United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2006 > October 25

Event Notification Report for October 25, 2006

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
10/24/2006 - 10/25/2006

** EVENT NUMBERS **


42165 42929 42931 42933

To top of page
Fuel Cycle Facility Event Number: 42165
Facility: PADUCAH GASEOUS DIFFUSION PLANT
RX Type: URANIUM ENRICHMENT FACILITY
Comments: 2 DEMOCRACY CENTER
                   6903 ROCKLEDGE DRIVE
                   BETHESDA, MD 20817 (301)564-3200
Region: 2
City: PADUCAH State: KY
County: McCRACKEN
License #: GDP-1
Agreement: Y
Docket: 0707001
NRC Notified By: KEVIN BEASLEY
HQ OPS Officer: BILL HUFFMAN
Notification Date: 11/22/2005
Notification Time: 15:54 [ET]
Event Date: 11/22/2005
Event Time: 12:05 [CST]
Last Update Date: 10/24/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
RESPONSE-BULLETIN
Person (Organization):
KERRY LANDIS (R2)
SCOTT FLANDERS (NMSS)

Event Text

IMPROPER CRITICALITY SPACING FOR WASTE DRUM

"At 1205 CST, on 11-22-05 the Plant Shift Superintendent was notified that during waste drum remediation activities, a drum was discovered that was in violation of one leg of double contingency. Drum #39666W has been determined to contain up to (deleted) g (grams) U235 exceeding the allowed (deleted) gram limit for NCS Spacing Exempt drums. This drum was previously located in an NCS (Nuclear Criticality Safety) Spacing Exempt storage area in violation of NCSA WMO-001 requirements. The drum was moved to the C-335 storage area under an approved Remediation Guide which established a safety basis for the movement of drums that had been roped off and posted per earlier direction. This drum is currently stored in a Temporary Fissile Storage Area maintaining a minimum 2 foot edge-to-edge spacing under NCSA WMO-001, which maintains double contingency."

SAFETY SIGNIFICANCE OF EVENTS

"While the (deleted) gram U235 limit was exceeded for this drum; DAC-832-2A1280-0001 demonstrates that drums containing less than (deleted) grams U235 in an NCS Spacing Exempt array are subcritical. The storage area is roped off and posted to prevent the addition of fissile material to the area; therefore another upset would be required before a criticality is possible."

POTENTIAL CRITICALITY PATHWAYS INVOLVED (BRIEF SCENARIO(S) OF HOW CRITICALITY COULD OCCUR)

"This drum is currently stored in the Temporary Fissile Storage Area under NCSA WMO-001, meeting double contingency. In order for a criticality to occur, two independent, unlikely, and concurrent events would have to occur."

CONTROLLED PARAMETERS (MASS, MODERATION, GEOMETRY, CONCENTRATION, ETC.)

"Double contingency is maintained by implementing two controls on mass."

ESTIMATED AMOUNT, ENRICHMENT, FORM OF LICENSED MATERIAL (INCLUDE PROCESS LIMIT AND % WORST CASE CRITICAL MASS)

"The drum has been determined to contain (deleted) grams U235. Calculations performed demonstrate that drums containing less than (deleted) grams U235 each, in an NCS Spacing Exempt array are subcritical."

NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEM(S) AND DESCRIPTION OF THE FAILURES OR DEFICIENCIES

"Although the drum contains greater than the WMO-001 limit of (deleted) grams U235 for NCS Spacing Exempt drums, it has been shown to be less than (deleted) grams U235 based on independent sample results. Calculations performed demonstrate that drums containing less than (deleted) grams U235 each, in an NCS Spacing Exempt array, are subcritical. Therefore, an additional process upset (i.e., spacing upset) would be necessary in order to have a criticality. Therefore, while the drum contained greater than (deleted) grams U235 in the spacing exempt array, the array has been shown to be subcritical for drums containing less than (deleted) grams U235 thus maintaining one leg of double contingency."

CORRECTIVE ACTIONS TO RESTORE SAFETY SYSTEMS AND WHEN EACH WAS IMPLEMENTED

"At the time of discovery, the drum was being stored according to NCS approved spacing controls. The drum will continue to be handled according to approved controls until the U235 mass can be reduced to meet the NCS Spacing Exempt criteria per NCSA WMO-001.

