ML20071H457
| ML20071H457 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/24/1982 |
| 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 8203080423 | |
| Download: ML20071H457 (2) | |
Text
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l TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ol
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400 Chestnut Street Tower II m
,c February 24, 1982
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BLRD-50-438/81-37 3
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^d 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 - GE RELAY DEFICIENCY -
BLRD-50-438/81-37, BLRD-50-439/81 FINAL REPORT The subject deficiency was -initially reported to NRC-0IE Inspector R. V. Crlenjak on May 13, 1981, in accordance with 10 CFR 50.55(e) as NCR BLN EEB 8101. Tnis was followed by our interim reports dated June 12 and September 16, 1981. Snclosed is our final report. We consider 10 CFR Part 21 applicabAe 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 9Ih.
L.'M. Mills, Madager Nuclear Regulation and Safety Enclosure co q
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Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement O
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 l
GE RELAY DEFICIENCY BLRD-50-438/81-37, BLRD-50-439/81-40 10 CFR 50.55(e)
FINAL REPORT l
l Descriptier of Deficiency l
General Electric (GE) service advice letter PSM-721-152.2, HFA Relay Coils,
' dated November 21, 1980 identifies the potential for coil failure of GE type HFA relays manufactured between 1974 and 1979. The Lexan coil spools of these relays are susceptible to stress cracks and embrittlement caused l
by thermal aging and improper mixing of the Lexan. This nonconformance is significant in that a cracked coil spool could result in improper relay l
-function upon energization or deenergization of the relay. GE type HFA relays (66 Class IE and 38 non-Class IE) were furnished only in 6.9 kV and 13.8 kV switchgear supplied by Brown Boveri Electric, Incorporated (BBE),
on contract 75K5-85583 Safety Implications l
Failure of the subject relays could degrade the auxiliary power system or affect the operation of related components. This condition could adversely affect the safe operation of the plant.
Corrective Action TVA has accepted BBE's proposal to furnish the GE Century series coil with Terzel spool and high-temperature wire for replacement of existing hardware in HFA relays covered by this nonconformance. This corrective action is in accordance with GE's recommendation.
TVA will perform the labor to change out these coils. GE has changed the spool materials to Terzel on all HFA relays manufactured since January 1979 to correct this deficiency. BBE has furnished instruction manuals applicable to " Century Series" HFA relays. TVA has approved the instruction manuals and has initiated.necessary drawing revisions. Expected completion date for installation of replacement parts is December 10, 1982.
Other TVA nuclear projects are being surveyed to determine if relays manufactured during the time span stated in the GE service advice letter were supplied to these projects. This survey will be completed by June 16, 1982, and nonconformances written as required.
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