ML20210T342
| ML20210T342 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 09/30/1986 |
| From: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Toyama F ARMY, DEPT. OF |
| References | |
| NUDOCS 8610080426 | |
| Download: ML20210T342 (5) | |
Text
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SEP 3 0 1986 Docket Nos.: 50-266 and 50-301 MEMORANDUM FOR:
George E. Lear, Director PWR Project Directorate #1 Division of PWR Licensing-A FROM:
Timothy G. Colburn, Project Manager Project Directorate #1 Division of PWR Licensing-A
SUBJECT:
FORTHCOMING MEETING WITH WISCONSIN ELECTRIC POWER COMPANY (WEPC0)/BECHTEL, ENERGY ABSORBERS AS REPLACEMENTS FOR SNUBBERS, POINT BEACH NUCLEAR PLANT UNITS 1 AND 2 DATE & TIME:
Friday, October 17, 1986 9:00 AM - 4:00 PM LOCATION:
Room P-110 Phillips Building Bethesda, MD PURPOSE:
To provide the NRC and its contractor, Brookhaven National Laboratory (BNL) with additional information supporting the use of energy absorbers as replacements for snubbers as seismic supports in safety-related piping systems.
Participants:
NRC/BNL WEPC0/BECHTEL G. Lear, NRC Dr. H. Ming, Bechtel T. Colburn, NRC M. Khlafallah, Bechtel G. Bagchi, NRC K. Weidner, Bechtel S. Hou, NRC T. Van Vick, Bechtel M. Reich, BNL G. Frieling, WEPC0 G. De Grassi, BNL S. Cartwright, WEPC0 C. Krause, WEPC0 A Meeting Agenda is attached.
/s/
Timothy G. Colburn, Project Manager Project Directorate #1 Division of PWR Licensing-A
Attachment:
Meeting Agenda cc's: See Next Page l
Office:
PM/ PAD #1g g#
Surname: TColburn/tg Lear Date:
09dl/86 09/3d/86 mo See MWh' e
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Mr. C. W. Fay Point Beach Nuclear Plant Wisconsin Electric Power Company Units 1 and 2 cc:
Mr. Bruce Churchill, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N. Street, N.W.
Washington, DC 20037 Mr. James J. Zach, Manager Point Beach Nuclear Plant Wisconsin Electric Power Company 6610 Nuclear Road Two Rivers, Wisconsin 54241 Mr. Gordon Blaha Town Chairman Town of Two Creeks Route 3 Two Rivers, Wisconsin 54241 Chairman Public Service Commission of Wisconsin Hills Farms State Office Building Madison, Wisconsin 53702 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 799 Roosevelt Road Glen Ellyn, Illinois 60137 Resident Inspector's Office U.S. Nuclear Regulatory Commission 6612 Nuclear Road Two Rivers, Wisconsin 54241
MEETING AGENDA OCTOBER 17, 1986 9:00 A.M. - General Introduction 9:15 A.M. - Noon - Discussion of the attached Additional Information Request i
Noon - 1:00 P.M.
- Lunch 1:00 P.M. - 3:45 P.M. - Follow-Up discussion of WEPCOs September 3, 1986 i
response to NRC staff's July 15, 1986 request for additional information
.j 3:45 P.M. - 4:00 P.M. - Closing Remarks 4:00 P.M.
Adjourn i
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REQUEST FOR ADDITIONAL INFORMATION ON INSTALLATION OF ENERGY ABSORBERS IN PLACE OF SNUBBERS FOR POINT BEACH NUCLEAR PLANT, UNIT 1 & 2
REFERENCES:
1.
Wisconsin Electric' Letter VPNPD-86-207, C. W. Fay to H. R. Denton,
" Dockets 50-266 and 50-301, Energy Absorbers as Replacements of Snubbers for Seismic Support of Nuclear Piping Systems, Point Beach Nuclear Plant, Units 1 and 2", dated May 13, 1986.
2.
" Reanalysis of Main Steam Line Outside Containment with Energy Absorbers as Replacement for Hydraulic Snubbers for the Point Beach Nuclear Plant", prepared by Bechtel Power Corporation (Enclosure 1 to Ref. 1),
3.
M. Z. Khlafallah and H. M. Lee, " Technical Basis for the Use of Energy Absorbers as Supports of Nuclear Power Plant Piping Systems", Bechtel Power Corporation, January, 1985 (Enclosure 2 to Ref. 1).
4.
M. Z. Khlafallah and H. M. Lee, " Technical Basis for the use of Energy Absorbers as Supports of Nuclear Power Plant Piping Systems,"
(Proprietary Version), Bechtel Power Corporation, January,1983.
QUESTIONS:
Analytical Methodology 1.
Define the stress-strain and hysteresis curves used to define the EA properties. Are these curves best estimate, upper bound or lower bound? Are they based on specific EA material tests?
Damping 2.
Equivalent viscous damping factors calculated by equation 5-4 of Reference 4 are based on a steady state sinusoidal motion assumption.
Justify the application of these equivalent damping factors to transient loads.
3.
How do changes in the hysteresis curves due to cyclic thermal loads affect EA damping?
Design Considerations 4.
Since snubber removal will change the dynamic characteristics of the piping systems, will each system be monitored for changes in normal operating vibrations?
5.
Can multidirectional loads be transmitted through EA's.
If so, how are the off direction loads considered in the analysis?
(
2 Regulatory Guide 1.84 Requirements 6.
Provide a iist of piping systems in the plant in which the EA's will be used.
Test Correlations 7.
Section 4.5(b) of Reference 4 demonstrates the need to calibrate the frequency and damping parameters of the piping model to achieve accurate results. Will the calibration be applied on a production basis? If not, provide justification.
8.
Figures 5.5 and 5.9 show that linear analysis can underpredict response.
How will this potential underprediction be accounted for in production runs? Do the sample problems represent worse cases or can more significant underprediction be possible?
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MEETING NOTICE DISTRIBUTION Distribution Copies:
10ecketTFiles;3 NRC PDR Local PDR ORAS HDenton CRossi Glainas DCrutchfield Glear TColburn PShuttleworth OGC-Bethesda GGears DMuller EJordon BGrimes JPartlow (Emergency Preparedness only)
Receptionist ACRS(10)
OPA LFMB MSchaaf NRC Participants PAD r/f PAD s/f Licensee / Service List t
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