ML20237K046

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Summary of 870624 Meeting W/Eqe,Inc to Discuss Lll Seismic Design Audit of Plant.Viewgraphs Encl
ML20237K046
Person / Time
Site: Hatch  
Issue date: 08/18/1987
From: Tan C
Office of Nuclear Reactor Regulation
To: Crocker L
Office of Nuclear Reactor Regulation
References
NUDOCS 8708270029
Download: ML20237K046 (71)


Text

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[ Distribution *w/o enclosure Central FileMLReiter

  • Local /NRC PDR CPTan
  • ESGB Rdg File
  • GBagchi
  • MEMORANDUM FOR:

L. Crocker, Project Manager Project Directorate II-3 Division of Reactor Projects I/II FROM:

C. P. Tan, Civil Engineer Structural and Geosciences Branch Division of Engineering and Systems Technology

SUBJECT:

SUMMARY

OF MEETINGS WITH DR. JAMES JOHNSON OF EQE CONSULTANT TO LLNL A meeting with Dr. James Johnson of EQE consultant to LLNL was held in Room P1114-8 on June 24, 1987 to discuss the status of the LLNL technical assistance project on Hatch Units 1 and 2 seismic design audit. Dr. Johnson described the status of-the project and presented the findings to date in his independent review of Hatch 1 and 2 seismic analysis and design.

The meeting was attended by myself, L. Reiter, Chief of the Geosciences Section and G.

Bagchi, Acting Chief of ESGB. A copy of the viewgraphs used in the presentation is enclosed.

4. f. Y C. P. Tan, Civil Engineer Qs2Joh29s p

- [

Structural and Geosciences Branch n0 Division of Engineering and Systems Technology

Enclosure:

As stated cc:

J. Richardson w/o enclosure B. Youngblood w/o enclosure CONTACT:

C. P. Tan, X29444 l

Y hb ESGB: DEST 4['T ESGB: EST ESGB: DEST CPTan:jch LR 1-r GBagchi 8//(/87 8/ g 87 8/tV/87

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REVIEW OF SEISMIC ANALYSIS AND DESIGN OF HATCH UNITS 1 AND 2:

STATUS REPORT Presented to US NRC Nuclear Reactor Regulation Presented by James J. Johnson June 24,1987

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  • BACKGROUND
  • REVIEW OF HATCH DESIGN 1-e HATCH STRUCTURES e SEISMIC ANALYSIS PROCEDURES e UNITS 1 AND 2
  • ORIGINAL AND REANALYSIS
  • HATCH SITE CHARACTERISTICS
  • INDEPENDENT SEISMIC ANALYSES e REACTOR BUILDING
  • CONTROL BUILDING l-e RESULTS AND CONCLUSIONS e NEXT STEPS

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I THE HATCH REVIEW ENCOMPASSES SEVERAL ISSUES f

e UNITS 1 AND 2 SEISMIC DESIGN CRITERIA e IN - STRUCTURE SPECTRA PEAK BROADENING

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e UTILITY REANALYSIS e UPGRADE MODELS e REMOVE EXCESS CONSERVATISM

  • GENERATE FLOOR RESPONSE SPECTRA e COMPARE WITH ORIGINAL DESIGN SPECTRA e EVALUATION e DVRC DAMP!NG FOR PIPING e UNIT 1 DESIGN GROUND RESPONSE SPECTRA

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g INFORMATION FOR THIS EVALUATION WAS PROVIDED AS FOLLOWS:

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  • INITIAL REQUEST SEPTEMBER 11,1986
  • SOIL PROFILE, FOUNDATION DATA
  • DAMPING -- PROCEDURES, VALUES
  • FLOOR RESPONSE SPECTRA COMPkRISON
  • DYNAMIC MODEL -- DG BLDG
  • SEISMIC ANALYSIS METHODS COMPARISON
  • NOVEMBER 13,1986
  • FOLLOW - UP REQUEST DECEMBER 15,1986
  • SOIL PROFILE
  • DYNAMIC MODELS -- RB UNIT 1, CONTROL

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  • ARTIFICIAL ACCELERATION TIME HISTORIES -- UNITS 1 AND 2
  • MARCH 4,1987 i

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  • SUBSTANTIAL CONSERVATISM EXISTS IN DESIGN RESPONSE DUE.TO SSI/ STRUCTURE ANALYSIS PROCEDURES EVEN IGNORING EMBEDMENT
  • IN GENERAL, BOTH SOIL PROFILES SHOW CONSERVATISM. HOWE"ER, LOW FREQUENCY RESPONSE FOR THE SOFT PROFILE SHOWS SOME EXCEEDANCES.

l CASE 2 EMBEDDED FND/ UNIT 1 GROUND MOTION eVERY SUBSTANTIAL CONSERVATISM EXISTS IN DESIGN RESPONSE WHEN EMBEDMENT EFFECTS ARE INCLUDED FOR THE SOFT PROFILE: COMPARABLE RESPONSES FOR THE STIFF PROFILE l

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  • N - S DIRECTION -- DESIGN RESPONSES ENVELOPE ABOVE FOUNDATION
  • E W DIRECTION -- EXCEEDANCES AT LOW FREQUENCIES CASE 4 EMBEDDED FND/ UNIT 2 GROUND MOTION l
  • DESIGN RESPONSES ENVELOPE EXCEPT FOR SLIGHT EXCEEDANCES AT LOW FREQUENCIES

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c OBSERVATIONS AND CONCLUSIONS FOR THE CONTROL BUILDING i

CASE 5 SURFACE FIND / UNIT 1 GROUND MOTION e SUBSTANTIAL CONSERVATISM EXISTS IN DESIGN RESPONSE DUE TO SSI/STRUCTUP.E ANALYSIS PROCEDURES e IN GENERAL, BOTH SOIL PROFILES SHOW CONSERVATISM. HOWEVER, LOW FREQUENCY RESPONSE FOR THE SOFT PROFILE SHOWS SOME EXCEEDANCES CASE 6 SURFACE FND/ UNIT 2 GROUND MOTION i

  • SPECTRAL PEAK ACCELERATIONS ARE LESS THAN DESIGN RESPONSE

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e SUPPLEMENT EXISTING COMPARISONS WITH UNIT 2 DESIGN RESULTS l

e COMPLETE SIMILAR ANALYSES FOR THE DIESEL GENERATOR BUILDING AND THE INTAKE

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  • NRC TO PROVIDE SITE SPECIFIC GROUND MOTION DEFINITION FOR UNIT 1 EVALUATION l

e PERFORM EVALUATION OF REACTOR BUILDING, CONTROL BUILDING, DIESEL GENERATOR BUILDING, AND INTAKE STRUCTURE FOR NRC SPECIFIED SITE SPECIFIC SPECTRA e DOCUMENT RESULTS AND CONCLUSIONS i

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