ML20053A257
| ML20053A257 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 05/17/1982 |
| From: | Mclendon G LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, W3K-82-0278, W3K-82-278, NUDOCS 8205250146 | |
| Download: ML20053A257 (3) | |
Text
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ELM 3-A35.07.25 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 Subj ec t: Waterford SES Unit No. 3 Docket No. 50-382 Final Report of Significant Construction Deficiency No. 25
" Defective GE Circuit Breakers (AKR-30 and AKR-50)"
Reference:
LP&L letter to USNRC W3K-82-0192 dated April 1, 1982
Dear Mr. Collins:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 25, " Defective GE Circuit Breakers (AKR-30 and AKR-50)."
Very truly yours, e
GDMcL/LLB/grf Attachment cc:
- 1) Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies of report)
- 2) Director Of fice of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 g
(with I copy of report)
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5'lt 8205250146 820519 PDR ADOCK 05000382 S
LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT No. 3 Final Report of Significant Construction Deficiency No. 25
" Defective GE Circuit Breakers (AKR-30 and AKR-50)"
Reviewed by M,2 t.,A R. J. Milhi'se f-Site Manager Date Reviewed by J
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J C. Wills %
oject Superintendent Date Reviewed by khA f//c' fff]
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l 'hZ 4/ Hart - Project LJdens'ing Enginee'r Date 8~/3-8d Reviewed by W. Yaeger M.' fle dent 1ngineer Date Reviewed by
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~Q'. A. Sip Supervisor Date May 13, 1982'
FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 25
" DEFECTIVE GE CIRCUIT BREAKERS (AKR-30 AND AKR-50)"
INTRODUCTION This report is submitted pursuant to 10CFR50.55(e).
It describes potential failures in the General Electric AKR-30 and AKR-50 Low Voltage Power Circuit Breakers supplied to the Waterford 3 project. This problem is considered reportable under the requirements of 1CCFR50.55(e). To the best of our knowledge, this problem has not been identified to the Nuclear Regulatory Commission pursuant to 10CFR21.
DESCRIPTION General Electric AKR-30 and AKR-50 Lov Voltage Power Circuit Breakers purchased from GE between mid-1976 and December 19, 1980, have been tested by GE, and in a limited number of instances, the electronically operated AKR-50 Low Voltage Power Circuit Breakers have failed tc close upon command.
Failure occurred after the circuit breaker had been left in the charged position for several hours.
The cause of the failure was traced to deformation of a lead Teflon sleeve serving as a bearing in the breaker. GE was not aware of any failure in the AKR-30 Circuit Breakers, but the AKR-30 uses the same lead Teflon sleeve and may be subject to the same failure mode.
SAFETY IMPLICATIONS These breakers have been installed in the 480V switchgear.
Failure of these breakers to close can inhibit safety-related equipment from operating and thus compromise the safe shutdown of the plant.
CORRECTIVE ACTION Correct.ive action for the repair of the complete (86) AKR-30 and AKR-50 breakers has been completed.
The (5) breakers that were found to have other damage were repaired and reinstalled. GE representative witnessed the reinstallation and in-plant testing.
We are submitting this information as our Final Report to the USNRC.
1
LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT No. 3 Final Report of Significant Construction Deficiency No. 25
" Defective GE Circuit Breakers (AKR-30 and AKR-50)"
Reviewed by
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R. J. Milhfsef-Site Manager Date-Reviewed by
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J L'. Wills'%
oject Superintendent Date Y
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Reviewed by F Hart - Project LJdensing Enginee'r Date 8~/3~8d Reviewed by i
W. Yaeger M C lte ' dent Tngineer Date
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Reviewed by
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J.[ utierrds - Q'. A. Sip Supervisor Date May 13, 1982 i
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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY No. 25 l' DEFECTIVE GE CIRCUIT BREAKERS (AKR-30 AND Ma-50)"
INTRODUCTION
-This report is' submitted pursuant to 10CFR50.55(e).
It describes potential failures in the General Electric AKR-30 and AKR-50 Low Voltage Power Circuit Breakers supplied to the Waterford 3 project.
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 Nuclear Regulatory Commission pursuant to 10CFR21.
DESCRIPTION Ceneral Electric AKR-30 and AKR-50 Low Voltage Power Circuit Breakers purchased from GE between mid-1976.and December-19, 1980, have been tested by GE, and in a limited number of instances, the electronically operated AKR-50 Low voltage Power Circuit Breakers have failed to close upon command.
Failure occurred after the circuit breaker had been left in-the charged position for several hours. The cause of the failure was traced to deformation of a lead Tefinn sleeve serving as a bearing in the. breaker. GE was not aware of any failure in the AKR-30 Circuit Breckers, but the AKR-30 uses the same lead Teflon sleeve and may be subject to the same failure mode.
SAFETY IMPLICATIONS These breakers have been installed in the 480V switchgear.
Failure of these breakers to close can inhibit safety-related equipment from operating and thus compromise the safe shutdown of the plant.
CORRECTIVE ACTION Corrective action for the repair of the complete (86) AKR-30 and AKR-50 breakers has been completed. The (5) breakers that were found to have other damage were repaired and reinstalled. GE representative witnessed the reinstallation and in-plant testing.
We are submitting this information as our Final Report to the USNRC.
l
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