ML20237K360
| ML20237K360 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 06/17/1987 |
| From: | PACIFIC GAS & ELECTRIC CO. |
| To: | |
| References | |
| OLA-I-SC-011, OLA-I-SC-11, NUDOCS 8709040311 | |
| Download: ML20237K360 (18) | |
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INTEROFRCE MEMORANDUM
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DiabloCanyon Project i 6(
.1(-( PACIFIC GAS AND ELECTRI W
Y BECHTEL POWER CORPORATION November 21, 1985 E. C. Connell g,,,
)
3 O
File No.
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From Spent Fuel Racks Review of Civil Engineering S "b'"'
Joseph Oat's Submittals O'
j 45/23/B34 8-0329 1
u Extension
Reference:
IOM from S. A. Johnson to J.K. McCall dated November 1,1985.
This is a complete response to the above referenced 10M.
We have reviewed drawing D-7776 Rev. O with DC #695034-66-01. We have the following coments:
) and rack
- 1/f" g"l d' Consjde_r_ing,thpJoley%' J g,$bejagpla3 f(.1,,p nces 1) and X c6u A
edge distances,_r.acks
% ave *0"'distancs be_thse,p.L
,_ bas,e p, late e ges'aii'unifiig 2A/4"T iis / r j
t r
o ia'mu#t 9 r bit eea the c,as-O i
~2" as permitted on drawing E-7702 Rev.1 with DC #695034-30-03 would not be possible. This could pose an installation problem.
The girdles bars, of racks H,N,_and_E,w{1Ly~ educe _the distaWg to f
2) thelpentTuel"Pobi~w~il'l*t'6dess than th,e postulate ~d'maximuni Meflectich4YWe~fi6k?."D6Teph7st.rshoul d ~iddres s and!verTYTthat
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'ths'aet0~6TdispTifeme#t~oT theseTaWH~6'thir3eg~. heFaTmodulf such""thattere Ts nTimTact~to the poo1~ wills I
Racks "H" and "J" are not included on this drawing. They should be 3) referenced to another sheet where these girdle bar and base plate projections are shown.
If you have any questions, please call A. Sudhakar on extension 8-4096.
[sr J. K. McCall Written Response Required:
No JKM/lpq cc:
KBarulich 45/10/D28 45/,10/028 p SAJohnson 45 23/A>7
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A00 RPM OAT CORPORATION
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Scott Sohnson j
Dave Ogden-i f
Pacific Gas and Electrio l
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FRON:
K.P. Singh j
Doseph Dat Corporation i
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thitTfector'Tof"istetyIofD.%over the outreme-eendition yound motios'~04eagri
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'. Earthquake fof%iablo~tanyon raoksPbe provided against rack overturning. / Although t.
the module layout in Diablo Canyon pool precludes rack overturning when the pool is j
fully populated with modules, the question of the available margin of safety when 6
only one module placed in the middle of the pool, (away from the walls) remains to e,
- Y be answered.'
Towards this end, the rank moduls with the worst aspect ratio (d x 11 module) was run with 1.1 times the Hosgri seismic excitation.
The module was loaded with fuel assemblies in one half parallel to its short aide (y. direction) producing an eccentrically loaded configuration with saximum rotation about the z. axis,_ ocupied with large vibrating inertial mass.
The results of the analysis show that the module experiences a maximax totation less than 3.01 degrees in the n-z plane, and less than 1.51 degrees in the.,
i y-r plane.
The rotations required to induce incipient tipping under static oonditions in x-z and y.x planes are 20.35 degrees and 19.18 degrees, respootively.
Thess results show that a large margin of safety against kihtic stability exists in all rack modules.
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i Please be advised that rock rigid body rooking frequency is less tha 10 Hz in all asses.
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JOSEPH DAT 00ftpORAT9098 a
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owewc4t snowarnsa memoamns j
,f notamonen connousms TO:
Scott 3ohnson Dave Ogden Pacific Gas and Electric
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FROM:
K.P. Singh 3osoph Oat Corporation 1
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The 0.T. position aper, by reference to the 5tandard Review Plan, stipulates that a f actor of safety of 1.
over the extremo condition ground notion (Hosgri Earthquake for
]
Diablo Canyon racks) be provided against rock overturning.
The module layout.in Diablo i
Canyon pool precludes rack overturning when the pool is fully populated with modules, 1
this response deals with the available margin of safety when only one module.placed in the middle of the pool, (away from the walls).
4 Towards this end, the rack module with the worst aspect ratio G [11 ' module) is run with 1.1 times the Mosgri seismic emoitation.
The u. axis is parallel to the short 4'
side and the y axis is parallel to the long side.
The x.y origin is at - the rack oenterline.
Two cases of eccentric loading are considered.
Both cases have SOE of the, oells filled with fuel assemblies.
Case 1 loads all fuel in the positive x half of the rooks Case 2 loads all fuel in the negative y half.of the raok. The following table
- wanarizes the results of the two' analyses.
Rotation in x-r_ Diane'. decrees Rotation in v.
plane. decrees Value for Factor Value for Factor Actual Intipient of Actual Incipient of Lead Case Maximax Tippinc Safety Maximax Tionine
__ Safety 1
0.56 19.36 U.4 1.15 35.94 31.2 2
0.77 11.14 27.4 1.26 33.M 24.5 in These results show that a large margin of safety against kinematio stability exists in all rack modules.
t Please be advised that rook rigid body cooking frequency is less tha 10 Hz in all oases.
