ML040750184

Slide Presentation by Duke Energy Corp. Regarding Reactor Trip Breaker Replacement

ML040750184
Person / Time
Site:	Oconee
Issue date:	03/08/2004
From:	Duke Energy Corp
To:	Office of Nuclear Reactor Regulation
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ML040720190	List: ML040750184
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Download: ML040750184 (12)

Text

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4-REACTOR TRIP BREA KER REPLA CEMENT Oconee Nuclear Station March 8, 2004

Duke Energ Ag~endia

• Introductions

• 10CFR 50.59 Application

• CRD Related Modifications

• RTB Interfaces

• . RTB replacement

• Technical Specification Change

• Closing Remarks 2

WDuke wn ergy 10 CFR 50.59 Application

• Oconee is undergoing extensive refurbishment to address equipment age and obsolescence issues

• CRDCS Upgrade is scheduled for implementation during the 3EOC21 RFO which begins October 7, 2004

• The 10CFR 50.59 rule is applied to all Oconee changes. RG 1.187 endorses NEI 96-07 which provides guidance in implementing the rule

• Section 4.1.1 of NEI 96-07, Rev. 1 clarifies that aspects of proposed activities that require a TS change must be made via the license amendment process, while the 50.59 process should be applied to the balance of the modification

• • The aspects of this modification (RTB replacement) directly related to the TS change were submitted to the NRC for review 3

Duke CRD RELA TED Energy MODIFICA TIONS SEENEENINOW- _7 __ __- - - - - . .. z ,

• • CRDM replacement

• RTB

• • DCRDCS

- RPS

• CRD In-Containment Cables

• • CRD Reactor Building Penetrations 4

iDuke TEnergy RTB INTERFACES

• . Non safety-related

• CRDCS

• Main Turbine Trip

• Generator Trip

• Main Steam Stop Valves

• RPS shunt trip

• • Safety-related

• RPS undervoltage trip 5

Duke Energy RTB REPLACEMENT

• • Existing configuration

• k New configuration

• .*Why change is acceptable

• &New RTB configuration similar to what is installed at later vintage B&W plants 6

kDuke EXISTING RTB CONFIGURATION

!Energy A Power B Power Supply Reactor Trip Switch Supply 7

kDuke

!Energy NEW RTB CONFIGURATION A Power B Power Supply Reacitor Trio Switch Supply A _ - - RPS A RPS B IF - --

B I I I

I C - - - RPS C RPS D _4D-4_ - _ D 600 VAC, 30 120 VAC, 60 120 VAC, 60 Control Control I I 8

uke Methods for Dropping

-nergy Control Rods

• . RPS Manual Trip

• .*RPS Automatic Trip

• • Diverse Scram System Trip

• • Source Interrupt Trip 9

Duke TECH SPECS FOR Energy CURRENT CONFIGURATION

• VLCO requires the following to be OPERABLE:

71 Two AC CRD trip breakers 71 Four DC CRD trip breakers; 71 Eight electronic trip assembly (ETA) relays 10

Duke PROPOSED TECH SPECS FOR energy NEW CONFIGURATION

• LCO requires four AC CRD trip breakers to be OPERABLE

• &ACTION required when LCO not met are the same as existing requirements for AC CRD trip breakers

• Eliminated requirements for non safety related ETA relay requirements

• • Eliminated requirements for DC CRD trip breakers 11

Duke 0Energy

• ,*Closing Remarks 12