ML20113H524
| ML20113H524 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/29/1992 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, NUDOCS 9208040211 | |
| Download: ML20113H524 (2) | |
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%nwoo. PA 150 n Na w.e.n m en w e Enw.t ns, w e um i4 ' 4 : M i 's U.
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Huclear Regulatory Commission
/ Attn:
Document Control Desk Washington, DC 20555 Refe/ence:
Beaver Valley Power Station, Unit No. 1 and No. 2 DV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 URC Bulletin 92-01 Gentlemen:
Attached is our response to NRC Bulletin 92-01, " Failure of Thermo-Lag 330 Fire Barrier System to Maintain Cabling in Wide Cable Trays and Small Conduits Free of Fire Danage".
This provides the status of actions taken to meet the requirements of the Bulletin.
Appropriate actions to restore fire barrier operability are being developed through an industry program being coordinated by NUMARC.
This program will include establishment of a
test
- 'tabase, development of generic installation
- guidance, and
'nsideration and coordination of additional testing as 61oroprjate.
We will apply the results of these efforts, when
.apletre, to the Thermo-Lag installations within the scope of U. lletin 92-01.
If you have any questions concerning this response, please contact John Maracek at (412) 393-5232.
Very truly yours,
. l Q,. -
D.
Sieber cc:
Mr.
L.
W.
Rossbach, Sr. Resident Inspector 1.
T.
T.
Martin, NRC Region I Administrator Mr. Charles W.
Hehl, Director, Division of Reactor Projects, Region I Mr. A.
W.
De Agazio, Project Manager Mr.
R.
Saunders (VEPCO) i
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I DUQUESNE LIGHT COMPANY' i
uuclear Group 1
Beaver Valley Power Station Units 1 & 2 ATTACHMENT Reply to NRC Bulletin 92-01 Recuested Actions:
All holders of operating licenses for nuclear power reactors, immediately -upon receiving this bulletin, are requested to take the following actions:
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 material for protecting either small diameter conduit or wide trays. (widths greater than 14 inches) that provide safe shutdown capability.
2.
In those. plant areas in which Thermo-Lag fire barriers are used-to protect wide cable. trays, small conduits, or both, the licensee should implement, in accordance-with plant procedures, the appropriate compensatory
- measures, such as fire watches, consistent with'those which would be implemented by-either the plant technical specifications or the operating license.for an inoperable fire barrier.
3.
Each
- licensee, within 30 days of receiving this bulletin, is required Eto -provide e, written notification stating whether it has or -does not have Thermo-Lag 330' fire barrier systems installed'.in: its facilities.
Each licensee.who has installed-Thermo-Lag 330 fire ~ barriers _is. required to inform the NRC, in t
z writing, :- whether
--it has taken the above actions andi is-
' required to describe the measures being taken to. ensure or restore fire barrier operability.
Bessonse:
TSI-- Thermo-Lag-330 fire barrier material was installed at
._ Beaver Valley PowerL Station (BVPS)-
Unit _2 for protecting electrical cable in conduit-in order to meet the requirchents of Section III.G of Appendix R to 10CFR50. _The TSI Thermo-Lag material was) not installed-on any cable trays.
BVPS Unit 1 does not-utilize-TSI Thermo-Lag material for meeting Appendix R' fire' protection requirements.
~.-. _ _ _ - - _...
Attachment Reply to URC Bulletin 89-02 Page 2 Nine
_(9) fire areas at BVPS Unit 2
are affected by this Bulletin.
Based on previous reviews of NRC Information Notices on this subject (IEN
- 91-47 and
/91-79),
it was concluded that the TSI Thermo-Lag 1-hour and 3-hour fire barrier material was properly installed.
The material was installod and verified by qualified individuals, adjoining sections were
" buttered" or sealed with approved caulking
- material, and the material was properly installed with the stress -skins intact in accordance with approved installation procedures.
Based on our review of the nine (9) areas at BVPS Unit 2 where TSI _Thermo-Lag material is installed-on small size conduit (less than five (5) inches in diameter),
the following conclusions were formulated:
1.
The fire loading for the affected areas are not significant enough to produce a
fire approaching the severity of a
fire
- test, given the configuration and existing fire protection features provided for each of the areas.
2.
BVPS has programs to control ignition sources and transient -combustibles which minimize the probability of a fire event in-these areas.
3.
All nine (9) fire areas of concern are protected by an early
- warning, smoke detection system which alarms locally and in the Control Room to allow for quick response from the plant Fire Brigade to minimize damage.
4.
In addition to the early warning detection system, four (4) of the effected fire areas are provided with an automatic fire suppression system to further mitigate the effects of a fire event.
E,-
As-noted in the Bulletin, the recent fire tests conducted.
on cable' enclosed in conduit (June 17, 1992) demonstrated i
that none of the cables experienced a circuit integrity failure.
That is, the circuits continued to perform their intended function and remained operable throughout
- the fire endurance test.
6.
All-cabling affected by this issue is qualified to IEEE l
Standard 343-1974.
The environmental qualifications ( f- -
L tampera' oi range _from 340-390*P which was not rearte?
L
-ratil approximately_ 40 minutes into the fire tnrt' conducted on June 17, 1992, for cables in conduit.
l l1 -_ _
t A'tachment t
~
Reply to NRC Bulletin 89-02 Page 3 l
Compensatory measures.were implemented in the form of four (4) hour roving patrols for the nine (9) affected areas.
This was i
determined to be adequate until such time as permanent corrective measures can be implemented or the scope of the issue for "small size conduit" can be ecsolved.
We have reviewed this information with our NRC Resident Inspector and NRC Preject Manager.
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1 COMMONWEALTH OF PENNSYLVANIA)
)
SS:
COUNTY OF BEAVER.
)
_f day of
\\ (4
- 1992, On this NW/ Tr IMERL a Notary Public in and for said before me,
- Commonwealth and County, personally appeared J.
D.
Sieber, who being duly sworn, deposed, and said that (1) he is Vice President - Nuclear
- of - Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his t
knowledge, information and belief.
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