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{{#Wiki_filter:* * -!AME!!' MUNICIPAL UTILITY DISTRICT D 6201 S Stmot, Bo> 15830, Soommooto, C*llfoml*
{{#Wiki_filter:-
95813, (916) 452-3211 March 7, 1980 Director of Nuclear Reactor Regulation ATTN: Mr. Robert W. Reid, Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555  
                                  *                                           *
  !AME!!' MUNICIPAL UTILITY DISTRICT D 6201 S Stmot, Bo> 15830, Soommooto, C*llfoml* 95813, (916) 452-3211 March 7, 1980 Director of Nuclear Reactor Regulation ATTN: Mr. Robert W. Reid, C~ief Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555


==Dear Mr. Reid:==
==Dear Mr. Reid:==
On October 17, 1978, the District provided you with specific design details for the construction of cable tray fire stops in the reactor building.
 
Your December 14, 1978 letter to the District approved the design. Due to installation problems, the District modified the design. *The modification was to extend the marinite board on the bottom of the tray 3 inches from the center of the fire stop instead of five inches as cated in our October 17, 1978 letter. Attached Figures One & Two indicate the modifications.
On October 17, 1978, the District provided you with specific design details for the construction of cable tray fire stops in the reactor building. Your December 14, 1978 letter to the District approved the design. Due to installation problems, the District modified the design.
The modification does not affect the ability of the fire stop to perform its function.
  *The modification was to extend the marinite board on the bottom of the tray 3 inches from the center of the fire stop instead of five inches as indi-cated in our October 17, 1978 letter. Attached Figures One &Two indicate the modifications. The modification does not affect the ability of the fire stop to perform its function. No other changes in the design described in our October 17, 1978 letter have been made.
No other changes in the design described in our October 17, 1978 letter have been made. The NRC resident inspector will not accept the present design of the fire stop until your approval is received.
The NRC resident inspector will not accept the present design of the fire stop until your approval is received. The District is committed to have all fire stops installed and approved by the end of the refueling outage. To prevent any delay in plant start-up, please review and approve the modified design by March 13, 1980.
The District is committed to have all fire stops installed and approved by the end of the refueling outage. To prevent any delay in plant start-up, please review and approve the modified design by March 13, 1980. If you have any questions or comments, please have your staff contact Robert Daniels immediately at (916) 452-3211, Ext. 613. Attachments Sincerely, dhn Mattimoe Assistant General Manager and Chief Engineer ffoo3/3D f:J{,7 t7JOQ%JJI I){o 7 A N E L E C T R I C S Y S T E M S E R V I N G M 0 R E T H A N 6 0 0 , 0 0 0 I N T H E -A R T 0 F C A l I F 0 R N I A   
If you have any questions or comments, please have your staff contact Robert Daniels immediately at (916) 452-3211, Ext. 613.
. . "I \ .  
Sincerely, ClLj~
**. MAR I t-11 TE D '' (TYP.) F'LDOR OR WALL OPHlll-JG FA5THJ BOARD TO i="LOOR OR WAia.WiTH NELSON STUDS ( 1/4"-20" 1 1/z" ) WITH ll.IUT..-VASHE"R OR HILTI STUD. KWll<-e,6LI OR ).JAIL AS FIE:LD COIJDITIOIJS DIC.TATE;:..
dhn J~ Mattimoe Assistant General Manager and Chief Engineer Attachments ffoo3/3D f:J{,7               t7JOQ%JJI ~Jr,~" I){o7 AN  E L E CT R I C S YS T E M S E RV I N G M 0 RE  T HAN 6 0 0, 0 0 0   IN TH E - ~~E A R T 0F CA l I F 0 R N I A
MARllJITE E>OARD (TOP SIDES) TYP. <;> 0 0  
 
