ML20198F147
| ML20198F147 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 08/07/1997 |
| From: | Joseph Holonich NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Boger B NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9708110194 | |
| Download: ML20198F147 (50) | |
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t UNITED STATES S S NUCLEAR REGULATORY COMMISSION f WASHINGTON, D.C. 20655-0001 August 7, 1997 N
MEMORANDUM TO: Bruce Boger. Director Project Directorate Il-1 3 Division of Reactor Projects -1/11 Office of Nuclear Reactor Regulation FROM: Joseph J. Holonich. Chiefc=>. k Uranium Recovery Branch Division of Waste Management Office of Nuclear Material Safety
] and Safeguards O
SUBJECT:
ACTION ON DAM SAFETY AUDIT AT THE SHEARON HARRIS NUCLEAR POWER PLANT AUXILIARY RESERVOIR DAM. DOCKET NO. 50-400 The final report from the U.S. Nuclear Regulatory Commission's technical assistance contractor, the Federal Energy Regulatory Commission (FERC). was received and has now been evaluated. The audit was conducted on January 24, 1995.
Attached is a draft letter for use in transmitting the FERC report to the licensee, an Action List of NRC requested licensee actions, information relative to the National Inventory of Dams. three original copies of the FERC inspection report. dated June 30, 1995, containing the color photographs and a copy of an inspection video for the licensee's records. With respect to the three copies of the FERC report. we expect that one copy will be transmitted to the licensee. one copy to Central Files, and one copy to the Office of Nucleor Reactor Regulation (NRR) Projects. We will transmit an original copy to RII. along with a co)y of this letter. It is suggested that other necessary copies for NRR procedure requirements can be made by normal black and white copy machine, including only Xerox type copies of the photographs.
The conclusion of the audit was that there were no conditions observed that would indicate any immediate concerns regarding the integrity of the dam and the associated control facilities. The two items of most importance for licensee action are: (1) the removal of vegetal growth from various areas of the facility, and (2) the correction of surface drainage in certain locations /
to prevent erosive action on elements of the dam. In addition. FERC concluded that the dam should be categorized as a low hazard dam, thus verifying the previous NRC conclusion.
At the time of the audit, it was indicated that a copy of the data NRC provides to the Federal Emergency Management Agency for the National Inventor [y) of Dams would be transmitted to the licensee so that any errors or missing data could be provided to NRC by the licensee. A copy of that data is included with the transmittal package. A 60-day response time on the data review and update is requested.
CONTACT: D. Rom. NMSS (301) 415-6704 NO kOoN No!Noo PDR NRC FR.E CENTHICOPY G
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g B. Boger 2 As noted in the report, representatives of NRR and Ril accompanied the 01fice of Nuclear Material Safety and Safeguards and FERC personnel during this audit and participated in the discussions. Ril issued NRC Inspection Report No. 50-400/95-01 on this activity.
Attachments: As stated cc w/ Attachments:
V. Rooney, NRR G. Bagchi, NRR M. Shymlock, RII DISTRIBUTION:w\out FILE CENTER PUBLIC NMSS r/f URB r/f ACNW TLJohnson DGillen CAbrams MLayton MFederline DOCUMENT NAME: S:\DWM\ URB \DSR\HARISNRR.LTR OFC URB URBtiy 9 NAME DRom ON JHakch DATE 8/&/97 8/fo/97 0FF.CIAL RECORD COPY e
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i DRAFT LTR TO LICENSEE:
Mr. W. R. Robinson, Vice President Shearon Harris Nuclear Power Plant Carolina Power & Light Company Post Office Box 165 - Mail Codes Zone 1 New Hill, North Carolina 27562-0165
Dear Mr Robinson:
SUBJECT:
RESULTS OF DAM SAFETY AUDIT RELATED TO THE CATEGORY I AUXILIARY RESERVOIR DAM AT THE SHEARON HARRIS NUCLEAR POWER PLANT In January 24, 1995, an audit was conducted at the Shearon Harris Nuclear Power Plant of the Category 1 Auxiliary Dam. The NRC staff has received and evaluated the final report from its technical assistance contractor, the Federal Energy Regulatory Commission (FERC), related to this audit. Enclosure i contains a list of the actions that should be taken by you to insure the continued safety of the dam of Category I auxiliary reservoir 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 within 180 days of receipt of this letter, except as otherwise noted. It should be noted that since the NRC staff requested actions contained in Enclosure 1 are based on the information contained in the FERC report (Enclosure 4), no response to findings and v followup actions contained in the FERC report is required.
The conclusion of the audit was that there were no conditions observed that would indicate any immediate concerns regarding the integrity of the dam and associated control facilities. The two items of most importance are (1) the removal of vegetal growth from various areas of the facility and (2) the correction of surface drainage in certain locations to prevent erosive action on elements of the dam. Also an important observation was made regarding the data from the in-place piezometer monitoring instruments that youtshould also be aware of and may wish to consider in your future dam safety program.
Because the piezometers that are located in the impervious core portion of the dan all have tips at or near the foundation / core interface, data from these piezometers will most likely represent the higher of the water levels from the foundation or the core, but one cannot identify which is represented.
Consequently, it is not possible with the current installation to accurately measure the phreatic surface of the impervious core. In order to have such data, additional piezometers would have to be installed in the core and isolated from the natural foundation material.
