ML19224D768

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Submits Supplemental Info to Util 790619 Ltr Re Addl Instrument Qualification & Justification for Use of Barton Transmitters
ML19224D768
Person / Time
Site: North Anna Dominion icon.png
Issue date: 07/13/1979
From: Stallings C
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Parr O
Office of Nuclear Reactor Regulation
References
540, NUDOCS 7907170019
Download: ML19224D768 (2)


Text

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VruarNIA ELECTRIC AN D POWEH C O.'t PA N Y R ECIIM ON D,VI HO IN IA 2 02 (31 July 13, 1979 Mr. Harold R. Denton, Director Serial No. 540 Office of Nuclear Reactor Regulation P0/FHT:baw Attention: Mr. O. D. Parr, Chief Docket No. 50-338 Light Water Reactors Branch No. 3 License No. NPF-4 Division of Project Management U. S. Nuclear Regulatory Commi_ssion Washington, D. C. 20555

Dear Mr. Denton:

North Anna Unit No. 1 Additional Instrument Qualification Information This is a supplement to our letter of June 19, 1979, regarding additional in-strucent qualification information for North Anna Unit 1.

The initial justification for use of the Barton Transmitters at North Anna was presented as an attachment to o c letter of August 22, 1978, Serial No. 424.

In response to your requests, sditional justification has been provided since that submittal. The followin;< aummarizes the most recent subntittals on this topic.

In a letter sent to Mr. Harold R. Denton, Serial No. 541, September 29, 1978, we submitted a report entitled " Westinghouse Reactor Protection System /

Engineered Safety Features Actuation System Setpoint Methodology." That report contains a table which shows instrument setpoints and allowed de-viations. You will note that an allowance of +14% has been made for the Barton 763 Narrow Range Pressurizer Pressure to account for the inaccu-racier, which were seen during LOCA testing. In a follow-up letter, Serial No. 565, October 13, 1978, we indicated that the tiip setpoints at North Anna vill be revised based on the new methodology. 'Ihe environmental effects of the LOCA testing will be accounted for by a setpoint change.

Also, additional testing performed by Westinghouse - ' reported in NS-TMA-1059, dated September 29, 1978, demonstrates tb curacies would be within specification for radiation doses and env. ents characteristic of design lasis events. In the NRC evaluation le. _er (dated May 15, 1978) of NS 'IMA-1950, the Staff did request Westinghouse to perform additional coafirmatory testing on production Lot 1 Barton transmitters to demonstrate their long-term acceptability. Westinghouse will be completing an additional test program on the Barton Lot 1 transmitters to provide the additional justification requested by the NRC. Preliminary results are expectee to be available by the requested date of September, 1979. Westinghouse s te ces that the details of this additional test program have not yet been finalized, but will be submitted to the NRC within the stipulated period.

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YlHLINIA blLCT HIC AN U k'OW E k (UM P%NY IO a . IIarold R. Denton, Director T.~ 2 Ibsed on this additional info.mition and on our previously subnitted quali-fication data, we feel that the use of the existing Barton transmitters at North Anna is justified.

If you require additional infonnation, please contact this office.

Very truly yours, b*- )/, L]7billa C. M. Stallings Vice President-Power Supply and Produetion Operations cc: Mr. James P. O'Pailly, Director Of fice of Inspection & Enforcenent Region II

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