ML20198H770
| ML20198H770 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 08/21/1997 |
| From: | Gotzmer J FEDERAL ENERGY REGULATORY COMMISSION |
| To: | Joseph Holonich NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20198H706 | List: |
| References | |
| NUDOCS 9801130391 | |
| Download: ML20198H770 (44) | |
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FEDERAL ENERGY REGULATORY COMMISSION ATLANTA REGIONAL OFFICE Parkridge 85 North Building 3125 Presidential Parkway. Suite 300 Atlants, Georgia 30340 (770)452 2360 AUG 211997 Standby Nuclear Service Water Pond Dam Catawba Nuclear Station Mr. Joseph J. llolonich, Chief Uranium Recovery Dranch Division of Wasto Management Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory commission Washington, D.C.
20555-0001 i
Dear Mr. llolonich As requested in your August 4, 1997, letter we are forwarding throo copics of the final version of the operation inspection report for the Standby Nuclear Servico ihter Pond Dam at the Catawba Nuclear Station. We havo modified the draft report in 1
accordance with your request to reflect the fact that the dwolling originally located at the left downstream too of the dam was removod subsequent to the inspection conducted in February 1997.
As a result of this action, the dam is now considered to have a
" Low" hazard potential.
The fivo recommendations included in tho draft report for improving maintenance and operation of the dam are still considered appropriato.
We approciate the opportunity to assist you with your dam saf ety program.
If there are questions regarding this repote, please contact Mr. Jason J.
Chen of this office at 770/452-2363, extension 25.
Sincerely, M
Jerrold W. Gatzmer, P.E.
Acting Director Enclosure 9901130391 970821 ADOCK 0 % g3 PDR 0
OPERATION INSPECTION REPORT for THE NUCLEAR REGULATORY COMMISSION Inspection by FEDERAL ENERGY REGULATORY CORMISSION Atlanta Regional Office Date of inspection February 26. 1997 Dam (name) _. Standby _lluclear_Sgrvice Water Pond _1SNSWP)
Location _ Catawba _Hucigar Station York South Carolina (County)
(State)
NRC Licensed Project _ Catawba Nuclear Station Licensee _DMke Power __Csraany r+.htures of the Dam and Impoundment Inspected and Embankment.
kd Mt_. Structure. Instrument Pier, and immediate vicini_ ties Inspented by _lason J.
Chen Weather _ Cloudy._and_ Warm 5 5'r Accompanied by Mensrs.
P.
Tam and D.
Rom (NRC-hoi; W.
Shoemaker add C.
Ey of Duke Power Company Bummary Dased on observations during the field inspection; review of design documents, maintenance
- records, and instrumentation monitoring data; and discussions with NRC representatives and Duke Power Company (Duke) employees, structural features of the SNSWP dam and appurtenant structures appear to be in satisfactory condition and adequately maintained.
No conditions were observed which should impair the immediate safety and permanence of the development works.
Inspection and maintenance related recommen-dations were provided as a result of this inspection.
A list of these recommendations is included in the text of the report.
At the time of the inspection, SNSWP level was at elevation 574.2 feet mal and Lake Wylie level at elevation 567.7 feet msl.
An engineering data sheet, a project location cap, and plan and sectional views of the project structures follow.
'AUG 211997 submitted h
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___., 2 - 4 Catawba Nweear Staden APPendis 2 Chaptw 2 Tables and lig:res i
Table 2 M. Standby Nuc4 ear Sonice Wata Pond f
Pertinent pond and dam features are tabulated in this table, f
i Pond 410 acres Drainage area at the dam Water sudace elevation, normal full pond 571.0 md j
10.3 ft Maximum storm surcharge 8 46 acres Sudace area, water sudace at elevation 571.0 Volume, water sudace at elevation 571.0 560 acre h Uuble volume, between elevation $42.75 (SNSW intake)
.560 acre h i
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and elevation 571.0 l
160 acre h Estimated average annual sudace evaporation 464 acre ft Estimated average annual inflow 3650 cis
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42 inches per year f
Evaporationlosses average i
Evaporationlotus maximum 50 inches per year Maximum drawdown elevation LOCA conditions
$67.0 mil Volume at matimum drawdown elevation 390 acre ft Dam l
Compacted Earth Fill. Group i e
Designed for normal and wistruc loadings 595.0 md Crest elevation 75 ft Maximum height 1710A l
length of cnst 35 ft Width of cnst Frnboard, maximum flood level on (Ac W)he side 2.8 ft Maaimum hurricane waves 4th IMe Wybe at full pond 4.5 ft elevation Stone Riprap Slope protection T
e 8 Discharge et maximum storm surcharge 380 cfs -
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T)pical Section. Standby Nuclesr Service Water Pond Dam
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All accessible areas of the SNSWP structures were inspected on February 26, 1997.
