ML20004E173
| ML20004E173 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/15/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8106110298 | |
| Download: ML20004E173 (16) | |
Text
.
TENNESSEE VALLEY AUTHCR!TY CH ATTANCCG A. TENNESSEE 3740' 400 Chestnut Street Tower II f.
,e
\\\\',
qN May 15, 1981 (g
,0l A
'+3 lg Director of Nuclear Reactor Regulation
's Attention:
Mr. R. L. Tedesco, Assistant Director C
/j<,
ar of Licensing Division of Licensing
-4. l.;,*'_
U.S. Nuclear Regulatory commission Washington, DC 20555
Dear Mr. Tedesco:
In the Matter of the Application of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 Enclosed are responses to your concerns expressed to my staff in a telephone conversation on May 12, 1981. These concerns relate to tha survivability of the hydrogen recombiners and the containment temperature profile during a postulated hydrogen burn at Sequoyah Nuclear Plant.
If you have any questions, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY 1.
L. M. Mills, Manager Nuclear Regulation and Safety Sworn to nd subscribed before me this [j - day of h 1981 f
Notary Public
~'
My Commission Expires Enclosure
(
\\
L TH!S DOCUMENT CONTA41S POOR QUAUTY PAGES P
. sm m, sm.
i i
ENCLOSURE SEQUOYAH NUCLEAR PLANT RESPONSE TO QUESTIONS ON HYROGEN RECOMBINERS AND TEMPERATURE PROFILES O
e
HYDROGEN RECOMBINER SURVIVABILITY TVA believes that the Sequoyah electric hydrogen recombiners will survive during a degraded core scenario and be functional to mitigate long-term hydrogen production from radiolysis and corrosion. Westinghouse has extensively tested the recombiners for conditions inside containment following the postulated design basis loss-of-coolant accident and has documented the results in'the proprietary report " Electric Hydrogen Recombiner for Water Reactor Containments" (WCAP 7709-L) and in supplement 5 to that report " Electric Hydrogen Recombiner Special Tests."
These data include steady-state testing at hydrogen concentrations as high as 6.2 percent which yielded a maximum heater rod temperature less than 1300 degrees F.
In addition, over-termperature tests were performed that showed long recombiner operating life (21 days) at 1750 degrees F.
We conclude that continuous. throughput operation of the electric recombiner up to a hydrogen concentrat' ion of 6-8 percent would be accep table. At these hydrogen concentrations and above, any mixture present at the recombiners would be ignited by the Interim Distributed Ignition System in the upper compartment or by the recombiners themselves. The resulting flame would propagate through such a mixture and reduce the overall upper compartment hydrogen concentration back below the 6 percent level where the recombiners have been shown operable for continuous throughput, i
e e
,w-
,-g v,-,n--,
SEQUOYAH CONTAINMENT TE!OERATURE PROFILES Figures 1 through 5 provide the temperature response for the major Sequoych containment compartments as calculated with an updated version of the CLASIX code. The figures show five low compartment burns which range in the peak temperature from 890 to 985 derrees F.
This is compared with the peak of 2200 degrees F previou..'y reported based on the original CLASIX analyses. Thirty-nine burns occurred in the ice condenser upper plenum with a peak temperature of 1190 degrees F.
Burns did not occur in the ice condenser, dead-ended compartments, or the upper compartment. Approximately 100 more pounds of hydrogen were burned in this analysis than were burned in our original base case reported last year. Figure 6 is a composite segment plotted by hand from the tabular output associated with the complete transients shown in figures 1 and 3 Similarly, figures 7-11 are single burn segments from figure 1, while figure 12 shows the first two burns from figure 3 These supplemental figures show the brief duration of the temperature spikes in better resolution than in the complete figures 1-5.
The modifications to CLAS'X that produce these more realistic results include:
1.
An additional node for the ice condenser upper plenum, 2.
heat sinks, 3
radiative heat transfer, and 4.
a fan flow head curve.
The analysis assumed burning would initiate when the hydrogen concentration in a a. ode reached 8 percent coupled with a burn completion of 85 percent. The reduced ice mass permitted by the new technial specification was also included.
l l
l l
1
9 4
6 9
4 0
0 0
0 0
v 0
0 C
k k
4 b
Q 3
c.
4 b
t
- J a]
E
[j 6
n Q
l c,
1, J
0 t
r ra
.,s g
m...- - - a 9
+
4 g pe
[}
+-
.? 9 k
1 b.
