ML20106C662
| ML20106C662 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Sequoyah  |
| Issue date: | 09/30/1992 |
| From: | Burzynski M TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, NUDOCS 9210060289 | |
| Download: ML20106C662 (4) | |
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SEP301D U.S. Nuclear Regu13 tory Concission ATTH: Document Control Desk Washington, DC 20555 Contlement
- In the Matter of
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Docket Nos. 50.250 50-327 Tsnnessee Valley Auttority
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50-260 50-328
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50-296 RESPONSE TO NRC BULLETlN 92-01, SUPPLEMENT 1, FAILURE OF THERMO-LAG FIRn BARRIER SYSTEM TO PERFORM ITS SPECIFIED FIRE ENDURANCE FUNCTION, SEQUOYAH NUCLEAR PLANT (SON) AND 11ROWNS FERRY NUCLEAR PLANT (BFN)
On August 28, 1992, NRC issuad Bulletin 92-01, Supplement 1.
The supplement requests the Licensee.first, to identify _the areas-of the plant which have Thermo-Lag 330 fire barrier.natorial installed and dstormine the 1lant areas which use this material for the protection and separation:
of the safe shutdown capability, and secoud to-implement appropriate compensatory measures consistent with those that would-be Implemented for inoperable fire barriers.
On September 16,'1992, NRC issued a letter-requesting thatIBFM~uubmit a j
revision-to the response to Bulletin 92 01 issued July-31, 1992.
In the TVA letter dated July 31, 1992, DFN relied.on a fire Lazards analysis to demonstrate low fire damage potential to Thermo-Lag protected cables and did not establish fire watches for those areas..
l-This let.ter responds to both NRC Bulletin 92-01, Supplement 1, and the September 16, 1992, request'for the revision of-the initial TVA response for DFN.
Thermo-Lag fire barrier system has been utilized at BFN for the protection
- and separation'of safe shutdown capability on conduits and junction boxes. These installations are located in units.1,.2, and 3 Reactor.
Buildings, Shutdown Board Rooms Intake Pump Station, and the Radwaste' Pipe Tunnel.
BFN does not hue any thermo-Lag protected cable trays.
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U.S. Nuclear Regulatory Connission Page 2 SEP S 01992 In the lotter issued Jaly 31, 1992, TVA stated that BFN had implemented fire watches for all Thermo-Lag protected conduits one inch and smaller.
As a result of Supplement 1, DFN has implemented additional compensatory measures in accordance v3th technical specifications for Thermo-Lag protected conduit, junction boxes, and areas where Thermo-Lr, is ut2112ed for mmparteestation.
In response t, the original bulletin, SQN identified t's installation areas of Thermo-Lag and ensured that existing fire watch patro2s required by SQN technical specifications included these are.,;.
As a result of Supplement 1, SQN again reviewt, the Thermo-Lag installations and all the Thermo-Lag had been previou11y identified.
Therefore, no additional compensatory actions are required.
Appropriate actions to verify or restore fire barrier operability are being developed through an industry program being coordinated by UUMARC.
This program vill include establishment of a test dattbase,'dovelopment of guidance for applicability of tests, development of generic installation guidance, and consideration and coordination-of additional testing as appropriate.
TVA will apply the results of these efforts, when completed, to the TLarmo-Lag installations within the scope of Bulletin 92-01 and Supplement 1.
TVA may also develop its own program for resolutien of this issue to support specific schedule needs for units under construction.
The enclosure contains the commitment made in this letter.
If you have any questions concerning this response, please telephone Ralph H. Shell at (615) 751-2474 Sincerely, s
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G.
,h'3MarkJ. Burzynski sq U
Manager
' Nuclear Licensing and Regulatory Affairs Enclosure cc:
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U.S. Nuclear R'equlatory Cownission Page'3 SEP 3 0F1992 cc-(Enclosure):
Mr. D. E. LaBarge, Eroject Managet U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, Maryland 20852 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama-35609-2000 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 Mr. Thierry M. Ross, Project Manager U.S. Nuclear; Regulatory Commission One White Flint North 11555.Rockv111s Pike
' Rcckv1116 Maryland 20852 l
Mr.
B.
.41 son, Project Chief l-U.C. Nuclear Regulatory Commission Region II.
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 f
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E11 CLOSURE LIST OF COMMITMENTS As previously stated in the response to NRC Bulletin l2-01, TVA will 1.
apply the results of the TVA developed program or the ladustry program being coordinated by IIUMARC to the Thermo-Lag installbtions within the scopo of Bulletin 92-01 and Supplement 1.
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