ML19210A135
| ML19210A135 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/07/1976 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910240855 | |
| Download: ML19210A135 (4) | |
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METROPOLITAN EDISON COMPANY POST OFFICE BOX 542 REACING. PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 May 7, 1976 GQL 0660 ph
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Mr. J. P. O'Reilly
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Office of Inspection and Enforcement Divisien of Reactor Inspection Progress Washington, D.C.
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Dear Sirs:
Three Mile Island Nuclear Stati n, Unit 1 (TMI-1)
Docket No. 50-289 Operating License No. DPR-50 IE Bulletin 76-05 This letter and the attached enclosure are provided in response to your IE Bulletin 76-05, and is being submitted one day late in accordance with the May 7, 1976 conversatica between our Mr. Moran and your M. Spessard.
With regard to the Westinghouse Service letter referenced in the bulletin, we had not received it prior to receipt of the bulletin, Please be advised, however, that we have subsequently established cc=munications with Westinghouse regarding the details of this matter, and vill continue working with them, as may be appropriate, until this =atter is resolved.
We believe our actions as presented in the attached enclosure are sufficiently responsive to the concerns raised by the subject bulletin. Should you, hcvever, have any additional questions or concerns, please centact me.
Sincerely, n
I R. C. / Arnold Vice President RCA:JJM:ilm 1490 023 Enclosure 1%b Pile: 61.0016.C003.C053
J Three Mile Island Nuclear Station Unit 1 (TMI-1)
Docket No. 50-239 Cperating License N'. DPR-50 Resp (nse to IE Bulletin 76-05 We have found that there are a number of 3FD relays in use on safety related systems. The relays are used in two applications:
1.
The "Y" relay located on DHP Westinghouse Circuit Breakers and 2.
The control relays for the 1A and 13 Energency Diesel Generators.
The relays on the DHP circuit breakers have a molded coil (Coil number 506C322GO2).
We believe these coils are not subject to the failure mentioned in the II Eulletir and therefore no further action is required.
There are 29 breakers on the 1D and lE hKV busses. Each breaker ha one relay.
There are 3h EFD relays on each diesel generatcr (66 total). Each relay is believed to have the coil indicated as "defectivc" by the IE Bulletin (Coil style 503Ch28G21). Many of the relays are energized for long perieds of time.
Failure of sc=e of the relays could affect the operability of the diesel generator.
Our discussion with Westinghouse indicates that the coils / relays are not subject to failure / sticking at normal voltages (125 VDC _ 10%). Reliable operation could therefore be expected up to 137 VDC.
Our batterr charger float (normal) voltage is 130 V + IV.
Equalize charge is set at 135 volts + 2 volts. The battery is normally put on equalize when specific gravity readings drift down, or following the refueling interval load test.
The duration of the equalize charge 10 normally 2h to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
Two continuously energized relays on the A Diesel Generator were checked.
They were selected because they represent the vorst case regarding aging.
The CF1 coil outside te=perature was measured as 80 C with an ambient te=perature 0
of 220C.
The supply voltage was measured as 129.6 VDC.
Relay Decienation Physical Coniition Droucut Time CF 1 Shoved some signs of heat 19.8 MS aging. The black spool piece was broken or broke during disassembly. The nylon sleeve was discolcred and brittle.
CF 2 Shoved sc=e signs of heat 20.1 MS aging. Nylon sleeve dis-colored.
A functional test was performed on all the EFD relays in the A Diesel Generator cabinet. All relays responded properly to the test.
1490 026
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The relay coils show adverse effects from the heat; however, we believa the degree of degradation does not indicate 1:::minent failure, even concidering the number of relays in the system. We will evaluate ventilation of the cabinet.
We plan to replace all the subject relays during the next refueling.
1490 027