(
o y
l t/
4,(
a I{' N
- a i
s b
i y
g
)
f r
R 4
L ti i
0 h
l s
q u
o H
m
'h O
3 3
0 E
3 0
3 E
3 a
n
,o m-9 l
l l
O l
e v-1 e
w~ * -
-y y-m-
-->-g--,y
-et m
+-e,,
y--
JP e
O e
O M
em o
o o
g O
C O
g k
k M
N k
e,
_* *[ - -
(
M jo f
5M'. ~=8 U
=
9 f;--
l '.d 5
^'
c h.M y
L
- ~_ i72 5
g r
D r' "
b' (f
\\
i) d
\\
?g e,
H t.o t,hi o
i gg y og 4
r, b8 g-y g.
o i,
. Q b
o r
.E, Q
b' l
{.l h
I s.
i 1
e p:
l L
e ilu g
g r
F
- l 3
0 l
l t..l
.4 3
dl G L'Ut% E431 r.
l
~
9 A
e 1
e 6
4 4
l "h.
O e
0 0
0 g
o M
f e,
h I
l l
Y?
f.
4 n
. ~....
p'
-...u."*~W*
9 e
3
- - : ;t u.;;.~.. -~... 7, *. *.I1.*.** # **'.*Jr Z+.3Ei E _.E 5._. ; = ET=E=~3-m ;= ~ *~r-*.
q K.{s TU Ga^ E5GG ~..k WMi..:s. sk,, a:,:..,. ' ' =
Q 9
h
.a,.,ww.~..., _.
rr - -- -.. -,...,
n
',.]
.c-----
=... _ -
a-MWMM A9
-- -+
.m w.4-MI'7 W-
> q
,J t
1(
- - -..__._.=r-~-4..*--~
_.A-~"
h
_.----d*
{
N
_._=n=_m. wee
_-s:
r-1-2 s -
~<
i y
A 2 {,
14, N e.
u r
.6i
\\
u Lg G,
e D
i U
l l c
lI I
3 ei, 4
b d
0 3'
0
[,
2
.n e nu m at e
S e
6
+
.,,.---,a
--,,p.
D o
0 0
0 0
g o.
o 4
o O
0 o'
o O
m i
4 4
h N
s 3
~
N m
L, 9
b
.==.: z e,
=-
y
+
E=
L e.
B U
=: w-
=...n r.
F.. =......
.r t
ti w, n, __ _
t
-- m g g -
- j.
I
f;~; =;[?.. -dj q
l t,
g
%)
\\
8-tt
- 0W!!
n t
E0 l] E!)
~
u F.
c' rA la it r
(
i c>
[,
B
[ -
4
.C..
i B
B B
B B
B
.B a
a 9-a l
m emmm l
r i
l l.
u,
, s '.
x:
,;,s.,-,
e 9
d O
d Q
o s
o Q
0 3
u-N th 0
0 0
4 Q
4 s
u
- 'A E
@b e
i Il' e)
I I
h' 9
c 1
v l
ti
~._.__=_=(
u S
7 b
1 s
l L
o n>
e I.
b N' N {h?y
..e 1 e
p
. -Qk s,
41 g
e m
Q k'l S
l t,
l l I
.b,i f
O IJ t
N I
p
~
n y
v 4
('.
v.
[ l){
- %s sp.
1
_ - -,,, - -, - - - -. - -,.+.--
.. a sM
/
/
s s
~_____l
/
-- 9 8
l
.tt i
.h1 M'
o V
I
..g w
u
/
Mb
/
U
/
- J s
u A.: -
~ _
g
.. n d) 4 i
G I
S I
u 7
.R m
I
/
w
.I
/
/!
t/)
/
h O
J
'A
' ~ ~ _ '}
C w
3 a
^
~
I
~-
_J 0'
0
- ^
u c
. G d
[
v) g I-"
W i ~
Li
/
r-h O.
5 t
,/
.o i
k-j
?.
tl f
-- - M
' ' " ' " ' ~ ~ ' ' ' "
j g v 6
b l
k
,- 2
<r.
y 0
uj Y
a x
k r CL ho
~
s d3 u
5
/..
.2 o
.p
/
(A
'V 8
? h2
~ =. = = = ~ = ~ " ~ ~ ~ ~ ~ ~ ~
- J g g
~~~
3
'E $ v l
i i
!]
