ML20203E782

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Rev 2 to Gr 27 X, General Repair Procedure for Matls & Welds
ML20203E782
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 06/30/1980
From:
CBI NUCLEAR CO.
To:
Shared Package
ML20203E435 List:
References
GR-27-X, NUDOCS 9802270131
Download: ML20203E782 (5)
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Text

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toENTIFICATioN GR 27 X Rev. No. 2 CONTRACT 83670 I

Titt.E GENERAL REPAIR PROCEDURE FOR MATERIALS ,Aac No. ' _ or 5 AND WELDS ,

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1.0 SCOPE

1.1 This procedure covers repair by replacement of material or weids in plates 3/4" and under that have full thickness damage, or f rom any need requiring replacement.

2.0 REFERENCES

2.1 1977 ASME Boiler and Pressure Vessel Code,Section III, Subsection NE and Sec-ion IT., S'77 Addenda.

3.0 PROCEDURE

3.1 Repairs by welding from both sides (Limited to 2 sq. in.

and at least 2" or 8 t in any direction from a butt weld).

3 1.1 Weld in accordance with the contract weld procedure (Wide Gap Section of GWPS).

3.1.2 The repair area shall be 100% RT in addition to all NDE required on adjacent butt welds.

3.1.3 If the repair reauires leak chase, use the same material and welding details that are shown or the CBI contract drawings. Tie re. pair leak chase into the nearest existing test zone, and examine and test as required on that zone.

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CONTRACT 83670 -

TITLE GENERAL REPAIR PROCEDURE FOR M'PERIALS AND WELDS PAGE No- 2 OF $

Paoouct CONTAINMENT LINER 3.2 Repairs by welding from one side (where only one sida accessible g and limited to an area 1" x3").

3.2.1 Remove the defective area with an arc gouge sSee

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3.2.2 Raice area enough to insert a 2" x 4" x 3/16" or 1/4' back-up plate. (See sketch).

(Note: Back-up plate shall have all outer edges ground ~

to a 2 to 1 slope) .

3.2.3 Weld in accordance with the appropriate contract weld procedure.

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? 2.4 The repair shall be vacuum box tested and liquid penetrant examined.

3.2.5 If the repair requires leak chase, use the same material and welding details that are shown on the CBI contract drawings. Tie repair leak chat 2 into the nearest existing test zone, and examine and test as required on that zone.

3.3 Repairs by replacement from one side (where only one side accessible and the area is larger than 1" x 3").

3.3.1 Remove the defective crea with an arc gouge (See

, sketch) Note: All edges of cutout must be at least

- 12" f rom anotner butt weld.

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CC.168 A aEV J AN 7 7

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IDE NTWIC ATION GR 27 X g REV. NO. 2 cONTnAct 83670 Tiri.e GENERAL REPAIR PROCEDURE FOR liATERIALS AND WELDS PAGE NO. 3 Or 5 nnOOvcT CONTAINMENT LINER 3.3.2 Raise area enough to insert a 3/16" or 1/4" thick back-up plate and rotate into position. (See sketch) .

(Note: Back-up plate shall have all outer edges ground to a 2 to 1 slope).

3.3.3 Prepare and install insert plate with a 1/4" gap.

3.3.4 Weld in accordance with the appropriate contract weld procedure .

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. 'A 3.3.5 The repair shall be vacuum box tested and liquid penetrant examined.

3.3.6 If the repair requires leak chase, use the same ,

material and welding defails that are shown on the CBI contract drawings. Tie repair leak chase into the nearest existing test zone, and examine and test as required on that zone.

3.4 Repairs by replacement (access from both sides when area exceeds 2 sq. in. or is closer than 2" or 8 t from a butt weld).

3.4.1 Flame cut out the damaged area (minimum 12" x 12" or 12" diameter).

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ioenverec4 TION GR 27 X REV.NO. 2 coninAct 83670 Tirte GENERAL REPAIR PROCEDURE FOR MATERIALS AND WELDS PAGE NO. 4 OF 5 PRODUCT CONTAINMENT LINER Q.y n-12 '

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MPI LA t. IN PLATS 3.4.2 Prepare and install insert plate with 0 - 1/16" gap.

3.4.3 Weld in accordance with the appropriate contract welding procedure.

3.4.4 The insert joint.s shall be examined per NDE require-ments of the nearest adjacent butt welds.

3.4.5 If the repair requires leak chase, use the came material ar.d welding details that are shown on the CBI contract drawings. Tie repair leak chase into the nearest existing test zone, and examine and test as required on that aone.

4.O MATERIAL: (Permanent) 4.1 The materi al used as insert plates shall meet the same MS and QAS as the vessel material. These plates shall have the proper identificatien for traceability either to the CTR's or to the mother plate.

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IOEN TIFIC ATION GR'27 X REV.NO. 2 CONTS OT 83670 TITLE GENERAL REPAIR PROCEDURE FOR MATERIALS PAac NO. 5 or 5 AND WELDS PROQUCT CONTAINMENT LINER

5.0 DOCUMENTATION

5.1 Nonconformity to be listed on "Nonconformance Control List".

Repair to be controlled by " Repair Check List". All docu-mentation to be in accordance with Q. A. Manual.

5.2 Jobsite QA shall notify Engineering in writing of any changes to the Check Lists or Record Drawings (such as adding a seam or material) which the sobsite may have to initiate as a result of repairs made per this repair procedure.

A copy of the notification shall be filed with the contract records.

6 GO 168 A REV J AN 7 7

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