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Category:CORRESPONDENCE-LETTERS
MONTHYEARML20211B7881999-08-10010 August 1999 Transmits Summary of Two Meetings with Risk-Informed TS Task Force in Rockville,Md on 990514 & 0714 ML20209H6921999-07-15015 July 1999 Forwards Comments on Preliminary Accident Sequence Precursor Analysis Provided in NRC Re Operational Condition Reported in LER 269/1998-04 ML20195H1681999-06-10010 June 1999 Forwards Copy of Preliminary ASP Analysis of Operational Condition Discovered at Ons,Units 1,2 & 3 on 980212 & Reported in LER 269/98-004,for Review & Comment ML20207C0321999-05-18018 May 1999 Forwards Fifth Rept Which Covers Month of Apr 1999. Commission Approved Transfer of TMI-1 Operating License from Gpu to Amergen & Transfer of Operating License for Pilgrim Station from Beco to Entergy Nuclear Generating Co ML20206E4101999-04-26026 April 1999 Forwards Four Copies of Rev 9 Todpc Nuclear Security & Contingency Plan,Per 10CFR50.54(p)(2).Changes Do Not Decrease Safeguards Effectiveness of Plan.Encl Withheld,Per 10CFR73.21 ML20205T1301999-04-0909 April 1999 Informs That on 990317,C Efin & Ho Christensen Confirmed Initial Operator Licensing Exam Schedule for Y2K.Initial Exam Dates Scheduled for Wks of 000710 & 17 for Approx 13 Candidates ML20205B0571999-03-24024 March 1999 Informs That Author Determined That Partial Exemption from 10CFR170 Fee Requirements Appropriate for Footnote 4 of Review of License Renewal Application for Ons,Units 1,2 & 3, That Staff Determines Has Generic Value to Industry ML20207C0501999-02-25025 February 1999 Submits Annual Rept Specifying Quantity of Each of Principal Radionuclides Released to Environment in Liquid & Gaseous Effluents,Per 10CFR72.44(d)(3).Effluent Release from ISFSI for CY98 Was Zero ML20202H7621999-01-28028 January 1999 Discusses Guidance Re License Renewal for Operating Power Reactors Developed in Response to FY99 Energy & Water Development Appropriations Act Rept 105-581 ML20202J1901999-01-28028 January 1999 Discusses License Renewal for Operating Power Reactors.Two Applications Received for Renewing Operating Licenses. Commission Established Adjudicatory Schedule Aimed at Completing License Renewal Process in 30-36 Months ML20198S8721999-01-0707 January 1999 Responds to Message to Marks Re Info Request on Appeal Deadline & Desire to Serve Appeal Either by e-mail or by Alternative Regular Mail ML20198Q8871999-01-0707 January 1999 Responds to to Chairman SA Jackson Re Issues for Consideration for Commission During Oconee License Renewal Process.Commissioners Must Remain Impartial During Pendency of Case.Copy of Order LBP-98-33 Encl.Served on 990107 ML20198Q8971998-12-17017 December 1998 Expresses Concerns Re License Renewal of Duke Energy,Oconee Nuclear Station,Units 1,2 & 3.Commends NRC on Steps Agency Has Undertaken to Conclude Renewal Process.With Certificate of Svc.Served on 990107 05000269/LER-1998-012, Forwards LER 98-012-01,re RB Spray Pumps Being Declared Inoperable Due to Npsh.Rept Has Been Revised to Indicate Results of Testing & Corrective Actions Taken to Date1998-12-0303 December 1998 Forwards LER 98-012-01,re RB Spray Pumps Being Declared Inoperable Due to Npsh.Rept Has Been Revised to Indicate Results of Testing & Corrective Actions Taken to Date 05000269/LER-1998-013, Forwards LER 98-013-00 Re Condition Prohibited by Ts,Per 10CFR50.73(a)(1)(d).Circumstances & Causes for Event Have Not Been Fully Determined & Will Be Provided in Supplemental LER on or Before 9812021998-11-0202 November 1998 Forwards LER 98-013-00 Re Condition Prohibited by Ts,Per 10CFR50.73(a)(1)(d).Circumstances & Causes for Event Have Not Been Fully Determined & Will Be Provided in Supplemental LER on or Before 981202 ML20155D2651998-10-23023 October 1998 Expresses Appreciation for Supporting Commission Initiative in Issuing Recent Statement of Policy on Conduct of Adjudicatory Proceedings.Case-specific Orders