No conditions were identified that represent an immediate danger to the safety and permanence of the projects works.
- 1. Dam....Dikast and_ Appurtenant structures The SHSWP was constructed by closing a natural cove of Lake Wylie with an earth dam.
The SNSWP providos emorgency cooling water for the nuclear units at the Catawba Nuclear station.
The SNSWP dam is a 1,710-foot-long earth fill structure with a maximum height of 75 feet.
The differential head between the upstream SNSWP and the downstream Lake Wylie is only 6 to 7 foot.
No utility lines or tunnels are reportedly located within or beneath the dam.
A concrete outlet structure and an instrument pier are located at the right abutment.
a.
SliEMP_ Dam.
The dam is an carth fill embankment structure and was found to be in a stable condition.
No signs of significant distress were observed such as sliding, sloughing, settling, or other movements on either the downstream or upstream faces.
Photograph 1 presents an overall upstream view, looking from the left end.
The upstrer.n slope, as well as the top and the downstream slope, are protected from erosion by dumped riprap stones.
The photograph shows riprap stones with different colors, an indication the materials como from different sources.
Photograph shows the crest of the dam.
Roadbod-sizo crushed stone material was placed over the-riprap stones for traffic purposes.-
No cracks or settlement were observed on the crest.
Photograph 3 presents an upstream view of the left portion of
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-a-the dam.
Photograph 4 shows a road from the left end of the crest turning to the downstream too for access to a
boat ramp (Photograph 5).
Photograph 6 presents a view of the downstream slope, looking toward the right abutment.
No depressions were observed on the surface of the riprapped slope.
Photograph 7 presents a view of the left portion of the downstream slope.
Seepage was observed from the middle height of the drain ditch at the downstream right abutment (Photograph 8).
The exit point of the seepage was at a level higher than the upstream pond level.
Thus, the source of the seepage appears to be runoff from the hillside of the right abutment, and has no relation with the SNSWP.
No other seepage areas were observed at the dam.
Photograph 9 shows the downstream view of Lake Wylie.
The old cofferdam used in the construction of the SNSWP dam can be Es9n in this photograph.
c.
OutleLRiruct urn _and_ Instrument _Ela r.
The outlet structure is located on the shoreline several hundred feet to the right from the dam (Photograph 10).
This concrete structure protects the outlet pipe which is used to release water when the pond level is above the full pond dveign level (Photograph 11).
The top of the structure is covered with a heavily reinforced 2-foot thicP concrete slab for missile protection.
No signs of significant deterioration such as cracking or spalling were observed on any parts of the exterior faces.
The instrument pier is for access to the temperature probe.
The pier appeared to be in a satisfactory condition.
No signs of rusting or instability were noted (Photograph 12).
. d.
SHSWP_anLMyliiLResenoir.
The SilSWP shoreline was inspected from the dam and upstream abutments.
From visual observations, no significant erosion of the shoreline or accumulation of trash or debris were noted (photographs 5 and 12).
Duke's representative reported that a minor washout was observed on the shoreline southwest of the dam during the annual inspection in 1996.
The area was repaired with riprap stones.
The shoreline of the Wylie reservoir immediately downstream of the SilSWP dam was observed from the dam and no conditions of instability were noted (Photograph 9).
2.
Ins.tntmentation.
The S!1SWP dam is monitored by 8 piezometers and 12 t:urface monuments (Attachment 1).
Presently piezometers are read quarterly and surface monuments are surveyed annually.
Photograph 13 shows the gravel walkway access to piezometer 3 located in the middle height of the downstream slope.
Readings for the piezometers in the e...bankment are within historical levels (Attachment 2).