..*  
  .. "I \ .
.. .. : ..  
r{:r~ ~~t! **. *~ ~,. ~/41 MAR It-11 TE ~OAR D FA5THJ BOARD TO i="LOOR OR WAia.WiTH NELSON STUDS ( 1/4"- 20" 11/z" ) WITH ll.IUT..-VASHE"R OR HILTI STUD. KWll<- e,6LI OR ).JAIL AS FIE:LD
..*  
''                            (TYP.)                                  COIJDITIOIJS DIC.TATE;:..
..  
F'LDOR OR WALL OPHlll-JG                                              ~/4' MARllJITE E>OARD (TOP SOT.~ SIDES) TYP.
.* *  
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                                                                                                                                            ..*       .. ..:..            ..* ..                  .**
HDLES EACH LEGi.
                                .~, ._);~;: : = * :::i:::=,-------1--------:-----,=~=o:=; ~;;~:'"
I 0 TRAY 11., .. I L_ ----------------
CA@1L&#xa3; TRAY f                                                                      **.
-_.J Y4'' IMLTS NUT.5 L 0 ___ +-____ 0 ________ 0 ___ --t:-----...... o (2
3 "x 3 A IJ GLE -f--:..+--.lq '-"~th.~~:zz:<!ZZ:z:z:z:z:z:::z:;1:Z:2::zz:z:z:~~~-H---1..
TRA'( WIDTH + I  
11 TRAY                                                            .,
+/- Y5" Top V1Ew  
2'RAC.KET WITH 2-9/32"4> HDLES o    I I
-
0   \-IEl~HT ~s; 11
WITH . $EMCO PR 8?? CUT Ctosi;.
                                                                                                                                                                                              .
SPACE 11-J 1Rti....f  
EACH LEGi.                                   L_     ----------------                                   - _.J ATTAC~          WIT~
#i.
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A\:TE.R I NSTALLATIOl-.1 QF SILllOl-lE.
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FOAM (T''f P. l?OTH E.1-lDS) S1DE VlEW CA&Lt Tl<A'(
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10/11h'O 1...tETTf:t?.
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Y2" WIDE:
FLOOR OR WALL
STL. (T'<P. 4 PLAC.E5) " ,, ',, ' l='J <;> .JD * ' FLOOR OR WALL REACTOR BLDG. CABLE TRAY FIRE STOP ATTACHMENT 1 10-1z.-1a   
                                                                                                      ",,
. ***l" : .. ..,. __ . !I PPORT BOARD FROM E."X-15111.JG e .
                                                                                                    ',,
TRA'{ SUPPORTS WI-IE.RE POSS! BLE ';/4" MARllJITE BOARD . (TOP, BOT. 4 51DE.5) T't'P. %r'' MAR HJ IT E BOARD (TYP.)  
                                                                                                  ' l='J <;>
.*
                                                                                                          .JD *
f:d_
                                                                                                        '
___ -t--s:=i=== GAP _I MAY.I MUM TRAY -o" 3"x. 3" AIJGLE. e>RACk'.ET w/ Z-9/3z"4' f.IOLES EACl-4 LEC.. ATTACl-l WIT\-! l/4 11 BOLTS N LITS W/ ( 1.
::;;:''.'~ -
S EArn S lDf:") CA1GL&#xa3; TRAY END VIEW
FlLL~Vl>lD' WITH SILlCO~E
* OR TO WALL IF Ll:SS OR TO BOTTOM D!= TRAY ABOV&#xa3; 12." IF TRAY 15 VERTICAL OR TO TOP OF TRAY BELOW FILL VOID WITH S\LIC0"1E FOA.M -5EMCO PR CUT DAM TO CLOSE. OPE"1 SPACE TRAY REMOVE AFTE!< l\....lSTALLATlOkl OF 5\LICO\.IE FOAM. (TYP. e:,ofH  
                        . FO~ ~ $EMCO PR 8??
*-------'Lz.:_WHi&"-S1Alf.J-bE55-5".fEE*b  
CUT     DA~ T~              Ctosi;. OPE~    SPACE 11-J 1Rti....f       #i. ~EMOV~    A\:TE.R I NSTALLATIOl-.1 QF SILllOl-lE. FOAM (T''f P. l?OTH E.1-lDS)
'C>Af.JDS (i'<P. 4 PLACES) CUT TD FIT AROLIWD U\..JISTRUT SUPPORTS AS C,, A l>I 1$ Ci> S It'll f..G 1 o ; , .., / 7 e 1_. r: ,, ti 12. , ,, . _. _ :?:**. R[ACTOR BLDG. CABLE TRA'(  
S1DE VlEW REACTOR BLDG. CABLE TRAY FIRE STOP 10-1z.-1a ATTACHMENT 1
'STOP ATTACHMENT 2 10-12-78}}
 
