ML19254B442
| ML19254B442 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 08/31/1979 |
| From: | Verrelli D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-11158 NUDOCS 7909270817 | |
| Download: ML19254B442 (2) | |
Text
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UNITED STATES yw
- t NUCLEAR REGULATORY COMMiss!ON j.y $ 5 WASHINGTON, D. C. 20555
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'% #4 8 AUGUST 3 1 1979 j
Docket No. 50-366 LICENSEE: Georgia Power Company FACILITY Edwin I. Hatch Unit No. 2
SUMMARY
OF MEETING WITH GEORGIA POWER COMPANY ON SETTLEMENT OF STRUCTURES -
HATCH UNIT NO. 2 On August 30, 1979 members of the staff met with representatives of Georgia Power Company in Bethesda, Maryland. The purpose of tre meeting was for the staff to provide clarification of the staft's request for additional information which was transmitted to Georgia Power Company by letter dated July 20, 1979 (Enclosure 1).
The staff discussed each question and indicated the need for documenta-tion on each of the items such that an adequate basis exists to approve the licensee's December 1, 1978 request for a Technical Specification change. The licensee agreed to provide the requested information.
A list of attendees is attached as Enclosure,'
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&f Jy srh Opera / M. Verre li, Project Manager Davi ting Rea tors Branch #3 Division of perating Reactors
Enclosures:
1.
NRC letter to GPCo dated 7/20/79 2.
List of Attendees 1044 22l h909 270 @/7 P
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1 Mr. Charles F. Whitmer August 31 n79 Georgia Power Company
-2 cc:
G. F. Trowbridge, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 Ruble A. Thomas Vice President P. O. Box 2625 Southern Services, Inc.
Birmingham, Alabama 35202 Mr. Harry Majors Southern Services, Inc.
300 Office Park Birmingham, Alabama 35202 Mr. William Widner Georgia Power Company Power Generation Department P. O. Box 4545 Atlanta, Georgia 30302 Mr. L. T. Cucwa Georgia Power Company Engineering Department P. O. Box 4545 Atlanta, Georgia 30302 Appling County Public Library Parker Street Baxley, Georgia 31413 Mr. R. F. Rogers U. S. Nuclear Regulatory Commission P. O. Box 710 Baxley, Georgia 31513 Mr. Charles F. Whitmer Vice President - Engineering Georgia Power Company P. O. Box 4545 Atlanta, Georgia 30.02 044 222
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UNITED s* iTEs 3, %,,,
NUCt. EAR REGut.A10RY COMMISSION a
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wAsmuorou. a. c.2 esse JUI.Y 2hd73 Docket No. 50-366-Mr. Charles F. Whitmer Vice President - Engineering Georgia Power Company Post Office Box 4545 Atlanta, Georgia 30302
Dear Mr. Whitmer:
We are continuing our review of your submittal dated December 1,1978
' which proposed Technical Specification changes for settlement of Class I structures on Hatch Nuclear Plant Unit No. 2.
We have detemined that supplementary information, in addition to that requested by our letter dated March 30,1979 is required. This infomation is identified in.
In order to provide for timely completion of our review we request that a revised submittal which includes the additional infomation identified in Enclosure 1 be provided within 30 days o' your receipt of this letter.
Should you have any questions, please contact us.
Sincerely,
/_
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Thomas
.'Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosures:
Request for Additional Infomation ec w/ enclosure:
see next page 1044 223
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t Mr. Charles F. Whitmer Georgia 7:wer Company.
cc:
G. F. Trewbridge, Esquire Shaw, Pittman, Potts and Trewbridge 1800 M Street, N. W.
Washington, D. C.
20036 Ruble A. Thomas Vice President P. O. Box 2625 Southern Services, Inc.
Bir.ningham, Alab,ama 35202
. Mr. Harry Majors Southern Services, Inc.
300 Office Park Birmingham, Alabama 35202 Mr. William Widne'r Georgia Power Company Power Generation Department P. O. Pox 4545 Atlanta, Georgia 30302 Mr. L. T. Gucwa Georgia Power Company Engineering Department F. O. Box 4545 Atlanta, Georgia 30302 Appling County Public Library Parker Street Baxley, Georgia 31413 Mr. R. F. Rogers U. S. Nuclear Regulatory Com-ission P. O. Box 710 Baxley, Georgia 31513 1044 2g4 2
EtiCLOSURE REQUEST FOR ADDITIONAL INFORMATION GEORCIA POWER COMPANY EDWIN I. HATCH NUCLEAR PLANT UNIT NO. 2
" SETTLEMENT OF CLASS I STRUCTURES"
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A.
