ML20118B587
| ML20118B587 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/28/1992 |
| From: | Shelton D CENTERIOR ENERGY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 2088, IEB-92-001, IEB-92-1, NUDOCS 9210050182 | |
| Download: ML20118B587 (4) | |
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. EhnEFbGY Donald O. Shelton 300 MadF,on Avenue Vee President Nuciear Toledo, OH 436520)01 Davis Besse (419)2G2300 Docket Number 50-346 License Number NPF-3 Serial Number 2088 September 28, 1992 United States Nuclear Regulatory Commission Document Control Desk Vashington, D.C.
2G555 Subj ec t :
Fire Protection: Response to NRC Bulletin 92-01, Suppleinent 1, Failure of Thermo-Lag 330 Fire Barrier System to Perform its Specified Fire Endurance Function Gentlemen:
To3 ado Edison (TE) received Nuclear Regulatory Commission (NRC,Bulletin 92-01, Supplement 1, " Failure of Thermo-Lag 330 Fire Barrier System to Perform its Specified Fire Endurance Function", on August 31, 1992 (TE Log Number 1-2726).
Bulletin 92-01, Supplement 1, provided notification of additional apparent failures in tire endurance testing associated with the Therme-Lag 330 fire barrier system, requested that all operating reactor licensee take NRC-recommended actions and l
tequired that a vritten response be provided to the NRC describing the actions taken associated with Bulletin 92-01, Supplement 1.
This lett er provides TE's response to Bulletin 92-01, Supplement 1, as applicable to the Davis-Besse Nuclear Power Station (DBNPS).
This letter supplements TE's response to NRC Bulletin 92-01 submitted on July 29, i992 (TE letter Serial Number 2076).
i NRC Requested Action 1.
For those plants that use either 1-or 3-hour pre-formed Thermo-Lag 330 panels and conduit shapes, identify the areas of the plant which have Thermo-Lag 330 fire barrier material installed and determine the plant areas which use this aaterial for protection and separation of the safe shutdown capability.
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Docket Number 50-346 License Number NPF-3 Serial Number 2088 l
Page 2 Action raken 1.
In addition to the ten rooms identified in TE's July 29, 1992 letter that have conduit with the Thermo-Lag 330 fire barrier system, TE has determined that there are eleven rooms with structural steel protected by the Thermo-Lag 330 fire barriar system (three of these rooms clso have conduit protected by the Thermo-Lag 330 fire barrier system).
Additionally, the Thec,no-Lag 330 fire barrier system is used by TE to protect fire dampers in i
five rooms (see Attachment for a listing of the rooms where the Thermo-Lag 330 fire barrier system is used).
i NRC Requested A;iion f
2.
In those plant areas in which Thermo. Lag fire barriers are used in racevays, valls, ceilings, equipment enclosures, or other areas to protect cable trays, conduits, or separate redundant safe shutdown j
functions, the licensee should implement, in accordance with plant procedures, the appropriate compensatory measures,.such as fire watches, consistent with those that vot ld be implemented by either the nlant technical specifications or the operating license for an incoerable fire barrier. These compensatory measures should remain i r,.. lact until the licensee can declare the fire barriers operable j
oi the basis of applicable tests which demonstrate successful 1-or 3-hour barrier performance.
l Action Taken i
2.
On September 1, 1992, TE established hourly fire watch patrols as compensatory measures in the to us where the Thermo-Lag 330 fire barrier system is used for the g otection and separation of the safe shutdown capability. These compensatory actiens are consistent with those that vould be implemented by the DBNPS Technical Specifications for an inoperable fire barrier.
l As the qualification of the Thermo-Lag 330 fire barrier system is an
'_ unresolved geaeric industry concern, TE intende to continue to follow, l
evaluate, and parti p te in industry activities to resclve this issue, i
If you have any questions, please contact Mr. R. V. Schrauder, Manager - Nuclear Licensing, at (419) 249-2366.
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Very try y yours,
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I-cc: a E. Bradley, NUMARC A. B. Davis, Regional Administrator, NRC Region III J. B. Hopkins, NRC/NRR DB-1 Senior Project ManaEer i
V Levis, NRC Region III, DB-1 Senior Resident Inspector Utility Radiological Safety Board k
1 Docket' Number 30-346-l
' License Number NPF -
Serial Number 2088 l-Attachment Page 1 g
i List cf Rooms at the Davis-Besse Nuclear Power Station l
Using.Thermo-Lag 330 Fire Barrier System 8
to Protect and Separate the Safe Shutdown Capability i-Room No.
Description Application 53 Service Vater Valve Room Conduit f
l 105 Emergency Core Cooling System conduit
? ump Room 1-1 Structural steel L
110/110A Corridor-Structural steel 1i 113A*
Hatch Area Conduit Structural steel li' 114 Miscellaneous Vaste Monitor Conduit Tank and Pump Room Structural steel 225 Make-up Puiup Room Structural steel 304 Corridor Structural steel l
313 Hatch Arca Conduit 314 No. 4 Mechanical Penetration Room
-Conduit j
323 High Voltage Switchgear Room B Conduit i
l 324 Auxiliary Shutdown Panel and Transfer Svitch Room Londuit t
l 325--
High Voltage Switchgear Room A
. Structural steel l
l 328 Component cooling Vater Heat Exchanger and Pump Room Conduit i.
331 Auxiliary Steam Boller Room-Damper l.-
400 Equipment Hatch Area Passage Structural steel 401 Fuel Handling-Exhaust-Unit Room Structural steel 404 Corridor Structural steel l
427 No. 2' Electrical Penetration Room Conduit-l 428 Lov Voltage Switchgear Room 1F-Bus Structural steel L
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Docket Number-50-346-License Number NPF-3.
Serial Number 2088 Attachment Page 2 List of. Rooms at the Davis-Besse Nuclear Power Statien Using Thermo-Lag-330 N re Barrier System to Protect and Sepatate the Safe Shutdovn Capability Room No.
Descripticn Application 431 Turbine Area dempet 504 control Room Kitchen damper 507 Shift Supervisor Office damper 509 Control Rootn Passage
_ damper
- Continuation of same ennJult from 'ssom 105 i
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