United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2007 > January 19

Event Notification Report for January 19, 2007

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
01/18/2007 - 01/19/2007

** EVENT NUMBERS **


43010 43100 43103 43106

To top of page
!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 43010
Facility: PRAIRIE ISLAND
Region: 3 State: MN
Unit: [ ] [2] [ ]
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: GENE DAMMANN
HQ OPS Officer: BILL GOTT
Notification Date: 11/25/2006
Notification Time: 04:14 [ET]
Event Date: 11/24/2006
Event Time: 19:45 [CST]
Last Update Date: 01/18/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
ANNE MARIE STONE (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N N 0 Refueling 0 Refueling

Event Text

UNANALYZED CONDITION

"With Prairie Island Unit 2 core offloaded for the 2R24 refueling outage, it was discovered that a potential common cause failure of the 21 and 22 Residual Heat Removal (RHR) Pumps may exist. A non-safety related 120 VAC motor heater circuit from Panel 2RPA3 Circuit 28 supplies power to 21 and 22 RHR Pumps. Investigation continues. The RHR system is not required by the current operating mode.

"The RHR Pumps on the operating unit (Unit 1) are supplied from separate 120 VAC panels so the concern does not exist for the 11 and 12 RHR pumps."

The licensee notified the NRC Resident Inspector.

* * * RETRACTION PROVIDED BY J. STRICKLAND TO KOZAL ON 1/18/07 AT 1322 EST * * *

"Event Number 43010 (reported 11/24/06) reported a potential single failure vulnerability of the Unit 2 residual heat removal (RHR) pumps. NMC identified that power cables for the motor heaters in each pump were powered from the same 120 Volt panel and that the heater power cables were routed for some distance in the same conduit. The concern was that an electrical fault could propagate from one RHR pump motor to the opposite train RHR pump motor. Further engineering evaluation has determined that no credible failure mechanism exists that could cause a fault in one RHR pump motor to propagate to the opposite train RHR pump motor. Since the dielectric strength of insulation on the heaters is greater than the dielectric strength of the air between the motor windings and the motor frame or the stator, any fault in the motor windings would be to ground (and, thus, interrupted by the ground fault protective relaying). Therefore, no potential single failure vulnerability existed in the as-found condition and NMC hereby retracts the event reported on 11/24/06 (Event Number 43010)."

The licensee notified the NRC Resident Inspector.

Notified the R3DO (H. Peterson).

To top of page
General Information or Other Event Number: 43100
Rep Org: CALIFORNIA RADIATION CONTROL PRGM
Licensee: KRAZAN AND ASSOCIATES
Region: 4
City: ONTARIO State: CA
County:
License #: 6809-36
Agreement: Y
Docket:
NRC Notified By: BARBARA HAMRICK
HQ OPS Officer: BILL GOTT
Notification Date: 01/15/2007
Notification Time: 14:18 [ET]
Event Date: 01/12/2007
Event Time: 19:00 [PST]
Last Update Date: 01/15/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
AGREEMENT STATE
Person (Organization):
BLAIR SPITZBERG (R4)
JANET SCHLUETER (NMSS)
ILTAB Email ()
Mexico Email ()

This material event contains a "Less than Cat 3" level of radioactive material.

Event Text

AGREEMENT STATE REPORT - STOLEN MOISTURE DENSITY GAUGE

The State provided the following information via email:

"On January 15, 2007, about 10:00 am, the [California] DHS Duty Officer received a call regarding a stolen Troxler, Model 3430 Moisture/Density Gauge (SN 35954), containing a nominal 8 millicuries Cs-137 and 40 millicuries Am-241. The gauge user went to his home, after work on Friday, January 12, 2007, to have dinner, before returning the gauge to the authorized storage location. The gauge was chained in an open-bed pick-up truck. When the user returned to the truck, between 7:00 - 7:30 pm that evening, the chains had been cut, and the gauge was gone. The user did not report this to the licensee's home office until approximately 9:30 am, Monday, January 15, 2007, at which time, the licensee phoned the police, and notified [CA] DHS. RHB will follow-up with the licensee on this issue."

