ML17258A454
| ML17258A454 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 01/15/1982 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17258A455 | List: |
| References | |
| TASK-02-04.D, TASK-02-04.F, TASK-2-4.D, TASK-2-4.F, TASK-RR NUDOCS 8201200220 | |
| Download: ML17258A454 (23) | |
Text
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AUTHOR AFFiILiiATION MAIER~J.E-;.
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RECIP, NAME!
RECiIPIIENITi AFFIIllIATI ON CRUTCHFIELDED OoeratIing.Reactors'ra'nch 5
SUBJECiT:
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ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E.
MAIER VICE PRESIOENT TELEPHONE ARKA cooc 7ld 546.2700 January 15, 1982 g
@<C~',;a~
Director of Nuclear Reactor Regulation 5
Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
SEP Topics II-4.D, Stability of Slopes, and II-4.F, Settlement of Foundations and Buried Equipment R.
E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
During the initial Ginna Integrated Assessment meeting, held in Bethesda from December 1 through December 3,
- 1981, a request for additional information regarding the June 30, 1981 Rochester Gas and Electric safety assessments for these two topics was made.
This information was provided to Dr.
Tom Cheng of the NRC on December 24, 1981.
This letter formally transmits the information provided directly to Dr. Cheng.
The information should be sufficient for the NRC to develop a draft Safety Evaluation Report for this SEP topic.
Very truly yours, Attachments pc~S
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Attachment 1
Additional information relative to assessment of SEP Topic II-4.D, Stability of Slopes, for the R.
E. Ginna Nuclear Plant In order to provide additional confidence in the original RGGE assessment regarding this topic, provided by letter dated June 30,
- 1981, the following information is provided.
1.
RGaE Drawing 33013-352, showing as-built topography for R.
E. Ginna plant, with all boring locations noted, as well as the slope locations.
2.
Boring logs for borings 1, 3,
- 107, 108,
- 119, and 124.
Please note the difference between the original surface elevation and the present elevation as given in the topo-graphical map.
The subsurface investigation is described in the February 1974 Dames and Moore Report, listed as Reference 1 in RGRE's June 30, 1981 letter.
The following is noted in Section 5.2.1 of that report:
.materials of the site are composed.
..of two till sheets.
The lower till is a grayish red, calcareous, clay-loam. It is poorly sorted, and contains striated and faceted pebbles, cobbles and boulders.
The base of this lower till rests directly on bedrock.
Borings indicate that total thickness of the lower till ranges from 6 to 24 ft.
The upper till consists of olive gray, calcareous, silty clay and yellowish brown, silty clay with fine to medium-grained sand.
Included rock fragments range from fine gravel to boulders more than 3 ft. in diameter.
The frag-ments are generally angular to subangular, faceted and striated.
The upper till is a relatively uniform blanket ranging from 7 to 30 ft. thick."
As can be seen from the topographical map, borings Cl and 53 were taken in the immediate vicinity of the slopes.
The detailed stratigraphy of the slopes is derived from these borings.
Because of the differences in topography between the site at present and the site prior to construction, the lower grayish-red layer of till, designated as CL in the borings, is the focus of attention relative to slope stability.
The soil mechanics books referenced in the bibliography of the June 30, 1981 assessment of SEP Topic II-4.D present accept-able methods to determining the factor of safety of infinite slope from slope failure and slides.
The most common basis used for defining the factor of safety is by means of the strength of the soil, or
h I
h J
~
~
4 K
F, Factor of Safety
= Shearin Stren th, s
s Shearing Stress, t
If all of the cohesive resistance of the slope is mobilized, then this relationship can be simplified to read F
= tan g
~Can (see page 472, reference
¹8 of 6/30/81 assessment)
Where g is the internal angle of resistance of the soil at ultimate strength and g's the developed internal angle of resistance of the soil in its equilibrium state; in this instance, the existing angle of repose of the slopes.
The lab work-up for the triaxial tests performed on soil samples by Dames 6 Moore was not included in the data supplied to RG6E at the conclusion of the subsurface investigations.
Therefore, g must be derived from tests perfor'med upon similar soils, the results of which are found on page
¹149 of reference
¹7 of the 6/30/81 assessment.
