ML20073D731

Forwards Addl Info to Resolve SER Open Item 4 Re Solid State Programmable Logic Sys

ML20073D731
Person / Time
Site:	Clinch River
Issue date:	04/12/1983
From:	Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT
To:	Grace J Office of Nuclear Reactor Regulation
References
HQ:S:83:245, NUDOCS 8304140180
Download: ML20073D731 (3)

Text

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Department of Energy I Washington, D.C. 20545 Docket No. 50-537 HQ:S:83:245 APR 3 g mg Dr. J. Nelson Grace, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Dr. Grace:

RESPONSE TO SAFETY EVALUATION REPORT (SER) OPEN ITEM NO. 4 - SOLID STATE PROGRAMMABLE LOGIC SYSTEM (SSPLS)

Enclosed is additional infonnation to clarify Clinch River Breeder Reactor Plant project commitments regarding the SSPLS, as discussed with the Nuclear Regulatory Connission staff. This information should enable the staff to complete their review and resolve Open Item No. 4 of SER Section 1.6.

Any questions regarding the enclosed infonnation may be addressed to Mr. A. Meller (FTS 626-6355) or Mr. D. Hicks (FTS 626-6022) of the Project Office Oak Ridge staff.

Sincerely, 1

oD Longenecker Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy Enclosure cc: Service List l Standard Distribution QOi Licensing Distribution 8304140100 830412 PDR ADOCK 05000537 E PDR

3 Enclosur@

SSPLS (SOLID STATE PROGRAMMABLE LOGIC SYSTEM)

The SSPLS availability for each device channel has been specified at 99.9955%. The CRBRP Project has included this as a design goal and this or any other acceptable availability is subject to negotiations with vendors.

The CRBRP Project agreed to obtain availability data from vendors. Three vendors were informally contacted with the following information received:

(1) Condec/ Consolidated Controls Corporation They informally committed they could meet our avail-ability of 99.9955%.

Their normal ranges are:

Availability MTBF* MTTW

• 10,000 hrs 8 hrs 99.92 2 hrs 99.98 10,000 hrs 99.99 10,000 hrs 1 hr (2) Electro-Mechanics, Inc.

- They informally committed they could meet our avail-ability of 99.9955%. Their normal availability is 98%. They would not give us any further details, including MTBF and MTTR information, prior to bidding.

(3) Forney Engineering Company Repeated discussions with them resulted in obtaining no detailed information for their normal availability range. They informally committed they could meet our availability of 99.9955%; however, they stated that this would be possible only at substantially higher costs.

The Project expressed a concern with using a specific avail-ability number in the SER, given the extensive negotiations yet to be completed and the Further, widebid actual range of acceptable commitments may avail-deviate ability numbers. That is still our CRBRP position.

from informalif thecommitments.

NRC includes a number, it should be included as However, a goal, and the NRC should recognize that the Project will finalize the availability in negotiations, fully considering the vendors' capabilities and Project costs. ,

Mean Time Before failure

• • Mean Time To Repair l

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. . . ...'".~ p-O Further items discussed include:

(1) The CRBRP specification includes EMI*and surge protection requirements.

(2) Microprocessor or discrete logic may be used; the Project will accept either, and this is acceptable to the NRC.

(3) It was agreed that SSPLS as proposed provides a reliable method for manual initiation in accordance with IEEE 279, Section 4.17.

J

• Electromagnetic In+.erference

-. - ..