ST-HL-AE-1293, Forwards Responses to Main Cooling Reservoir Action Items Discussed in 850402 Meeting,Including Results from Supplemental Tests/Borings in Area Near Embankment Station 40 + 00

Forwards Responses to Main Cooling Reservoir Action Items Discussed in 850402 Meeting,Including Results from Supplemental Tests/Borings in Area Near Embankment Station 40 + 00

ML20129C294
Person / Time
Site:	South Texas
Issue date:	07/01/1985
From:	Wisenburg M HOUSTON LIGHTING & POWER CO.
To:	Knighton G Office of Nuclear Reactor Regulation
References
CON-#385-690 OL, ST-HL-AE-1293, NUDOCS 8507160129
Download: ML20129C294 (21)

Text

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The Light Company n,xist,ui u wi>g u,- m n,x im) umisi<uimxas mii m em2n x

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July 1, 1985 ST-HL-AE-1293 File No.:

G4.2, G9.17, C13.5.3 Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555 South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Response to Main Cooling Reservoir Meeting Action Items

Reference:

ST-HL-AE-1240, May 6, 1985

Dear Mr. Knighton:

As discussed in the April 2,1985 meeting with your staff and discussed in the above referenced letter, the following items are provided in reference to the Main Cooling Reservoir (MCR):

(1) Results from the supplemental tests / borings in the area near Embankment Station 40 + 00. [ Attachment I].

(2) Figures to be added to the FSAR of the wave barriers used in the area where the circulating water pipes cross over the embankment [ Attachment II; figures 2.5.6-20 and 2.5.6-21].

These will be included in an amendment to the FSAR by September 30, 1985.

(3) A draft outline of the MCR operating procedures applicable after initiation of STP commercial operation.

[ Attachment III]. Appropriate procedure text will be drafted subsequent to the elevation 35 foot hold evaluation. These procedures wil's be submitted by October 31, 1986.

8507160129 85070!

f PDR ADOCK 05000498 I I A

pyn W2/NRC4/g

y -.

q ST-HL-AE-1293 File No.: G4.2, G9.17, l

C13.5.3 Page 2 at (713)you should have any questions, please contact Mr. M. E. Powell If 993-1328.

Very tru

yours, M. R.'

ise urg Manager, Nu lear Licen ing RLE/as Attachments:

(1) Results of Embankment Foundation. Investigation 9 Station 40 + 00 (2) Wave Wall Figures (3) Draft Outline for the Operating Procedures for the MCR W2/NRC4/g

ST-HL-AE-1293 File No: G4.2, G9.17, Houston tighting 8c her Company C13.5.3 Page 3 cc:

Hugh L. Thompson, Jr., Director J. B. Poston/A. vonRosenberg Division of Licensing City Public Service Board Office of Nuclear Reactor Regulation P.O. Box 1771 U.S. Nuclear Regulatory Comission San Antonio, TX 78296 Washington, DC 20555 Brian E. Berwick. Esquire Robert D. Martin Assistant Attorney General for Regional Administrator, Region IV the State of Texas Nuclear Regulatory Comission P. O. Box 12548, Capitol Station 611 Ryan Plaza Drive, Suite 1000 Austin, TX 78711 Arlington, TX 76011 Lanny A. Sinkin N. Prasad Kadambi, Projact Manager 3022 Porter Street, N.W. #304 U.S. Nuclear Regulatory Comission Washington, D. C.

20008

-7920 Norfolk Avenue Bethesda, MD 20814 Oreste R. Pirfo, Esquire Hearing Attorney Claude E. Johnson Office of the Executive Legal Director Senior Resident Inspector /STP U.S. Nuclear Regulatory Comission c/o U.S. Nuclear Regulatory Comission Washington, DC 20555 P. O. Box 910 Bay City, TX 77414 Charles Bechhoefer, Esquire Chairman, Atomic Safety & Licensing Board M. D. Schwarz, Jr., Esquire U.S. Nuclear kegulatory Comission Baker & Botts Washington, DC 20555 One Shell Plaza Houston, TX 77002 Dr. James C. Lamb, III 313 Woodhaven Road J. R. Newman, Esquire Chapel Hill, NC 27514 Newman & Holtzinger, P.C.

1615 L Street, N.W.

Judge Frederick J. Shon Washington, DC 20036 Atomic Safety and Licensing Board U.S. Nuclear Regulatory Comission Director, Office of Inspection Washington, D. C.

20555 and Enforcement U.S. Nuclear Regulatory Comission Mr. Ray Goldstein, Esquire Washington, DC 20555 1001 Vaughn Building 807 Brazos E. R. Brooks /R. L. Range Austin, TX 78701 Central Power & Light Company P.

