ML17173B006
| ML17173B006 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/27/1979 |
| From: | Janecek R COMMONWEALTH EDISON CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-06-01, TASK-6-1, TASK-RR NUDOCS 7908020419 | |
| Download: ML17173B006 (4) | |
Text
- ' *e Common.Ith Edison One First National Plaza, Chicago, Illinois Address Reply to: Post Office Box 767 Chicago, Illinois 60690 July 27, 1979 Mr. D. L. Ziemann, Chief.
Operating Reactors -
Branch 2 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Dresden Station Units 1 & 2 Systematic Evaluation Program Topic VI-1 NRC Docket Nos. 50-10/237
Dear Mr. Ziemann:
In response to your June 6, 1979 letter, the attached tables answer Questions 1, 2, 3 and 4.
The following addresses Questions 5 through 7:
Question 5 Dresden 1 -
We estimate that total area of the painted piping and hangers is on the order of 5%
(2200 ft2) of the wall surface area calculated for Question 1.
Dresden 2 - There is approximately 4,000 ft 2 of pipe Question 6 and hanger surface area which is coated with a red chromate primer.
This primer was not applied per any QA requirements.
Dresden 1 -
We estimate the following amounts of organic materials due to electrical insula-tion inside containment:
Cross-linked Polyethyene Polyvinyl Chloride Silicon Rubber 6.06 ft 3 120.00 ft 3 0.78 ft 3
'19 os 02 0 'Iii
Commonwealth Edison NRC Docket Nos. 50-10/237 Mr. D. L. Ziemann:
2 -
July 27, 1979 Dresden.2 - We estimate the following amounts or organic materials due to electrical insulation inside containment:
Question 7 cross-linked Polyethyene Polyvinyl Chloride 28.19 ft3 28.26 ft3 Dresden 1 -
We estimate there is approximately 1,325 pounds of zinc on the cable trays, wireways, cable pan supports and conduit in.the Dresden 1 contain-ment.
The HVAC system is made of aluminum.
We estimate the HVAC ductwork has approximately 37,000 square feet of surface area.
Dresden 2 - We estimate the following amounts of zinc and galvanized steel inside containment.
Item Classification Cable trays, wireways Cable pan supports & conduit HVAC Total Pounds of Zinc 337 1875 2212 Other. information we believe you.should review is Dresden Station Special Report No. 39i "Analysis of *Hydrogen Generation and Control in Primary Containment Following Postulated Loss of Coolant Accident,*submitted on March 18, 1975 via Mr. R. L. Bolger's letter to Edson* G. Case.* Page 35 of this report addresses other sources of hydrogen and the minimal effect of zinc and paint coatings in the containments.
attachment Very truly yours,
/dk~. ~v~~e-e L.
Robert F.~anecek Nuclear Licensing Administrator Boiling Water Reactors
Area Where.Major Protective Estimated Area Coating System ls Used ln Square Feet SURFACE AREAS REACTOR ENCLOSURE Concrete Areas (Clear Seal) 27,740 Concrete Areas (Painted) 42,550 Structural Steel JJ,780 Gallery Steel including Grating and llandrall s 15,560 Containment Liner Above El. 523 1-6" 86,200 Containment Liner Insulated 517'-6" to 523 1-6 11 3,600 Note 11 Coating work supervision was specified to be provided by representative of coating material manufacturer.
Note 21 Coating tightly adhering to the substrate, no delamination or cracking, Note 31 Finish is worn off to the prlme*r in foot traffic areas, otherwise, coating ls tightly adhering to the substrate, COHNONIJEALTll EDISON COMPANY DRESDEN STATION - UNIT 1 MAJOR PROTECTIVE COATING SYSTEMS IN CONTAINHENT Average Film
' Total De*cription of Thlckne~s E*timate Hatedal *used in Hlls in Pounds Sodium Silicate Sealer 3,0 555 Surfacers Modified Vinyl 2,0 766 Phenolic Finlsl11 2 coats Vinyl 4.0 1,575 Copolymer Primers Red Lead Alkyd 2.0 574 Finlsh1 Catalyzed Epoxy 5,0 1,250 Primera Red Lead Alkyd 2.0 265 Finlsh1 2 coats Catalyzed 5,0 560 Epoxy Primera Red Lead Alkyd 2.0 1,465 Finlsh1 Catalyzed Epoxy
. 5.0 J,190 Primer1 Red Lead Alkyd 2.0 61 Fln1sh1 Catalyzed Epoxy 5,0 133 Insulatlon1 2" Polystyrene 468 Note 41 Due to construction in the area, approximately *100 sq. ft, of insulation ls damaged.