Paragraph 2.0 Settlement Measurement The following items are important and are not covered clearly in this section.
1.
Explain where the reference benchmar'ks are located; what provisions have been made to avoid any displacement and/or settlement of the reference benchmarks; how and with what frequency are their elevations periodically checked.
2.
Explain the method used to determine the settlements, and possible horizontal displacements of other benchmarks with respect to the reference benchmarks.
3.
Indicate by means of sketches the details of all the benchmarks:
location, shape, material, anchorage of benchmarks.
4.
Indicate on sketches the relative locations 'of all penetrations, including electrical penetrations, penetrations of ducts (if any) etc. with respect to the benchmarks. Discuss possible difference in values of actual settlements of penetrations and settlements measured at benchmarks.
5.
Discuss whether the benchmark arrangement permits the computation of rotation, tilting and sliding of structures in addition to the vertical settlement.
6.
Total settlements since the beginning of ecnstruction are important.
Hcwever, as important are the settlements which occur after construction is finished and all the dead and live loads are installed.
Define the time elements for these occurrences with precision.
7.
Explain the exact meaning of the expression " average measured settle-ment". Extreme values of settlements are as important, as the averagss. Provide these extreme values.
B.
3.0 Ccmoarisen of Predicted vs. Measured Settlements This comparison is important only as partial check en predictions and possibility to extrapolate for the entire life of the facility. Very important is also the assurance that the structures and all components, including electrical conduits and miscellaneous ducts can take the short range and long range settlements.
1044 225
Si
- Provide information relating to the consideration of tilting)or rocking (in two different directions for adjacent structures,
rotation about horizontal axes, rotation about a vertical axis and sliding.
Incl' de deformations-due to thermal gradients in soil, loss u
or gain of interstitial water, influence of seismic phenomena, floods, variations in underground water levels etc.
C.
4.0 Differential Settlements Across Structures 1.
Indicate the relationship in space between penetrations and bench-marks and discuss the possibility that the displacements of penetra--
tions may differ from the displace". ant of benchmarks.
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2.
Same reasoning applies to differential displacements between buried elements and soil.
Indicate the relationship of the six components of displacements: 3 translations and 3 rotations.
3.
It is stated (4.1) that the limiting value for settlement profile of 0.002 has been established. Justify this value by establishing that all components are able to operate as required when this limiting value is reached. Consider, as indicated above, a combination of 6 components of the displacement.
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D.
5.0 Penetration Differential Settlements This section is not complete.
1.
As indicated in the discussion above cover all pipe:, including valves, drains, electrical conduits, ducts, etc.
2.
Discuss the possibility that the displacements of penetrations differ from the displacement of the benchmarks.
3.
Provide detailed sketches of anchors and their location with' respect to penetrations and details of anchors proper.
Indicate whether each anchor can take moments, shears, and axial loads, or only one or two of these systems of loads. Discuss thermal loads on anchors. Discuss whether they are constituted of snubber-like devices. Discuss the safety margins provided by the anchors including the sum of all loads as provided by standard loading combination equations (including differential displacements).
4.
The stress criterion indicated in 5.1 and taken from the ASME Boiler and Pressure Vessel Code, Section 3, Sub-section NC-3652.3(b),1977, is too narrow:
it covers only non-repeated loads on piping. Provide additional criteria for at least the following cases, a.
sustained loads b.
dynamic loads 1044 226
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materials not included in ASME Code (drainage pipes, concrete, sheetmetal) d.
electric conduits e.
ducts f.
elbows 9
valves h.
connections in pipes, ducts, etc., especially welds, flanges and gaskets.
e e
1044 227
l MEETING WITH GEORGIA POWER COMPANY HATCH 2 SETTLEMENT OF STRUCTURES AUGUST 30, 1979 Georgia Power Co.
R. D. Baker Bechtel G. A. Kosi A. Sanver K. L. Khianey J. L. O'Neal J. R. Davie J. S. Gray, J r.
NRC D. M. Verrelli A. Gluckmann J. D. Kane 1044 22g
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'o UNITED STATES NUCLEAR REGULATORY COMMISSION g
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WASHINGTON. D. C. 20555
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Docket File V. Noonan NRC PDR G. Knighton Local PDR D. Ziemann ORB #3 Rdg P. Check NRR Rdg G. Lainas H. Denton D. Davis E. Case F. Pagano D. Eisenhut-R. Clark B. Grimes OELD W. Gammill 0I&E (3)
R. Vollmer S. Sheppard L. Shao Project Manager J. Miller ACRS (16)
T. Ippolito NRC Participants R. Reid M ERA A. Schwencer J. R. Buchanan 1044 229 e