ML20099B293
| ML20099B293 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/23/1992 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, ULNRC-2673, NUDOCS 9207310049 | |
| Download: ML20099B293 (4) | |
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Union July 23,
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Nuclear Regulatory Commission b Attn: Document Control Desk Mail Station P1-137 Washington, D.C.
20555 ULNRC-2613 Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT FAILURE OF THERMO-LAG 330 FIRE DARRIER SYSTEM TO MAINTAIN CABLING IN WIDE CABLE TRAYS AND j
SMALL CONDUI.IS FREE FROM FIRE DAMAGE
Reference:
NRC Bulletin No. 92-01, dated June 24, 1992 NRC Bulletin No. 92-01, Action Item I requested 4
Licensees to identify the areas of the plant which have Thermo-Lag 330 fire bartier 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.
Callaway Plant has Thermo-Lag 330 fire barrier systems installed on 43 conduits (4" diameter or smaller), 10 junction boxes, and 2 cable trays (24" in width) to ensure safe shutdown capability in the event of a fire.
Thermo-Lag 330 fire barrier material is installed in the following plant areas:
Auxiliary Building Rooms 1127, 1203, 1206, 1207, 1301, 3304, 1314, 1315, 1323, 1325, 1331, 1406, 1400, 1410, anc 1504; Reactor Building Elevation 2026'-0" (Fire Area RB-4) and Elevation 2047'-0" (Fire Area RB-10); and Control 7uilding Rooms 3301 and 3401.
Action item 2 requested that Licensees should implement, in accordance with plant procedures, the appropriate compensatoiy 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.
At Callaway Plant an hourly fire watch has been established in all affected rooms outside of the Reactor Building, in accordance with plant procedures for an inoperable fire barrier.
In the Reactor Building, building air temperature is being monitored per plant procedures.
l Action Item 3 requested Licensees who have l
Installed Thermo-Lag 330 fire barriers to inform the NRC, in writing, within 30 days of receiving this bulletin, whether they have taken the above actions and to describe the i
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2 U.S. Nuclear Regulatory Commission Page 2 1
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1 measures being taken to ensure or restore fire bar11er l
operability.
Appropriate actions to restore fire barrier operability are being developed through an industry program coordinated by NUMARC.
This program will include establishment of a test database, development of guidance for applicabij'ty of tests, development of generic installation duidance, and consideration and coordination of additional testing as appropriate.
At Callaway Plant one of the following measures will be taken to ensure or restore the Thermo-Lag fire barrier operability: 1) justify the barrier as-installed; 2) upgrade the barrier to new test / installation criteria; 3) replace the barrier with another annroved fire barrier material; or 4) eliminate the need for the barrier by re-routing electrical circuits, i
If you have any questions concerning this matter, please contact me.
I Very truly yours,
~'S pub s
Donald F.
Schnell JMC/61s l
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e STATE OF MISSOURI )
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CITY OF ST. LOUIS )
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Donald F.
Schnell, of lawful age, being first duly sworn
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upon oath says that he is Senior Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on l
behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By
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hf Donald F.
Schnell Senior Vice President Nuclear 4
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1 SUBSCRIBED and sworn to before me this og (j ff g,, _ _._.
.., 1992, 4
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i tJARBA14A J. FFAFF NOIAki ft!DLIC, STATE Of MISSOURI Mr COMMISSION [1PIRES APRIL 22. 1993 ST. LOUIS COUNTY a
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T. A. Baxter Tsq.
Shaw, Pittman, Potts & Trowbridge W shingt n D C. 2 b37 Dr. J. O. Cermak i
CFA, Inc.
18225-A Flower Hill Way j
Gaithersburg, MD 20879-5334 R.
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Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 799 >>sosevelt Road Glen Ellyn, Illinois 60137 Bruce Bartlett Callaway Resident Office U.S. Nuclear Regulatory Commission RR#1 Steedman, Missouri 65077 L. R. Wharton (2)
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E21 11555 Rockville Pike Rockville, MD 20852 Manager, Flectric Department Missouri '.>ublic Service Commission P.O. Box 360 Jefferson City, MO 65102 i
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