ML20136A787
| ML20136A787 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Calvert Cliffs, Saint Lucie, Maine Yankee, Fort Calhoun  |
| Issue date: | 12/19/1995 |
| From: | Tschiltz M NRC |
| To: | Shirley Ann Jackson, The Chairman NRC COMMISSION (OCM) |
| Shared Package | |
| ML20136A623 | List: |
| References | |
| FOIA-96-485 2.206, DD-95-22, NUDOCS 9703100048 | |
| Download: ML20136A787 (5) | |
Text
- - - ~. - -. -
() l
.i i
December 19,,
1995 j
Note To:
Commissioner Jackson J
f From:
Michael Tschiltz]
i i
Subiect:
DD-95-22, Director's Decision Under 10 CFR 2.206, In the Matter of MAINE YANKEE ATOMIC POWER COMPANY (Maine i
Yankee), OMAHA POWER DISTRICT (Fort Calhoun Unit 1),
i BALTIMORE GAS AND ELECTRIC COMPANY (Calvert Cliffs l
Units 1 and 2, NORTHEAST NUCLEAR ENERGY COMPANY (Millstone Unit 2) AND FLORIDA POWER AND LIGHTG OMPAIE (St. Lucie Unit 1)
_r, Recommend:
No action, allow review perir,# to expire 4
f
==
Conclusion:==
The Director's Decision which denies petitioner's j
request for immediate shutdown of six pressurized ~
l water reactors will be a final decision.
3 i
1 Backaround:
Mr. John F. Doherty, J.D.,
filed a 10 CFR 2.206 Petition requesting that the six subject reactors be immediately shutdown.
The reason provided was that these facilities had a
]
steam generators of the same design and similar age as those at Maine Yankee which had not been inspected using the Plus Point probe system.
Therefore, since the Plus Point probe revealed steam generator tubes on the verge of rupture at Maine Yankee, the potential for similar situations existed at the named facilities, which poses a threat public health and safety.
1)
The NRC has confirmed that based on experience to date that the standard eddy current inspection techniques which utilize a j
motorized rotating _ pancake coil (MRPC) provide a reliable means fof det'ecting circumferenti'al cracking.
i 2)
Circumferential cracking has been noted only at specific locations.
Inspections of these specific locations at the 7r subject plants have been performed using a technique capayle of i
detecting circumferential cracking.
The one exception i~sg Millstone imit 2 which replaced its steam generators in J6nuary 1993.
i is is based on the results o examinations and in sRu tests performed on the most severely i
degraded tubes (i.e. defects larger than current NRC limit allows) removed from MainesYankee.
Test results demonstrated I t vr a int 03rr:'d W i k'Od la rJ 1:' u 'h ! - '
, d a.:c mtimf m
.m &
9703100048 970228 PDR FOIA BINDER 96-485 PDR
e that there was significant margin bpfore failure of these' tubes under postulated accident conditions.
4)
The fact that circumferential cracks at Maine Yankee went undetected was due to " inadequacies in the MRPC test and analysis procedures" and not due to the limitations of the MRPC probe in the detection of circumferential cracks.
The NRC has evaluated the potential for this to occur at the six plants listed and determined that the continued operation until the next steam generator inspections was acceptable.
~
l i
ll 1
i.
l i
d i
1 J
J h
.i
=l
~4 t r-1 1
i i
d 4
1 s.
. ~.
pg.....-
gyg yji nounNosue l acaem
...,I
! = <w - -->
=
= =
=
Comm. Jacksop JgQ~
R. Boyle J. Johnson K. Winsberg c7/or J. Shoemaker J. Mullikin P. Celenza y..
Lemnasan Kr.:eu M_ fmaw voceave.s moswr w
' RrevMMcND: 130 ACmu ( atme. Finac
%9Qc phtequ
- 9L-CA 2%al< pc.1
%g
,:e.%w a1.-tl.a sea r% #
..m.
a m m.mosta.~ q.
e
%-u a
+
ed,Oedw"tw 42ax.4M g
(F, Vf FCC,c. % m 4<
, Q %d m mL %
~~
e,,
g e.,u a y % AwAa.h m % Q ~kF G4 C-g,A m
' s # ',A414 A)L C < ret u ~s ri,
ins k
a.
I
,,,y M"
2 818E38088 Giamsest=_;-~.
CDfth8CTuose
- A0ts summer p-OAT.
m I
a In!ct'atica il t'n r::ar:' ms dQ!ed in c;cerJa:;ca 'i,!n 3.a f r.edem ci io!armatiorf Act, eunguonsS__ __
F0IA-9(-V88
'-%'8M.
--m.,
"*4u,
"'"a.4y ammy a, b
gf j l
- n nel
~,
- *re wT
~
ftoI Jr
,Com. Jackson J&(2,l f
R. Boyle I
J. Johnson l
j It x. u<ns8.co nc,,w ;g I
l f
J. Shoemaker l
I J. ~ m u,,
P. Celenza I, _
E I.
E ll9
'- lMWh Ato Ac.7 top OW Dreccwn m
. mal-)
54% lwd mL y W b w _-
~ L^ 1<"4
'# & % g a ~w&~.
AJK c puu m.
A qanzm,-
~ & o.AM r t aaa
~
m
@ "~ f l
['1 & %
5 2 : $p
~
~
R,
1 i
- %erto
""'O C
~
-L
- tt amo ossne
~,-
I mm maw I
l=
Ey,
1- -
i i
l 3
1 N. ', $ $ }
'+b e
a E, s.ca,t :,i ::a in.doin o c cf ! i tmatiod 50,07.6th U00$ 1 F0lA... 9 ffJ j
... -.. ~. -.
CDOUTING SLIP Dhl
$["" "
"C" N**
'^
I lr- -- ni m MLsto,l i
- c. e j
Irm _ =,
h,Comm. Jackson,
/j
.g _
f j
l l
f R. Boyle l
J. Johnson-l l
i
/[n) l K. Winsberg f
J. Shoemaker J. Mullikin 4(jfg l
l l
l l
P. Celenza l
l
\\_
l l
\\
l
)
66
=
~
.-.D.
SEG A77XCf(64 st/OM
- )
I
"~"
u i
k T (
i h:L a... d : H-I gz,_
~ ~.,..
aa'*= amanme
~
N,Unt or HubClatamV ACTeces
~
1 IBGt8 Amp Deffmov
-- saa =
I-
=
arrace
- ~~
l "I'
1 l
1 3
j la f ;+
4:
] { '. I.
.-148.' ]
,a
...J
- e.J :..J.L J ',l.
U.; iIL.,20..i O lD.CimJt! ri I
0 y
\\
i.it, c.;eriphar..; [
W l
FoiA.
94-4 U
.