Event Notification Report for September 06, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/05/2002 - 09/06/2002
Other Nuclear Material
Event Number: 39171
Rep Org: MARYLAND RADIATION HEALTH PROGRAM
Licensee: MARYLAND REGIONAL CANCER CENTER
Region: 1
City: SILVER SPRINGS State: MD
County:
License #: MD-31-303-01
Agreement: Y
Docket:
NRC Notified By: RAY MANDLEY
HQ OPS Officer: RICH LAURA
Licensee: MARYLAND REGIONAL CANCER CENTER
Region: 1
City: SILVER SPRINGS State: MD
County:
License #: MD-31-303-01
Agreement: Y
Docket:
NRC Notified By: RAY MANDLEY
HQ OPS Officer: RICH LAURA
Notification Date: 09/06/2002
Notification Time: 17:30 [ET]
Event Date: 09/06/2002
Event Time: 12:40 [EDT]
Last Update Date: 09/06/2002
Notification Time: 17:30 [ET]
Event Date: 09/06/2002
Event Time: 12:40 [EDT]
Last Update Date: 09/06/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
RICHARD BARKLEY (R1)
THOMAS ESSIG (NMSS)
RICHARD BARKLEY (R1)
THOMAS ESSIG (NMSS)
MARYLAND AGREEMENT STATE REPORT ON CANCER TREATMENT EQUIPMENT MALFUNCTION
The Agreement State reported a malfunction of a cancer treatment machine made by Nucletron Corporation, model 105.999, serial number 31307. The malfunction occurred at the end of a treatment session when the device emergency motor failed to return the source to the shielded position. The source got hung up in the guide tube. The radioactive source is 4.9 curies of IR-192. The source was manually cranked into the shielded position by the medical physicist. No personnel overexposure occurred.
The Agreement State reported a malfunction of a cancer treatment machine made by Nucletron Corporation, model 105.999, serial number 31307. The malfunction occurred at the end of a treatment session when the device emergency motor failed to return the source to the shielded position. The source got hung up in the guide tube. The radioactive source is 4.9 curies of IR-192. The source was manually cranked into the shielded position by the medical physicist. No personnel overexposure occurred.
Power Reactor
Event Number: 39324
Facility: LIMERICK
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: SCLIENDELMAN
HQ OPS Officer: JOHN MacKINNON
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: SCLIENDELMAN
HQ OPS Officer: JOHN MacKINNON
Notification Date: 10/28/2002
Notification Time: 16:54 [ET]
Event Date: 09/06/2002
Event Time: 14:38 [EDT]
Last Update Date: 10/28/2002
Notification Time: 16:54 [ET]
Event Date: 09/06/2002
Event Time: 14:38 [EDT]
Last Update Date: 10/28/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
DAVID SILK (R1)
DAVID SILK (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
INADVERTENT PRIMARY CONTAINMENT ISOLATION SIGNAL
"On September 6, 2002 at 14:38 hours, an inadvertent primary isolation signal was initiated due to a false reactor low level signal. The isolation occurred during the 24-month Reactor Protection System (RPS) surveillance test on Unit 2 Scram Discharge Volume (SDV) level instrument. The affected Group 6C primary containment isolation valves (PCIVs) automatically closed as a result of the isolation signal. Inboard PCIVs on the suppression pool hydrogen and oxygen sampling system closed. In addition, the inboard PCIVs for the primary containment leak detector radiation monitor closed as designed. Inboard and outboard PCIVs for the "2A" containment hydrogen recombiner received an isolation signal but were in a closed position prior to the event. All systems functioned successfully during the event
"The cause of the event was mispositioning of the Calibration Select and Command switch on the Rosemount Readout Assembly by the technician performing the test. The test was aborted and the isolation signal was reset. The valves that repositioned were restored to the pre-test configuration and the test was performed successfully. A work group standdown was conducted to review the lessons learned from this event.
"This event is reportable per 10 CFR50.73(a)(2)(iv)(A) since PCIVs automatically closed on more than one system
"Component data:
Manufacturer: Rosemount Nuclear Instruments, Inc.
Model number: 710DU
Serial number: 66722"
The NRC Resident Inspector was notified of this invalid automatic actuation by the licensee.
"On September 6, 2002 at 14:38 hours, an inadvertent primary isolation signal was initiated due to a false reactor low level signal. The isolation occurred during the 24-month Reactor Protection System (RPS) surveillance test on Unit 2 Scram Discharge Volume (SDV) level instrument. The affected Group 6C primary containment isolation valves (PCIVs) automatically closed as a result of the isolation signal. Inboard PCIVs on the suppression pool hydrogen and oxygen sampling system closed. In addition, the inboard PCIVs for the primary containment leak detector radiation monitor closed as designed. Inboard and outboard PCIVs for the "2A" containment hydrogen recombiner received an isolation signal but were in a closed position prior to the event. All systems functioned successfully during the event
"The cause of the event was mispositioning of the Calibration Select and Command switch on the Rosemount Readout Assembly by the technician performing the test. The test was aborted and the isolation signal was reset. The valves that repositioned were restored to the pre-test configuration and the test was performed successfully. A work group standdown was conducted to review the lessons learned from this event.
"This event is reportable per 10 CFR50.73(a)(2)(iv)(A) since PCIVs automatically closed on more than one system
"Component data:
Manufacturer: Rosemount Nuclear Instruments, Inc.
Model number: 710DU
Serial number: 66722"
The NRC Resident Inspector was notified of this invalid automatic actuation by the licensee.