The angle g for a dense, silty-clay, medium plastic, soil at peak strength can be conservatively estimated to be 32',
as shown in table 11.3 as referenced above.
With the steepest angle of
- repose, g',
found on site to be 7.5 feet horizontal to 1 foot vertical, then tan g' 1
ft. = 0.133 7.5 ft.
F
= Tan
= Tan 32' 4.7 Tan '.133 This is the result stated in the submittal made for SEP Topic II-4.D in June of 1981.
a" I.,E h
Attachment 2
Additional information relative to the assessment of SEP Topic II-4.F, Settlement of Foundations and Buried Equipment, for the R.
E. Ginna Nuclear Plant In order to provide additional confidence in the original RGGE assessment regarding this topic, provided by letter dated June 30,
- 1981, the following information is provided.
1.
RGSE Drawing 33013-60, showing the Ginna plant site, with locations of buried piping detailed.
2.
RGGE Drawing 33013-53, showning same encasement details for the Service Water piping (including a specification page).
3.
Installation procedure for buried Circulating Water System piping.
Although a comparable specification was not found for the Service Water piping, we are confident that the same specifications were used.
4.
Please note that boring 108, drawn on RGRE drawing 33013-352, is the closest to the buried Service Water piping.
The major structures of the R.
E. Ginna Nuclear Station have experienced no visible evidence of settlement since the con-struction of the station.
The June 30, 1981 submittal of Topic II-4.F did not elaborate on the individual building foundations.
This is provided in the following paragraph:
The foundations of the interior containment structures, the auxiliary building and the intermediate building are founded on the bedrock of the Queenstone formation, which is exhibited to be strong and fresh layers of shale, sandstone and siltstone in the boring logs.
The control building and the diesel generator building foundations were both excavated to the surface of bedrock.
Lean concrete was placed on the rock surface to a depth whereby the elevation of the top of the lean concrete was coincident with the elevation of the bottom of the foundation of that particular building.
Therefore, all of the seismic Class I structures of the R.
E. Ginna Nuclear Power Station are founded on bedrock.
No settlement has been evident and none is expected.
As noted in the June 30, 1981 submittal for SEP Topic II-4.F regarding buried equipment:
"Excavations to various depths were made in the soil to accommodate buried equipment.
In any instance when unsuitable material was encountered, that. material was fully excavated, replaced with select granular bedding material, and fully compacted.
The equipment was then encased in concrete, and backfilled with select material.
All excavation, structural placement and backfilling procedures were performed in accordance with specifications which were to ensure that settlement would be
II p,
V t,
minimized.
No settlement has been observed in areas where buried equipment was installed in accordance with this procedure in over l0 years of plant operation."
I r 9'
P p
J ss l'
SHEARING STRENGTH
/N LBS. I'SQ. FT.
8000 2500 2000
/500
/000 500 DEPTH
/N FEET P
BLOIY 0
coun r SYMBOLS DESCRIPTIONS BORING I
SORPACE ELEVATION 274 9'2>-I>>
I to 5700 I
24 IX I6 I
2I 5g-I07 2000 25'4 35 43
~
~ /0,g-l2
~
-20 ~g 9
~
ML CL LIGHT REDDISH BROWN ANO GRAY SILt WITH TRACE OF PINE SANO ANO ROOTS (TOPSOIL)
LIGHT REDDISH BROWN CLAYEY SILT WITH OCCASIONAL GRAVEL LIGHT REDDISH BROWN SILTY CLAY WITH OCCASIONAL GRAVEL GRADING WITH OCCASIONAL COBBLES GRADING GRAY IN COLOR I
9 5&I54 I
I0. 6II-I20 2I6
~ 85
- 50 95IIMl 4
GM REO FINE SANO AND GRAVEL WITH BOVE SILT ANO ROCK FRAGIIENTS GRADING WITH VIORE GRAVEL ANO ROCK FRAGMENTS GRAY FINK GRAINED SANDSTONE COBBI.E AT TDP CF ROCK RED VERY FINE SANDY SILTSTONL
- 60 BORING COIIPLETKO ON IO-I6 64 CASINO TO A DEPTH OF 59 RATER LEYEL Kff 26 4'N II 25 64 LOG OF BORING N 0 T
THE PIGURE'5 UNDER THf COLVIWI LABELEO PLOW COVNT INDICATE ')
THK NUNPER OF BLOWS RKOVIRED TO DRIVE THf OAlfES KI VOORE SOIL 5AVPLER 8 DISTANCE OF ONE FOOT INTO THE OVERBVRDKN VSINO 500'LB ~ 5LIP JARS FALLII'0 A DISTANCE OF IS INCHES ~
THE SAIIPLER IS 6 I ~ 0 AHO 2$
I ~ 0 2) tHE PERCENT OF CORE RECOVERED IN A CORING RVN IN ROCK ~
AN NX 5I Zf DOUBLE'VBf CORE RARREI.