Were Issued in Calvert Cliffs & Oconee License Renewal Proceedings ML20155B1481998-10-21021 October 1998 Informs That as Result of Discussion of Issues Re Recent Events in Ice Condenser Industry,Ice Condenser Mini-Group (Icmg),Decided to Focus Efforts on Review & Potential Rev of Ice condenser-related TS in Order to Clarify Issues ML20154B9421998-09-30030 September 1998 Amends Chattooga River Watershed Coalition Petition to Intervene in Proceedings Re Application of Duke Energy Corp to Renew OLs for Oconee Nuclear Station,Units 1,2 & 3 ML20154A8971998-09-30030 September 1998 Requests That Submitted Info Be Attached to Amends to Petition to Intervene in Proceedings Re Application of Duke Energy Corp to Renew Operating Licenses for Units 1,2 & 3 ML20153H6881998-09-27027 September 1998 Requests Consideration of Motion to Enlarge Time Required to Submit Amended Petition to Intervene in Proceeding Re Application of Duke Energy Corp to Renew OLs for Facilities ML20153E4721998-09-24024 September 1998 Forwards Notices of Appearances for Attorneys Representing Duke Energy Corp,Applicant in Proceeding for License Renewal of Oconee Units 1,2 & 3.With Certificate of Svc ML20153D1831998-09-17017 September 1998 Ack Receipt of of Duke Energy Co Inviting Reconsideration of Denial by NRC CFO of Duke Exemption Request from Annual Fee Requirements for General License Under 10CFR171.11(d) ML20151S7501998-08-31031 August 1998 Provides Update on Commitment Made by Licensee in Response to NOV & Imposition of Civil Penalty Re Valves in Ldst Instrument Lines That Were Incorrectly Translated Into Station Procedures ML20237B0871998-08-11011 August 1998 Informs That NRC Plans to Administer Gfes of Written Operator Licensing Exam on 981007.Sample Registration Ltr Encl ML20236V9581998-07-27027 July 1998 Forwards Corrected Pages 3.5-30b of 961211 & 3.16-2 of 970205 TS Bases.Old Amend Numbers Were Left on Pages.Rev Changes Footer on Both Pages to Reflect Bases Changes ML20236P9451998-07-15015 July 1998 Forwards Emergency Response Data Sys Implementation Documents Including Data Point Library Updates for Oconee (Number 255),Dresden (Number 257) & Susquehanna (Number 258) ML20153D1961998-07-0909 July 1998 Requests NRC Reconsider & Grant Util Request for Exemption from Duplicative License Fee Under 10CFR171.11(d) for Storage of Spent Nuclear Fuel at Oconee Nuclear Station ML20236J9871998-06-24024 June 1998 First Final Response to FOIA Request for Documents.Documents Listed in App a Already Available in Pdr.Documents Listed in App B Being Released in Entirety ML20247G0881998-05-14014 May 1998 Provides Rev 2 to Section 3.3, Instrumentation, in Support of TS-362 Amend Request.Position on Testing of Analog Trip Type Instruments W/Regard to Transition from CTS to ITS, Restated.Summary Description of Its/Bases Changes,Encl 05000269/LER-1998-002, Forwards LER 98-002-01 Re non-isolable Weld Leak on Pressurizer Surge Line Drain Pipe Which Resulted in Unit Shutdown1998-04-30030 April 1998 Forwards LER 98-002-01 Re non-isolable Weld Leak on Pressurizer Surge Line Drain Pipe Which Resulted in Unit Shutdown ML20217G0351998-03-26026 March 1998 Submits Ltr to Update Commitment Made by Oconee in Response to Subject Violation.Update Assures That Details of Particular CA Are Appropriately Contained in Docketed Correspondence ML20203J9301998-02-26026 February 1998 Submits Response to NRC Bulletin 88-008, Thermal Stresses in Piping Connected to Rcs. Suppl 1 to Bulletin Attached & Contains Listed Commitments ML20199J7441998-02-0202 February 1998 Responds to NRC Bulletin 96-004 for NUHOMS-24P Sf Storage Sys Used at Plant Site.Nrc Reviewed Response & Found Response to Be Acceptable ML20198K9321998-01-13013 January 1998 Ack Receipt of Requesting Exemption from 10CFR171 for ISFSI License SNM-2503 & General License Provisions of 72.214 ML20198M9361998-01-12012 January 1998 Responds to Request That rept,BAW-2303P,rev 3 Be