  . :***l" t~ ..
          ..,. __ .
PPORT BOARD FROM E."X-15111.JG
                                                                    ~ISTRUT    TRA'{ SUPPORTS e.
WI-IE.RE POSS! BLE
                                                                ';/4" MARllJITE BOARD
                                                              . (TOP, BOT. 4 51DE.5) T't'P.                               %r'' MAR HJ IT E       BOARD (TYP.)
                                                                                                                                            -~:,{~~--~- .*
                                                        !I j_~__:
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( 1. PLAC~ S EArn S lDf:")
* OR TO WALL IF Ll:SS
                                                                                                            ~O~    OR TO BOTTOM D!= TRAY ABOV&#xa3; END VIEW                                    12." IF TRAY 15 VERTICAL
                                                                                                          *~:;(-    OR TO TOP OF TRAY BELOW FILL VOID WITH S\LIC0"1E FOA.M - 5EMCO PR B5~
CUT DAM TO CLOSE. OPE"1 SPACE I~ TRAY ~ REMOVE AFTE!<
l\....lSTALLATlOkl OF 5\LICO\.IE FOAM.
(TYP. e:,ofH ~1-.!DS)
*-------'Lz.:_WHi&"-S1Alf.J-bE55-5".fEE*b
                                  'C>Af.JDS (i'<P. 4 PLACES)
CUT TD FIT AROLIWD ~~lSTllJG U\..JISTRUT SUPPORTS AS   R~QUIRED,                                                                  C,, t~ A l>I ~ 1$ Ci> S It'll f..G 1o  ; , .., / 7 e       1_. r: ,, ti 12. , ,, . _. _
:?:**.
R[ACTOR BLDG. CABLE TRA'( ~\RE 'STOP ATTACHMENT 2                                                                   10-12-78}}

Revision as of 14:32, 21 October 2019

Forwards Mods to 781017 Design Details & Diagrams for Const of Cable Tray Fire Stops in Reactor Bldg.Mod Does Not Affect Ability of Fire Stop to Perform Function.Requests NRC Review & Approval
ML18082A016
Person / Time
Site: Rancho Seco
Issue date: 03/07/1980
From: Mattimoe J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Reid R
Office of Nuclear Reactor Regulation
References
NUDOCS 8003130567
Download: ML18082A016 (3)
v • d • e


Text

-

  • *

!AME!!' MUNICIPAL UTILITY DISTRICT D 6201 S Stmot, Bo> 15830, Soommooto, C*llfoml* 95813, (916) 452-3211 March 7, 1980 Director of Nuclear Reactor Regulation ATTN: Mr. Robert W. Reid, C~ief Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Reid:

On October 17, 1978, the District provided you with specific design details for the construction of cable tray fire stops in the reactor building. Your December 14, 1978 letter to the District approved the design. Due to installation problems, the District modified the design.

  • The modification was to extend the marinite board on the bottom of the tray 3 inches from the center of the fire stop instead of five inches as indi-cated in our October 17, 1978 letter. Attached Figures One &Two indicate the modifications. The modification does not affect the ability of the fire stop to perform its function. No other changes in the design described in our October 17, 1978 letter have been made.

The NRC resident inspector will not accept the present design of the fire stop until your approval is received. The District is committed to have all fire stops installed and approved by the end of the refueling outage. To prevent any delay in plant start-up, please review and approve the modified design by March 13, 1980.

If you have any questions or comments, please have your staff contact Robert Daniels immediately at (916) 452-3211, Ext. 613.

Sincerely, ClLj~

dhn J~ Mattimoe Assistant General Manager and Chief Engineer Attachments ffoo3/3D f:J{,7 t7JOQ%JJI ~Jr,~" I){o7 AN E L E CT R I C S YS T E M S E RV I N G M 0 RE T HAN 6 0 0, 0 0 0 IN TH E - ~~E A R T 0F CA l I F 0 R N I A

.. "I \ .

r{:r~ ~~t! **. *~ ~,. ~/41 MAR It-11 TE ~OAR D FA5THJ BOARD TO i="LOOR OR WAia.WiTH NELSON STUDS ( 1/4"- 20" 11/z" ) WITH ll.IUT..-VASHE"R OR HILTI STUD. KWll<- e,6LI OR ).JAIL AS FIE:LD

(TYP.) COIJDITIOIJS DIC.TATE;:..

