Event Notification Report for April 3, 2001
U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/02/2001 - 04/03/2001 ** EVENT NUMBERS ** 37879 37880 37882 +------------------------------------------------------------------------------+ |Fuel Cycle Facility |Event Number: 37879 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | FACILITY: PADUCAH GASEOUS DIFFUSION PLANT |NOTIFICATION DATE: 04/02/2001| | RXTYPE: URANIUM ENRICHMENT FACILITY |NOTIFICATION TIME: 03:42[EDT]| | COMMENTS: 2 DEMOCRACY CENTER |EVENT DATE: 04/01/2001| | 6903 ROCKLEDGE DRIVE |EVENT TIME: 01:45[CST]| | BETHESDA, MD 20817 (301)564-3200 |LAST UPDATE DATE: 04/02/2001| | CITY: PADUCAH REGION: 3 +-----------------------------+ | COUNTY: McCRACKEN STATE: KY |PERSON ORGANIZATION | |LICENSE#: GDP-1 AGREEMENT: Y |MICHAEL JORDAN R3 | | DOCKET: 0707001 |PATRICIA HOLAHAN NMSS | +------------------------------------------------+ | | NRC NOTIFIED BY: W. F. CAGE | | | HQ OPS OFFICER: JOHN MacKINNON | | +------------------------------------------------+ | |EMERGENCY CLASS: N/A | | |10 CFR SECTION: | | |NBNL RESPONSE-BULLETIN | | | | | | | | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | NRC BULLETIN 91-01, 24 HOUR NOTIFICATION INVOLVING REFRIGERANT-114 (R-114) | | NOT IMMEDIATELY SAMPLED TO DETERMINE MOISTURE CONTENT | | | | On 03/31/01, R-114 was transferred from a rail car to the C-335 R-114 drain | | tank. Following the transfer from the rail car it was determined that the | | C-335 R-114 drain tank was over the desired fill level and the decision was | | made to transfer the R-114 from the drain tank to C-335 Unit 4 Cell 9 R-114 | | system. The R-114 transfer to C-335 Unit 4 Cell 9 from the C-335 drain tank | | was completed at 1740 CST on 03/31/01. Following the 1900 shift change on | | 03/31/01 the C-335 building personnel questioned if the R-114 in C-335 Unit | | 4 Cell 9 should be sampled for moisture. A review of the independent assay | | verification for C-335 Unit 4 Cell 9 revealed the assay was greater than 1 | | wt% U235 assay and at 0145 CST on 04/01/01 it was determined that moisture | | sampling was required and the Plant Shift Superintendent was notified. NCSA | | CAS-011 requires that if R-114 is transferred to a cell that is above | | 1wt%U235 assay, the R-114 in the cell must be immediately sampled to | | determine the moisture content. Since the time between the transfer of the | | R-114 to the cell and the actual sampling was determined to not meet the | | NCSA requirement of immediate sampling and is therefore an NCS violation. | | | | SAFETY SIGNIFICANCE OF THE EVENT: | | | | Although a time limit to determine moisture is not possible, the control | | requires sampling to start immediately as defined in the TSR. Sampling was | | delayed in violation of the control procedure. | | | | POTENTIAL CRITICALITY PATHWAYS INVOLVED: | | | | In order for criticality to be possible, the following sequence must occur: | | Wet R-114 must leak into the process gas portion of the system which | | contains a larger that critical mass fissile deposit. Sufficient time to | | enable the hydrogen of the deposit must pass and the deposit must be in a | | critical geometry for criticality to be possible. | | | | CONTROLLED PARAMETERS (MASS, MODERATION, GEOMETRY, CONCENTRATION, ETC.): | | | | Double contingency for this scenario is established by implementing two | | controls on moderation. | | | | ESTIMATED AMOUNT, ENRICHMENT, FORM OF LICENSED MATERIAL (INCLUDE PROCESS AND | | % CASE CRITICAL MASS): | | | | 1.5185 wt%U235 | | | | NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEM(S) AND DESCRIPTION | | OF THE FAILURES OR DEFICIENCIES: | | | | The first leg of double contingency is based on immediately sampling of | | R-114 for water content. Actual moisture content was within acceptable | | specifications but the sample was not taken in accordance with the time | | requirement for control. Specifically the control requires immediate | | sampling upon completion of the addition of R-114. | | | | CORRECTIVE ACTIONS TO RESTORE SAFETY SYSTEMS AND WHEN EACH WAS IMPLEMENTED: | | | | | | The R-114 was sampled at 0300 on 04/1/01 with the moisture level determined | | to be within specifications. | | | | The NRC Resident Inspector was notified of this event by the Certificate | | Holder. | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ |Power Reactor |Event Number: 37880 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | FACILITY: COMANCHE PEAK REGION: 4 |NOTIFICATION DATE: 04/02/2001| | UNIT: [1] [] [] STATE: TX |NOTIFICATION TIME: 06:53[EDT]| | RXTYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/02/2001| +------------------------------------------------+EVENT TIME: 04:02[CST]| | NRC NOTIFIED BY: BEAUDIN |LAST UPDATE DATE: 04/02/2001| | HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+ +------------------------------------------------+PERSON ORGANIZATION | |EMERGENCY CLASS: N/A |DAVE LOVELESS R4 | |10 CFR SECTION: | | |*DEG 50.72(b)(3)(ii)(A) DEGRAD COND DURING OP | | | | | | | | | | | +-----+----------+-------+--------+-----------------+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ |1 N N 0 Refueling |0 Refueling | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | GREATER THAN 1 PERCENT OF STEAM GENERATOR # 3 TUBES FOUND TO BE POTENTIALLY | | DEGRADED. | | | | At approximately 0402 CT on 04/02/01, Comanche Peak discovered that more | | than 1% (52 out of 4772 tubes) of the inspected tubes in Steam Generator # 3 | | are potentially degraded. The degraded tubes are being evaluated to be | | removed from service. This event meets the criteria of C-3 as described in | | their Technical Specification section 5.5.9. Additional data is being | | collected and will be analyzed to assist in determining the cause of the | | event. An LER will be issued to further document this issue. The other | | three Steam Generator tubes are being inspected. | | | | The NRC Resident Inspector will be notified of this event by the licensee. | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ |Power Reactor |Event Number: 37882 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | FACILITY: SAINT LUCIE REGION: 2 |NOTIFICATION DATE: 04/02/2001| | UNIT: [1] [] [] STATE: FL |NOTIFICATION TIME: 17:35[EDT]| | RXTYPE: [1] CE,[2] CE |EVENT DATE: 04/02/2001| +------------------------------------------------+EVENT TIME: 17:10[EDT]| | NRC NOTIFIED BY: DAVE WILLIAMS |LAST UPDATE DATE: 04/02/2001| | HQ OPS OFFICER: FANGIE JONES +-----------------------------+ +------------------------------------------------+PERSON ORGANIZATION | |EMERGENCY CLASS: UNU |EDWARD MCALPINE R2 | |10 CFR SECTION: |JOHN ZWOLINSKI NRR | |*AEC 50.72(a) (1) (i) EMERGENCY DECLARED |RICHARD WESSMAN IRO | | |AUSTIN FEMA | | | | | | | +-----+----------+-------+--------+-----------------+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ |1 N N 0 Hot Shutdown |0 Hot Shutdown | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR COOLANT SYSTEM LEAKAGE >10 GPM AS OBSERVED FROM CONTROL ROOM | | INDICATIONS | | | | The licensee was in the process of placing the '1A' train of shutdown | | cooling system in service, when relief valve V-3483 lifted. Opening V-3481, | | shutdown cooling hotleg suction valve, caused pressurizer level to decrease | | about 4% in 5 minutes which corresponds to about 80 gpm. The leak was | | terminated when V-3481 was closed. The Unusual Event was declared and | | terminated at 1710 EDT when the leak was isolated. | | | | The licensee intends to notify the NRC Resident Inspector and has notified | | the State of Florida. | +------------------------------------------------------------------------------+
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Page Last Reviewed/Updated Thursday, March 25, 2021