ML070600200

OCIS-328227-003, Rev 0, Installation Specification for Oyster Creek Nuclear Generating Station - Repair of Concrete Floor Removed in Drywell for UT Readings

ML070600200
Person / Time
Site:	Oyster Creek
Issue date:	12/11/1986
From:	Heisey K GPU Nuclear Corp
To:	Office of Nuclear Reactor Regulation, NRC/OGC, NRC Region 1
References
OCIS-328227-003, Rev 0
Download: ML070600200 (5)

Text

11/01/06 11:2@:16

- I Nuclear NOT IMPORTANT TO SAFETY SPECIFICATION CCIS-323227-003 INSTALLATION SPECIFICATION FOR OYSTER CREEK YUCLEAR GENERATIKG STATIOF:

FIEPAIR OF CCNCRETE FLOOR REMOVEC rr: GRYNELL FOR UT READINGS

\\

DATE 12/11 /56 ENGINEERING APPROVA DATE *.

QA CONCURRENCE DATE

11/01/06 li:20:16 OCIS-328227-003 Page 1 of 4 Rev. 0 TABLE OF CONT,NTS Page 1.o PURPOSE 2.0 QUALITY ASSURANCE REQUIREMENTS

3.0 REFERENCES

4.0 INSTAL LAT I OR

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1.o 2.0 3.0 4.0 OCI$-328227-003 Page 2 o f 4 Rev. 0 PURPOSE 1.1 This specification provides instructions for the repair of the Drywell concrete floor excavated t o permit UT of the Drywell wall.

The subject excavations are located i n Bays 5 and 17.

QUALITY ASSURANCE REQUIREMENTS 2.1 A l l work outlined i n this specification is Not Important to Safety.

REFERENCES 3.1 Work request 328227-002.

3.2 Dow Corning Form 61-320-B-77:

Information About Silicone RTV Foam.

3.3 Dow Corning Form 67-434-78: Spec - Data Sheet for Dow Corning 3-6548 Silicone RTV Foam.

3.4 PROMATEC, Inc. ?roduct Information Sheet f o r LDSE (Light Density S i 1 icone Elastomer).

3.5 GPUN Installation Specification IS-328227-002: Replacement o f Drywell Vessel Core Sample Pluqs.

3.6 GPUN Drawing 3B-153-34-1000, Rev. 0; Reactor Building Elev.

10-3, Repair of Concrete Floor Remoyal i n Drywell for UT Readings.

INSTALL AT I ON 4.1 Prerequisites 4.1.I A1 1 work permits are obtained.

4.1.2 4.1.3 4.1.4 Surface o f concrete and Drywell wall are free of loose dust and grease.

Drywell wall i n the area o f excavation has been painted p e r the requirements of IS-328227-002.

Craft has been adequately trained on the method o f installation o f the materials t o be used.

4.1.5 Shelf l i f e o f the materials has not expired.

4.1.6 Appropriate radiological controls are i n place.

4.1.7 All standing water shall be removed from the trench.

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i OCIS-328227-003 Page 3 o f 4 Rev. 0 4.2 Description o f Repair 4.2.1 This repair shall consist o f placing a protective/sealing layer o f Low Density Silicone Elastomer (LDSE) manufactured by PROMATEC, Inc. over a f i l l layer o f Dow Corning 3-6548 Silicone RTV Foam.

4.2.2 Requirements f o r the F i l l Layer:

a.

I.

C.

d.

e.

f.

9.

h.

The RTV Foam shall be i n s t a l l e d i n the excavation t o a l e v e l approximately 7 1/2 inch below the existing finished concrete f l o o r elevation.

It i s suggested that M&C produce a wedge o f the RTV material outside the Drywell.

This wedge should be approximately 16"M X 40"L. Maximum depth should be about 18" a t one end taper down t o approximately 1/2" on the other end.

M i x and place the foam f o r t h i s wedge per the manufacturer's instructions on four placements o f approximately equal heights.

20 minutes between placements.

Allow a minimum o f Allow finished wedge t o cure f o r a minumum o f 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> before removing from i t s form and transferring t o the Drywell.

Place the wedge i n the excavated area.

T r i m the underside o f the wedge as required so the top i s approximately 2 1/2" below the level o f the finished concrete floor.

T r i m the edges t o provide a t least a 1" clearance t o the edge of the excavation.

Remove the wedge.

Remove a l l standing water from the trench p r i o r t o installation of f i l l layer.

Surface o f trench may be damp.

Place a t h i n layer o f RTV foam on the bottom o f the excavation.

Immediately replace the f i t t e d wedge.

F i l l any gaps between the sides o f the excavation and the wedge with additional RTV foam.

Place additional foam on top of the wedge ( i f required) t o ensure the level o f the cured RTV foam w i l l be approximately 1 1/2" below the finished level o f the concrete floor.

1 -.

• I 11/01/06 11:20:16 OCIS-328227-003 Page 4 o f 4 Rev. 0

h.

Wait a minimum o f 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> f o r the RTV foam t o cure.

which is approximately 1 1/2" below the elevation of the finished concrete floor.

Remove any excess foam to provide a surface 4.2.3 Requirements for Protective/Seal ing Layer:

a.

Mix and place LDSE manufactured by PROMATEC, Inc.

over the RTV foam.

b.

Mixing can be performed by hand or by the method suggested i n the manufacturers information sheet.

In either case, the mixing proportions shall be per the manufacturer's instructions.

c.

Mix full k i t o f material t o ensure monolithic

d.

placement and proper proportioning o f the LDSE.

Placement shall be per the manufacturer's instructions.

wall which will be i n contact w i t h the LDSE shall be dry a t time o f installation.

Sides of the trench and Drywell

e.

When cured, the surface of the LDSE shall be even w i t h or slightly above the level o f the finished concrete floor.

4.2 Documentation 4.3.1 4.3.2 No QC inspections are required.

The Job Supervisor shall ensure the following:

a.

Shelf 'life has not expired.

b.

Surface of excavation and Drywell wall i s free of

c.

Drywell wall i n area of trench has been painted

d.

loose dust and grease.

per the requirements o f IS-328227-002.

Trench is free of standing water.

e.

Mixing and placement of the RTV foam and LDSE layers conform to the requirements of this specification.

The Job Supervisors assurance for each excavated area shall be documented and attached to the Job Package.

The Job Supervisor shall sign/initial and date this assurance.

4.3.3 17OlC