ML20210S850
| ML20210S850 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 03/26/1976 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1644 NUDOCS 8605290455 | |
| Download: ML20210S850 (4) | |
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Edson G. Case, Deputy Director. Office of Nuclear Reactor Regulation WPPSS 3 AND 5 SEISMDLOGY AND GEOLOGY RgYIEN Carl Stepp and David Budge of the NRC staff conducted the mai-legy and geology review of the WPPSS 3 and 5 plant site.
Dr. Budge has a Ph.D. in geology frca the University of California and has been with the NRC since the summer of 1973. He has been deeply involved in the review of a number of complex sites and has demonstrated a high degree of competsace in determining the geologic hazards affecting plant sites.
Carl Stepp has been with the NRC since the spring of 1973 and is Chief of the Geology and Seismology Branch. Prior to joining the NRC, Dr. Stepp spent 11 years with the U. S. Coast and Geodetic Survey as a research seismologist.
The USGS was not asked to review this site because Carl Stepp already had extensive knowledge of the regional geology and seismology and David Budge had had a strong working knowledge of west coast stratigraphy.
During the acceptance review, David Budge contacted Howard Gower of the USGS who is heading an environmental geologic mapping prograa in the Puget Sound area.
Dr. Gower recommended Weldon Rau of the Washington State Geological Survey as being the geologist most knowledgeable about structure and stratigraphy in the WPPSS 3 and 5 region.
Dr. Rau has done considerable geologic : mapping in the region of the WPPSS 3 and 5 site and north of it.
He is the person most familiar with the stratigraphic units needed to assess the age of faulting in the area. Since we were primarily concerned in our geology review with identifying and dating the movements on faults near the plant site region Dr. Rau was able to provide us with the information on this issue that we needed for our review. He accompanied David Budge en visits to the site on three occasions. He reviewed the PSAR and provided soms informal questions or requests for additional informaties which we transmitted to the appli-i cant. We believe that with his input we were able to satisfactorily determine the geological relationships in the site area sud feel confident in our review.
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s The seismological review was conducted independently by Carl Stepp.
Dr. Stepp, prior to joining the NRC, spent two years working on seismic risk mapping in the Fuget Sound region.
Ha, therefore, was already familiar with the literature of the region and was aware of the known relationshipa between earthquakaa and geologic structure in the region of the site.
The WFFSS 3 and 5 site is located on the southwest estent of the Fuget Sound lowlands. Although the utility proposed a division of tectonic provinces which would have placed the site within the Wallapa Hills tectonic subprovince, in our review we censidered the site to be re-lated to the larger Puget Sound region. The mawi== historic earthquake in the Puget Sound region produced an intensity VIII. This earthquaka, if assumed at the site, would result in an 0.25g acceleration. However, the maximum historic earthquake was not controlling in determining the acceleration for seismic design for WPFSS 3 and 5 because of the presence of " capable" faults near the proposed site. The applicant did an ex-tensive and thorough analysis of the relationship betweet earthquakes and geologic structures in the region. Most of the major earthquaka producing structures are not apparent at the surface. They do produce very large gravity anomalies, however, permiting their extent to be easily mapped. The safe shutdown carthquake at the site was based on an assessment of the==wf==
earthquake that can reasonably be expected to occur on the nearest capable fault to the site - 21 mitam away.
The assessment of the maximum earthquake on that structure was based on a conservative estimate of the percentage of the total structure that could break in a single earthquake and a conservative interprete-tion of the empirical relationship between langth of fault rupture and carthquake magnisuoe. Finally, the acceleration at the site was computed on the basis of curves that envelop the world-wide data set, and this value was incorporated into the design as the high frequency anchor (33Hz) for Regulatory Guide 1.60 response spectra to be applied at the foundation level of structures. We accepted the applicant's proposed acceleration for seismic design of.323 because we found his smalysis to be conservative.
l During the ACRS meeting on March 4, Dre Stepp was asked for an estimate ef the probability that the acceleraties for seismie design (0.323) for l
the WFFSg 3 and 5 plant would be==amaded.
