ML20024E499

Responds to NRC 830624 & 0706 Ltrs Re Violations Noted in IE Insp Repts 50-373/82-54 & 50-374/82-22.Corrective Actions:Firestop in Each Penetration Will Be Enlarged by Filling in Opening W/Gypsum Cement & Felt

ML20024E499
Person / Time
Site:	LaSalle
Issue date:	08/05/1983
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20024E496	List: ML20024E499
References
7098N, NUDOCS 8308150177
Download: ML20024E499 (6)

Text

i +

~

• [D 7Commonwealth Edison

,(/ ~ ~ ~' Address

) ons Reply Firstto:National Post OfficePlaz Chicipo. Ilhnois Box 767 sj Chicago, lilinois 60690 August 5, 1983 Mr. James G. Keppler, Regional Administrator

- Region III .

U.S. Nuclear Regulatory Commission 799 Roosevelt Road-Glen Ellyn, IL 60137

Subject:

LaSalle County 3tation Units 1 and 2 Firecode CT Gypsum Cement Firestops -

Supplemental Information I.E. Inspection Report Nos.

50-373/82-54 and 50-374/82-22 NRC Docket Nos. 50-373 and 50-374 References (a): D.L. Farrar letter to J.G. Keppler dated June 24, 1983.

(b): D.L. Farrar letter to J.G. Keppler dated July 6, 1983.

Dear Mr. Keppler:

Attached is the information that the NRC requested on the coeffi-cient of expansion for Firecode CT Gypsum cement and cable densities in Unit 1 cable tray penetrations. This completes our response to the subject inspection reports.

Commonwealth Edison Company is prepared to discuss this and other related information with your staff. Please contact-this office if further discussion is desired.

Very truly yours, C. W. Schroeder U Nuclear Licensing Administrator

-1m cc: NRC Resident Inspector - LSCS AUG 081983 7098N

-8308150177 830810 PDR ADOCK 05000373

.G __ _PDR _ _ _ ,

ATTACHMENT Supplemental Response to Inspection Report No 's 50-373/82-54 and 50-374/82-22

1. Cracking and Separation - Thermal Expansion When Firecode CT Gypsum cement is heated, it will expand to fill or decrease voids in the seal. Its thermal coefficient of linear expansion is between 8.35 and 8.60 x 10-6 in/in/0F inclusive.

Gypsum cement also expands about 0.12% during setting. The attached July 21, 1983, letter from U.S. Gypsum provides additional information on this subject.

3. Cable Density - Unit 1 Wall Penetrations As documented in reference (1), the maximum cable fill density tested in a wall penetration with a cable tray is 51%, and two Unit 1 cable tray penetrations in three-hour fire rated walls, AB2135 and AB2142, have cable fill densities greater than the tested limit.

Penetrations AB2135 and AB2142 have cable fill densities of 51.4% and 52.6%, respectively. The attached July 27, 1983, Sargent and Lundy letter lists all of the Unit 1 wall penetrations with cable fill densities greater than 40%.

Both penetrations are located in the wall between the cable spreading room (fire zone 4D1) and the cable area (fire zone SA4) at elevation 749' in the auxiliary building. This wall is approximately 12" thick, and the firestop in both penetrations consist of 5" of Firecode CT Gypsum cement and a layer of Thermafiber CT felt in the cable tray and 2" of cement and 6" of felt in the area around the cable tray.

Since the cable fill densities in these two penetrations are lese than 2% above the test limit, we do not believe that the fire endurance capability of the firestops is degraded. However, to provide additional assurance that the seal meets the requirements for a three-hour fire. rated barrier, we propose to enlarge the firestop in each penetration by filling in the remainder of volume in the opening with gypsum cement and felt. Thus, each penetration will contain the equivalent of two three-hour fire rated seals. This work will be completed within three months after NRC concurrence.

To prevent any other penetrations from exceeding the cable fill density limit, we will revise existing engineering procedures by December 31, 1983, to ensure that this item is reviewed in the design of modifications. The station will review its procedures and-revise them as necessary to ensure that any design changes involving Safe Shutdown _ Analysis - required fire seals be submitted to engineering for review and approval. To assist the station, engineering is in the process of issuing electrical drawings that list all electrical firestops in fire rated walls or floors.

