ML19241A364

Forwards Interim Deficiency Rept 1 Re Gross Failure Output Function of Trip Units

ML19241A364
Person / Time
Site:	Grand Gulf
Issue date:	06/20/1979
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19241A365	List: ML19241A364 ML19241A366
References
FOIA-81-159 AECM-79-64, NUDOCS 7907190523
Download: ML19241A364 (1)

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Y MISSPSIPPI POWER & LIGHT COMPANY Helping Build Mississippi 2"': S d P. O. B O X 16 4 0. J A C K S O N. MISSISSIP?! 39205

• =o ouctio ~ o c a.oru r ~ r June 20, 1979 office of Inspect'an & Enforcement U. S. Nuclear Regulatory Cor. mission Region II 101 Marietta Street, N. W. - Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

Dear Sir:

Grand Gulf Nuclear Ztation File 0260/15521/15525 Interim Report No. I for PRD 79/10 As Defined in 10 CFR 50.55(e)

AECM-79/64 On May 21, 1979, Mississippi Power & Light Company notified Mr. D. S.

Pric.e of your office of a potentially reportable deficiency at the Grand Gulf Nuclear Station construction site. The deficiency concerns a problem with the gross f ailure output function of both the Master and Slave Trip Units of the Rosemount Model 510 DU Trip Calibration System. Re have de-termined that this ;atter is reportable within the meaning of 10 CFR 50.55 (e).

Details of the latest findings are describe 3 in the attached interim report and we expect to submit a final repor by November 16, 1979.

Yours truly, WW L. F. Da le Nuclear Projact Manager 415 347 JRF:pa Attachment cc: Mr. T. B. Conner bec: Dr. D. C. Gibbs Mr. R. B. McGehee Mr. A. 7,accaria Mr. J. N. Ward Mr. John G. Davis, Directot4[ THIS COPY FOR Mr. D.M. Lake Division of Inspection & Enforcement Mr. R. L. Scott U. S. Nuclear Regulatory Commission Mr. J. P. McGaugby Washington, D. C. 20555 Mr. W. L. Nail Mr. T. E. Reaves Mr. C. K. McCoy Mr. F. W. .,1 y Potential Reportable Deficiency File c

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Member Middle S 3uth Utilities System hI l