ML20086B110

Ao:On 711130,alarm on Radiation Monitoring Sys Indicated That Sample HX Developed Leak.Defective HX Replaced. Westinghouse to Investigate Repeated Failures & Make Recommendations Re Adequate Design for Sample HX

ML20086B110
Person / Time
Site:	Robinson
Issue date:	12/21/1971
From:	Utley E CAROLINA POWER & LIGHT CO.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086B087	List: ML20086B095 ML20086B103 ML20086B110
References
NUDOCS 8311170058
Download: ML20086B110 (1)

Text

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Dr. Peter A. Porris

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Division of Reactor Licensing U. S. Atomic Energy Commission y b Washington, D. C. 20545 H. B. ROBINSON STEAM ELECTRIC PLANT LICENSE DPR-23 FAILURE OF SAMPLE IIEAT EXCHANGER

Dear Dr. Morris:

In accordance with paragraph 6.6.1.C, Technical Specifications, the following abnormal occurrence is reported.

On November 30, 1971 an alarm on the Radiation Monitoring System indicated that a sampic heat exchanger had developed a leak. The pres-surizervaporspacesampleheatexchanger'wasisolatedagdtheactivity in the Component Cooling System stcbilized at 2.45 x 10- pc/ml. The defective heat exchanger was replaced on December 3,1971, returning all sampic heat exchangers to service. There was no release of activity to the environment as the Component Cooling System is a closed system.

This is the third failure of a sample heat exchanger at the H. B. Robinson Plant (August 22, 1971, November 24, 1971 and November 30, 1971).

Westinghouse Electric Corporation has been requested to investigate these repeated failures and to make recommendations to Carolina Power & Light Company as to the adequacy of the design of sampic heat exchangers, i

Yours very truly,

[ I E. E. Utley Q h ~~ Manager

! C 'f Cencration & System Operations f

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, cc: Mr. C. D. Barham I. Mr. G. P. Beatty &

Mr. N. B. Bessac y I

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