ML19338E064
| ML19338E064 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/29/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-17, NUDOCS 8009240446 | |
| Download: ML19338E064 (3) | |
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$ I-CHATTANOOGA, TENNESSEE 374ol.'.Il d f D'4, ' E ' "' ^,lf 400 Chestr at Street Tower II 30 SEP 8 A10 : 11 August 29, 1980 Mr. James P. O'Reilly,' Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303
Dear Mr. O'Reilly:
OFFICE OF INSPE ON-AND-ENFORCEMENT BULLETIN 80-17, SUPPLEMENT 1 - RII:JP 0-259, -260, -29 M BROWNS FERRY NUCLEAR PLANT Your letter dated July 18, 1980, to H. G. Parris transmitted IE Bulletin 80-17, Supplement 1 for TVA action. Enclosed is our response to item B.2 of the subject bulletin.
If you have any questions, please call Jim Domer at FTS-857-2014.
Very truly yours, TENNESSEE VALLEY AUTHORITY Larry M. Mills, nager Nuclear Regulation and Safety Subscribed a d sworn before me this l19 ay of ~
ci,1980.
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Enclosure cc: Office of Inspection and Enforcement (Enclosure)
U.S. Nuclear Regulatory Commission Division of Reactor Operations Inspection Washington, DC 20555 i
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An Equal Opportunity Employer.
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ENCLOSURE.
-IE BULLETIN 80-17,' SUPPLEMENT NO. 1 BROWNS FERRY NUCLEAR PLANT (DOCKET NOS.- 50-259, -260, -296)
ITEM B.2
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Perform a study of. potential designs for improving the venting systems for the scram discharge volumes and submit a description to NRC by September 1, 1980. -Improvements such as providing a' redundant, independent vent for each significant volume in the system or locally. installing vacuum breakers close to each such volume should be considered (some plants already include a design which vents locally to atmosphere).
Include an estimate of the time that.would be required to accomplish these modifications in your report to be submitted to the NRC Regional Office. We have been told that meetings have already been scheduled by GE to discuss their. proposals in this area with licensees.
RESPONSE
The options presently under consideration for improving the scram discharge header vent system include crosstying the vents, venting to the clean radioactive waste (CRW) drain system, and providing a positive vent from the CRW drain system, and routing the vents to the dirty radioactive waste
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(DRW) drain system.
The vent crosstie would connect the east and west scram discharge header vents on the scram discharge header side of the vent valve. This line would allow each header to vent through the other header's vent valve and piping; therefore, no single vent valve failure or vent line failure would preclude proper system venting.
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The scram discharge header vents.to the CRW drain system would be accomplished by adding separate risers from the CRW system to an elevation above the current vent lines. The wint lines would tie in at this higher' elevation. A positive vent would be provided by either adding vacuum break 0rs on the CRW drain system side of the vent valve or venting the riser to the reactor building HVAC system. Venting the scram discharge headers to the DRW drain system would be accomplished by routing each vent line to a floor drain. This provides both a positive vent to the atmosphere and drainage for the vent line. Some type of hood arrangement would be required for the vent connection to the drain system.
The implementation of the vent modification is being coordinated with the overall scram discharge header system review and modification program. We are currently assessing equipment availability and will be able to provide scher'ule estimates in the near future.
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