Local News: “Breaking… Alert… leak shuts down US nuclear plant” — Gov’t: Radiation levels ‘above normal’ — ‘Steam plume’ seen in reactor building, workers can’t find where leak is coming from due to safety concerns — Flood warnings issued for area
Published: July 23rd, 2015 at 7:00 pm ET
US NRC Event Notification Report, Jul 23, 2015 (emphasis added): Callaway Plant initiated a shutdown required by Technical Specifications (TS)… TS 3.4.13 Condition A was entered due to unidentified RCS [reactor coolant system] leakage being in excess of the 1 gpm TS limit. The leak was indicated by an increase in containment radiation readings… A containment entry identified a steam plume; due to personnel safety the exact location of the leak inside the containment building could not be determined. At this time radiation levels inside [the] containment are stable and slightly above normal. There have been no releases from the plant above normal levels.
Power Reactor Event Number: 51253
Region: 4 State: MO
Unit:  [ ] [ ]
RX Type:  W-4-LP
NRC Notified By: WALTER GRUER
HQ OPS Officer: JEFF HERRERA Notification Date: 07/23/2015
Notification Time: 04:21 [ET]
Event Date: 07/23/2015
Event Time: 01:15 [CDT]
Last Update Date: 07/23/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(i) – PLANT S/D REQD BY TS
50.72(b)(2)(xi) – OFFSITE NOTIFICATION
HEATHER GEPFORD (R4DO)
SCOTT MORRIS (NRR)
JEFFERY GRANT (IRD)
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 0 Cold Shutdown
INITIATION OF PLANT SHUTDOWN DUE TO RCS LEAKAGE
“On July 23, 2015 at 0115 [CDT], Callaway Plant initiated a shutdown required by Technical Specifications (TS). At 2139 [CDT] on July 22, 2015, TS 3.4.13 Condition A was entered due to unidentified RCS leakage being in excess of the 1 gpm TS limit. The leak was indicated by an increase in containment radiation readings, increasing sump levels, and decreasing levels in the Volume Control tank (VCT).
“A containment entry identified a steam plume; due to personnel safety the exact location of the leak inside the containment building could not be determined.
“At this time radiation levels inside [the] containment are stable and slightly above normal. There have been no releases from the plant above normal levels.
“The [NRC] Senior Resident Inspector was notified.”
* * * UPDATE PROVIDED BY ROB STOUGH TO JEFF ROTTON AT 1757 EDT ON 07/23/2015 * * *
“Callaway entered TS 3.4.13 Condition B at 0053 [CDT on July 23, 2015] for the subject leakage since reactor coolant pressure boundary leakage could not be ruled out by visual inspection. The estimated leak rate when the decision was made to shut down the plant was approximately 1.8 gpm. The plant entered Mode 3 at 0600 CDT.
“Additionally, at approximately 1315, it was determined that the duration of the required outage would be greater than three days, thus requiring notification to the Missouri Public Service Commission. This offsite notification is reportable to the NRC [per 10CFR50.72(b)(2)(xi)], and the above table has been updated to reflect this reporting requirement.”
The licensee notified the NRC Resident Inspector.
Notified R4DO (Gepford).
AP, Jul 23, 2015: Missouri Nuclear Plant Shut Down After ‘Non-Emergency’ Leak… Jeff Trammel, a spokesman for St. Louis-based Ameren, called it a “minor steam leak.”… Ameren officials are investigating the cause… it was unclear when the plant would restart… [NRC] inspectors are at the plant.
Missouri Times, Jul 23, 2015: Unplanned Shutdown & Elevated Radioactive Levels at Ameren Missouri’s Callaway 1 Nuclear Reactor Containment Building… Nuclear Regulatory Commission (NRC) issued an event notice for the unplanned shutdown of the Callaway 1 nuclear reactor… The NRC notes that radiation is above normal in the containment building.
Jefferson City News Tribune, Jul 23, 2015 at 2:26p: Alert – Steam leak shuts down Callaway…
Jefferson City News Tribune, Jul 23, 2015: Breaking News – Steam leak shuts down Callaway Plant… Company officials are trying to determine the cause of the problem, which they said “has been contained.”
ABC 17, Jul 23, 2015 — Callaway FLOOD WARNING: Issued at: 9:52 am CDT on July 23, 2015, expires at: 4:00 AM CDT on July 26, 2015. The Flood Warning continues for the Missouri River near Chamois until Friday afternoon. At 7:00 am Thursday the stage was 19.5 feet. Flood stage is 17.0 feet. Minor flooding is occurring.
Previous event at Callaway: Emergency declared at US nuke plant: Fire shuts down reactor — “Reports of black smoke” — Company says no radiation release “above normal operating limits”