The NRC Senior Resident Inspector has been notified of this event."
See Related Event Report #40700.

* * * UPDATE 1802 EST ON 2/13/06 FROM K. BEASLEY TO S. SANDIN * * *

"At 1100 [CST], on 02-13-06 the Plant Shift Superintendent was notified that two additional waste drums were discovered that exceed the allowed [deleted] gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drums are currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

"The NRC Senior Resident Inspector has been notified of this event."

Notified R2DO(Ayres) and NMSS (Camper).

* * * UPDATE ON 3/20/06 AT 1859 EST FROM B. WALLACE TO HUFFMAN * * *

"At 1430, on 03-20-06, the Plant Shift Superintendent was notified that an additional waste drum has been discovered that exceeds the allowed (deleted) gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drums are currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

"The additional drum was determined to contain (deleted) grams U235. Calculations performed demonstrate that drums containing less than (deleted) grams U235 each, in an NCS Spacing Exempt array are subcritical."

The licensee notified the NRC Resident Inspector. R2DO (Ernstes) and NMSS EO (Pierson) notified.

* * * UPDATE ON 4/20/06 AT 1750 EDT FROM B. WALLACE TO HUFFMAN * * *

" At 1130, on 04-20-06 the Plant Shift Superintendent was notified that an additional waste drum has been discovered that exceeds the allowed (deleted) gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drums are currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

"The additional drum (#41663) was determined to contain (deleted) grams of U235."

The licensee notified the NRC Resident Inspector. R2DO (Lesser) and NMSS EO (Janosko) notified.

* * * UPDATE ON 4/21/06 AT 2040 EDT FROM WALKER TO HUFFMAN * * *

"At 1333, on 4-21-06 the Plant Shift Superintendent was notified that seven additional waste drums had been discovered that exceed the allowed (deleted) gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drums are currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

"Seven additional drums (41160W,41161W,41162W,41158W,41159W,40605W.41681W) were determined to contain in excess of the (deleted) gram limit of U235 but less than the (deleted) gram safety limit."

The licensee notified the NRC Resident Inspector. R2DO (Lesser) and NMSS EO (Janosko) notified.

* * * UPDATE ON 4/28/06 AT 1802 EDT FROM WALKER TO A. COSTA * * *

"At 1430, on 04-28-06 the Plant Shift Superintendent was notified that an additional waste drum has been discovered that exceeds the allowed [DELETED] gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drum is currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

"[This] one additional drum, # 43170W was determined to contain in excess of the [DELETED] gram limit of U235 but less than the [DELETED] gram safety limit."

The licensee notified the NRC Resident Inspector. Notified R2DO (Landis) and NMSS EO (Giitter).

* * * UPDATE ON 10/11/06 AT 1551 EDT FROM WALLACE TO HUFFMAN * * *

At 0900, on 10-11-06 the Plant Shift Superintendent was notified that an additional waste drum (#41470W) has been discovered that exceeds the allowed limit (but less than the safety limit) for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drum is currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

The licensee notified the NRC Resident Inspector. Notified R2DO (Decker) and NMSS EO (Essig).

* * * UPDATE ON 10/24/06 AT 1130 EDT FROM K. A. BEASLEY TO MACKINNON * * *


At 1000, on 10/24/06 the Plant Shift Superintendent was notified that an additional waste drum has been discovered that exceeds the allowed [Deleted] gram limit for NCS Spacing Exempt drums and had previously been located in an NCS Spacing Exempt storage area in violation of NCSA WMO-001. The drum is currently stored in a Temporary Fissile Storage Area under NCSA WMO-001, which maintains double contingency.

The NRC Senior Resident Inspector has been notified of this event. Notified R2DO (Brain Bonser) and NMSS (Sandra Wastler).

