ML19220C922
| ML19220C922 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1979 |
| From: | Buhl A NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | |
| Shared Package | |
| ML19220C920 | List: |
| References | |
| OLP-790404, NUDOCS 7905160065 | |
| Download: ML19220C922 (2) | |
Text
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gji Potential Core Melt Sequence of
- g Events Based on TMI Conditions on April 4,1979 QE w;
t-g4 1.
Best technical judgment--core melt will not occur.
Nf pj 2.
If core melt occurs--cest tecnnical judgment on sequence of events.
@s Time = 0 We
{g
--All reactor core flow stops with system at 2500 psi, 3;e containment cooling starts soon.
s M$
Time = 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />
--Molten core melts through reactor vessel and 7
falls into water in bottcm of containment.
Ab
--Containment pressure goes to 23 psi.
M kl4
--Co not expect sinultaneous hydrogen burning, but if y
occurred, containment pressure ccuid go up to abcat 30 psi.
Time = 3 days
+
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--Molten core pene: rating containment basemat--now about a
3-4 feet into ba:emat.
W w
S.C Time = 1 week
<s 2
--If there had been no contairment cooling at all, predict D
containment failure by steam overpressure.
$m n
Expected Final Condition h
Containment remains intact, core mass reaches thermal equilibrium f.3 af ter penetrating about halfway through the containment basemat,
{S no significant release to environment.
3;
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p Imoortant Notes LC
$g he Ccntainment sprays and heat removal are required to prevent l.
containment failure.
M 2.
Steam explosions and hydrogen explosions may occur but not expected h
to rupture containment.
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