ML20010H511

First Interim Deficiency Rept on Incorrect Reactor Water Level Measuring Devices,Initially Reported 810823.Cause & Extent of Deficiency Not Yet Determined.Final Rept Expected by 811130

ML20010H511
Person / Time
Site:	Grand Gulf
Issue date:	09/18/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-81-361, NUDOCS 8109240557
Download: ML20010H511 (4)

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O O MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi EdhMhMMdB P. O . B O X 164 0. J AC K S O N, MIS SIS SIP PI 3 9 2 0 5 ll ,1: . 3 ,

1. 8dE[57A"s" lid" September 18, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region 11 101 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 Dockat Nos. 50-416/417 File 0260/15525/15526 PRD-81/34, Interim Report #1, Incorrect Reactor Water Level Measuring Devices AECM-81/361 On August 23, 1981, Mississippi Power & Light Company notified Mr. P. A.

Taylor, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns incorrect reactor vessel water level tram:r.itters anj trip units.

Our evaluation of the deficiency and determination of reportability have not been completed. We expect to submit a final report by November 30, 1981.

Yours truly

. McGaughy, Jr.

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Member Middle South Utilities Systerr,

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e Mr. J. P. O'Reilly AECM-81/361 NRC lage 2' cc: Mr. N. L. Staapley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor.Stello, Jirector Office of Inspection & Enforcement U. S. Nuclear Regulat.ory Cornaission Washin.:*an, D.C. 20555 Mr. G. B. Taylor l South Mins. Electric Power Association P. O. Box 1589.

Hattiesbarg, MS 39401

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bec: Dr. D. C. Gibbs Mr. J. Leatherman Mr. J. N. Ward Manager of BWR-6 Licensing Mr. J. P. McGaughy, Jr. General Electric Company Mr. 1. D. Heaton 173 Curtner Avisene Mr. R. Trickovic San Jose, Ca. 95125 Mr. J. W. Yelverton Mr. L. F. Dale Mr. C. K. McCoy Mr. D. M. Houston Mr. T. H. Cloninger U. S. Nuclear Regulatory Commission Mr. R. A. Ambrosino Division of Licen"..tg Mr. A. J. Iosue Washington, D. C 20555 Mr. G. B. Rogers Mr. S. H. Hobbs

• Mr. L. E. Ruhland Mr. J. Matore Mr. D. L. Hunt U. S. Nuclear Regulatory Commission Mr. A. G. Wagner Division of Licensing Mr. P. A. Taylor Washington, D. C. 20555 PRD File File e

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v Attrchment to AECM-81/361 Pegn 1 of 1 INTERIM REPORT #1 TO PRD-81/34 I. Description of the Deficiency Incorrect reactor vessel water level transmitters and trip unJ.ts have been provided to Grand Gulf Nuclear Station by our NSSS supplier. dide range transmitters were installed instead of narrow range transmitters as i are required for the design. Several master trip units are also the wrong instruments.

We are cur ~ently investigating, along with our NSSS supplier, to deter-mine plant systems af fected and safety implications.

II. Approach to Resolution of the Prob 1.em The cause and extent of the deficiency have not been d2termined. To correct the existing deficieacy all incorrect transmitters and trip units will be replaced.

III. Status of Proposed Resolution Our investigation is still in progress to determine safety implications, cause and extent, and actions to preclude recurrence. The deficiency does appear to be limited to the NSSS scope of supply.

IV. Reason Why a Final Report Will be Delayed We have not completed our investigation and evaluation of the deficiency.

V. Date When Final Report Will Be Submitted We expect to submit a Final Report by November 30, 1981.

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