NRC-92-0116, Responds to Suppl 1 to NRC Bulletin 92-001, Failure of Thermo-Lag 330 Fire Barrier Sys to Perform Specified Fire Endurance Function. Eleven Areas in Plant Identified W/Subj Matl.Roving Hourly Fire Watch Patrol Established
| ML20118B830 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 09/30/1992 |
| From: | Orser W DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-92-0116, CON-NRC-92-116 IEB-92-001, IEB-92-1, NUDOCS 9210080005 | |
| Download: ML20118B830 (4) | |
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Sept erabe r 30.'1992 NRC-92-0116 U. S. Nuclear Regulatory Ccamission Attnt Document Control Desk Washington, D. C.
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References:
1)
Fetwi 2 NRC Docket No. 50-341 NRC License No. hPF-43 2)
NRC Bulletin No. 92-01. " Failure of Thermo-Lag 330 Fire Barrier Systeni to Maintain Cabling in Wide Cable Trays and Small Conduits Free From Fire Damage", dated June 24, 1992.
3)
Detroit Edison Let ter t o NRC "Det roit Edison Response to NRC Bulletin 92-01" NRC-92-0091, dat ed July 23, 1992 4)
NRC Bulletin No. 92-01, supplement 1.. " Failure of Thermo-Lag 330 fire Barrier System to Perf orm it s Specified Fire Endurance Function". dated August 28, 1992
Subject:
Det roi t Edison _Regonse to NRC Bulletin _ 92-01. Supglement 1 The purpoce.of this letter is to provide Dettuit Edison's response to Bulletin 92-01. Supplement 1 (Reference 4) which was received on August 31, 1992.
This bulletin provided notification of additional f ailut es in fire endurance testing of the Thermo-Lag 330 Fire Barrier System expanded the scope of the bulletin to include raceways, walls, ceilings, equipment enclosure. and cable traya and conduits of all
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sizess requested licensees to take the recommended actions: and required a written response within 30 days of receiving this supplement describing the actions taken in. response to this bulletin.
Accordingly, pursuant to the oath and affirmation requirements of 10CFR50.54(f). Detroit Edison has reviewed-Bu11etin-92-01 Suppicment 1 and provides the information required under the
" Requested Actions" of the' bu11(tin. As requested. ;a copy is also being submitted to the Regional Administrator. U.S. NRC Region 11I.
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USNRC September 30, 1992 NRC-92-0116 Page 2 Upon receipt of Bulletin 92-01 (Reference 2) Detroit Edison took immediate act ionc to identify the arena of the plant which have i
Thetmo-Lag 330 material and to implement the appropriate compensatory measures. Det roit Edison's responce to Bulletin 92-01 was submit ted by Reference 3.
Detroit Edi oc. '
thew identified eleven areau in the plant wheie Thetruo-Lag mat, a is installed. Two (2) c,i the_ eleven (11) areas use this material to prot ect cable t rays and conduits, and were identified in Reference 3.
Both of t hese areas have an automatic' fire detection system and in responce to Dulletin 92-01, a roving hourly fire watch partol was entablished for these tro ar
<a as a compensatory measure.
For the remaining nine (9) areas, the Thermo-Lag 330 material is used as blockout closures in fire barriers and as wall and ceiling fire barricts 2n thv Auxiliary Building.
Detroit Edison hao also established a toving hourly fire watch patrol for these additional 9-arena as a compensatory measure. These nine arean ate ao followas Betwen the Relay Room (Fire Zone 3) and the stairvell (Fire Zone
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- 9) on elevation 613'6" at column 11-17.
o Betwen The Mers anine (Fire Zone 2) and the IIVAC chase at elevation 613'6" at column 11-10.
o Between the Cable Tunnel (Fire Zone 5) and the Cable Spreading Room (Fire Zone 7) at elevation _ _603'6" at column G-13.
o Between the Cable Tut.nel Fire Zone 5) and the Cable Tray Area (fire Zone 8) et elevrtion 631'0" at column G-11.
o Between the Relay Room (Fire Zone 3) and the base 'of an liVAC chaoc at elevation 630'6" near the nouthwest corner of the Cable Spreading Room (Fire Zone 7) at column-F-13.
Between the Vent 13ation Equipment Area (Fire Zone 13) and the o
chace on elevation 659'6" at column F-9.
o Between the Division I and Division II return air f ana in the-CCINAC Room = (Fire Zone 14)- equipment on elevation 677'6" at column G-17.
o Two (2) locations on the barrier between the CCllVAC equipment room -(Fire Zone 14) and the~ cmall HVAC icom -(Fire Zone 9) on eleva tion 677'6".-
All these areas have automatic fire detection ayutems, except the-small INAC toom (Fire Zone 9) where the combustible loading is extremely low.
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- I s-USNRC September 30,1992 NRC-92-0116 Page 3 In addition to the continuing fire watches, Detroit Edison has prepared on engineering evaluation of the Thermo-Lag fire barrier material to ensure that it does not present any undue risk to the plant or advercely affect the plant's ability to achieve and maintain
,afe shutdown. The evaluation has concluded that the Thermo-Lag 330 fire barriers do not reduce the level of safety provided by the Fermi 2 Fire Protection Program and the safe shutdown capabilities are not adversely affected.
Appropriate actions to restore fire barrier integrity are being developed through an industry program being _ coordinated by NUMARC.
This program will include establishment of a test database, developnent of guidance for applicability of tests, development of generic installation guidance, and consideration and coordination of additional testing as appropriat e.
When completed, Detroit Edison will apply the results of these ef forts, if applicable, to the Thermo-Lag inst allations at Fermi 2.
If you have any questions, please contact Mr. Girija S. Shukla at (313) 586-4270.
Since rely, S
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B. Bradley (NUMARC)
T. G. Colburn A. B. Davis H. ? Phillips.
S. Stasek A
J. Silberg (Shaw, Pittman, Potts & Trowbridge)
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go USNRC Sept embe r -30, 1992 :
NRC-92-0116 Page 4 i
I, WILLI AM S. ORSER, do heteby af firm that the foregoing statenients
- e based on f acts and circumstances which are t rue and accurate to i - best of my knowledge and belief.
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WIL' LAM S. ORSER Senior Vice. President day of Al[hnl 6d_.4 4992, before me On this t
e personally appeared Wi.11iam S. Drsdr, being.first duly sworn and says that he executed the foregoing as his free act and deed.
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