As indicated at the time of the audit, copies of the data sheets provided by NRC to the Federal Emergency Management Agency (FEMA) and the Corps of Engineers are included as Enclosures 2 and 3 for review, corrections and additions. Within 60 days of receipt of this letter, it is requested that you review these data sheets and provide the staff any corrections or missing information.
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l As previously mentioned, an original copy of the FERC report, dated January 24, 1995, which contains color photographs taken of various area that were inspected during the audit, has been provided as Enclosure 4. As noted in the report, representatives of the Office of Nuclear Reactor Regulation and Region II accompanied the Office of Nuclear Material Safety and Safeguards and FERC personnel during this audit and participated in the discussions. Region II issued NRC Inspection Report No. 50-400/95-01, dated February 24, 1995, related to this audit.
Enclosure 5 is a copy of the video tape made during the inspection and it provides additional views of the various elements of the dam discussed in the FERC report. It may serve as a reference in the futu.e to the slow changes that sometimes occur with such facilities.
At the time of the audit it was noted by your cognizant personnel that the periodic 5-year dam inspection by a private consultant was due to be performed in calendar year 1995. Information from that inspection and evaluation as well as actions you have taken relative to the auxiliary dam may be of use in your response to this letter.
If you have any questions regarding the responses and information requested, the report, or schedule for submittal of information, please contact me at (301) 415-1458.
Sincerely, Ngoc B. Le, Project Manager Project Directorate II-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Office of Nuclear Reactor Regulation Docket No. 50-400 cc w/ Enclosures 1-4 See next page
Enclosures:
- 1. Licensee Actions Needed
- 2. Inventory of Dams
- 3. NATDAM Input Fields Definitions
- 4. FERC/NRC Operation Inspection Rpt
- 5. Video (20 minutes)
FILE:HarisLtr.513
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ENCLOSURE 2 o
i PAGE 1/3 NATDAM INVENTORY OF DAMS INVENTORY DATA 5/15/97 l SilEARON llARRIS AUXILIARY DAM NC-WAKE COUNTY DAM INFORMATION NATIONAL INVENTORY FIELDS
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- 1. DAM NAME................... SilEARON llARRIS AUXILI ARY DAM
- 2. OTIIER DAM NAMES............ CAT 1 EMERGENCY COOLING WATER
- 3. FEDERAL AGENCY 1D.......... NRCNC2
- 4. NATIONAL 1D................ NC83102
- 5. LATITUDE DEG............... 35 G. LATITUDE MIN............... 37
- 7. l.ATITUDE SEC............... 44
- 8. LONGITUDE DEG.............. 78
- 9. LONGITUDE MIN.............. 5 8
- 10. LONGITUDE SEC.............. 13
- 11. SECTION ,TOWNSilIP , RANGE. . . . .
- 12. COUNTY..................... WAKE
- 13. RIVER OR' STREAM . . . . . . . . . . . . TOM JACK
- 14. NEAREST CITY-TOWN.......... CARY
- 15. DISTANCE CITY-T0WN(MILE)........ 12 16.' OWNER NAME................. CAROLINA POWE3 & Light C0*
- 17. OWNER TYPE................. U
- 18. NONFED DAM ON FED PROP..... NO
- 19. DAM TYPE................... ER
- 80. PURPOSE.................... O-CAT I EMERGENCY COOLING WATER
- 21. YEAR COMPLETED............. 1979
- 22. DAM LENGTil (FT)............ 3900
- 23. DAM liEIGitT (FT)............ 50
- 24. STRUCTURAL llEIGilT (FT).....
- 25. IlYDRAULIC llEIGilT (FT)......
- 86. MAXIMUM DISCilARGE (CU FT).. 5030 .
- 27. MAXIMUM STORAGE (ACRE FT).. 7200
- 38. NORMAL STORAGE (ACRE FT)... 5000
- 29. SURFACE AREA (ACRES)....... 403
- 30. DRAINAGE AREA (SQ MILES)... 2.43
- 31. DOWNSTREAM RAZARD.......... LOW
, 32. EMERGENCY ACTION PLAN...... NR PIIASE I INSPECTION......... NO 33.
34.- INSPECTION DATE............
1/24/95
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- ' DAM-NAME: - 6flEARON 'ilARRIS AUXILI ARY DAM - INVENTORY DATA-PAGE 2/3 h COUNTY: WAKE ;
NATIONAL ID:-NCH3102 DAM INFORMATION NATIONAL INVENTORY FIELDS i
================
'35.- SPILLWAY TYPE.............. UNCONTitOLI.ED
- 36. ' SPILLWAY _ WIDTil (FT)........ 170 3 7. ' VOLUME OF' DAM.(CU YARDS)...
38.-4 NUMBER OF LOCKS............ 0 *
- 39. LENGTil O F LOC KS . . . . . . . . . . . . 0
- 40. WIDTil OF LOCKS (FT)........ 0
- 41. FED AGENCY INV FUNDING..... NO 4 2.- FED AGENCY INV DESIGN...... NO
- 43. FED AGENCY INV CONSTRUCTION NO
- 44. FED AGENCY INV REGULATORY.. YES
[ -45. FED AGENCY INV INSPECTION.. YES 46.
. FED AGENCY INV OPERATION... NO
.47. FED. AGENCY INV OWNER....... NO
- 48. FED AGENCY- INV OTilER. . . . . . . NO
- 49. FEDERAL REGULATORY AGENCY. . USNRC OWNElt INFORMATION
================
- 1. OWNER NAME. . . . . . . . . . . . , . . . . . CAROLINA POWEP & LIGHT COMPANY
- 2. OWNER TYPE. . . . . . . . . . . . . . . . . . ELECTRIC UTII ITY
- 3. CONTACT NAME................
