ML19290A244
| ML19290A244 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | Schwarz H BROOKHAVEN NATIONAL LABORATORY |
| To: | Budnitz R NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML19290A225 | List: |
| References | |
| NUDOCS 7910240222 | |
| Download: ML19290A244 (4) | |
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BROOKHA'4N NATIONAL LABORATORY T., i s lal L -
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I ASSOCIATED UNIVERSITIES, !NC.
Ltsfert Nw Ycn: 11973 a et er Crema.
s (516) 345 4330
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Apri-2/, 1975
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Lt. R c':47: J. Sud.itz offire of Nu: lear Regula: cry Resear:h Nu:2 ea t Eer23atery Cc=:1ssicn
- 'a s '.. i. ;.' r., D. C.
20~55 De a r 1:'r :
I an en: losing the su :.ary of our teleph:ne cer. versa:izns and f urther thrugh:s en the accider.:
whi-h yet requested.
Sincerely, o
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.J :. 5
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Har Id A. Sch ar:
I r.: e s u r +
HA5:bu 2226 187 7 91024 0 L t '
, el. : '
d Ladiatics Che=istry of the tree Itile tiver A=eide=
3 De bubble for=4d duri=g the sc:ident cen:aised 10C0 f t of hydrogen e
1000. psi at around 400 7.
This gas was above (sed assumed to be nearly at 3
in equilibrium with) 10000 it of cooling water a nearly neutral pH.
shout h of which was in the resetor.
De water was being irradi.ated by De dissolved fission products and by T-rays from inside the fuel rods.
question was whether or not hydrogen end/or oxygen would continue to be for:ed by va:er radiolysis.
Nearly all the radiation was absorbed in the uster phase, c==sequen:1y ne concen:ra-vas only necessary to censider the cooling water itself.
1:
tion of hyd:: gen in the cooling wat er was cheu: 0.0I.6 neles per li:er, b= sed on the pressure over the :olution.
In additien, the water night c==:2in a concent ration as high as 0.1 ppm cnd several ffssi:n pr= duct fodine at other fission preducts at ec= parable concentration.
Par: ef the Zircenium wh h is essen:1211y inse1=ble is water at cladding was oxidi:ed to I C2 Terrie end f erreus iron could conceivably be prese:st f===
neutral ;E.
reae: ten with the core vessel, bu: f errie sclubility is rather 11=f ted, probably shout 1 pp=, e.nd anyuay there chould hsve been cm =cre tres It was asse=ed than is the re during nor=al opera:ing c=nditio=2.
present tha: there was no cepper present, other th.in fission product a=ounts.
C.:nsequently it vould appear that the total concentrs:1=u of dissolved spe:ies which were very reactive towards the free rad 1=els prnduced in water radiolysis was abou: 1 pps, certainly no ::re thm= 10 ppm.
irater rad 1=1ysis by fission produ::s p;=du:es =oidar hydr =?,en and hyd:: gen per==ide in c=all quan:ities and larger ar ts of the hydreryl radical, OH, and reducing radicals.
C=nsider first the =clecular hydrogen and the hydroxyl radical.
ney are for=ed is yields of 0.4 a=d 2.8 =elecules per 100 ev, respectively.
De hyd :xyl radical reacts wi:h hydrogen E+EO 03 + H
~
2 2
and this is the only reae:1== vhich seeds c:ssidera:f=u is deter dM t If 1/7 cr==== of the whether or =ot u.are hydr = gen vill be produced.
q m this way, then no =cre hydre:en vill be produced.
03 radi:als rese:
2226 188
2 The ra:e coefficient for this reaction is qa m
.q.
-1620 '
.A e.=p [(
a o
_a 9
9.2 x 10 E =
T j
s 8
-1
-1 e
o or 3.0 x 10 M see at 200 C (400 7).
The mart =.= possible race constant (diffusion-11=f t ed) for any CH reactics veuld be about 3 x 10 at this ta=pera:ure.
