ML20210V112
| ML20210V112 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/15/1997 |
| From: | Abney T TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20210V116 | List: |
| References | |
| TAC-M89680, TAC-M89681, TAC-M89682, NUDOCS 9709230054 | |
| Download: ML20210V112 (4) | |
Text
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Tennessee Valley Authortty, Post offee Boa 2000, Decar, A!abama 3%00 2000 September 15, 1997 U.S. Nuclear Regulatory Commission ATTH:
Document Control Desk Nashington, 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 VENT RADIATION MONITORING SYSTEM (RBVRM)
(TAC NOS. M89680, M89681, AND M98682)
This letter provides the test report requested by NRC in their December 11, 1996, safety evaluation (SE) and request for additional information (RAI) regarding the digital RBVRM equipment.
On April 13, 1993, the NRC Staff issued amendments to the operating licenses for Browns Ferry Units 1, 2, and 3 that reflected replacement of the analog Reactor Building Vent Radiation Monitoring System (RBVRM) with a digital system.
Interim operation of the digital system was accepted pending staff acceptance of test results which demonstrated the RBVRM system's tolerance to electromagnetic and radio frequency interferences.
In the April 13, 1993 letter, NRC requested that TVA perform several in-plant and vendor bench tests to ensure that the electromagnetic and radio frequency interferences at BFN will not cause a common mode failure of the equipment, and submit the reports to the staff, h
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s U.S. Nuclear Regulatory Commission Page 2 September !$. 1997 The NRC staff issued the SE on December 11, 1996, based on information provided by TVA concerning: (1) administrative controls regarding the use of portable radios and temporary equipment and (2) EMI/RFI testing.
In the SE, the staff concluded that administrative controls for the usa of portable radios ano temporary equipment in arens around the RBVRM equipment sensors was acceptable.
The staff also found that the surveys performed in accordance with MIL-STD-462 to be consistent with the test proposed in the March 16, 1993, letter.
Also, susceptibility testing for radiated snd electric field emissions performed in accordance with MIL-STD-462D, RS101 and RS103, and testing of conducted transient emissions in accordance with IEC Standard 801-5 was found consistent with appropriate standards and practices.
However, the staff did d
not find that susceptibility testing performed in accordance with IEC Standard 801-4 techniques to be equivalent to MIL-STD-462D, CS114.
Accordingly, the staff requested that a test in accordance with MIL-STD-462D, CS114, be performed or additional justification be provided for the use of IEC Standard 801-4, or an acceptable alternative.
In a letter issued April 10, 1997, TVA committed to test the RBVRMS in a manner consistent with MIL-STD-462D, CS114, at a severity level that ensures equipment can operate in BFN's EMI environment and submit a report to NRC.
TVA tested the RBVRMS in a method consistent with MIL-STD-462D, CS114 and has concluded that the installed RBVRM system at BFN is qualified to MIL-STD-462D, CS114, at a level of 103dBpA over a frequency of 10kHz to 400MHz.
The enclosure contains the requested test report,
" Qualification Plan and Report MIL-STD-462D, CS114, Conducted Susceptibility, Bulk Cable Injection NUMAC Reactor Building Vents Radiation Monitor TVA Browns Ferry Units 1, 2, and 3."
U..S. Nuclear Regulatory Commission Page 3 September 15, 1997 There are no commitments made in this letter.
If you have any questions regarding this, please contact me at (205) 729-2636.
Sipcerel A thcLJ y.h.Abney Manager of ab 'ng and Indus'ry Af airs Enclosure cc: Mr. Mark S.
Lesser, Branch Chief U.S. Nuclear Regulatory Commission Region II 61 Forsyth Street, S.W.,
Suite 23T85 Atlanta, Georgia 30303 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
s ENCLOSURE TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)
UNITS 1, 2, AND 3 RESPONSE TO THE NUCLEAR REGULATORY COMMISSION REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING TECHNICAL SPECIFICATION (TS) NO. 316 - TVA'S PROPOSED UPGRADE OF THE REACTOR BUILDING VENT RADIATION MONITORING SYSTEM QUALIFICATION PLAN AND REPORT MIL-STD-462D, CS144 CONDUCTED SUSCEPTABILITY, BULK CABLE INJECTION NUMAC REACTOR BUILDING VENTS RADIATION MONITOR (RBVRM)
TVA BROWN.$ FERRY UNITS 1, 2, AND 3 (SEE ATTACHED)
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