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

{{Adams
| number = ML24169A371
| issue date = 06/17/2024
| title = Special Report SR 2023-004-02 Radiation Monitor Inoperable Greater than 7 Days
| author name = Twarog J
| author affiliation = Entergy Operations, Inc
| addressee name = 
| addressee affiliation = NRC/NRR, NRC/Document Control Desk
| docket = 05000382
| license number = NPF-038
| contact person = 
| case reference number = W3F1-2024-0024
| document report number = SR 2023-004-02
| document type = Letter type:W, Report, Miscellaneous
| page count = 1
}}

=Text=
{{#Wiki_filter: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.}}