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On February 12, 2018, during performance of a TSC Diesel Generator Functional Test, the TSC Ventilation could not be placed in Filter Mode. Filter Mode operation is credited in the TSC habitability analysis of record. The TSC was declared non-functional due to the unavailability of the filtration system. The Emergency Operations Facility (EOF) is available for use as a backup TSC. Additionally, the TSC would be available for emergency response purposes for events that do not involve a release in progress. The NRC Resident Inspector has been notified.

• * * UPDATE AT 1605 EST ON 2/12/2018 FROM JEREMY MORTON TO MARK ABRAMOVITZ * * *

At 1258 CST, TSC ventilation was declared operable. A start permissive lever was adjusted to remedy interference. The licensee notified the NRC Resident Inspector.

At 2257 CDT on September 30, 2013 the Callaway Plant Emergency Off-Site Facility (EOF) was declared nonfunctional due to air in-leakage outside acceptance criteria while ventilation is in filtration mode. Efforts are underway to restore the air in-leakage within acceptance criteria at the EOF. If EOF activation is necessary during the period of EOF non-functionality, the Recovery Manager will evaluate the suitability of the facility for the specific conditions of the event. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the unavailability of an emergency response facility. The NRC Senior Resident Inspector has been notified.

• * * UPDATE FROM RICHARD HUGHEY TO JOHN SHOEMAKER AT 0248 EDT ON 10/02/13 * * *

Repairs were made to the EOF ventilation system and all required post-maintenance testing has been completed satisfactorily. The EOF has been restored to a functional status. The licensee will notify the NRC Resident Inspector. Notified R4DO (Gepford).

At 0438 (CDT) on Thursday, May 17, the Callaway Plant Emergency Operations Facility (EOF) was declared non-functional when the building's return fan was found not running. Loss of the EOF return fan, results in an inability to maintain a positive pressure on the facility. Efforts are underway to return this fan to service. If an emergency is declared requiring EOF activation while the EOF is non-functional, EOF emergency response personnel will report to their backup locations in accordance with Callaway Plant emergency planning procedures. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the unavailability of an emergency response facility. The NRC Resident Inspector has been notified.

• * * UPDATE FROM BRANDON LONG TO JOHN SHOEMAKER ON 05/17/12 AT 1704 EDT * * *

At 1330 (CDT) on 05/17/12, the Callaway Plant EOF was been returned to service. The licensee will notify the NRC Resident Inspector. Notified R4DO (Powers).

At 0850 (CDT) on Monday, October 03, the Callaway Plant Technical Support Center (TSC) is undergoing planned maintenance to repair MTSUB7001, Manual Transfer Switch between normal and emergency power. This maintenance is currently scheduled to last for 1 day, at which time the TSC will be restored to service. During this period, the TSC will be without either normal or emergency power, thus rendering it non-functional. If an emergency is declared requiring TSC activation while the TSC is non-functional, TSC emergency response personnel will report to their backup locations in accordance with Callaway Plant emergency planning procedures. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the planned unavailability of an emergency response facility.

• * * UPDATE AT 1907 EDT ON 10/03/11 FROM GERRY RAUCH TO JOE O'HARA * * *

Callaway Plant Technical Support Center (TSC) normal power was restored at 1751 CDT. The TSC is functional and available as an emergency response facility. The NRC Resident Inspector has been notified. Notified R4DO (Whitten).

At 1430 on 2-1-2011, due to worsening road conditions from heavy snowfall, a determination was made that there is a loss of plant access for some individuals and some impairment of evacuation routes. This meets the criteria for an immediate notification (8 Hour) per 10 CFR 50.72 (b)(3)(xiii). There is no impact on plant operation, all T/S (Technical Specification) required minimum staffing requirements are satisfied. The weather is predicted to be hazardous until the evening of 2/2/2011. The Missouri Department of Transportation reported they have a plow truck running from Callaway Plant to Jefferson City, MO. They also reported visibility is extremely poor due to blowing snow. The Missouri State Emergency Management Agency duty officer has been notified of the degraded Callaway ERO (Emergency Response Organization) response time and evacuation route issues. The NRC Resident Inspector was notified of this event by the licensee. Two shifts of personnel will be on site throughout this event. Diesel fuel, food, and water are above required minimums.

