ML20134N746
| ML20134N746 | |
| Person / Time | |
|---|---|
| Issue date: | 02/19/1997 |
| From: | Chaffee A NRC (Affiliation Not Assigned) |
| To: | Teague J GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 9702240420 | |
| Download: ML20134N746 (3) | |
Text
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9 February 19, 1997 Mr. James E. Teague Manager Engineering General Electric.
Meter and Control Business Department 205 Great Valley Parkway Malvern. PA 19355-0715
SUBJECT:
REQUEST FOR A TECHNICAL REVIEW OF A DRAFT INFORMATION NOTICE REGARDING POTENTIAL ARMATURE BINDING OF hGA RELAYS Mr. Teague:
The U.S. Nuclear Regulatory Commission (NRC) is planning to issue an information notice to transmit GE Relay Service Advice Letter 516.1 to ensure that all licensees receive the information. We ask that you review the
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enclosed draft of that information notice to ensure the technical information is accurate.
Your cooperation in this matter is appreciated.
Please return any comments you may have as soon as possible. A co)y of this request and your response will be placed in the Public Document Room for review by the public.
Your response should be mailed to:
U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 ATTN: David Skeen. NRR/PECB MAIL STOP: 011E4 Please address any questions you may have on this matter to David Skeen of my staff.
Mr. Skeen may be reached by phone (301) 415-1174 or E-mail (dis @nrc. gov).
If no comments are received by close of business February 28.
1997, we will assume the technical information in the notice is correct.
loriginalsignedbyRobertL.Dennigl Alfred E. Chaffee Chief Events Assessment and Generic Communications Branch Division of Reactor Project Management Office of Nuclear Reactor Regulation
Enclosure:
Draft Information Notice Distribution:
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OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C. 20555-0001 i
February xx 1997 r
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NRC INFORMATION NOTICE 97-XX: POTENTIAL ARMATURE BINDING IN GENERAL ELECTRIC l
TYPE HGA RELAYS i
l Addressees i
All holders of operating licenses or construction permits for nuclear power reactors.
Puroose
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The U.S. Nuclear Regulatory Commission is issuing this information notice to
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alert addressees that two General Electric (GE) type HGA relays failed to reposition when the coils were deenergized.
It is expected that recipients will review this information for applicability to their facilities and consider actions, as appro)riate, to avoid similar problems.
- However, suggestions contained in tais information notice are not NRC requirements:
therefore, no specific action or written response is required.
Descriotion of Circumstances On May 15. 1996. Commonwealth Edison Company (Comed) reported that two 12HGA17S63 relays instalied in the reset logic for the 3rimary containment isolation system at its Dresden Nuclear Power Station. Jnit 3. failed to-reposition when operators removed power to the relay coils.
Comed personnel removed the relays and disassembled them in an attempt to determine the root cause of the problem. When a root cause could not be determined, the failed relays were sent to GE Power Management (GE PM) located in Malvern.
Pennsylvania, for a thorough investigation.
Discussion GE PM reassembled the failed relay submitted by Comed for a root cause analysis and it operated properly, both mechanically and electrically. When GE PM performed a dimensional analysis of the critical parts, however, the assembly hole of the molded contact support was found to be slightly off-j center.
GE PM stated that the mold that produces the contact support was reworked in 1990 to correct for mold wear and to bring the parts well within the design drawing tolerances, GE PM issued Relay Service Advice Letter 516.1 on October 25. 1996, to alert customers that HGA_ relays manufactured between January 1989 and June 1991 may have marginal armature-to-contact support clearance and may be susceptible to i
armature binding.
E IN 97-XX February xx. 1997 Page 2 of 2 However, some licensees may have procured the relays as commercial-grade, or received them as basic components from a dedicating entity.
Therefore, some licensees may not have received the attached letter and, consequently, may not have had the opportunity to evaluate the information in accordance with 10 CFR 21.3.
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This information notice requires no specific action or written response. If you have any questions about the information in this notice, please contact one of the technical contacts listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) project manager.
Thomas T. Martin. Director Division of Reactor Program Management Office of Nuclear Reactor Regulation i
Technical contacts:
K. Naidu. NRR 4
(301) 415-2980 E-mail: krn@nrc. gov S. Aiexander. NRR (301) 415-2995 E-mail: sda@nrc. gov D. Skeen. NRR (301) 415-1174 E-mail: dis @nrc. gov Attachments: 1. GE Relay Service Advice Letter 516.1
- 2. List of Recently Issued NRC Information Notices