I 2
I
~
n
.I g
I
'6 I
r o
+
i o
.i a
O D
9 9
. k.. '..
@Q. _ _
8 k
C 0
o
- 5.... N.. d _.
_ w.
..% __ _h.._ k k.Q
c3.
....g'T
,. 4 ! {...,.4....s
. -,. +,
.6 1
4.l4,.. 6 9......e. -.. g }... g.
..p. g.g
,-.e..,.; 6.F.1'.I.l L.L f. 4.,t-.s..e
.., _ _ i. L _
!.,4
..t 1..
.f..
.4 t
.},..
..l.,..
A l.,..,. - #
.e.
4 4 4..
g
- 9. 9-l.;
.;...! e i.. l. &... i.. L. F ; i 4 %.6 a...
.. i. !
J... 4.5. i '.
3-
.. t.4,
..,,.. i.... 8.... ' L a.!
6...
b.1.t
-i..,..6 e -..,.
6 s.
.-.4..
-....s...4.....,..-
... u. 4
.n p...
m.
4
...a.
..... ! -e S..
4.a..&.,
.4......'.' ' L.L.&.a 4.
6
~..
...gl
.. '.l. - 5..
.........s 4..,--.L.....
.M...
6...
..p..........&.,...
.g......,........
...-...4.w.
...m.-..
..v...
-..s.g 4
s J
..;.1*..kLi l
' 4.I.W
~.
.,,...i....J,.........*
....v._
..... ~ ~...
-..s
.... ~..
.. _ ~
....n
+ -
....... ~... n
..t..
L.
.....n.,e._[
........... -. ~.... ' -.. -...... _....
....~o.
..__L_-
d_
..s
.._.~..
_ :p -_
..... -...... _. ~,....
./-..
. g. _
..L-
... ~.....
........n 4..
y
........ y.
~... -. -..
. g.......
2_
.-p..
... _ _.... CQ..... _.
g%_
-,.. ~....
m.
...3
...___....).....N... -. -
=
e 4
3.E.. y n.
i a
..--...._....-N...-.
n.
...C..
a g... E.
4
........ O.......
...... - _ H.i. _
4.,. 9 3
,w w-.....
ap
....g.....
..._. _ _ _... %a y..
.__.-...2........._....-
t r
.q.
...--4.'
O
...u p
p........
g
%J.
p
, w,.
....N_.._..._...
-L-O s
. Q....
9
..g.
6
. --~....... -.s. -.
g.
....~.. _
n.
=
.........6..
....L..
....s..
._c
...r 6
._.g..
-. ~....
... _ ~.
.. ~.
k__
..~...
e
._c
(
.g e:. _..... -...
._. c.
01
..... _... G i
L_.
1...
/.. -.. -..
...._..J...-.._._'..;.....:._
.__. es to _
p.
L.
. ~
L.
... -.... t,.
.w..._
.y..
3
.. i _
3._.
.....,r....
-i
.......__.l.,_.-..-
m, r
7
..g.
7.....
- - * ~ *
- 4~***"
. ~..7* 7
...'.'.a...".-*..
9
- 9,_'..,
Y **
=,. - -
6*
i
..__.p,
.a
. j....,..
- ,... 3...
.o......
.... -. p.,
..t
- g. C. W_.1,,..
/
~;.....
.~
..._.......e..
.~%
go 7.y e.
,.,. 7..,.i.r m
- 4 I
lll
,4%
$ll/Q /
_ Rhkll//R///
KY
\\\\\\\\
. IMAGE EVALUATION NNN
' TEST TARGET (MT-3) l.0 s'EnIE
" d l141 s
1.1 '\\,[,'" E
+
/
.8 p
ll 1.4 1.6 illl.25 i
=
./
6~
=
x-
,/y,;44 4
4f,,,,,xfff
<t ;.f Ax y
4 b-
~
)
\\\\\\\\\\[ kf//'
g(g /
\\\\\\\\
l MAGE EVALUATION
\\\\\\\\
TEST TARGET (MT-3)
I' " i.0 5InIE y $ 144 r
I.I SJ 'S EE
,/ ~
g_g i.24 jg pg
/l 6"
$+f[#'#k,,
4% 4%
z,p%Q[N a
-i g
-N
..h%
kv-l MAGE EVALUATION N
TEST ' TARGET (MT-3) l.0 5in L24 g m g2g ma l-l ' S 5 M l M 2
1 l,&
1.25 1.4 1.6 A
4 %g,,
jf 44%
b////
'43;Q,;[4 49,7j4p a
r-
__L_-__-__--___.
,)
l
e
... 6
..,r....
