ML20024B569
| ML20024B569 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1978 |
| From: | Dunn B, Nirodh Shah BABCOCK & WILCOX CO. |
| To: | |
| References | |
| TASK-*, TASK-GB GPU-0616, GPU-616, NUDOCS 8307090236 | |
| Download: ML20024B569 (3) | |
Text
q A
S 0
(A>
3b q C7m 8307090236 780404 DR ADOCK 05000289 HOL
e n
---a a
aa
^
~
~~~
~~
..e t...
x BE.ST copy i
4P.U.6/1
./.
sese.neau.stes.rt) 1*:
8A8 COCK & IIII.CCX
(.
?
I PREt.IMI'hiRY REPORT OF 3AFETY CONCERNS d
?V, i
p,.!
- l to: athAS(4. LI:lltsin, itPG8 g siges,igseg espigegeg, tes se, e
(ss: testste as usau s) fees:
- M Shh O seestaatsat soitte sarase # Lt so.
205 TA T4.4 h.y
. sostens es.
2*1 essaattatsee: WR ta'9"**
3 sess. steestaatt site h.
I Mi eset a W attaca see estetser, se east so ou. ass, seeeesties essenatsoepene.gets m
- l ene, see see se eesce e6ast was tot meeste seesses sjte tua sueunt es costesse seuse cesssee T.;
sueriesut f.
On )tarch 30, 1978, while checking the adequacy este a see
- i:
@f
)
of a 6 foot Auxiliary Teodwataar (AFW) level con trol for a generie 205 TA plante, it was found
$.4b that the results of a certain: :email break LOCA 4 se un senuna is us naut Oves S ee do not conform to the requirements of 10 CTE.
q;.
h.
30.46, esse a oes.
3
..v
- d W
ra
.I stuise,une u.ienn unte.u n.a.es uu,,u3 Springs), PASNY (Green CountrD.
p@'
All generic 205 TA plants. CEIO (Erie) T7A (Bellefonte). VFPSS (1,2), PGE (Febble 3.*
s.
el esscesetsee se saettv susses.setetsew aseractge ca eests:(s). susnets) es actsestesseerute. ase smeset es p.,
sarste et etset useatsees Tor a 0.C5 ft2 break at pump Eischarge, the core uncovers by a two phase misture to Q
the extent that the core cond2:1on may not conform to the requirements of the
- h..
10 CTR 53.46.
y A 40 foot AFW 1evel control ibt :the past have resulted in an acceptable result.
[j?:."
~
3 The design change to a 6 foot control does not provide a safe, acceptable result..
g*
u.'
For a safe plant ~ operation, t!he system design needs to be'sodified to avoiit the un.
{
acceptable consequences of a. 6 foot AFV level control.
- p. -
1 V','
i w
L-
~
- c...
r.
r i
i il nacsist sesecanu actise surutusta ses nestutte p
t I
~ Corrective actions, identified! aut not initiated, are described in the Attachment A.
The actions emphasize either a calculational improvement and/or a hardware change.
s b
t P
ni,s...su east y a,.saisu se. un N.H. TkJ Lidl7T 41Wm WW79 l
+
.e s.uies un
... sue ui t
l I
i I O227
@_ _7,8 J _g.
l
_2472]
1 T.,. L l
.,-,---r----
w-
,-..n,
,.n.,a.,
../.-..,
.,, -,s BEST copy
/
1_.:
_<=_. w.
- x.
t s
1 F<
ATTAC100tf A 1.
-3 y.,
s 7.
Described corrective action completed /to be initiated (Continued)
!?.',? '
f;:-
', ^
u..
_3 Corrective itesa are identified, but not limited to the following lists
- U.;
?.~.
A-1.
Analysis (model) research Wi:
'j A-2.
Zaloudek-Moody leak discharge model instead of the Bernau111-Noody p*'
model.
9 t
A-3.
10% uncertainty on ANS Decay Heat generation data af ter 1000 seconds Y:
instead of the 20% margin. This fix could require a rule change.
I/:-
pf-
' ec1 A-4~.
Increase in the steam generator level set. Make the 40 foot Arv y.:.
~"
level control safety grade.
Q' F'
A-5.
Operator Action. Depressurias the primary or the secondary side by Q
the operator action.
g
<k.
A-6.
Increase the RF1 capacity or availability..
Q
{"
2 A-7.
Investigate the feasibility of a break size of the' order of 0.05 f t 7:
in the pump discharge piping.
by A-8.
Derate the plant power level.
' A-9.~~Use rated conditions and/or as-built data.to do a plant by plant I.f-fM
~~
analysis instead of a generic analysis.
y-c:
?-y c.
t
.w
=
p t.
r s-s
- i..
6
~
.: _ M 0,7
~
r 2 4 7_'3._[
0__2.27
.a_
- -...