He replied that no conyutation of that probability had been attempted. However, he added that eamputa-tions indiaats the probability of se intamaity Y111 being exceeded at Aberdeen, about 12 miles from the WFFgg 3 and 5 site, is of the order of 10-3 per year. Dr. Stepp finally stated that it is his view that the
.323 is near en wpper bound value of aseelaration for seismic design for the WFPsS 3 and 5 site.
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i While the probability of this acceleration at the WPPSS site being exceeded has not been coeputed. Dr. Stepp would expect it to be orders of magnitude lower than the probability of an intensity 8 at Aberdeen being exceeded. It is Dr. Stepp's judgeant that the probability that the.323 acceleration will be exceeded at the WPPSS site is extremely low (i.e. less than 10-5 per year). This difference in probability is primarily attributable to the facts that the WFPSS 3 and 5 facilities are founded on bedrock with the 0.32g seismic input applied at the foundation level. whereas Aberdeen is sited on valley alluvium which is observed to result in higher intensities for a given magnitude earthquake.
c Rarold R. Denton. Director Division of Site Safety and Environmental Analysis l
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While the probability of this acceleration at the WFPSS site being exceeded has not been computed, Dr. Stepp would expect it to be orders of magnitude lower then the probability of an intensity 8 at Aberdeen belag exceeded. Moreover, it is his view that.323 is near an upper bound value for this site. Coemidored in this context, it is Dr. Stepp's judgment that the probability that the.323 accelera-tion will be exceeded at this site is extremely low (i.e. less than 10-5 per year).
Harold R. Denton, Director Division of Site Safety and Environmental Analysis DISTRIBUTION:
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Suzanne reblur.ct, Cost-Genefit Specialist Cost-t:nefit Analysis Granch, Division of Site Safety :nj Environnental Analysis THRU: Conald J. Skovholt, Assistant Director for Quality Assurance and Operations Division of Project l'anagenent f
RC7 JEST FCP. CAPITAL COST LSTI'! ATE FP.31 CO:: CEPT: 1-lPPSS l.7)CLE.C PROJECT i;0 S. 3 A!;3 5 Enclosed is a confir,1ation of my telephone request to !!cuard Dowers of Oak T.idy i;ational Laboratory on ". arch 25, 1976 for 00::CLPT capital cost estimtM t.'ith :PT t in PPDU ne.
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O h C. Petcrsen, Financial Analyst Office of tr.o /,s.ista.t Dire:ter fer Caslity Assurar.:e a 11 Cy.ra ticas i
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d E REQUEST FOR CAPITAL C(,,,t ESTI"\\TE FROM CO:iCEPT ink..I DATA 1. Required informatto_n WPPSS Nuclear Project Nos. 3 and 5 1. Plant name 2. P.lant location - Satsop, Washington Pressurized water reactor 3. Type of plant natural draft cooling towers 4. Type of heat discharge 1240 Mwe (each) 5. Unit size, net W(e) 2 6. Number of units
- 7.. Month and year NESS ordered Unit 4 3
- 6/73 Unit 4 5 - 10/74 mratxc Woes
- 8.
Month and year of co:cercial operation 3/82 Unit xy 3 Unitxy 5 9/83 AMNx1 I MENT
- 9.
Interest during construction 7.5% Interest rate, porcent/ year a. i b. Simple or compoundt - simple
- 10. Length of construction worirweek, hourn - 40 II.
Desirable Infor: nation 1. Cost of site land, dollare - $3,500,000 7. Katisated cite labor requirements, kan hourn/kW(e) - Unit 3 - 10.2 Ur.it 5 - 8.9 (includescontingency) Average site Inbor pay rate (including fringe bene.ftts)- Unit 3 - $15.25 3. in August 1975 $/ hour Unit 5 - $16.00 Aversge encaintion rates projected for site labor, perceg/g ar L 4. 5. Average escalation rate projected for site materlata (e.g., structural steel, rebars, concrete, lunber), percent /ycar 6% compounded 5 L..... -... ,}}