ML20041F247

Submits Revised Design Re Redundant Logic Relays & Power Supplies.Revision Provides Total Channel Independence. New Relays Will Be Bench Tested Prior to Declaring Sys Operable

ML20041F247
Person / Time
Site:	Maine Yankee
Issue date:	03/08/1982
From:	Garrity J Maine Yankee
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
JHG-82-45, MN-82-45, NUDOCS 8203160328
Download: ML20041F247 (4)

Text

{{#Wiki_filter:1 ,,,. ~.- MAME d HAllHEE A10ml0POVER00mPAR9* guougr,jain"g% (207) 623-3521 me March 8, 1982 MN-82-4 5 JHG-82-45 o A P RECElygg ,9\\ p. \\ mag 3 'O198N ~ l ~ ed States Nuclear Regulatory Commission nk 631 Park Avenue ( ff King of Prussia, Pennsylvania 19406 g Attention: Mr. Ronald C. Haynes Regional Administrator 5

References:

(a) License No. DPR-36 (Docket No. 50-309) (b) MYAPCo letter to USNRC dated February 22, 2982, MN-82-30

Subject:

Safety Injection Actuation Signal - Redundant Logic Relays and Power Supplies

Dear Sir:

Reference (b) transmitted a description of a design change to provide redundant logic relays and redundant power supplies which is currently being reviewed by ONRR. The preliminary design change provided earlier is being revised slightly to provide total channel independence. This revision which is illustrated in the attached drawings (ll550-ESK-7J and 7K), has been discussed with the ONRR reviewer. Prior to declaring the system operable, we will bench test the new relays, perform a continuity check of new wires, and test the modified system from the sensor to and through the matrix relays up to the blocked 86 device. Maine Yankee also commits to administrative action to ensure that should the number of operable sensors for SIA from either high containment pressure or low pressurizer pressure fall to the minimum required by Technical Specification Table 3.9-2, accomodation of the failure of an additional sensor will occur without adversely affecting the SIAS. This will be accomplished by placing at least one inoperable sensor in a condition that produces a trip sigr.a l. Within 30 days of receipt of NRC approval of the SIAS design modification, Maine Yankee will submit a proposed change to the technical kQ specification to make the availability of this enhanced protection a limiting condition for operation. This course of action has been discussed with and agreed to by Maine Yankee's ONRR Project Manager. g noy 8203160328 ^820308 T' WW PDR ADOCK 05000309 6M S P PDR c,,

MAINE YANKEE A70MIC POWER COMPAfiY - 7 ~. lhited States Maclear Regulatory Commission March 8, 1982 Attention: Ronald C. Haynes Page Two We trust this information is satisfactory. Should you have any further questions, please feel free to contact us. Sincerely yours, MAINE YANKEE ATOMIC POWER COMPANY (I / J hM 1 s John H. Garrity, Senior IDirector Nuclear Engineering and Licensing JHG/bjp Enclosure 4 I ) J

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