JAFP-94-0571, Part 21 Rept Re Spare GE Molded Case Circuit Breaker.Breaker Overcurrent Trip Failed to Perform within Specified time- Current Curve.Defective Breaker Returned to GE for Evaluation

Part 21 Rept Re Spare GE Molded Case Circuit Breaker.Breaker Overcurrent Trip Failed to Perform within Specified time- Current Curve.Defective Breaker Returned to GE for Evaluation

ML20077C376
Person / Time
Site:	FitzPatrick
Issue date:	11/28/1994
From:	Harry Salmon POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-94 JAFP-94-0571, JAFP-94-571, NUDOCS 9412010280
Download: ML20077C376 (4)

Text

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United States Nuclear Regulatory Commission Document Control Desk Mail Station F1-137 Washington, D.C. 20555

SUBJECT:

DOCKET NO. 50-333 REPORTING OF DEFECT: 10 CFR 21 Spare Molded Case Circuit Breaker Failed overcurrent Test Criteria

Dear Sir:

This report is submitted in accordanco with 10 CFR 21. It reports a deviation from procurement specifications identified by the Authority during pre-installation testing of a circuit breaker which was in the warehouse inventory. ,

Questions concerning this report may be addressed to Mr. Donald Simpson at (315) 349-6361.

Very truly yours, HARRY P. SALMON, JR.

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(This report is provided under 10 CYR 21, Reporting of Defects and Noncompliance.

On 10/3/94, a spare General Electric molded caso circuit breaker, Type THJK, was being bench tested in preparation for installation in a safety related application. The breaker overcurrent trip failed to perform within the specified time-current curve. The breaker was not installed. A second breaker from spare parts inventory was bench tested with satisfactory results.

The defective breaker vaa returned to General Electric for evaluation.

General Electric concluded that the failure to identify this deviation was due to human error and was a one tiIte occurrence.

This deviation was identifled through routine adlninistrative controls in place at FitzPatrick. No further corrective actions arc planned.

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rAc Lirr u w (1) ocxxET uunart (2) LH ultep (O PAK (3) l Jamsa A. Fitzpatrick Nuclear TEAR SE AL RI Power Plant 05000333 02 OF 02 uxr cif w. oece ti ream.o. vee .mittenet cootes of nicans (173 Enrrative on October 3, 1994, a General Electric molded case circuit breaker was withdrawn from the warehouse spares and was being tested to confirm availability as a replacement for an installed breaker during an upcoming plant outage. The breaker is General Electric Catalog Number TILTK426400, Part Number DD188C8963P191, 2 Pole, 125VDC. The breaker was purchased as Safety Related "Q" equipment subject to the provisions of 10 CFR 50 Appendix B and was certified as a qualified replacement part for the specified application. Time current curves for the breaker were required as part of the order. The breaker was received by the Authority and placed in stock inventory in August, 1993.

Pre-installation testing, which is required by site maintenance procedures revealed that the breaker did not meet the time current characteristic required by the purchase order and as certified by the vendor. The breaker failure was nonconservative in that it remained closed beyond the time that it should have tripped. This occurrence is raported as a deviation under the provisions of 10 CFR 21.

The defective breaker was supplied by:

General Electric Company 175 Curtner Avenue M/C 853 San Jose, California 95125 If this breaker had been installed in the plant, the failure would have challenged the DC power system coordination scheme. There is no safety hazard related to this failure because all breakers in this application are tested prior to installation. This was confirmed through a records review.

A second breaker from stock inventory was tested with satisfactory results.

The failed breaker was rejected and returned to the vendor for failure evaluation.

The evaluation results, received on October 31, 1994, indicated that the breaker should not have been shipped based upon a review of dedication test results. Human error {Cause Code A}, inadequate review of test data, was the cause and was determined by the vendor to be a one time occurrence. No additional corrective actions are planned by the Authority.

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POWER REACTOR EVENT NUMBER: 28076-FACILITY: FITZPATRICK REGION: 1 NOTIFICATION DATE: 11/28/94 l UNIT: [1] [] [ ] STATE: NY NOTIFICATION TIME: 14:43 [ET] l RX TYPE: [1] GE-4 EVENT DATE: 10/03/94 )

EVENT TIME: 12 : 00 [EST)

NRC NOTIFIED BY: FACSIMILE LA$T UPDATE DATE: 11/28/94 l HQ OPS OFFICER: WILLIAM HUFFMAN NOTIFICATIONS EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION:

CDEG 21. 21 (c) (3 ) (i) DEFECTS / NONCOMPLIANCE UNIT SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE 1 N Y 65 POWER OPERATION 65 POWER OPERATION EVENT TEXT DEFECTIVE 125 VDC MOLDED CASE CIRCUIT BREAKER.

ON 10/03/94, A SPARE GENERAL ELECTRIC MOLDED CASE CIRCUIT BREAKER,' TYPE THJK, WAS BENCH TESTED IN PREPARATION FOR INSTALLATION IN A SAFETY RELATED APPLICATION. THE BREAKER OVERCURRENT TRIP FAILED TO PERFORM WITHIN THE SPECIFIED TIME-CURRENT CURVE. THE BREAKER WAS NOT INSTALLED. A SECOND BREAKER FROM THE SPARE PARTS INVENTORY WAS BENCH TESTED WITH SATISFACTORY RESULTS.

THE DEFECTIVE BREAKER WAS RETURNED TO GENERAL ELECTRIC FOR EVALUATION.

GENERAL ELECTRIC CONCLUDED THAT THE FAILURE TO IDENTIFY THIS DEVIATION WAS DUE TO HUMAN ERROR AND WAS A ONE TIME OCCURRENCE.

THIS DEVIATION WAS IDENTIFIED THROUGH ROUTINE ADMINISTRATIVE CONTROLS IN  :

PLACE AT FITZPATRICK. NO FURTHER CORRECTIVE ACTIONS ARE PLANNED.

A COPY OF THIS REPORT HAS BEEN SENT TO NRR/TQMB (HAASS).

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