ML20010F782

First Interim Deficiency Rept Re Fireproofing Matl Applied to Conduit,Initially Reported on 810804.Ampacities of Power Cables Installed in Conduits Being Evaluated Where Fireproof Coating Was Inadvertently Applied.Next Rept by 811021

ML20010F782
Person / Time
Site:	Bellefonte
Issue date:	09/03/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109110322
Download: ML20010F782 (2)

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,_ TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II September 3, 1981 g BLRD-50-438/81-53 n- 4 =

BLRD-50-439/81-55 /9  %  ;

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" 9 Mr. James P. O'Reilly, Director 1-

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Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission b; SEP 101981

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Region II - Suite 3100 ca.wmioit s 101 Marietta Street sb; {l/

a Atlanta, Georgia 30303 kj ,

Dear Mr. O'Reilly:

BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - FIREPROOFING MATERIAL APPLIED TO CONDUIT - BLRD-50-438/81-53, BLRD-50-439/81 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector R. V. Celenjak on August 4, 1981 in accordance with 10 CFR 50.55(e) as NCR 1528. Enclosed is our first interim report. We expect to submit our next report by October 21, 1981.

If you have any questions concerning thia matter, please get in touch with D. L. Lambert at FTS 857-2581.

Very truly yours, TENNESSEEE VALLEY AUTHORITY t m nf110 gom L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 i

8109110322 810903 g,i PDR ADOCK 05000*58 S PDR An Equal Opportunity Employer

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ic ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 FIREPROOFING MATERIAL APPLIED TO CONDUIT 10 CFR 50.55(e) ,

BLRD-50-438/31-53, BLRD-50-439/81-55 FIRST INTERIM REPORT Description of Deficiency In Bellefonte Nuclear Plant's cable spreading room, exposed surfaces of-steel require application of a fireproof co=.tir.g. There are four voltage level circuits which are routed into this room. In order from lowest to highest voltage, these are identified as V1, V2, V3, and V4 circuits.

These circuits are housed inside steel conduits. There are cases where conduits were installed before the design requirement to coat the exposed steel was implemented. In most cases, horizontal runs of conduits cross perpendicularly to and are attached to the horizontal steel beams, and in other cases the conduits penetrate the floor barrier. The fireproof coating was also applied to conduits at these locations.

However, before the fireproof coating application, it was determined that conduits containing voltage level V1, V2, and V3 circuits and their conduit supports could be coated with the appropriate thickness of fireproofing material. The V1, V2, and V3 voltage levels are used for ,

instrumentation and control level circuits. These circuits are of low energy application and not subject to heat buildup. Conservatively, it was decided that conduits containing power cables should not be coated since the coating may cause an overheating problem in the installed cables. Inadvertently, some conduits containing voltage level V4 circuits were partially coated with Pyrocrete 241, a fireproofing material.

Interim Prorress TVA is evaluating ~ the ampacities of power cables installed in conduits where the fireproof coating was inadvertently applied. Using the thermal conductivity of the fireproof material from the vendor's information and the full load current of the circuits involved, this evaluation will determine if the ampacities of the cables are acceptable.

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