7098N

- w w m.:~p::-mo

,A :1ri,y mI"' > -

/ 't ' p%h, UNITED STATES CYPSUM CHMPANY L

3.!

~ lE "3 ;

37 101 S. Wacker Dnve Chicago, lihnois 60606 312/321-4000 j D gf* /[*[N * ,

,,aw.ww o

July 21, 1983 Mr. E. L. Seckinger Commonwealth Edison - SNED P.O. Box 767 Chicago, IL 60690

SUBJECT:

LaSalle County Station USG Fire Stop Systems NRC Allegation Regarding Thermal Expansion

Dear Mr. Seckinger:

In reply to the NEC requesting additional information that FIRECCDE CT Gypsum Cement expanded during a fire, we offer the following for their consideration.

On page 100, Table VIII, of the Manual of Lathing and Plastering, John R. Diehl AIA Auther, copyright 1960, MAC Publishers Association, refers to typical properties of gypsum as reported by the Gypsum Association in which the Thermal Coefficient of Linear Expansion is one of the prop- ,

erties listed (copy attached) . The Thermal Coefficient of Linear Ex- -

pansion (in/in/0Fx10-6) of gypsum aggregated with vermiculite aggregate ranges from 8.35 to 8.60 x 10-6 FIRECODE CT Gypsum Cement is aggregated with vermiculite and falls within this range.

In addition to thermal expansion, gypsum expands during setting. FIRECODE CT Gypsum Cement has a setting expansion of 0.12% and unlike portlant cement mixes which shrink, always has a net expansion.

If you require further information, please contact me.

Very truly yours, UNITED STATES GYPSUM COMPANY R. L. Bartlett Technical Representative RLB/d1h attachment cc: #151 R. G. Lange Mr. Tom Hoff

1. 173 P. G. Smith TRANSCO, Inc.

1. 440-3 E.' L. Whiteside 55 E, Jackson Blvd.

Chicago, IL. 60604-A GYPSUM CEMENT FOR EVERY INDUSTRIAL NEED

9 .

f) 100 MANUAL OF LATIIING AND PLASTERING e<

t.'}

t t Table Vill.

l 3

N:

4>.

. Properties of Gypsum Job Mixed Basecoat Plasters

. I 3. '. Sand Perlite Vermiculite Wood Fibered to Sand kff, "P'"Y 1

2 1:3 1:2 1:3 1:2 1:3 1 :'O 1:1 tt

o l{ q Compressive Strength

[ Pounds per sq. in. 775-1050 525-700 600-800 450-60(5 400-525 250-325 1750-2350 0,

• 4 Tensile Strength

! . Pounds per sq. in. 150-200 100-150 165-170 150 130-160 70-100 280-400 240-250 4f x 8

, htodulus of Elasticity

.j i si Pounds per sq. in. x 108 1.0 1.15-1.20 0.21-0.33 0.028 0.65-0.75

t. .. y $ D e, f Density In-Place 4le'd y Pounds per cu. ft. 101-120 101-120 50-56 41-45 50-55 42-45 79-82

,'a h ! I ';

l ej l CoefEcient of Linear d .5 1 Espansion y, jf, 1; t

.. .a

],  ;

inches / inch / degree F x 10-* 6.50 6.75 7.35 7.30 8.35 8.60 9.30 p i8 4;) Thermal Conductivity 323i;! BTU /.sq. ft./ hour /*F/.

,s)'.,~

inch thickness 5.51 5.60 1.Gl 1.31 1.74 1.42 3.15 f ,3 Sourcc: Cm.um Awociation.

S1 M y i . ':

,"  ;; i' t a relatively Idgh percentage of cementitious mate- Table IX.

rial) are generally subject to greater initial shrink-

k;klpI. : if age upon drying than are Ican mixes. It is generally Calculated Tensile Strains at Failure for Vcrious (t k recommended that mixes tending toward the lean Gypsum Plasters'

-. 1; f side be used for c.xterior plaster, due to the mate-

$ rials used and the presence of environmental condi- .g.Co puted fi ff [!ll s .-

tions producing movement. Along with this are the Tensile Afodulus of at Failure

, n h i ;;,! more severe consequences of possible cracking re- Plaster Pmponions Strength Lbs./sq. in.

Elasticity hileroinches/

Lbs./sq. in.