Considered Exempt from Mandatory Public Disclosure.Determined That Info Sought to Be Withheld Contains Proprietary Commercial Info & Will Be Withheld from Public Disclosure ML20203C8481997-12-10010 December 1997 Forwards Emergency Response Data Sys Implementation Documents for Plants.W/O Encl 05000269/LER-1997-003, Forwards LER 97-003-01 Re post-LOCA Boron Dilution Design Basis Not Being Met.Rept Includes Updated Info & Revised Corrective Action1997-11-12012 November 1997 Forwards LER 97-003-01 Re post-LOCA Boron Dilution Design Basis Not Being Met.Rept Includes Updated Info & Revised Corrective Action ML20198Q5741997-11-0303 November 1997 Provides Suppl to Initial 971020 Application for Amend to TS Re SG Tubing Surveillance Requirements,In Response to NRC 971030 Request for Addl Info.Proprietary Rev 3 to BAW-2303P, OTSG Repair Roll Qualification Rept Encl.Rept Withheld ML20211P1591997-10-17017 October 1997 Ack Receipt of & Check for $330,000 in Payment for Civil Penalty.Corrective Actions Will Be Examined During Future Insp ML20217D7261997-10-0101 October 1997 Informs That Staff Intends to Use Working Draft SRP-LR as Aid in Reviewing License Renewal Submittals Received from Dpc,Other Licensees & Owners Groups.Policy Issues Will Be Referred to Commission for Resolution ML20211F7981997-09-25025 September 1997 Submits Response to Violations Noted in Insp Repts 50-269/97-10,50-270/97-10 & 50-287/97-10 & Proposed Imposition of Civil Penalty in Amount of $330,000.Corrective Actions:Ldst Instrument Mods on All Three Units Completed ML20217D9341997-09-22022 September 1997 Informs That NRC Staff Has Accepted Deferral of Completion of Certain Actions Requested by Bulletin 96-03, Potential of Plugging of ECCS Strainers by Debris in Boiling Water Reactor ML20211C8021997-09-18018 September 1997 Forwards Revised TS Amend Re Reactor Bldg Structural Integrity.Previously Submitted TSs Contained Editorial Error ML20210T7121997-09-0404 September 1997 Informs That Representatives from Oconee Who Compose LERs Would Like to Meet W/Staff & AEOD at Convenient Place & Time to Facilitate Process.Concerns Addressed in Encl ML20216G5821997-09-0404 September 1997 Informs That 970730 Submittal Re Oconee Nuclear Station, Units 1,2 & 3 Will Be Marked Proprietary & Being Withheld Per 10CFR2.790(b)(5) & Section 103(b) of AEC Act of 1954 IR 05000269/19970071997-08-27027 August 1997 Discusses Insp Repts 50-269/97-07,50-270/97-07,50-287/97-07, 50-269/97-08,50-270/97-08 & 50-287/97-08 on 970606 & Forwards Notice of Violation & Proposed Imposition of Civil Penalty in Amount of $330,000 ML20210N1531997-08-13013 August 1997 Confirms 970807 Telcon Between J Burchfield & R Carroll Re Management Meeting to Be Conducted at Oconee Nuclear Station on 970922.Purpose of Meeting to Discuss Oconee Emergency Power Project Initiatives ML20210M8381997-08-13013 August 1997 Confirms Conversation Between J Burchfield & R Carroll on 970807 Re Mgt Meeting to Be Conducted in Region II Ofc on 971113.Meeting to Discuss Status of Plant Performance Improvement Initiatives ML20210N1121997-08-12012 August 1997 Informs That NRC Plans to Administer Generic Fundamentals Exam Section of Written Operator Licensing Exam on 971008. Facililty Must Submit Either Ltr Indicating No Candidates Scheduled to Participate or Listing Names of Candidates ML20149J4841997-07-21021 July 1997 Forwards Addl Pages to Rev 5 to Duke Power Co Nuclear Security & Contingency Plan. Encl Withheld 1999-08-10
[Table view] Category:EXTERNAL CORRESPONDENCE
