ML13316A082
| ML13316A082 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point, Seabrook, Haddam Neck, Ginna, San Onofre, Cook  |
| Issue date: | 11/15/1991 |
| From: | Rizvi S Foxboro Corp |
| To: | Berlinger C Office of Nuclear Reactor Regulation |
| References | |
| REF-PT21-91 NUDOCS 9201020017 | |
| Download: ML13316A082 (3) | |
Text
The Foxboro Company Foxboro, MA U.S.A.
02035-2099 Telephone: 508-543-8750 Telex: 927-602 or MCI-6817560 Fax: 508-549-6770 15 November 1991 Mr. C.H. Berlinger Generic Communication Branch United States Nuclear Regulatory Commission Washington, DC 20555
SUBJECT:
Nuclear Notification, Foxboro Seismic Mounting Kit, Part Number N0150RG (Horizontal Pipe Mounting of N-E11GM, DM, and AH Transmitters)
Dear Mr. Berlinger,
Attached is a copy of a letter which has been sent to customers who are on record as having purchased the subject units from The Foxboro Company. The customers are:
Connecticut Yankee Atomic Power Company Indiana Michigan Power Company New Hampshire Yankee Niagara Mohawk Power Corporation Rochester Gas & Electric Corporation Southern California Edison Weed Instrument Company, Incorporated was notified on 8 November 1991 because initially we believed they were the only one with the incorrect material.
The notification to customers was mailed today, 15 November 1991.
Very trul yours, S.H. Rizvi, Director Corporate Quality Assurance baa(PWO09391)
Attachment ASIECOMPANY 201020017 911115 PDR ADOCK Q000206 S
P DR
mmmm QuThe Foxboro Company Foxboro, MA U.S.A.
02035-2099 Telephone: 508-543-8750 Telex: 927-602 or
- Title* *First Name* *Last Name*
- Position*
- Company*
- Address*
- City*, *State*
- Zip*
SUBJECT:
Foxboro Seismic Mounting Kit Pt. No. NO150RG (Horizontal Pipe Mounting of N-E11GM, DM and AH Transmitters)
Reference:
Dear *Title* *First Name* *Last Name*
In compliance with 10CFR Part 21.21(a)(1)(ii), this letter is to notify you that we may have shipped you, as an N-E10 Seismic Mounting-Kit, P/N NO150RG with the incorrect transmitter-to bracket mounting socket cap screws. The mounting kit is for Horizontal Pipe Mounting of N-E11GM, N-E11DM or N-E11AH Transmitters. The mounting kit may also have been shipped with a transmitter order.
The mounting kit may have socket cap screws of material ASTM 384 (18-8 SS)(P/N XOl34FC) versus the correct material ASTM A574 (P/N XOl34EM).
The ASTM 384 stainless steel socket cap screws are easily recognized by the bright silvery finish of stainless and the correct screws have a yellow chromate plating which is pale amber color. The difference between the tensile and yield strengths of the two materials is significant. The combined seismic stresses of tensile and shear for some seismic applications would be greater than our desiqn requirement of 0.6X Yield Strength for the cap screw material ASTM 384.
Potential failure of the ASTM 384 socket cap screws under seismic dynamic tensile and shear loads is possible, thus they must be replaced.
In May of 1989 an order of socket cap screws of the incorrect ASTM 384 material was received from our supplier. The incoming inspector failed to follow the proper inspection procedures and the incorrect socket cap screws were accepted. Corrective actions are being implemented to prevent reoccurrence.
Seismic mounting kits P/N NOl50RG were assembled at Foxboro and distributed either by us or through Weed Instrument. If you received the P/N NO150RG kit after May 1989, then visual inspection of kits in your stock and/or of the mounted transmitters for the incorrect cap screws is required. As stated above, the difference in finish, silvery versus pale amber, will identify the incorrect stainless steel screw. Also, the correct screws are magnetic and the incorrect ones are stainless steel non-magnetic which gives an additional means of checking the screw material.
SIEBE
A SIEBE COMPANY Nuclear Notification Page 2 The Foxboro Master Instruction 020-165 for Seismic Mounting must be followed for replacement and tightening of the correct cap screws. The screws are identified as bolt "A" in the MI 020-165.
The correct socket cap screws P/N XOl34EM are available and will be forwarded upon request at no charge.
Any questions regarding this notification or procedures please contact:
Ms. Sheila Foskett The FOXBORO CO.
Tel.(508) 549 -
4053 or Fax (508) 549 -
4330 S.H.
- Rii, Director Corporate Quality Assurance baa(PWO09291)