ML20077G666

Part 21 Rept Re Circuit Breakers Mfg Between Nov 1981 & Feb 1982.Breakers Should Be Inspected for Broken Puffer Linkage Studs.Stud Identified as Part Number 192247A.List of Circuit Breakers for Nuclear Plants Encl

ML20077G666
Person / Time
Site:	Sequoyah, Vogtle, 05000000, Hartsville, Yellow Creek
Issue date:	07/27/1983
From:	Duvall D BBC BROWN BOVERI, INC. (FORMERLY BROWN BOVERI CORP.
To:	Deyoung R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-83-946-000 PT21-83-946, PT21-83-946-000, NUDOCS 8308040379
Download: ML20077G666 (4)

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BBC BROWN BOvt m Brown Boveri electric, inc.

Manufacturer of I-T E Electrical Power Equipment July 27, 1983 Mr. R. C. DeYoung. Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. DeYoung:

Recently, Brown Boveri Electric has experienced some broken puffer linkage studs on 7.5HK and 15HK circuit breakers that were manufactured during January, 1982. These broken studs were found on circuit breakers used in non-nuclear applications, however the same design is used in nuclear appli-cations. In the area where the break occurred, a radius which is intended to relieve stress had not been maintained. Another possible cause of high stress and breakage in this type of heat treated alloy steel is hydrogen embrittlement. The material has been changed to one that is easier to heat treat and a larger radius has been specified.

Although the problem is probably limited to circuit breakers manufactured during January,1982, Brown Boveri Electric recommends that circuit breakers manufactured between November, 1981 and February, 1982 be inspected to determine if this condition exists. The stud is identified as Part Number 192247A.

A broken puffer linkage stud could result in a reduction in the effective-ness of the puffer system.

Production records indicate that 7.5HK and 15HK circuit breakers for Nuclear Power Plants were manufactured between November, 1981 and February, 1982 for Georgia Power Company (Vogtle Plant) and TVA (Yellow Creek, Hartsville and Sequoyah Plants). A list of these circuit breakers by serial number, for both Class IE and non-Class lE applications, is included as an appendix to this report. Only the circuit breakers identified in this list require in-spection. The other circuit breakers in the Sales Orders are acceptable for use as is.

The sam condition would not apply to the Brown Boveri Electric 5HK circuit bre 's. The ffer system on these circuit breakers is of a different des J j

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. D. L Vice President DDD/jm (lk Attachment i I cc: W. E. Laubach, E. W. Rhoads, L. M. Schmidt, J. R. Silverio, W. R. Wilhelm I300040379 830727 a itwie e sv.i.m.oivi. ion PDR ADOCK 05000327 spring House, PA 19477 e (215) 628 7400 0 PDR

Appendix to NRC Letter Dated 7/27/83 Page 1 lE BREAKERS

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.p 'l TVA (YELLOW CREEK) S.O. 54350 BREAKER SERIAL # TYPE DATE MFC.

54350D-2-02852 7.5HK 12/8/81 54350D-2-01852 7.511K 12/8/81 54350C-2-110839 7.5HK 12/8/81 54350D-2-05852 7.5HK 12/8/81 54350D-2-04852 7.5HK 12/8/81 54350D-2-03852 7.5HK 12/8/81 54350D-2-06852 7.5HK 12/8/81 54350D-2-07852 7.5HK 12/8/81 54350D-2-09852 7.5HK 12/8/81 543 SOD-2-08852 7.511K 12/8/81 54350D-2-10852 7.5HK 12/8/81 54350C-2-113839 7.5HK 12/8/81 54350A-4-01839 15HK 2/10/82 54350A-4-02839 15HK 2/10/82 54350A-4-03839 15HK 2/10/82 54350A-4-04839 15HK 2/10/82 54350B-4-04834 15HK 11/20/81 54350B-4-02834 1511K 11/19/81 54350B-4-03834 15HK 11/19/81 54350B-4-01834 15HK 11/19/81 q f TVA (HARTSVILLE) S.O. 52313 52313AF-203-02717 7.5HK 11/2/81 52313V-3-01717 7.5HK 11/2/81 52313AF-3-01765 7.5HK 11/2/81 a

