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3.5

INSTALLATION OF WINDOW FRAMES

A.

Set unleaded side of frame plumb and square in wall opening on control room side of wall with shims.

B.

Set leaded side of frame plumb and square in wall opening on X-Ray side of wall.

C.

Compress sides together against faces of wall.

D.

Install setting blocks, shims, and glazing tape in glazing channel to prevent galls from touching steel frame.

E.

Install radiation resistant glazing in telescopic frame.

F.

Place steel stops in position and mark location of stop and frame retaining holes on steel frame.

G.

Remove glazing and drill holes in steel frame.

H.

Place glazing and stops and hand drive setting screws.

3.6

INSTALLATION OF PENETRATING ITEMS

A.

At penetrations of lead linings; provide lead shields to maintain continuity of protection.

B.

Provide lead linings, sleeves, shields, and other protection in thickness not less than that required in assembly being penetrated.

C.

Cut wall penetration covers from lead sheet of equal or greater thickness than backing on adjacent wall panels.  Cut wall penetration covers to size required to cover wall penetrations with laps 1 inch (25 mm) minimum wide as indicated on penetration detail drawings.

D.

Adhesive-apply lead sheet penetration covers on penetrating boxes and raceways and return penetration covers to backside of lead-backed wall panels with 1 inch (25 mm) minimum laps.

1.

Do not use penetrating fasteners unless indicated otherwise.

E.

Outlet Boxes and Conduit:  Install between studs using steel telescoping mounting brackets.  Cover or line with lead sheet lapped over adjacent lead lining at least 1 inch (25 mm).  Wrap conduit with lead sheet for 10 inches (250 mm) in from box.

3.7

INSTALLATION OF WALL PENETRATION COVERS

A.

Duct Penetrations With 8 PSF or Less Lead Sheet:

1.

Wrap ducts with wall penetration covers, lapping lead joints 1 inch (25 mm) minimum.

2.

Secure lead sheet in place with 1 inch (25 mm) minimum width steel bands spaced not more than 12 inches (305 mm) on center.

3.

Do not cut into lead sheet with tightening steel bands.

B.

Duct Penetrations with Greater than 8 psf Lead Sheet and Where Duct Shielding Exceeds 24 Inches (610 mm) in Width:

1.

Laminate wall penetration covers to plywood or other similar structural panels conforming to shape of duct, lapping lead joints 1 inch (25 mm) minimum.

2.

Secure lead laminated panels to ducts with mechanical fasteners located at duct seams and corners.

3.

Where necessary to prevent lead laminated panels from overloading duct supports, independently suspend panels from hangers secured to overhead building structure.

4.

Cover fastener heads with lead sheet matching thickness of adjacent lead.

RADIATION PROTECTION13 49 00 - 12

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