A review of the piezometer readings indicate that piezometer 7
had some anomalous measurements.
A close observation of piezometer 7 reveals that a depression ring is around the pipe of this instrument and rain water might cause these readings (Photograph 14).
Modification of the surrounding area to prevent water ponding and cleaning and testing of this instrument is necessary to ensure its proper functioning.
Surface monument surveys for vertical movement is referenced from the benchmark located at the right abutment (Photographs 15 and :.6).
The benchmark is periodically checked against a permanent benchmark installed in foundation rock located in the Reactor
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building.
Survey data indicate that surface monuments were surveyed monthly from the dam corepletion date of March 1978 to I
March 1987, then no measurements were taken until llovember 1993, t
whan the survey was resumed and has been taken annually since then.
Survey data indicated a zero vertical movement (settlement) to the i
north and approximately 0.1 inch settlement to the south between 1987 and 1993.
Therefore, it appears there was no adverse effect I
on the overall monitoring program caused by the gap of six years.
-Survey data indicate that the StiSWP dam experienced settlements l
ranging from approximately 0.1 inch to the north (loft) portion to 1 inch to the south (right) portion (Attachment 3).
The deep section is in the south portion and the measured 1 inch settlement since 1978. appears to be reasonable.
The annual survey should be maintained.
llowever, it is recommended that an offset survey to monitor horizontal movement should be conducted.
3.
Dalinair. gam _ Hazard Potential.
Thoro was a dwelling located at the left downstream too area at the time of this inspection (Photograph 7).
It appeared this structure may be affected by a failure of the SilSWP dam.
Other structures shown on Photograph.9 probably would not be affected since their foundations are located above the water level of Wylie lake.
In accordance with FERC criteria, the StiSWP dam would be classified as having a
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"Significant" hazard potential.
- However, the dwelling was subsequently removed by the licensee between April and July 1997.
Therefore, this dam is classified as a " Low" hazard potential
. structure.
- 4. C.gnaultant's safety _ Inspection Reparta.
There-are no inspection reports prepared by a consultant.
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. 5.
Duke's Inspention_PI.ogram.
Duke's periodic inspection j
and maintenance program is summarized as follows:
Insaantion Ersquency_. P_erforme O y Latt_Inap_antion Visual Quarterly C11 SIC 12/2/96 Piezomotora Quarterly CNSIC 12/2/96 Surface Monuments Annually survey crew 11/13/96 Engineering Annually CNSE 11/11 & 12/96 CNSIC - Catawba Nuclear Station Instrument Crew i
CNSE
- Catawba Nuclear Station Engineering B.
Operation _and_Raintenante.
The project appeared to be adequately maintained and no adverse safety related problems were identified by this inspection or by recent inspections conducted by Duke's staff.
Also, no significant deficiencies in maintenance of the project were noted during this inspection.
1.
DAR_and._APRurtsnant Itrus.tutes.
Riprap cover on the crest and upstream and downstream faces of the embankment appears to be adequately controlling erosion.
The riprap appeared to be free of vegetative growth.
During this inspection, no conditions were noted which require omorgency actions.
2.
Spillw ay_G ate s_and_S_t andby_E9_ver.
Not applicable as there are no gated spillways associated with the SNSWP.
The outlet structure controls the pond level by gravity flow through a steel pipu.
3.
P_oxer_Elant.
Not applicable as there are no hydro nonoration units associated with the SNSWP.
4.
Reservoir.
Based on observations during this inspection, the reservoir appeared to be clean and free of debris.
No excessive erosion of the shoreline was noted by visual inspection from the dam and its abutments.
During Duke's annual
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inspection in 1996, a washout area was observed at the south sido
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of the pond and riprap was placed to correct this slope l
instability.
This was a small area and had no significant offect on the water volume of the pond required for the standby cooling i
service for the reactor units.
5.
Rec.ords.
Design and construction records including as-built drawings and a final safety analysis report are maintained by Duke at the sitt and at the corporate office in Charlotte, North Carolina.
These documents are also maintained at the NRC-IlQ of flices in Washington, D.
C.
t 6.
EmerganGy_Ag. tion. Plan _1E&El.
Any emergency actions associate with the SNSWP are part of the overall emergency evacuation plan for the Catawba Nuclear station.
