ML18037A637

Responds to NRC 930413 Request That Util Submit Satisfactory Electromagnetic Interference/Radio Frequency Interference Tests & Onsite Survey for GE Nuclear Measurement Analysis & Control Equipment Installed in Rbvprm.Test Repts Encl

ML18037A637
Person / Time
Site:	Browns Ferry
Issue date:	12/23/1993
From:	Salas P TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18037A638	List: ML18037A637 ML18037A640 ML20062L920 ML20062L929 ML20062L932
References
TAC-M84161, TAC-M84162, TAC-M84163, NUDOCS 9401050396
Download: ML18037A637 (12)

Text

ACCELERATED ISTRIBUTION DEMON. '7RATION SYSTEM REGULATORY XNFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9401050396 DOC.DATE: 93/12/23 NOTARIZED: NO DOCKET g FACXL:50-259 Browns Ferry, Nuclear Power Station, Unit 1, Tennessee 05000259 50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 50-296 Browns Ferry Nuclear Power Station, Unit 3, Tennessee 05000296 AUTH. NAME AUTHOR AFFILIATION SALAS,P. Tennessee Valley Authority RECIP.NAME RECIPXENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to NRC 930413 request that util submit satisfactory electromagnetic interference/radio frequency interference D tests 6 onsite survey for GE nuclear measurement analysis &

control equipment installed in RBVPRM.Test repts encl.

DISTRIBUTION CODE: AOOID COPIES RECEIVED:LTR I ENCL l SIZE: 71 TITLE: OR Submittal: General Distribution NOTES' D

RECIPIENT COPIES RECXPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D PD2-4 1 1 PD2-4-PD 1 1 TRIMBLE,D 2 2 WILLIAMS,J. 2 2 INTERNAL: ACRS 6 6 NRR/DE/EELB 1 1 NRR/DORS/OTSB 1 1 NRR/DRCH/HICB 1 1 NRR/DRPW 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 NUDOCS-ABSTRACT 1 1 OCJMEDCB 1 0 OGC/HDS3 1 0 G 01 1 1 EXTERNAL: NRC PDR 1 1 NSIC 1 1 R

D A

D D

NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASfEI CONTACT THE DOCUMENT CONTROL DESK ROOM P l-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEEDI TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL 22

Tennessee Valley Authority. Post Office Box 2000, Decatur. Atabarna 35609 DEC 23 j993 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-259 Tennessee Valley Authority ) 50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) UNITS 1i 2q AND 3 - REPLY TO NRC REQUEST TO PROVIDE RESULTS OF BFN ELECTROMAGNETIC INTERFERENCE/RADIO FREQUENCY INTERFERENCE (EMI/RFI) TESTS AND ON-SITE SURVEYS FOR THE REACTOR BUILDING VENTILATION RADIATION MONITORING SYSTEM (TAC Nos. M84161, M84162 and M84163)

REFERENCES:

1. NRC letter to TVA dated April 13, 1993, "Issuance of Amendments (TAC Nos. M84161, M84162 and M84163)(TS-316)."

2. TVA letter to NRC dated March 16, 1993 "Browns Ferry Units 1, 2, and 3 Application for Amendment to Facility Operating Licenses DPR-33, DPR-52, and DPR-68, Section 3.2/4.2, Technical Specifications, Response to NRC Request for Additional Information, NRC Docket Nos. 50-259, 50-260, and 50-296."

The purpose of this letter is to reply to NRC's request that TVA submit satisfactory electromagnetic interference/radio frequency interference (EMI/RFI) tests and on-site surveys for the General Electric (GE) Nuclear Measurement Analysis and Control (NUMAC) equipment installed in the BFN Reactor Building Ventilation Radiation Monitoring (RBVRM) System (Reference 1). In addition, this letter describes the administrative controls that are in place to assure that 030C-"9 ~go 940105039b 931223 PDR ADOCK 05000259

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U. S. Nuclear Regulatory Commission Page 2 DEC 23 l993 spurious signals from walkie-talkies and temporary equipment in the areas of the NUMAC RBVRM equipment do not affect its operation.

Per Reference 1, NRC approved BFN Units 1, 2, and 3 Technical Specification changes that reflected the design change to the RBVRM system to replace analog components with digital NUMAC equipment manufactured by GE. NRC determined that the NUMAC RBVRM system is EMI/RFI qualified for the BFN environment contingent upon the following:

1 ~ Performance of two-days worth of on-site EMI/RFI surveys as discussed in a March 19, 1993, telephone call between TVA and NRC. The testing was to be performed as follows: one day during transient conditions and one day during stable conditions for both the refuel floor and the control room.

Transient conditions for the refuel floor around the location of the monitor would be during refueling operations, whereas for the control room it would be during startup.

2 ~ Performance of additional EMI/RFI testing as described in Reference 2 for the frequency ranges that had not been covered by GE's earlier NUMAC tests.

3. Submittal of reports for the above showing acceptable survey and test results.

4 ~ Maintenance of administrative controls on the use of walkie-talkies, portable telephones, and temporary equipment in areas near NUMAC equipment that had been previously designated by TVA as prohibited use areas for walkie-talkies. TVA committed in a March 17, 1993, telephone call between TVA and NRC to establish additional administrative controls to prohibit the use of temporary equipment in the immediate area around the digital sensor and convertor located on the refuel floor.

