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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
P.O. Box 63 Lycoming, New York 13093 Constellation Nuclear Nine Mile Point Nuclear Station February 8, 2002 A Member of the NMP1L 1641 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
Subject:
Special Report, Channel #12 Suppression Chamber Water Level IndicatorInoperable Gentlemen:
In accordance with Action Statement 4.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 #12 Suppression Chamber Water Level indicator.
Description of Event On January 25, 2002 at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> the operating crew declared the Channel #12 Suppression Chamber Water Level indicator inoperable after noting that the water level indicator was erratic and not trending as expected. The operating crew verified that the Channel #11 Suppression Chamber Water Level indicator was operable.
Cause ofEvent The cause of the Channel #12 Suppression Chamber Water Level indicator degraded response is ripple voltage on the output of the AC to DC power supply to the indicator. The power supply, PWRS-(1S12)24VDC, is a Bailey Type 765. The ripple voltage is attributed to the aging of the capacitors associated with the power supply.
I/V
Page 2 NMP1L 1641 A search of work history did not identify any previous failures of power supply PWRS-(iS12)24VDC.
CorrectiveActions
- 1. Power supply, PWRS-(lS12)24VDC, will be repaired by March 28, 2002.
- 2. A Preventive Maintenance activity was established to routinely replace capacitors on power supply PWRS-(lS12)24VDC.
Very truly yours, ce.Montg cry Gene al Manager Nuclear Engineering LAH/KLE/cld cc: Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector Records Management
