ML18153C101

Part 21 Rept Re Two of Three Pc Cards in GE Type SLV11A1 Over/Undervoltage Relays Failing to Produce Output.Short Between Leads Would Result in Damage to Component 1C5. Sketch of Threshold Detection Board Encl

ML18153C101
Person / Time
Site:	Surry, North Anna, 05000000
Issue date:	02/02/1990
From:	TEAGUE J E GENERAL ELECTRIC CO.
To:	MURLEY T E Office of Nuclear Reactor Regulation
References
REF-PT21-90, REF-PT21-90-019-000 PT21-90-019-000, PT21-90-19, NUDOCS 9002120066
Download: ML18153C101 (3)

Text

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• GE Meter & Control General Electric Company 205 Great Valley Parkway, Malvern, PA 19355-0715 Dial Comm: FEBRUARY 2, 1990 DR. THOMAS E. MURLEY DIRECTOR, OFFICE OF NUCLEAR REACTOR REGULATION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, DC 20555

SUBJECT:

TYPE SLV11Al OVER/UNDER VOLTAGE RELAY DEAR DR. MURLEY: THIS LETTER IS TO NOTIFY YOUR OFFICE 'OF A POTENTIALLY REPORTABLE CONDITION PURSUANT TO 10CFR21. WE ARE CONCERNED ABOUT A CONDITION IN WHICH THE SLV11A OVER/UNDER VOLTAGE RELAY WOULD FAIL TO OPERATE. WE LEARNED OF THIS CONDITION AFTER COMPLETING AN INVESTIGATION INTO A DEFECTIVE RELAY RETURNED FROM ONE USER. TECHNICAL DETAILS ARE CONTAINED IN THE ATTACHED LETTER WHICH IS BEING SENT TO ALL PURCHASERS ON RECORD WHO PURCHASED THE RELAY FOR 1E USE .. A SIMILAR LETTER IS BEING SENT TO OUR GENERAL MAILING LIST OF CUSTOMERS.

THIS RELAY HAS LITTLE USE IN lE APPLICATION.

TWO CUSTOMERS, VIRGINIA POWER AND GE-SAN JOSE HAVE PURCHASED IT FOR lE USE. SINCERELY YOURS, L-7 J--1 'th71-& z; __;~ /,V, SE. TEAGUE MANAGER, PRODUCT ENGINEERING ATTACHMENT:

CUSTOMER LETTER cc: T.E. MORLEY (NRC) 2 E.W. BRACH (NRC) C.H. BERLINGER (NRC) W.T. RUSSELL (NRC) C.E. ROSSI (NRC) I ---J '=)(:I()::;,:;~-.~)-:.-

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• GE Meter & Control General Electric Company 205 Great Valley Parkway, Malvern, PA 19355-0715 February 2, 1990 (Customer name) (address)

Dial Comm:

Subject:

GE Type SLV11A Relays Gentlemen:

our records indicate that you have purchased Type SLV11A Voltage Relays for Nuclear lE application on the purchase orders shown on the attached list. This letter is to notify you of a potentially reportable condition pursuant to 10CFR21. We have just completed an inv~stigation into a field failure report of an SLV11A relay. This is a three phase over/under voltage relay containing separate threshold detection cards for each phase. The field report indicated that two of the three PC cards failed to produce an output. our lab evaluation of the returned relay indicated that component res was defective on each PC card that had failed to produce an output. on each PC card with a defective res we also found the exposed lead of capacitor C12 was touching the exposed lead of resistor R29. A short between these component leads will result in damage to component IC5, preventing a relay output from the associated phase. A review of the layout of the card indicated that C12 and R29 are adjacent to a user selection link identified as the count select.

It is possible that C12 can be accidently pushed into contact with R29 during placement of the count select jumper. Relays in the field may be inspected for clearance between C12 and R29. Figure 1, attached, shows the location of these components on the threshold detection board. Functional performance of the relay may be verified using the procedure in the testing section of the SLV11A instruction book, GEK-65535.

Users may determine from their application of the relay if a safety hazard could be created by the condition described above. Sincerely yours, ,~~Te!-!lfaf~

Manager, Product Engineering

Attachment:

Figure 1 P.O. list 7,

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• ATTACHMENT TO GE LETTER DATED FEBRUARY 2,1'990

SUBJECT:

SLVllA STATIC OVER/UNDER VOLTAGE RELAY Possible point of contact. 0 0 0 0 THRESHOLD DETECTION BOARD D D D count Cl R29 D O D O q>d> 0 D 0 ICS C12 D 0 Count select jumper FIGURE 1