WAS USED To CORE ROC'HALT PHASES Alif INOICATKO IN 'THK COLUIINAR SECTION RY SHORt HORIZONTAL OA5HES ~
SURFACf ELEVAtIONS REFER to VSClkGS OATUV DETAILED DKSCRIP'TIONS OF THE ROCK WILL BE PIIK5ENTEO ON OVR FINAL BORING LOGS ~
DAMES 8 MOORS PLATE IB"3d
4 ~
~ S A
S
DEPTH SHEARING "STRENGTH IN L8S,iSO.
FT.
3000 2500 ZOOO
/500
/000 500 0
covNT SYNBOLS
.DESCRIPTIONS BORING 3 SURFACE ELEVATION 26S.9'8.6$
I I4
- 13. 5$-I22 20.4$-IIO I
23 5g-I06 0
22 c
- /0 8
~
- 20 s
4 5
IT ML CL LIGHt REDDISH 8ROWN AND GRAY SILT WITH TRACE OF FINE SAND ANO ROO'IS (TOPSOIL)
OROWNISH GRAY CLAYEY SILt WITH SOME'INK To MEDIVM GRAVEL BROWNISH GRAY SILTY CLAY WITH SOME FINE SANO AND OCCASIONAL GRAVEL GRADING WITH LENSES OF GRAY FINE SANO GRADING WITH LESS SANO AND GRAVEI.
30 7
5
-40 ~
- 50 RCD F INC SANDY Sll. T WITH SOVC GRAVEL ANO ROCK FRAGMENTS GRADINO WITH VORE GRAVCL ANO SHALE FRAGMENTS REO VERY FINK SANDY SILTSTONC 98II
- 60 SoRING coMPLETKo oN IO-l9~
CASING
'To A DEPTH OF wATER LEYEL IS 25.8'N II-23 64 DEPTH SHEARING STRENGTH
/N L8S. i'SO. F T.
3000 Z500 ZOOO
/500
/000 5'OO 0
covNT 0
2I
~
54 s
BORING 4 SURFACE ELEVATION 2 9. I I SYAIBOLS DESCRIPTIONS LIGHT REDDISH GROAN ANO GRAY SILT WITH TRACE OF F INC SANO ANO ROOTS (TOPSOIL)
REDDISH GROAN ANO GRAY CLAYEY SILT WITH OCCASIONAL GRAVEL REDDISH 8RO*N SILTY FINE SAND ANO GRAVEL WITH SHALE FRAGVENTS ML ML IOo4$ l24 I
8'5-I25 I
9 4g-I37
-20~
l24 a
2g/38 GRADINO 'Wl TH MORC SILT SINAI
-40 93II REO FINE SIL'TSTONC Wl TH SOME SHALY PARTINGS ISg
- 50 ISg l00%
- 60 aoRING coMPLctco oN IO-20~
CASING To A DEPTH OF 35l RATER LEYEL 0 24 '
oN II-23 24 LOG OF BORINGS
, liiI I"II I k
OASVSQS 8 SVEOORCT PLATE IB-Sc
I
Ol I
DEPTH SHEARING STRENGTH
/N LBS. i'SO. F7:
3000 2500 2000
/500
/000 5'00 0
coUHT 0
20
~
8 6X-I2I BORING 106 SURFACE ELEVATIOH 275.3'YAIBOLS ML'ESCRIPTIONS BROWN SILT Wl TH SOME FINE SANO ANO ROOTS (TOPSOIL)
LIOHT ORAYISH BROWN SILTY TRACE OF VERY FINE SANO AND CLAY OCCASIONAL SMALL ORAVEL DRAY CLAYEY SILT WITH TRACE Of FINE SANO ANO OCCASIONAL ORAVEL I500-7. IIL-I35
- 20
~
7 66 a
- 30 44T 90
~
270/6R
~
40 20'0II
- 50.
