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Ta sk No. 87 Date Complete 9'[2e /'79 '
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: s", summ Or cac11warr ESPG33 i-?.9 TO LOSS OF ALL CONTAD00tf -.
COOLLTe VITH ALL DECAI EAT. RI.TETED TO COMATMENT-
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INDUSULI!U, ADVISTI EGTP
April 20, 1979
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A simulation has been conpleted of the M-2 coc+aimant pressure response
to loss of all contaiment cooling with the reactor in a configuration
whsrein all decay heat is rejected. to the contaimant (either a feed and
bleed mode or loss of all core cooling)..
The THI-2 cont *1mant van modeled using para =eters taken frc::. the FSAR, a
10 Btu /ft 2.
br F on the outside of the contaimant, 600F outside air,
and the Uchida correlation for condensing heat transfer to the liner plate.
Two cases were run. The first, shown in Figure 1, assumed initiation of
the transient on May 7,1%9. As can be seen, design ;ressure is achieved
in about 13 days. The second case, shown in Figure 2, assuned initation
of the transient on June 1,1979. In this case, contaiment pressureil" reaches a value of only 40 psig after 25 days. A hand calculation extra-
polation of this transient results in an asy= ptotic pressure below the -
54 p ig design value, wherein decay heat generation equals heat transfer
frc= the outside of the contaimant by convention.,
Previous calculations done in the IAG fo2 M-2 show that only one operating
air cooler ot.t of five available vill maintain the contaiment at less
than 50% of deaign pressure asymptotically.
Since an emargvincy containment vent system designed to vent at high flow
frcxa high pressure would require at least until June 1,1979 to install,
a:xi the containment can acco= sedate ainost any contingency after that
time without such a system, even if all cooling were lost (rmlikely given
L) the installed redundancy in this plant-5 coolers / fans, 4 cooling water-
165 268^
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trains, azzi limitless doisels), the author rec.a::neds that no action be
instituted to install such a system. The installation would interfere
with work efforts of greater importance and bleed off needed ranpower and.-
resources for little or no benefit..
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