ML20042B947

Interim Significant Const Deficiency 47 Re GE AKR-30/50 Circuit Breakers Closing Spring Screw.Caused by Omission of Thread Locking Compound.Locktite Applied & Three Screws Replaced

ML20042B947
Person / Time
Site:	Waterford
Issue date:	03/15/1982
From:	Mclendon G LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, W3K-82-0146, W3K-82-146, NUDOCS 8203260319
Download: ML20042B947 (5)

Text

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r LOUISIANA 24a ouAnONoE Sinur POWER & LiGH f P O BOX 6008

• NEW ORLEANS. LOUIS!ANA 70174 * (504) 366-2345

[IrNUs'ysSIO March IS, 1982 G. D. McLENDON Senoor Vice President W3K-82-0146 Q-3-A35.07.47 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 SUBJ ECT: Waterford SES Unit No. 3 Docket No. 50-382 Interim Report of Significant Construction Deficiency Jo. 47

" General Electric AKR-30/50 Circuit Breakers Closing Spring Screw"

Reference:

Telecon - R. G. Bennett (LP&L) to L. Martin (NRC) on hovember 12, 1981

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copics of the Interin. Report of Significant Construction

Deficien-v No. 47, " General Electric AKR-30/50 Circuit Breakers Closing " -

Spring Screw." @ q, If you have any questions, please advise. // gi.} S P.b'g

( Very truly yours, g gB 7 --

, ro GDMcL/LLB/grf CP Cb l N Attachment cc: 1) Director Office of Inspection & Enforcement 3hhh l"

U. S. Nuclear Regulatory Commission N22N i Washington, D. C. 20555 I  !

(with 15 copies of report) l u l 2) Director m_ } _ t/ _ _ _ -

l Office of Fhnacement Information a rogram Control U. S. Nuclear Rugulatory Commission Washington, D. C. 20555 f.f l (with I copy of report) 61 l 9203260319 820315 PDR ADOCK 05000382 PDR L g I

I LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT No. 3 Interim Report of Significant Construction Deficiency No. 47 General Electric AKR-30/50 circuit Breakers Closing Spring Screw Reviewed by -

" 7 /# //18 R. J. Milfriser - Site Manager Date Reviewed by '

/0/[2--

J/ LI Wil Project Superintendent Date Reviewed by _ //A.  % 2*d0' b Date J. lart - Proj6ct Licensing Engineer Reviewed by N J~ /0 ~ d W. Yaeger' - St. Resident Engineer Date Reviewed by 10 I 2-J. Gutierkez - Q. A. Site Supervisor Date i March 10, 1982

INTEREH REPORT SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 47 GENERAL ELECTRIC AKR-30/50 CIRCUIT BREAKERS CLOSING SPRING SCREW INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a defect with the AKR-30/50 circuit breaker. The problem is a possible failure of the circuit breaker to recharge the closing spring. This problem is considered reportable under the requirements of 10CFR50.55(e). To the best of our knowledge, this problem has not been identified to the USNRC pursuant to 10CFR21.

DESCRIPTION General Electric Service Advice 175-9.7 advised of potential problems with the AKR-30/50 circuit breaker which resulted from an intermittent omission of thread locking compound on a flat head screw on the lower end of the closing spring assembly. This omission could result in the screw interfering with the charging of the circuit breaker's closing spring, thus keeping the breaker from closing. i SAFETY IMPLICATIONS During field inspections, it was confirmed that the flat head screws on the clos-ing spring circuit breaker assembly were found " backed out" in three instances.

We therefore conclude that the failure of subject breakers could adversely affect the equipment important to safety if left uncorrected. This would be in conflict with the intent of Criterion 17 of 10CFR50 Appendix A and therefore is reportable.

CORRECTIVE ACTION A field inspection was performed on all AKR-30/50 breakers (78) on site. Of this number, three (3) flat head screws were found to be " backed out" and one (1) flat head screw was found broken off. This one flat head screw fouad broken off has been documented on Nonconformance Report W3-3541. Locktite was applied, and the three screws were reinstalled and torqued to 60 inch-pounds. A replacement screw has i been ordered. Delivery date is not known at this time.

In view of the above, we estimate final completion of corrective action to be not later than April 30, 1982, and a Final Report submitted to the USNRC at that time.

Reference:

Nonconformance Report W3-3180.

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LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT NO. 3 Interim Report of Significant Construction Deficiency No. 47 General Electric AKR-30/50 circuit Breakers Closing Spring Screw Reviewed by 4 '

? g//1 <

R. J. MiliMser - Site Manager Date Reviewed by 3//o#2_.

Date J/ LI Wil Project Superintendent

% ,,,ur(~ + 00* IO Reviewed by -

/ MfL J. Tiart - Proj6ct Licensing Engineer Date Reviewed by k .8 ~ /0 ~ d W. Yaeger'- St. Resident Engineer Date Reviewed by W 10 37

, J. Gutierkez - Q. A. Site Supervisor Date tiarch 10, 1982

INTERIM REPORT SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 47 GENERAL ELECTRIC AKR-30/50 CIRCUIT BREAKERS CLOSING SPRING SCREW INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a defect with the AKR-30/50 circuit breaker. The problem is a possible failure of the circuit breaker to recharge the closing spring. This problem is considered reportable under the requirements of 10CFR50.55(e). To the best of our knowledge, this problem has not been identified to the USNRC pursuant to 10CFR21.

DESCRIPTION General Electric Service Advice 175-9.7 advised of potential problems with the AKR-30/50 circuit breaker which resulted from an intermittent omission of thread locking compound on a flat head screw on the lower end of the closing spring assembly. This omission could result in the screw interfering eith the charging of the circuit breaker's closing spring, thus keeping the breaker from closing.

SAFETY IMPLICATIONS During field inspections, it was ccnfirmed that the flat head screws on the clos-ing spring circuit breaker assembly were found " backed out" in three instances.

We therefore conclude that the failure of subject breakers could adversely affect the equipment important to safety if left uncorrected. This would be in conflict with the intent of Criterion 17 of 10CFR50 Appendix A and therefore is reportable.

CORRECTIVE ACTION A field inspection was performed on all AKR-30/50 breakers (78) on site. Of this number, three (3) flat head screws were found to be " backed out" and one (1) flat head screw was found broken off. This one flat head screw found broken off has been documented on Nonconformance Report W3-3541. Locktite was applied, and the three screws were reinstalled and torqued to 60 inch-pounds. A replacement screw has been ordered. Delivery date is not known at this time.

In view of the above, we estimate final completion of corrective action to be not later than April 30, 1982, and a Final Report submitted to the USNRC at that time.

1

Reference:

Nonconformance Report W3-3180.

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