W3F1-2024-0024, Special Report SR 2023-004-02 Radiation Monitor Inoperable Greater than 7 Days

Special Report SR 2023-004-02 Radiation Monitor Inoperable Greater than 7 Days

ML24169A371
Person / Time
Site:	Waterford
Issue date:	06/17/2024
From:	Twarog J Entergy Operations
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
W3F1-2024-0024 SR 2023-004-02
Download: ML24169A371 (1)

Text

John Twarog Manager Regulatory Assurance 504-739-6747

W3F1-2024- 0024 10 CFR 50. 4

June 17 , 2024

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555- 0001

Subject:

Special Report SR 2023-004-02 Radiation Monitor Inoperable Greater Than 7 Da ys

Waterford Steam Electric Station, Unit 3 NRC Docket No. 50 -382 Renewed Facility Operating License No. NPF -38

Entergy Operations, Inc. (Entergy) is submitting a second supplement to Special Report SR-2023- 004-0 0, for Waterford Steam Electric Station, Unit 3 (Waterford 3). This supplement includes Plant Stack Wide Range Gas Monitor radiation monitor return to operable status.

Special Report SR-2023-004-00 was subm itted on September 25, 2023 and later supplemented on February 28, 20 2 4. Special Report, SR-2023-004-00 was subm itted as required by Waterford 3 Technical Specification (TS) 3.3.3.1, "Radiation Monitoring Instrumentation," which requires the minimum number of Effluent Accident Monitor channels shown in TS Table 3.3- 6 to be operable. If the monitor is not restored to operable status within 7 days after the failure, a Special Report is required to be submitted in accordance with TS 6.9.2 within 14 days after the failure outlining the actions taken, the cause of the inoperability and the plans and schedule for restoring th e syste m to OPERABLE sta tu s.

This letter contains no new com m itments.

Should you have any questions concerning this issue, please contact me at 504 -739 -6747 .

Respectfully,

Digitally signed by John R. Twarog John R. DN: cn=John R. Twarog, c=US, o=Entergy, ou=Waterford 3 Regulatory Assurance, Twarog email=jtwarog@entergy.com Date: 2024.06.17 12:23:56 -05'00'

John Twarog

JRT / mrp

Entergy Operations, Inc., 1726 5 River Road, Killona, LA 70057 W3F1-2024-00 24 Page 2 of 2

Enclosure:

Waterford 3 Special R eport SR-2023-004-02

cc: NRC Region IV Regional Administrator NRC Senior Resident Inspector - Waterford Steam Electric Station, Unit 3 NRC Project Manager - Waterford Steam Electric Station, Unit 3 Louisiana Department of Environmental Quality

Enclosure

W 3 F1-2024- 0024

Waterford 3 Special Report SR-2023-004-02 W3F1-2024- 0024 Enclosure Page 1 of 1

Waterford 3 Special Report SR-2023- 004-02

DESCRIPTION

The Waterford Steam Electric Station, Unit 3 (Waterford 3) Plant Stack ( PS) Wide Range Gas Monitor (WRGM) (PRMIR0110) radiation monitor wa s declared inoperable on September 11, 2023 . Operability was not restored within the required 7- day period as specified in Waterford 3 Technical Specification (TS) 3.3.3.1, "Radiation Monitoring Instrumentation," Table 3.3-6 . T his Special Report is submitted to the Nuclear Regulatory Commission (NRC) in accordance with TS 6.9.2, "Special Reports," and 10 CFR 50 .4, "Written communications," within the next 14 days outlining the actions taken, the cause of the inoperability and the plans and schedule for restoring the system to operable status.

The Plant Stack WRGM monitors air released from the plant st a ck and measures th e radiation released to the environment, if any, during both normal and accident conditions.

ACTIONS TAKEN

On September 11, 2023, during the planned maintenance of PRMIR0110, Plant Stack WRGM process flow probe and corresponding signal conditioning circuit board (SCCB) were found low out of tolerance. The SCCB was adjusted in tolerance and Instrument and Controls (I&C) personnel continued with planned maintenance activities.

On September 14, 2023, I&C technicians attempted to perform flow calibrations and discovered that the mid /high flow loop could not be calibrated.

Maintenance and Engineering conducted initial troubleshooting and discovered a faulty flow measurement probe. Actions were taken to procure a replacement SCCB and corresponding probe. After installing a replacement SCCB and probe, PRMIR0110 remained out of calibratio n. A second replacement SC CB and probe was procured and installed. The replacement process probe/board required additional testing scope.

Once the process flow loop calibration was satisfactorily completed, P RMI R0 1 10 failed to meet the required tolerances during the sample flow loop calibration on the mid/high range sample flow path. Troubleshooting revealed an unseated aux flow control va lve, which is in parallel to the mid/high sample flow path. This configuration induced extra flow through the sample line, resulting in as -found readings out of tolerance. The valve was replaced and PRMIR0110 was successfully calibrated on May 1 5, 2024.

CAUSE OF INOPERABILITY

The cause of the PRMIR0110 inoperability wa s determined to be a degraded aux flow control valve.

PLANS AND SCHEDULE FOR RESTORING OPERABLE STATUS

PRMIR0110 was declared operable on May 17, 2024.