0.~ Box 2121 Citizens for Equitable Utilities, Inc.

. Corpus Christi, TX 78403 c/o Ms. Peggy-Buchorn Route 1, Box 1684 H. L. Peterson/G. Pokorny Brazoria, TX 77422 City of Austin P. O. Box'1088 Docketing & Service Section Austin, TX 78767 Office of the Secretary U.S. Nuclear Regulatory Comission Washington, DC 20555 W2/NRC4/g Revised 5/22/85 ST-HL-AE-1293 SOUTH TEXAS PROJECT MAIN COOLING RESERVOIR EMBANKMENT Embankment Foundation Investigation at Station 40+00 General A subsurface exploration program was recently completed in the vicinity of Station 40+00 of the Main Cooling Reservoir (MCR) embankment.

The purpose of tL. exploration program was to identify the presence and extent of _ow blowcount silty sands.

The exploration program was the result of a recommendation by Professor H.B. Seed at the April 2, 1985 Nuclear Regulatory Commission (NRC) presentation concerning stability of the MCR embankment opposite the power block.

Previous work by McClelland Engineers, Inc (MEI) in the area near Station 40+00 indicated the possible presence of a very low blowcount silty sand material (Borehole R-63).

Harza's presentation to the NRC on April 2, 1985 considered the silty sand material between Station 30,1 to 45,1 to have an average fines content (i.e. passing #200 sieve) of 36% and a thirty-three percentile value of corrected blowcount of about 8 (Exhibit 1).

The range of factors of safety against liquefac-tion for this reach considering the material to have 15% fines was shown to be 1.2 to 2.6.

Considering the material with 35%

fines the range of f actors of saf ety was shown to be 1.5 to 3.1 (Exhibit 2).

Field Exploration Program The post NRC meeting exploration program around Station 40+00 consisted of 5 boreholes.

Hole L1 was located very close (within 10ft) to the MEI borehole R-63 at Station 40+00 and was drilled from the crest (El. 66+) of the MCR embankment.

Holes L2 and L3 were also drilled from the crest (El. 66+) of the MCR embankme nt at Stations 38+75 and 41+25, respectively.

Hole L4 was advanced from the downstream berm (El. 35+) at Station 40+00 of the MCR embanknent.

Hole LS was located at the upstream toe (El. 30+) at Station 40+00 of the MCR embankment.

The location i

of these boreholes as well as previous exploratory boreholes in the area near Station-40+00 are shown on Exhibit 3.

The most recent exploration program consisted of 298 linear feet of drilling.

Nominal 4-inch diameter holes were advanced using rotary wash techniques with a side discharge bit.

Bento-nite drilling mud was used to stabilize the boreholes.

Standard penetration tests (SPT) were conducted at 2.5 ft intervals in the foundation material in each of the boreholes.

All testing l

I June 1985 l i

(

(

ST-HL-AE-1293 conf ormed with ASTM-1586.

The same calibrated drill rig and operator used in the previous Harza exploration were used during this exploration to avoid having to de termine the ope r ator/ rig energy efficiency again.

Data Evaluation An energy efficiency of 47% (calibration value used during the Harza 1984 investigation) was used to adjust the SPT blow-counts from this program to an average of 60% delivered energy.

Blowcounts were also corrected for the ef fects of confinement.

The corrected blowcounts, N1(60), and subsurface stratigraphy for the cross section at Station 40+00 and the profile along the dam axis from Station 38+75 to 41+25 are shown on Exhibits 4 and 5, respectively.

For comparison MEI borehole R-63 has also been included on these exhibits.

A laboratory testing program consisting of natural moisture content, gradation and Atterberg limits was perf ormed on select-ed SPT samples from the boreholes.

A total of 21 SPT samples were tested to verify field classifications and determine the percentage of fines.

Laboratory testing was performed on the site by Pittsburgh Testing Laboratory (PTL) personnel.

The results of the laboratory testing program are presented in sum-mary form in Exhibit 6 The vertical and horizontal extent of low blowcount silty sand (N1(60) 315) ma te ri al is ide nt if ied on Exhibits 4 and 5.

The zone of low blowcount material is located between Elevations 7 and 15.

Laboratory testing of SPT samples of silty sand material within the identified zone indicates an average fines content of about 20% in the vicinity of Station 40+00.

The corresponding average corrected blowcount for this same silty sand was found to be about 12.

The thirty-three percentile value of the cor-rected blowcount is 11.2 and was used to determine the cyclic strength of the material under investigation.

A sumnary of the corrected blowcounts and pe r ce nt fines used to characterize this silty sand material near Station 40+00 is presented in Exhibit 7.

