ML20129K134
| ML20129K134 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/19/1985 |
| From: | Crouse R TOLEDO EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 1-531, IEB-84-02, IEB-84-2, NUDOCS 8507230419 | |
| Download: ML20129K134 (3) | |
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Docket No. 50-346 TOLEDO License No. NPF-3 EDISON Serial No. 1-531 RICHARD P. CROUSE vai nnan June' 19, 1985 w
gal 249 5221 Mr. James G. Keppler Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Dear Mr. Keppler:
IE Bulletin No. 84-02 (Log No. 1-932) concerned failures of General Electric type IEA relays in use in Class IE safety systems. This bulletin requested a replacement plan and schedule for replacing nylon or lexan coil spool-type IEA relays used in normally energized safety-related applications and nylon coil spool-type IEA relays used in normally de-energized safety-related applications.
In response to IE Bulletin No. 84-02, Toledo Edison submitted Serial No. 1-450 dated July 13, 1984.
This letter discussed the fif ty-six General Electric type IEA relays used in safety-related applications at the Davis-Besse Nuclear Power Station Unit No. 1.
Serial No. 1-450 referred to six of the fifty-six relays as being normally energized.
It has been determined that two of these six relays are not normally energized. Accordingly this letter is submitted to supersede Serial No. 1-450 and reflects the fact that there are four rather than six normally energized relays.
It also provides an updating of the status of the replacement of the affected normally energized, lexan coil spool-type IEA relays.
All fifty-six relays are lexan coil spool-type and are DC excited.
No nylon coil spool-type IEA relays are used in safety-related applications.
No HFA relays are used in reactor trip systems at Davis-Besse Nuclear Power Station Unit 1.
The four normally energized, lexan coil spool-type IEA relays are being replaced before the end of the 1986 refueling outage.
General Electric recommended that the lexan coil spool-type relay be replaced with a IEA Century Series Tefzel coil spool-type relay. Toledo Edison has reviewed the qualification documents for the Century Series Tefzel coil spool-type relay and determined that the relay meets the requirements of the applicable IEEE standards.
8507230419 850619 PDR ADOCK 05000346 G
,JUN 241985 THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO, OHlO 43652 18' igg
Dock;t No. 50-346 fic nra No. NPF-3 Serial No. 1-531 June 19, 1985 Page 2 Visual inspections were performed upon receipt of this bulletin.
The inspection consisted of observing through the relay covers whether or not the coils bobbins had visible cracks or evidence of melting. The lexan coil spools appeared to be in good working condition.
Similar visual inspections will be performed on a monthly basis until the safety-related normally energized relays are replaced.
IE Bulletin 84-02, Item Ic, " Plants in Operation" requested that Toledo Edison provide a basis for continuing operation for the period of time until the normally energized relays are replaced. Based on the following reasons, continued operation of the plant is justified until the normally energized relays are replaced:
(1) The four normally energized relays are being replaced before the end of the 1986 refueling outage; (2) No HFA relays are utilized in reactor trip systems; (3) Visual inspections have been performed and will continue to be performed on a monthly basis until the relays are replaced; (4) There have been no failures of the approximately 191 HFA relays used in both safety-related (56) and nonsafety-related (135) applications during the plant's history; and (5) the four normally energized HFA relays in service in safety applications at Davis-Besse are "DC" excited.
In IE Bulletin 84-02, reference is made on Page 1 and 2 to HFA Series "AC" relays.
General Electric Instruction GEH-2024C (Multicontact Auxiliary Relay Type HFA51) lists the burdens for AC and DC excited HFA relays in the picked up position. The DC coil burden is listed as 7.8 Watts while the AC coil burden is greater, listed as 12 Watts (32 volt-amperes).
To assist the NRC in evaluating the cost of this bulletin, the Toledo Edison staff time to perform the requested review and prepare the requested documentation was approximately 400 manhours.
Very truly yours,
- Nhj RPC
- DRW:lah cc:
DB-1 NRC Resident Inspector U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
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a ATOMIC ENERGY ACT OF 1954 SECTION 182a SUBMITTAL IN RESPONSE FOR THE DAVIS-BESSE NUCLEAR POWER STATION UNIT NO. I FACILITY OPERATING LICENSE NPF-3 This letter (Serial No. 1-531) is submitted in conformance with Atomic Energy Act of 1954 Section 182a in response to IE Bulletin 84-02 (Log No. 1-932). This deals with failure of General Electric Type HFA Relays in use in Class IE Safety Systems.
By WWb;==-__
R. P. Crouse l
Vice President, Nuclear I
Sworn to and subscribed before me this // d day of June, 1985.
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Notary Public, State of Ohio LAURIE A. BRUDZINSKI Notary Public. $ tate of Chie My Commission Empires May 16,1988