971 1~IIL'M POVLDER REDDISH BROWN FINE SANO AND ORAVEL WITH SOME SILT ANO ROCK FRAGMENTS ORADINO WITH MORE ORAVEL ANO ROCK FRAOMEN'IS WEATHEREO ROCK RED SILTStONE
- 60 SORINO COMPLEtt'0 ON I I-6 64 CASINO To A DEPTH OF 38I wAtER Lt'Vt'L II 27 8I ON I I 22 a4 DEPTH SHEARING STRENGTH IN LBS. i'SO. FT.
3000 2500 2000
/500
/000 500 0
COUNT 0
- 7. 5II-I26 to 3070 7
EI 4
O
-20 ~~
BORING IO7 SURFACE ELEVATIOH 275. I
'YAIBOLS DESCRIPTIONS GM ML CL ML REDDISH-BROWN SAND ANO ORAVEL (FILL)
BROWN VERY FINE SANO ANO SILTY TRACE OF ROOTS ANO OCCASIONAL SMALL ORAVEL LIOHT BROWN VERY FINE SANO ANO SILT BROWN SILTY CLAY WITH TRACE OF VERY FINE SANO ANO SMALL ORAVEL DRAY SILTY CLAY 3m-IO. 74-I 32 to 3280 II6
~
. 302I~8 l90/7"
~
-40
'0$
SP GM BROWN FINE SANO ANO ORAVEL WITH TRACE OF SILT REDDISH BROWN FINE SANO ANO ORAVEL SOME SILT ANO ROCK FRAOMENTS WEATHEREO ROCK RED SIL'ISTONE 84
- 50 963
'.I:.V 98%
- 60 764
- 70 LOG OF BORINGS SORINO COMPLE'TEO ON CASINO To A DEPTH OF 39 wAtER I.EYEL II28.I'N II-22~
DAMES 8 MOORSY PLATE IB-4f
l500-7 8kl24 I I40% Vg'-l28 SHEARING STRENGTH IN LBS./'SO.
3000 Z500 ZOOO
/500
/000 500 ING IO8 s
AcE ELEIATIOH
+275. I DEPTH
/N FEET SLOIF 0
couNT 0
DESCRIPTIONS S>>BOLS 2I ML
/0 TT-l78 108
~
SP GRADING WITH TRACE'F SII.T DROWN FINE SANDY SILT WITH SOMC ROOTS (TOPSOIL)
REDDISH DROWN VERY FINE SANO WITH OCCASIONAL GRAVEI.
GRADING FINER GRAINED SANO GRADING WITH LESS GRAVEL 20-r ":
I 50 260
~
30 SM GM GRADINO WITH MORE SILt GRADING WITH ROCK FRAGMENTS SOFT WEATHEREO ROCK REO SILTStONC
- 40
= 50
=60-94$
. 70 80RING COMPLETED ON II IO 64 CASINO TO A DEPTH OF wATER LCYCL 0 24N II 22 64 BORING IO9 suRFAcE ELEYATIDH 272. I
'ESCRIPTIONS DEPTH SHEARING STRENGTH IN LBS. ISO. FT.
3000 Z500 ZOOO
/500
/OOO 500 0
coun T s>>soLs 0
2000-'5 2" )9 2000 l6 745 I7
~
/0 =r ".