• * * UPDATE FROM DAVID BONVILLIAN TO JOHN KNOKE AT 1821 EST ON 02/02/11 * * *

As of 1600 (CST) on 2/2/2011, road conditions have significantly improved. Primary evacuation routes have been reported to be passable. There is reasonable assurance of normal ERO response time. NRC Resident Inspector has been informed of the intent of this change and will be notified of this communication. Notified R4DO (Howell).

Loss of ventilation to an emergency response facility: Emergency Operations Facility (EOF). During performance of the EOF diesel generator operability test, the EOF ventilation system was placed in filtration mode. The air conditioning unit and air return fan did not run. Emergency Preparedness personnel evaluated the habitability of the EOF and determined that the filtration mode of the ventilation system was not functional. Because of the loss of the ventilation function for the EOF, the facility was not functional. The EOF is available for emergency response purposes unless the temperature could not be maintained or a release is in progress. The backup EOF is available for use if needed. Repair of the EOF's ventilation system is in progress. This is reported per 10CFR50.72(b)(3)(xiii). The licensee will notify the NRC Resident Inspector.

• * * UPDATE FROM STEVE SAMPLE TO DONALD NORWOOD AT 1620 10/12/09 * * *

The EOF was restored to operable status at 1247 CDT. The licensee notified the NRC Resident Inspector. Notified R4DO (Campbell).

This report is being made pursuant to 10CFR50.72(b)(3)(xiii), 8-hour Non-Emergency Report due to the loss of emergency assessment capability. The normal AC power supply and backup diesel generator were taken out of service for planned load center cleaning maintenance activities and the Technical Support Center (TSC) was declared non functional at 0703 Central Daylight Time on 8/31/2007. The maintenance activities are expected to last approximately 16 hours. Affected Emergency Response Organization members have been, instructed to report to designated backup facilities, per procedure EIP-ZZ-00240, in the event of an emergency. Though this does not affect state or local response capabilities, the SEMA Senior Radiological Emergency Program Planner and local personnel have been notified of this planned maintenance outage as a courtesy. The licensee has notified the NRC Resident Inspector.

• * * UPDATE ON 08/31/07 AT 1730 EDT BY STEVE KOCHERT TO MACKINNON * * *

The normal AC power supply and backup diesel generator were restored to service and the TSC was declared functional at 1627 CDT on 8/31/2007. Affected Emergency Response Organization members have been instructed to resume normal use of the TSC in the event of a emergency. The licensee has notified the NRC Resident Inspector. R4DO (Troy Pruett) notified.

This report is being made pursuant to 10CFR50.72(b)(3)(xiii), 8-hour Non-Emergency Report due to the loss of emergency assessment capability. The TSC filter absorber unit (FUB7001) and the TSC were declared non-function at 0738 Central Daylight Savings Time on 4/13/2006 for charcoal replacement activities. Charcoal replacement activities have an estimated completion time of 2000 on 4/13/2006. Affected Emergency Response Organization members have been instructed in the event of an emergency to report to designated backup facilities. Callaway Plant is currently operating in Mode 1 at 100% power. Normal plant operation is unaffected by the loss of ventilation filtration. The licensee has notified the NRC Resident Inspector.

• * * UPDATE AT 1855 ON 4/13/06 FROM D. LANTZ TO W. GOTT * * *

Maintenance and post maintenance testing activities for charcoal replacement in the TSC filter absorber unit have been completed. The TSC filter absorber unit and the TSC were declared functional and restored to service at 1738 CDST on 4/13/06 Notified R4DO (T. Pruett)

The following information was provided by the licensee via facsimile: At approximately 05:04 CST on 01/13/2005, CaIlaway Plant became aware of a partial loss of commercial out-going offsite communication ability and the ENS, HPN, and ERDS lines. Contact (capability) was established with the NRC Operations Center via commercial phone lines. Internal and in-coming (commercial) communications are not affected and a number out-going lines are available for emergency use. Callaway is currently reassigning available out-going lines to emergency facilities. Backup communication methods to offsite State and Local agencies remains available. ENS communication will be conducted via commercial phone lines to the NRC Operations Center. At approximately 05:30 CST Callaway was notified that the communications failure was the result of a severed fiber optic cable at an unknown location. At approximately 09:45 CST Callaway was informed that approximately 4000 feet of fiber optic cable was lost when a bridge near St. Louis, MO., collapsed due to flood waters. At this time there is no estimate for the completion of repairs, but the condition is expected to last up to one week due to inaccessibility resulting from rising flood waters. The licensee has notified the NRC Resident Inspector, State, and local government agencies.

