05000346/LER-1981-046-03, /03L-0:on 810807,five Open Places Between Metal Decking & Ceiling Were Found.Insp Revealed Insufficient Koolwool Present to Maintain Fire Wall Integrity.Caused by Const Error.Holes Filled W/Required Quantity of Koolwool

/03L-0:on 810807,five Open Places Between Metal Decking & Ceiling Were Found.Insp Revealed Insufficient Koolwool Present to Maintain Fire Wall Integrity.Caused by Const Error.Holes Filled W/Required Quantity of Koolwool

ML20010F960
Person / Time
Site:	Davis Besse
Issue date:	09/04/1981
From:	Wasll E TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010F944	List: 05000346/LER-1981-046, Forwards LER 81-046/03L-0 05000346/LER-1981-046-03, /03L-0:on 810807,five Open Places Between Metal Decking & Ceiling Were Found.Insp Revealed Insufficient Koolwool Present to Maintain Fire Wall Integrity.Caused by Const Error.Holes Filled W/Required Quantity of Koolwool
References
LER-81-046-03L, LER-81-46-3L, NUDOCS 8109150161
Download: ML20010F960 (3)

LER-1981-046, /03L-0:on 810807,five Open Places Between Metal Decking & Ceiling Were Found.Insp Revealed Insufficient Koolwool Present to Maintain Fire Wall Integrity.Caused by Const Error.Holes Filled W/Required Quantity of Koolwool

Event date:
Report date:
3461981046R03 - NRC Website

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EVENT CESCRIPTION AND PROB ASLE CONSEQUENCES h (10-33-81-52) On 8/7/81 at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, two architect engineers reported finding five l

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9 TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-52 DATE OF EVENT: August 7, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Penetrations in a safety-related fire wall were found to be unsealed Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MWT) = 0 and Load (Gross MWE) = 0.

Description of Occurrence: On August 7, 1981 at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, two architect engineers reported finding five open places between tne corrugated metal decking in the ceiling of Ele hallway to the diesel generators and the high voltage switchgear rooms, Rooms 322 and 324, respectively. The ceiling is a fire barrier. Upon inspection, some Kaowool was found in the heles. However, sufficient Knowool was not present to maintain fire wall integrity.

When reported, Maintenance Work Order 81-3107 was written to stuff the holes with additional Kaowool. This effort was completed on August 7, 1981 at 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />.

'fhus, the action statement of Technical Specification 3.7.10 was not implemented.

Technical Specification 3.7.10 states "all penetration fire barriers protecting safety related areas shall be functional" with an applicability of "at all times".

The action statement reads "with one or more of the above penetration fire barriers non-functional, establish a continuous fire watch on at least one side of the affected penetration within one hour".

As Maintenance Work Order 81-3107 was com-pleted in less than one hour from the tLae of the holes' discovery, this action statement was not implemented.

Designation of Apparent Cause of Occurrence: The cause of this occurrence was due The construction per-to personnel error during initial construction of Davis-Besse.

l sonnel involved should have ensured the holes were sufficiently sealed with fire barrier material at the completion of their work activities.

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Analysis of Occurrence: There was no danget to the health and safety of the public or to station personnel.

There was no fire which required the fire wall to have its l

integrity intact.

Corrective Action

When reported, Maintenance Work Order 81-3107 was written to fill the holes with additional Kaowool. This effort was completed on August 7, l

1981 at 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />. The action statement of Technical Specification 3.7.10 was of not implemented as the maintenance work order was completed within one hout discovery of the holes, i

LER #81-046 l

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TOLEDO EDISON COMPANY DAVIS-BFSSE NUCLEAE POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-52 PACE 2 ST 5016.11, Fire Protection System Barriers, is in the process of being modified to ensure complete c overage of the safety-related fire wall penetration seals by the surveillance test program. ?ersonnel responsible for the preparation of the modification are ensuring the safety-related ceilings / floors which act as fire barriers cre included in the surveillance test procedure.

Failure Data: Licensee Event Report NP-33-81-24 reported a similar occurrence on March 16, 1981 and Apr:J 3, 1981 when fire barrier holes were discovered.

Other violations of the integrity of a fire barrier were reported in Licensee Event Reports NP-33-80-11 (80-008), NP-33-79-063 (79-060), NP-33-79-061 (79-059),

and NP-33-78-137 (78-117).

LER #81-046 l

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