ML20128F268
| ML20128F268 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 04/25/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-85, REF-PT21-85-258-000 PT21-85-258, PT21-85-258-000, NUDOCS 8505290607 | |
| Download: ML20128F268 (2) | |
Text
r' n
a '
TENNESSEE VALLEY AUTHORITY (fg//p CHATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II
%g7 April 25, 1985
~
,98.
BLRD-50438/82-37
- g BLRD-50439/83-08 8
-U.S. Nuclear Regulatory Commission RegLon II Attn:
Dr. J. Nelson Grace, Reglonal Adninistrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgta 30323-
Dear Dr. Grace:
BELLEFWTE NUCLEAR PLANr WITS 1 AND 2 - FAILURE T B.I.F. BUITEFLY VALVE SEATS - BLRD-50438/82-37, BLRD-50439/83 SEVENTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on May 11, 1982 in accordance with 10 TR 50.55(e) as NCR 1819 This was followed by our interim reports dated June 8, and October 29, 1982; February 8, May 25, and July 28, 1983; and September 18, 1984.
Related NCRs 2170, 2186, and 2187 were included in our second interim report and NCR 2231 was included in our fourth interim report.
Enclosed is our seventh interim report. We expect to subnit our next report on cr about August 27, 1985. We consider.10 TR 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 AUrHORITY 8 7722/l eJ. W. Hufham, Manager Licensing and Regulations Enclosure cc:
Mr. James Taylor, Dimotor (Enclosure)
Office of Inspection and Enforoement U.S. Nuclear Regulatory Canaission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100. Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8505290607 850425 ADOCK 0500 8
gDR b
i
- ~~
9 '1 e
ENamURE BELLEFQiTE NUCLEAR PLANP UNITS 1 AND 2 i
FAILURE CF B.I.F. BUTTEIFLY V ALVE SEATS
}
NCRs 1819, 2170, 2186, 2187,2231 t
BLRD-50-438/82-37, BLRD-50-439/83-08 10 CFR 50.55(e)
SEVENTH INTERIM REPORT Description of Deficiency The following butterfly valves, manufactured by Ihsics Inflow Incorporated (BIF) a unit of General Signal Corporation, West Warwicko, Rhode Island, which are used in the Essential Air System were determined to be leaking in excess of an acceptable rate.
BIF Serial UNID Ntimber Mark No.
Contract No.
Item No.
Nucber 1 RJ-VTAC-50B 3BWO471-00-20 76K 38-86163-3 577 N-4 9445-10 1 RJ-VTA C-44 B 3BWO471-00-15 76K38-8 6163-3 576 N-4 9444-7 1 RJ-VTA C-27A 3 BWo471-00-15 76K38-86163-3 576 N-4 9444-2 Further investigation revealed that the rubber seats had failed because of damage, i.e., the seats were cut and portions were missing. The cause of the damage was not apparent.
Interim Progress All of the damaged valve seats have been replaced either by TVA or BIF.
TVA is presently planning a test program to spot check leakage rates on recently repaired valve seats to determine the adequacy of the replacement seats. IVA will provide the root cause and correspnding actions required to prevent recurrence of similar deficiencies in the final report.
O O
l u
,,,l l
- _____________ __ _