• * * UPDATE ON 03/15/05 @ 1711 BY JUSTIN HILLER TO CHAUNCEY GOULD * * *

The following information was provided by the licensee via facsimile: The licensee received confirmation at 11:21 CST on 3/15/2005 that permanent repairs were completed to fiber optic lines supporting offsite communications including ENS, HPN and ERDS lines at 06:00 CST on 03/13/2005. This repair replaces a temporary repair established at approximately 14:24 CST on 1/13/2005, and includes the preventive measure of burying the lines below the river bed to prevent subsequent washouts. In addition, the original notification is being corrected to reflect that the fiber optic lines were washed-out from beneath the bridge as opposed to the bridge having collapsed as was originally reported to the licensee. The NRC Resident Inspector was updated. Notified Reg 4 RDO Farnholtz

At 1155, 7/21/04, Callaway Plant declared the Emergency Offsite Facility (EOF) inoperable due to unacceptable air flow rates when the ventilation system was in the Filtration mode. Normally the ventilation system is designed to operate with a positive pressure in the EOF in order to prevent in-leakage of unfiltered air. During regularly scheduled maintenance, it was discovered that if a fume hood exhaust fan was operated with the EOF ventilation in the Filtration mode, it was possible to develop a negative pressure condition within the EOF. A station Work Request has been generated and ventilation equipment has been aligned so that a positive pressure can be maintained until the problem has been corrected. The licensee noted that regularly scheduled maintenance is performed on a yearly frequency. The licensee informed the NRC Resident Inspector.

• * * UPDATE ON 07/29/04 @ 1640 BY EURMAN HENSON TO CHAUNCEY GOULD * * * RETRACTION

7/29/04: A review was conducted of both the test data obtained on 7/21/04 and the methodology utilized. This review determined that the methodology was incorrect and resulted in unsatisfactory test data. The test was performed again on 7/23/04 with satisfactory results. Based upon this information, it was concluded that the EOF had not been inoperable as initially reported and this Event Notification is being retracted. The NRC Resident Inspector was notified. Notified Reg 4 RDO (Russ Bywater)

On 1/14/04 a problem with emergency notification sirens was identified and traced to a manufacturing defect in components supplied by Federal Signal Corporation. Investigations were initiated to determine if this situation was applicable to Callaway. At 1230, 1/21/04, Federal Signal Corporation notified Callaway Plant that there was a potential for siren inoperability due to a temperature sensitive piece of equipment. It was determined that 19 out of 29 emergency sirens were subject to this potential failure if ambient temperatures fall below approximately 20 degrees F. The model number of the questionable sirens is EOWS612. Callaway conducted a "quiet test" of the questionable sirens and 4 of the sirens indicated a problem. At present the ambient temperature is above 32 degree F and it is believed that the four questionable sirens are not experiencing the temperature related failure. A field test of the four sirens is being conducted this evening to determine their operability. Alternate methods of public notification have been established. The failure mechanism has been identified by the vendor and temporary repairs will begin by 1/22/04. The licensee notified State and local agencies, FEMA, and the NRC Resident Inspector.

• • • • Update on 01/23/04 at 1455 EST by E. Henson taken by MacKinnon****

This event is an update to EN# 40462 in which Callaway reported that 19 of 29 emergency sirens were potentially susceptible to temperature sensitivity. A field test of four suspect sirens was completed by 1900, 01/21/04, and it was established that all four sirens were operable. All 19 of the emergency sirens using electronic circuits that were potentially susceptible to temperature sensitivity, had temporary heating elements installed on 01/23/04, thus eliminating the temperature sensitivity problem. Federal Signal Corporation expects to have a permanent solution identified and permanent repairs completed within 3 weeks." R4DO (Linda Howell) notified. The NRC Resident Inspector was notified of this update by the licensee.

• * * UPDATE ON 02/17/04 AT 13:28 EST FROM R. BARTON TO A. COSTA * * *

This is an update to EN # 40462 in which Callaway reported that 19 of 29 emergency sirens were potentially susceptible to temperature sensitivity. Permanent repairs were completed 2/13/04 to eliminate the temperature sensitivity problem. All affected sirens have been successfully tested. The NRC Resident Inspector will be notified of this update by the licensee. Notified R4DO (Whitten).