ML19165A027

10CFR21 Reporting of Defects and Non-Compliance - Engine Systems, Inc. Report No. 10CFR21-0125-INT, Rev. 0

ML19165A027
Person / Time
Site:	Cooper
Issue date:	06/05/2019
From:	Woolard S Engine Systems
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML19165A027 (4)

Text

ENGINE SYSTEMS, INC.

175 Freight Road Telephone: 252/977-2720 Rocky Mount, NC 27804 Fax: 252/446-1134 June 5, 2019 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001

Subject:

10CFR21 Reporting of Defects and Non-Compliance -

Engine Systems, Inc. Report No. 10CFR21-0125-INT, Rev. 0 Signal Converter Transmitter P/N SGT/4-20MA/4-20MA/24DC/-LIM-TA[DCM]

Dear Sir:

The enclosed report addresses an on-going evaluation regarding a signal converter transmitter, P/N SCT/4-20MA/4-20MA/24DC/-LIM-TA[DCM].

The evaluation is expected to be completed no later than July 31, 2019.

r Please sign below, acknowledging receipt of this report, and return a copy to the attention of Document Control at the address above (or, fax to number 252/446-1134) within 10 working days after receipt.

Yours very truly, ENGINE SYSTEMS, INC.

Susan Woolard Document Control Coordinator Please let us know if ANY of your mailing information changes - name of recipient, name of company/facility, address, etc. Mark the changes on this acknowledgment form and send to us by mail or FAX to the number above.

RECEIVED:- --------

93 DATE:

Quality Performance With Pride

,

ENGINE SYSTEMS, INC.

175 Freight Road, Rocky Mount. NC 27804 Telephone: 252/977-2720 Fax: 252/446-1134 Report No. 10CFR21-0125-INT Rev. 0: 06/05/19

• INTERIM REPORT 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: Signal Converter Transmitter P/N SCT/4-20MA/4-20MA/24DC/-LIM-TA[DCM]

SYSTEM: Steam Turbine Control CONCLUSION: Not yet completed Prepared By: --,,=-

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Engineering Manager

---

Reviewed By:---~-/~*_,__ _._~--------- Date: 6 /r/11 Quality Assurance Manager Quality Performance With Pride

• Report No. 10CFR21-0125-INT Record of Revisions Page: 1 of 1 REV DATE PAGE DESCRIPTION 0 06/05/19 Initial issue.

J '

Report No. 10CFR21-0125-INT

• ' Revision: 0 Date: 06/05/19 Page: 1 of 1 COMPONENT:

Signal converter transmitter, P/N SCT/4-20MA/4-20MA/240C/-LIM-TA[OCM]

PURPOSE:,

This interim report is issued because Engine Systems, Inc. (ESI) has not been able to complete the evaluation of a failure within the 60-day requirement of 10CFR21.21. The evaluation is expected to be completed no later than July 31, 2019.

SUMMARY

ESI was notified on April 6, 2019 of a fault within the RCIC turbine control system supplied to Cooper Nuclear Station. The turbine control displayed a loss of remote speed input alarm ("Remote Spd Input Failed") indicative of a loss of the 4-20mA input signal. Troubleshooting performed by the site determined the cause was most likely due to the signal converter (also called signal conditioner) or associated power supply. The signal converter is used to sense the customer's remote speed setpoint 4-20 mA input signal and convert the signal to an isolated 4-20 mA output signal which is transmitted to the turbine control. The transmitter includes a limiting function where if the input signal is below 4 mA, the minimum output is limited to 2. 7 mA and if the input signal is above 20 mA, the maximum output is limited to 21.3 mA. The power supply is used to step down system voltage from nominal 120 voe to 24 voe to power the current loop.

ESI has performed testing on both the signal converter and power supply. To date, the power supply has tested satisfactorily with no anomalies or indications of failure. Initial testing of the signal converter found the device to produce an output current approximately proportional to the input; however, when attempts were made to adjust the device it was determined the converter could not be adjusted. Subsequent internal inspection revealed an overheated resistor. The converter is currently at the manufacturer's facility for more detailed analysis.

Since the signal converter transmits the customer's remote speed setpoint input to the turbine control, operability of the device is critical to operation of the RCIC turbine control system. Therefore, a failure of the signal converter would adversely affect the RGIC turbine control system and thus may affect the safe shutdown of the reactor.

ESI is in the process of performing-additional testing and analysis at the manufacturer's facility. ESI is unable to complete an evaluation within the 60-day requirement.

EXTENT OF CONDITION/ INTERIM CONTAINMENT ESI has supplied this component to one customer, Cooper Nuclear Station. Qty 2 signal converters were purchased for this batch, one for the customer and the other was used as a destructive test specimen. Therefore, there are no additional components from this same lot in safety-related applications. ESI will withhold shipment of any signal converters until the evaluation is complete.

ES! Sales C-of-C Mfg Serial End User End User P.O. Qty Order Date Number Cooper Nuclear Station Contract 09-69A 8001553 1 09/28/2015 2379741 (supplied through Dresser-Rand) 200441 (D-R)

Note: The signal converter was installed in a control panel assembly P/N 8001553-01 (qty 1 per panel).