ML19309H130: Difference between revisions

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The trip / calibration unit has a common mode failure of an essential switch that determines the trip output logic. The malfunction open-circuits the logic, thereby providing an inoperable signal.
The trip / calibration unit has a common mode failure of an essential switch that determines the trip output logic. The malfunction open-circuits the logic, thereby providing an inoperable signal.
The transmitter has a common mode failure of a capacitor when the transmitter operating temperature is greater than 17SOF or when the damping potentiometer is rotated clockwise. The failure is manifested as a drop in transmitter output current of up to 10 percent of the correct current.
The transmitter has a common mode failure of a capacitor when the transmitter operating temperature is greater than 17SOF or when the damping potentiometer is rotated clockwise. The failure is manifested as a drop in transmitter output current of up to 10 percent of the correct current.
.
II. Investigation Status Our preliminary investigation indicated that the defect noted in the trip / calibration units was previously reported by MP&L as PRD-79/18.
II. Investigation Status Our preliminary investigation indicated that the defect noted in the trip / calibration units was previously reported by MP&L as PRD-79/18.
Our final report on PRD-79/16 was submitted to the NRC in the letter dated January 30, 1980. That deficiency was determined to be reportable under 10 CFR 50.55(e). Corrective actions associated with PRD-79/18 are documented under Bechtel Management Corrective Action Request (MCAR)
Our final report on PRD-79/16 was submitted to the NRC in the letter dated January 30, 1980. That deficiency was determined to be reportable under 10 CFR 50.55(e). Corrective actions associated with PRD-79/18 are documented under Bechtel Management Corrective Action Request (MCAR)
GGNS No. 56.
GGNS No. 56.
The defect noted in the Model 1152 pressure transmitters was not previously reported by MP&L. The investigation into this defect, the component's use at GGNS, and the associated safety implications, is in progress.
The defect noted in the Model 1152 pressure transmitters was not previously reported by MP&L. The investigation into this defect, the component's use at GGNS, and the associated safety implications, is in progress.
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Latest revision as of 10:58, 1 February 2020

Status Rept on Deficiency Re Rosemount Model 510 Du Trip/ Calibr Units & Model 1152 Pressure Transmitters.Transmitter Has Common Mode Failure of Capacitor When Transmitter Operating Temp Greater than 175F.Review Underway
ML19309H130
Person / Time
Site: Grand Gulf  Entergy icon.png
Issue date: 04/25/1980
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML19309H129 List:
References
NUDOCS 8005080484
Download: ML19309H130 (1)
v • d • e


Text

  • . ..

? . 800 5080yIf ,

O ATTACHMENT TO AECM-80/86 i

l STATUS REPORT ON PRD-80/11 4

I. Description of Deficiency i Defects in two components supplied by Rosemount are identified under PRD-80/11. These components are the Model 510 DU trip /cali-bration unit and the Model 1152 pressure transmitter.

The trip / calibration unit has a common mode failure of an essential switch that determines the trip output logic. The malfunction open-circuits the logic, thereby providing an inoperable signal.

The transmitter has a common mode failure of a capacitor when the transmitter operating temperature is greater than 17SOF or when the damping potentiometer is rotated clockwise. The failure is manifested as a drop in transmitter output current of up to 10 percent of the correct current.

II. Investigation Status Our preliminary investigation indicated that the defect noted in the trip / calibration units was previously reported by MP&L as PRD-79/18.

Our final report on PRD-79/16 was submitted to the NRC in the letter dated January 30, 1980. That deficiency was determined to be reportable under 10 CFR 50.55(e). Corrective actions associated with PRD-79/18 are documented under Bechtel Management Corrective Action Request (MCAR)

GGNS No. 56.

The defect noted in the Model 1152 pressure transmitters was not previously reported by MP&L. The investigation into this defect, the component's use at GGNS, and the associated safety implications, is in progress.

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