ML20140F076

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Rev 11 to Procedure QI-QP-11.4-23, Reinsp of Seal-Coated & Finish-Coated Steel Substrates for Which Documentation Is Missing or Discrepant
ML20140F076
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 08/18/1983
From: Welch M
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20140F059 List:
References
FOIA-84-487 QI-QP-11.4-23, NUDOCS 8507080098
Download: ML20140F076 (6)
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INSTRUC"'1CN ISSUE (EXAS UT:t.! TIES GENERATING.CC. NUMBER lr REVIS!CN i' l DATE PAGE f3

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QI-QP-11.4-23 11 .g j

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REINSPECTION OF SEAL PREPARED SY: /4 k- , -- 6 OA ED EEL B TRATES APPROVED BY: Y -

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1.0 REFERENCES

1-A Nonconfomance Report Numbers C-81-01370 through C-81-01373 i

and C-81-01567 1-B CP-QP-18.0, " Inspection Reports" ,

1-C CCP-30, " Coating Steel Substrates Inside Reactor Buildings I and Radiation Areas" 1-0 CCP-30A, " Coating Steel Substrates Inside Reactor Buildings

{'3 < and Radiation Areas" -

l 1-E QI-QP-11.4-1, " Inspection of Steel Substrate Surface

Preparation and Primer Application" 4

1-F QI-QP-11.4-5, " Inspection of Steel Substrate Primer Repair and Seal and Finish Coat Application and Repair" 1-G CP-QP-15.0, " Tagging System" ,, C*yd .esh 2.0 GENERAL pft.@) .

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t-PURPOSE AND SCOPE This instruction all describe methods utilized by Quality i Control in the measurement of the dry film thickness (DFT) and adhesion to steel substrates of existing seal or finish ccat applications described in Reference 1-A, using the Mark II Tooke Gage and the Elcometer 106 Adhesion Tester respectively. The above tests are destructive in nature which will necessitate a repair of the coating system at each spot test location.

3.0 INSTRUCTION .

l c, For each seal or finish coated steel item excluding i O miscellaneous steel, conduit and cable tray supports, or

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Vf INSTRUCTION REVISION' ISSUE PAGE NUMBER DATE TEXAS UTILITIES GENERATING CO.

CPSES 2 of 6 QI-QP-11.4-23 11 AUG 18 ISS3 component for which documentation is missing or discrepant, the tests discussed in Paragraphs 3.1 and 3.2 shall be perfomed at the frequencies indicated therein.

NOTE: Conduit supports that the unique number is not readily visible will be documented and identified in the following manner on the IR:

1) Beginning of the run in the area to be coated by junction box number, unique elevation, ~

major equipment spin number, etc.

2) The conduit identification number.
3) The number of supports on the run in the area as defined. The Unique number of any supports on which it is readily visible.
4) The termination of the run or the boundary of the area to be coated.

(') Implementation of this note shall be as directed by the QC Supervisor and may be unique for diffierent areas of inspection.

3.1 TOOKE TEST (SCRATCH TEST,)

The scratch test shall be perfomed by using a Mark II Tooke Inspection Gage using a 2X tip.

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A daily confidence check shall be perfomed to insure accuracy of the Tooke Gage. The gage shall be inspected for damage, tip ware and a scratch shall be made with the Tooke Gage and compared to a reading obtained using a calibrated E1cometer Inspection DFT Gage or equivalent. The reading obtained with the 2X tip of the Tooke Gage shall not vary by more tnan 2 0.5 mils from that obtained wi th the Eclometer Inspection DFT Gage.

Five separate Tooke readings spaced evenly over each seal or

-finish coated item (See Note 1) shall be taken. Acceptable primer thickness shall be .0015 in to .007 in. No minimum topcoat thickness shall be specified however, the topcoat shall provide full " hiding" properties of the primer.

Maximum combined thickness of primer and topcoat average

- shall be .013 in. with maximum spot check of .015 in. Dry fi.lm thickness sHall be as follows:

Average

-' Any Single Reading of Five Ps 1:1: h8 1:1 : h8

, TUGCC CA

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', INSTRUCTION ISSUE PAGE REVISION TEXAS UTILITIES GENERATING CO.

CPSES .

QI-QP-11.4-23 11 fuG 18 1983 3 of 6 1.

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In the event that any reading (s) is found to be outside of the acceptable primer thickness range, additional readings ,

shall be taken to determine the extent of the unacceptable J area. Dimensions and locations of unacceptable areas and results of additional testing shall be documented on 4

7; Attachment 1.

