ML20085D122

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Responds to Re Faulty Overcurrent Trip Delay Devices.Facility Presently in Refueling Condition. Overcurrent Trip Device Will Be Replaced During Outage.Task to Be Complete by 730501
ML20085D122
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 04/26/1973
From: Bessac N
CAROLINA POWER & LIGHT CO.
To: Jennifer Davis
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20085D120 List:
References
NUDOCS 8307200496
Download: ML20085D122 (1)


Text

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be Carolina Power & Light Company

  • April 26, 1973 Mr. J. G. Davis, Director Directorate of Regulatory Operations U. S. Atomic Energy Commission Region II - Suite 818 230 Peachtree Street, N.W.

Atlanta, Georgia 30303

Dear Mr. Davis:

H. B. ROBINSON UNIT NO. 2

, LICENSE DPR-23 R0:II:50-261 FAULTY OVERCURRENT TRIP DELAY DEVICE IN CIRCUIT BREAKERS FOR ENGINEERED SAFETY SYSTEMS This letter is in response to your letter dated February 21, 1973, concerning faulty overcurrent trip delay devices. All safeguard equipment circuit breakers.at the H. B. Robinson Unit No. 2 plant were inspected in July, 1972, as a result of information received from Westinghouse concerning failures of DB-50 overcurrent trip devices at ather operating nuclear facilities.

Inspection and tests at that time showed no defects except for one C.V. spray pump breaker which had a sluggish plunger. This deficiency was s corrected and the breaker returned to service in satisfactory operating condition. On November 3, 1972, the Plant Nuclear Safety Committee received a letter from Westinghouse concerning replacement of type DB-50 overcurrent trip devices. As a result, the Plant Nuclear Safety Committee recommended ,

that the overcurrent trip devices be replaced on the safeguards breakers during the refueling outage.

We are presently in a refueling condition and plan to replace the overcurrent trip devices during this outage. This task should be completed by May 1, 1973. -

Yours very truly,

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