Event Notification Report for July 30, 2001
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
07/27/2001 - 07/30/2001
** EVENT NUMBERS **
38139
!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!!
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|Power Reactor |Event Number: 38139 |
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| FACILITY: PILGRIM REGION: 1 |NOTIFICATION DATE: 07/13/2001|
| UNIT: [1] [] [] STATE: MA |NOTIFICATION TIME: 14:52[EDT]|
| RXTYPE: [1] GE-3 |EVENT DATE: 07/13/2001|
+------------------------------------------------+EVENT TIME: 08:55[EDT]|
| NRC NOTIFIED BY: JOHN MacDONALD |LAST UPDATE DATE: 07/27/2001|
| HQ OPS OFFICER: STEVE SANDIN +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: NON EMERGENCY |ANTHONY DIMITRIADIS R1 |
|10 CFR SECTION: | |
|AINA 50.72(b)(3)(v)(A) POT UNABLE TO SAFE SD | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N Y 100 Power Operation |100 Power Operation |
| | |
| | |
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EVENT TEXT
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| APRM FLOW-BIASED SCRAM SETPOINTS SET NONCONSERVATIVELY |
| |
| "On July 13, 2001 at 0855 hrs, with the reactor at 100% core thermal power, |
| Pilgrim Station determined the Average Power Range Monitoring (APRM) system |
| flow-biased reactor scram setpoints were non-conservative and potentially |
| exceeded Core Operating Limit Report (COLR) analyses. Programmed Flow |
| Control Trip Reference (FCTR) cards establish the APRM flow-biased scram |
| setpoints. The FCTR cards are a plant enhancement in response to the BWR |
| stability issue. During core flow mapping for FCTR card calibration in |
| accordance with station procedure (9.17.1), it was determined by reactor |
| engineering personnel that the input setting for the FCTR card DIP switches |
| was non-conservative. In response to this event, the APRMs were declared |
| inoperable and Technical Specification 3.1 and the Actions of Table 3.1.1 |
| were initiated. TS Table 3.1.1 requires that reactor trip capability for the |
| given trip function be restored within 1 hour or initiate insertion of |
| operable control rods and complete insertion of all operable control rods |
| within 4 hours. However, Instrumentation and Controls personnel completed |
| FCTR card DIP switch adjustments in accordance with station procedure |
| (3.M.2-5.4.s) within approximately 45 minutes. All APRM RPS functions were |
| declared operable at 0946 hours and TS 3.1 was exited. The reactor remained |
| at 100% core thermal power throughout the event and there were no plant |
| transients as a result of the event. |
| |
| "The cause of the event appears to [be] a lack of administrative controls to |
| ensure the FCTR card flow mapping be performed when steady-state 100% core |
| thermal power is achieved following refueling outages or significant power |
| maneuvers." |
| |
| The licensee informed the NRC resident inspector and will inform the |
| Commonwealth of Massachusetts. |
| |
| * * * UPDATE AT 1221EDT ON 7/27/01 FROM OLSON TO S. SANDIN * * * |
| |
| The licensee is retracting this report based on the following: |
| |
| "Pilgrim Station retracts a report made to the NRC Operations Center on July |
| 13, 2001 at 1500 hours. The Event Number was 38139. The report was made |
| pursuant to 10 CFR 50.72(b)(3)(v)(A) when it was determined the Average |
| Power Range Monitoring (APRM) system flow-biased reactor scram setpoints |
| were set non-conservatively. |
| |
| "Subsequent testing has determined that the setpoints were set |
| conservatively and that the APRM flow-biased reactor scram was operable. |
| Therefore, no situation existed which was reportable pursuant 10 CFR |
| 50.72(b)(3)(v)(A). |
| |
| "The NRC resident inspector has been informed of this retraction." |
| Notified R1DO(White). |
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Page Last Reviewed/Updated Thursday, March 25, 2021
Page Last Reviewed/Updated Thursday, March 25, 2021