MONTHYEARML19317E7781976-09-30030 September 1976 Summarizes Analysis & Rept of Possible Max Acceleration at Facility from Jocassee Reservoir Induced Seismicity ML19312C6091975-12-10010 December 1975 Summarizes Observations & Recommendations Resulting from Jocassee Hydro Consulting Board 751201 & 02 Meeting to Review Data Collected Since Previous Meeting & to Inspection Crack Along Upstream Face ML19317E7841975-08-15015 August 1975 Summarizes Discussions,Conclusions & Recommendations Resulting from Jocassee Hydro Consulting Board 750515 Meeting to Insp Data Re Settlement,Seepage Readings & Dam Performance ML19329A2671975-02-25025 February 1975 Notifies That Sc Wildlife & Marine Resources Dept Concerned W/Increase in Fish Impingement & Requests Preventive Measures Be Taken ML19308B2561974-02-0505 February 1974 Forwards 740123 Deposition of Fr Quis ML19322B9101973-06-18018 June 1973 Forwards Response to ASLB Subpoena Issued Per DOJ Request as Modified by ASLB 730108 Order & DOJ 730426 Ltr.Sh Smith Affidavit Encl ML19312C5731973-06-15015 June 1973 Forwards VEPCO Response to ASLB Subpoena.W/O Encl. Certificate of Svc Encl ML19317E7111973-03-0202 March 1973 Forwards Resolution Withdrawing City of Newton from Proceeding Before AEC ML19308B2591972-09-0505 September 1972 Forwards First Joint Request of Doj,Aec & Intervenors for Document Production by Applicant ML19329A4901972-02-28028 February 1972 Requests Addl Info Re Discharge of Wastes to Navigable Waters,Required for Preparation of NPDES Permit ML19329A4981972-02-24024 February 1972 Discusses Facility Effect on Dissolved Oxygen Concentrations in Lake Keowee.Drawings Encl ML19308B2111970-05-0606 May 1970 Ack Receipt of Info Re Environ Effects of Nuclear Power ML19312C5441967-09-0101 September 1967 Responds to Five Requests by Intervenors Re Purchase of Financial Interest in Proposed Plants.Denies All Requests 1976-09-30
[Table view] Category:EXTERNAL LETTERS ROUTED TO NRC
MONTHYEARML19317E7781976-09-30030 September 1976 Summarizes Analysis & Rept of Possible Max Acceleration at Facility from Jocassee Reservoir Induced Seismicity ML19312C6091975-12-10010 December 1975 Summarizes Observations & Recommendations Resulting from Jocassee Hydro Consulting Board 751201 & 02 Meeting to Review Data Collected Since Previous Meeting & to Inspection Crack Along Upstream Face ML19317E7841975-08-15015 August 1975 Summarizes Discussions,Conclusions & Recommendations Resulting from Jocassee Hydro Consulting Board 750515 Meeting to Insp Data Re Settlement,Seepage Readings & Dam Performance ML19329A2671975-02-25025 February 1975 Notifies That Sc Wildlife & Marine Resources Dept Concerned W/Increase in Fish Impingement & Requests Preventive Measures Be Taken ML19308B2561974-02-0505 February 1974 Forwards 740123 Deposition of Fr Quis ML19322B9101973-06-18018 June 1973 Forwards Response to ASLB Subpoena Issued Per DOJ Request as Modified by ASLB 730108 Order & DOJ 730426 Ltr.Sh Smith Affidavit Encl ML19312C5731973-06-15015 June 1973 Forwards VEPCO Response to ASLB Subpoena.W/O Encl. Certificate of Svc Encl ML19317E7111973-03-0202 March 1973 Forwards Resolution Withdrawing City of Newton from Proceeding Before AEC ML19308B2591972-09-0505 September 1972 Forwards First Joint Request of Doj,Aec & Intervenors for Document Production by Applicant ML19329A4901972-02-28028 February 1972 Requests Addl Info Re Discharge of Wastes to Navigable Waters,Required for Preparation of NPDES Permit ML19329A4981972-02-24024 February 1972 Discusses Facility Effect on Dissolved Oxygen Concentrations in Lake Keowee.Drawings Encl ML19308B2111970-05-0606 May 1970 Ack Receipt of Info Re Environ Effects of Nuclear Power ML19312C5441967-09-0101 September 1967 Responds to Five Requests by Intervenors Re Purchase of Financial Interest in Proposed Plants.Denies All Requests 1976-09-30
[Table view] |
Text
, y e, . - ,
Mr. L. C. Dail August 15, 1975 Duke Power Company C arlot e, t orth Carolina 28201 Do N
/off/
RE: Jocassee Hydro Consulting Board Meeting g_f g .
Fi1e No. J-4 ..
Dear Mr. DaII:
The Board met on Thursday, May 15, 1975 at the Jocassee si te. The dam and abutments were inspected. The data on settlement, seepage readings, and .
other aspects of dam performance were studied. The following summarizes our discussions, conclusions and recommendations:
- 1. Jocassee Embankment .