ON-SITE SURVEY TVA contracted with National Technical Systems (NTS) to assist in the performance of the EMI/RFI plant surveys. NTS is widely recognized and has performed similar surveys at other nuclear facilities such as Zion, Turkey Point, and

U. S. Nuclear Regulatory Commission Page 3 DF.C. 2 3 l993 Brunswick. TVA and NTS conducted EMI/RFI surveys on the refuel floor (BFN utilizes a refueling floor common to all three units) and in the Units 1, 2, and 3 control rooms. The surveys were performed to gather the site's electromagnetic profile measurement data for comparison to GE's radiated and conducted susceptibility test data.

The surveys were performed in the immediate vicinity of the RBVRM sensors located on the refuel floor and the RBVRM chassis located in the control rooms. The surveys were performed on the refuel floor during stable plant conditions and during Unit 2 refueling activities (including fuel movement). The control room surveys were performed during startup of Unit 2 and during stable plant conditions.

NTS analyzed the survey data and determined that the EMI/RFI environmental conditions are within the tested envelope for the NUMAC RBVRM equipment. No unusual measurements were encountered and the survey showed that the BFN EMI/RFI environmental conditions are bounded by the qualification tests performed. The detailed survey results are provided in .

It should also be observed portions noted that an NRC Resident Inspector of the surveys and provided comments on the refuel floor survey in NRC Inspection Report 50-259, 50-260, and 50-296/93-18, dated June 11, 1993. The inspector noted, the test results showed that the plant's EMI environmental conditions are within the tested envelope GENERAL ELECTRIC ADDITIONAL'TESTING GE performed additional testing of the NUMAC RBVRM instrumentation to include the potential broader frequency ranges of the environment, at BFN. The GE test results are provided in Enclosure 2. The testing was conducted as described in Reference 2 with the following two exceptions:

(1) Surge Withstand Capability testing was not performed in accordance with ANSI/IEEE C37.90,.1, and (2) susceptibility testing was not performed in accordance with MIL STD-461D CS114 ~

Surge Withstand Capability testing was performed in accordance with International Electrotechnical Commission (IEC) Standard 801-5. This Surge Withstand Capability testing demonstrated that the equipment will operate at

U.S. Nuclear Regulatory Commission Page 4 DEC 23 lgg) levels which significantly exceed the measured BFN environment. Since the testing performed in accordance with IEC 801-5 showed that the NUMAC RBVRM instrumentation will operate properly in the BFN environment, TVA determined that this testing was adequate and performance of Surge Withstand Capability testing in accordance with ANSI/IEEE C37.90.1 was not necessary.

The MIL STD-461D CS114 test requirements for susceptibility testing were not used since the results of the Surge Withstand Capability testing show that these test requirements are sufficiently bounded. Enclosure 3 provides an analysis performed by NTS to show that the testing is adequate and sufficiently bounds the BFN environment.

GE's testing demonstrated that the NUMAC RBVRM instrumentation will perform satisfactorily when subjected to extended frequencies associated with high voltage electrostatic discharges, repetitive bursts of high frequency voltage transients on power and signal lines, surge pulses (such as lightning), low frequency signals coupled onto input power leads, low frequency magnetic fields, and electric fields. The NUMAC RBVRM equipment operated within specification at all times when subjected to conditions associated with these situations. The additional EMI/RFI testing shows that the NUMAC RBVRM equipment will perform satisfactorily when subjected to the BFN environment.

ADMINISTRATIVE CONTROLS The floor area surrounding the RBVRM digital sensors on the refuel floor has been clearly marked with black and yellow caution striping. Signs are conspicuously posted prohibiting the use of temporary equipment and walkie-talkies in areas around the sensors. TVA considers that these measures are adequate to preclude use of temporary equipment which could potentially impact the operation of the sensors.

The results of the plant surveys and additional testing described in this letter show that the NUMAC RBVRM equipment installed at BFN is capable of tolerating EMI/RFI interferences and is qualified for the BFN environment.

U. S. Nuclear Regulatory Commission Page 5

,DEC 23 1993 Zf you have questions, please telephone me at (205) 729-2636.

No new commitments are contained in this letter.

S'e e ro as Manager of Site Licensing Enclosure cc (See page 6)

U. S. Nuclear Regulatory Commission Page 6 DEC 23 1993 Enclosure cc (Enclosure):

Mr. R. V. Crlenjak, Project Chief U.S. Nuclear Regulatory Commission Region 101 II Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35611 Mr. J. F. Williams, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. D. C. Trimble, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 208525

TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNITS 1 g 2 p AND 3 ENCLOSURE 1 NATIONAL TECHNICAL SYSTEMS NTS TEST REPORT 60254.04-94N-1 (Note: ) The first 23 pages of this enclosure contain an analysis of EMI Main Control Room mapping data and GE RBVRM EMI Testing Data. The remaining portion presents the data collected during testing.

TENNESSEE VALLEY AUTHORITY BROGANS FERRY NUCLEAR PLANT UNITS 1q 2i AND 3 ENCLOSURE 2 GENERAL ELECTRIC GE TEST RESULTS

TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNITS 1g 2i AND 3 ENCLOSURE 3 NATIONAL TECHNICAL SYSTEMS NTS TEST REPORT 31370-94M