ML20033D261
| ML20033D261 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/02/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112070455 | |
| Download: ML20033D261 (2) | |
Text
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o TENNESSEE VALLEY AUTHO j C Rggjg;;
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CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II December 2, 19 & 0 A 0 - ]L 4
BLRD-50-439/81-64 Mr. James P. O'Reilly, Director b
Office of Inspection and
- nforcement i
DE07 1989
[e U.S. Nuclear Regulatory Commission Region II - Suite 3100
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- y 101-Marietta Street
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Atlanta, Georgia 30303 lM
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 2 - LAP INDICATION ON NAVC0 SPOOL PIECE -
BLRD-50-439/81 REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Celenjak on October 8, 1981 in accordance with 10 CFR 50.55(e) as NCR 1592. This was followed by our final report dated November 3,1981.
As discussed with R. V. Crlenjak by telephone on November 23, 1981, enclosed is our revised final report. The reason for the revision is to clarify the corrective action of the original report as the pipe has not been replaced as indicated. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mi.ls, Manager Nuclear}egulationan n
.fety-V l.
Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosr?e)-
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555'
- 9h71GIAL COPY,:
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- An Equal Ooportunity Employer
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ENCLOSURE BELLEFONTh NUCLEAR PLANT UNIT 2 LAP 1NDICATION ON NAVC0 SPOOL PIECE i
BLRD-50-439/81-64 l
REVISED FINAL REPORT 10 CFR 50.55(e)
{
- i Description of Deficiency During weld preparation, TVA found an unacceptable lap-type indication in f
an ASME III Class 3 piping subassembly which was supplied to TVA by the
{
National Valve and Manufacturing Company (NAVCO), Pittsburgh, i
Pennsylvania. The subassembly is a 6-inch, schedule 160, ASME SA 106 GR B pipe with mark number 2CA-28, which is part of the Auxiliary Feedwater (AFW) System. The lap indicstion depth was measured at 3/32", which exceeds the depth allowed by the material specification. The measured depth is below TVA-calculated minimum wall thickness of 0.6241" by
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0.0039".
The indication is therefore considered a " defect," as defined by the ASME Code.
}
Safety Implications i
f The subject spool piece is located on the discharge side of the motor-i driven pump on the AFW System. Should the AFW System be actinted and the l
turbine-driven pump not be operational, a failure cf this sr6 piece could j
reduce the feedwater supply. This could result ir, an excessivu thermal transient in the steam generator which may adversely impact the Reactor l
Cooling System.
i Corrective Action l
TVA will replace the defective portion of pipe wi h new pipe by December 31, 1981. Lap type indications are char..cteristic of seamless
)
c carbon-steel pipe. TVA has identified only two indications (one l
significant, one nonsignificant) of this type out of approximately.10,000 spool pieces supplied to Bellefonte by NAVC0 of which approximately 60 percent have been installed. Visual examinations performed by TVA welding inspectors, before welding, would reveal the existence of similar deficiencies.
NAVC0 has been notified of this deficiency and TVA concurs with the l
assessment that this does not indicate a generic breakdown of NAVCO's QA l
program. Consequently, there are no actions to prevent recurrence.
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