ML20205A937

Forwards Evaluated & Final Rept from Ferc,Related to 981014 Dam Safety Audit Conducted at McGuire Nuclear Station for Category I Standby Service Water Pond Dam.List of Actions That Should Be Taken by Util to Ensure Safety of Dam,Encl

ML20205A937
Person / Time
Site:	McGuire, Mcguire
Issue date:	03/24/1999
From:	Rinaldi F NRC (Affiliation Not Assigned)
To:	Barron H DUKE POWER CO.
References
TAC-MA3823, TAC-MA3824, NUDOCS 9903310105
Download: ML20205A937 (25)

Text

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, March 24, 1999 Mr. H. B. Barron Vice President, McGuire Site Duke Energy Corporation 12700 Hagers Ferry Road Huntersville, NC 28078-8985

SUBJECT:

RESULTS OF DAM SAFETY AUDIT RELATED TO THE CATEGORY l l l STANDBY SERVICE WATER POND DAM AT THE McGUIRE NUCLEAR i STATION (TAC NOS. MA3823 AND MA3824)

Dear Mr. 3arron:

On October 14,1998, an audit was conducted at the McGuire Nuclear Station for the Category l Standby Service Water Pond Dam. The staff has received and evaluated the final report from the Federal Energy Regulatory Commission (FERC), related to this audit included in FERC's

. report (page 14) is a list of actions that should be taken by you to insure the continued safety of the subject dam, consistent with the Federal Guidelines for Dam Safety (1979) and the Dam Safety Program Act defined in the Water Resources Act of 1996. It is requested that you

- provide a written response to these actions by September 30,1999. This date was discussed with Mr. M. Cash of your staff, t  ;

! The conclusion of the audit was that there were no conditions observed that would indicate an l l

immediate or adverse threat to the safety and permanence of the project structures. However, there were two items (page 14 of FERC's report) identified that could lead to safety problems if left uncorrected. The action items relate to fire ant infestation and rutting on the downstream slope. A copy of the FERC report, dated February 24,1998, has been provided as an Enclosure.

If you have any questions regarding the responses and information requested, the report, or schedule for submittal of information, please contact me at (301) 415-1447.

Sincerely, ,

original siged by:

Frr.nk Rinaldi, Project Manager Project Directorate 11-2 g l Division of Licensing Project Management i Office of Nuclear Reactor Regulation f

ll Docket Nos. 50-369 and 50-370 DISTRIBUTION:

Docket File Hberkow ACRS GBagchi

Enclosure:

As stated PUBLIC PDil 2 RF Chawes Frina!di PSkinner, RGN 11 JHolonich y4g j cc w/ encl: See nt;xt page . JZwolinski OGC DRom ]

To receive a copy of this document, Indicate in the box: "C" = Copy without attachment / enclosure l "E" = Copy with attachtnant/ enclosure "N" = No copy I OFFICE PM:PDil-21 ) LA:PDil-2 l. D: PDM l l l l NAME FRinaldi:mWP CHawesf/DH HB'e W(v  !

, .iDATE- 3/3Jt/99 I $ /B/99 3/h/99 / /99 / /S9 ' / /97 DOCUMENT NAME: G:iMCGUIRE\MA3823.WPD OFFICIAL RECORD COPY )

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. 9903310105 WO324 PDR ADOCA 05000369 P PDR

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NUCLEAR REGULATORY COMMISSION

[ WASHINGTON. D.C. 20666-0001

8 March 24, 1999

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Mr. H. B. Barron Vice President, McGuire Site Duke Energy Corporation 12700 Hagers Ferry Road Huntersville, NC 28078-8985 l SUBJEC r: RESULTS OF DAM SAFETY AUDIT RELATED TO THE CATEGORY I l

STANDBY SERVICE WATER POND DAM AT THE McGUIRE NUCLEAR STATION (TAC NOS. MA3823 AND MA3824) l

Dear Mr. Barron:

l On October 14,1998, an audit was conducted at the McGuire Nuclear Station for the Category I

I Standby Service Water Pond Dam. The staff has received and evaluated the final report from the Federal Energy Regulatory Commission (FERC), related to this audit. Included in FERC's report (page 14) is a list of actions that should be taken by you to insure the continued safety of the subject dam, consistent with the Federal Guidelines for Dam Safety (1979) and the Dam

! Safety Program Act defined in the Water Resources Act of 1996. It is requested that you provide a written response to these actions by September 30,1999. This date was discussed l with Mr. M. Cash of your staff.

l

! The conclusion of the audit was that there were no conditions observed that would indicate an l

immediate or adverse threat to the safety and permanence of the project structures. However, there were two items (page 14 of FERC's report) identified that could lead to safety problems if left uncorrected. The action items relate to fire ant infestation and rutting on the downstream slope. A copy of the FERC report, dated February 24,1998, has been provided as an l

Enclosure.

