ML19325E727

Part 21 Rept Re Defect in Eight GE Type CR 2940 Control Switches at Plant.Initial Condition Found on 890930.Contacts 3 & 4 for All Switches in Plant Sys Verified to Be in Correct Position for Intended Application

ML19325E727
Person / Time
Site:	River Bend
Issue date:	10/20/1989
From:	Deddens J GULF STATES UTILITIES CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-89, REF-PT21-89-191-000 PT21-89-191, PT21-89-191-000, RBG-31655, NUDOCS 8911080350
Download: ML19325E727 (3)

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OVLF STATER VTELETIES COMPANY Alvt A SIN 0 5f AttON POST Of fici tC A 220 51 f AAAC:5vitti L0utsiAha 70775 ARE A C0De l04 63040,4 446 8661 1

October 20, 1989 RBG- 31655 File Nos. G9.5, G9.25.1.2 t '

U. S. Nuclear Regulatory Comission Region IV '

.611 Ryan Plaza Drive, Suite 1000 '

Arlington, TX 76011 '

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Gentlemen: '

River Bend Station - Unit 1 Docket No. 50-458 Pursuant to the requirements of 10CFR21.21(b)(2) Gulf States Utilities Company (GSU).is submitting this written report of a defect in a General Electric Type CR 2940 control switch at River Bend Station. The attached report provides the information required by 10CFR21.21. i 1 Si cerely, N

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J. C. Deddens [

1: Senior Vice President River Bend Nuclear Group i

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Attachment 4 l cc: Office of Nuclear Reactor Regulation '

L U. S. Nuclear Regulatory Comission Washington, D.C. 20555 NRC Resident Inspector Post Office Box 1051 St. Francisv111e, LA 70775 Mr. John E. Dale f6fi Nuclear Services Manager , g General Electric Company 4324 South Sherwood Forest Boulevard Baton Rouge, LA 70816 8911080350 891020 PDR ADOCK 05000458 8 PNV

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Gulf States Utilities Company  !

River Bend Station - Unit 1 Report of a Defect Per 10CFR21 4 General Electric Type CR 2940 Control Switch  !

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1. Name and address of individual (s) infonning the NRC.

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Written notification is provided by this report from Mr. J. C. Deddens.

Senior Vice President Gulf States Utilities Company.

Address: Gulf States Utilities Post Office Box 220 '

St. Francisville, LA 70775

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2. Identification of the facility, the activity, or the Basic' Component supplied for the facility or activity which fails to comply or contains a Defect.

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The defect was sprotection found(RPS) system in a econtrol trip channel switch' used in theBend at River UnitStation

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L 3. Identification of the firm constructing or supplying the Basic Component '

which fails to comply or contains a Defect.

Thecontrolswitch(TipeCR2940PartNo.'145C3040P022)was supplied by .;

4eneral Electric Company.

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4. Nature of the Defect or failure to comply and the safety hazard which is created by the Defect or failure to comply, i A General Electric Type CR2940 control switch, part No. 145C3040P022 was

( found with the key slot of the switch operator indicating normal (mid)

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position. When in the normal position, contacts'3 and 4 are designedTto l 4be maintained in the closed position. ' Contrary to this requirement, contacts 3 and 4 were found to be open. This' condition was found in the "D" reactor protection system (RPS) trip channel. The condition of the

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switch contacts caused a reactor scram while testing the "C" RPS trip ,

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channel.

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(fka In addition to the original conoition, twenty-three spare switches of the ,

same type were tested. The test found that the switch is capable of failing such that the Aey may .be removed prior to contacts 3 and 4 closing in the normal position. [ Eight failures of this type were

identified from this test. _.

l Control sui (ches having part No. 145C3040P022 are installed in

, twenty-four safety related applications. The switches are installed in the reactor protection system (RPS)andtheautomaticdepressurization Page 1 of 2 l

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'. systemIAS). Failure of the switches in RPS would' place the system in a

conservative ' state. However, ADS utilizes contacts 3 and 4 in the control. logic needed for actuation of the pressure relief and low-low set modes for the safety relief valves (SRVs).

r to close would prevent division II SRV press,A failureand ure relief of contacts low-low 3setand 4'

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ilogic from performing its. safety related function.,

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5. The date on which the information of the Defect or failure to comply was i obtained.

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The initial condition was found on September 30, 1989. Evaluation of the condition per 10CFR21 determined. the condition to be reporfable on October 20, 1989.

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6. In the case of a Basic Component which contains a defect or fails to comply, the number and location of all the components in use at, supplied

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for, or being supplied for one or more facilities or activities subject to the regulations of 10CFR21.

Control switches having part No. 14503040P022 are installed in ,

(twenty-four safetDelated applications at River Bend Station. They are installed "in the reactor system (RPS) and the automatic l depressurization system (ADS)protedion

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[ 7. The corrective action which has been, or will be taken; the name of the l individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action.

Contacts 3 and 4 for all of the subject switches installed in plant systems have been verified to be in the correct position for their intended application. A review was conducted of surveillance procedures that require operation of the subject control switches. With the

• exception of STP-051-0201, "RPS-Main Steam Line Isolation Yalve Closure Monthly CHFUNCT" and STP-202-0602, " ADS Safety Relief Valve Operability l Test", the Applicable procedures contain sufficient controls for  !

verifying proper positioning .of the switch contacts. STP-051-0201 has

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been revised per TCN 89-1130fto include instructions for verifying proper switch contact position'.' STP-202-0602 will be revised prior to its next

' scheduled perfonnance. In arHition, h o 'awitches identified ' as being defective have been sent to GeneraT Electric for failure analysis, sw is performing an inaependent failure ena!ysis on thf. defect 1ve switches.  !

GSU will also notify General Electric Company by copy of this letter.

l i 8. Any advice related to the Defect or failure to comply about the facility, activity, or Basic Component that has been, is being, or will be given to '

purchasers or licensees.

Not applicable.

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