GEORGIA POWER (V0GTLE) S.O. 51903 51903S-401-01880 15HK 2/25/82 51903P-401-01880 15HK 1/30/82 51903R-401-01880 15HK 2/26/82 51903T-401-01880 15HK 2/26/82

_. . ._ __ _ _ . _ . _ _ . _ _ - . _ _ . _ _ _ _ _ _ _.__ _ . _.._ _ ._ _ __ - - _ ~ _ _ __ _

! Appendix to NRC Letter Dated 7/27/83 NON-1E BREAKERS l

. TVA (YELLOW CREEK) S. O. 54471 BREAKER SERIAL # TYPE DATE MFG.

! 54471F-2-09836 7.5HK 12/12/81 i 54471E-2-08818 7.5HK 12/12/81

! 54471E-2-11818 7.5HK 12/12/81

!' 54471B-2-02793 7.5HK 12/12/81 54471B-2-10793 7.5HK 12/12/81 54471B-2-01793 7.5HK 12/12/81 i 54471B-2-04793 7.5HK 12/9/81 I 54471E-2-07818 7.5HK 12/9/81

] 54471E-2-08818 7.5HK 12/9/81 54471E-2-11818 7.5HK 12/9/81 4

54471B-2-02793 7.5HK 12/9/81

54471B-2-10793 7.5HK 12/9/81 54471B-2-01793 7.5HK 12/9/81

! 54471B-2-04793 7.5HK 12/9/81 j 54471D-1-01812 7.5HK 12/10/81

54471E-2-09818 7.5HK 12/8/81 i 54471E-2-06818 7.5HK 12/8/81 j 54471E-2-12818 7.SHK 12/8/81 54471B-2-03793 7.5HK 12/7/81 i 54471E-2-05818 7.5HK 12/7/81 54471D-1-02812 7.5HK 12/7/81 54471E-1-02794 7.5HK 12/7/81

,' 54471D-2-10791 7.5HK 11/12/81 54471D-2-02791 7.5HK 11/13/81 54471D-2-08791 7.5HK 11/16/81 54471D-2-07791 7.5HK 11/18/81 54471D-2-05791 7.5HK 11/18/81 54471D-2-09791 7.5HK 11/18/81 54471D-2-03791 7.5HK 11/19/81 54471C-1-02810 7.5HK 11/20/81 54471B-1-01794 7.5HK. 11/25/81 54471E-1-01794 7.5HK 11/25/81

- 54471C-1-01810 7.5HK 11/30/81 4

- 54471B-1-02794 7.5HK 11/30/81 54471F-1-02832 7.5HK 11/30/81 54471F-1-04832 7.5HK 11/30/81 54471E-2-03818 - 7.5HK 11/30/81 54471E-2-04818 7.5HK 11/30/81 54471E-2-10818 7.5HK 12/1/81 54471F-01832 7.5HK 12/4/81 54471E-02818 - 7.5HK 12/4/81 4

.54471F-03832 7.5HK 12/4/81 54471E-2-01818 7.5HK 12/3/81'

- 54471D-2-06791 7.5HK 11/3/81

- 54471D-2-01791 7.5HK 11/3/81 54471D-2-04791 -7.5HK= 11/3/81

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Appendix to NRC Letter Dated 7/27/83 Page 3 NON-1E BREAKERS GEORGIA POWER (V0GTLE) 8.0. 51903 BREAKER SERIAL # TYPE DATE MFG.

51903L-506-01860 1511K 1/20/82 51903L-507-01860 1511K 1/20/82 l;

TVA (SEQUOYAH) S.O. 54968 54968A-301-01843 7.5HK 12/9/81 l

TVA (SEQUOYAH) S.O. 54780 54780A-2-01748 7.5HK 11/13/81 54780A-4-01748 15HK 11/13/81 TVA (SEQUOYAH) S.O. 54801 54801A-12-02803 7.5HK 2/26/82 54801A-12-01803 7.5HK 2/26/82

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