ML19329B181
| ML19329B181 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/17/1975 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001300778 | |
| Download: ML19329B181 (3) | |
Text
.
'.l NP./; ^STRIRUTION FOf t i' ART 50'DOCP MATERIAL 6
(TEUIAURAR Tditi.1)
~
CONTROL NO d/
^')
/.'
j
,' /.
FILE:
dison Co.
lj.
FROM:
DATE OF DOC DATE REC'D LTR TWX RPT OTHER Sowell E. Roe 12-17-75 12-22-75 XXX
~OTHER SENT1:cc PDR
-- TO:
ORIG CC A. Schwencer 1 Signed -
SENT LOCAL PDR m _.
CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NC:
XXXX 1
50-346-DESCRIPTION:
ENCLOSURES:
^
Ltr. re our Ltr./ 11-14-75....Trans the following.
Information concerning protection against tornado missiles.... Submitting info.by 12-19 instead of..date of 12-5-75....
^
( 1 cy. Encl. rec'd) ~
PLANT NAME: Davis Besse
~.'
. 's
/
FOR ACTION /iflFL AMAT;ON vcR 12-29_L5 GU TLER (L)
/CHWENCER (L) ZIEI.iANN (L)
REGAN (E)
REID(L)
W/ Copies W/gCopies W/ Copics W/ Copics W/ COPIES CLAhKtL)
STC LZ (L)
DICKER (E)
LEAR (L)
W/ Copic W/ Copics jW/ Copics W/ Copies PARR (L)
VASSALLO (L)
V::N!GHTON (E) can;3 W/ Copics -
W/ Copics W/4Copics -
W/ Copics KNIEL (L)
PURPLE (L)
YOUi1GBLOOD (E)
Lim W/ Copics W/ Copi;s W/ Copies W/ copies INTERNAL DIST RiBUTION i2 TECH REVIEW DENTCN L!C ASST A/T IND.
dRC PUR SCHROEDEli GRIMES R. DIGGS (L)
BR AITM AN OGC, ROOM P 50EA MACCARY GAMMILL H. GE ARIN (L)
SALTZMAN GOSSICK/3T AFF KNIGitT KASTNER
/ GOULOOURT.'E (L)
ME LTZ CASE PAWLICKI P A LLA RD P. KREUTZER (E)
SHAO SPANGLER J. 1. E E (L )
PLANS vtOYD STELLO TA. kUIllm07.'.(L)
JGCDONALD MiGOR E (L)
HOU3 TON ENVIRO S. REED (E)
CHAPMAN DEYOUNG (L)
NOVAK
/UU LLE R
- M. SERVICE (L)
DUGE (Ltr)
SKOVI!OL'l (L)
ROSS DICKER S. SilEPPARD (L)
E. COUPE GOLLER (L) (Ltr)
IPPO LITO KNIGitTON
/A. SLATER (E)
PETERSON P. CO LLINS TEDESCO
,,.. YOUNGB LOOD H. SM!Til (L)
HARTFIELD (2)
DENISE J.COLLu;c REGAN S. TEE !S (L)
KLECKER p.llE.G_O M LAINAS PROJECT LDR G. WI LLI AMS (E)
EISENHUT FILE & REGION (2)
B E N A II O Y A
[M V. WILSON (L)
WlGGINTON 1:1?C VOLLMER H &#ESS R. INGR ' t1 (L)
M._ DU::CAU (fj K. PA"RICI (L) o EXTf riNAL DISTRICUTION
/>
. _ _ _ _- LOCAL PDR[dMOM 1 - TIC (Anr.RNATilY) (1)(2)(10) - MATIONAL LAGS 1 - PDR-SAN /LA/NY 1 -- NSIC (E UCllANAN) 1 - W. PENNINGTON, Rm E.201 GT 1 - CROOKil AVEN N AT LAa 1 - ASLB 1 - CONSU LTANTS 1 - G. ULRl! EON ORN L 1 - Newton Anderson NEWM ARK /Bl.Ui.1E/AG GAG! AN
- ACalS-liULDING;SENT 400130GTJ M
s REG,LIL=wnu 1
'com ZLE COP.r w"
TOLEDO EDISON
-:[
Docket No. 50-346 LOWELL E. ROE m
f v.c. %.:o.a.
's-4 5.cias, o
,fi N
' /,,
8 58-58'8 Decembr.r 17, 1975 e atu_'
3, 4&
4
..at
.?'.;
J y
- , ~,Cs.ola h
h Director of Nuclear Reactor Regulation g,
gg Attention:
A. Schwencer, Chief f/
Light Water Reactor Branch 2-3 OJCg p z,
Division of Reactor Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
~ '. -
gr..
Dear Mr.Schwencer:
\\j Enclosed is the information concerning protection against tornado missiles as requested in your letter dated November 14, 1975. As discussed with your Licensing Project Manager, Mr. Leon Engle, on November 26, 1975, this information is being submitted by December 19, 1975 in lieu of meating your requested deadline of December 5, 1975.
Yours very truly, jm b/1 Attachment 14101 THE TCLECO EDISON CCMPANY EDISON PLAZA 300 MADISCN AVENUE TCLEDO. CHIO 43652
- ~
\\s Davis-sesse - 1
Response
s 1.
Roof and es:terior wall minimum thicknesses (inches) for Class I structures are shown in Table I.
Table I
~ Class I Structure Roof
- Wall Shield building 24 30 Emergency lock enclosure 18 15 Auxiliary building 18 24**
Intake structure 21 24 NOTE:
- All roofs are above 30'-0" except the emergency lock enclosure which is 12'-6" above ground.
All Class-I exterior walls are 24 inches thick except one section of wall of the Diesel Generator Building, which is 18 incher, thick.
For Missile F below 30 feec elevation and Missile C for all elevations, the approximate velocities below which penetration and the generation of secondary missiles is not calculated to occur are show in Table II.
Table II Velocity (ft/sec)
Missile 15" 18" 21" Missile Description Concrete Concrete Concrete
+
Steel Bod, C
1" dia. x 3' long 300 192 335 220 369 247 wt 8 lbs.
Utility Pole, F
13 " dia. x 35' long 300 127 333 146 366 164 wt 1,490 lbs.
NOTE:
- Velocity below which penetration does not occur.
Velocity below which generation of secondary missiles does not occur.
The Bechtel topical report, BC-TOP-9A, Revision 2, Septsmber 1974 was used to arrive at the velocities given in Table II.
2..
Separation cf redundant components has not been relied on for tornado missile protection. Systems vital to safe shutdown are enclosed in Class I structures ahich have been designed to withstand the tornado missiles given in FSAR Table 3-4.
--.