No separate EAP exists for the SNSWP at this time.
There is a dwelling located at the downstream left toe area which could be affected by a failure of the SNSWP dam if the floor level is lower than the pond level (Photograph 7).
This should be verified.
According to FERC criteria, an EAP is required for a project with a "Significant" hazard potential classification.
Cs EnYironmental. Publig 111a_and _ Saf aty.
No items of l
questionable.public safety were observed or reported during this l
reporting period.
The dam and pond are closed to the public.
The area is fenced and access gates are locked.
Existing public safety features appear adequate and are properly maintained.
No additional actions to protect life and property were required as a r6 cult of-the inspection.
D.
Katiers of commission Interett.
1.
AdditiQng. Bettermenta d attes.4_Ratirements, or Needed ext.tnai9AR.
None.
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DIodac.t_ Compliance.
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E.
Eindinga_and_In11ong_Ac. tion.
The inspection toum did not observo any conditions that should adversely affect the immediato safoty and permanonce of the project.
A mooting was hold at the site on the afternoon of February 26, 1997, and the following observations and recommendations woro discussed with llRC and Duke representativos:
1.
Increase the inspection frequency for the dam from quarterly to monthly.
2.
Rowork the area surrounding piezometer P-7 to prevent ponding rain water and clean and test this instrument to oncuro its proper functioning.
3.
Conduct offset surveys of the surface monuments to monitoring horizontal movement.
4.
Add a surface monument on top of the outlet structure to monitor its vertical and horizontal movements.
5.
Conduct periodic surveys of the reference benchmark in the plant from a USGS benchmark.
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Plan, Standby Nudcar Senice Water Pond Dam
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l Upstream view of the SNSWP dam, looking from tho l
crest on the left.
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I Photograph 3 02/26/97 Upstream slope of the left portion.
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Photograph 4 02/26/97 Left abutment of the dam; the road along the downstream too accesses a boat ramp.
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Photograph 5 02/26/97 Boat ramp located just to the left of the dam.
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j Riprapped dotnstream slope, looking from the left l
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Photograph 7 02/26/97 Tho left portion of the downstream slopo.
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dwolling was removed betwoon April and July 1997.
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Photograph 8 02/26/97 The drainago ditch at the downstream right abut-ment.
Noto scepage exits at the middle height of the ditch.
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A view of the downstream Lake Wylie, looking from the top of the S!!SWP dam.
Note the breached coffordam used for the construction of the dam (arrow).
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Photograph 10 02/26/97 overall view of the outlet works, located at the right of the dam.
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Page 1 i
CATAWBA SNSW DAM SETTLEMENT READINGS 1___
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CATAWBA SNSW DAM SETTLEMENT READINGS I
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-0.016
-0.018
-0.018
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i t
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l 4
Page 3
a CATAWBA SNSW DAM SETTLEMENT READINGS -
1 12/8/80 1/19/81 2/17/81 3/6/81 4 /10J31 5/29/81 6/25/81 7/7/81 8/28/81 9/4/81 10/2/81 i
SM#1 593.700 593.706 593.698 593.718 593.700 593.711 593.702 593.709 593.711 593.696 l