If you have any questions regarding the responses and information requested, the report, or j schedule for submittal of information, please contact me at (301) 415-1447.

Sincerely, Frank Rinaldi, Project Manager Project Directorate 11-2 Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-369 and 50-370

Enclosure:

As stated cc w/ encl; See next page

a O i '

McGuire Nuclear Station cc:

l Ms. Lisa F. Vaughn Ms. Karen E. Long i Legal Department (PBO5E) Assistant Attomey General l Duke Energy Corporation North Carolina Department of l 422 South Church Street Justice Chadotte, North Carolina 28201-1006 P. O. Box 629 Raleigh, North Carolina 27602 County Manager of Mecklenburg County L. A. Keller 1 720 East Fourth Street Manager- Nuclear Regulatory i Charlotte, North Carolina 28202 Ucensing Duke Energy Corporation Michael T. Cash 526 South Church Street Regulatory Compliance Manager Charlotte, North Carolina 28201-1006 l Duke Energy Corporation McGuire Nuclear Site Elaine Wathen, Lead REP Planner

12700 Hagers Ferry Road Division of Emergency Management L Huntersville, North Carolina 28078 116 West Jones Street Raleigh, North Carolina 27603-1335 J. Michael McGarry, Ill, Esquire

, Winston and Strawn Mr. Richard M. Fry, Director l 1400 L Street, NW. Division of Radiation Protection Washington, DC 20005 North Carolina Department of Environment, Health and Natural Senior Resident inspector Resources c/o U.S. Nuclear Regulatory Commission 3825 Barrett Drive 12700 Hagers Ferry Road Raleigh, North Carolina 27609-7721 Huntersville, North Carolina 28078 Mr. T. Richard Puryear Dr. John M. Barry Owners Group (NCEMC)

Mecklenberg County Duke Energy Corporation j Department of Environmental 4800 Concord Road Protection York, South Carolina 29745 700 N. Tryon Street Charlotte, North Carolina 28202 ,

Mr. Steven P. Shaver I

Senior Sales Engineer l

Westinshouse Electric Company

5929 Camogie Blvd.

Suite 500 Charlotte, North Carolina 28209 l

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OPERATION INSPECTION REPORT ,

for THE NUCLEAR REGULATORY CONNI8810N Inspection by THE FEDERAL ENERGY REGULATORY COMMI881uN Atlanta Regional Office Date of inspection October 14. 1998 Dam (name) Standby Nuclear Service Water Pond Dan Location McGuire Nuclear Station Mecklenburg North Carolina (Facility) (County) (8 tate)

NRC Licensed Project William B. McGuire Nuclear Station Licensee Duke Power Features of the Dam and Impoundment Inspected Embankment. Snillway. ~ ~

Reservoir. and Outlet channela Inspected by Robert L. Bryant Accompanied by Messrs. Daniel Rom (NRC-HO) and Mark Hunt (Duke Power)

Weather clear, temperature approvinately 70'F ( 21*c)

Summary Based on a review of available records, observations made during j the inspection, and discussions with NRC representatives and licensee i employees, no conditions were found that might be considered an immediate threat to the safety and permanence of the project structures. However, several maintenance recommendations were made.

Recommendations' include a fire ant eradication program and continued maintenance'and repair of damage to the grassed embankment caused by mowers.

Following are a project description, pertinent data sheet, project location map, site plan, and cross section of the dam. A photograph location map precedes the photographs attached to the report.

FEB 241999 Submitted

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bbert 'L.~ Bryant, P.E.

