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On April 13, 2010 at 1200 CDT, Callaway Un … On April 13, 2010 at 1200 CDT, Callaway Unit 1 declared an Unusual Event due to identified leakage of greater than 25 gallons per minute (EAL SU6.1). During the flushing of the 'A' Chemical and Volume Control System mixed bed demineralizer, a leak occurred from the vent valve exceeding 25 gallons per minute for approximately 5 minutes. The leak was isolated and the Unusual Event was terminated at 1223 CDT. No personnel contamination or outside release occurred.</br>The licensee has notified the State and local authorities and the NRC Resident Inspector.</br>* * * UPDATE FROM WALTER GRUER TO DONG PARK AT 1614 EDT on 04/13/2010 * * * </br>Callaway Plant declared an Unusual Event at 1200 CDT on 4/13/2010. The cause of the event was Emergency Action Level (EAL) SU6.1, identified leakage greater than 25 gallons per minute (gpm). </br>When attempting to place the 'A' Chemical and Volume Control System (CVCS) mixed bed demineralizers in service, a drop in the Volume Control Tank (VCT) level was noted by the Reactor Operator (RO). Technical Specification (TS) 3.4.13 Condition A was entered at 1033 CDT upon identification of identified leakage of the Reactor Coolant System (RCS) greater than 10 gpm.</br>TS 3.4.13 Condition A requires reduction of leakage to limits within 4 hours. The leakage was verified to be stopped at 1038 CDT, at which time TS 3.4.13.A was exited. The system was restored to a normal alignment. </br>Upon review, it was determined that the VCT level dropped approximately 125 gallons in 5 minutes. EAL SU6.1 was declared at 1200 CDT and closed at 1223 CDT. </br>The state and local counties (Callaway, Gasconade, Montgomery, and Osage) were notified of the event at 1210 CDT and of the event closeout at 1227 CDT. </br>The NRC Resident Inspector was notified of the event. A news release will be made by Ameren Corporate Communications.</br>Notified R4DO (Spitzberg), NRR EO (Nelson), and IRD (Marshall).</br>* * * RETRACTION ON 4/20/10 AT 1417 EDT FROM DAVID HURT TO R. ALEXANDER * * *</br>The declaration of Unusual Event SU6.1, RCS leakage, on 4/13/10 is being retracted, because the declaration was inaccurate. The leak was an isolable intersystem leak of the CVCS, not RCS leakage, and the leak was stopped within the 15 minute time period allowed to determine EAL applicability. Therefore, the leakage did not meet the Initiating Condition for the EAL.</br>The NRC Resident Inspectors have been notified.</br>Notified R4DO (J. Whitten).been notified.
Notified R4DO (J. Whitten).
17:00:00, 13 April 2010 +
45,837 +
13:17:00, 13 April 2010 +
17:00:00, 13 April 2010 +
On April 13, 2010 at 1200 CDT, Callaway Un … On April 13, 2010 at 1200 CDT, Callaway Unit 1 declared an Unusual Event due to identified leakage of greater than 25 gallons per minute (EAL SU6.1). During the flushing of the 'A' Chemical and Volume Control System mixed bed demineralizer, a leak occurred from the vent valve exceeding 25 gallons per minute for approximately 5 minutes. The leak was isolated and the Unusual Event was terminated at 1223 CDT. No personnel contamination or outside release occurred.</br>The licensee has notified the State and local authorities and the NRC Resident Inspector.</br>* * * UPDATE FROM WALTER GRUER TO DONG PARK AT 1614 EDT on 04/13/2010 * * * </br>Callaway Plant declared an Unusual Event at 1200 CDT on 4/13/2010. The cause of the event was Emergency Action Level (EAL) SU6.1, identified leakage greater than 25 gallons per minute (gpm). </br>When attempting to place the 'A' Chemical and Volume Control System (CVCS) mixed bed demineralizers in service, a drop in the Volume Control Tank (VCT) level was noted by the Reactor Operator (RO). Technical Specification (TS) 3.4.13 Condition A was entered at 1033 CDT upon identification of identified leakage of the Reactor Coolant System (RCS) greater than 10 gpm.</br>TS 3.4.13 Condition A requires reduction of leakage to limits within 4 hours. The leakage was verified to be stopped at 1038 CDT, at which time TS 3.4.13.A was exited. The system was restored to a normal alignment. </br>Upon review, it was determined that the VCT level dropped approximately 125 gallons in 5 minutes. EAL SU6.1 was declared at 1200 CDT and closed at 1223 CDT. </br>The state and local counties (Callaway, Gasconade, Montgomery, and Osage) were notified of the event at 1210 CDT and of the event closeout at 1227 CDT. </br>The NRC Resident Inspector was notified of the event. A news release will be made by Ameren Corporate Communications.</br>Notified R4DO (Spitzberg), NRR EO (Nelson), and IRD (Marshall).</br>* * * RETRACTION ON 4/20/10 AT 1417 EDT FROM DAVID HURT TO R. ALEXANDER * * *</br>The declaration of Unusual Event SU6.1, RCS leakage, on 4/13/10 is being retracted, because the declaration was inaccurate. The leak was an isolable intersystem leak of the CVCS, not RCS leakage, and the leak was stopped within the 15 minute time period allowed to determine EAL applicability. Therefore, the leakage did not meet the Initiating Condition for the EAL.</br>The NRC Resident Inspectors have been notified.</br>Notified R4DO (J. Whitten).been notified.
Notified R4DO (J. Whitten).
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100 +
00:00:00, 20 April 2010 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:09:51, 2 March 2018 +
13:17:00, 13 April 2010 +
Dong Park + and David Hurt +
true +
false +
-0.155 d (-3.72 hours, -0.0221 weeks, -0.0051 months) +
17:00:00, 13 April 2010 +
TS-3.4.13 + and TS-3.4.13.A +
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