ML20085D301

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Responds to Re Review of Control Circuits & Procedures on safety-related Equipment.Investigation Reveals That Disabling & Racking Out Breaker of One Component Does Not Render Redundant Components Inoperable
ML20085D301
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 02/27/1973
From: Utley E
CAROLINA POWER & LIGHT CO.
To: Skovholt D
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085D305 List:
References
NUDOCS 8307210120
Download: ML20085D301 (1)


Text

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s o o S0~Eb 1 Carolina Power & Light Company l l

February 27, 1973 Mr. D. J. Skovholt Assistant Director of Operating Reactors Directorate of Licensing U. S. Atomic Energy Commission '

Washington, D. C. 20545 H. B. ROBINSON UNIT NO. 2 LICENSE DPR-23 SAFETY EQUIPMENT CONTROL CIRCUIT DESIGN

Dear Mr. Skovholt:

In response to your letter dated December 22, 1972, we have con-ducted a review of control circuits and procedures on all safety related equipment at Robinson Unit No. 2. Our investigation has shown that disabling and racking out the breaker of one component does not render l redundant components inoperative. In addition to the circuitry review, a containment vessel spray pump was successfully test operated with the +

redundant pump breaker racked out, confirming the results of our investigation. t Plant operating procedures for safety related equipment provide that, when a portion of a redundant system is to be removed from service, the portion remaining in service be demonstrated to be operable prior to initiating repairs. i This procedure will be revised to require that the demonstration of operability be performed immediately after the affected equipment has been disabled.

Very truly yours,

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E. E. Utley Vice President '

Bulk Power Supply

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