Otherwise, coating and lnsulatlon adhering to substrate.
- Note 5; Coating ls reviewed for performance during each refueling outage.
July 12, 1979 Does Coating System Heet QA Provisions Regulatory Used In Present Condition Gulde 1,54 App Uca Uon of Coating System No See Note 1 See Note 2 No See Note 1 See Note 2 No See Note 1 See Note 2 No See Note 1 See Note 3 No See Note 1 See Note 2 No
,See Note 1
.See Note 4 Remarks See No.te 5 See Note 5 See Note 5 See Note 5 See Note 5 See Note 5
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Area Where Hajor Protective Estimated Area Coating System ls Used in Square Fee_t SUPPRESSION POOL Immersion Phase of Shell 21.675 V*por Phase of Shell 21,675 Headers and Supports, Downcomers, 78,200 Baffles, Vent Lines, Spherical Junctions and Galleries DRYWELL Concrete Surfaces a Interior and Exterior of Pedestal, Orywell 5,700 floor inside and outside of Pedestal Orywell Shell, Bio*ahield wall, Vessel supporta 26*,100 Structural Steel Framing, Lateral llraclng ll,960 Grating areas 12,990 Note 11 Coating work inspection was provided under requirements of Sargent & Lundy Standard Specification f~r Field Painting Fonn 1791, The ifull quali*
fled inspector was furni~hed by the coating manufacturer, l
Note 21 120 sq, up with primer.
scraped ft, of rusted ar~a was touched self-curing inorganic zinc All loose coati~g material was and removed as of 1*15-79, COMNONW~AL'l'll EDISON CmlPMIY Date:
July 12 1 1979 DRESDEN STATiON
- UNIT 2 MAJOR PROTECTIVE COATING SYSTEMS IN CONTAINMENT Does Coating Average Film Total System Meet QA Provisions Descr.iption of Thickness E*stimate Regulatory Used In Present. Condition Material Used in Mlls in Pounds Guide 1,54 Application of Coating System Remarks Self curing inorganic Zinc 5,5 1, 734 Yes ANSI NlOl,4 See Note 5 See Note 3 Primer Primera Modified Phenolic 5,0 1,160 No See Note 1 See Notes 6 and 2 See Note 3 Finish a Modified Phenolic 5,0 1,160 Primera Modi lied Phenolic 5,0 4,174 No See.Note l See Note 7
- See Note 3.
Finlsh1 Modified Phenolic 5,0 4,174 Surfacer a Modified Epoxy-12.,s 621
- No*
Poly amide See Note 1 See Notes 4 and 1 See* Note 3 Fin1s1i: Modified Phenolic 5,0 285 Primera Zinc Chromate 2,0 555.
Intermedlatea Modified Vinyl 2,0 500 No See Note 1 See Notes 4 and 1 See Note l Finlsh1 Vinyl co.polymer 2.0 368 Primera Zinc Chromate 2.0 293 Intermediate: Alkyd Enamel 1,5 112 No See Note 1 See Notes 4 and 1 See Note 3 Flnlsh1 Alkyd.Enamel 1.5 112 Primera Zinc Chromate 2,0 273 No See Note 1 See Notes 4 and 1 See Note 3 Finish a Alkyd Enamel 1,5 104 Note l: Coating ls reviewed and analysed for performance dur.
1 ing each refueling outage.
Note 61 Pin-point rust similar ta ASTM Note. 7:
Coating tighly adhering ta t~e substrate.
~o blisfers or delamin,-
Note 41 Nate 51 All loose material ~~ re~aved, and areas are touchr~ up if requi~ed, 45,5 sq, ft, of degraded coating is.
present as of 3-15-p9,.otherwise :
coating ls tightly adhering to thr substrate, J
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.Standard te~t Method.0610 Ru~t Grade 1 is ~resent, This pin*
point rust c~vers approximatJly 107. of the c1oa ted area.
MedJJum No, 8 blls te:rs similar to Stiin-dard test He'thod 0714, caver 1 approximatel~ l'X, of the coat~d area,.Otherwise coating is ~ightly adhering to is\\
1 ubstrate, i
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tion~ present.
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