ML20199L781

Advises That Util Willing to Change Power Supply to SPDS Cabinets to 10-ampere Power Supply,Contingent Upon NRC Confirmation That SPDS Isolation Device Design Acceptable W/ Change.Energy,Inc Test Rept EIP-TR009C Encl

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: ML20199L781 ML20199L800
References
7776L-GDW, GDW-86-155, MN-86-84, NUDOCS 8607100013
Download: ML20199L781 (2)

Text

- -

s .. .. ,

o -

EDISON DRn/E

. 'MAME HARHEE M0ml0POWERComPARUe AUGUSTA, MAINE 0433,6 (207) 623-352k ,

e . .

n

.. o July.1, 1986 ,

. HN-86-84~ ^ GDH-86-155

-= .

, , s -

=

u. .

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. ,

g

References:

ta) ' License.No. DPR-36 (Docket No. 50-309)

~

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

~

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.

• 0-N872MaM%<9

,e . , .

/ .

\

00 7776.L GDH , , .

T , .

a g

• MAINE YANKEE ATOMIC PONER ' COMPANY -

~ *

~

-United States Nuclear Regulatory Commiss' ion Page Two .

Attention: Mr. Ashok C. Thadani, Director , MN-86-84 * -

. e *

, Altho k devices m, ugh we ust,be know of to designed nowithstand.

NRC. requirementthe asumed' or industry, installation standard of jumpers that isolation 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 i.solators performedisfor a copy of the Portland test report General for .the Electric. TheEnergy analogIncorporated,,d 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

~

c

~

ygg. -

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 -

O b

4 e 9

e .> a .

- r *

e. -

e *

• ~ & y

. 9 I & **

a g e 7776L-GDH , .

• O g ,