-4. CONTACT TITLE...............
- 5. CONTACT SALUTATION..........
- 6. ADDRESS 1. . . . . . . . . . . . . . . . . . . . P.O. B0X 165-MAIL CODE: ZONE 1; NEW HILL, NC 27562-
'7. ADDRESS 2........................... 0165
- 8. ADDRESS 3....................
- 9. CITY...............'.........
- 10. STATE.................. . . . . . .
-11.-ZIP.........................
- 12. PHONE.......................
- 13. FAX.........................
- 14. ' EMERGENCY CONTACT -= NAME. . . . . . -
' 15 . EMERGENCY CONTACT PflONE.....
,- .16.; OWNER NOTE..................
- 17. DATE........................
e
w m DAM NAME:' _ SIIEARON HARRIS. AUXILIARY DAM INVENTORY-DATA-PAGE 3/3-7 -COUNTY:- NC' WAKE
-NATIONAL -ID:1- NC83102 INSPECTION'INFORMATI
==================ON
r 1.-' GENERAL CONDITION * *
- Inspection on 1/24/95 by NRC/FERC noted areas-
_where vegetation must be removed, erosion-in the groin and the toe regions from surface flow to be corrected, regrading for improveddrainage to--
be completed. The general condition of the-dam was very good. The owner has probably completed
-another inspection in 1995 by an independent con--
DAN-NOTE
, ======================______
sultant on the five year cycle.
1.
- 2. NOTE: RESEARCil COMPLETE (Y/N)***** ******************* *=========
Awaiting additional'information from the owner.
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ENCLOSURE 3 4
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3.3 THE NATDAM FIELD DEFINITION: FIVE PARTS There are forty.nine Selds included in the program for the update of the National Inventory of Dams.
The definition for each Seid consists of five parts:
o A feW msnbar indicating the order in which the data is to appear in the NATDAM database management fde.
o The feW isbel, indicating the standard name used fo: each field item.
For example, Latitude Dag.
o The Ask sype, including alphanumeric, number, or date, o The feW War indicating either a designated size or a variable size with a designated range, which will be supported in the National Inventory of Dams. Fields transmitted with a field size larger than that indicated in the dermition, will be truncated and data lost when the file is added to the national inventory.
o A desmpeos of abe fsW, standardikthe informatian traammitted ~
for individual data items. -
As indicated in the prenous d-amina of the NATDAM file structure, some flembility has been provided is field sizes and in the date format. la addsion, for a few fields, akernative data ent supported. If as skernative data catry preided, k wiB be designated within the field kom derm The skernative data entries will be converted to the standard form by FIDdA prior to incorporation int the National Inventory of Deess.
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l 3.4 LIST OF FIELD DEFINITIONS l g ne NATDAM forty.nine Geld Mm' ions' are as follows. The expresson included within parenthesis is used to indicate the type and size of the Seld. For example, the phrase,' Dam Name (Alphanumeric, 65 va)* dengnates an alphanumeric Seld and a variable Seld size, with a demanated range of 1 to 65.
l FIELD DEFINITIONS E
(1) Dam Name (Alphanumeric,65 var)
I Enter the official name of the dam. Do not abbreviate unless the abbreviation is a part of the official name. For dams that do not have an cfficial name, use the popular name.
(2) Other Dam Names (Alphanumeric,65 var)
Enter the reservoir name, followed by (res). Also,if there are names other than the official g name of the dam in common use, cater the names in this space. Separate the names using a semi-colon. Leave blank if not applicable.
I (3) Federal W' ID (Alphanumeric,15 var)
Enter the nnut agency iA.,iru ,ic.c number for the dam.
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- _ -,ta_,..a.-,d- - - -_m I. Darn Methosninar. $ sana Aanaer Mammal (19EFL W teses war. added to the Pedaral Amacr Mammal as a result of the ICODS W Moseang Neuember,1989.
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(4) Nedemal ID (Alphanumeric,7)
Enter the official nadonal identification number for the dam. 7Wr 1r a mparedfieht, ad meut Asw ei mieyfor w* den hcAuded h At NasimialI y of Dens.
The National ID is the Corps identlncetlos No assigned to each dam that was used on the 1981 National lawntory of Dams.
For those dams that were not included on the 1961 National laventory Of dams, an identification number will need to be generated. Each federal agency will be assigned a range of numbers that s
may be used to generate new National ID numbers. f ?)e ,wm yp ~/#. d e / / o-7 d tb .2,
- fyeerej .& e ora s&h e=ren d w g 7 Arf op iw y eby M c4w s ton )Maf s/a le,
< -o The first two characters of the identity will be the appropriate state two letter abbreviation, based on the location of the dam. The last five (5) characters of the identity will be a unique number in the agency's assigned range. See Figue 3 2, 1981 Nanonal inwntory of Dams, Corps Identificacion Numbers By State, for an example listing by state of Natu=al ID's used in the 1981 inventory.
Please contact the National Inventory Coordinator for the range of numbers asugned to your agency for the generation of NationalID numbers.
In some cases, it is anticipated that federal agencies will be assigning numbers to dams already added to the database by maanbr agen y. As such cases are hM. you will be notified and asked to adjust the National ID number as needed.
