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Category:Written Event Report (30 or 60 day)
MONTHYEARULNRC-06850, Special Report 2023-03 Pam Report Inoperability of a Post Accident Monitoring (Pam) Instrument2023-12-21021 December 2023
Special Report 2023-03 Pam Report Inoperability of a Post Accident Monitoring (Pam) Instrument
ML23080A2932023-03-21021 March 2023
Enclosure - Special Report 23-02
ML22300A0822022-10-27027 October 2022
Special Report 2022-03, Non-Functionality of Loose-Part Detection System Channel for Greater than 30 Days
ULNRC-06745, Special Report 2022-01: Inoperability of a Seismic Instrument for Greater than 30 Days2022-05-10010 May 2022
Special Report 2022-01: Inoperability of a Seismic Instrument for Greater than 30 Days
ULNRC-06724, 30-Day Report for Unsatisfactory Performance by an HHS Laboratory for Ameren Missouri Callaway Plant2022-03-16016 March 2022
30-Day Report for Unsatisfactory Performance by an HHS Laboratory for Ameren Missouri Callaway Plant
ULNRC-06708, Special Report 2022-01, Non-Functionality of Loose Parts Monitoring Channel for Greater than 30 Days2022-01-11011 January 2022
Special Report 2022-01, Non-Functionality of Loose Parts Monitoring Channel for Greater than 30 Days
ULNRC-06668, Special Report 2021-01 - Callaway Plant, Unit 1, Non-Functional Seismic Instrument for Greater than 30 Days2021-07-0808 July 2021
Special Report 2021-01 - Callaway Plant, Unit 1, Non-Functional Seismic Instrument for Greater than 30 Days
ULNRC-06618, Special Report 2020-012020-11-12012 November 2020
Special Report 2020-01
ULNRC-06542, SR-2019-003 for Callaway Plant, Unit 1, Inoperability of Loose Parts Detection System Channel 3 for Greater than 30 Days2019-11-18018 November 2019
SR-2019-003 for Callaway Plant, Unit 1, Inoperability of Loose Parts Detection System Channel 3 for Greater than 30 Days
ULNRC-05187, Inoperable Channel 3 of the Loose Parts Detection System (Lpds)2005-08-11011 August 2005
Inoperable Channel 3 of the Loose Parts Detection System (Lpds)
ML0516702022005-06-0909 June 2005
Special Report Meteorological Tower 10-60M Air Temperature Delta-T Inoperable
ULNRC-05089, Special Report on the Inoperability of Unit Vent High Range Radiation Monitor2004-11-10010 November 2004
Special Report on the Inoperability of Unit Vent High Range Radiation Monitor
ML0426104292004-09-0303 September 2004
Special Report: Meteorological Tower 10M - 60M T Indication Inoperable
ML0421702912004-07-28028 July 2004
Special Report, Meteorological Tower 10M - 60M at Wind Direction Indication Inoperable
ML0407105792004-03-0404 March 2004
Special Report Regarding Inoperable Channel 12 of the Loose Parts Detection System (Lpds)
ULNRC-04834, Facility Operating License NPF-30 10 CFR 50.46 Thirty Day Report ECCS Evaluation Model Revisons2003-04-0808 April 2003
Facility Operating License NPF-30 10 CFR 50.46 Thirty Day Report ECCS Evaluation Model Revisons
ML0208506032002-03-15015 March 2002
Special Report 2002-01 GT-RT-21B Radiation Monitor Inoperable
2023-03-21
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Enclosure to ULNRC-06805 Page 1 of 1 Special Report 23-02 Requirement Callaway Plants Final Safety Analysis Report (FSAR) Section 16.3.3.4 contains functionality requirements for accident monitoring instrumentation. The Limiting Condition for Operation (LCO) corresponding to this FSAR section requires the accident monitoring instrumentation channels shown in Table 16.3-7 to be functional in MODES 1, 2, and 3. Specifically, with a required channel non-functional for more than 30 days, Action A applies, which states:
"With the number of FUNCTIONAL accident monitoring instrumentation channels less than the Total Number of Channels shown in Table 16.3-7, restore the nonfunctional channel(s) to FUNCTIONAL status within 30 days or prepare and submit a Special Report to the Commission within the following 14 days outlining the preplanned alternate method of monitoring, the cause of the non-functionality, and the plans and schedule for restoring the channels to FUNCTIONAL status."
Preplanned Alternate Method of Monitoring Callaway Plant is equipped with two redundant trains of containment hydrogen analyzers. The train A analyzer, GS065A, was declared non-functional on February 10, 2023. The train B analyzer, GS065B, remains functional. Having the one remaining containment hydrogen analyzer functional is within the minimum channels FUNCTIONAL requirements of Table 16.3-7 such that it remains capable of being used to analyze containment hydrogen.
Cause of the Non-functionality While performing calibration checks for the containment hydrogen analyzer Train A loop, it was noted that the Heat Tracing Energized light remained locked on, indicating insufficient power to reach the maximum temperature setpoint of the heat tracing for the hydrogen analyzer. Heat tracing is required to remove moisture from the analyzer's sample line in order to provide an accurate sample result.
Subsequent troubleshooting found that the transformer that powers the hear tracing was not providing sufficient voltage output to adequately power the heat tracing.
Plans and Schedule for Restoring the Channels to FUNCTIONAL Status Restoration of the train A analyzer to FUNCTIONAL Status will require the transformer to be replaced.
Discussions with the vendor indicate a replacement transformer is expected to be available by June 30, 2023.
