ML20137S353
| ML20137S353 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/10/1997 |
| From: | Abney T TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-M89680, TAC-M89681, TAC-M89682, NUDOCS 9704150093 | |
| Download: ML20137S353 (4) | |
Text
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Tennessee Valley Authority, Post Office Box 2000. Decatur, Alabane 35609-2000 April'10, 1997 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) UNITS 1, 2, AND 3 - RESPONSE TO THE NUCLEAR REGULATORY COMMISSION (NRC) REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING TECHNICAL SPECIFICATION (TS) NO. 316 - TVA'S PROPOSED UPGRADE OF THE REACTOR BUILDING VENTILATION RADIATION MONITORING SYSTEM (TAC NOS. M89680, M89681, AND M98682)
This letter provides TVA's response to the request for additional information sought by the NRC Staff in their December 11, 1996 safety evaluation (SE).
NRC requested TVA provide a schedule and description of a susceptiblilty test that will fulfill one of the commitments made by the letter issued March 16, 1993.
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On April 13, 1993, the NRC Staff issued amendments to the j
operating licenses for Browns Ferry Units 1, 2,
and 3 that
[
reflected replacement of the analog Reactor Building Ventilation Radiation Monitoring System (RBVRM) with a digital system.
Interim operation of the digital system was p y
accepted pending staff acceptance of test results which demonstrated the RBVRM system tolerance to electromagnetic and radio frequency interferences.
NRC requested that TVA perform a survey of the electromagnetic and radio frequency 9704150093 970410 fDR ADOCK 05000259 PDR ljlfll[Efl!lll!!hfi
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Nuclear Regulatory Commission Page 2 April 10, 1997 interferences at BEN and submit a report to the staff.
The staff also noted that the appropriate design changes were to be implemented during the BFN Unit 2 Cycle 6 Refueling Outage.
By letter issued March 16, 1993, TVA proposed testing that would resolve NRC questions surrounding the digital equipment.
On December 23, 1993, TVA submitted test reports demonstrating satisfactory electromagnetic radio frequency interference tests and onsite surveys for the digital RBVRM equipment.
The letter also described administrative controls that are in place that assure that interference from portable radios and temporary equipment in the areas of the RBVRM l
)
equipment do not affect system operation.
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TVA performed the proposed susceptibility testing as described by the March 16, 1993, letter with the exception of j~
the following: (1) Conducted Transient Emissions was not performed in accordance with American National Standards j
Institute / Institute Of Electrical and Electronic Engineers 4
(ANSI /IEEE) C37.90.1, instead testing was performed in accordance with International Electrotechnical Commission i
(IEC) Standard 801-5.
(2) Conducted continuous signal l
emissions testing was not performed in accordance with Military-Standard (MIL-STD)-462D, CS114.
However, it was performed in accordance with a similar testing method, IEC Standard 801-4.
4 The NRC staff issued a SE on December 11, 1996, based on information previously provided by TVA.
In the SE, the staff concluded that TVA's administrative controls for the use of portable radios and temporary equipment in areas around the i
RBVRM equipment sensors were acceptable.
The staff also found that the surveys done in accordance with MIL-STD-462 to be consistent with the test proposed in the March 16, 1993,
- letter, j
Susceptibility testing for radiated and electric field emissions performed in accordance with MIL-STD-462D, RS101 and RS103, and testing of conducted transient emissions in l
accordance with IEC Standard 801-5 was found consistent with j
l appropriate standards and practices.
However, the staff did not find that susceptibility testing performed in accordance i
with IEC Standard 801-4 techniques to be equivalent to MIL-STD-462D, CS114.
Therefore, the staff requested that a test in accordance with MIL-STD-462L, CS114, De performed or
-U.S.
Nuclear Regulatory Commission Page 3 April 10, 1997 provide additional justification for the use of IEC Standard 801-4, or an acceptable alternative.
TVA will test the RBVRMS consistent with MIL-STD-462D, CS114 at a severity level to ensure equipment operation in BEN's EMI environment, with adequate margin.
TVA will provide the test results by September 15, 1997.
The enclosure contains the commitment made in this reply.
If you have any questions regarding this reply, please contact me at (205) 729-2636.
S peerely f
y s.
Manager of Li in and Indust y Affai s Enclosure cc:
See page Mr. Mark S. Lesser, Branch Chief U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.
Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611 Mr. J.
F. Williams, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852
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_._-_..._m ENCLOSURE TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)
UNITS 1, 2,,AND 3 RESPONSE TO THE NUCLEAR REGULATORY col + FISSION REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING TECHNICAL SPECIFICATION (TS) NO. 316 - TVA'S PROPOSED UPGRADE OF THE REACTOR BUILDING VENT RADIATION MONITORING SYSTEM COM1ITMENT TVA will test the RBVRMS consistent with MIL-STD-462D, CS114 at a severity level to ensure equipment operation in BFN's EMI environment, with adequate margin.
TVA will provide the test results by September 15, 1997.
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