ML20053C678
| ML20053C678 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 05/25/1982 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8206020457 | |
| Download: ML20053C678 (5) | |
Text
south CAROLINA ELECTRIC & GAS COMPANY POST OFFICE BOX 764 COLUMBI A S. C. 29218 May 25,1982 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Cmmission Washington, D.C.
20555
Subject:
Virgil C. Sunner Nuclear Station Docket No. 50/395 Earthquake Instrumentation
Dear Mr. Denton:
In our May 3,1982, letter South Carolina Electric and Gas Cmpany described a change in location of the triaxial peak accelerograph located in the reactor building. A cm mitment was made to provide an FSAR revision to show the exact revised location. The attached marked up pages provide that information. They will be incorporated in the next FSAR amendment.
If you have any questions, please let us know.
Very truly yours, a
T. C. Nichols, Jr.
Senior Vice President Power Operations RBC:'ICN:lkb Attachment cc:
V. C. Sunner (w/o attach.)
G. H. Fischer (w/o attach.)
H. N. Cyrus T. C. Nichols, Jr.
(w/o attach.)
M. B. Whitaker, Jr.
J. P. O'Reilly H. T. Babb D. A. Nauman C. L. Ligon (NSRC)
W. A. Williams, Jr.
R. B. Clary O. S. Bradham A. R. Koon M. N. Browne G. J. Braddick
%l J. L. Skolds J. B. Knotts, Jr.
j B. A. Bursey j
NPCF fjl File 8206020457 820525 PDR ADOCK 05000395 A
4l The output of both triaxial sensor units (accelerotneters) is O
recorded by a recording and playback system in the control building.
A seismic trigger (see Figure 3.7-47) is provided at the reactor building foundation mat to start the recorder. An alarm is sounded when the recorder is started.
O 2.
Triaxial Peak Accelerographs One triaxial peak accelerograph is located at each of the follow-ing locations :
On the top of the steam generator, as shown by Figure 3.7-49.
a.
Od T HG" PRESSLi$t l1.E Ft 50RG G'
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b.
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On the residual heat removal system heat exchanger, (see c.
Figure 3.7-50).
Q 3.
Triaxial Response Spectrum Recorder One triaxial response speccrum recorder, capable of permanently recording peak response as a function of frequency for.both hori-zontal motions and vertical motion, is provided at each of the following locations :
Reactor building foundation mat outside the reactor building O
a.
(see Figure 3.7-47).
b.
Steam generator support (see Figure 3.7-51).
O
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4 On the intermediate building roof at elevation 463'-0" (see c.
Iigure 3.7-52).
D 3 Z-3.7-56 AMENDMENT X A" _,
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T ' l f N Sensing FSAR j
Ident.
Elemen t Figure Mounting Lowest Natural
)
No.
Description location Re fe ren ce Type Frequency of Mounting IYM-1788 Peak accelerograph Top of steam 3.7-49 Bolted to adapter 166 11:
l gene rator B, bracket inside reactor bh Pesssucitec Socce ode 46.8 J 3E IYM-1789 Teak accelerograph 4a
- m 3.7-49 Bolted to adapter 999-Hz
-vessel, Jins ide bracket reactor building (,*t)
IYM-1790 Peak accelerograph FJIR heat exchanger, 3.7-50 Eolted to adapter 255 Hz in tennedia te -
bracket building IYM-1785 Besponse spectrum Steam generator C, 3.7-51 Bolt ed to adapter 30.9 Hz recorder upper lateral plate-support, inside i
is reactor building-wA IYM-1786 Pesponse spectrum Intermediate-3.7-52 Bolted to
'(3) recorder building roof, concrete floor elevation 463' IYM-1787 Response spectrum Auxiliary building 3.7-53 Bolted to
'(3) recorder f oundat ion foundation NOTES:
1.
All listed sensing elements are triaxial sensors.
2.
Lowest. natural f requency, in three dimensions, of mounting bracket or plate.
3.
This irstrument does not use any bracket or plate as a mounting adaptor.
The instrument is bolted rigidEy to the concrete surf ace that it monitors.
The instrument is free from spurious resonances yyij p wirrirr its frequency range, a
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