I In the event that the average of the area is unacceptable due to unacceptable spot readings, the unacceptable spots

, shall be isolated as described above Additional spot readings shall be taken equal to the number of unacceptable i spot readings and the average recalculated. Results of these

" additional readings shall be documented in the " Remarks" area of the IR. If the recalculated average is acceptable, the IR shall be so marked with an explanation in " Remarks" stating that " average recalculated - now acceptable", or

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! wording to that effect. If the recalculated average is i unacceptable, the. unacceptable spots shall be isolated

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( ,, , (as described above) and the above re-averaging process

" repeated.

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. NOTE 1: For small areas of seal or finish coated surfaces, five separate readings snall be taken. For items with less than 5 square . feet of exposed coating, a minimum of three separate readings shall .be taken. For larger ' seal or finish coated areas i- such as containment liner plate, five separate readings randomly spaced shall be taken for each

100 square feet of coating. .

1 NOTE 2: Seal or finish coated surfaces meeting the-following . descriptions shall not be subject to i -testing with the Tooke gage:

a. Areas or items which are inaccessible due .to -

installation of pennanent items or equipment.

b. Items that due to their size or configuration
i. will not_ accomodate testing with a Tooke gage.
c. Areas f or items which have . acceptable Primer Records shall be tested with a Eclometer -

Inspection ~ DFT Gage or equivalent for total system.

4- s V 3.2- ADHESION (PATCH) TEST- ,

The QC inspector shall perterm one Adhesion (Patch) Test for

. . .every 500 sq. ft. for coating on the containment liner i j i %g, ,

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t INSTRUCTION ISSUE PAGE REVISION TEXAS UTILITIES GENERATING CO.

CPSES l QI-QP-11.4-23 11 M IS 1583 4 of 6 6

plate. A calibrated Elcometer 106 Adhesion Tester shall be used to verify that the minimum acceptable tensile strength of adhesion of the coating system to the steel substrate has been attained. Each test shall consist of three individual dollies tested to failure.

Areas or items which are inaccessible due to installation of permanent items or equipment.

Acceotance Criterit.: -

The minimum acceptable strength per dolly shall be 200 psi.

If a dolly should fail the minimum strength criteria, the

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following addi tional adhesion testing shall be perfomed:

Four additional dollies shall be adhesion . tested at l approximately one foot from the failing dolly ~ and spaced

^ radially at approximately 90 degree intervals.

If any of the additional dollies should fail the minimum

. strength criteria, additional dollies shall be placed and i tested in accordance with 3.2 or as applicable until area of loss of adhesion is isolated. This area (s) ~of coating l ~.: .

shall be removed to the substrate, and new coatings applied in accordance with Reference 1-C or 1-D.

3.3 STATUS INDICATORS During backfit activities when items are u'nsatisfactory and could be inadvertently recoated with the unsatisfactory condition remaining, a reject tag shall be used in accordance with Reference 1-G. A reject tag shall be placed on the item or area referencing the unsatisfactory Inspection Report number and applicable NCR.

3.4 DOCUMENTATION

. Results of inspections per Paragraphs 3.1 through 3.2 shall be documented on Inspection Report, Attachment 1, in accordance with Reference 1-B. The completed IR shall'be forwarded to the PPRV for retention. For inspections of coated containment liner- surfaces, the Inspector may document one IR for each 500 square feet of surface area.

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INSTRUCTION ISSUE PAGE R$ VISION OAM 8 .

3' TEXAS UTILITIES GENERATING CO,

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CPSES 5 of 6

  • QI-QP-11.4-23 11 AUG13 j -

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, j'; 3.5 REPAIRS

, Repairs of each coating area either scratch-tested or l, adhesion tested shall be perfomed in accordance with

Refere'nce 1-C or 1-0 and reinspection of repaired coatings 4

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shall be in accordance with Reference 1-F.

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3.6 MAPPING OF LARG'E AREAS For large areas (such .as reactor containment liner plate) 1 each IR No, and .the inspection area to which the IR corresponds shall be indicated on the map drawing.

The. map drawing shall be maintained by the QC Sup'ervisor, or his designee, until the entire surface has been inspected as required. Completed map drawings shall be transmitted to the Pemanent Plant Records Vault.

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Attachment 1 i

l couANext M.Ax sTI m E! c TRic stat:CN e.e - -r INSPECTICN REPORT [4 .

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1. 6 7erfons Toote test per para. 3.1 to detenetne tatcznessi i I  !

I in siis of criser and total systen (document one set i l i l i

.. i of readings for esca 1GO sc. ft. wnen testing Contatn- ! l l [ j

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RECORD
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. W z. Soot Tot. System: I l - 1 I i i  !

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2. I Perdern AdMesion test see ears. 3.2. t I I l l RECORD: Adhesion Test 5twth in ost: 1 i t I  !

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