State report number: 011507

THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks.

To top of page
General Information or Other Event Number: 43103
Rep Org: UTAH DIVISION OF RADIATION CONTROL
Licensee: SHAW PIPE LINE SERVICES
Region: 4
City: TULSA State: OK
County:
License #: 35-23193-01
Agreement: Y
Docket:
NRC Notified By: GWYN GALLOWAY
HQ OPS Officer: BILL GOTT
Notification Date: 01/16/2007
Notification Time: 13:38 [ET]
Event Date: 01/15/2007
Event Time: 11:00 [CST]
Last Update Date: 01/16/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
AGREEMENT STATE
Person (Organization):
VIVIAN CAMPBELL (R4)
SCOTT FLANDERS (NMSS)

Event Text

AGREEMENT STATE REPORT - RADIOGRAPHY CAMERA MALFUNCTION

At 1100 on 01/15/07, the radiography crew reported a radiography camera malfunction to their Radiation Safety Officer. The crew was using a Model SPEC 150 radiography exposure device with a 71 curie Ir-192 source. The radiography source had become disconnected from the drive cable and was stuck in the guide tube near the collimator. The guide tube was not crimped and the cause of the disconnect is not known. The crew covered the collimator with sand bags to limit access. That afternoon after consulting with SPEC, the crew was able to retract the source using a tong type apparatus. The licensee will return the camera to SPEC for repairs. There were no abnormal exposures. The crew was from Oklahoma and was working near Bonanza, Utah under a reciprocity agreement.

To top of page
Power Reactor Event Number: 43106
Facility: FARLEY
Region: 2 State: AL
Unit: [ ] [2] [ ]
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: CHARLES BAREFIELD
HQ OPS Officer: JOHN KNOKE
Notification Date: 01/18/2007
Notification Time: 21:08 [ET]
Event Date: 01/18/2007
Event Time: 16:00 [CST]
Last Update Date: 01/18/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP
Person (Organization):
ROBERT HAAG (R2)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N Y 100 Power Operation 100 Power Operation

Event Text

BATTERY CHARGER ROOM COOLER INOPERABLE

"Entered a condition which required TS 3.0.3 entry and an 8 hour report. While the 2B RHR equipment outage was in progress, it was discovered that the 2A Battery Charger room cooler was not operating. The condition was investigated and it was found that the thermal overloads were tripped on the supply breaker. They were reset and the fan was restarted. The shift observed the fan operation for 10 minutes and then decided to check the breaker every 30 minutes until a plan could be implemented to swap trains of battery chargers. During the first 30 minute check, the breaker overloads were found tripped again. See time line below.

"This put us in a condition where an LOSF existed on both trains of RHR due to the requirement to evaluate supported systems when opposite train LCO's are entered.
02:00 2B RHR tagged out for equipment outage, entered LCO for RHR.
16:00 2A Battery Charger room cooler found not running. Entered LCO for DC sources.
16:35 Overloads reset on 2A Battery Charger room cooler supply breaker and fan restarted. LCO initially cleared, but now will conservatively be reinstated since the overloads tripped again later.
17:02 2A Battery Charger room cooler breaker thermal overloads found tripped again.
17:26 2B RHR tagged in and made available, but not yet operable (still need to perform surveillance),
17:37 Swing Battery Charger (2C) placed in service for 2A. Exited LCO for DC sources.

"LCO 3.0.3 was applicable from 16:00 until 17:37. Condition is reportable under 10CFR50.72(b)(3)(v) 'Event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to ... remove residual heat.'"

The licensee notified the NRC Resident Inspector.

Page Last Reviewed/Updated Thursday, March 29, 2012
Thursday, March 29, 2012