- a. Horizontal Movement of the embankment crest has been measured at surf ace monuments on the downstream f ace of the dam, 20 feet from the base line or about 3 feet below the theoretical crest.
Measurements by transit since June, 1973 have shown a maximum movement in a downstream direction of approximately 1.5 feet.
More accurate measurements by theodolite have shown a maximum downstream movement of 0.46 feet (at Sta.13+00) accumulated between July 12, 1974 and May 9, 1975. Movements at stations 11+00 and 15+00 (within the riverbed and the. highest reach of
'he dam) were 0.42 feet. It was noted that during the period when horizontal movement of surf ace monuments was made both by transit and theodolite that the movements were comparable. Also, these movements are of similar magnitude as on other ccmparable rock fill dams. As expected, there is a gradual decline in the rate of movement. ,
- b. Vertical Settlement of the embankment has been measured by three j
separate arrangements: Cross-arm devices (2) mainly in the core, 4
surf ace monuments (noted in a), and pins set for measurements across the crack at the upstream f ace (deflection devices, so- _
called). The following is a comparison of the settlement (in feet) . Column (1) is for the period 9-27-72 (start of highest cross-arm readings) to 7-1-73 (start of surf ace monument readings). Column (2) is for the period 7-1-73 to start of deflection device 18121809 7 3
Consulting Bo,1rd Report Page 2 readings (10-20-73 for Pin "L" and 1-10-74 for Pin "R") .
Column (3) is from start of deflection device readings to 7-12-74. Column (4) is from 7-12-74 to 5-9-75.
l (1) (2) (3) (4)
Device #1, Arm #23 (Sta. 7+00) 1.49 0.49 0.43 0.33 Defl . Device, Pin "R" (Sta. 7+03) -- --
0.15 0.22 Monument #3 (sta. 7+00) --
0.23 0.12 0.07 Device #6, Arm #29 (sta.15+90) 1.07 0.77 0.57 0.30 Defl . Device, Pin 'L" (sta. 15+50) -- --
0.27 0.18 Monument #7 (Sta. 15+00) --
0.20 0.23 0.15 1
0.26 0.16 Monument #8 (Sta. 17+00) --
0.31 Settienent as measured by these devices show a gradual reduction in the rate of settlement which is normal for rock fill dams,
- c. The Upstream Crack - Horizontal measurements across the upstream crack (between upstream and downstream deflection device pins) continue to increase. i t appears defini te, however, that this does not Indicate an upstream slippage of the shell, and that
~
such possibility is precluded by greater settlement of the core than of the shell . (in columns 3 and 4, para, b, tne settlement of Vertical Settlement devices #1 and #6 is greater than settle-ments of Pin "R" and Pin "L" respectively. The Monuments also experienced less settlemen t as compared to devices 1 and 6.)
~
Although the device pins are not referenced to a fixed line, it
- can be assumed with reasonable accuracy that the downstream pins j have moved downstream the same amount as the nearby crest monuments (para a) . Under this assumption, the upstream pins moved downstream
~
between 7-12-74 and 2-28-75 as fol lows : s ta. 9+00 - 0.15 f t. ,
Sta. 13+00 - 0.13 ft., Sta. 15+50 - 0.12 ft., sta. 17+00 - 0.11 ft. _
d it is believed that the attached sketch, with its notes, is a reasonable rationalization of the movement.
I 3
l l
Consulting Board Report Page'3 Downstresm movement of rock fill dams has been reported in the li terature and similar cracking has occurred. Information was found regarding Cherry Valley, Mud Mountain, Wautauga and South Hols ton in the USA plus Gepatsch in Austria - all center core dams; also, regarding the seven sloping core dams built in western North Carolina by Alcoa. Cracking was generally attributed to differential settlement between shell and core but, since no measurements of shell settlement were made, it is possible that this explanation given above for Jocassee is more real i s ti c. The settlement di f ferential might, however, have been greater at Jocassee than at the others as a result of compaction, by vibration, of the shell materials in Jocassee.
There has been no significant difficulty with any similar dams and the Jocassee movement, considering heights and designs, is consistent wi th them. Moreover, a stability check alcag an assumed circular slip surfaces in the upstream rock fill, coinciding with the crack near the crest surface, with its deepest point at Elev.1070 and assuming sudden drawdown to Elev.1080 shows a satisf actory safety f actor of about 1.31.
The Board concludes:
l
- i. Hovements of the embankment are not abnormal . Their causes and the changed geometry of the structure can be rationalized.
