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 '

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

J. C. Deddens [

1: Senior Vice President River Bend Nuclear Group i JCD/ L/ /0WL/ch 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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.y ATTAC M 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.

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

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.

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

1. g,D"Weac 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) 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 switch contacts caused a reactor scram while testing the "C" RPS trip ,

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.,

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

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.

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 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

[ 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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