The rate of the reac:ica is the product of the rate coe f ficient and the concen::ations of the reacta=es [k z C(0*d) x C(H' 2 so the f: action of CH radicals r=ac:Ing with hydrogen is at lems: 5 3 10 x 0.0/.6 8 20 3 x 10 x 0.046 + 3 x 10 C vhere C is the concentration in celes per liter of reactents vedth cs=1=.::= possible rate constan:s. his fractics is greater then 1/7 if C is less than 2.5 x 10 M. Tor an ::o=ic veigh: of 100, this vould be 280 pp= ~ Vi:h less than 10 pp= of reactive i=puri:y present, essentially c.2.1 of the hyd::=y; radicals reacted wi:h hydrogen to produce water c=d kydroge= Thus all radicals produ:ed by radiolysis vill cod up es r==:!uci=g ato=s. radicals, and whe:her they are all hydrogen ate =s or half of the:= cre hydrated ele::rens (as ini:ially produced) is i==aterial. Both reset with cxygen a: diffusion-li=ited ra:es. C=ygen could be produced by d=co=posi-
- 1es of the hydrogen peroxide vi:h a yield of thou: 0.3 colecules per 100 cv and a steady s:a:a cenes=:ratice is dete:=ined by reactic= with H at==s.
The etal radical yield is 6 radicals per 100 e-r. 7 cur tydrogen at =s a:e required :o reduce one o=ygen =clecule to va:er, so the staady s:a:e cf 0 vill be reached vhen 20 of the 3 st==s (or electress) rese: 2 vi h 0. != purities v..ich vould ce=pete vi:h the oxyges are ferrie ions, 2 and any o=idi:ed fissica products. As before, the su= of their co=cen::a-
- 1cas was a: =os: a few parts per =1111on in the reactor, so the s:cady-s:2:e of 0 should have been about 1 pp= or less.
This was abeuc 10 of 2 thz bydroger. presen; is :he vater and since the distributions of 02 and '* be:veen solu:1cm sad gzs are nearly the aa=e, there chould hc-re bees las= than ene part is 30 of 0 in the hydroge= gas a: steady-s:ste. 2 If signiIica=: 0 vas presen: i=1:1.2117 it :hould have been reduced 7 to va:er vi:h a yield of cue =clecule disappeari=g for every four radica.ls 2226 189
4, 3 100 ev. 24 sed on a p; educed, or with a yield of -1.5 nele:ules per 1 (which see=s dose rate of 6 x 10' rads /heur giies,for Sunday. April 3 'at 1000 pai, Pc; h,ur, or 0.5 ft o 1.5 pounds of o2 very lev to ea) shout steady-state level was reached. would disappear, until the In the cheve analysis which has the benefit of checking same frc= thace given you literature ref erences, one figure is dif f erent 3% the - d-"- reacti n pr coeds at ever the phene, uc= sly that the OH + H 2 I did not rese=ber the 400*F, not 101 as stated. the::etical rate at Oc th'e other h nd, a safet; value for the a:tiva:1cn energy. ene or tve hundred parts cor:e:: ensver, tha: fact er or 10 was included, co thei= purities vould be 700,uired to prevent t per =f111== of cridizatie back reaction was the cane. is setually dissolved in tha The ab=ve caalysis is based en what he surf ace of a sclid the radicals could pessibly diffuse to tand se the hydreryl rad vat er, but of the sclid is :ro The hydrogen st==s could dif fuse up to 0.01 c= y E=st and rea::. find nothing =c react with. this distsace to in their lif etime (though i= purities probably li=it expect se=c reduction of Zr02, perhaps to a shou: 30 c=). One =i ght ~ ld slowly disappear. in which =ase hydroger. cou ly (01C%) hydride of s=== sort,of the parameters used in this analysis are securate E=trapolation is required for 200 C, Most knove. in the region of 0 C to 200*C. h f actor of two. should invo ve lit tle error, certainly ne verse t an a doubtful part. but i= purity levels is the = cst L4ek of kacvledge about J e a 2226 190 l .}}