{  ! { sulting from movement than would be the case in in./in.

,? - i ,; ! interior applications. Wood-Fibered

. j', Summary tabulations of some of the properties Cypsum Plaster 290 -

753,000 386 O<  ?; of gypsum plasters are in Tables VIII and IX.

}, d;; I : 4 Verm.icu . lite f ,

1 Brown Coat 80 175,000 457 ti s, MIXlNG THE MATERIALS

[ q' .,g Lime causing Finish Coat 70 111,000 631 1 1. .\ fixing mnsists primarily of two operations:

( ! . I,, first, mea;uring the components according to the [:,,2Natt 310 985,000 315 l . * . required proportions and adding them to the mix-I 1 ing box or machine; second, combining the com- 1 : 3 sand

{ ! }{h :, ponents into a homogeneous mixture while adding nmwn Coat 210 730,000 280 1 y ,l

' ti j

.. u..

s

.9 3

I"

,' . . SARGENT & LUNDY ENGINEERS SS E AST MONROE STREET C HIC AGO. ILLIN f)ls 6 06 0 3 (3125 269 2000 TWX 910 2 2 5 2 0 0 7 SCE-1853 July 27, 1983 Project No. 4267-02 Commonwealth Edison Company . , ,

La Salle County Station - Unit 1 . _ . . .

Cable Tray Fill Density for Horizontal Cable Tray Wall Penetration Fire Seals. __

Part of Sargent & Lundy Punchlist Item 3.96 ..

Mr. T. E. Watts Commonwealth Edison Company P. O. Box 767 Chicago, Illinois 60690

Dear Mr. Watts:

After completing our work identifying all electrical openings in Unit 1 that require fire seals, we have prepared a list of the horizontal cable tray wall penetrations that. exceed 40 percent of . -

cable tray volume. This information was reques.ted in your letter' -

of May 12, 1983, to Mr. R. H. Pollock. .

Routing Nearest Cable Required By Electrical Drawing Routing Design, . Fill Safe Shutdown Opening No. Number Point Inder . Density,. ,,

Analysis AB2076 1E-1-3665 ;386B 1. 25, . , 49.1% , Yes AB2081 1E-1-3665 445D 1.18 46.3% ,, Yes AB2101 1E-1-3665 3PB 1. 2 0, . . 47.1% . . Yes AB2135 1E-1-3667 JV # 1.31 . 51.4% Yes A32142 1E-1-3667 $D 1.34 52.6% ,, Yes AB2146 1E-1-36F. "?< 1.15, 45.2% Yes RB2053 1E-1-365.- M 7,8 1.06, ,41.6% .

No RB2054 1E-1-3653 1395% 1. 06. . .41.6% , ,

No AB2207 1E-1-3669 653B. 1.15 . 45.2% ..

Yes (Unit 2)

AB2210 1E-1-3669 652B. 1.15, , 45.2 No (Unit 2)

AB2023 1E-1-3663 286A 1.14, - 44.8% .. Yes L AB2059 1E-1-3664 430A 1.24 48.7% Yes AB2065 1E-1-3664 426A 1.02 40.1% Yes TB2086 1E-1-3680- 2113A 1.18 _46.3% No TB2145 1E-1-3683 2370A 1.39, 54.6% No

@oPV .

I L

~

- - S'ARGENT & LUNDY ,

1. EN GIM E E R S CHICOGO I

I Mr. T. E. Watts July 27, 1983 '

Commonwealth Edison Company , . Page_2 The 3-hour fire walls were found using figure 9.5-1 of La Salle County FSAR Chapter 9. These 3-hour fire walls were compared with figure H.2-1 of Appendix H to verify that the 3. hour walls with electrical openings were required by the safe shutdown analysis. Cable fill density is calculated by.using the following formula and is equivalent to the method specified in.your letter:

(Cablo Fill Density) T 4 x Design Index

% Tray Fill = x 100 If you have any questions concerning this, please give me a call.

Yours very truly, ,

J.S.ESTERMAN J. S. Estorman Electrical Engineer JSE:smg In duplicate Copics:

B. R. Shelton .

R. H. Holyoak -

G. J. Diederich E. L. Seckinger D. L. Shamblin R. H. Pollock I

1 l

@oP l i . l

- . - _ _ . ,_ _ _ .-. . .-