ML19320D341

Responds to IE Bulletin 80-08, Examination of Containment Liner Penetration Welds. Welds in 13 Penetrations Repaired as Result of Nondestructive Examination.Summary of Types & Sizes of Penetrations Encl

ML19320D341
Person / Time
Site:	Catawba
Issue date:	07/07/1980
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-08, IEB-80-8, NUDOCS 8007210261
Download: ML19320D341 (7)

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• 36 WCF Perssets? Tttta=cNE: Aets 7C4 Strate Paoovction 373 4083 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: RII:JPO Catawba Nuclear Station Docket Nos. 50-413 and 50-414

Dear Mr. O'Reilly:

In response to your letter of April 7, 1980 which transmitted IE Bulletin 80-08, we wiah to advise that a review of the flued head design for pene-tration connections and other designs with containment boundary butt welds between the penetration sleeve and process piping has been conducted.

There are penet. rations with flued head which contain butt joints at the Catawba Station.

The penetrations were purchased to the ASME B&PV Code, 1974 Edition,Section III, Subsection NC including the Summer 1974 Addenda. Ragulatory Guide 1.19 does not apply to our piping penetration assemblies.

The butt joints attaching the piping to the flued head were examined by the volumetric and surface non-destructive (NDE) methods during the construction of the penetrations.

The welds attaching the piping to the flued heads are of the butt- joint design, utilizing a single V-grove weld without backing bars (rings). There are four different types / sizes of penetrations at the Catawba Station. (See Appendix I.)

As~a' result of the NDE, repairs were made to welds in 13 of 44 penetrations (see Appendix II).

OFFICI AL 00PY. ,

80 072162 N

s Mr.' James P. O'Reilly, Director July 7, 1980 Page Two Ultrasonic (UT) examinations were performed on welds attaching the guard pipe and the outer sleeve to the flued head on the larger diameter pipes.

A more meaningful examination of these welds is possible with UT due to the thickness of pipe and geometry of the penetration. No backing bars (rings) were used thus the geometric reflection from that penetration geometry do not exist. Radiographic'(RT) examinations would not have pro-vided meaningful examination results during construction of the penetrations, n

ry truly yours, ' l 13 . , to . /cu -

- William O. Parker, Jr.

RWO:scs Attachments cc: . Director Division of Reactor Construction Inspection U. S. Nuclear Regulatory Commission Washington, D. C. 20555 G. F. Maxwell NRC - Catawba T

APPENDIX I: TYPES / SIZES OF CATAWBA PENETRATIONS Type I and II (Same Design, Different Size) g43

( w HD w- C <*2 y HD

\ l Type I Size Type of Material

1. Process Pipe 31 SA 106-Gr. C

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2. Guard Pipe 36 3/4" I.D. SA 106-Gr. C 1 5/8" WL

3. Outer Sleeve 54 1/4" 0.D. SA 516-Gr. 70 3/4" W1.

4. Flued Head -

SA 105 Welds hTE Methods Used No. 1 RT and PT No. 2 RT and PT No. 3 UT and PT

t APPENDIX I: TYPES / SIZES OF CATAWBA PENETRATIONS Type _I and II (Same Design, Different Size)

Type II Size Type of Material

1. Process Pipe 18" NPS SA 106-Gr. B-0.937" WL

2. Guard Pipe 24" NPS SA 106-Gr. B 1.218" WL

3. Outer Sleeve 36 1/2" 0.D. SA 516-Gr. 70 3/4" WL

4. Flued Head -

SA 105 Welds NDE Methods Used No. 1 RT and PT No. 2 RT and PT No. 3 UT and PT t

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TYPE III SERIES 1 /ND 2 (Both are same in design but different in size and type of material) g2 b ,,

k I Type III Series 1 Size Type of Material

1. Process Pipe 4" NPS SA 376-Type 0.531 WL 304

2. Guard Pipe 8" NPS SA 106-Gr. B 0.875" WL r

3. Flued Head -

SA 182-F304 Welds NDE Method Used No. 1 RT and PT No. 2 UT and PT l

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TYPE III SERIES 1 AND 2 (Both are same in design but different in size and type of material)

Type III Series 2 Size Type of Material 1.- Process Pipe 14" NPS SA 376-TP316 1 1/4" WL

2. Guard Pipe- 20" NPS SA 106-Gr.-C 1 3/4" WL

3. Flued Head -

SA 182-F316 Welds NDE Methods Used No. 1 RT and PT No. 2 UT and PT e

l

APPENDIX II: NDE AND REPAIRS OF CATAWBA PENETRATIONS Welds in 13 penetrations were repaired as a result of NDE performed during construction. The defects repaired and NDE method used to detect them are:

RT - 11 welds in 7 penetrations were repaired, defects were -

slag, porosity and tungsten.

-PT - 4 welds in 4 penetrations were repaired, type of detect unknown.

UT - 2 welds in 2 penetrations were repaired, type of defect unknown.

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