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.