ML19208A718
| ML19208A718 | |
| Person / Time | |
|---|---|
| Site: | Phipps Bend  |
| Issue date: | 09/11/1979 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909170335 | |
| Download: ML19208A718 (4) | |
Text
8 TENNESSEE VALLEY AUTHORITY CH ATTA NCOG A. TENNESSEE 3740t 400 Chestnut Street "_r~.r II September 11, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Coc: mission Washington, DC 20555
Dear Mr. Denton:
In the Matter of the Application of
)
Docket Nos. STN 50-553 Tennessee Valley Authority
)
STN 50-554 In a September 4,1979, telephone conversation, Jerry Wills of my staff notified Bob Benedict of your staff that additional faults had been discovered at our Phipps Bend Nuclear Plant in the area of the intake pumping station. A conference call was subsequently made to the NRC geologist, Sandra Wastler, on September 4, 1979, to discuss the fault.
The enclosure provides a detailed description of this feature.
We do not consider this minor fault to be capable within the meaning of Appendix A to 10 CFR Part 100.
Very truly yours, TENNESSEE VALLEY AUTHORITY
. M. Mills, Manager Nuclear Regulation and Safety Enclosure
&>ii221 d\\
7 909170 3 M uew==w wie
=,cn
t PHIPPS BEND NUCLEAR P LANT Thrust And Transverse Faults In The Intake Pumping Station Aiea Final excavation of the intake pumping station has exposed two thrust faults and a series of transverse faults.
(See attached map.)
Fault number 12 has been removed in the pumping station excavation, but is visible for 70 feet on the south and west walls.
It is a thrust fault striking N.45' - 60*E. with a dip of 24' to the SE.
(See photograph #1. )
Thrust fault number 13 (see photograph d2) strikes N.45* -
60*E. and dips 45* - 50* SE.
The plane of this fault cuts the north wall of the pumping station and trends southwest across the floor of the excavation for approximately 80 feet where it is visible in the west wall.
Both of these faults are chcracterized by highly contorted beds in the upper plate that fcrm tightly folded plunging anticlines and synclines. The lower plate shows little contortion of the beds which are dipping 25* - 30* SE.
Both of these fault planes are calcite healed, but become weathered as they near the top of rock.
Fault number 14 is a series of N.0* - 10*E. trending trans-verse faults which dip 80* - 90* to the east and are calcite healed.
The longest of these is visible for approximately 40 feet with a maximum 6 inch displacement of the beds.
(See attached map and photo-graphs 43 and 44.)
These faults are not considered to be capable of producina ground of fsets or generating earthquakes.
Therefore, we do not consider them as capable faults, within the meaning of Appendix A to 10 CFR Part 100.
rf:.
3,3q mJd ur rewq,
IhTAKE PUNPING STATION 9 l*3 E
J k
1 8-n S
N g
=
h gFAULT 13
,. - - ~ ~. _ _
g/
r, a y-,
y f
g w
~ s^'
D9
'f ELIO78.3
' 25 El.1076.4
,e 33 Photo #1
/~&[,
l,y x/
~~.
[/ ; /
!53'-l A
- si es
///
/
.bh.
4
.4V? "'
f
/'
,/,p[, f l f
FAULT 12 Photo #3 7igi 8, s, 24,
o.
,ic.1 rn won )
,,,l A
k El1078.3
'4./ a..
6 I
y]
//
!/
El.lO77.2L 1
,4 J,
/
,;w 1
Y~ "f a
i
,s SCALE:
E b4"e ' '
/
!(3
- #~7-
///
i I"= 16' FAULT 14 +
A'"
Photo #4
nO fdh N.'
~ * )
=:: p. :'
. ~,~ u,., e 1
. ~.
r,
-g f' UL T t.3 i
.... :. # ~
A
- 4-
~.
r(
d a.
_)
8
} */
a
=5J*
- ~
- fth
_h p. dE'r 4
. it-C$) ' n-:WQ
~
h A.
- l
'^
='
^
' s
.* Y., s,
~_:
... -.. - nn m - ;-. z. n.
~. :a, - ~~ x
~
PHOTO el Paults #12.& R13.
~ ~ ~ -
~ -
s=
'2 Viw West
,_wx %
u _.. -.<.x 7-.n.a. u w~'
,_...m,,
.:-....c.....,,
PHO'IO #3.- Fault #14 View North
- a u.w..
s.:.':.
........ ~.. ~> --~ n.
1 3
f 1,
f ".
et 4
w.
l
.s
-, =.
PHOTO 42 - Fault #13 '
View Northeast
.t
...s.-.-
PHOTO #4 - Fault #14 View North 300RORSNAL ssu m