NMP1L3380, Special Report: Containment High Range Radiation Monitor Instrumentation Channel 11 Inoperable
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| ML21078A102 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/17/2021 |
| From: | Schuerman A Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L3380 | |
| Download: ML21078A102 (2) | |
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|---|---|
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[Table view]Special Report: Containment High Range Radiation Monitor Instrumentation Channel 11 Inoperable ML0526401672005-09-12012 September 2005 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable ML0525004162005-08-29029 August 2005 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable ML0522402502005-08-0303 August 2005 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable ML0506901722005-03-0101 March 2005 Special Report, Channel No. 11 of the Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance ML0502501452005-01-17017 January 2005 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance ML0420403002004-07-12012 July 2004 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable for Nine Mile Point Unit 1 ML0407607562004-03-0505 March 2004 Special Report, Channel #11 Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance ML0406409232004-02-20020 February 2004 Special Report, Channel #12 Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance ML0236101942002-12-13013 December 2002 Special Report, Channel #12 Accident Monitoring Instrumentation Inoperable Due to Loss of Power ML0233304002002-10-31031 October 2002 Special Report, Channel #11 Containment High Range Radiation Monitor Declared Inoperable to Repair Failed Chart Recorder ML0207905522002-03-0404 March 2002 Special Report Re Channel 12 Chamber Water Level Indicator Inoperable ML0208404412002-02-25025 February 2002 Special Report, Channel #11 Containment High Range Radiation Monitor Inoperable ML0206502942002-02-20020 February 2002 Special Report Re Channel #12 Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance ML0205801952002-02-0808 February 2002 Special Report, Channel #12 Suppression Chamber Water Level Indicator Inoperable ML0205002372002-01-21021 January 2002 Special Report Re Channel 11 Containment Hydrogen Monitoring System Inoperable for Scheduled Elective Maintenance 2021-03-17 |
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~;./ Exelon Generation Technical Specifications NMP1L3380 March 17, 2021 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 Docket No. 50-220
Subject:
Special Report: Containment High Range Radiation Monitor.Instrumentation Channel #11 Inoperable In accordance with Action 3 of Nine Mile Point Unit 1 (NMP1) Technical Specification (TS)
Table 3.6.11-2, "Accident Monitoring Instrumentation Action Statements," Nine Mile Point Nuclear Station, LLC (NMPNS) is submitting the following Special Report concerning inoperability of Containment High Range Radiation Monitor Instrumentation Channel #11.
Description of Event On March 12, 2021 at 0850, the Channel #11 Containment High Range Radiation Monitor was declared inoperable for performance of planned preventive maintenance to replace aged components within the Readout Module in accordance with station workorder C93697385.
The redundant channel of Containment High Range Radiation Monitor Instrumentation, Channel #12, was operable during the period Channel #11 was inoperable.
Cause of lnoperability The cause of the inoperability was to perform planned preventive maintenance.
Action Taken Instrument maintenance technicians completed the planned preventive maintenance and the Containment High Range Radiation Monitor Instrumentation Channel #11 was restored to operable on March 12, 2021 at 1403.
NMP1 Special Report March 17, 2021 Page 2 Should you have any questions regarding the information in this submittal, please contact Brandon Shultz, Mgr. Site Regulatory Assurance, at (315) 349-7012.
Sincerely,
{; Digitally signed by Schuerman, Schuerman, I\AdamG
/)'.lN:ccn=Schuerman, Adam G AdamG t.>/ . Dat;: 2021.03.15 06:51 :08 -04'00' Adam G. Schuerman Pl~nt Manager, Nine Mile Point Nuclear Station Exelon Generation Company, LLC AGS/BKS cc: NRC Regional Administrator, Region I NRC Senior Resident Inspector NRC Project Manager