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=Page 1.of 2 DIAN.O CANYON PROJECT NO CHRON p
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FILE DATE E. C. Connell, M. R. Khan, J. K.McCall, D.0ggdia, W.Tseng, S. Bha t ta cha rva. D. W. Doden /}>#7 PGandE-June 20. 1986 1:
JOB NO.
TIME D.Jeno. R.C.Nerrick NRC/FRC 11:05-12f05; f'
MMS OF DISCUESION l
PGandE provided the following response / discussion on the questions aske'd by.D.
Jeng and R. C. Herrick on June 19, 1986 during the 12:10-1:40 p.m conference.
call.
1.
The predicted maximum ground displacement at the Diablo Canyon' site due to the Hosgri earthquake (0.75g) is 8 inches, and the maximum velocity is i;ft./sec.
This information is contained in SSER 5 Appendix C (September 1986), which is a copy of information prepared by N. M.
Newmark.
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2.
PGandE has performed the integration of the acceleration time-history i
data provided to Dr. Ferguson and produced essentially identical results as those documented in Figures 1 and 2 (displacement' time-histories attached to Dr. Ferguson's affidavit in support of the Interveners' Motion for Stay, June 16, 1986).
It was emphasized.that the. residual displacements at the end of the time-history (24 seconds) are not representative of predicted displacements at the site, nor are they used-i in any way for design purposes.
I 3.
A lengthy discussion ensued on the conservatism in the synthetic i
acceleration time-histories used for design / qualification of the spent fuel racks and the method used for " clipping the peaks" (hhw much, when, p
how often, etc.) in the integration process.
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DIABLO CANYON PROJECT kk l
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The next discussion. focused on the frequency constant of the peaks'of the Li After much discussion, PGandE indicated that since lj Hosgri. time-history.
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- 1) the ground motion is filtered through the building and 2) the
'l fundamental frequency of the aux. building is greater than 13 Hz, the d
j j
range of predominant frequencies will be greater than 13 Hz.
(The actual j
J frequencies cannot be determined without performing a Fourier 1
decomposition.)
i i
j 5.
The girdle bars on rack H were discussed.
It was indicated that a.
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rack-specific analysis was not performed for the upper and lower girdle 3
bars on this module. The bounding rack impact loads, based :n the 10 x 1
11 and 6 x 11 modules with gap elements modeled at the upper bar location h
and the baseplate, were used to size and qualify the girdle bars on all
['
rack modules.
The basis for the judgment that impact loads on the lower girdle bars of rack H are bounded by the impact loads documented in the i
reracking report was discussed.
l l
Note: Attached to this telecon record is a brief summary of the issues j
i discussed; a copy of the attachment was sent to D. Jeng on Friday,.
l June 20, 1986 (as requested by the NRC Staff).
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$ 9 N 911 01CD3SIE pp //
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June 20, 1986 l
David Jeng:
As requested, the notes prepared by PGandE for the conference call between PGandE and the Staff (D. Jeng and R. C. Herrick) at 11:00 a.m. on Friday, June 20, 1986 are being sent to the Staff.
Also enclosed is a brief record of the telephone c0nversation.
0n AN David H. Ogden PGandE - Licensing
(
(415) 768-0164 Enclosures
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01 What is the maxinum ground displacement and the philosophy to develop i
this?
l 1
I ANS Appendix C of Supplement 5 to the Safety Evaluation Report (SER).
(September 10, 1976), discusses the rationale for development of the 6esign spectra for the Diablo Canyon Reactor facilities. Dr. N.M.
Newmark prepared this rationale as a consultant to the NRC. According to this report, the maxinum ground displacement is 8 inches and the maximum ground velocity is 24 in./sec. (table 1 page C-20). The
{
1 philosophy used in arriving ~at this value of maxinum displacement and
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l velocity is discussed in pages C-4 through C-6.
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[29/04) f 3-f
QUESTICN 2 Are the plot in Figure 1 & 2 provided in the Affidavit of Dr.- Richard B.
. Fergurson dated June 16, 1986 integrated. correctly?
Answer: We have integrated the tine histories provided to Dr. R. Fergurson.
and obtained similar results.
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[06/29)
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1 OUESTICN 3 Describe the basis for develognent and justify conservatism in the synthetic time histories used for this Fuel Rack analysis.
Answer: The synthetic design basis time histories for the Fuel Rack analysis were developed based on.the following;
Ibe acceleration response spectra of this time history envelop the '
required. floor response spectra.
'In addition for non linear analysis, it is our judgment that the maxima of the integrated velocity and displacement of this tame history l
l be greater than the design basis velocity (24 in/se) and displacement (8 in).
Refer to response to Question 1.
'Ihe synthetic time history as developed and used for the fuel rack analysis are conservative with respect to the above criteria in that
(
(1) the spectra of this tire history envelops the design basis response spectra (2) the maxima of the integrated velocities and displacements are 32 in/sec and 80 in. in the ER direction and 32 in/sec. and 18 in. in the NS direction, which are greater than the corresponding design basis value.
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[06/29) fp L
w cursrION 4 What is the expected range, of frequencies for the time histories at the pool?
. ANSWER: 'Ihe ground notion is filtered through the building. Thei funda". ental frequencies of the Auxiliary building are greater 'than 13 Hz-
' (as reported in Ref. 1).
Therefore, it'is expected that the range'of.
predaninant frequencies will be-greater than 13 Hz.
m t ue2CE 1. -
"'Itchnical Evaluation Report", Evaluation of Spent Fuel Racks Structural Analysis for Pasific Gas and Electric, Diablo Canyon Units 1 and'2, TER-C5506-625 dated April 30, 1986.
Prepared by Pranklin Research Center for the NRC, l
[06/29)
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