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4 (5) Ladende Das (Number,2)
(6) Ladsade MI: (Number,4 var)
(7) Lautode Sec (Number,2)
Latitude may be entered in one of two ways. The standard Geld entry gives latitude in l
degrees, minutes and seconds. An alternative 6 eld entry is prended for the convenience of If the those agencies who track latitude in degrees, minutes and tenths of a minute.
akercative form is used, FEMA will convert it to the standard form prior to inclusion in the national inventory.
Lautode Standard Entry: Enter Latituc e in degrees, minutes and seconds, using the three designated fields. For example, if the dam is located at lautude 38 deg,52 min.,30 sec.,
enter:
Latitude Deg: 38 Latitude Min: 52 Latitude See: 30 Lautode Alternative Entry: Enter the latitude in degrees minutes and tenths of a minute by entering: the dyuss value in latitude Deg; and the mesomer med sanshs afs mousse valu in Latitude Min. Transmit the Latitude Sec field as a blank Seld. For example,if the dun is located at latitude 38 des.,52.5 main, ester:
Latitude Deg: 38 tacitude Min: 52.5 Latitude Sec
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(8) Lasslands Dog (Number, 3)
(9) Lassitude Mia (Number,4 var)
(10) lassitude See (Number, 2)
E l longitude many be entered 's one of two ways. If the ahernative form is used, FEMA will convert it to the standard form prior to inclusion in the nanonal inventory.
Leasitude Standard Entry: Enter looptude in degrees, minutes and seconds, using the three deaagnated fields. For example, if the dam is located at longitude 82 deg,36 min,0 sec., enter:
I Lonprude Deg: 82 Longitude Min: 36 Longitude Sec 0 Leagitude Alternative Entry: Enter the longitude in degrees minutes and tenths of a minute by entering: the dayuer value in Longitude Deg; and the monumer ami asids of a mouse value in Longitude Min. Transmit the leaptude See field as a blank field. For example, if the dam is located at Lonytude 82 deg,36.0 min, enter:
Lonotude Dey 82 I Looptude Mia: 36.0 Longande Sec (11) Session, Township, Ramp Imcaties (Alphanumeric,30 var) nis is an optional field. If your age .y tracks the dam W by he*ia=, Township, and Rangs, please enter the information. Eater the inforunation la any form that is undsre==hhne and that clearly desagnates the indmdaal values. For czample, S.22, T.JN, R.dpW. If the meridian t=*tian is needed to locate the dam within the agency, include it in the 6 eld. For example, S.21 T 3N, R.68W of the Sink Principal Mendian.
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S (12) Ceesty (Alphanumeric,30 var)
Enter the name of the county in wWh the dam is located.
(13) her or Stream (Alphanumeric,30 var) l The River or Stream designation may be entered in one of two ways. An alternative field entry is pronded which is consistent with the ' tributary and offstream* designations used in the 1981 Nadonalinventory of Dams. If the alternative form is us d, FEMA will convert it to the standard form prior to inclusion in the national inventory.
River or Stream Standard Entry. Enter the official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributan to a named river, e.g, Snake TR. If the dam is located offstrcam, enter the name of the river or stream plus
- OS*,
e.g., Snake-OS.
ber or Stream Alternative Estry. Enter the official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributary to a named river, e.g.,
TR Snake, if the dam is located offstream, enter the name of the river or stream plus the word, "OFFSTREAM,' e.g., Snake OFFSTREAM.
(14) Nearest City Town (Alphanumed.e,30 var) t Enter the name of the nearest downstream city, town, or village that is most likely to be affeaed by floods resuking t' rom the failure of the dama.
h*== Nearest City Town (Miles) (Number,3 var)
(15)
Enter the dwan-e from the dam to the nearest downstream affected City Town Village, to the nearest mile.
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(16) Owner Name (Alphanumeric,50 var) l Enter the name of the owner of the dam.
(17) Owner Type (AJphanumeric,1)
Enter the cada to indicate the type of owner, F for Federal; S for Staae; L for Local Government; g U for Public Utilltr, or P for Privata.
(18) Nosfed Deae Os Fed Prop (Alphanumeric,1)
Enter the code indicating whether this dam is a non-federal dam located on federal propeny, Y for Yes; or N for No.
(19) Das Type (Alphanumeric,6 var)
Enter one or more of the following coder to indicate the type of dam, 5 mE for Eare; ER for RockSE; k PG for Gravkr, CB for Beatrues; VA for Ard; MV for Multi-Ard; CN for Concrete; n=a snnt t
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ST for Stooe; TC for Timber Crth; and/or OT for Other.
For example, the entry CNCB would indicate a concrete buttress dam type.
(20) Purposes (Alphanumeric,8 var)
Enter one or more of A fadioneng coder to indicate the purposes for which the reservoir is used:
I for Irrigaties; H for Hydroelectric; C for Flood Control And Storm Water Management; N for Navigatlos; S for Water Supply; R for Recneties; P for Fire Protection, Stock, Or Small Fana Pond, F for Fish And Wildlife Food; D for Debris Control; T for Taillegs; and/or ,
./ gf,,,'p..j o for other.
The order should indicate the sedanw W enporessee of the purpose. For example, SCR would indicate the primary purposes, Water Supply and Mood Coool And Storm Wate u nessment, folk =d by a, canon.
(21) Year Casspleted (Number,4)
Enter the year when the original main dam struaure was completed.
