Event Notification Report for October 12, 2000
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
10/11/2000 - 10/12/2000
** EVENT NUMBERS **
37338 37422
!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!!
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|Power Reactor |Event Number: 37338 |
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| FACILITY: VOGTLE REGION: 2 |NOTIFICATION DATE: 09/18/2000|
| UNIT: [1] [] [] STATE: GA |NOTIFICATION TIME: 06:16[EDT]|
| RXTYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 09/18/2000|
+------------------------------------------------+EVENT TIME: 04:50[EDT]|
| NRC NOTIFIED BY: KEITH POPE |LAST UPDATE DATE: 10/11/2000|
| HQ OPS OFFICER: DOUG WEAVER +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |STEPHEN CAHILL R2 |
|10 CFR SECTION: | |
|AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N N 0 Cold Shutdown |0 Cold Shutdown |
| | |
| | |
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EVENT TEXT
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| BOTH TRAINS OF RHR (RECIRC CAPABILITY) INOPERABLE FOR APPROXIMATELY SEVEN |
| HOURS |
| |
| "While placing RHR Train 'B' in shutdown cooling during a refueling outage |
| the pump minimum flow valve did not close as expected. Investigation |
| revealed that the mini-flow transmitter 1 FIS-0611 was isolated causing the |
| valve 1 FV0611 to remain open with RHR flow in excess of setpoint that would |
| cause the valve to close. Work was performed on August 29, 2000, to |
| calibrate this transmitter. On September 9, 2000, RHR Train 'A' seal |
| cooler was isolated for maintenance rendering both trains of RHR inoperable |
| for 6 hours and 54 minutes. The Cold leg injection capability from RHR |
| Train 'A' remained available during this time. The Cold leg recirculation |
| capability during these inoperabilities was not available. This would have |
| required entry into T. S. 3.0.3. |
| |
| "RHR Train 'B' mini-flow transmitter 1FIS-0611 was discovered isolated |
| causing the valve 1FV0611 to remain open with RHR flow in excess of setpoint |
| that would cause the valve to close. The transmitter has been returned to |
| service and the valve 1 FV0611 is operating properly." |
| |
| The licensee notified the NRC resident inspector. |
| |
| * * * RETRACTED AT 1524 EDT ON 10/11/00 BY BILL DUNN TO FANGIE JONES * * * |
| |
| "This retracts the 9-18-2000 notification made per 10 CFR 50.72 |
| (b)(2)(iii)(D). That notification described an event where both trains of |
| RHR were inoperable for 6 hours and 54 minutes when one train was in a |
| system outage and the inservice train was found to be inoperable. Full flow |
| to the RCS cold legs was apparently not available because it was determined |
| that the inservice train's miniflow line valve would not close had a design |
| basis accident occurred. Design engineering reviews have revealed that, with |
| the mini-flow valve open, the inservice RHR train remained capable of |
| providing minimum flow to the RCS for analyzed accident scenarios. |
| Therefore, because one train of RHR remained operable, a condition did not |
| exist that would have prevented the fulfillment of a safety function needed |
| to mitigate the consequences of an accident." |
| |
| The licensee notified the NRC Resident Inspector. The R2DO (Ken Barr) has |
| been notified. |
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|Fuel Cycle Facility |Event Number: 37422 |
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| FACILITY: GLOBAL NUCLEAR FUEL - AMERICAS |NOTIFICATION DATE: 10/11/2000|
| RXTYPE: URANIUM FUEL FABRICATION |NOTIFICATION TIME: 16:12[EDT]|
| COMMENTS: LEU CONVERSION (UF6 TO UO2) |EVENT DATE: 10/10/2000|
| LEU FABRICATION |EVENT TIME: 17:00[EDT]|
| LWR COMMERICAL FUEL |LAST UPDATE DATE: 10/11/2000|
| CITY: WILMINGTON REGION: 2 +-----------------------------+
| COUNTY: NEW HANOVER STATE: NC |PERSON ORGANIZATION |
|LICENSE#: SNM-1097 AGREEMENT: Y |KEN BARR R2 |
| DOCKET: 07001113 |PATRICIA HOLAHAN NMSS |
+------------------------------------------------+ |
| NRC NOTIFIED BY: LON PAULSON | |
| HQ OPS OFFICER: FANGIE JONES | |
+------------------------------------------------+ |
|EMERGENCY CLASS: N/A | |
|10 CFR SECTION: | |
|NBNL RESPONSE-BULLETIN | |
| | |
| | |
| | |
| | |
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EVENT TEXT
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| 24-HOUR NRC BULLETIN 91-01 REPORT |
| |
| "At approximately 1700 hours on October 10, 2000 GNF-A Operations determined |
| that one of two controls established for moderation control on material feed |
| to a process area located within an Moderation Restricted Area (MRA) had |
| been lost. The controls require two samples that verify acceptable moisture |
| content for the feed material. One of two required moisture samples was not |
| analyzed due to an inadvertent purge of the moisture sample request from the |
| IMR (In-process Material Release) database, and the material was improperly |
| released for processing. |
| |
| "The second independent moisture sample was performed and confirmed the |
| measured moisture content was satisfactory, therefore no unsafe condition |
| existed. |
| |
| "This event is reported pursuant to NRC Bulletin 91-01 (within 24 hours) due |
| to loss of a single control on moderation. Material can feed to affected |
| moderation restricted area (MRA) of process have been suspended pending |
| investigation and implementation of corrective actions. |
| |
| "SAFETY SIGNIFICANCE OF EVENTS: Low safety significance - independent |
| control on moderation remained intact; material met moisture |
| specifications. |
| |
| "POTENTIAL CRITICALITY PATHWAYS INVOLVED: Multiple failure modes required |
| before a criticality accident could occur. |
| |
| "CONTROLLED PARAMETER(S) (MASS, MODERATION , GEOMETRY, CONCENTRATION, |
| ETC.): Moderation: Process equipment limited to uniform moisture content |
| of 10.5 wt. % (105,000 ppm H2O). Moderation Safety Factor = safety |
| moderation limit / process moderation limit = 105,000 / 4000 = 26.2. |
| |
| "ESTIMATED AMOUNT, ENRICHMENT, FORM OF LICENSED MATERIAL (INCLUDE PROCESS |
| LIMIT AND % WORST BASE CRITICAL MASS): Affected equipment contained |
| approximately 100 kgs of UO2 and gadolinia (Gd2O3) at a target enrichment of |
| ~4.40 wt. % U235. The vibromill blender process equipment is located in the |
| moderation-restricted area, which is demonstrated safe for uniform |
| moderation limit of 10.5 % water equivalent moderation (105,000 ppm H2O). |
| |
| "NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEM(S) AND DESCRIPTION |
| OF THE FAILURES OR DEFICIENCIES: One of two required moisture samples was |
| not analyzed due to an inadvertent purge of the moisture sample request from |
| the IMR (In-process Material Release) database, and the material was |
| improperly released for processing in the gad shop MRA. |
| |
| "CORRECTIVE ACTIONS TO RESTORE SAFETY SYSTEMS AND WHEN EACH WAS IMPLEMENTED: |
| 1. Feed material re-sampled for moisture content - results satisfactory |
| (<4000 ppm H2O). 2. Suspended material can feed to the affected process |
| area. 3. Investigation and implementation of corrective actions pending." |
| |
| The licensee intends to notify the NRC Region 2 (David Ayres), the New |
| Hanover County and North Carolina State agencies of this event. |
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