Enclosur-

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Preiset namerintion The McGuire Nuclear Station Standby Nuclear Service Water (SNSW) pond dan was constructed to provide an adequate supply of water to dissipate . waste heat rejected during a reactor unit loss of cooling j 1

accident and/or unit'cooldown. The project is located approximately 17 miles (27 km) north-northwest of Charlotte, North Carolina. The site 4

is about 0.75 miles (1.2 km) east of the Catawba River and Cowans Ford dam. Water supply for the pond is provided by rainfall and/or conduit from Lake Norman (Cowans Ford reservoir). Overflow and seepage from the SNSW pond discharges into a wastewater pond immediately downstream of the dam. Overflow from the wastewater pond discharges into the l

Catawba River downstream of the Cowans Ford dam. McGuire Nuclear Station is operated by Duke Power.

The SNSW pond was constructed by building a dam across a narrow valley, creating a lake with a 35 acre surface area. The principal structures consist of a homogeneous earth fill dam (The earth fill is .

f' generally classified as silty or MH material), drop inlet type spillway, cooling water intake, and inflow / recharge system. An entrance road to the nuclear plant follows the crest of the dam.

A railroad is supported by a born across the downstream face of the

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3 dam. Table 1 lists the pertinent statistical data for the dam.

.1 Figure 1 shows the location of the project. Figure 2 is a plan view of l the dam and major features. Figure 3 is a cross section view of the dam at its maximum height. Figure 4 shows the locations of photographs f taken during.the inspection.

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j Dam Type ........................... Homogeneous compacted earth fill Length ............................................. 1260 feet i Maximum height ....................................... 60 feet

! Crest width .......................................... 36 feet j Crest elevation ................................... 747.0 feet

Parapet wall elevation ............................ 748.5 feet Railroad barn width .................................. 31 feet j Slopes

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l Upstream: (

j Above elevation 740 feet ...................... 1.5H:1V Below elevation 740 feet ......... .............. 2.5H:1V Downstream:

Above railroad bara ............................ 2.0H:1V l

Below railroad berm ............................. 2.5H:1V ,

! NOTE: Railroad barn elevation varies. l I

i i spillway Type ............................ Relaforced concrete drop inlet l 6 by 6.67 feet

Inlet size ....................................

i crest elevation ..................................... 740 feet l Outlet pipe:

l Type ............................... 0.375 inch steel wall i Diameter ........................................ 4.5 feet j Length .......................................... 225 feet Reservoirs Drainage area ...................................... 171 acres i Normal pool elevation ............................. 740.0 feet i Surface area ...................................... 34.9 acres Volume .......................................... 578 acre-feet

! Usable VoluBe .................................. 566 acre-feet Estimated annual rainfall inflow ............... 272 acro-feet

! Estimated annual surface evaporation ............ 165 acre-feet

! Maximum storm surcharge ............................... 2.5 feet l Location ................... 35'25'44"N Latitude, 80'56'48"W Longitude I

!' Essard Potential Classification ................................. Low

$ NATDAM No. .................................................. NC83101

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NOTE: All elevations are mean sea level.

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A. safety of the Proiset.

1. name, nikes. and Appurtenant structures. All accessible areas of the dam, abutments, and spillway were inspected by walking. No conditions were observed that might be considered an immediate threat to the safety and permanence of the project structures.

a. standby Nuclear service Water Pond nam. The upstream slope of the dam is protected by 250 to 750 pound dumped rock (Photograph 1) . The rock (riprap) surface created by dumping is very irregular and makes it difficult to detect any indication of supporting soil movement such as sliding, sloughing, or subsidence.

As-built drawings for the dam's upstream slope show a 1 foot thickness of crusher run filter stone under a 2 foot thickness of 3 to 24 inch stone bedding material for the riprap. The purpose of the bedding material is to prevent erosion by providing a filter between the riprap and the earth dam. The drawings show the upper surface of the bodding material near the top of the parapet wall. Field observations made by' the Federal Energy Regulatory commission (FERC) inspectors in November 1994, found the top of the bedding mater 2 a1 to be 2 to 3 feet below the top of the parapet wall. Either the material was initially placed at that level or some " beaching" or sloughing of the bedding material has occurred as the result of wave action. Washing out of the bedding / filter material removes the protection between the earth dam and the riprap and can expose the earth fill to the forces of erosion. The

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current FERC inspection found the condition of the bedding materials along the parapet wall to be essentially unchanged from conditions observed during the previous inspection. However, the licensee should continue to monitor this condition for signs of movement in the bedding material or erosion of the earth fill.

