W3F1-2023-0036, Special Report SR-2023-003-01 for Waterford Steam Electric Station, Unit 3, Radiation Monitor Inoperable Greater than 7 Days

Special Report SR-2023-003-01 for Waterford Steam Electric Station, Unit 3, Radiation Monitor Inoperable Greater than 7 Days

ML23124A196
Person / Time
Site:	Waterford
Issue date:	05/04/2023
From:	Milster L Entergy Operations
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
W3F1-2023-0036 SR-2023-003-01
Download: ML23124A196 (1)

Text

S) ente rgy Leia Milster Manager Regulatory Assurance 504-739-6250 W3F1 -2023-0036 10 CFR 50.4 May 4, 2023 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Special Report SR-2023-003-01 Radiation Monitor Inoperable Greater Than 7 Days 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 supplement to Special Report SR-2023-003-00 for Waterford Steam Electric Station, Unit 3 (Waterford 3). Special Report 2023-003-00 was previously submitted on March 17, 2023 (ADAMS Accession No. ML23076A075} 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 an inoperable 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 the system to OPERABLE status.

In Special Report 2023-003-00, the cause of the failure and schedule of repair could not be determined by the required submittal date. This supplement submits the cause determination and restoration of operable status.

This letter contains no new commitments.

Should you have any questions concerning this issue, please contact Leia Milster, Manager, Regulatory Assurance, at 504-739-6250.

R~~

Leia Milster LM/mrp Entergy Operations, Inc., 17265 River Road, Killona, LA 70057

W3F1 -2023-0036 Page 2 of 2 *

Enclosure:

Waterford 3 Special Report SR-2023-003-01

Reference:

Entergy Operations, Inc. (Entergy) letter to NRC, 'Waterford, Unit 3, Submittal of Special Report SR-2023-003-00 Radiation Monitor Inoperable Greater Than 7 Days,"

(ADAMS Accession No. ML23076A075), dated March 17, 2023 cc: NRC Region IV Regional Administrator NRC Senior Resident Inspec tor- Waterford Steam Electric Station, Unit 3

NRC Project Manager - Waterford Steam Electric Station, Unit 3 Louisiana Department of Environmental Quality

Enclosur e W3F1-2023-0036 Special Report SR-2023-003-01

W3F1-2023-0036 Enclosure Page 1 of 2 SPECIAL REPORT SR-2023-003-01 Radiation Monitor Inoperable Greater Than 7 Days DESCR IPTION The Waterford Steam Electric Station, Unit 3 (Waterford 3) Condenser Vacuum Pump Discharge Wide Range Gas Monitor (WRGM) (PRMIR0002) radiation monitor was declared inoperable on March 4, 2023. Operability was not restored within the required 7-day period as specified in Waterford 3 Technical Specification (TS) 3.3.3.1, "Radiation Monitori ng Instrumentation," Table 3.3-6. This Special Report is submitted to the Nuclear Regulat ory 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 Condenser Vacuum Pump WRGM monitors condenser vacuum pump discharg e

continuously to detect steam generator tube leakage and to quantify release rate.

The operability of the subject WRGM channels ensures that: (1) the radiation levels are continually measured in the areas served by the individual channels; (2) the alarm or automatic action is initiated when the radiation level trip setpoint is exceeded; and (3) sufficient information is available on selected plant parameters to monitor and assess these variables following an accident. The radioactive gaseous effluent WRGM instrume ntation is provided to monitor and control, as applicable, the releases of radioactive material s in gaseous effluents during actual or potential releases of gaseous effluents. The alarm/tr ip setpoints for these instruments are calculated and adjusted in accordance with the methodology and parameters in the Offsite Dose Calculation Manual (ODCM) to ensure that the alarm (and/or trip, if applicable) will occur prior to exceeding the limits of Title 10 of the Code of Federal Regulations (10 CFR) Part 20.

ACTIONS TAKEN On March 4, 2022, the Condenser WRGM was found indicating "operate failure" with no pulses received on RM-11, Radiation Monitor System Central Computer. The monitor was declared inoperable, the required actions were taken in accordance with TS 3.3.3.1, Table 3.3-6, and an entry in the Equipment Out of Service log was initiated to track the condition.

The Chemistry Department established the pre-planned alternate method of monitori ng as required.

Actions were taken to procure a replacement detector and a high voltage power supply for the low range channel. Maintenance could not analyze the low range detector circuitry because the site does not possess an approved calibration source for this detector type.

The site requires a certificate of conformance for use of the replacement calibrati on source with this detector type which must be obtained from the vendor. The detector and the source were shipped to the vendor for pairing and certificate of calibration count rate.

W3F1-2023-0036 Enclosure Page 2 of 2 CAUSE OF INOPERABILITY The Condenser Vacuum Pump Discharge Wide Range Gas Monitor inoperability occurred due to a failed high voltage power supply.

PLANS AND SCHEDULE FOR RESTORING OPERABLE STATUS The Condenser Vacuum Pump Discharge Wide Range Gas Monitor was repaired and declared operable on April 6, 2023.