ML20199L781
| ML20199L781 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 07/01/1986 |
| From: | Whittier, Whittier G Maine Yankee |
| To: | Thadani A Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20199L787 | List: |
| References | |
| 7776L-GDW, GDW-86-155, MN-86-84, NUDOCS 8607100013 | |
| Download: ML20199L781 (2) | |
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'MAME HARHEE M0ml0POWERComPARUe EDISON DRn/E AUGUSTA, MAINE 0433,6 (207) 623-352k e
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July.1, 1986 HN-86-84~
GDH-86-155
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Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Hastlington, D. C, 20555 Attention:
Mr. Ashok C. Thadani, Director
.PHR Project Directorate #8 D1 Vision of Licensing.
References:
ta) ' License.No. DPR-36 (Docket No. 50-309)
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Subject:
SPDS Isolation Devi,ces Gentlemen:
As discussed with members of your staff, the non-nuclear-safety class portions of the SPDS are. separated from safety class electrical circuits,by isolation devices.
These isolation devices have been tested at 140 volts and 10 amps, which webelieve is equal to or greater than the maximuni credible fault to which the isolation devices should be subjected. A breaker just inside the SPDS' electrical cabinet power supply limits the 120 volt electrical supply.to @ amps.
The'NRC staff has.taken the position that the design of the isolation
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d'evice must prowide for 'a jumper assumed to be installed around this breaker, since the breaker is located in the same elegtrical cabinet as the isolation l
device.
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MAINE YANKEE ATOMIC PONER ' COMPANY
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-United States Nuclear Regulatory Commiss' ion Page Two
Attention: Mr. Ashok C. Thadani, Director MN-86-84
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devices m, ugh we know of no NRC. requirement or industry, standard that isolation ust,be designed to withstand. the asumed' installation of jumpers or technician errors, we are willing to change the power supply to the SPDS cabinets to a ten amp power supply. This offer.is made contingent upon receiving confirmatkn from the staff th'at the SPDS isolation device design i.s
' acceptable with the power supply' change. The.ch nge will'be made as soon as practicable following receipt of your acceptance e
Also, enclosed is a copy of the test report for.the Energy Incorporated,,d i.solators performed for Portland General Electric.
The analog isolators use in the Maine' Yankee SPDS have the same isolation interface a'nd similar card
- architecture to those used in the test. The test report was previously,.
informally transmitted to the staff.
Very truly yours,
' MAINE *YANKEEATOMICP0HEkCOMPANY
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G. D.'Hhittier, Manager Nuclear Engine'er.ing and Licensing GD,H/bj$
Enclosure:
Energy Incorporated Report EIP-TR009C cc: Dr. Thomas E. Murley Mr. Pat:Sdars.
Mr. Cornelius F. Holden s
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