ML19323F075

Interim Deficiency Rept Re Erroneous Output Readings Noted in Model 1151A Pressure Transmitters Supplied by Rosemount, Inc.Final Rept Will Be Forwarded by 800731

ML19323F075
Person / Time
Site:	Grand Gulf
Issue date:	05/09/1980
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:
References
AECM-80-98, NUDOCS 8005280495
Download: ML19323F075 (2)

Text

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. 5 ij - {1 S i MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi Enh al P. O . B O X 16 4 0. J A C K S O N, MISSISSIPPI 39205

,,oo6cy,o og,..,.c., May 9, 1980 t

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission

. Region II 101 Marietta Street, N.W., Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos.40-416 and 40-417 File 0272/15525/15526 PRD-80/19, Status Report, Rosemount Model 1151A Pressure Transmitters AECM-80/98 On April 11, 1980, Mississippi Power & Light Company notified Mr. F. Cantrell of your office of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns erroneous output readings noted in Model 1151A pressure transmitters supplied by Rosemount, Inc. This condition was reported to the NF.C pursuant to the requirements of 10CFR21 by Bechtel Power Corporation in their letter dated April 24, 1980.

Rosemount Model 1151A transmitters are specified to have a linear output of 4 to 20 MA throughout the calibrated range. Rosemount has observed, in a limited number of transmitters, that when over-ranged at 140% of the instrument's upper calibrated limit, the output current will fall below 20 MA. Similarly, if the transmitter's under-ranged condition exceeds 100% of the calibrated span, the transmitter output may be greater than 4 MA.

Our preliminary findings indicate that the defective transmitters, if employed in safety applications, would have adverse affects on plant b

Qf % D 8005280N Member Middle South Ut'ilities System

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1. - MISSISSIPPI POWEf t Q LIGHT COMPANY l

Mr. J. P. O'Reilly AECM-80/98 U. S. Nuclear Regulatory Commission Page 2 operation. The application of this component at GGNS and extent of use, j if any, remains under investigation.

We expect to provide our final report and determination of '-

repo'rtability on this matter no later than July 31, 1980. This .

condition is being tracked under PRD-80/19 and Bechtel Management Corrective Action Report (MCAR)-GGNS No. 72.

- Yours truly,

/

L. F ale Nuclear Project Manager

)

JGC/JDR:ls cc: Mr. N. L. Stampley Mr. T. B. Conner l

Mr. R. B. McGehee Mr. Victor Stello, Jr., Director Division of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 bec: Dr. D. C. Gibbs Mr. A. Zaccaria Mr. J. N. Ward Mr. D. M. Lake Mr. W. L. Nail -

Mr. J. P. McGaughy Mr. I. E. Reaves Mr. C. K. McCoy Mr. J. W. Yelverton Mr. A. R. Smith Mr. Tom Houghton M . M. D. Hunt

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