United States Nuclear Regulatory Commission - Protecting People and the Environment

Power Reactor Event Number: 38099
FACILITY: PERRY REGION: 3 NOTIFICATION DATE: 06/27/2001
UNIT: [1] STATE: OH NOTIFICATION TIME: 13:39[EDT]
RXTYPE: [1] GE-6    EVENT DATE: 06/27/2001
      EVENT TIME: 11:30[EDT]
NRC NOTIFIED BY: BRIAN STETSON LAST UPDATE DATE: 06/27/2001
HQ OPS OFFICER: DOUG WEAVER      
      PERSON ORGANIZATION
EMERGENCY CLASS: NON EMERGENCY GEOFFREY WRIGHT R3
10 CFR SECTION:    JOHN TAPPERT NRR
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

EVENT TEXT

OSCILLATION POWER RANGE MONITOR SCRAM SETPOINTS ARE NON-CONSERVATIVE

"The Plant Staff was notified by General Electric (GE) via a BWR Owners Group conference call today at approximately 1130 that the Oscillation Power Range Monitor (OPRM) instrumentation SCRAM setpoints are non-conservative due to a non-conservative GE analysis. The OPRM instrumentation is an input to the Reactor Protection System. The OPRM instrument is relied on for providing a safe shutdown safety function when operating during an unstable power to flow condition. The OPRM Instrumentation equipment is therefore considered inoperable and is reportable to the NRC law 10CFR 50.72(b)(3)(v)(A), as a condition that at the time of discovery could have prevented the fulfillment of the safety function of a system needed to shutdown the reactor and maintain it in a safe shutdown condition.

"The plant is currently operating within its Technical Specifications 3.3.1.3 Required Action with Off-Normal Instruction (NO C51) procedure as an alternate method to monitor and suppress thermal hydraulic instability. GE is currently issuing a 10 CFR Part 21 Interim Report and Transfer of Information to formally notify licensees with an evaluation pending."

The licensee notified the NRC resident inspector.

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