ML20203D213
| ML20203D213 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/14/1986 |
| From: | Swanson N NAMCO CONTROLS |
| To: | Zech G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-86 NUDOCS 8607210174 | |
| Download: ML20203D213 (3) | |
Text
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Namco Controls 7567 Tyler Boulevird Mentor, Ohio 44060 (216) 946-9900 Telex 24-1566 hU secausenorrungesse o,*seerrec j
July 14, 1986 Mr. Gary Zech Chief - Vendor Program U. S. Nuclear Regulator Commission Washington, D.C.
20555
Subject:
Notification of a possible product defect as required by 10CFR21.
Namco part #EA188-30007 Contact Lever Assembly for Series EA180 Limit Switches
Dear Mr. Zech:
We have been advised by Stone & Webster Engineering Corporation that their inspectors at Niagara Mohawk's Nine Mile Point have found cracks in plastic contact lever arms in 14 qualified Namco EA180 limit switches.
We have ob-tained samples of these parts from the plant, and examined them on July 11, 1986.
(See a copy of our drawing enclosed.)
The parts returned to us were taken from switches manufactured in 1979, accord-ing to the date code on the exterior of the switch housing. This is the first report of this condition that we have received from a field installation, and our records show that we have shipped over 40,000 EA180 switches in the last 10 years.
Inasmuch as we do not know whether the cracked condition could lead to fracture and subsequent switch failure, we are proceeding as follows:
1.
Proposing to Niagara Mohawk that they replace contact lever arms in all Category I safety-related limit switches with new lever arms, which we will provide.
2.
Initiating-a test program of switches with cracked lever arms returned from Nine Mile Point to determine if the cracks even-tually cause switch failure, and if so, after how many normal operations.
3.
Reviewing the specified plastic materials and production pro-cesses involved with these lever arms, to insure that the con-dition does not recur.
M k
0 AN ACME CLEWL AND COMeuNY
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U. S. huclear Regulatory Commission July 14, 1986 Pending the outcome of our life testing in #2 above, we will advise the NRC and our utility customers what action we recommend be taken to insure that this problem is properly corrected, if corrective action is required.
1 Ver tru
- yours, r
enc N. E. Swanson President NAMCO CONTROLS NES/kg
- Attach, cc: E. L. Laskowski E. L. Roob C. E. Crocker, Stone & Webster Engrg. Corp.
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