6_ i.,
6,
. 6
.g 3. 6
.p p
, 6
.A
- .,.6
- 4...
4...... - 6. f...
4
- 9.. p....
....&.. e 4.
..e a
- 5. s 4.
..i
.. L 4.
s
. i.
4...
I r
-..-'*.s.
- * - * - * * * - * * * * - * **... J
.L 6..
- 4
+* * * * * *
...3...
- = * * * * * * * * * = -
....{.....
.... a....
/...'
.6..
.e
..m.
...m
.. 4.....
.O..._.....
- 14..._
m.
g
.... g...
. Q.....
to.....................
......._.....M._...
...m.
n__.
........ O
. _. -. %... Q..--......
.d
. p_..........._.
x
..... o.
.......... x p
g..._.-
...........Q...g
..g-g
....g._
......d to v.......
--=
LJ V.-.
C
.g....
..- ~.
.l..
.O N
4
.g
.~.-..
d O
_q
{.g u.
...3.....
x 4..
g
..g._.
.. _ =
._ _.... ~.
... q
-g f.
_.... -. p.g.
s.
n..
e.
. ~...
., _ - _... ~.......
....a.._........
y..
T
_'.i~__. _
--.._.h..._.
.. ~. _.
._4 o
...-.,m,.e
~..
.....4-
==
.... _ }..
...e-......
._g...._..
...a...-_
o.
.. -.. ~
.t'
... h,,
........4...
l
...y.._..
..-q_
4.
.. ~......
W..
...y..--..
~
...i m.
4.
-.. g
.. s;.....
,g c
to N
3 1u.
l 3
O'... O s... g q
g g.
g c
..,2-
_o e
2
.o
- 4..
4
. n.
. 4
... _ -............_t....._...
-......a.
4 3 uD !.#4L?dvol..
t !.
. _r.... r. ;.,.
... _2_,.. H.. _., _.-.. _.....- _...
- r.. -:
. -..u.,.
5 w
. 4.,.
.y
..... g.1. -
- ,tg....,,,,-.
6.......
-... 7. e..,....
4 o,.
.f.. 7 t.9 4.
t* " * - *--* *- P * *-* ". - ? - -+ -
p,.;.
...w...
--+-+-*-~~-*---*-P;
...,,. l
_p..
.. o.
t..
.I...,..s-.. ~...
.s p.
C.-.-
....s......._
~
.e-..
. -. ~
....:...L 4....:L.24
.. 4 4 4 7.,
- .. l.
- L.s y
. L.) m
-J
.l.L
.+.. _.....
.. -. ~.
. g _..
..... ~..
..a.........a--
=x g
.. -.. > =...
~
.W
...p.. Q%.;
n N....
q c,. C( --.__
o-__
g.
.q
)..
ps.s.= -
y.
g-U
........ 3 __ E..
l m
1... %./..
i i._
.. M""=
t
-4 y).
..."..g
.b
=
Cg -....,
.a
_ q_
p
,H..
e.
4.
ah J
l W
t 1
p fg Q.-.
5 1 j3 - - -
^ _,,
4.. - - - -
0 (d.
I
.e
- {
_.g_
i
.n...
-........ ~
.8
,0
.b
.... W
.s.
- r
............... ~...... -.
-.. _....-1....--n.
E o
g. b..
,q -
.._ y...
.......j.
j
,...e...
l...
--_2
.O
..7..
,,p
...._.........L.L....,...-.......---
.M
_.4-..,
i
.;,.i s..
...o,
.~6.,-..-
..A..... - _..o..-.
. s 74
.e
- 1*..
~
O
.,.,.c..
p..
...,..a._.
.u...
.t L... -
g_
a i
t g,
i.,,,,,
- s. - _.. _...
4
.I.. *._.
v
. }.....y...I
~
-r.
.o. _.a ag.
g E
7....
... g...,, g
.. _... p.- - 3._... g...
.... 3 _
q;
..... p t
s,....
-... ~...
-.i.
s..... -....
n._.._..
4.
