ML18036B336
| ML18036B336 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/21/1993 |
| From: | Salas P TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-16, NUDOCS 9306300077 | |
| Download: ML18036B336 (10) | |
Text
CCELERATED DOCUMENT MSTRIUTIONSYSTEM REGULATE INFORMATION DISTRIBUTIOlYSTEM (RIDE)
ACCESSION NBR:9306300077 DOC.DATE: 93/06/21 NOTARIZED:
NO DOCKET FACIL:50-260 Browns'erry Nuclear Power Station, Unit 2, Tennessee 05000260 AUTH.NAME AUTHOR AFFILIATION SALASFP.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Advises of installation of hardened wetwell vent,per GL 89-16.Automatic drain valves installed in reactor bldg s
yard. Routine insp on 930417-0514 monitored const of vent throughout Cycle 6 outage.
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TITLE: TVA Facilities Routine Correspondence NOTES:
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LTTR 13 ENCL
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Tennessee Valley Authority, Post Office Box 2000. Decatur. Alabama 35609 JOB Ri 1993 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of Tennessee Valley Authority Docket Nos.
50-260 BROWNS PERRY NUCLEAR PLANT (BFN) - COMPLETION OF THE INSTALLATION OF A HARDENED WETWELL VENT ON BFN UNIT 2 IN
RESPONSE
TO GENERIC LETTER 89-16 This letter provides notification of the installation of the Hardened Wetwell Vent at BFN Unit 2.
TVA committed to provide this notification as part of the Unit 2 Cycle 6 outage completion letter (Reference 1).
TVA committed to install a hardened vent in response to Generic Letter 89-16 (Reference 2).
The required operating procedures are in place and the required training has been performed.
Reference 3 documents a meeting between NRC and TVA to review the design and operation of the BFN hardened vent.
In response to NRC concerns, TVA stated that float valves would be installed on two of the three drain lines to eliminate the need for local operator action.
A third drain valve, located within the plant stack was still being evaluated to determine if it could be opened during an accident or left normally open without increasing ground level radioactive releases beyond regulatory limits during design basis events.
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U. S. Nuclear Regulatory Commission SN Ri ~%3 Since that meeting,. automatic type drain valves (steam traps) have been installed, one in the Reactor Building and one in the yard.
This eliminated the need for local operator action.
The manual operator action to open the stack drain valve has also been eliminated by maintaining the valve in a normally open position.
Potential ground level release through the stack drain are prevented by:
- 1) Qualifying the exposed piping in the stack and the Radwaste Building as Seismic Category 2 for pressure boundary retention, 2)
The potential for radioactive gases to be released from an assumed break in the buried portion of the stack drain has been determined to be incredible, and
- 3) Taking credit for the water seal provided by both the stack sump and the off-gas condensate sump.
Additionally, a routine resident inspection of BFN was conducted on April 17, 1993 through May 14, 1993.
During this inspection, the inspectors reviewed the commitments that were to be completed prior to startup from the Unit 2 Cycle 6
refueling outage.
As documented in the referenced Inspection Report.(Reference 4), the inspectors monitored the construction of the hardened vent throughout the outage.
During this latest inspection period, the inspection effort focused primarily on post modification testing.
Proper functioning of the various valves, indications and alarms associated with the system were observed.
In order to verify a clear flow path, the inspectors observed the injection of helium into the piping within the reactor building and the detection of the gas as it exited the hardened vent in the stack.
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U.S. Nuclear Regulatory Commission JN Ri BS There are no additional commitments contained in this letter.
If you have any questions, please telephone me at (205) 729-2636.
Sincerely, Pedro Salas Manager of Site Licensing
- ccrc NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637
- Athens, Alabama 35611 Mr. Thi.erry M. Ross, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockvi.lie, Maryland 20852 Mr. R.
V., Crlenjak, Project Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Sui.te 2900 Atlanta, Georgia 30323.
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'U.S..Nuclear Regulatory Commission JUN 2 f. 833
References:
1)
.TVA letter to NRC, dated May 24,
- 1993, Completion of Commitments for Unit 2 Cycle 6
Outage and Response
.to Related Issues 2)
TVA letter to NRC, dated October 30,
- 1989,
Response
to Generic Letter (GL) '89-16 "Installation of Hardened Wetwell Vent" 3)
NRC letter to TVA, dated December 30) 1992@
Summary of the December 16, 1992 Meeting Regarding Design. and Operation of the Browns Ferry Hardened Wetwell Vent 4)
NRC letter.to TVA, dated June 11,
- 1993, NRC Inspection Report Nos. 50-259/93-18, 50-260/93-18, and 50-296/93-18
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