ML20071B666
| ML20071B666 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/18/1983 |
| 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, NUDOCS 8302280499 | |
| Download: ML20071B666 (3) | |
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.a TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ol 400 Chestnut Street Tower II co February 18, 1983'
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U.S. Nuclear Regulatory Commission l;
Region II
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Attn:
Mr. James P. O'Reilly, Regional Administrator-101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - TUBE LEAKS IN COMPONENT COOLING WATER HEAT EXCHANGERS - BLRD-50-438/83-15, BLRD-50 '439/83 FIRST INTERIM ~ REPORT
.The subject deficiency was initially reported to NRC-0IE Inspector D. M. Ve: relli on January 24, 1983 in accordance with 10 CFR 50.55(e) as i
NCR 2174. Enclosed is our first interim report. We expect lto submit our next report by June 3, 1983 If you have any questions, please get in touch with R. H. Shell at FIS 858-2688.
'Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Marager
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Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Commission Washington, D.C.
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8302280499 830218
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PDR ADOCK 05000438 ry.
S PDR gh An Equal Opportunity Employer
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ENCLOSURE c
BELLEPONTE NUCLEAR PLANT UNITS 1 AND 2 TUBE LEAKS IN COMPONENT COOLING WATER HEAT EXCHANGERS SUPPLIED BY BABC0CK AND WILCOX BLRD-50-438/83-15, BLRD-50-439/83-11
'NCR 2174 10 CFR 50.55(e)-
l FIRST INTERIM RPEORT:
Description of Deficiency The component cooling water (CCW) coolers are straight tube heat
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exchangers with essential raw cooling water (ERCW) circulated through the L
tube side. The CCW coolers are in the main flow path for the ERCW l
system. ERCW has been periodically circulated through the CCW coolers to l
provide cooling water to other components. Tube leaks have developed in the loop A cooler in both units 1 and 2.
No leaks have yet been. detected in the loop B coolers. Before beginning this periodic ERCW circulation, the CCW coolers were hydrotested at Bellefonte, and none of the CCW l
coolers had leaking tubes at that time. -
i The cause of the leaks has not yet been determined. However, the inner tube walls appear to be corroding and pitting. - Further investigation-- - ------
will be required to determine if this deficiency has generic implications. There have been no similar deficiencies in the past for other Bellefonte heat exchangers supplied by B&W under the nuclear steam l
supply system contract.
Interim Progress TVA has forwarded the NCR to B&W for corrective action. TVA and B&W are working to determine the cause of the leaks. The unit 1 CCW coolers will
- be examined to determine the extent of the tube leakage there. The unit 2 CCW cooler has tube leaks as shown on the attached sketch (attachment 1).
Tubes marked in black have definite _ leaks somewhere in the length of the tube. Tubes marked with an "X" showed evidence of leakage around the rolled joint between the tube and tube sheet and also could have a leak y
in the length of the tube. As part of the overall effort, two leaking l
tubes from each cooler will be pulled and metallurgical tests will be performed on them. Then, an eddy current test will be performed on 15 to 20 percent of the tubes to determine the extent and pattern of leaks.
Based on the result of the eddy current test, a tube with representative
<tamage will be pullsd for further metallurgical examination.
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