ML18052A755
| ML18052A755 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/20/1986 |
| From: | Thadani A Office of Nuclear Reactor Regulation |
| To: | Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| RTR-NUREG-CR-1833, RTR-REGGD-01.084, RTR-REGGD-1.084 NUDOCS 8610300233 | |
| Download: ML18052A755 (3) | |
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October 20, 1986 Docket No. 50-255 Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49i01
Dear Mr. Berry:
SUBJECT:
MODIFiCATION OF THE PALiSADES PLANT SEISMIC DESIGN
.CRITERIA TO INCORPORATE ASME CODE -CASE N-411 In your letter.dated July 28, *1986, you ~ubmitted information regarding the imple~entation.of ASME C6de Case 411 into the seismic a~alysts of piping systems at t_he Pa 1 i sades Pl ant.
A 1 though not requ.(red, you_ provided this information as a result of your reques,t for clari{icalion'from ihe NRC staff of the conditions on;this Code Case as stated in Regulatory Guide.1.84, Revision 24, an*d the guide 1 i nes deve 1 oped by *the NRC>> s tatf for the applicability of,th1s Code Case. *The purpose of this,letter is to provide our comments on the submitted information..
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ASME Code Case N-411 prescribes mooa 1 damping va.1 ues v*aryi ng from a maximum of __ 5%-to a minimum of 2%* in the~.r*ange 0of"IO\\Hz to 2.0 Hz.-~.i:hi*s:*
requires that the corresponding res pons~ spectra.from: 5% to 2% be*, -..
avai 1ab1 e.
CPC c_ommitted.. to use the' response* spectra;, deve.l oped by_ ~the Livermore National Laboratory in NU_REG/CR-:-l.{333.* Howeyer, :fh~.spec:t.raT curves in.this report.are shown 011.ly ~3~,' 5% '_,ang ?~*
~$,ince\\th.~ 2%. curves,:
are n.ot a.'1:ailable, CPt would be requjred.*to gener'ate these-curves; by_,,.,-*~
using a time histofy analysis or*by*extrapol~t.ing from the*ay~ilabTe.
- curves.. CPC stated that they are curre"ntly e.valuating the feasibi.lity of
- generating the 2% spectra directly.. Un_tn:--the tfme t~'e/2% spectra_ are generated, CPC intends to. emp 1 oy the NUREG/CR-18~*3 ~p.e'ctra with. 3%.
damping.beyond 10 Hz.. The justificatic;>n fo.r -this is *that 'for th~~e_.;*>~
- spectra* there is not expected to be'"niuch.djfference betwee~ the '3%:;an~_:':.2%
.. spectra in the range between 16.to:. 20-*Hz._
(J;he' spectra betweer:i_;5%'and.:.3%
are appl.icabie in the rarige 10 to 16 Hz}.** An examination.by tt:ie'~taff.of the spectra 1n"*NUREG/CR-1833-indica:tes that all spectra at* any given*-
e 1 evation converge to the zero period acce 1 erat ion (ZPA) at 20 Hz.* The 2%.
nominal spectra were constructed. by extrapolation of the 7%, 5% and 3%
spectra in the range ~f _ l0-20 Hz.* Between 16. and 20 Hz there is indeed Jittle difference between the 2% and 3%. spectra.
Therefore, for the case of Pa 1 i sades, the* intention by CPC to use the 3% spectra instead of the 2% spectra from NUREG/CR-1833 is determined. to be.reasonable.
Mr. Kenneth *
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As required by our guidelines, CPC also has stated (page 5) that jt intends to 11 r~view the impact of higher ~odes (greater than 33 Hz) as contributing to overal 1 response a11d interpret any potent i*a 1 response in
-terms of the modal effective mass* fraction.
11 This intention is necessary.
but not sufficient.
We require that the effects of higher modes be
.specifically included in the arialysis for determinin~ th~ seismic response of any piping system.
cc:
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TWambach; cf 10/.20186 Sincerely, Original signed by{.
Ashok Thadani Ashok C.
Thadani~ Director PWR.Project Directorate #8
- Division of PWR Lic'ensi.nQ:-B
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-7 Mr. Kenneth W. Berry Consumers Power Company cc:
M. I. Miller, Esquire Isham, Lincoln & Beale 51st Floor Three First National Plaza Chicago, Illinois 60602 Mr. Thomas A. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue.
Jackson, Michigan.49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Jerry Sarno Township Supervisor Covert Township.
36197 M~140 Highway Covert, Michigan 49043 Office of the Governor Room 1 - Capitol Building Lansing, Michigan 48913
-Palisades Plant ATTN:
Mr. Joseph F. Firlit Plant* General Manager 27780 Blue.Star Memorial Hwy.
Covert, Michigan 49043 Resident Inspector c/o U.S. NRC Palisades Plant 27782 Blue Star Memorial Hwy.
Covert, Michigan - 49043
_Pali sades Pl ant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiol~gical Health P.O. Box 30035 Lansing, Michigan 48909