(22) Dean Length (Feso (Number,7 var) the length along the top of the Enter,in feet, the length of the dam, which is W as:
dam. This also includes the spillway, powerplant, navigation lock, fish pass, etc., w 18 4/1/91
! :s form part of the length of the dam 1f &m_M4 from the dam these structures should not be included.
Items 23 25: Dam Height Hydraulle Height, Structural Heisht Enter a corresponding value for the hight Geld (s) that most closely correspond to the ' Height of the Dam
- definition used by the agency. If the agency database coarmine values for more than one type of height, enter the value for each correspondag height Seld.
The height Geld (s) that do not presently correspond to agency data, may be left blank. This information should be added as it beci mes available for new dams.
(23) Dam Height (het) (Number,6 var)
E Enter, in feet, the height of the dam, which is deHaed as: the vertical dastase between the lowest point on the crest of the dam and the lowest point in the original streambed.
(24) Structural Heiskt West) (Number,6 var) 5 Enter, in feet, the structural height of the dam, which is defined as: the w.rtical distance from the lowest point of the excavated foundarian to the top of the dam.
(25) Hydrontle Height West) (Number,6 var)
Enter, in fact, the hydranik heigh 4 the dama, which is defined as: the vartical difference between the nazista dessa water level and the kmst point in the ongmal streambed.
(26) Mashmen IMecharge (Ca Ft/See) (Number,7 var)
Enter the number of cubic feet per second (cu ft/see) which :he spillway is capable of duchargas when the reservoir is at its :naximum designed water surface elevation.
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L (27) Maahnam Starage (Acre Feet) (Number,10 var)
Enter,in acte feet, the maximum storage, which is denned as: the total storage space in a reservoir below the maximum attainable water surface elevation, including any surcharge storage, (28) Normaal Storage (Acre Feet) (Number,10 var) the total storage space in a Enter, in acre fect, the normal storage, which is defined as:
reservoir below the normal retention level, including dead and inactive storage and excluding any flood control or surcharge storage.
(29) Surface Area (Aeres) (Number,0 var)
Enter,in acres, the surface area of the impoundment at its normal retention level.
(30) Dralange Area (Square Miles) (Number,10 var) the area that Enter, in square milca, the dramage area of the dam, which is c;eSned as:
drains to a particular point (in this case, the dam) on a river or stream.
(31) Downstream Haaned (Alpinnumerie,1)
Enter the code to indicate the potential hazard to the downstream area resukas from failure or mis-operation of the ha or fwamima L for Leer, S for Sipdesmat, or H for High, 4/1/91 I
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(32) ,
i Action Plan (Y/N/NR) (Alphanumeric, 2)
Enter the code, indicating whether this dam has an Emergency Acdon Plan (EAP) widch is defined as: a plan of action to be taken to reduce the patearial for property damage and loss of life in an area aNected by a dam failure or large Good. Leave blank if unknown.
Enter the code:
Y for Yes; N for No; or NR for Not Required. Enter the code NR if an EAP is not required for this dam under the agency requirements.
(33) Phase I laspection (Y/N) (Alphanumeric,1)
} Enter the code laAiming whether this dam was inspected in the Phase 11aspection Program,
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National Program of Inspection of Non-Federal Dams (P.I 92 367). Leave blank if unknown. Enter the code:
Y for Yes; N for No.
_ (34) Last Inspectice Dess (Date,11 var)
Enter the date when the most recent aspectics of the dam was perfonned. Enter the date, in one of the foDowing formats:
o la the form 31JUN87. 'Ibe month abbreviations supported by the FEMA database are:
JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC.
l o mm/dd/yy (06/31/87);
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l' o mm/dd/yyyy (06/31/1987); and
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o yyyyuundd (19870631), the form used by Dbene III fues.
If only the serpoman por is know, indicate the inspecdon date as the first day of th For example, inspections performed durin8 the year 1988 would be essered in the OUAN88.
If only the 6upscsien w eidyear are known, indicate the inspection date as the of the month. For czample, inspections conducted in March,1988 would be enter form 01 MAR 88.
(35) SpWway Type (Alphanumeric,1 var' Enter the one letter code that describes the type of spillway:
C for Controlled .
U for Uncontrolled N for None (36) Spaway Width (Feet) (Numeric,4 var)
Enter the width of the spiDway, to the nearest foot, availabic for discha at its mammum designed water surface elevation.
(37) Valene Of Dam (Cubic Yards) (Numeri(,12 var)
E tee the total numba of cubic yards occupied by the materials used in the ir . locks and spiDways, only if they are as integral part of the da lacinde portions of W and required for stremral sabany.
(38) Number Of Lecks -(Namenc,1)
Enter the number of saisdag navigation locks for the project. Mammum 22 -
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(39) Langsk d Locks (Feet) (Numeric,4)
Enter to the nearest foot the length of the primary navigation lock.
(40) Width d Locks (Feet) (Numeric,3)
Enter to the nearest foot the width of the primary navigation lock.
Items 41-48: Federal Agesty lavolvesment Fields Eight fields, #41448 are provuled to indicate federal agency lavolvement in a dam. At losst ant d the federal levam Solds ensat be deslanated as T. la order for the dam to be included la the National leventwy d Danma.
In 6 elds #41. d48, indicate agency involvement with respect to a dam, by entering the code:
Y for Yes; or N for No.
