ML20066C537

Rev 0 to Through Wall Leak Evaluation for Line 2-SW-234-6-157

ML20066C537
Person / Time
Site:	Brunswick
Issue date:	12/15/1990
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20066C535	List: ML20066C533 ML20066C537
References
1534A-278, 1534A-278-R, 1534A-278-R00, NUDOCS 9101100250
Download: ML20066C537 (18)

Text

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ATTACHMENT 5 RELIEF REQUEST NO.

9 47 Rev. No.

R CAROLIMA POWER & LIGHT COMPANY p

4, Q,,p. 77 METALLURGY UNIT MEMORANDUM T.,

i To:

Harry Mayes Date:

DEC2 1987 i,

Irvestigators:

Ahmad Moccari MSL Ho.:

10-108 h D. b = > T.:

Reviewed by:

Approved by:

d[ w._

Distribution:

Dennis Sullivan TITE / Metallurgy Unit lietallurgy wit Supervisar

Subject:

BSEP Unit 1--Life Prediction of Service Water Pipe Objective The objective of this project was to determine the cause of ' pipe joint '

leaks in concrete-lined service water piping.

Also, evaluate the corrosion rate of the pipe that is in service.

' I Backcround S e -*

fater pipe at BSEP Unit 1-was leaking at severak locations at th joints e

Plant personnel decided to replace several hundred. feet of' the pi s/30 copper-nickel alloy.

.The piping is-16-inch cement-lined-Carboa 106-Grade B with-a wall thickness of 3/4 inch.

Af ter this x

first r

nt, they observed more leakage in old sections of the pipe.

An estimate revealed that'further replacement of the old pipe with.70/30 copper-1 nickel alloy will be very costiy, in view of this situation, Metallurgy Unit' assistance was requested to identify the problem, estimate the remaining life, and find alternative solutions.

.m__._.__J

1 u.r,..Jn. eboo67.,

-- - N, ge,.

METALLURGY UNIT MEhunnnuun ov m i...

2 p e,gd e. K e F l'7 g

i

-Date:

- 3rr

'MSL Ho.'Y

_ 10~-108 gg Laboratory Examinations 3

Several sections of cement-lined pipe were sent to the Metallurgy Unit

-laboratories for' detail examinations.

The sections were photographed, radio-graphed, dimensioned, and ' then some samples were metallographically prepard for optical examination.

Some chips were machined for carbon analysis of the base pipe material and the backing ring metal. Also, corrosion rate of carbon s' teel exposed to the service water was measured electrochemically and gravi-metrically.

Results The as-received appearance, wall thickness measurements, and radiography revealed poor -joint preparation is the primary cause of the _ leakage.

These conditions can be described as follows:

l.

Presence of a crevice between the base pipe and backing-ring. Figure?

1.

2.

Using porous cement for -lining (coating) the joints after they were

welded, j

3.

Damage in'the original cement lining 1 adjacent to th'e joint due to the heat release during and after welding.

4.

Improper application of the cement at the ' joints creating rough sur-faces causing.more severe turbulent _ flow at the joints:resulting in a-liner leakage problem in this area.

Leakage was found at the elbow apparently due toLsolic object-impinge-As long as the sharp angle eibow and high flow rate exists, ment.

this problem will be difficult to eliminate.

i

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c y

7 i

H E K S o. Md erw. p.le.. 4 METALLURGY UNIT MEMORANDUM (continued)

Page:

3 cp 4, g, of l'1 Date:

DEC2 1997 Mst no.:

10-108-Meta 11ographical examination and carbon analysis of the baise pipe _and -

backing ring materials. showed a microstructure typical of carbon : steel and-a

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carbon level in the range specified for Carbon Steel A 106 Grade B:..

A corrosion rate of 15-20 mpy was measured electrochemmically and confirmed by immersion test.

This rate was measured under stagrannt conditions which simulates a crevice tondition ur. der the cement lining.

If f the cement lining is damaged and water at the flow rate of-10 feet per seccond (10 feet per second was given by plant. personnel) interact with the pipe meaterial. the corrosion rate would be estimated to increase by a factor of 2 (cccrrosion rate-would be 30/40 mpy).

These observations-imply that. the remainingg life of the pipe depends very much on the present wall thickness and the irteegrity of the cement coating.

Conclusions 1.

Leakage at the joint' is due - to the improper conditioc ocf the ' cement

• lining.

2.

Leakage at the elbow is due to solid object impingement.

3.

Under stagnant conditions, a cot rosion rate of 15/20 acy -was measured-which should model the corrosion i ste under the joint ccnccrete lining.

Local thickness should of course be accounted for deen estimating remaining' life.

Recommendations 1.

Remove cement lining at the joint, clean the rust,- a.-d crover it with nonporous cement possibly coated with._ sealant.

Use acn application

• technique. that leaves a smooth surf ace 'not raised ab:ve= the orig'inal

~

surface of the pipe lining.

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v

Et p., te.ec67_

I'ev. $ * - N METALLURGY UNIT M[MORANDUM (continued)

Page:

A go, n e,p p Date:

nrr'9

.,f g,_ _

H;SL No.: 108,

4 2.

Replace the pipe with carbon steel cladded with 70/30 copper. nickel alloy.

3.

Replace the pipe with 70/30 copper. nickel alloy.

BAC)*,1HG RING BASE PIPE

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Fig. 1-Photograph shoving the crevice between the base pipe and backing ring.

+

1 I

i e

tre 4. M a*7 METALLURGY UNIT MEMORANDUM (continued)

Rey, t4. _ M Page:

4 4, n e,p q Date:

nrr. 9 g

MSL Ho.:

10-108 2.

Replace the pipe with carbon steel cladded with 70/30 copper. nickel alloy.

3.

Replace the pipe with 70/30 copper-nickel alloy.

I s

BACK1HG RING BASE PIPE

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