SM#2 594.089 594.096 594.088 594.107 594.093 594.109 59A 086 594.091 594.094 594.086 SM#3 594.638 594.647 594.639 594.655 594.643 594.649 594.643 594.643 594.645 594.643 SM#4 594.932 594.945 594.934 594.963 594.939 594.952 594.938 594.939 594.939 594.933 SM#5 594.568 594.582 594.570 594.591 594.576 594.585 594.575 594.574 594.575 594.580 SM#6 594.618 594.627 594.616 594.637 594.624 594.634 594.623 594.626 594.624 594.630 I
SM*7 594.330 594.346 594.335 594.350 599.342 594.349 594.339 594.339 594.343 594.341 SM*8 594.380 594.396 594.383 594.397 594.388 594.398 594.384 594.382 594.388 594.395 I
SM#10 5
3 5
3 3 3 38 53
. 6 9.3 SM#11 593.281 593.283 593.283 593.282 593.283 593.283 593.283 593.281 593.283 593.288 l
SM#12 592.903 592.906 592.903 592.903 592.903 592.904 592.899 592.898 592.P95 592.906 4
I SM#1
-0.070
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CATAWBA SNSW DAM SETTLEMENT READINGS
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11/13/81 12/10'81 1/4/82 2/7/82 3/5/82 4/2/82 5/10/82 6/4/82 7/2/82 8/6/82 9/3/82 SM*1 593.703 593.704 593.708 593.698 593.703 593.715 593.694 593.701 593.694 593.690 SM#2 594.090 594.092 594.087 594.085 594.093 594.100 594.088 594.089 594.083 594.081 SM*3 594.649 594.652 594.648 594.640 594.644 594.648 594.635 594.642 594.634 594.640 t
SM#4 594.940 594.950 594.941 594.938 594.942 594.942 594.933 594.937 594.928 594.926 SM#5 594.584 594.636 594.579 594.576 594.578 594.577 594.571 594.574 594.565 594.561 SM#6 594.636 594.632 594.631 594.623 594.624 594.627 594.620 594.623 594.616 594.611 i
SM*7 594.350 594.344 594.339 594.336 594.339 594.342 594.339 594.341 594.335 594.329 SM*8 594.400 594.398 594.392 594.387 594.391 594.387 594.382 594.309 594.378 594.375 SM*9 594.059 594.049 594.051 594.043 594.049 594.056 594.046 594.045 594.044 594.041 SM*10 593.544 593.539 593.547 593.536 593.535 593.535 593.532 593.528 593.532 593.530
~
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+
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P 1
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i Page 6
CATAWBA SNSW DAM SETTLEMENT READINGS i
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1 l .e CATAWBA SNSW DAM SETTLEMENT READINGS { 1 1 I I l 1 1 7 j j -L } j j 'j i -+ - _ + A i . -I ! 8/9/84 9/7/84 f 10/10/84 ) 11/9/84 12/17/84 1/23/85 i 2/27/85 ! 3/19/85 1 4/17/85 5/9/85 6/17/85 I I I l } f 593.706 593.701 593.698 I 593.696 l 593.682 l 593.698 593.6867 593.6787 593.693. 593.696 SM#1 J 593.699 594.090 1 594.086]4 2 594.086 594.082 ! 594.064 i 594.002 594.070 (594.058 l 594.073 ! 594.080 SM*21 594.087 SM*3 I - 594.630 l 594.6357 594.630j 594.63 594.628 ; 594.614 594.629 594.616 1 594.611 ( 594.62'S I 594.628 i SM#4 I 594.929 I594.929 594.927 i 594.930 594.926 i 594.907 i 594.928 594.913 l 594.912 1 594.922 j 594.925 .SM*5 l 594.572 594.570 594.55 { 594.570,[594.561 594.5471 594.562 594.551 i 594.549 [ 594.558 ! 594.564 _SM*6 l 594.617 594.618 594.613 L 594.619 594.612 1 594.599 { 594.612 594.001 1 594.594 ! 594._606 i 594.609_ SM*7j 594.334[594.334, 59_4.333 (594.335_ _594.334J 594.319] 594.3271 594.324 L594.321 i 594.325 j 594.323_ ' i SM#81 594.379 l 594.384 594.379 ! 594.3841594.379 i 594.369 i 594.381 { 594.370 j 594.265 i 594.377 } 594.378 S_M*9J 594.041 ! 594.048 594.045 ! 594.052 594.046 1 594_.033 594.046 594.032 l 594.031 [ 594.037 i 594.042 _SM*10 l 593.526 f593.536_ 593.535 { 593.534 _593 5311593.524 593.531 593.526 [ 593.52_0__L 593.529 j 593.534_ -[ SM#111 593.274 { 593.282,[ 593.284 i 593.281 593.280 l 593.273 593.230 i 593.278 1 593.272 ' 593.280] _593.278 . j ] 592.891 j 592.902 SM#12 592.902 592.896 592_.900 592.897 ' 592.891 592.895 592.896 592.S99 4 592.898 ' l .- b _ -. - J l-Q } l i g i . 7 L---- l-- L._- y m -. + 1 L 4 4 _L_ l 1 1 _p 4._ ~ l -0.084 SM*1 -0.071 -0.064 ' -0565 _-0.0Y2 ] ~ ~
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