ML19339A346

Part 21 Rept Re Deficient Switch on Rosemount Model 510 Du Trip/Calibr Units & Model 1152 Pressure Transmitters, Reported on 800327.Field Disposition Instructions Issued to Return Units for Repair

ML19339A346
Person / Time
Site:	Grand Gulf
Issue date:	10/22/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-80-205-009 10CFR-050.55E, 10CFR-50.55E, AECM-80-264, NUDOCS 8011030620
Download: ML19339A346 (4)

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. PART 21 IDBRIFICATION NO. T56-T.06-oo8i C(FPAW NA"E.4 Lide ca.

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. IhlE OF LElWA idhu.l*o IDa(ET NO. Ec-%ht1 i DATE DISTRIBlIED to tA to p.m - ORIGIIML REPORT _

StPPLBENTARY 1 DISTRIBlHION:

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ACTION:

PRELIMINARY EVALUATION OF B E' ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FO FOLLOWJP AS SFDWN BELOW:

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P. O. B O X 16 40. J A CK S O N. MIS SIS SIP PI 3 9 2 05 YE Yw Yc"M October 22, 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'R'eilly, Director

SUBJECT:

Corand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/41741 File 0260/15525/15526 PRD-80/ll, Final Report, E.se-mount Model 510 DU Trip /Ca_i-bration Units and Model 1152 Pressure Transmitters AECM-80/264

References:

1) AECM-80/31, 1/30/80

2) AECM-80/86, 4/25/80

3) AECM-80/141, 4/24/80

4) AECM-80/147, 7/2/80 on March 27, 1980, Mississippi Power & Light Co=pany notified Mr. F. Cantrell of your office of two Potentially Reportable Defi-ciencies (PRDs) at the Grand Gulf Nuclear Station (GGNS) construc- ,,

tion site. 'These deficiencies concern Rosemount Model 510 DU trip /

calibration units and Model 1152 pressure transmitters.

The deficiency regarding the Model 510 DU Trip Unit was pre-viously reported to you by MP&L as PRD-79/18. Our final report on PRD-79/18 was submitted to your office by the MP&L letter dated January 30, 1980. Our final report on these trip units under  !

PRD-80/11 was submitted by the MP&L letter dated June 24, 1980. I We later submitted additional information required by 10CFR21 on this deficiency in our letter dated July 2, 1980. .

Our investigation revealed that the deficiency pertaining '

to the 1152 Pressure Transmitter is reportable within the meaning of 10CFR50.55(e). Our Final Report of this =atter is attached. I l

We are continuing our investigation of this deficiency to deter-cine reportability under 10CFR21. _

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. Member Middle South Utilities System

MIIslbS!PPI POWER & LIGHT COMPANY * .

Mr. J. P. O'Reilly AECM-80/264.

NRC , -

~; Page: 2 : -  ;

~ Yours truly, y- J. P. McGaufhy, Jr.

WDH:mt Attachment '-" -- ~ '

cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner ~" ' ' - ~ ~ ~' ' '

. . : .' . ~~ .- -

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Mr. Victor Stello, Director ~

Division of Inspection & Enforcement '

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U. S. Nuclear Regulator,/ Commissio'n .

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Washington, D.C. 20555 bec: . Dr. D. C. Gibbs-Pa. J. P. McGaughy Mr. J. N. Ward '

Mr. A. Zaccari'a' ~

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Mr. J. W. Yelverton  ;

Pz. L. F. Dale -

Mr.. C. K. McCoy: -

Mr. T. H. Cloniriger

Mr.' R. A. Ambros'ino.'. _ } ' . . ' '.

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- Mr '. C. L. Tyrone ;.''~,~~.,

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- Mr.- P. K. VanDoorn '

Mr. A. G. Wagner _

PRD File ,-

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FINAL REPORT TO PRD-80/11 (Model 510 DU Trip Unit)

I. Description of Deficiency The Rosemount Model 510 DU' Trip / Calibration Unit has a common mode failure of an essential switch that determines the trip output logic. The dalfunction: reverses the logic, thereby .

providing an . erroneous signal. , The trip unit is used in con-junction with the pressure transmitter to provide high or low-trip signals.

II. Safety Implications Due to the inherent safety functions of these devices, failure would adversely affect the safety of operation of Grand Gulf Nucleat Station, Units 1 and 2. As an example, when the Model 510 DU is used as a water level trip unit, the deficiency can result in indicating high reactor water level when actually the' water level is low.

III. Corrective Action Taken General Electric has issued Field Disposition Instructions (FDI's) to return Model 510 DU Trip Units to manufacturer for repair.

Details of the corrective act. ion are delineated in the following FDI's:

Unit 1 Unit 2 Trip Units FDI-WAMD FDI-WBIX

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