ML19221A416
| ML19221A416 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/14/1979 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| OLS-790414, NUDOCS 7905220464 | |
| Download: ML19221A416 (3) | |
Text
"
6 f
1 TMI-2 Fuel Dam s'
Examinations of data frto core thermocouples, inco,re and excore ion cha-ters.
and analyses of core parannters such as primry coolant pressure for the first dozen hours of the transient shows three periods of significant core uncovery.
That is, 3 time periods during which portions of the fuel assemblies were cooled by steam rather than pressurized water which is the norml cooling nie thod.
It was
/during these periods of deficient cooling that extensive damage to the fuel
~
occurred. This damage occurred prirnarily by exidation of the fuel as-sechlies, zirconium alloy cceponents, which were embrittled and lost struc-tural integrity in the affected regions of the core.
Estimates of the and extent of damge were calculated from fission product / hydrogen releases inside the plant and radiochemical analysis of the reactor coolant water.
The region of extensive structural dacuge is probably confined to the upper 40% of the core. These analyses indicated that some of the fuel may have reached temperatures as high as 3500 *F and that rupturing of virtually all the fuel rods occurred.
The melting point of uranium dioxide fuel is 5100
'F, thus it is unlikely that fuel relting occurred.
l')
f 7905ago4gv
....---w
~munw -~~ - -
<-~:,
"-_e m --
),."M.D -* 2 6
j t
4
- 4 ll s
' E P.2nt T* 2, THmiM1
=
C;adensor ccuta re-stdeli-P.2d.
{
D _ 3p,r e"res ccsk. ins ctoc.DInD to cond:n:cr.12at217 IC0
'l 1
A b' ad to cppro
- g. igm lina camd b, par.11t fic1 c :d r21127 v31'!2 L31T3 c ! ( 3Mnated 10-la CP fi d -
s g rc31 i. m e a w a r = a =2 u m, c md<.
s 1
iij s t ; a P # rn 'Jloraest21stenec1at153rzitle'"2-i e
(
4 1,
g p-*
J h
g 2
s b
e g
i 6
e 162 152'
(hk 4
64
\\w}
s' 7'7'.
d,,
a
<s
<3 9t s
~
d
'O y
t
( o, x
- y
,4
\\
o r,
y Du b 4
r-4
{
k 3
y Db I
\\
(%
..a-7 o
%9 Lz U
(,...... -.. -...
g
~
g 4
\\3
-~~%.
27)
L'3 b
r
,...-.--m.',
........ - - - ~ ~ ' '
~
~
{}
~~.e ~ m e * *---.. w ~ m. o n.
_.. /...
a
~
~
g o
o o
u o
Q h
O c;
N R
9 O
3
/
l*
- a t
,