-..~
- , ~ *
.,.k..L...--
. 3 e.. yyn m%..r. n + ~ -.~ -r r. ~~ r - *
- r-
.a e.......
e p.
.t 6....
a.....
e
. o,.....
s,.
..y.
....y-.
.p.&...
p....
,_..p..
.4..._.......
........1.
....a.
4...
. w.
.t...
...m
.g..
. f..s.)..
.*.a...
.s....-.
. a..........-
a.
...._ =_..
Q 3....
.p
,_ W
... w.,,
. b=..
/"N. _........
..o..
.A.._._._
.U
. s CO.
~
p.,,._
.._ y.. - - -
. s
".2
... c, of_.-
M
..g.
o 4,,,
T M.
y y.
_... n
- o...
_.3'. g...
s,,,f....___._.
. o 9
._A
_4 w
m
_. g.
.C -.
f.* 9
- r..
a s:
_.C g'"
g
..e-.._... _
n_
.)'.
O_
.M__
.T
..._....v-
.....u
.p m.,..
g,3 _..
9
.g
_.....-......a.
..0.-
ce.
g..
.. ~ _ _.
.........j.............
-....-. n j.p....
,tu.....
o.
m y....._-.._.....
p.
..-.~.. - __... _..
. g..
g..
.. ~ _....
_.L t
r
.... J.....
.g i
e.s
.M..
a.
t.a..... -......
(
n l
p.
r i
s g
[
_..... 3 o
-. 4.....
........O..
m y
o.
....!..;.....,,.....qp.
..... p....,........,.... 4.,........_.
-..x,_.
t
.fwyeya p. i
....... -. ~..
p
.1 i. - - -.. -
. +....,..
.... i..
+,. 4.1...,. -.s
.. a.
....a........
...L,.
.. ;... - j. 6 L. 5.J. 4. 4.....
.a p..a...,..;... H....,.
..... +..........
. L.
_. 4.. '..!.L 4 H.,.J. 4_;. L..t ; ;_4,.i.i.:.
.;L..
o 1.. :. L...
L.
. 4.:
s.,.;.
. d _....
................&..L6.-..
-U...
.._t_
...,.. e...._....
....4..__..
.....p._...
- 4...
w
=.....
._ o,
~ _. _.. _....
=-.. _...... _...
p 7,N.'----'~'._',._.-..-'.'-.**~.._**.*-~~~-*
,u e
a.
..-..u
."2...
. o CL...
. o
_..)
3... *A
. _...... _ e. __ r. _...
o e
- ... L.
.______.3.g_.....-.
g.
.. v. _..
W.
g
_o, V...
N
=
~.
, _ o%,
g._._......_.-.__....
4..
'...L 9.
g_-
s
%d
~
.O.
W
+
o g
.l g
W m__
.. +
.g..
l-
_D l
..9..
.}
u...._....-
}.
_C
. ' - 4 u_
....... ~.....
-e p
=
i_
__l
..._l._.-..,
. =.....
-.p.
4
,1.s.
. g
........w..
Lo
~. tD _..
..... ~
r4 e
.. M,....
o
. a
._g
.._..y_...
..u.
.A 5..
. j n.,._..._
.a'....
--- +- -
- r
.m_
r
......,..i i
4 1
i,.. g..,. q..
Q.
..C*
'9.*
. Q*~~'7*"***-"Q.*-*~~.*.#*........ '. '. '.
Q-
,_. w..?.r
- O -
- ~*
....a.
6...
c.,....6....._.
o.
w
.... v
.. N
" i. ;.......
..?_......
....r...._4 r
- ..e..,.
.. a. _
.-e..
6
........j-......
.,.,.,/ a
.a.'m.2 we A. v,d, w 4 4.-.,....
.. _.i h
O
...p M
_b
.p-6+
4 f..
4.% $.
'6
O
.3 W
~
R 3
4
-. e l
.c O
N o-ct
~'3 ND 1
0e W
Q "Z
0 1
b rN c
c3 o
I F
4 w
k b
1l1 I
o-7, s)
I O
I U
o n
5 C.
3 e e u
w.
it H
D 0
^
f 3
o 3
g v
=
o>
44 M
I I
^
I l
(
1 l
3 o
c.
?
1 2
3 8
a i
3 g
d e - 3 e.01V >J ~Ll'/i *.LL
-w- - -,i-, - - -
w-.
,y-,
--,,,.y -
,a
--ww.
-, -. - -. - - - -