ML20054H463
| ML20054H463 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/18/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 50-439-82-24, NCR-1725, NRC-1725, NUDOCS 8206240083 | |
| Download: ML20054H463 (2) | |
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TENNESSEE VALLEY AUTHORITY O
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June 18, 1982 4g: Ic BLRD-50-438/82-27 BLRD-50-439/82-24 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - INSOLUBLE GLUE USED FOR PURGE DAMS IN STAINLESS STEEL PIPING - BLRD-50-438/82-27, BLRD-50-439/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector R. V. Crlenjak on March 22, 1982 in accordance with 10 CFR 50.55(e) as NCR 1725. This was followed by our first interim report dated April 22, 1982. Enclosed is our second interim report. We expect to submit our next report by September 20, 1982.
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 D S Ne~
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% L. M. Mills, Manager i
Nuclear Licensing l
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 I
l 8206240083 820618
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a ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 INSOLUBLE GLUE USED FOR PURGE DAMS IN STAINLESS STEEL PIPING NCR 1725 BLRD-50-438/82-27, BLRD-50-439/82-24 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency Some glue used in installation of purge dams in stainless steel piping has proved insoluble during flushing activities, and minor glue residual remains in piping at purge dam locations. This problem was anticipated during the resolution of NCR 835. The disposition of NCR 835 directed discontinuing the use of Elmers Glue-All and recommended using Elmers School Glue. The insoluble glue residual has been identified as Elmers Glue-All used before nonconformance report (NCR) 835 and Elmers School Glue that has been affected by heat from welding activities. When purge dams are located too close to the welds,.the currently used and normally soluble Elmers School Glue will char and become insoluble.
Interim Progress A five percent solution of acetic acid will be recirculated through the system piping on a trial basis for the removal of purge dams. A system that has not been previously flushed will be selected for the acetic acid flush demonstration. Several purge dams in the first system to be flushed with acetic acid will be visually inspected and photographed (if possible) before flushing, and again after the flushing. This will provide important evidence on the effectiveness of acetic acid. No temperature criteria will be established for the acetic acid flushes. However, the effectiveness should improve. with higher temperatures. The duration of the flush will be 12 to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The duration will be adjusted based on field experience.
Also, TVA performed metallurgical analysis on stainless steel pipe beneath typical purge dam materials'placed immediately adjacent to the weld joint during the welding of the joint. This appears to represent a worse case than has been found at the construction site. The stainless steel material in this area exhibited no detrimental effects from the purge dam material.
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