ML20137H117

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Rev 1 to Procedure QI-QP-11.0-7, Structural Steel Erection & Bolted Connection Insp
ML20137H117
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 08/16/1978
From: James Smith
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML17198A292 List: ... further results
References
FOIA-85-59 QI-QP-11.0-7, NUDOCS 8512020323
Download: ML20137H117 (6)
v • d • e


Text

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I TEXAS UTILITIES GENERATING CO.

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REVISION PAGE QI-QP-11.0-7 1

8-16-78 1 of 6 STRUCTURAL STEEL ERECTION PREPARED BY:

hb 8-/4-7A AND BOLTED CONNECTION Date INSPECTION APPROVED B ffh%s Ifatd

1.0 REFERENCES

1-A Specification 2323-SS-16B, " Structural Steel - Category I" 1-B Specification 2323-SS-9, " Concrete" 2.0 GENERAL 2.1 PURPOSE AND SCOPE To outline the methods used by QC Inspectors for verification (3(v]

that structural steel is erected and bolted in accordance with Reference 1-A.

HISTORICAL FILE 3.1 INSPECTION REQUIREMENTS 3.1.1 Base Plates and Bearing Plates Acceptance criteria for the setti,ng of base and bearing plates:

Base and bearing plates set to proper grade, leveled, supported a.

and aligned.

b.

Wedges and shims cut off flush with plates.

c.

Entire undersurface of all plates grouted in accordance with Reference 1-B.

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INS TION TEXAS UTILITIES GENERATING CO.

REVISION PAGE g

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8-16-78 2 of 6

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v 3.1.2 Structural Framing Acceptance criteria for structural framing items:

a.

Framing shall be properly aligned, leveled and plumb prior to any field connections.

b.

Members in completed frames true-to-line and free from bends, twists and open joints.

c.

All joint surfaces including those adjacent to bolt heads, nuts or washers free of scale except tight mill scale.

3.1.3 Bolt Holes i

Acceptance criteria for bolt holes:

a.

Holes cut, drilled or punched at right angles to surface of the metal.

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b.

Holes not enlarged by burning, c.

Holes cleanly cut without torn or* ragged edges.

d.

Outside burrs ground smooth.

3.1.4 Bolts Acceptance criteria for bolts:

a.

Bolts are 7/8" diameter (unless otherwise noted).

b.

Bolts rest squarely against metal or washer unless bevel washer is utilized.

c.

Bolts are A-325 or A-490 (unless otherwise noted on Engineer-ing drawings),

d.

Bolts flush with or project past face of nut when completely installed.

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REVISION PAGE N

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CPSES 8-16-78

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3 of 6 3.2 METHODS OF TIGHTENING BOLTS The QC Inspector shall verify one of the two acceptable methods for tightening bolts.

1 3.2.1 Turn-Of-Nut Method a.

Bolts are brought to a snug tight cendition.

b.

Parts of the joint are brought into good contact with each other.

c.

Final nut rotation is in accordance with Table in Figure 1.

d.

Bolts may be reused only with approval of the Engineer, e.

When required nut rotation has been attained, and of bolt marked with Nissen marker.

f.

Inspect a minimum of 10% of the bolts, but not less than O-two bolts in each connection, selected at rando=.

3.2.2 Calibrated Wrench Method If this method is use, the wrenches will be set according a.

to a table provided by the Civil QC Supervisor.

b.

Wrenches calibrated once each working day for each bolt diameter being installed.

c.

Recalibrate wrenches if significant change is noted in surface condition of bolts, nuts or washers.

d.

" Touch-up" previously tightened bolts which may have been I

loosened by tightening subsequent bolts, e.

Inspect a minimum of 10% of the bolts, but not less than two bolts in each connection, selected at random.

3.3 GALVANIZING The QC Inspector shall verify that galvanizing is not used for structural steel installed in the containment, or encased in I

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concrete without Engineering approval.

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INS N TION ISSUE TEXAS UTILITIES GENERATING CO.

REVISICN PAGE NtF3ER DAT:

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CPSES 8-16-78 QI-QP-11.0-7 I

4 of 6 3.4 DOCUMENTATION The QC Inspector shall verify on the Inspection Report (Figure 2) that requirements of this instruction have been met and submit it to the Civil Inspection Supervisor / Designee.

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CPSES QI-QP-11.0-7 1

8-.16-78 5 of 6 FIGURE 1 NUT ROTATIONa FROM SNUG TIGHT CONDITION

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Disposition of Outer Faces of Bolted Parts One face normal to 5:lt length bolt axis and other Both faces sloped

-(as easured fro.?

face sicped not not more than 1:20 underside of head Both faces more than 1:20 from normal to to extreme end of nomal to (bevel washers not bolt axis (bevel point) bolt axis used) washers not used)

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= te e=e 4 ciee-ing 4 diareters 1/3 turn 1/2 turn 2/3 turn Ler 4 diameters but not exceed-ing 8 dianeters 1/2 turn 2/3 turn 5/6 turn Over 8 diameters

'out not exceed 3 ing 12 diameters 2/3 turn 5/6 turn 1 turn

    • Jt rotation is relative to bolt, regardless of the element (nut or bolt) being turned. For bolts igstalled by 1/2 turn and less, the tolerance should be plus or minus 30 ; for bolts irgstalled by 2/3 turn and more.
he tolerance should be plus or minus 45 b;;o research work has been performed by the Council to establish the turn-of-nut procedure when bolt lengths exceed 12 diameters. Therefore,

- e required rotation cust be detemined by actual tests in a suitable snsion device simulating the actual conditions.

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INSTRUCTION ISSUE TEXAS UTILITIES GENERAIING CO.

REVISICN PAGE NU^?cR DA e c

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