ML20118B832
| ML20118B832 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 09/30/1992 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, ULNRC-2704, NUDOCS 9210080007 | |
| Download: ML20118B832 (6) | |
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$3 September 30, 1992 U.S.
Nuclear Regulatory Commission Attn:
Document Control Desk Mail Station P3-137 Washington, DC 20555 Gentlemen:
ULNRC-2704 DOCKET NUMBER 50-433 CALLAWAY PLANT FAILURE OF THERMO-LAG 330 FIRE BARRIER 3YSTEf1 T_Q_P_ERFORM ITS SPECIFIED FIRE END_URANCE FUNCT1QN_
References:
- 1) NRC. Bulletin No. 92-0:.,
dated June 24, 1992
- 2) NRC Bulletin No. 92-01, Supplement 1,
dated August 28, 1992
- 3) ULNRC-2673, dated July 23, 1992 Reference 1 requested Licensees to identify' areas of the plant which have Thermo-Lag 330 fire barrier material installed for protecting either small diameter conduit or wide trays that provide safe shutdown capability.
In our response (Reference 3) we stated that 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).
In Reference 2, Action Item 1, NRC requests Licensees to expand the scope of the Thermo-Lag 330 survey to identify all sizes of conduits and _ trays, and to include walls, ceilings, and equipment enclosures.
In response to this supplement, we note that Thermo-Lag 330 is also installed on a valve enclosure, 6 hatch covers, and in ? cable tray fire
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U.S. Nuclear Regulatory Commission Page 2 In summary, Thermo-Lag 330 is installed on approximately 700 feet of conduit, 30 feet of tray, and 400 square feet of hatch covers and valve enclosares.
The material is located in the following plant areas:
Auxiliary Building Rooms 1127, 1203, 1206, 1207, 1301, 1304, 1314, 1315, 1323, 1325, 1331, 1406, 1408, 1410, and 1504; Reactor Building elevation 2026'-0" (Fire Area RB-4) and Elevation 2047'-0" (Fire Area RB-10); and Control Building Rooms 3101 and 3401.
Action Item 2 of Supplement 1 requests that Licensees 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 inaperable fire barrier.
Licensees who have installeo The nno - Lag 3 3 0 fire barriers were requested to inform the NRC, in writing, within 30 days of receiving Supplement 1,
whether they had taken the above actions and to describe the measures being taken to ensure or restore fire barrier operacility.
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, air temperature is monitored per plant procedures.
We note that Thermo-Lag installed in the Reactor Building is a radiant energy heat shielo per 10 CFR Part 50 Appendix R and is not considered a fire barrier.
These compensatory measures will remain in place until appropriate actions to restore fire barrier operability are developed through an industry program coordinated by NUMARC.
This program will include establishment of a test database, development of guidance for applicability of tests, developtaent of generic inatallation guidance, and consideration and coordination of additional testing as appropriate.
We expect that 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
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Nuclear Regulatory Commission Page 3 new test / installation criteria; 3) replace the barrier with another approved fire barrier material; or
- 4) eliminate the need for the barrier by re-routing electrical circuits.
If you have any questions concerning this matter, please contact me.
Very truly yours,
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w Donald F.
Schncil JMC/kea l
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STATE OF MISSOURI )
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Donald F.
Schnell, of lawful age, being first duly sworn upon oath says that he is Senior Vice President-Nuclear and an ef ficer 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 behalf of said company with full power and authority co 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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Donald F.'Schnell '
Senior Vice President Nuclear SUBSCRIBED and sworn to befor? me this 80/ ______ day of. b t !} m.A n -
1992.
L t his A. 0 /'lV2 / g ban %<A 7). Pf/Jff L-NotAM Pu?uC, STATE Or 'AISSOURI MY C0VMISWN EXPIRES APRll 22, 1993 ST. LOUIS COUNTY.
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A.
Baxter, Esq.
Shaw,-Pittman, Potts & Trowbridge 2300 N.
- Street, N.W.
Washington, D.C.
20037 Dr.
J.
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Cermak CFA, Inc.
18225-A Flower Hill Way Gaithersburg, MD 20879-5334 L.
Robert Greger Chief, Reactor Project Branch 1 U.S.
Nuclear Regulatory Commission Region III 799 Roosevelt 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 l
1 White Flint, North, Mail Stop 13E21 L
11555 Rockville Pike l
Rockville, MD 20852 Manager, Electric Department Missouri Public Service Commission P.O.
Box 360 Jefferson City, MO 6S102 i
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Schnell J.
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Birk J.
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Laux M.'A.
Stiller G..L.
Randolph R. J.
Irwin' P.
Barrett C.
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Naslund J.'D.
Blosser A.
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Passwater D.
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Shafer W.
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