ML18017A462
| ML18017A462 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 10/10/1978 |
| From: | Cardonne A Office of Nuclear Reactor Regulation |
| To: | Stepp J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18017A463 | List: |
| References | |
| NUDOCS 7810130219 | |
| Download: ML18017A462 (5) | |
Text
J 1i, Og g P.1978 MEMORANDUtf FOR:
J. Carl Stepp, Chief Geosciences Branch,,DSE FROM:
A. T. Cardone, Geologist Geosciences
- Branch, DSE THRU:
SUBJECT:
R. E. Jackson, Section Leader Geosciences
- Branch, DSE I
SITE VISIT TO THE SHEARON HAMUS NUCLEAR POWER PLANT On September 19, 1978 NRC staff members L. Heller, 0. Thompson, and I visited the Shearon Harris plant site.
Accompanied by representa-tives of the Carolina Power and Light Company (CP&L), Ebasco Construc-tion Company, and Law Engineering
- Company, we inspected the core trench along the west half of'he main dam and excavations for the diversion conduit, and wpillyayy'. A.short section of the auxiliary dam foundation was also available for inspection.
Following the field inspection all parties met to discuss the additional geologic and geotechnical information required of CP&L.
An attendance list is attached.
A few hundred feet of core trench excavation along the auxiliary dam was inspected.
The exposed bedrock consisted of Triassic sandstone with prominent open pointing which trends Nlo 8, nearly perpendicular to the centerline of the dam.
The points, spaced approximately 40 feet apart, were not visible in the underlying siltstone and appeared to be truncated by younger Triassic overlying strata.
CP&L plans to establish a grout curtain through the 5ointed sandstone into the relatively impermeable siltstone Einneath the core trench.
The dam foundation will be mapped in detail.
The main dam core trench was obsaured by soil and broken rock which had not been removed prior to aur Mspection, however, the trench waU.s were sufficiently free of soil and debris so that gross anomalous geo<<
logic conditions were discernable.
The trench was exc'avated into typical Piedmont Paleozoic rocks.
Faulting was not bbsemdd in the walls but it cannot be precLuded until the trench is cleaned and map-ped in detai1.
7f 10 l3o2.ly ORRICE~
SURNAME~
DATE~
See next pa NRC PORlC 318 (9-76) NRCM 0240 4 Ul S, 4OVERNMENT PRINTIN4 ORRICE1 I070 020 024
,0 GKt'Ol TOP I"
4(v p
p
~, r,v" 'I' v
"(
I PS
,II 6' I't 6
v
)
I Itrr>
tt I "4
<<pt
- h
)
"- r,f 6
~
r v
(
<<r<<
Il I
P I
t t
6,
'<<P f vt 6
'6 (,I v
i t
4
<< I.-i.'
t H
H P
~
"I I
~ f ti C
I ll r
t v-r
'6 I
P I
'f P'
f V
- Pl I( )'H I
V y) 6$
t 6
f v
I I
,64$
J, I
t~
Oy g g 1978 J. Carl Stepp The diversion conduit was also obscured by soil and debris at the time of our visit.
At diversion conduit station 2+70 I noted two small offsets which displaced an epidote marker not more than 2 inches, and appeared to terminate approximately 10 feet above the marker.
Approxi-mately 50 to 100 feet southeast of the small offsets were two altered zones of what yppeared to be chloritized schist, within massive fresh granite.
No offsets were observed to be assoicated with the altered
- zones, however, there appeared to be large inclusions of granite with-in the%ones.
I later learned, in response to my questioning about the zones, that the large inclusions are boudins, indicating that the zones may be associated with faulting. I asked the geologists who accompanied me on the inspection to define the nature and extent of the altered zone and any associated faulting after the excavation is cleared.
At the meeting that followed the field inspections, CP&L was reminded that we should be provided the information and mapping of the altered zones and possible faulting in the diversion conduit excavations.
CPGL indicated that they intended to construct the rockfilled portions of the auxiliary and main dams using on-site materials.
They had con-structed two test fills using rock from required excavations.
Our inspection of the one test fillthey considered "acceptable" indicated that the rock used was very slabby and gap-graded.
No laboratory gradations of the test fills were availaMh.
Qe questinned the suit-ability'~f,these materials and 55Rhd CPSL to review their CP criteria, the minutes of licensing meetings, and hhe Corps of Engineer recommenda-tions cbnc~gg the design and construction of these dams.
I asked that NRC be kept informed -nd that we would probably want to visit t4e site after the conduit excavation was cleaned and mapped.
A. T. Cardone, Geologist Geosciences
- Branch, DSE cc; R. Denise 0, Parr S. Miner L. Heller O. Thompson DISTRIBUTION:
CENTRAL FILE NRR RDG GB RDG orrlcE~
SURNAME~
DATE~
e DS:ST' DS DSP:S.
Ca.dana:kg..........acks
.........,...Me
...10/..L7.8.............,..1Ol.........a...........l.0l..
J7..8.
NRC FORM 318 (9-76) NRCg..0240 Q ui s. CDYERMMEMTrmMTiRo orr>cd sere - eee-eve
I P',gJ 4 gt I,P I
It 4
I H>>4 Pfr>>PPI, k
(
IP f.
I 4
4, Jl ~
I r 1 A
I P tt ~ ~
3 I
H
>> I.
I I
I I
~,
>> 4>>->>
$ HA I
,>>4 1>>'L I
g~>>I, 4
.P TQ I
444 It "H
I I 'I I
'I t
!I r ~
I II "I 4
I n
tP V~
>>H r,
>>4>>
4 l,l I
P t 4IH t
MEETING SHNPP SITE SHNPP DAM CONSTRUCTION NAME ORGANIZATION Bob Black Lyman Heller Owen Thompson James Hevill N. 'k. Tilford M. Hayes Payne Johnson A. T. Cardone Ismail Ciloglu Dan Johnson Alex Fuller David Canady J. T.
Cox F.
R. Foster George L. Forehand Charles Nail, Jr.
CP&L - Licensing USNRC DSE USNRC DSE CP&L Ebasco Ebasco CP&L USNRC DSE Ebasco Ebasco CP&L Site Representative CP&L Geologist CP &L Law Engineering CP&L QA CP&L Area Engineer