ML19319A692
| ML19319A692 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/23/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7911210653 | |
| Download: ML19319A692 (5) | |
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7 We are, reviewing your submittal.' dated October' 7,'1975.~ wiiichl'N ^ C. ' - '
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This information was. submitted to suppoit M ' ~ YMeu switchyard at Oconee.
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our safety evaluation for Amendments Mos. 27. 27, and 24 fbr d
T Facility Operating Licenses DPR-38,;DPR-47.'and fd;L556.datedl N '.V - Y i
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50 and Duke Porter Company ATTri: '!'r.. Willia: 0. Parker, Jr.
~Vice President - Steam Production Post 10ffice Sox-1278.
'422 South Church Street Charlotte, llorth Carolina ' 28242 Gentle:cen:
h'e are reef ewing your subnittal, dated 0:tober 7,1975, v:hich
- e provid:d in+ormatica identifyi 4 the detail: cf ti:e ::.ist.:ic desien of.ae. overtend emrt:ncy pat::r path thre'ed) tSc 2:40 N suitchyan! at 0:ca:e.
Th4 inerratian was r.utitted '. suP;3rt-our scitcy cvaluatics for /. rand inir.:3. 27, 27, and I.4 fce-Pscility Operating 1.ictr.u.3 D:it-2, DV-c./, c:.d DPME. dated Junt 's0, 19,5.
!!e find that Ecfor t.c ca.1 cercpler.c ocr rni2u, additi:.r.s.1 info; -
mation es indi:sted in ti:2 ene':sure, is nt:e rary.
h is rr. quested that you r,ravide the inferr.ution.tithin 45 c;;/s-of
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Sincerely,,
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Operating P.se.ctors Brr.nch il-Division of Operating Res to;s Enclosucc:..
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r-4 OCONEE NUCLEAR STATION UNITS NOS. 1, 2 6 3 SEISMIC CAPACILITY OF EMERGENCY POWER PATH REQUEST FOR ADDITIONAL INFORMATION 1.. For each of the structures indicated in Table I, describe foundation condition i.e, soil or rock, indicate how soil-structure interaction was accounted for, discuss what precautions were taken to stabilize
\\bereapplicable,providetheinputresponsespectra, 6
the fill soil.
indicate the damping values and the extent to which a three directional earthquake was considered for the design and discuss the load combinations investigated.
Describe the, dyna =ic model of the transmission line and the towers.
2.
Indicate how the relative displace =ents of the ground betveen the towerz during a seismic event are accounted for.
Identify the critical sections on the transmission line, the towers and their foundations and provide a stress su==ary co: paring the stresses against.the acceptance criteria citing the applicable codes.
3.
Describe the dynamic model of the 230 kvSwyd Relay House and provide the floor response spectra for different locations at which Category I equipment are supported.
Identify the critical sections and provide a stress su==ary comparing the stresses against the acceptance criteria from applicable codes.
4.
Provide the dynamic'model of a typical transformer in the overhead emergency power path including its foundation.
Discuss the methods used to seismically qualify the fan coolers mounted on the transformers to ensure operability during and after a seismic event.
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Provide a copy of a typical equipment procurement specification and discuss the extent and the manner in which the dynamic loads from SSE and OBE were considered by the supplier to qualify the sub-jact equipment.
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6.
On Table 2, identify clearly,for each of the items qualified by a combination of test and analysis, the portions which were qualified by analyses, and the portions thich were qualified by tests.
Provide some typical results for the qualification program for the 230 KV Power Circuit Breakers (PCB) and supportive equipment.
7.
For items or portions of items qualified by analysis provide the following information:
a.
State whether the analysis method was static or dynamic, and justify your selection.
b.
Provide a diagram of the math model used for each equipment item.
c.
Provide in ot loads used in the analysis and point of application.
r d.
Show location and magnitude of the highest stress intensity and deflection, and list the corresponding margins of safety, e.
Verify that the operability of each equipment item was considered in your analysis and provide a discussien on how the calculated deflections were considered in relation to the operability of the component.
f.
Define the acceptance criteria used in the operability analysis.
8.
In view of the size of the emergency power path, provide a discussion on detailed inservice inspection and maintenance program to ensure in-tegrity and serviceability of the structures and equipment incorporated in the emergency power path.
Parameters required to be monitored, for example, may be the tension in overhead cables or deflection of towers.
Indicate your. intent to incorporate the proposed inservice inspection and test frequency in the technical specifications of the three nuclear power plants. -
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