ML20054E361
| ML20054E361 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/01/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8206110128 | |
| Download: ML20054E361 (2) | |
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TENNESS.EggLEY. AUTHORITY cH ATra qq4.,TENntsste 374oi 400 Chestnut Street Tower II-i' n8 03 3?. J w 3 June i, 1982 BLRD-50-438/82-35 BLRD-50-439/82-32 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 - OPERATIONAL DEFECTS IN HIOH-PRESSURE INJECTION N0ZZLES AND THERMAL SLEEVES - BLRD-50-438/82-35, BLRD-50-439/82 FIRST IlffERIM REPORT i
l The subject deficiency was initially mported to NRC-0IE Inspector Don Quick on April 29, 1982 in kccordance with 10 CFR 50.55(e) as NCR l
BLN NEB 8206. Enclosed is our first interim mport. We expect to submit our next sport by July 28, 1982. We consider 10 CFR Part 21 applicable to -
this deficiency.
l If you have any questions concerning this matter, please get in touch with l
R. H. Shell at Frs 858-2688.
-Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing t
Enclosure
-i oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 cc:
Mr. James McFarland Senior Project Manager Babcock & Wilcox Company P.O. Box:1260
,CO?b,;
Lynchburg, Virginia 24505 OFN t-820611012e 87 gDR ADOCK o h k3g PDR An Equal Opportunity Employer
h ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 OPERATIONAL DEFECTS IN HIGH-PRESSURE. INJECTION N0ZZLES AND THERMAL SLEEVES NCR BLN NEB 8206 BLRD-50-438/82-35, BLRD-50-439/82-32 10 CFR 50.55(e)
FIRST INTERIM REPORT Desce"otion of Deficiency Recent inspections at several B&W operating plants revealed defects in the makeup /HPI nozzles and their thermal sleeves and in the makeup piping upstream of these nozzles. The nozzles are located on each reactor coolant cold leg bet';een the reactor coolant pump and reactor vessel. The nozzles and sleevea are supplied by B&W under the Nuclear Steam Supply System (NSSS) contract. The defects include:
. through-wall circumferential crack at the welded joint between the nozzle safe end and the first check valve upstream of the safe end
. loose thermal sleeves 5
. missing or worn thermal sleeve retaining buttons The loose thermal sleeves and missing or worn retaining buttons remove the mechanical restraints which were designed to avoid exposing the nozzle and pipe to a thermal shock condition by preventing sleeve movement in the upstream direction.
Although the degraded components at the affected plants were the same, the resulting damage was not identical. Accordingly, B&W is investigating this concern to determine its cause and to determine if it has generic implications for other B&W plants, including Bellefonte. The Bellefonte nozzle configuration is similar to that at the affected plants except that
(
it is a one-piece construction while the nozzles for the affected plants have a welded safe end. B&W has notified TVA of no similar potential deficiencies in the past for other Bellefonte NSSS nozzles. There are no implications for other TVA plants.
Interim Progress TVA has forwarded the nonconformance report to B&W for corrective action.
TVA has advised B&W that any necessary corrective action is to be l
implemented before plant startup.
l TVA will report further information when a response is provided from B&W.
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