F'LDOR OR WALL OPHlll-JG ~/4' MARllJITE E>OARD (TOP SOT.~ SIDES) TYP.

  • i~,*y,~-",

gf~G.:* ~< ~.<;> 0 0 r*;:-<

." '.: ~*.~i:.~*.~:~.: ,.;* :.~ :. i.:~_ :*.~,:*~.* ~.*.*-.*.-.

..* .. ..:.. ..* .. .**

.~, ._);~;: : = * :::i:::=,-------1--------:-----,=~=o:=; ~;;~:'"

CA@1L£ TRAY f **.

3 "x 3 A IJ GLE -f--:..+--.lq '-"~th.~~:zz:<!ZZ:z:z:z:z:z:::z:;1:Z:2::zz:z:z:~~~-H---1..

11 TRAY .,

2'RAC.KET WITH 2-9/32"4> HDLES o I I

0 \-IEl~HT ~s; 11

.

EACH LEGi. L_ ---------------- - _.J ATTAC~ WIT~

Y4 IMLTS ~ NUT.5 L 0_ _ _+-____0_ _ _ _ _ _ _ _ 0 _ _ _--t:-----...... o W/F~~D~R WASl-IE~S (2 P~ACES ~ACH ~ID!;) TRA'( WIDTH + I ~/s" +/- Y5" Top V1Ew CA&Lt Tl<A'(

Cl>f4rlO.G~

10/11h'O 1...tETTf:t?.

Y2" WIDE: STAlt.!LJ:~~ STL. ~A~D5 (T'<P. 4 PLAC.E5)

FLOOR OR WALL

",,

',,

' l='J <;>

.JD *

'

.'~ -

FlLL~Vl>lD' WITH SILlCO~E

. FO~ ~ $EMCO PR 8??

CUT DA~ T~ Ctosi;. OPE~ SPACE 11-J 1Rti....f #i. ~EMOV~ A\:TE.R I NSTALLATIOl-.1 QF SILllOl-lE. FOAM (Tf P. l?OTH E.1-lDS)

S1DE VlEW REACTOR BLDG. CABLE TRAY FIRE STOP 10-1z.-1a ATTACHMENT 1

. :***l" t~ ..

..,. __ .

PPORT BOARD FROM E."X-15111.JG

~ISTRUT TRA'{ SUPPORTS e.

WI-IE.RE POSS! BLE

';/4" MARllJITE BOARD

. (TOP, BOT. 4 51DE.5) T't'P. %r MAR HJ IT E BOARD (TYP.)

-~:,{~~--~- .*

!I j_~__:

f:d_ *===r*t---~-----\9....___ _ _-t--s:=i=== TRAY ~EtG~t +:~'

-o" 1

Y:;~ GAP _I CA1GL£ TRAY MAY.I MUM 3"x. 3" AIJGLE.

e>RACk'.ET w/

Z- 9/3z"4' f.IOLES EACl-4 LEC..

ATTACl-l WIT\-!

l/4 BOLTS ~ N LITS 11 W/ \:~J.JD£R WAS~!:l<S

( 1. PLAC~ S EArn S lDf:")

  • OR TO WALL IF Ll:SS

~O~ OR TO BOTTOM D!= TRAY ABOV£ END VIEW 12." IF TRAY 15 VERTICAL

  • ~:;(- OR TO TOP OF TRAY BELOW FILL VOID WITH S\LIC0"1E FOA.M - 5EMCO PR B5~

CUT DAM TO CLOSE. OPE"1 SPACE I~ TRAY ~ REMOVE AFTE!<

l\....lSTALLATlOkl OF 5\LICO\.IE FOAM.

(TYP. e:,ofH ~1-.!DS)

  • -------'Lz.:_WHi&"-S1Alf.J-bE55-5".fEE*b

'C>Af.JDS (i'<P. 4 PLACES)

CUT TD FIT AROLIWD ~~lSTllJG U\..JISTRUT SUPPORTS AS R~QUIRED, C,, t~ A l>I ~ 1$ Ci> S It'll f..G 1o  ; , .., / 7 e 1_. r: ,, ti 12. , ,, . _. _

?:**.

R[ACTOR BLDG. CABLE TRA'( ~\RE 'STOP ATTACHMENT 2 10-12-78

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