- 11. Apprehension regarding a serious slip in the embankment has been largely dissipated but continued moni toring of move-ments should be carried out as recommended below.
ill. The slope indicator readings are consistent with this conclusion, merely assuming the core of the dam as the '
moving mass and the upstream shell as stationary, or moving less, rather than the reverse.
- g. -
Consulting Board Report
.Page 4 The Board recommends:
I. The longitudinal crack should be repaired by regrading of the crest and/or filling with gravel / filter material.
ii. 4nstall permanent monuments upstream of the crack in the crest to take the place of the deflection device pins.
These monuments should be placed at stations 7+00, 9+00, 13+00 and 17+00.
- iii. Provide for frequent inspection of dam structure and abu tmen ts . These should be periodic Inspections by qualified personnel, inspections should also be made af ter severe storms and following a significant rapid drawdown of the reservoir.
iv. The following instrumentation should be observed at three
, month Intervals.
- 1) Vertical Settlement Devices i
l5 l{
'i
- 2) Surface Monuments
- a. Vertical Settlement
(.
- b. Horizontal Movement
{ 3) Slope Indicator Readings l These readings should also be scheduled af ter severe storm and significant rapid drawdowns of the reservoir.
I v. Judgment should be made af ter one year as to whether the instrument observation interval might be increased to six months. After 2 additional years, judgment should be made as to whether the observations might be discontinued altogether.
I Consulting Board Report Page 5
- 2. West Abutment.
The seepage as measured through the west abutment was observed to have decreased since January 1, 1975 Weir F reduced from approxi-mately 1200 GPM to '950 GPM, although the reservoir elevation during this period remained relatively constant. It was noted that seepage flow in other weirs registered increases af ter heavy rainfall, but Weir F did not respond to these rainfall events. There is a strong l
possibility of some seepage flow passing under the heavy rock fill between Weir F-1 and Wei r F; thus not being recorded at Weir F.
l It does not appear possible to monitor this possible diversion.
Also, other seepage may be passing under the dam directly to the downstream toe.
During this period of time, sorne of the observation wells in the west abutment (notable wells W-12 and W-18) have shown a considerable decrease. Well W-18 went from elevation 1081.2 on 1-2-75 to eleva-tion 1072.5 on 4-15-75 (The reservoir elevation was about the same for both dates.)
,. . The Board inspected the west abutment on the upstream side, with the reservoir elevation at 1100+; joints in the weathered rock may be i
potential seepage paths.
The Board recomends:
f! 1. Install a weir at a suitable location between Weirs F and F-1 to eliminate possibility of diversion of seepage into the rock fill ._ A good monitoring device, like Parshall flume, should be installed at uns point to facilitate continuous long-term monitoring.
- e
I l
Consulting Board Report Page 6
- 11. Re-establish observation.well W-6. .
111. Install an observation well between existing observation wells V-12 and W-13 on station -0+50.
Consideration should be given to grouting through the cracks ,
Iv.
in the bluf f rather than through drilled holes. Efforts
[
should be made by underwater inspection to locate rock joints or cracks in the bluff, which are responsible for seepage. This could be achieved by scuba diving up to about The diver should release 30 feet below the reservoir level.
dye near the face of the bluff by a squirt bottle and watch Joints to be for dye movement into the cracks or rock joints.
grouted can be identified by means of wooden pegs or steel pins.
If the above proves unsuccessful, the reservoir may then be lowered in one or two feet increments and the dye injected along the water line.
Two types of grout should be considered. Where a definite flow is observed, a sIIIcate grout, which sets up rapidly and becomes insoluble, should be used. For cracks in which there is no general suspicion of flow, but which might suggest Internal neat cement grout could be used.
connection wi thin the abutment, Grouting should be performed through barge-mounted equipment.
v.
At the next meeting of the Board, the lake level should be pulled down to permit a visual inspection of the cracks by boat.
- - Information-on underwater inspection should be made available at this time.
i i
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1 Consulting Board Meeting )
Page 7 l 3 The Board also inspected the recent erosion between intakes A and B.
Board recommends that fu.-ther erosion should be checked by building a concrete wall above the cleared ledge at elevation 1102+ and ;
backfilling with riprap.
- 4. The Board was informed that the pins installed on the rock face upstream of Jocassee powerhouse did not show any movement. Board does not see any need to continue this monitoring.
Yours very truly, l
(( /d 4. m em C. C. Cullum WF. V. Conn
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