Event Notification Report for January 05, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/04/2002 - 01/05/2002
EVENT NUMBERS
38609
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 38609
Facility: PRAIRIE ISLAND
Region: 3 State: MN
Unit: [1] [2] []
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: WAYNE IRVIN
HQ OPS Officer: LEIGH TROCINE
Region: 3 State: MN
Unit: [1] [2] []
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: WAYNE IRVIN
HQ OPS Officer: LEIGH TROCINE
Notification Date: 01/05/2002
Notification Time: 23:33 [ET]
Event Date: 01/05/2002
Event Time: 17:50 [CST]
Last Update Date: 01/22/2002
Notification Time: 23:33 [ET]
Event Date: 01/05/2002
Event Time: 17:50 [CST]
Last Update Date: 01/22/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
GARY SHEAR (R3)
GARY SHEAR (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
DISCOVERY THAT PROPANE TANKS ON SITE EXCEEDED THE VOLUME ASSUMED IN THE CONTROL ROOM HABITABILITY TOXIC GAS ANALYSIS
The following text is a portion of a facsimile received from the licensee:
"Propane tanks on site exceeded the volume assumed in the toxic gas analysis for control room habitability. The analysis assumes 1,000 gallons were available for release. Instead, there were two locations were two 1,000-gallon tanks were available for release (filled with propane on January 4th and then emptied on January 4th). Upon determination that the 1,000-gallon limit was exceeded, the control room outside air intake dampers were closed and remained closed until the tanks were emptied. Reanalysis (completed today) assuming a release of 2,000 gallons results in the calculated concentration of propane in the control room exceeding the acceptance criteria."
The licensee stated that there was nothing unusual or misunderstood and that all systems functioned as required.
The licensee plans to notify the NRC resident inspector.
* * * RETRACTED AT 1636 EST ON 1/22/02 BY ANDREWS TO FANGIE JONES * * *
"The event reported on January 5, 2002 (Propane tanks on-site exceeded the volume assumed in the toxic gas analysis for the control room. NRC Event Number 38609) is hereby retracted.
"Subsequent analysis (via updated methodology, consistent with the guidance in the proposed Revision 1 to Reg Guide 1.78, 'EVALUATING THE HABITABILITY OF A NUCLEAR POWER PLANT CONTROL ROOM DURING A POSTULATED HAZARDOUS CHEMICAL RELEASE') has demonstrated that the maximum propane concentration in the control room would be well below the acceptable level.
"Thus, although the plant had been in an unanalyzed condition, that condition has now been shown to have not significantly degraded plant safety and is, therefore, not reportable under the requirements 10 CFR 50.72(b)(3)(ii)(B)."
The licensee notified the NRC Resident Inspector. The R3DO (Sonia Burgess) has been informed.
The following text is a portion of a facsimile received from the licensee:
"Propane tanks on site exceeded the volume assumed in the toxic gas analysis for control room habitability. The analysis assumes 1,000 gallons were available for release. Instead, there were two locations were two 1,000-gallon tanks were available for release (filled with propane on January 4th and then emptied on January 4th). Upon determination that the 1,000-gallon limit was exceeded, the control room outside air intake dampers were closed and remained closed until the tanks were emptied. Reanalysis (completed today) assuming a release of 2,000 gallons results in the calculated concentration of propane in the control room exceeding the acceptance criteria."
The licensee stated that there was nothing unusual or misunderstood and that all systems functioned as required.
The licensee plans to notify the NRC resident inspector.
* * * RETRACTED AT 1636 EST ON 1/22/02 BY ANDREWS TO FANGIE JONES * * *
"The event reported on January 5, 2002 (Propane tanks on-site exceeded the volume assumed in the toxic gas analysis for the control room. NRC Event Number 38609) is hereby retracted.
"Subsequent analysis (via updated methodology, consistent with the guidance in the proposed Revision 1 to Reg Guide 1.78, 'EVALUATING THE HABITABILITY OF A NUCLEAR POWER PLANT CONTROL ROOM DURING A POSTULATED HAZARDOUS CHEMICAL RELEASE') has demonstrated that the maximum propane concentration in the control room would be well below the acceptable level.
"Thus, although the plant had been in an unanalyzed condition, that condition has now been shown to have not significantly degraded plant safety and is, therefore, not reportable under the requirements 10 CFR 50.72(b)(3)(ii)(B)."
The licensee notified the NRC Resident Inspector. The R3DO (Sonia Burgess) has been informed.