To top of page
Power Reactor Event Number: 42929
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: PAT RYAN
HQ OPS Officer: JOHN MacKINNON
Notification Date: 10/24/2006
Notification Time: 09:08 [ET]
Event Date: 10/24/2006
Event Time: 01:42 [CDT]
Last Update Date: 10/24/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
MARK RING (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 96 Power Operation 96 Power Operation

Event Text

HIGH PRESSURE CORE SPRAY (HPCS) DECLARED INOPERABLE FOR APPROX. 3.4 HOURS


"At 0142 on October 24, 2006, while aligning the High Pressure Core Spray system for surveillance testing of the Reactor Core Isolation Cooling System Storage Tank Level instrumentation, 1E22-F015, the Suppression Pool suction valve for the High Pressure Core Spray pump, failed to stroke fully open. High Pressure Core Spray was declared inoperable as a result. This event is considered a loss of a single train system needed to mitigate the consequences of an accident.

The High Pressure Core Spray system was restored to an operable condition at 0506 on October 24, 2006 after the suction valve was successfully stroked open and the HPCS suction source was aligned to the Suppression Pool in accordance with Technical Specification Limiting Condition for Operation 3.5.1. The cause of the event is currently under investigation."

All other Emergency Core Cooling systems were fully operable during the time period HPCS was inoperable.

The Senior Resident Inspector has been notified by the licensee.

To top of page
Other Nuclear Material Event Number: 42931
Rep Org: U.S. AIR FORCE
Licensee: U.S AIR FORCE
Region: 4
City: HILL AFB State: UT
County:
License #: 42-23539-01AF
Agreement: Y
Docket: 03028641
NRC Notified By: LTCOL MARK WRODEL
HQ OPS Officer: JOE O'HARA
Notification Date: 10/24/2006
Notification Time: 17:42 [ET]
Event Date: 03/30/2006
Event Time: 12:00 [MDT]
Last Update Date: 10/24/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
20.2201(a)(1)(i) - LOST/STOLEN LNM>1000X
Person (Organization):
JEFFREY CLARK (R4)
ROBERT PIERSON (NMSS)
ILTAB E-MAIL ()

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

Event Text

LOSS OF TWO AMERICIUM - 241 SOURCES DUE TO AIRCRAFT MISHAP

A representative from the Air Force Master Material Licensee reported that a U.S Air Force F-16 aircraft with a LANTIRN (Low Altitude Navigation and Targeting IR for Night) , targeting and ranging device attached to the aircraft, crashed in Utah's Great Salt Lake test range area near Hill AFB. The LANTIRN pod contained two 4 microCurie Am-241sources (a total of 8 micro Curie). The USAF is evaluating whether or not a recovery effort will take place.

The licensee discussed this issue with Rachel Browder NRC Region 4.

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
Power Reactor Event Number: 42933
Facility: ROBINSON
Region: 2 State: SC
Unit: [2] [ ] [ ]
RX Type: [2] W-3-LP
NRC Notified By: GARRETT SANDERS
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/25/2006
Notification Time: 06:32 [ET]
Event Date: 10/25/2006
Event Time: 02:48 [EDT]
Last Update Date: 10/25/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
MIKE ERNSTES (R2)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 M/R Y 100 Power Operation 0 Hot Standby

Event Text

MANUAL REACTOR TRIP AFTER A 100% LOAD REJECTION

"On October 25, 2006, at approximately 0247 hours (EDT), Main Control Room operators observed indications of a 100% load rejection and manually tripped the reactor at 0248 hours (EDT). During the event, Main Control Room operators received an alarm indicating that one or both pressurizer PORVs lifted briefly. The PORV(s) reclosed as designed. The reactor is currently stable in Mode 3.

"During the event, the steam generator PORVs briefly opened and re-closed, as expected. All controls rods indicated fully inserted following the reactor trip. The normal post-trip electrical lineup is providing power to the plant and the electrical system is stable at this time. Decay heat is currently being removed by use of the normal feedwater system and the condenser steam dumps.

"The cause of this event is under investigation. Follow-up notifications will be provided if important new information is obtained or plant conditions significantly change."

The licensee reported no steam generator tube leakage i.e. no radionuclide release during the brief lifting of the steam generator PORVs.

The licensee notified the NRC Resident Inspector.

Page Last Reviewed/Updated Friday, March 30, 2012
Friday, March 30, 2012