The cyclic strength corresponding to a corrected blowcount of 11.2 with a fines content of 20% was interpolated using the strength curves for materials with fines contents of 15% and 35% (Exhibit 8).

A correction factor of 1.32 was used, as recommended in Reference 1, to obtain the liquefaction resistance (strength) equal to 0.24 for the SSE M=6 earthquake.

This strength is higher than the values reported for this area at the NRC presentation in April 1985.

As seen on Exhibit 1, ST-HL-AE-1293 I

~

i the cyclic strength reported previously cohresponding to the thirty-three percentile value of corrected _blowcount of 8.1 ranged from 0.18 to 0.22 for fines contentt of 15% and 35%,

respectively.

Therefore, the resulting computed factor of safe-ty against liquef action for the low blowcount zone around Sta-tion 40+00 would be higher than the minimum value for the zone f rom Station 30+ to 45+ reported previously at the NRC meeting.

The computed factor of safety against liquef action under the crest, bern and in the free field are found to be 3.4, 1.6 and 1.8, respectively.

Summary A foundation investigation program around Station 40+00 was performed to identify the possible presence of a very low blow-count silty sand material reported in one boreholo (R-63) during the design phase investigations by MEI.

Five boreholes extend-ing through the full depth of low blowcount silty sands were drilled at and around the location of borehole R-63.

Standard penetration tests were conducted at 2.5 ft.

intervals in the foundation material in each of the boreholes.

The holes were drilled and SPT were performed using recommended SPT procedures for use in liquefaction correlations (Ref. 2).

The exploration was performed using the same operator and rig which were provi-ously calibrated for energy ef ficiency during an earlier Harza exploration in 1984.

Laboratory classification tests were also performed for identification of material and to determine the percentage of fines (material passing No. 200 sieve).

The recently collected data were evaluated to identify the presence of low blowcount silty sand material in the foundation of the MCR embankment.

Representative blowcount values were used to determine the cyclic strength of the identified material and were compared with the values which were presented ag* the NRC meeting on April 2, 1985.

i The major findings of this investigation and evalua61on are summarized below:

o The very low blowcount silty sand (N=3 at El 10+'and N=4 at El 5+) reported in the design phase borehole R-63 was not encountered in the recent investigation around Station 40+00.

The previously reported very low blowcounts could possibly be due to the variation of drilling and SPT opera-tions.

o A low blowcount silty sand layer (N <15) has been identi-fied between El. 7 and 15.

The cyciTc shear strength cor-responding to the thirty-three percentile value of the corrected blowcount of 11.2 with about 20% fines is found to be 0.24.

This strength value is higher than the previ-ST-HL-AE-1293 ous values for the identified low blowcount material from station 301 to 451 presented at the NRC meeting on April 2, 1985 and the factor of safety is correspondingly increased.

The minimum computed factor of safety around Station 40+02) is 1.6, compared with a minimum of 1.2 for the reach froro Station 301 to 451 determined on the basis of the earlier data.

References:

1.

Seed, H.B.,

Idriss, I.M.,

and Arango, I.,

(1983)

" Evaluation of Liquef action Potential Using Field Perform-anbe Data," Journal of the Geotechnical Engineering Divi-sion, Vol.

109, No.

3, March, 1983.

2.

Seed, H.B.,

Tokimatsu, K.,

Harder, L.F.,

and Chung, R.M.,

(1984) "The Influence of SPT Procedures in Soil Liquef ac-tion Resistance Evaluations," University of California, Berkeley, EERC Report No. UCB/E ERC-8 4/15, October.

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i PROFILE ALONG DAM AXIS STATION 38+75 TO STATION 41+25

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SOUTH TEXAS PROJECT STATION 40+00 EXPLORATION LABORATORY TESTING

SUMMARY

i Sample Sample Borehole No Depth Elevation N,(c.)

Classification

1. 200 LL PL

]

L-1 50 16.0 8

SM 32.3 L-1 52.5 13.5 12 SM 12.3 L-1 55 11.0 11 SM 12.8 l

L-1 65 1.0 19 SP-SM 9.5 L-1 67.5

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SM 36.9 l

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L-5 17.5 12.5 14 SM 25.5 i

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CHARACTERIZATION OF LOW BLOW COUNT SILTY SAND MATERIAL-N, (60) <15 Borehole Sample Sample Material

_ (60 )-1/2 a Ava. -4200 %

Station No.

