ML20140F139
| ML20140F139 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/23/1981 |
| From: | Jacqwan Walker TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML20140F059 | List: |
| References | |
| FOIA-84-487 QI-QP-11.4-23, NUDOCS 8507080162 | |
| Download: ML20140F139 (4) | |
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l lNSTRUCTION l REVISION ! ISSUE l
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I PREPARED.SY:
f REINSPECTION OF
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COATED STEEL SUBSTRATES
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1.0 REFERENCES
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1-A Nanconformance Repert Embers C-81-01370 through C-81-01373 and C-81-01567 g
1-B CP-QP-18.0, " Inspection Reports" 4
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1-C CCP-30, " Coating Steel Substrates Inside Reactor Buildings and Radiation Areas" 1:.
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1-0 CCP-30A, " Coating Steel Substrates Inside Reactor Buildings
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7 and Radiation Areas" d
(E, ij 1-E QI-QP-11.4-1,
" Inspection of Steel Substrate Surface Preparation and Primer Application and Repair" lj l
1-F QI-QP-11.4-5, " Inspection of Steel Substrate Seal and Finish y
Coat Application and Repair"
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2.0 GENERAL
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3 2.1 PURPOSE AND SCOPE I
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This. instruction shall describe methods utilized by Quality I
Control in the measurement of the dry film thickness (DFT)
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and adhesion to steel substrates of existing coating applica-tions described in Reference 1-A using the Mark II Tooke
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Gage and the Elcometer 106 Adhesion Tester respectively.
The above test is destructive in nature which will a
necessitate a repair of the coating system at each spot test location.
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3.0 INSTRUCTION i
For each 100 square ' feet of coated surface for which
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documentation js missing or discrepant the following tests
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QI-QP-11.4-23 1
NOV 2 31981 2 of 4 1
2 3.1 TOOKE TEST (SCRATCH TEST) i A scratch test shall be made using a calibrated Mark II l,
Tooke Inspection Gage, Each test made with the Tooke gage shall be compared to i
readings obtained using a calibrated Elcometer Inspection OFT gage or equiva' lent.
The readings obtained with the 2X tip of the Tooke gage shall not vary by more than 20.3. mils from readings obtained with the - Elcometer Inspection DFT gage.
Five separate reading's shall be taken 3
for each 100 square feet area or less.
Dry film thickness i
shall be as follows:
Average Any Sinole Reading of Five CZ.11 Primer 1.5 - 5.5 2.0 - 4.5
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D6 1.5 - 5.5 2.0 - 5.0 -
Total Coating System 7.0 - 11.5 7.0 - 11.0 1-
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NOTE 1:
Steel.substrates ' identified in Reference 1-A on which only the primer coat has been applied (no seal or topcoat) shall be inspected for DFT per Reference 1-E.
However, these surfaces must still
-i be inspected per Paragraph 3.2.
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3.2 ADHESION (PATCH) TEST l
The QC inspector shall perfonn an Adhesion (Patch) Test on
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- 3 each 100 square foot area or less which is scratch. tested per Paragraph 3.1.
A calibrated Elcometer 106 Adhesion I
!I Tester shall be used to measure the tensile strength of
' 5 adhesion of the coating -system -to the ~ steel substrate.
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Each test shall consist of three individual dollies tested
' f; to failure.
1 Criteria:
The minimum acceptable strength per dolly 7
shall be 200 psi.
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-3.3-DOCUMENTATION 4
Results of inspections per Section 3.1 and 3.2 shall-be documented on Inspection Report, Attachment 1, in accordance with Reference 1-8.
The completed IR shall be forwarded. to the PPRV for retention.
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3 of 4 3.4
, REPAIRS Repairs of each coating area either scratch-tested by the
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Tooke gage or adhesior tested shall be performed in accordance with Reference 1-C or 1-0 and reinspection of repaired coatings shall be in accordance with Reference 1-E or 1-F.
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INSPECTION ATTR15UTES Daft 3 maning e a 3
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I perform Tccke test cer Para. 3.1 to determine thickness
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l RECORD: ttintmum Spot Test Primer:
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Maximum Scot Test Primer:
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I f*axir'um Scot' Test total System:
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Average Soot Test Total System:
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- 2. I Perform Adhesion test per Para. 3.3.
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