(41) Fed Aguacy lav Fundlag (Y/N) (Alphanumeric,1)
(42) Fed Agency lav Design (Y/N) (Alphanumeric,1)
(43) Fed Agency lav Construction (Y/N) (Alphanumeric,1)
(44) Fed Aguacy lav Regulatory (Y/N) (Alphanumeric,1)
(45) Fed Aguacy lav ImW (Y/M (Alphanumeric,1)
(46) Fed Assocy lav C, nM (Y/N) (Alphanumenc,1)
(47) Fed Assocy lav Owner (Y/N) (Alphanumeric,1)
(48) Fed Agamey lav Other (Y/N) (Alphanumeric,1) snm
d (49) Federal Aguacy Code (Alphanumeric,9)
Enter the Fedent Agency Code for each dam. nis is a regelred Geld, and must have an entry for each dam imeleded la the Natlesal levestery of Dams. I l
I 4
W i:
t ENCLOSURE 4 4
i l
OPERATION INSPECTION REPORT for THE NUCLEAR REGULATORY COMMISSION Inspection by THE FEDERAL ENERGY REGULATORY COMMISSION Atlanta Regional Office Date of inspection January 24, 1995 Dam (name) Auxiliary Reservoir Dam Location Harris Nuclear Station Waka North Carolina (Facility) (County) (State)
NRC Licensed Project Shearon Harris Nuclear Station Licensee Carolina Power and Licht Company (CP&L)
Features of the Dam and Impoundment Inspected Embankment. Spillway, and Reservoir Inspected by Robert L. Bryant Accompanied by Messrs. R. E. Shewmaker and Raman Pichumani (NRC-HO);
Joe Lenahan (NRC-RII); Bob Marler and Charles Smart (CP&L)
Weather clear, temoeratures in the mid 30s (0-4*C)
Summary Based on a review of project design documents,_ maintenance and instrumentation records, discussions with . NRC representatives and Carolina Power and 'ight Company (CP&L) employees, and observttions made during the inspection, no conditions were found that should be considered an immediate threat to the safety and permanence of the project structures. However, observations made during the field inspection revealed problems relating to undtsirable vegetation, erosion and poor downstream drainage. These conditions could lead to significant long-term safety problems if not corrected in due course of time. A complete list of recommendations is included in the text of the report.
Submitted
// [v 0Y f/l&
Robert L. Bryant, P.E.
y
Proiect Description The Shearon liarris flucioar Power Plant Auxiliary Reservoir Dam was constructed to provido an adequate sourco of emergency cooling water for the plant's reactor. The site is located on Tom Jack Crook approximately 16 miles (mi) (26 kilometers (km)} southwest of Raleigh, tiorth Carolina. Effluent from the dam's spillway discharges into the plant's main reservoir which is impounded by the main dam located downstream on Duckhorn Crock. Buckhorn Creek is a tributary of the Cape Fear River. 11ormal surface water clovation in the auxiliary reservoir is 252 foot (ft) {76.8 motors (m)}. Ilormal surface water elevation in the main reservoir is approximately 220 ft (67.3 m). The downstream toe of the Auxiliary dam is submerged in the waters of the main reservoir. The Auxiliary reservoir was constructed by building a dam across the flood plain of Tom Jack Creek, creating a lako of approximately 0.63 square miles (mi 2
) {1.6 square kilometers (km 2 )) at the base of a 2.43 mi2 (6.3 km2 ) watershed (drainage area). The principal structure consists of a random rockfill dam with an impervious core. The core is protected on each side by transition filters. A cutoff trench was excavated into the rock (siltstone) below the core. A grout curtain was injected into the foundation rock along the centerline of the dam. The rockfill was obtained from excavation of the spillway channel and local borrow areas and is primarily a clay shale. This clay shale weathers when exposed to the elements, but remains relatively unaffected when protected. Upstream and downstream slopes are protected by riprap in the areas potentially affected by wave action and by larger stones from the random rockfill in those areas not affected by wave action. A gravel surface road is located
3 along the crest of the dam. The road ends at either side of the spillway. There is no bridge across the spillway. Harris Nuclear Station is operated by CP&L. Figure 1 is a plan view of the dam and major features. Figure 2 provides cross section views of the spillway and dam.
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. TABLE 1 Pertinent Data Reservoir
-Drainage area ............................ 2.43 mi2 (6.3 km2)
Hormal water surf aco elovation . . . . . . . . . . . . . . . . 252.0 f t (76.8 m)
Surface area e el. 252.0 f t. (76.8 m) ....... 0.63 m12 . (1.6 km2 )
Volume 9 el. 252.0 f t. (76.8 m) . . . . . 5,000 acre-f t (6.17x10 6 3 m)
Maximum storm surcharge . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 0 f t (1. 8 m)
DAB Type ............................ Random rockfill with impervious core, designed for normal and seismic loadings.
Up s tr e a m s lope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 5 H 1V Downstream slope ....................................... 2.5H 1V Cre s t e le va t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260.0 f t (79.2 m)
Ma x imum h e i ght . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 f t (15.2 m)
Le ngth at cre st . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 9 0 0 f t ( 118 8 m)
W id th a t c re s t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 f t (6.1 m)
Slope protection- . . . . . . . . Riprap on upstream and downstream slopes spillway . . . . Uncontrolled, reinforced concrete over in-situ rock Length ..................................... 170 f t ( 51. 8 m)
Cre st e levat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 f t (76.8 m)
Downstream s lope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . 3 3 H t 1V N ATD AM N u mbe r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N C 0 h 10 2 Es s a r d P o t e n t i a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low NOTE: All elevations are mean sea level.
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a A. Refety of the ProjegA.