Depth Elevation Type

-8200 %

N,(en)

N, 40+00 L-1 50.0 16.0 SM 32.3 8

12.1-0.9 19.8 L-1 52.5 13.5 SM 12.3 12

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41+25 L-3 50.0 16.0 SM 36.9 8

L-3 52.5 13.5 SM 17.4 11 L-3 55.0 13.0 SM 12.8 13 L-3 57.5 8.5 SM 11.9 12 L-3 60.0 6.0 SM 11.9 14 1

40+00 L-4 20.0 15.0 SM 30.9 14 D/S Berm L-4 21.5 13.5 SM 29.6 13 L-4 25.0 10.'O SM 14.2 11 40+00 L-S 17.5 12.5 SM 25.5 14 U/S Toe L-5 20.0 10.0 SP-SM 11.1 13 4

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From Seed, et al (1984)

BECHTEL ENERGY CORPORATION SOUTH TEX AS PROJECT CYCLIC STRENGTH OF i

POTENTIALLY LlOUEFIABLE MATERIALS HARZA ENGINEERING CO., CHICAGO

.. PROJECT MAN AGER DATE DWG. NO.

APRIL 1985

Attachment II ST-HL-AE-1293 QEMEANKMENT k

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Attachment ~II ST-HL-AE-1293 EMSAMKMENT h-4 EMS. OUT LINE

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I S E C T i o hJ SOUTH TEXAS PROJECT UNITS 1 & 2 WAVE WALL AT CIRCULATING WATER DISCHARGE CHUTE Figure 2.5.6 21

Attachment III ST-HL-AE-1293 South Texas Project Main Cooling Reservoir (HCR)

OPERATING PROCEDURES (Outline) 1.

PHYSICAL DESCRIPTION OF THE PCR This section will cover the following aspects of the MCR:

1A. Embankment Physical description of the embankment geometry and physical characteristics of the various features of the ICR.

18. Underseepage Control System A description of the underseepage control system, details of typical relief wells.

1C.

Instrumentation A description of the instrumentation system, including placement of instruments around the reservoir and pertinent details on each instrument type (piezometers, inclinometers, settlement points and benchmarks, centerline surveys and lateral displacement pins, and relief well monitoring system).

10. MCR Systems Brief description of Makeup, Blowdown, Spillway and Circulating Water Systems.

2 OPERATING PROCEDURES FOR SYSTEMS This section will contain guidance on the operation of the systems listed below. Criteria for making withdrawals from the Colorado River, criteria for withdrawals during drought, conditions under which the Blowdown system would be operated, and procedure during floods will be discussed.

2A. Makeup l

28. Blowdown 2C, Spillway 2D.

Circulating Water Intake and Discharge 2E.

Other Systems 2247a/0060a i

Attachment III ST-HL-AE-1293 MCR OPERATING PROCEDURES (Cont'd) 3.

NORMAL MAINTENANCE PROCEDURES This section will contain detailed procedures for general maintenance of the MCR, the MCR embankment and related systems.

3A. Dike Maintenance This subsection will contain general data and procedures on slope maintenance including weed and brush control and mowing schedule.

Guidance for routine repair of embankment crest and slope cracks will also be provided. Criteria for determining what constitutes a serious embankment crack that should be reported to higher authority prior to repair will be presented.

38. Relief Well Maintenance This subsection will cover routine maintenance which will be performed to ensure the system perfoms its function of controlling seepage and seepage pressures.

3C. Drainage System itaintenance This subsection will contain instructions for maintaining site drainage ditches, and those sections of the embankment where a horizontal drainage blanket and collector pipe is provided.

Frequencies of required maintenance and observations to be made during the course of maintenance work will be included once sufficient operating history is available.

3D. Mechanical Systems Maintenance This section will contain guidance for checking the physical condition of exposed Circulating Water piping and routine repair of joint packing or corrosion protection. Recommendations for routine exercise of spillway and blowdown gates will be provided.

Pump and equipment maintenance procedures will be included in specific system descriptions / operating procedures and will be cross referenced here.

4 ORGANIZATION 4A.

Organization Chart During Operation 4R. Response / Notification System This section will cover the lines of communication during operation, for routine inspections and evaluations as well as abnomal conditions.

2247a/0060a 2

Attachment III ST-HL-AE-1293 MCR OPERATING PROCEDURES (Cont'd) 5.

INSPECTION AND MONITORING PROGRAMS This section will contain guidance and frequencies for routine inspections and instrumentation monitoring.

Procedures for preparing reports and reducing and presenting data will also be specified. Reg. Guide 1.127 and the existing project monitoring and inspection specification will be used as a guide in preparing this section.

6.

EVALUATION OF ABNORMAL (UNUSUAL) CONDITIONS Details of this the section will be provided once an operating history has been developed during filling and hold periods.

7.

REMEDIAL ACTION This section will contain guidance for rapid response should remedial action be required. Sources of filter material and fill, along with sources of emergency embankment repair equipment will be identified.

Emergency remedial action procedures for the various mechanical systems will be presented.

2247a/0060a 3

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