ML13317A418
| ML13317A418 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/22/1982 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8211240156 | |
| Download: ML13317A418 (7) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 K. P. BASKIN November 22, 1982 TELEPHONE MANAGER OF NUCLEAR ENGINEERING, (213) 572-1401 SAFETY, AND LICENSING Director, Office of Nuclear Reactor Regulation Attention:
D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 Anchorage of Electrical Equipment San Onofre Nuclear Generating Station Unit 1 SCE's evaluation of the anchorage of safety related electrical equipment was discussed with the NRC at a meeting on July 28 to 30, 1982.
Subsequent to that meeting, the NRC staff requested clarification of the extent to which portions of equipment were included as part of the anchorage mechanisms which were evaluated. The purpose of this letter is to clarify the limit of the evaluations.
The basic principle of the reevaluation program for equipment anchorage was to ensure that the mechanism by which the equipment was attached to the supporting structure was capable of resisting the seismic induced loads while remaining within the criteria stress limitations. The definition of what comprises the anchorage mechanism is: those elements required to transfer the loads between the overall equipment boundary (i.e. cabinet or panel outline) and the supporting structure. As shown in the attached three figures the scope included not only the connector (bolt or expansion anchor) to the supporting structure but the channel or angle which receives the connector and it's (the channel or angle) connection to the cabinet or panel.
The inclusion of the connection between the cabinet and the connecting angle is best shown in Figure 2 where the 1/4" plates were added to the depicted cabinet as part of the anchorage reevaluation program. Therefore, it is assured that the anchorage to the supporting structure and it's connection to the equipment itself satisfy the reevaluation criteria when subjected to the reevaluation loading conditions.
If you have any questions on this information, please let us know.
Very truly yours, 8211240156 821122 PDR ADOCK 05000206 P
7"
/0" o
//
CA8NET Li//T OF ANALYS/S Ile 95 A 307 7OLT 7(TYP) cIANVet Crv g
SEC 7/
ON PLAN SAFE GUARO LOA D 5EGa UENC/NG SYSTE/1M
/
AND 2 TYPICAL CAS/NET ANCHORAGE FIGU/RE
/
TYP 2!3
/ 2!3 (CA
/NET L/MIT OF AAJsiL YS/4
/4L H3EL 2 (TrYP)
,Y PL 4 (YP S
EC T/ON PLAN H/V CONTR OL LARD A/N CAS/NET T YP/CA L CA 6/NAE 7 ANCHORAGE FIGURE 2
9/4t 3OLT C.5x.7 (rYP)
L/A/i T F ft Ab4AL YSIS C 5xc$.7 L/f/ Or AJ4 L YS/9 3/ 4 CON2C FAST 4
4
.mJ ELEVAT/OA/ CA8/AET C-$/
SECT/OA/
W' BOLTS GUSSET /PN
=
2-i"4o80Trs T YP/CA L PA AEL ANC-/ORA6E FI6/RE S SECT/OA SECT/O/l CF
8/4 iSOLT r C. 5x G.7 TYP)
L/M/ T OF
/A/AL YSIS L4 14"0 CON c AST
-ELE VA T/OA/ CA8/1NET C-fo/
S EC T/O A/
2 -
e 48OL Ts sor rs T~ YP/C4 L PANEL ANC-/R G
r/SUR E3 SE CT/ON S SE C T/O /
./
- 3 CA65/NE7 L/I/
OF AI"A/L YS/SY k1'O O 6 L 3 2(7YI)
I I
7 YP)
SECT7/ONA PLAN H/V CON TR OL 5OARD A/A/N CAS/NE T 7 YP/CA L CA/A/E 7 A NCHOAGE F/G/RE 2
7
/0"
/0"
/0 CA8/NET LIMIT OF ANAL Y5/S
_~
4 307 OL TS (7YP)
C'ANwEL cr10 SECTI/ONA SAFE G6./A RD LOAD 5E E1/VC/NG SYS 7&EM
/
AND 2 TYPICAL CA/TE 7 ANCA/ORAGE F/GURE
/