The roadway and concrete parapet wall (Photograph 2) along the crest of the dam appeared to be in good condition. There were no indications of cracking or settlement in the asphaltic concrete of the roadway surface. The concrete parapet wall had some minor surface cracking and some signs of weathering. The construction joint in the wall near the left abutment (Photograph 3) appears Movement at this unchanged from the previous FERC inspection.

joint is monitored through surface monuments on either side of the joint. An earth bara (Photograph 2) extends from the north and of the parapet vall to the right abutment.

The downstream slope of the dan has an established grass cover l

- over the complete surface of the downstream slope, with the exception of some ruts from mowing equipment and one small area (Photograph 6) near the top of the dam and the left abutment.

There were no indications of slides, settlement, or sloughing along the downstream slope. No wet areas were observed along the contact with the abutments o'r in the flat area immediately downstream of the toe of the dam. Several days of dry weather prior to the inspection were helpful in drying up surface runoff. The dry weather makes detection of seepage easier, but no wet spots were found.

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! in the trees between the dan and spillway channel (Photograph 11)

' has been trenched to improve drainage and stabilized (covered) with i

$ riprap. The source of the water.has not been determined; however, the area appeared to be stable. ,

i i Another wet area found on the previous FERC inspection was i

located to the-left of the spillway outlet channel. The current

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inspection found this area to be dry, indicating that the previous wet conditions were likely due to rainfall / runoff.

Effluent from the toe drain (Photograph 9) was clear and the volume of flow appenrod to be consistant with flows recorded in the historical data. The weir (Photograph 10) downstream of the toe drain outlet also appeared to be in good condition and operating normally.

b. spillway. The spillway (Photograph 1) is a )

reinforced concrete drop structure with a crest elevation fixed at l 740.0 feet. The spillway is located near the dam and right abutment. The overflow passes into the spillway, into a horizontal steel pipe and is conducted away from the dam along a concrete l lined outlet channel (Photographs 11, 12, and 13). All components of the spillway appeared to be in good condition.

c. Abutments. The upstream abutments are protected by riprap from below the normal pool level to the top of the dam. The downstream abut.ments are protected by a well established grass cover. Inspection of the abutments revealed no indication of seepage. The slopes appeared to be stable.

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d. Reservoir. Some erosion was apparent on the steeper slopes of the reservoir. However, the erosion appears to have reached a state of equilibrium and does not appear to be progressing. No trash or debris was observed in the reservoir.

The outlet for the recharge water from Lake Norman is located on the north side of the reservoir. The two outlet pipes are housed in a concrete bulkhead and are located completely below the normal water surface. The bulkhead was inspected and found to be in good condition. The intake for the nuclear service water is located near the center of the reservoir and is completely submerged.

2. Instrumentation. Projuct instrumentation includes surface monuments, observation wells, piezometers, and a weir. l Surface monuments are located along the concrete parapet wall and along the railroad bara on the downstream slope of the dam. The surface monuments are surveyed annually to monitor vertical and horizontal movement. Foundation piezometers and observation wells are located on the downstream slope. A V-notch weir is located ,

downstream of the drain outlet structure to monitor the volume of flow through the drain system. Piezometer, observation well, and l weir readings are made quarterly. A review of the available instrumentation data revealed no anomaly or unusual trend.

3. manard Potential Classifiention. The SNSW pond dan is classified as havir.j a " Low" hazard potential, based on the potential for downstream property damage, adverse environmental impact, and loss of life due to failure of the dam. The only c___m._.____..___m_____m ___m__.__-_-m_exeernemee.ee___ ar wregr- ne a p -ww.,ww,. m., c.-.m ,

-11 structure downrtream of the dan that would be affected is a 1

wastewater pond. Flow from a breach of the SNSW pond dam would l flow through the wastewater pond and into the Catawba River. No conditions were observed during the inspection that would warrant a change of hazard potential classification.

4. consultant's safety inspection menort. Although this is not a FERC licensed project, it is noted here that FERC does not require a consultant's safety inspection on projects classified as having a " Low" hazard potential.

An independent consultant's safety inspection was made by Trigon Engineering Consultants, Inc., of Charlotte, North Carolina, on July 17, 1990. The report was dated August 30, 1990. The 1

report found the project to be in good condition and maintenance j 4

procedures to be adequate.

5. Licensee's Inspection Program. The following table i l

summarizes the licensee's inspection program:  !

