ML20055E822

Part 21 Rept Re Abb 27/59 Relays Deteriorated Due to Thermal Stress.Initially Reported on 900222.Units W/Listed Identification Numbers to Be Inspected & Replaced If Signs of Overheating Present

ML20055E822
Person / Time
Site:	Beaver Valley
Issue date:	07/05/1990
From:	Rhoad E ABB POWER DISTRIBUTION, INC.
To:	Berlinger C Office of Nuclear Reactor Regulation
References
REF-PT21-90 NUDOCS 9007120377
Download: ML20055E822 (3)

Text

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ASL A BROWN DOVEHi July 5. 1990 Mr. Carl Berlinger, Branch Chief Office of Generic Communications U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

10CFR Part 21 Report ABB 27/59 Relays Gentlemen:

This is a follow-up report to a Part 21 report sent to the NRC dated February 22, 1990 on the ABB 27/59 relays, wherein the solder connections from the wire wound resistors connecting to the printed wiring runs on the bottom of the circuit boards have deteriorated due to thermal stress.

In inspecting for the problem previously reported on the ABB 27/59 relay, Duquesne Light (Beaver Valley) discovered a similar problem with some of the Type 47 relays.

An ABB 47H relay, Catalog Number 211F0171 was returned for evaluation and it was determined that a similar problem existed.

Upon examination of the records, it was determined that types 47, 47D and 47H rela /s manufactured f rom March 1976 through late 1978 could be of this design. These units have catalog numbers 211F XXXX or 211N XXXX (where "X" is any digit).

Circuit boards with small solder pads for the wire wound power resistor lead connections are identified by one of the following numbers printed on the circuit board:

609928-001 609928-002 609928-003 Units with the above numbers should be replaced with new relays.

Units using circuit boards with the following identification numbers should be inspected and replaced if signs of overheating are present.

These circuit boards have increased solder pad sizes, compared to the above listed units, however they are not up to the present design standards:

610364-001 610364-002 610310-002 610310-001 610310-003 g8Q71j@$l[$SS 4 ABB Power Distribution Inc. [

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ABB Power DistrtDUten Inc Telephone Teletax

/ 4OfQ 79 u y ll Road 215 822-4270 215 822 4271

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l Mr. Carl Berlinger. Branch Chief Office of Generic Communications July 5, 1990 Page 2 A list of ABB Type 47, 47D or 47H in nuclear applications with possible solder pad overheating problems is attached as Appendix "A". Copies of this report are being sent to Duquesne Light Company (Beaver Valley) and to TVA (Bellefonte).

Q. b E. W. Rhoads Manager. Quality Assurance ,,

EWR/jm I

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A_B_B v

APPENDIX "A" TYPE ABB (ITE) 47, 47D, OR 47H RELAYS IN NUCLEAR APPLICATIONS WITH POSSIBLE SOLDER-PAD OVERHEATING PROBLEM The following relays may NOT all be Class lEt 1

Duquesne Light Company - Beaver Valley Plantt The following relays were shipped mostly for S.O. 33-50661 (but possibly I on 50438, 50766):

Most of these shipments took place August 78 through October 78: l 34-27984 (4) 211N0171, (2) 211N6171 34-27883 (2) 211N0271, (2) 211N6171, (4) 211N0171, (2) 211N4171 )

l 34-27881 (4) 211N4171 34-27880 (16) 211N0171 34-26918A (2) 211N6171, (4) 211N4171 Two Units were supplied to Systems Control Co. for Duquesne Light Beaver Valleyt 34-33354 (2) 211N0171 1 TVA (Bellefonte)

The following relays were shipped for 33-51014 in June 78:

34-28685 (2) 211F4171 1

NOTE: The relays identified in this report are called ABB relays, however at the time of their manufacture they were identified with the name "ITE". l l

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