ML19221A162

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Summary Paper Re B&W Results for Size & Composition of Bubble in Reactor Vessel,In Response to NRC 790402 Request
ML19221A162
Person / Time
Site: Crane 
Issue date: 04/02/1979
From: Roy D
BABCOCK & WILCOX CO.
To: Mattson R
Office of Nuclear Reactor Regulation
References
NUDOCS 7905190223
Download: ML19221A162 (5)
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Text

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R. K;T505, NP.C - TMI-2 SITE Frca '8 "88 DH PDY, SPECIAL 0?ERATI&tS ftWriER - 89l Cast. . File no, e or Ref. StLStARY OF Ba'i AMLYSIS 0 SIZE ASD CGP051 TION OF H /02 2 SU33LE AND TMI-2 VESSEL April 2,1979 [ m un,-- r. m s;.e +. I Attached is the strcary paper on BUI results for size e.nd coposition of the bubble existing in the TMI-2 mattor vessel of . This is provided in accordance with your request at 1900 hours on 4/2/79. We will be happy to discuss this further with you and provide any other details which you rey require. Please contact ce at area code 8M/33?-5111 exter.sion 219I. DHP.:ivs 2 httadrent 136 0,3 0 Y00 g. 5y "O % 3 f

v ues o:o v.a. ~ .~e. - SIZE Q. THE GAS BUBBLE IN T E T: I-2 REACT'.R 'di5it. t The size of the gas bubble in the Tit!-2 resctor vesset (including sny cas tra; ped in the hish points of the rcactor cooiant toop) was detemtned by exasuring systen parantecs during ir:p cssure tm:tsient I i TrimM on the reactor c olent syste=. This was accomplished by isolating the res: tor coolant systeg except for its letdc.et ficw and its reactor cooirat yg seal fica and allowing tto pressurizar be_aters to increase the rector coolant syste:2 pressure. Cars +.:as taken for the rea: tor cooiant systea pressure and te._per,ature, the pressurizer level and te perature, and the.:aicup tank level and te.perature at both the start of the test period and at the end of the test period. Using these ceasured para :cters and the ideal gas law, a :.athe.stical correlation was deveio;>ed to calculate the bubble

w. m size. nis correlation covensates for the change in pressurizer Tevel and l-M T -

adjusts for the chtnpa in specific voic-a bete the hat fluid in the pressurizer and tk relatively cold fluid in the re+: tor caciant icop. A sioitar correction ws inclu'ed for the chan_e in specific volume bem the hot reactor ccof act e entering end Icaving the cakeup tank. Ad_iustreats were included for the cc :pressibility of the reactor coolant fluid due to the change in pressure, the c.xpansion of the reactor ccof ant due to the change in terperature, aM fcit.be c.% e in scrubility of the c:s des to the change in pressure during 9 the test period. The attached figure shows the predicted bu%1e size for eight sets of test data analyzed bsth with and withaut the solubf i f ty correctico. These to a.alyses shxid bend the raxicu:s and einirm bubble sire. The figure shows that the bubbie size c;proaches zero at about 1500 hours on April 1 if the solubility of the gas is considered. Vithout the solubility correction i factor the predicted bubble size is significantly larger, 6.:t crf:Ibited a sirsilar .a de: easing tendency which vauld indicate a zero vciu:e by aircst 12:00 Mars to j April 2,1973. The ca:raltude of the error ranges are based on the expected 4 reputchility of the instrtrunts under r,orrai operating conditions. Under the cxtre. e conditions irposed on the instrumntation ir-the p rc s m t en vi ron,en t, i the errc ranges ray be sem43t Isrpr. Ve fe-ei that tM calculatica which ircir4s the effe:ts of the gas sa chiitty is t.d.-ically rare valid and feel r that the conclusion of zero bubble size tends to be corroborated by the sudden f j l30 i) / 't O e

r:.,.. D. A. NItt! a~ AprH -2,1973 - pag, % app-araxe of a high frequency raise in our. pressure readings en ten B-icop pressure transnitter signals at about T5:07 m A.=ri t ist. The appear.uce of this high frequency reise is intepreted as the point eare ar the reactor cost w s once again beca=e irurpressible. l (04 () 7C ,f 30 J,J e e

me..- - CWJ5ITION OF TliE CAS PJ55LE TP# PED Iri TlE F.EACTOR CD3:JaT SYSTEA 0? THE TMI-2 FLOT A review of the postulated sequence of events on March 28 lead us to conclude that there is no signif'itant amunt of oxygen in the bibble that was present in the reactor coolant systea of the Three Mile Island fiuclear Plant. At the tice of the reactor trip, the reactor coolant contained a significant amunt of dissolved Ivdrogen, approxicately 10 to 15 cc per kilogram of coolant.. This a cunt dissolved hydrogen is sufficient to suppress the net production of radiolytic ongen. Ifnen boiling occurred in the core region, hydrogen was stripped frc= the reactor coolant ard scce net radio 7ytic oxygen prodaction probably occurred. The esticated production rata was about 70 standard cubic feet per hour. Shortly after boiling began, a cetal water reaction began and generated large a cunts of hydrogen hn the order of 50,000 star.dard ct6ic feet). Tnis large arount of hydro-gen apparently beca e trap;ad in the rce.ctor coolant system arrd forced a large bubble in the reactor vessel heed. After the catal water reaction was quenched, this hydrogen bubble created a hydrogen overpressure sufficient to dissolve approx-icately 1,000 standard cc's of hydrogen per kilogr2: of water. This a ount of dissolved hydrogen is approxir.ately 50 tices the rount required to suppress a net radiotytic generation of oxygen. A s all c.ount of air dissolved in the coolr.t water irdected into the reactor ccalant systen introdu:ed less than 2Cr] starerd cubic feet of oxygen. Since there were oc other soortes of oxygen, W conclude that the hydrogen bubble never contained an oxygen cc.".antration.of 102!, This..}T 3.. ~ concentration.of'oxygin~isjell below thel 53' concentratid req 0 ire'd to, support ' ${'['..; ~ ~ corbus tic _n in hy'dfogen-c'xy'ssi rilx'tuids.[ ' _.7 '~~ ~ ' "O Inlapendent calculations by Dr. Co.v.e.- at Battis Laboratories support the conclusion that the prtdxtion of radiolytic cryg:n vis suppressed by the high hydrogen ovegressure present in the TMI-2 reactor coolant systca. DAN:daliss

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