ML20084T942

LER BFRO-50-259/765W:on 760504,fire Occurred in Drywell. Caused by Welding Slag Igniting Breathing Air Hose & Electric Extension Cord.Sys Operating Ability Not Damaged

ML20084T942
Person / Time
Site:	Browns Ferry
Issue date:	05/20/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20084T946	List: ML20084T942 ML20084T947
References
LER-BFRO-50-259-765, NUDOCS 8306240322
Download: ML20084T942 (4)

Text

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f 7 89 10 80 PUBLICITY 5 l COPY of wfDAmo47/Or/ Aft.c%;rEO 70 put3t tc MAY 7. / 974 ATTAC H E D. I 1

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7 89 DE I 7 89 i l 80 l NAME:

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- EVENT DESCRIPTION

,,BFAO-50-259/765W During modification of existing grating in unit 1 drywell on elevation 563 to adapt grating to conform with previous modifications made in the drywell, slag fell down to elevation 549 and ignited four lengths of byeathing air hose in a plastic wrapper and a length of electric extension cord / Apparently the slag fell onto a 16-inch I-beam installed on a 45-degree angle and ran down this beam to elevation 549 Ignition occurred after the craftsmen installing '

the grating left the drywell at 11:45 a.m.

At approximately 12 noon on May 4, 1976, it was reported to the fire watch on duty that there was smoke in unit 1 reactor building in the vicinity of the TIP room. The fire watch went to this location, but he was unable to find the source of the smoke and called the control room requesting operator assistance.

Three operators arrived al ost immediately and determined that the smoke was coming from within unit 1 drywell. One operator sounded the fire alarm while the other two entered the drywell to determine the source of the smoke. It has been determined that, al.t morning long, work had been in progress on drywell elevation 563 fitting grating which required burning and welding. A welding permit had been issued to cover this work.

- The fire was pronptly extinguished following the arrival of the fire brigade.

It was suppressed using dry chemicals and demineralized water. There was no damage or determent of any system's operc. ting ability as a result of this event.

Corrective action proposed and/or implemented as a result of this occurrence is as follows.

1. Unit 1 drywen has been cleaned to remove smoke residue. Cleanup documentation is available in EF MMI 1.1-B.

2. Job orientation class for all new foremen.

3 Fire watch shall be required in attendance at all welding sites except where a foreman decides that a fire watch is not required and has the concurrence of a senior licensed operator or a certified Quality Control inspector. ,

Additional measures which will be implemented to strengthen the fire control program are:

1. Review by plant staff of each fire event.

2. Phone checkout semiannually.

All corrective action will be fully implemented prior to fuel loading.

I i

1 INFObTION 'kELEASED 7o 81 MAy 7,1976 cc:

1 1*GF l TVA reports a minor. fir'e which occurred at Brc ens Ferry I uclear gag . I Plant unit 1 at approxinstely 12 noen on Tuesh y, Pay 4, 1976. Tne fire occurred when some velding sleg fell on cone air ho es causing 1

. then to s= older. l t

L The plant fire alarn was scanded and the plant fire brigade promptly responded. Extinguishment measures were taken, with no annge other than smoke residue ,/nich is being c1 caned up. I*o outside assistance was needed or called for.

. I I

It is not expected that this event vill cause any delay in returning [

the Browns Ferry units to service.

t.

s Bro ins Ferry unita 1 and 2 are in the final stages of restoration and i testing follosing the fire which occurred F. arch 22, 1975 TVA reports l

that all three Brovns Ferry units are expected to be ready for fuel j i

loading in the latter pr.rt of this conth or cark June. i

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