ML19330C024

Interim Deficiency Rept Re Erroneous Output Readings Noted in Model 1151A Pressure Transmitters Supplied by Rosemount, Inc.Transmitters Will Be Replaced.Final Rept Will Be Submitted by 801030

ML19330C024
Person / Time
Site:	Grand Gulf
Issue date:	07/31/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML19330C025	List: ML19330C024 ML19330C029 ML19330C034
References
AECM-80-175, NUDOCS 8008070433
Download: ML19330C024 (3)

Text

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MISSISSIPPI POWER & LIGHT COMPANY Eb '

Helping Build Mississippi P. O . B O X 18 4 0. J A C K S O N, MISSISSIPPI 39205 Nuctun PacoucTloN CEPARTMENT July 31, 1980 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. 50-416/417 ~

File 0260/15525/15526 _]

PRD-80/19, Interim 'leport , l J

Rosemount Model ll51A Pressure Transmitters AECM-80/.' 75

Reference:

AECM-80/98, 5/9/80 On April 11, 1980, Mississippi Power & Light Company noti-fled Mr. F. Cantrell of your office of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) con-struction site. The deficiency concerns erroneous output readings noted in Model 1151A pressure transmitters supplied by Rosemount, Inc. This condition was reported to the NRC pursuant to the re-quirements of 10CFR21 by Bechtel Power Corporation in their letters dated April 24, 1980 and July 22, 1980.

We have deter =ined this conditica to be reportable under both 10CFR50.55(e) and 10CFR21. Details are described in the attached interim report. Bechtel's letters (attached) provide the informatien required by 10CFR21.

Our NSSS supplier is currently investigating the application of these transmitters in the NSSS syste=. Upon ccmpletion of their investigation and subsequent evaluation of safety implications we will sub=ic a final report.

Ne expect to ::mplete the evaluation and submit the report by October 30, 1930.

6/9 5/ /

8008070T33 *

,.iemter .'Aiddi? Sou:n U:ilities System

MI2Cl32iPPI POWER Q LIGHT COMPANY Mr. J. P. O'Reilly AECM-80/175 NRC Page 2 1

Yours truly,

! [

/ J. P. McGaughy, Jr.

Assistant Vice President, Nuclear Production ATR:st Attachment 3

cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. 3. Conner Mr. Victor Stello, Director Division of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 a

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. Attachmi.nt to AECM-80/175 Page 1 of 1 INTERIM REPORT FOR PRD-80/19 i I. Description of Deficiency 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 cali-brated Itnit, the output current will fall below 20 MA. Simi-larly, if the transmitter's under-ranged condition exceeds 100% of the. calibrated span, the transmitter output may be greater than 4 MA.

This deficiency is applicable to both Cnits 1 and 2.

II. Safety Implications-Evaluation of these transmitters in a safety related system, such as Combustible Gas Control, shows that the deficiency in a transmitter would adversely affect the operation of the system and provide erroneous information which may cause an operator to take i= proper action.

1 III. Corrective Action The corrective' action will consist of replacing these trans-mitters with new transmitters which do not have this same ambiguous characteristic in the over-range and under-range condition, and which are qualified in accordance with IEEE 2

323-1974 and IEEE 344-1975. Further details are included in Bechtel Management Corrective Action Report (MCAR) GGNS-72.

Corrective actions, if necessary, applicable to the NSSS scope of supply will be provided in our final report.

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