ML20112H190

Provides Info Responsive to NRC Concerns Re Voltage & Current Testing Levels Used to Verify Isolation Capability for SPDS Isolators.Tec Model 980-3 & 981-1 Isolators Acceptable for Intended Applications

ML20112H190
Person / Time
Site:	Clinton
Issue date:	01/11/1985
From:	Spangenberg F ILLINOIS POWER CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
U-0779, U-779, NUDOCS 8501170022
Download: ML20112H190 (3)

Text

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. . U- 0779 L30-85(1 -ll)-L 1A.120

/LLINDIS POWER COMPANY CLINTCN POWER STATION. P.o. BOX 678. CLINTON. ILLINOIS 61727 January 11, 1985 Docket No. 50-461 Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Clinton Power Station Unit 1 Safety Parameter Display System

Dear Mr. Schwencer:

The following information is being provided in response to NRC Staff concerns regarding the voltage and current testing levels used to verify isolation capability for the Safety Parameter Display System (SPDS) isolators. The voltage and current testing levels used to verify isolation capability are supported by the following information concerning the Clinton design.

I. Power to the non-1E side of the Isolator Cards A. Power to Cabinet - The fuse has not been sized but load is approximately 600VA and installation of a 15A fuse is anticipated. The power supply is 120VAC.

B. The +15VDC power supplies to Isolator Cards have a combined fuse capacity of 6 amps. This is two power supplies in parallel (3 amps each).

C. The -15VDC power supplies to Isolator Cards have a combined fuse capacity of 2 amps. This is two power supplies in parallel (1 amp each).

II. Power supplied by Computer Digital Input / Output (I/0) Cabinet to the non-1E side of Digital Isolator 981-1A.

A. The I/O cabinets are supplied with 120VAC. Two of the four cabinets are fused at 30 amps. The other two are fused at 15 amps.

B. 48VDC power supplies feed the non-1E isolator loop. Each eight channel card is fused at k amp.

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III. Analog I/O Cabinets Computer Power to the cabinets is provided through a 15 amp fuse at 120VAC.

IV. Analog I/O Computer Cabinets Each input to the computer from the isolation cards is fed into a signal conditioning (SC) card. The input passes through the SC card to a point-switch card. This card is the base for multiplexing " flying capacitor" monitoring circuits for the 4 channel card. (The " flying capacitor" is first charged by the isolator output then disconnected from the isolator and connected to the computer monitoring circuits.)

We conclude that the TEC Model 980-3 and 981-1 isolators are acceptable for our application based on the above information, the attached TEC letter dated December 21, 1984, and the information available in the following vendor documents.

1) Model 981-1A Isolator Module 120VAC @ 20 amp (DBE) Test Results, dated 12/5/84, by TEC.

2) Model 981-1A Isolator Module 2KV @ 10 milli-amps (DBE) Test Results, dated 12/5/84, by TEC.

3) Instruction / Maintenance Manual (30533-0M-01) Appendix C and Appendix D, by TEC.

4) Model 156, 980, 981 Isolator Module 120VAC @ 20 amp (DBE) Test Results, dated 11/19/84, by TEC.

Recently, we have determined that TEC Hodel 156 isolators for Division 4 SPDS parameters will be required. The Model 156 isolator uses magnetic coupling as its isolating mechanism and uses the same isolator module as the Model 980-3. We will either present an analysis of the applicability of the TEC Model 980-3 test results or perform tests of the isolators, whichever is acceptable to the NRC Staff.

Sincerely yours, F. A. Spa gen rg Director - Nuclear Licensing and Configuration Nuclear Station Engineering TLG:1m Attachment cc: B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Regional Administrator, Region III, USNRC Illinois Department of Nuclear Safety

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Clinton Power Station 6 miles East of Clinton, Route 54 I Clinton, Illinois 61727 .

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Subject:

Illinois Power Company, Clinton Power Station Isolator CabineM, qr- Contract K 2927, P. O. E93760: TEC 980 and TEC 156 120VAC an., {

2000 VDC Testing ,

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• Gentlemen:

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Technology for Energy Corporation hereby confirms the fullowing relative (

to testing of the TEC Model 980 and TEC Model 156 Analog Signal Isolators, j

1. The TEC 980-3 has been tested with 120 VAC, 20 amp on the output with  ;

the fuses shorted. This test did not degrade its isolation capability.

2. The TEC Model 980-3 was tested with 2000VDC, 20 ma on the output with  ;

fuses installed. In that this test did not damage the fuses, an additional test with fuses shorted is not necessary. This test did not degrade its isolation capability.

3. The TEC 156 Analog Isolator has not been tested at either 120VAC or 2000VDC with the fuses shorted. With fuses installed the 120VAC or 2000 VDC tests did not degrade the 31 olation capability. -

N Sincerely, ,

William A. Pfeifer, Han ge Specialty Products Department i

WAP:wks cc: Mr. John O'Brien, Illinois Power Company Mr. Dan Franzak, Sargent & Lundy Engineers CNE ENERGY CENTER PE LLt$$1f'PI PA RMWAY KNOXVI.LE. IN 379M PHONL ttt$1966 5454 TELEX 810 $101710 I