L-2025-099, Special Report - Post Accident Monitoring (PAM) Instrumentation
| ML25132A169 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 05/12/2025 |
| From: | Mack K Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2025-099 | |
| Download: ML25132A169 (1) | |
Text
F=PL U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Re:
Florida Power & Light Company Turkey Point Unit 4 Docket No. 50-251 May 12, 2025 Subsequent Renewed Facility License DPR-41 Technical Specification 5.6.4 Special Report Special Report-Post Accident Monitoring (PAM) Instrumentation L-2025-099 10 CFR 50.36 Pursuant to the requirements of Turkey Point Technical Specifications (TS) 3.3.3 and TS 5.6.4, the Attachment to this letter provides a Special Report regarding Post Accident Monitoring Instrumentation.
Should you have any questions regarding this submission, please contact Ms. Maribel Valdez, Fleet Licensing Manager, at 561-904-5164.
Sincerely, Director, Licensing and Regulatory Affairs Florida Power & Light Company cc:
USNRC Regional Administrator, Region II Project Manager, USNRC, Turkey Point Nuclear Plant Resident Inspector, USNRC, Turkey Point Nuclear Plant Mr. Clark Eldredge, Florida Department of Health
Attachment:
Containment High Range Radiation Monitor Inoperable Technical Specification 5.6.4 Special Report Florida Power & Light Company 9760 SW 344th Street, Homestead, FL 33035
ATTACHMENT CONTAINMENT HIGH RANGE RADIATION MONITOR INOPERABLE TECHNICAL SPECIFICATION 5.6.4 SPECIAL REPORT (1 page follow)
Florida Power & Light Company 9760 SW 344th Street, Homest ead, FL 33035
EVENT DESCRIPTION L-2025-099 Attachment Page 1 of 1 On March 31, 2025, containment high range radiation monitor (CHRRM), RAD-4-6331 B, was declared inoperable. Technical Specification 3.3.3 Condition A was entered which states:
One or more Functions with one required channel inoperable Restore required channel to operable status in 30 days.
On April 30, 2025, RAD-4-6331 B was not restored to operable status therefore Condition B was entered which states:
Required Action and associated Completion Time of Condition A not met Initiate action in accordance with Specification 5.6.4 immediately Technical Specification 5.6.4 states:
"When a report is required by Condition B or F of LCO 3.3.3, "Post Accident Monitoring (PAM) Instrumentation," a report shall be submitted within the following 14 days. The report shall outline the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the instrumentation channels of the Function to OPERABLE status."
The CHRRMs provide information about radionuclides that might be present, post-accident. This information supports emergency response decision-making during the initial phases of an accident. Loss of CHRRMs would not be considered a major loss of emergency assessment capability because there are diverse means of indication from core exit thermocouples, containment pressure indicators and portable radiation monitors. There are no automatic functions provided by CHRRMs other than annunciation.
CAUSE OF THE EVENT A source response test response was performed on RAD-4-6331 B during the Unit 4 refueling outage.
The detector response was found to be low, outside of the acceptance criteria band, rendering channel B inoperable.
ACTIONS TAKEN The preplanned alternate methods for monitoring containment radiation levels were implemented in accordance with plant procedure O-ADM-117, "Equipment Important to Emergency Response." The loss of CHRRMs channel B was entered into the Turkey Point corrective action program.
SCHEDULE FOR RESTORING SYSTEM Trouble-shoot and repair plans are ongoing. When the cause of the malfunction is determined, repairs will be made, as necessary, to restore CHRRMs Channel B to operable.