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Category:Licensee 30-Day Written Event Report
MONTHYEARML16319A0982016-11-0808 November 2016
Special Report: Inoperable Drywell Pressure Monitor/Suppression Chamber Water Level Instrumentation
ML15174A1282015-06-19019 June 2015
Special Report: Containment High Range Radiation Monitor Instrumentation Channel #12 Inoperable
NMP1L2980, 10 CFR 50.46 30-Day Report2014-12-12012 December 2014
10 CFR 50.46 30-Day Report
ML12268A0492012-09-12012 September 2012
Discovery of Tritium in Groundwater In-Leakage - 30-Day Report in Accordance with the Industry Ground Water Protection Initiative
ML11165A2212011-06-0606 June 2011
Day Report Pursuant to 10 CFR 50.46, Acceptance Criteria for Emergency Core Cooling Systems for Light-Water Nuclear Power Reactors
ML1109701512011-04-0101 April 2011
Interim Report on Thermostatic Valve Failure on Palo Verde EDG
ML0919505792009-07-0808 July 2009
Special Report: Containment High Range Radiation Monitor Instrumentation Channel 11 Inoperable
ML0913904002009-05-11011 May 2009
Submittal of Containment High Range Radiation Monitor Instrumentation Channel 11 Inoperable
ML0802305112008-01-11011 January 2008
Special Report: Inoperable Suppression Chamber Water Level Instrument
ML0701704682007-01-11011 January 2007
Report of Changes or Errors Discovered in the Current Acceptable Emergency Core Cooling System Evaluation Models
ML0618703962006-06-19019 June 2006
Special Report; Channel #11 of the Containment Hydrogen Monitoring System Inoperable for Unplanned Maintenance
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
ML18094A0311977-09-0707 September 1977
Telecopy Message from Niagara Mohawk Power Corp Re Event on 9/7/1977 Re August 1977 Liquid Waste Monthly Chemical Composite Analysis
ML17037C1301972-08-0101 August 1972
Letter Reporting an Orderly Shutdown on July 27, 1972 Due to Increasing Recirculation System Valve Packing Leakage within the Drywell
ML17037C1011972-04-19019 April 1972
Letter Reporting Findings on Incident That Occurred on 12/31/1971 in Which Unit 1 Tripped Off Line as Result of Surveillance Testing
ML17037C1021972-04-18018 April 1972
Letter Reporting an Incident Tripped Off-Line as a Result of a Malfunction in a Continuous Power Supply on 02/28/72
ML17037C1371971-09-25025 September 1971
Letter Regarding a Maintenance Item Occurring During the Outage of Unit 1 in April-May 1971
ML17037C1421970-03-10010 March 1970
Letter Reporting an Incident, During Radiography and Ultrasonic Testing, That Disclosed a Series of Cracks Extending Around the Upper 180 Degrees of the Inside Diameter, Exist in the Stainless Steel Safe-End of the Core Spray..
ML17037C1431970-03-0606 March 1970
Letter Notifying the Commission of a Situation in Which Waste Discharge in Excess of Technical Specifications Has Taken Place on February 26, 1970
ML17037C1441969-12-0606 December 1969
Letter Reporting That the Nine Mile Point Reactor Was Scrammed from 25 Percent Power on November 20, 1969 and Advising That the Reactor Will Be Brought Critical and the Turbo-Generator Set Placed on the Line on December 8, 1969
ML17037C1451969-11-18018 November 1969
Letter Reporting an Incident on November 8, 1969 Where the Reactor Scrammed on Momentary Upscale Trips from Intermediate Range Monitoring Channels
2016-11-08
[Table view]
Category:Written Event Report (30 or 60 day)
MONTHYEARNMP1L3380, Special Report: Containment High Range Radiation Monitor Instrumentation Channel 11 Inoperable2021-03-17017 March 2021
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
[Table view] |
Text
RO. Box 63 Lycoming, New York 13093 Constellation Nuclear Nine Mile Point Nuclear Station February 25, 2002 NMP1L 1645 A Member of the Constellation Energy Group U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63 Subiect: Special Report, Channel #11 ContainmentHigh Range Radiation Monitor Inoperable Gentlemen:
In accordance with Action Statement 3.a of Nine Mile Point Unit 1 Technical Specification Table 3.6.11-2, "Accident Monitoring Instrumentation Action Statements,"
Nine Mile Point Nuclear Station, LLC is submitting the following Special Report concerning the inoperability of Channel #11 Containment High Range Radiation Monitor.
Descriptionof Event On February 10, 2002, at approximately 0740 hours0.00856 days <br />0.206 hours <br />0.00122 weeks <br />2.8157e-4 months <br />, operators declared the Channel #11 Containment High Range Radiation Monitor inoperable when indication failed downscale. Troubleshooting of the high voltage and signal cables did not identify any open circuits. A nick that exposed the coaxial shield of the signal cable was identified.
This is the most probable cause of the failure.
The signal cable was repaired and high voltage and signal connectors on the detector and cables were cleaned. Troubleshooting of the radiation monitor in the Control Room and a complete calibration of the system revealed no failures. Detector operation was observed on February 19, 2002, with no abnormalities identified. On February 20, 2002, the Channel #11 Containment High Range Radiation Monitor was declared operable.
The redundant Channel #12 Containment High Range Radiation Monitor was in service while the Channel #11 Containment High Range Radiation Monitor was out of service.
Page 2 NMP1L 1645 Cause ofEvent The most probable cause of the Channel #11 Containment High Range Radiation Monitor downscale reading was a nick that exposed the coaxial shield of the signal cable.
CorrectiveActions
- 1. The nick that exposed the coaxial shield of the Channel #11 Containment High Range Radiation Monitor signal cable was repaired.
- 2. The high voltage and signal connectors on the detector and cable were cleaned.
Very truly yours, Lawrence A. Hopkins Unit 1 Plant General Manager LAH/KLE/cld xc: Mr. H. J. Miller, Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector Records Management
