ML18031A191
| ML18031A191 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 06/06/1979 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| References | |
| NUDOCS 7907190799 | |
| Download: ML18031A191 (4) | |
Text
Distribution w/enclo e:
Docket File lilliams NRC PDR
- 0. Parr Local PDR S. Miner LHR 83 File M. Rushbrook R.
Boyd R. Mattson
- D. Vassallo
. D. Ross Docket Nos.
5O"3B7 J.~Knight and 5O 3BB R. Tedesco R.
DeYoung V. Moore 0
b)r. Norman 1<. Curtis Vice President - Engineering and Construction Pennsylvania Power and Light Company 2 North Ninth Street Allentown, Pennsylvania 181(1 R. Vollmer M. Ernst R. Denise R. Hartfield OELD IE (3)
F. Cherny J. Kiessel R. Stevens
>W Oe >9M BCC:
JBuchanan TAbernathy ACRS (16)
Dear Mr. Curtis:
SUMECT:
SUS(UEHANNA STEAM ELECTRIC STATION UNIT NOS.
1 AND 2-REQUEST FOR ADDITIONAL INFORMATION As a result of our continuing review of your application for operating licenses for the Susquehanna Steam Electric Plant, we find that we need additional information in the area of Mechanical Engineering.
The specific information required is listed in.the Enclosure.
Please inform us of the date when this requested additional information will be available for our review.
4 I
Please contact us if you desire any discussion or clarification of the information requested.
Sincerely, 0ripirnl Signed b'g Q. D,'.Parr, Olan D. Parr, Chief Light Hater Reactors Branch No.
3 Division of Project Management
Enclosure:
As Stated cc w/enclosure:
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Mr. Norman W. Curtis JUPE 06 lgZS cc:
Mr. Earle M. Mead
, Project Engineering Manager Pennsylvania Power 8 Light Company 2 North Ninth Street Allentown, Pennsyl vania 18101 Mr. Robert J.
Shovl in Project Manager Pennsylvania Power and Light Co
~
2 North Ninth Street Al 1 entown, Pennsyl vani a 18101 Jay Si lberg, Esq.
- Shaw, Pi ttman, Potts 8
Trowbri dge 1800 M St rect, N.
W.
Washington, D. C.
20036 Mr. William E. Barberich, Nuclear Licensing Group Supervisor Pennsylvania Power 8 Light Company 2 North Ninth Street Al 1 entown, Pennsyl vani a 18101 Edwa rd M.
Na gel, Esqui re General Counsel and Secretary Pennsylvania Power 8 Light Company 2 North Ninth Street Allentown, Pennsylvania 18 101 Bryan Snapp, Esq.
Pennsyl vania Power 8 Light'ompany 901 Hamilton Street Al 1 entown, Pennsyl vani a 18101 Robert M. Gallo Resident Inspector P. 0.
Box 52 Shickshinny, Pennsyl vani a 18655 Susquehanna Environmental Advocates c/o Gerald Schultz, Esq.
500 South River Street Wilkes-Barre, PA 18702 John L. Anderson Oak Ridge National Laboratory Union Carbide Corporation Bldg. 3500, P. 0.
Box X Oak Ridge, Tennessee 37830 Alan R.
- Yuspeh, Esq.
Shaw, Pittman, Potts 8
Trowbridge 1800 M Street, N.
W.
Washington, D. C.
20036 Dr. Judi th H. Johns rud Co-Director Environmental Coalition on Nuclear Power 433 Orlando Avenue State
- College, PA 16801 Mr. Thomas M. Gerusky, Director Bureau of Radiation Protection Department of Environmental Resources Corwonwealth of Pennsylvania P.
0.
Box 2063 Ha rris burg, PA 17 120 Ms. Colleen Marsh Box 538A, RDP4 Mountain Top, PA 18707 Mrs. Irene Lemanowicz, Chairperson The Citizens Against Nuclear Dangers P.
0.
Box 377 RDbl
- Berwick, PA 18503
110. 0 MECHANICAL ENGINEERING BRANCH 110.54 (3.7a.3.6)
(RSP) 110.55 (3 7a 3 7)
(RSP) 110.56 (3.7b.3.7)
The second paragraph of Section 3.7a.3.6.1 (first full paragraph on page 3.7a-l5) indicates that the seismic design is base) on the largest absolute value of the algebraic sum of one horizontal response and the vertical response.
(i.e., the larger of Jx+yJ or Jy +
zJ )
It is the Staff's position that this may lead to non-conservative
.'results because of opposite signs tending to cancel each other when
,not justified on a time history basis.
Therefore, the appropriate method should be to use the largest value of the sum of the absolute values of one horizontal response and the vertical response.
(i.e.,
the larger of Jxl + Jy J or )yJ4 JzJ)., Provide a commitment to meet this position.
Section 3.7a.3.7 (page 3.7a-l5) indicates that all modes are combined using the SRSS method when the response spectra method of modal analysis is used.
\\
, It is the Staff's position that this may lead to non-conservative results when dealing with closely spaced modes.
Several acceptable procedures for combining modal responses, when closely spaced modes are present, are contained in Regulatory Guide 1.92.
Provide a
commitment to meet.the procedures in RG 1.92.
The second paragraph of Section 3.7b.3.7 indicates that modal responses wi 11 be combined in accordance with Section 5.2 of BP-TOP-l, Rev. 2.
This referenced topical report has not been accepted by th'e Staff and a later revision (Rev. 3), which revises Section 5.2, is currently under review by the Staff.
Therefore, to eliminate any possible confusion as to the. method(s) used for this plant, it is requested that you clearly indicated the method(s) of combining modal responses which were used.
~ Your attention is also directed'to guestion 110.55.