I26
-=20 =r 250/6R I75/6R 200/9R
~
- 30
-40 96%
ML ML SP GM DROWN FINE SANDY SILt WITH ROOTS (TOPSOIL) dROWN SILT WITH SOME FINE SANOe TRACE OF CLAY ANO OCCASIONAL GRAVEL RCOOISH BROWN VCRY PINC SAND WITH SOMC GRAVEL ANO ROCK FRAGMCNTS WITH TRACC OF SILT GRADING TO SLIGHTLY COARSCR SAND GRADING WITH OCCASIONAL POCKCTS OF FINE TO COARSE SAND ANO SMALL GRAVEL REDDISH OROWN SILTY FINE SANO ANO GRAVEL WITH ROCK FRAGMENTS ANO POCKETS OF LIGHt BROWN VERY F INC SANO GRADING TO REDDISH DROWN VERY I'INC SAND ANO GRAVEL WITH ROCK FRAGMENTS RCD VERY FINE GRAINCO SANDSTONE
- 50 95%
60=
LOG GF BORINGS 80RING COMPLETED ON II l5 64 NO CASIIKI USED wATER LEYCL 0 25o4I ON II 22 64 f'PE(""""'AMES 8 MOORAGE PLATE ZB"4g
I
~
M
<<M
DEPTH SHEARING STRENGTH IN LBS./SO. FT.
8000 2500 2000
/500 IOOO 500 0
coIINT
~
0 -~
l0 6X 33 I~~ I4.9g-l l7
- IO l6 4g-I I7 BORING I I 9 SURFACE ELEVATION +272. I I SYMBOLS oEscRIprIoNs ML ML MLCL DARK BROWN SILT WITH SOME FINK SANO AND ROOTS (TOPSOIL)
LIGHT DROWN SILT WITH SOME FINE SANO GRADING TO GRAYISH-GROWN CLAYCY SILT WITH OCCASIONAL SMALL GRAVEL GRAY CLAYEY SILT WITH TRACE OF FINIE SANO AND OCCASIONAL SMALL GRAVEL GRADING WITH MORC CLA'Y
- 20
~
IO 46 o
l44/7R
~
8N
- 40 -
ML GM SP GRAY SILT REDDISH DROWN FINE SANO AND GRAVEL WITH SOME SILT AND ROCK FRAGMCNTS REDDISH SROWN F INC SANO Wl TH OCCASIONAL SMALL GRAVEL AND TRACE OF SILT REDDISH DROWN FINE SANDY SILT ANO ROCK FRAGMENTS REO SILTSTONE 8lg
- 60 BORING COMPLL'TEO ON I I I I 64 NO CASINO VSCD WATER LEVEL @ 27.7'N II-22 64 LOG OF BORJ NG 1'i%Litii!.',"('t DAMES 8 MOORQ PLATE I8-4n
7
~
P I
A
.Ai
.~a*,
~
~
DEPTH SHEARING STRENGTH IN LBS. iSO. FT.
8000 2500 2000
/500
/000 500 0
c0IIIIr 0
ll 24 l26
~
~ IO ~~
l48
~
- 20 r 94 l52
~
l50/9"
~
-40 86K'ORING I 24 suRFASE ELEYArIoII +275.9I SYMBOLS ML ML GM DESCRIP rIOIIS BROWN SILT Wl'IH TRACE OP F INC SAND AND ROOTS (TOPSOIL)
MOTTLED BRAY AND BROAN FINE SANDY SILT WITH OCCASIONAI. SII'ALL QRAVEL BROWN FINK SANO WITH OCCASIONAI.
SMALL QRAVCL ~
SCMC SILT ANO WEATHERCO SHALE FRAGMENTS SP QRAOINQ WITH LESS ROCK PRAQMCNTS BROWN VERY FINC SANO WITH OCCASIONAL SMALL GRAVEL QRAOINQ WITH IIORC BRAVELY SILT AND OCCASIONAL SMALL POCKETS OF COARSER SANO Rt'OOISH BROWN PINE SAND AND QRAVEL WITH SILT AND ROCK PRAQIVENTS QRAOINQ WITH MORt'OCK FRAQMCNTS RED VERY FINE QRAINCO CROSS BEDDED SILTY SANDSTONC 9lg
- 50
. GO 74%
70 85%
BoRINo coMPLKTED ON II-IOM CASINO TO A DEPTH OF 37<
WATER LCVEL e 25'I ON II-2264 LOG OF BORlNG DAMSlS 8 MOORIE PLATE IB-4s
~
~