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 THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +------------------------------------------------------------------------------+ |Power Reactor |Event Number: 37338 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | 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 | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | 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. | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ |Fuel Cycle Facility |Event Number: 37422 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | 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 | | | | | | | | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | 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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Page Last Reviewed/Updated Thursday, March 25, 2021