termt. of standard temperature and pressure as Vi = % RTs . ' Also, Vi can be expresped in terms of standard pressure and temperature as Ps , 3 p 2 ;.g n,g ? N 4 gp ,- g yVi=PsVs/Ti)q. Thus, substituting we set Vg +=Ne'TiV g, wQ twith .Vg da tenus;m!;
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,71 ' Ti .f$s4.QrpW A9' standard pressure and temperature. - ~
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y .L wg;y.4 a y e A representative of PIttsburgh Testing LatMratories wi'11 witnesofall Yaddlass"afk the instruments used in the test. * '
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The contairsent vess:1 leakage rate detemined by test vhen the vessel
.' nternal structures vere not in place was 0.0k% in 2h hours at design 1.ressure of 30 psig. Vnen probable instrument,and measurement errors are considered, the les'. age rate might possibly reach 0.133% based on 190,200 ft3 free volume. At l the time of the test, the piping and electrical Ienetrations vere capped. Since i
the piping penetrations vere already velded in place, these penetrations should not increase the leakage rate. However, each of the electrical penetrations are tested to give less than 0 5 cubic feet of standard air leakage in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
This leakage for 175 penetrations added to the possible leakage gives a possible leakage rate cf 0.11@ in 2h hours at design pressure based on 190,200 fts free volume. Considering that the free colume of the vessel with the internal otructure and equipment in place de 1h1,500 ft3 as campared to 190,200 ft3 durinc the initial tests the possible leakage rate is 0.197% in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at design p* essure. Thus the leakage rate of the vessel is taken as 0.20% in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at design pressure of 30 pois.
Since the leakage of 0.201 vould correspond to a very small hole and thus
- the length to diameter ratio of the hole vould be large, the pressure drop across the leak is primarily a frictional loch. Therefore, it can be assumed that the o leakage rate is proportional to the pressure drop across the leak.
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