DOCKET NOS. 50-325PAND 50-324 p LICENSE NOS. DPR-71 …Thmugh differential leveling to existing...
Transcript of DOCKET NOS. 50-325PAND 50-324 p LICENSE NOS. DPR-71 …Thmugh differential leveling to existing...
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Carolir- Dower & Lignt Company
January 12, 1979
FILE: NG-3514($ SERIAL: GD-79-ll6
Mr. Harold R. Denton, DirectorOffice of Nuclear Reactor Regulationr ited States Nuclear Regulatory CommissionnWashington, D. C. 20555
BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2DOCKET NOS. 50-325PAND 50-324 pLICENSE NOS. DPR-71 AND DPR-62
SEISMIC MONITORING PROGRAM
Dear Mr. Denton:
Since July 1977, the National Oceanic and Atmospheric Administration(NOAA) has been collecting data from the Southport, North Carolina tidal gagestation in accordance with the leveling portion of Phase I of Carolina Power &Light Company's " Brunswick Steam Electric Ilant Program for Seismic Monitoring"dated June 10, 1975, revised June 27, 1975.
Attached to this letter are five (5) copies of an interpretive reportprepared by the National Ocean Survey (NOS) of NOAA based on their data col-lected at Southport, as well as supportive information from tide gaget at otherlocations. Their conclusion is that the Southport area has been undergoing sub-sidence for several decades at the same general rate as other East Coast sites.This corroborates the results of the seismic monitoring program which also showedno evidence of any anomalous conditions.
In light of these conclusions, CP&L requests that the NRC staff authorizetermination of the leveling portion of Phase I of the "BSEP Program for SeismicMonitoring" dated June 10, 1975, as revised June 27,1975 (i.e. , Appendix A toAmendment No. 3 of License DPR-62). The NRC's authority for taking this actionis established in the Facility Operating Licenses, Condition 2.C(3) which statesthat CP&L would " undertake a program for seismic monitoring for a minimum of twoyears unless termination is earlier approved by the NRC Staff." It is evident
that the original concept of the seismic study would allow for modification tothe program as factual information became available. Since the authority to makethe requested modification is included in Appendix A to Amendment No. 3, a licenseamendment is not necessary.
gu- _ .m _ - - ~ -
m_. m
411 Fayetteville Street * P. O. Box 1551 * Ra!ergh. N. C. 27602
RP@7 9 0117 0 2|i ur= - -- =a-
.Mr. Harold R. Denton -2-,
,
January 12, 1979.
*.
As stated in our September 21, 1977 letter, the leveling portion ofPhase I could be deleted prior to completion of the two-year period if the staffconcurs that the tidal data is not indicative of uplift in the Southport area.Since this is the conclusion reached by the National Ocean Survey, we requestthat you approve termination of the leveling portion of Phase I of our seismicprogram and that it be effective as soon as possible.
Should you have any questions regarding this request, please contactus.
Yours very truly,
EtE. E. Utley
Senior Vice PresidentPower Supply
JAM /mfAttachment
cc: Mr. Thomas S. Erwin
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,f%h., O..*
$T-77- f UNITED STATES DEPARTMENT OF COMMERCE*
g M.?q(f%pf..e, /;National Oceanic and Atmospheric AdministrationNATICNAL CCE AN SLAVEY*
acc s e.M3 acasa-
C3311/JRH617-D.Oll7
October 31, 1978
Mr. Gary ForrestCaInlina Power & Light CtrupanyP.O. Box 1551Raleigh, North Camlina 27602
Dear Mr. Forrest:
The following is a prelinnnary NOS report on sea level trends at Southport,North Camlina, 1933-1978:
1. Historical Infonnation
Tidal measurements were made at Ecuthport, North Carolina for 21 years,1933-1953. Mean sea level values were detennined based on the 1941-1959National Tidal Datum Epoch. The control station used for simultaneouscomparison was Charleston, South Carolina.
The plotted curves of nonthly and annual sea level show both Southportand Charleston t: have similar sea level variations, with a slow secularrise in sea leve.; relative to land between 1933-1953 (see Figs. 1 and 2).
II. Reinstallation of Southport Tide Gage
A tide gage was installed by NOS at Southport, North Carolina in 1977, atthe request of the North Carolina Power & Light Ccmpany.
To date,10 nonths of tide record have been tabulated and reduced to meanvalues based on the 1941-1959 National Tidal Datum Epoch through comparisonwith the control station at Charleston, South Carolirat.
Thmugh differential leveling to existing tidal bench marks and tide staff,a connection was unde between the historical tidal series and the latest1977 infornation (see Table 2).
III. Conclusion
After comparing the sea level value detennined fmm the 1933-1953 periodat Southport with the latest 10 nonths of record in 1977, and taking intoaccount the + 0.1 ft. variability expected from a 10 month tidal series,
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2
we find that no significant change in sea level has taken place duringthe last 25 years.
This fact is substantiated by sindlar sea level tmnds observed atC1arleston and other long tenn contml stations along the east coast.Annual sea level curves have been plotted for Boston, Massachusetts;Charleston, South Camlina; and Miand Beach, Florida (see Figs. 3, 4,and 5).
The annual sea level tmnd at all thme stations show a grndimi secularrise in sea level relative to land but with a reduced rate of changeduring mcent years (see Fig.1).
Fmm the tidal infornntion available, it is reasonable to assume thatsea level changes at Southport over the last 25 years wem generallyin the sam direction and magnitude as other east coast stations, suchas 01arleston, South Camlina.
Sea level changes am influenced by many factors but are chiefly due tothe conbinaticx1 of eustatic rise (wrld glacial mlting), and localtectonic mvement (subsidence or emrgence).
At this time, them is no conclusive evidence fmm our tidal masumentsto show any dramatic tectonic changes occurring at the Southport gagesite.
Sincerely,
hin z. A v
Jams R. Hubbard011ef, Tidal Datum SectionTides and Water Levels BranchOceanographic Divisicn
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