ML20113H596
| ML20113H596 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Sequoyah  |
| Issue date: | 07/31/1992 |
| From: | Burzynski M TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9208050068 | |
| Download: ML20113H596 (4) | |
Text
'
e Tennessee V#ey Aot%v4 01 Mykei Street, Cravvy.ga Tennessee 37402 July 31, 1992 U.S. Nuclear Regulatory Commission ATIN:
Document Control Desk Washington, DC 20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-259 50-327 Tennessee Valley Authority
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50-260 50-328
)
50-296 RESPONSE TO NRC BULLETIN 92-01, " FAILURE OF THERMO-LAG 330 FIRE BARRIER SYSTEM TO MAINTAIN CABLING IN WIDF CABLE TRAYS AND SMALL CONDUITS FREE FROM FIRE DAMAGE" - SEQUOYAH NUCLEAR PLANT (SQN) AND BROWNS FERRY NUCLGAR PLANT (BF"'
TVA has reviewed the requirements of the subject bulletin and this letter constitutes our not*fication that SQN and BFN have identified the installed Thermo-Las 330 fire barrier systems as required by Bulletin 92-01.
For each plant, the following comporsatory measures have been taken:
BFN placed fire watches on Thermo-Lag protected conduits one inch and smaller.
BFN does not have any Thermo-Lag protected cable trays.
Fire Hazards Analyses (FHA) have been performed for conduits less than four inches protected by Thermo-Lag. In areas where FRA have demonstrated low fire damage potential to Thermo-Lag protected cables, fire watches are not used. The FHA are based on the guidance of Generic Letter 86-10.
The FRA and additional compensatory measures are intended to serve as an interim measure. Additional FHA may be prepared to enhance or relax compensatory measures as appropriate.
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- U.S. Nuclear Regulatory Commission Page 2 July 31, 1992 Because the SQN Combustible Loading / plant FHA is in-the process of being l
- updated and revised, and becauso fire watcher had previously been established for penetration seals, SQN has not performed area specific
- FHA. :SQN has confirmed their existing penetration seal fire watch patrol program includes Thermo-Lag protected conduits and cable trays. SQN may use FHA to enhance or relax compensatory measures as appropriate, after their Combustible I.oading/ plant FRA is updated and revised.
Appropriate actions to verify or restore fico barrier operability are
- being developed through an industry program being coordinated by NUMARC.
~This program will include establishment of a test database, development of guidance for applicability of tests. development of generic installation guidance, and consideration and coordination of additional testing as appropriate. TVA will apply the resul'.s of these efforts, when completed to.the Thermo-Las installations within the scope of Bulletin 92-01.
TVA may-also develop its own program for resolution of this issue to support specific schedule needs for units under construction.
The enclosure contains the commitment umde in this letter.
If you have any questions regarding this response, please get in touch-with Ralph H. Shell at (615) 751-2474 in Chattanooga.
Sincerely, ttb
[j'/f it
' Mat'k
. Burzynski Manager Nuclear Licensing and Regulatory Affairs Enclosure cc:
See page 3 o
m
.,f U.S. Nuclear Regulatory Commission Page 3 July 31, 1992 cc (Enclosure):
Mr. D. E. LaBargo, Project Manager 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 lgou Ferry Road Soddy Daisy, Tennessee 37379 Mr. Thierry M. Ross, Project Manager U.S. Nuclear Regulatory Connission One White Flint North 11555 Rockville Pike Rockville, Maryland 20852 JU.S. Nuclear Regulatory Commission Ono White Flint North 11555 Rockville Pike Rockville, Maryland 20852 4
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' s' ENCLOSURE LIST OF COMMITMENTS 1.
TVA will apply the results of the TVA devolcped program or the industry program being coordinated by NUMARC to the Thermo-Lag installations.within the scope of Bulletin 92-01, 9