ML20140F109
| ML20140F109 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/01/1983 |
| From: | Williams H TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML20140F059 | List: |
| References | |
| FOIA-84-487 QI-QP-11.4-23, NUDOCS 8507080134 | |
| Download: ML20140F109 (5) | |
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, OEXAS UT1UTIES GENERATING CO. i NUMSER CATE i
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CPSES 6
1 of.a igI-QP-11.4 : MAR 01 1933!
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sJt2// YW 2/r//AT PRE?ARED BY:
I REINSPECTION OF SEAL f
i C0ATED AND FINISH
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.:2IvdJ COATED STEEL SUBSTRATES AppR0yE3 sy:
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IS MISSING OR DISCREPANT I
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1.0 REFERENCES
i 1-A Nonconfonnance Report Numbers C-81-01370 through C-81-01373 and C-81-01567 7
1-B CP-QP-18.0, " Inspection Reports" i
1-C CCP-30, " Coating Steel Substrates Inside Reactor Buildings I
and Radiation Areas" l
1-0 CCP-30A, " Coating Steel Substrates,Inside Reactor Buildings i
and Radiation Areas" 1-E QI-QP-11.4-1,
" Inspection of Steel Substrate Surface i
Preparation and Primer Application" l
1-F QI-QP-11.4-5, " Inspection of Steel Substrate Primer Repair and Seal and Finish Coat Application and Repair" l
- ~L HISTORICAL FILE
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i This instruction shall describe methods ' utilized by Quality Control in the measurement of the dry film thickness (DFT) and adhesion to steel substrates of existing seal or finish coat applications described in Reference 1-A using the I
Mark II Tooke Gage and the Elcometer 106 Adhesion Tester respectively.
The above tests are destructive in nature
- i which will necessitate a repair of the coating system at 6
each spot test location, i
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3.0 INSTRUCTION i
For each seal or finish coated steel item or component for which documentation is missing or discrepant, the tests discussed in Paragraphs 3.1 and 3.2 shall be performed at the frequencies indicated therein.
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INSTRUCTION ISSUE
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REVISION AGE NUMBER DATE i'
- TEXAS UTIUTIES GENERATING CO.
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2 of 5 QI-QP-11.4-23 6
MAR 01 IS83
.I 3.1 TOOKE TEST (SCRATCH TEST) i The scratch test shall be perfonned by using a Mark II j
Tooke Inspection Gage using a 2X tip.
l A daily confidence check shall be perfonned to insure accuracy j v;.
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 readir.g obtained using a calibrated Elcometer Inspection DFT Gage or equivalent.
The reading obtained r.
f4 with the -2X tip of the Tooke Gage shall not vary by more i 'r than 2 0.5 mils from that obtained with the Eclameter
,'g Inspection DFT Gage.
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,j Five separate Tooke readings spaced evenly over each seal or p.;
finish coated iten (See Note 1) shall be taken.
Dry film thickness shall be as follows:
Average Any Single Reading of Five Q,/
43 CZ 11 Primer 1.5 - 5.5 2.0 - 5.5 l}
D6 1.5 - 5.5
'2.0 - 5.5 Total Coating System 7.0 - 11.5 7.0 - 11.0 j'
In the event that any reading (s) is found to be outside of the acceptable primer thickness range, additional readings shall be taken to detennine the extent of the unacceptable i
!u area.
Dimensions and locations of unacceptable areas and 2
results of additional testing shall be documented. in the-j}j
" Remarks" section of Attachment 1.
s 1
NOTE 1:
For small areas.of seal or finish coated surfaces, l3 five separate readings shall be taken. For items with less than 5 square feet of exposed coating, a ' minimum of three separate readings shall be i.:
taken.
For larger seal or finish coated areas
! ;,i such as containment - liner plate, five separate
{1 readings randomly spaced shall be taken for each l(
100 square feet of coating.
I NOTE 2:
Seal or finish coated surfaces meeting-the
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following descriptions shall not be subject to ll; testing with the Tooke gage:
a.
Areas or items which are inaccessible due to
,Q,..,6 installation of permanent items or equipment.
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INSTRUCTION ISSUE REVISION PAGE TEXAS UTILITIES GENERATING CO.
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,I-QP-11.4-23 6
MAR 01 !$33 3 of 5 Q
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b.
Items that due to their size or configuration will not accomodate testing with a Tooke gage.
c.
Areas or items which have acceptable Primer Records shall be tested with a Eclameter Inspection DFT Gage or equivalent for total system.
3.2 ADHESION (PATCH) TEST The QC inspector shall perfonn an Adhesion (Patch) Test.on each seal or~ finish coated item (See Note 1). 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. (See Note 2 and 3 below.)
NOTE 1:
For larger seal or finish coated areas such as containment building liner pl ate, the Inspector bs shall perfonn one test for every 500 square feet of coating.
NOTE 2:
For items with total exposed surface area of 10 square feet or less, each adhesion test snall consist of.only one dolly tested to failure.
NOTE 3:
Seal or finish coated surfaces meeting the following descriptions shall not be subject to adhesion testing:
a.
Areas or items which are inaccessible due to installation of permanent items or equipment.
i b.
Items that due to their size or configuration will not accomodate testing with an E1cometer 106 Adhesion Tester.
Acceptance Criteria:
The minimum acceptable strength per dolly shall be 200 psi.
If a dolly should fail the minimum strength criteria, the following additional adhesion testing shall be performed:
1)
On large surface areas sucn as liner plate, four e.Ss additional dollies shall be adhesion tested at j
approximately one foot from the failing dolly and 7
spaced radially at approximately 90 degree intervals.
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MAR 01,tegy 4 of 5 d
2)
On components with smaller surface area such as miscellaneous steel or supports (conduit, cable tray, or pipe),
two additional dollies shall be adhesion 4
tested at one foot or less from the failing dolly with one located on each side of it.
If any
- of the additional dollies should fail the minimum strength criteria, additional dollies shall be placed and tested in accordance with 3.2 or 'as applicable until area of loss of adhesion is isolated.
This area (s) of coating i
'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 unsatisfactory and could be inadvertently recoated with the unsatisfactory condition remaining, a hold tag shall be used. A hold tag 4
shall be placed on~ the -item or area referencing the unsatisfactory Inspection Report number and app 1':able NCR.
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3.4 DOCUMENTATION i
Results of inspections per Paragraphs 3.1 through 3.2 shall be documented on Inspection Report, Attachntent-1, in accordance with Reference 1-8.
The completed IR shall be i
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.
3.5 REPAIRS s.
Repairs of each coating area either scratch-tested or-adhesion tested shall be perfonned in accordance with Reference 1-C or 1-0 and reinspection of repaired coatings j
shall be in accordance with Reference 1-F.
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MAPPING OF LARGE' AREAS For large areas (such as reactor containment liner plate) each IR No. and the inspection area to which the IR 4
corresponds shall be indicated on the map drawing.
The map drawing shall be maintained by the QC Supervisor, l
or his designee, until the entire surface has been inspected as required. Completed map drawings shall be transmitted to
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63 the Pennanent Plant Records Vault.
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CPSES QI-QP-11.4-23 6
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RECCR0r Adhesion Test Stnnsth in osir i l l I
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