Part 21 Report - 2001-233
Power Reactor | Event Number: | 38119 | |||||
FACILITY: FERMI | REGION: 3 | NOTIFICATION DATE: | 07/05/2001 | ||||
UNIT: [ 2 ] [ ] [ ] | STATE: MI | NOTIFICATION TIME: | 16:03[EDT] | ||||
RXTYPE: [2] GE-4 | EVENT DATE: | 07/05/2001 | |||||
EVENT TIME: | 10:00[EDT] | ||||||
NRC NOTIFIED BY: | COSEI | LAST UPDATE DATE: | 07/05/2001 | ||||
HQ OPS OFFICER: | CHAUNCEY GOULD | ||||||
PERSON | ORGANIZATION | ||||||
EMERGENCY CLASS: | NON EMERGENCY | ROGER LANKSBURY | R3 | ||||
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 | |
2 | N | Y | 100 | Power Operation | 100 | Power Operation | |
EVENT TEXT |
NON-CONSERVATIVE ANALYSIS FOR OPRM SCRAM SETPOINTS
On July 5, 2001, Detroit Edison received confirmation from General Electric of a non-conservative analysis that supports Operation Power Range Monitor (OPRM) scram setpoints. The non-conservative analysis is generic and been determined to affect Fermi 2. The OPRM had been conservatively declared inoperable on June 27, 2001, at 1333 hours as a result of preliminary notification by General Electric.
The consequences of the non-conservative analysis are that the associated OPRM Reactor Protective System (RPS) scram setpoints are non-conservative. The non-conservative RPS setpoints may result in violating the Minimum Critical Power Ratio (MCPR) safety limit during a thermal-hydraulic instability.
All OPRM channels have been declared inoperable. Technical Specification 3.3.1.1 Action J requires an alternate method of detecting and suppressing thermal-hydraulic instabilities to be implemented within 12 hours. Alternate methods have been established, thus, the Technical Specification required action is satisfied. Fermi 2 has 120 days to restore the OPRMs to an operable condition.
This initial report is being made in accordance with 10CFR50.72 (B)(3)(V)(A) as a condition that could have prevented the fulfillment of the safety function of a system needed to shutdown the reactor.
See EN #38104, GE Nuclear Energy 10CFR21 report.
The NRC Resident Inspector will be notified.
Page Last Reviewed/Updated Thursday, March 25, 2021
Page Last Reviewed/Updated Thursday, March 25, 2021