- 1. DABL Dikes, and Appurtenant Structures. The inspection team walked the crest and downstream toe of the Auxiliary dam, the i
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)3 abutments and accessible areas of the spillway. No conditions were !
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observed that should be considered an immediate threat to the safety ,
T and permanence of the project structures.
- a. Auxiliary Reservoir Dam. The upstream slope of the Auxiliary dam is protected by riprap (Photographs 1 -
3). No indications of movement of the upstream slope- such as sliding, I sloughing, or subsidence were observed. !
The crest and roadway along the top of the dam appearsd to be in good condition, with no indication of cracking, sliding, or subsidence (Photograph 2).
The downstream slope appeared to be in good condition (Photographs 10 & 11). The slope is protected by riprap at the lower levels where the slope meets the main reservoir water level (tailwater) and by large 1
stone from the random rockfill on the upper slope. Some indications of movement and/or subsidence of the riprap were observed near the s
juncture of the abutments and the toe of the downstream slope (Photographs 8 & 9). These areas appear to be the result '
f erosion o
along the toe of the dam. The erosion appears to have been caused by poor drainage that channels runoff from the abutment to the toe of the Auxiliary dam (Photographs 8 & 9).-
4 b. Spillway. The spillway is a reinforced concrete un-controlled overflow type structure located near the right (west) abutment (Photographs 16 -
21). Reinforced concrete abutment walls 4
extend into the reservoir and along the downstream slope into the ,
outlet channel. Overflow passes-through the spillway structure, down
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.an outlet channel and into the main reservoir. A buoy supported boat barrier is located upstream of the spillway wingwalls (Photograph 16).
The spillway, abutment walls, and outlet channel appeared to ba stable and in good condition.
- c. Abutmenta. The search for possible seepage areas along the intersection of the downstream toe and both abutments was adversely affected by standing water due to erosion and poor drainage ,
(Photographs 11 - 14) and by overgrown vegetation (Photographs 8, 9-12,-& 17) in the areas-downstream of the Auxiliary dam-toe. Areas-downstream of the toe along both abutments were found to be wet,
-probably from the recent snow malt, overgrown vegetation along the toe of the dam and the abutments needs to be removed and both abutments reworked (regraded and protected) to improve drainage, once the drainage is improved, eliminating standing surface water, the areas can be inspected for indications of seepage,
- d. Reservoir. Portions of-the reservoir shoreline were inspected -from the dam and abutments. No indications of active shoreline erosion or accumulations of floating trash or debris were observed.
- 2. Instrumentatipp]. - Project instrumentation includes surface monuments and piezometers. Monuments are located along the crest of L the - dam to monitor horizontal and vertical movement. Photograph 4 shows a typical-location of a survey reference point and piezometers with protective barriers. Piezometers are located along the crest of the dam and downstream of the toe. The piezometers-located along the crest measure pore pressures at or near the interface of the impervious
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c o r e -. a n d - f o u n d a t i o n . Readings from these piezometers will -likely represent. the water levels in the foundation or core, whichever is
higher. Accurate measurement of the Auxiliary dam embankment (core) phreatic surface will require installation of additional piezometers with screens (or slotted pipe) installed completely in the core and adequately isolated from the foundation. Monuments are surveyed and the results are recorded quarterly. An anomalous reading appeared in the monument deflection measurements made in 1985. Readings indicated higher than normal downstream deflection at monument AM-5. Subsequent readings have been consistent with previous data and compatible with readings made for other monuments. Possible explanations for the anomaly include survey error and/or damaged (disturbed) monument. - CP&L will continue to monitor this monument closely. Piezometer readings are also made and recorded quarterly. No other anomalies or changing trends were revealed by field observations or instrumentation data reviews made during the inspection.
- 3. Hazard Potential Classification. Since the Auxiliary dam is located on the headwaters of the main dam reservoir, failure of the Auxiliary dam would result in an increase of approximately 1.5 f t (0.46 m) in the level of the main reservoir. The increase is not considered ,
significant enough to upgrade the hazard classification. The Auxiliary dam is therefore cla~sificd as a Low" hazard dam. No condition
- were observed during this inspection tnat would warrant a change of classification.
- 4. Consultant's safety Insoection Report. Prior to 1990 (1981-1986), annual consultant's inspections were made by EBASCO. The first (and most recent) five-year independent consultant's inspection was made by Law Engineering Testing Company on December 18, 1990. The consultants found the project to be in good condition. No problems affecting the safety of the project were observed. The report noted
-10 the need for removal of vegetation from the riprap, some erosion of the west (right) abutment, some hairline cracks in the spillway walls and apron, and two areas of spalled concrete on the spillway walls. The next five-year independent consultant's inspection is scheduled for 1995.
- 5. Licennie's Inspection ProcraB. The following table summarizes the licensee's inspection program Inspection Frequency Performed By Last Inspection Visual Quarterly CP&L-llESS 01/04/95 Piezometers Quarterly CP&L-l!ESS 01/04/95 Monuments Quarterly CP&L-IIESS 12/19/94 operation / Safety 5-Year Consultant 12/18/90 HESS - Harris Engineering Support Section The inspection schedule appears to be appropriate for the project size and complexity.
B. operatioD and Maintenance. The project appeared to be effi-ciently operated and adequately maintained, with the exception of some drainage and erosion problems which will be discussed below. The reservoir level was approximately 252 feet (77.0 m) , at the spillway crest. Tailwater elevation (surface elevation of the main reservoir) was approximately 220 ft (V .3 m).
