ML19345F448

Part 21 Rept Re Linear Surface Defects in Guyon Alloy Us Steel Pipe,Initially Reported on 801003.Cracked Pipe Has Been Rejected.Insp Revealed No Other Cracks

ML19345F448
Person / Time
Site:	Phipps Bend
Issue date:	01/30/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-81-356-000 10CFR-050.55E, 10CFR-50.55E, PT21-81-356, PT21-81-356-000, NUDOCS 8102170503
Download: ML19345F448 (4)

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TENNESSEE VAIEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II

,. January 30, 1981 tb-ses.

sw Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

PHIPPS BEND NUCLEAR PLANT - REPORTABLE DEFICIENCY - U.S. STEEL PIPE WITH LINEAR INDICATIONS (NCR PBNP 154)

Initial notification of the subject deficiency was cade to NCR-DIE Region II Inspector R. W. Wright on October 3, 1980. TVA submitted the first interim report on November 3, 1980. In compliance with paragraph 50.55(e) of 10 CFR Part 50, we are enclosing the final report on the subject deficiency. We consider 10 CFR Part 21 applicable to this nonconformance. If you have any questions, please call" Jim Domer at FTS 857-2014.

Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager .

Nuclear Regulation and Safety Enc 1cisurc cc: Mr. Victor Stello, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Co= mission Wasnington, DC 20555 An Equal Opportunity Em;: toyer

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i ENCLOSURE PHIPPS BEND NUCLEAR PLANT UNITS 1 AND 2 U.S. STEEL PIPE WITH LINEAR INDICATIONS 10CFR50.55(e) NCR PBNP-154 REPORT NO. 2 (FINAL)

Description of Deficiency Three heats of seamless eight-inch Schedule 80 SA106B (heat Nos.

L62448, L63651, and L63647) purchased from Guyon Alloys under contract to TVA had displayed linear surface defects and possible cracks. The largest linear indication was 10 feet in length; there was one crack which penetrated 80 percent of the pipe wall thickness.

Safety Implications Cracked piping such as the one mentioned above could not reliably perform to ' meet design requirements, and therefore could possibly affect the safety of operation. Other linear indications previously referred to as " cracks" have been identified as external surface laps. The depth of these laps is actually less than 5 percent of the wall thickness. The laps could not affect normal operation or degrade the safety of plant operations.

Corrective Action The material purchased under the provisions of contract No.

s 78KA3-822825 included ASME III class 2 -8.675" o.d. Schedule 80 seamless SA106B pipe. The heat numbers in question were L62448 (575 '-0"), L63651 (1852 '-11"), and L63647 (626 '-7"). The vendor responsible for supplying this material is Guyon Alloys, Incorporated, located in Harrison, New Jersey. The piping was fabricated by U. S.

Steel, located in Loraine_, Ohio.

• Since the crack which had penetrated 80 percent of the wall thickness had been removed by grinding, TVA, Guyon, and U.S. Steel were unable l to determine its cause. The pipe containing this crack has since been l

rejected. Inspection of the several other indications of concern revealed that there were no other cracks. The defects examined were actually laps which fell into the acceptable range in the context of SA106B.

A TVA review of piping of. this size, class, and of the particular material in question reveals that surface linear defects such as laps and seams are both com=on and,- in most cases, insignificant. Howev.er, in order to assure l that the subject pipe meets the requirements for ASME SA-106 pipe, TVA will

! take the following steps:

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1. Those surface imperfections (laps, seams) which intersect the weld must be removed to a distance of approximately four inches from the weld so that they do not interfere with subsequent inspection.

2. Those imperfections in 1. above which exceed one foot in length should be explored at two additional randomly selected locations.

3 Surface imperfections that penetrate more than 121/2 percent of the nominal vall thickness will result in the rejection of the pipe.

4. Anysurhaceimperfectionwhichisdeeperthan5percentofthe nominal wall thickness shall be explored for its entire length and evaluated to 3. above.

5. All cracked piping will be rejected. ,

6. If at any time greater than 5% of a representative sample of a heat of pipe is rejectable, EN DES will be notified for further disposition.

TVA Construction Specification G29M was revised to clarify this area of concern. Process Specification 3.M.5.1, paragraph 5.0, in G29M will be clarified in a future r.evision to enable site personnel to core readily deal with similar defects in both this and oth.er caterials.

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