Inspection Frequency By Date visual Quarterly DPC-EMG -

Pond Elevation Quarterly DPC -

Piezometers/ Wells Quarterly DPC -

Seepage Quarterly DPC -

Monuments Annually DPC 09/23/98 1

Engineering Annually DPC 05/11/98 DPC - Duke Power Company ENG - Environmental Monitoring Group 4.

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a The inspection schedule appears to be appropriate for the project size and complexity.

3. Operation and Maintenance. The project appeared to be efficiently operated and well maintained. At the time of the inspection, the pond level was slightly below the spillway crest elevation of 740.0 feet, 4.llowing visual inspection of the spillway structures.

1. Damm. Dikes, and Annurtenant structures. The upstream slope of the dam has a riprap cover from below the water lise to the concrete parapet wall along the upstream side of the crest. The riprap appears stable and generally provides good coverage of the earth slope. However, the area near the top of the slope appears to have stone bedding materials placed lower than specified on the as-built drawings. This area does not appear to have changed since the previous FERC inspection in November 1994.

However, the licensee should continue to monitor the area to detect any changes in the position of the riprap or erosion of the earthfill. The downstream slope has a well established grass

. cover, but some rutting from the movers and one bare spot near the

, left abutment (Photograph 6). The licensee should continue to monitor these areas and make repairs as required.

I 2. Spillway cates and stanaby Power. This project has no spillway gates; therefore standby power is not required.

3. Power Plants. There is no hydroelectric plant at

! this site. The pond is used for standby cooling water for the I

nuclear power plant.

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. . 4. Reservoir. The reservoir appeared to be clean and free of floating debris. Eroded areas on the shoreline appear to have stabilized. Operation and maintenance of the reservoir appear to be in accordance with good engineering practice.  !

5. Records. As-built drawings and records required for operation of the project are maintained by the licensee at the site. Design / construction documents are also maintained by the NRC at its headquarters in Washington, DC.

s. Emergency Action Plan. Since no reasonably forseeable project emergency would endanger life, health, or property, an emergency action p1...t does not need to be prepared.

c. Environmental. Public Use. and safety. Public access to the pond is permitted. A boat launch area is located on the north I side of the pond. Public safety devices include warning signs posted to prohibit fishing from the dam. No environmental, public use, or safety problems were observed during the inspection.

Existing public safety devices appear adequate and are properly maintained. No additional actions to protect life and property were required as a result of the inspection.

D. Findings and followup hetions. No conditions were observed that might adversely affect the immediate safety and permanence of the project structures. A meeting was held at the site on the afternoon of October 14, 1998, and the following observations and recommendations were discussed with NRC and DPC representatives:

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o Several colonies of fire ants were found on the dam. l These pesta can dig burrows as deep as 4 feet and lateral foraging tunnels as long as 8 feet. The licenses should j initiate an eradication program and include de.tection of fire ants as a part of the regular inspection program, o The grass cover on the downstream slope continues to be disturbed by mowers making ruts. There was also one  !

l small bare spot on the slope. The licenses should I

continue to monitor these conditions and make repairs as i

necessary. Alternative methods of moving the slopes should be investigated.

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'll l i Photograph 1 10/14/98 Spillway and upstream riprap as seen from the upstream right abutment. Note the new metal grate walkway around the spillway cage.

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Photograph 2 10/14/98 Top of the dam showing the riprap, parapet wall, and crest road. Note the berm at the end of the parapet wall. The berm extends to the right abutment.

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Joint in parapet wall near the left abutment. l Movement of the wall is monitored on either side of the joint.

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l Photograph 4 10/14/98 View of the upstream slope and riprap as seen from the left abutment. The riprap was dumped in place and forms an uneven slope.

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l Photograph 5 10/14/98 Railroad berm and downstream slope of the dam as seen from near the left abutment. Note the well established grass cover on the slope.

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-i Photograph 7 10/14/98 View of the downstream slope from near the right abutment. Note the good condition of the grass cover, new riprap in drainage trench.

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Piezometers DP-6 and observation well DW-6 on the i downstream slope. The instrument locations are marked by orange poles to prevent mower damage.

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Photograph 9 10/14/98 Toe drain outlet structure at the downstream toe of the dam.

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I h6 9 i Photograph 10 10/14/98 V-notch weir downstream of the toe drain outlet structure.

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Photograph 11 10/14/98 Concrete lined spillway outlet channel looking toward the dam.

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Photograph 12 10/14/98 Concrete lined spillway channel, concrete headwall and outlet pipe as seen from the downstream side of the headwall.

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