- 1. Dg33, Dikes, and Appurtenant structur.31 The upstream g riprap appeared to be in-good condit' ion. The riprap appeared to be relatively-free of vegetative growth. -Downstream slopes are protected by r i p r a p .' n e a r the waterline (main reservoir) and by large rock (segregated from the random rockfill) on the upper portion of the slope. There was evidence of some dormant vegetative growth in the riprap near the waterline.
l 11 The abutment areas immediately downstream of the dam were heavily overgrown with troos and brusht there were soveral areas of crosion, and areas of standing water. The natural ground slopes toward the too of the dam, channolling runof f toward the too, and resulting in erosion of materials from under the riprap at the too. Several areas were observed where the riprap appears to have settled following erosion of underlying materials.
- 2. 3Dillway Gates and Standby Power. The project has no spillway gates. The spillway is an uncontrolled, reinforced concrete structure. The flow passes over the spillway into an outlet channel.
The outlet channel directs water into the main reservoir. The right (west) spillway wall had a small area of spalled concrete at the construction joint above the crest. This spalled area appeared to be a small portion of a previously repaired area.
- 3. Power Plants. There is no hydro plant at this site. The pond is used to provide emergency cooling water for-the nuclear power plant.
- 4. Reservoir. Areas of the reservoir observed during this inspection appear to be clean and free of debris. No indications of erosion were observed. Operation and maintenance of the reservoir appear to be in accordance with good engineering practice.
- 5. Records. Design / construction /as-built drawings and opera-tion records are maintained by CP&L at the site. Summary design /
construction records are also maintained at the NRC-HQ of fices in Washington, D. C.
- 6. Emergency Action Plan. Since the auxiliary pond dam is classified as a " Low" hazar6 dam, no emergency action plan is required.
C. Environmental, Public Use. and Safety. No environmental, N
public use, or safety problems were noted during the it spection. The dam and reservoir are closed to the public. The area is fenced and j access road gates are lockod. A boat barrier supported by buoys is located upstreatn of the spillway (Photograph 16). 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. Findinas and Followup Actiona. The inspection team observed no conditions that might adversely affect the immediate safety of the project, however several conditions were observed that could lead to safety problems if left uncorrected. A meeting was held at the site on the morning of January 25, 1995 and the following observations and recommendations that FERC will make to NRC were discussed with NRC and CP&L representatives:
o A review of excerpts from the Final Safety Analysis Report (FSAR) 90-18 revealed that the Probable Maximum Precipitation-(PMP) for the Auxiliary dam drainage basin was based on outdated information. The FSAR noted that the PMP was 36.32 inches (in) {92.2 centimeters (cm)) based on a 36 hour4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> storm duration. A re"lew of the National Weather Service Hydrometeorological Report 52 revealed that the current chart for the all-season PMP for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and a 10 mi2 (25.9 km2 )
storm is approximately 41 in (104 cm) for the project site.
O Computerized instrumentation data plots for piezometers should '
include a to 5 years (or more)-of historical = data and should be scaled to readily identify trends and anomalies. Separate plots should be provided for monument deflection and settlement . data.- Horizontal and vertical (deflection and
l settlement) movement data should be amplified to show trends.
Data should be added to the plots on the rame frequency as they are collected.
o The piezometers located in the impervious core portion of the embankment all have tips based at or near the foundation / core interface. Readings taken from these piezometers will most likely represent the higher of the water levels from the foundation or the core. If it should become necessary to-accurately measure the phreatic surface of the impervious core, additional piezometers should be installed in the core and isolated from the foundation.
o As-built-drawings should be updated to accurately depict the location, depth, depth to seal, and slotted pipe depth range for piezometer 21A.
o Remove all vegetation from the riprap and crest road.
o Repair spalled concrete area at right (west) spillway abutment wall construction joint above the spillway crest.
o The abutments along the toe of the dam should be cleared of trees and brush, graded to drain, and protected from erosion.
E A toe ditch should be ins.alled to channel runoff away from the toe of the dam.
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Photograph No. 1 01/24/95 Upstream slope of dam as seen from near the left abutment. Noto undosirablo vegetation along the crest of the dam.
Photograph No. 2 01/24/95 Crest and upstream slope of the central portion of the dam.
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Photograph No. 3 01/24/95 Upstream alope showing the spillway and the right (west) abutment.
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'4 Photograph No. 4 01/24/95 Crest road, piezometers 5 & 12. monument AM9.
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,n4 Photograph No. 5 01/24/95 View downstream (main reservoir) from near left abutment.
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Photograph No. 5 01/24/95 Downstream view from near the center of the dam.
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Photograph No. 8 01/24/95 Toe of dam and left abutment. Note low area between toe and natural ground.
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l'hotograph No. 9 01/24/95 Eroded area under too at left abutment. Noto higher elevation of natural ground.
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Photograph No. 12 01/24/95 Downstream slope at right abutment. Note undesirable vegetation.
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Photograph No. 14 01/24/95 Erosion of right abutment near spillway.
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Photograph No. 16 01/24/95 View of spillway looking toward right abutment.
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Photograph No. 19 01/24/95 View of spillway from left abutment wall.
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Photograph No. 21 01/24/95 View of spillway from right abutment wall.
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Photograph No. 22 01/24/95 View of reservoir as seen from near the center of the dam.
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Photograph No. 23 01/24/95 View of reservoir as seen from the spillway right abutment wall.
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