ML20070H147

Part 21 Rept Re Problems W/Thermolag Fire Barriers.Initially Reported on 940715.Replaced Thermolag Fire Barriers

ML20070H147
Person / Time
Site:	Fermi
Issue date:	07/15/1994
From:	Shukla G DETROIT EDISON CO.
To:	Joseph Sebrosky NRC
References
NUDOCS 9407210126
Download: ML20070H147 (5)

Text

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POWER REACTDR EVENT NUMBER:

27537 FACILITY: FERMI REGION:

3 NOTIFICATION DATE: 07/15/94 UNIT:

[2] [ ] [ ]

STATE: MI NOTIFICATION TIME: 08:51 [ET)

RX TYPE: {2] GE-4 EVENT DATE:

07/15/94 EVENT TIME:

- 08 : 51 [EDT]

NRC NOTIFIED BY: LYNN GOODMAN LAST UPDATE DATE:

07/15/94 HQ OPS OFFICER:

JOSEPH SEBROSKY NOTIFICATIONS EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION:

CCCC 21.21 UNSPECIFIED PARAGRAPH UNIT SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE O

REFUELING j

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REFUELING EVENT TEXT THE LICENSEE IS ISSUING A 10CFR 21 REPORT DUE TO A PROBLEM WITH THERMOLAG FIRE BARRIERS AT THE SITE.

THE PROBLEMS WITH THE FIRE BARRIERS WERE DISCOVERED DURING REMOVAL AND REPLACEMENT OF THESE BARRIERS IN THE ON GOING FOURTH REFUELING OUTAGE.

DETAILS OF THE DISCREPANCIES ARE PROVIDED IN THE REPORT, HOWEVER, THEY ARE GENERALLY RELATED TO THE FOLLOWING:

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- PANELS WERE NOT INSTALLED CORRECTLY

- CABLE TRAY WRAPS DID NOT HAVE ENOUGH PROTECh'IVE MATERIAL INSTALLED

- INTERFERENCES / HEAT TRANSFER SURFACES SUCH AS PIPES, CONDUITS, CABLE TRAY AND PIPE SUPPORTS WERE NOT ADEQUATELY ^ PROTECTED WITH SUFFICIENT AMOUNT OF THERMOLAG MATERIAL.

IT IS NOT KNOWN TO DETROIT EDISON WHETHER THE CONTRACTOR WHO PERFORMED THE l

INSTALLATION AT THE SITE INSTALLED THERMOLAG AT ANY OTHER NUCLEAR POWER l

PLANT.

l 9407210126 940715 PDR ADDCK 05000341 A

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JUL-15-1994 09:21 FERtil 2 DET EDISON 313 586 4208 P.01

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PRC No. 94 41 (Rev.1) i 4

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10 CFR 21 REPORTABILITY EVALUATION a

Evaluation Result and Recommendation:

i 14 This potential reportable condition represents problems and discrepancies identified-1 regarding installation of Thermo-lag fire barriers at Fermi 2 which were discovered during j

removal and replacement of these barriers in the on-going fourth refueling outage. Details of the discrepancies are provided in the attachment, however, they are generally related to the following conditions.

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Interferences / heat transfer surfaces such as pipes, conduits, cable j

tray and pipe supports were not adequately protected with -

i sufficient amount of Thermo-Lag material.

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0 Panels were not installed correctly.

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0 Cable tray wraps did not have enough protective material installed.

d These identified improper installation conditions concern an activity or a basic comnonent which is necessary to ensure the capability to shutdown the' reactor and maintain it in a safe shutdown condition because these installations may not be capable of providing the j

required protection from fire to structures, systems, and components important to safety.

1 These installations appear to contain deviations and defem. as defined in 10 CFR 21, because they resulted in a product that does not meet the requirements of the Detroit Edison procurement documents for providing qualified fire protection barriers at Fermi 2.

The defect ofimproper installation of Thermo-Lag fire barriers is such that it may not

_ provide required fire protection to essential safety systems. This could result in a major 5

degradation of these systems such that a required safety function may not be performed during or after a fire. Therefore, this defect could create a substantial safety b-d. as defined in 10 CFR 21.

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Therefore, the condition ofimproper installation of discussed Thenno-Lag fire barri:rs at Fermi 2 is recommended as Leportable under the requiremtnts of 10 CFR 2L Written by: G. S. Shukla f

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.J.UL-15-1994 09:22 FERMI 2 DET EDISON 313 586 4208 P.02 (Attachment to PRC No. 94-01, Rev.1)

IMPROPER INSTALLATION OF THERMO-LAG FIRE BARRIERS During removal and replacement of the Thermo-Lag fire barriers at Fermi 2 the following installation discrepancies were observed by the Fermi 2 Fire Protection Engineer

1) Generic Problems:

Interferences / heat transfer surfaces such as insulated pipe, conduits, cable tray, and pipe supports were not encased or coated with sufficient amount of trowel grade Thermo-Lag material.

Panels were not always installed uniformly (e. g. with the ribs' facing out), as required.

2) ' Relray Room Stairwell (El. 613'-6"):

Where the cable tray wrap system terminated at the two existing silicone foam seals, the Thermo-Lag material stopped at the outer edge of the foam providing no' protection for the cables imbedded in the foam seal, below the Thermo-Lag seal, once an inch of foam was burned away (foam burns away-at 3 inches per hour).

3) Cable Tray Vault (El. 677'-6"):

The expanded metal which is required to' achieve the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire rating for a wall type assembly was completely omitted.

Panels were used to support each other in lieu of support steel. In one instance a panel cantilevered out four feet to a second panel cantilevered down about three feet forming a right angle.

4) CCHVAC Area (El. 67T 8"):

Panels were simply sitting on the floor without actually being fastened to the floor, as required.

Outside the control room ventilation duct work, adjacent to fire dampers in the duct work, support steel was installed around the dampers without the vendor specified clearance. The effect of this installation on the dampers is being evaluated at this time. These dampers serve ~ solely a fire barrier -

function and the observed condition has no effect on the operability of the-control room ventilation system.

I,lJL-15-1994 09:23 FERf112 DET EDISON ~

313 586 4208 P.03 l

(2) i-Detroit Edison is further investigating this issue with the contractor performing removal and replacement of Thermo-Lag material to obtaln written confirmation of potential additional discrepancies.

Thermal Science, Inc. (TSI) furnished and delivered the Thermo-Lag trowel grade and pre-fabricated panel material. TSI also furnished technical assistance

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to develop a procedure to support the installation requirements as defined in Detroit Edison's specifications with Detroit Edison's site contractor responsible for the installation of the material. TSI provided field service engineer for on-site technical assistance and provided site visits to investigate interferences and to recommend installation process. TSI also trained and certified the crew of the

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i site contractor responsible for installation and inspection of the material at Fermi

2. The installation was required to be performed by personnel certified by TSI.

Installation of the Thermo-Lag material at Fermi 2 and first line supervision of the installation was performed by the P. R. Sussman Company of Toledo, Ohio per. the contract. The P. R.. Sussman Company also furnished verification records showing acceptance of the Thermo-Lag installation at Fermi 2.

In -

addition, TSI issued a letter to P. R. Sussman Company stating that. the installation of the Thermo-Lag material at Fermi 2 was completed according to TSI's published application guide and generic test report.

It is not known to Detroit Edison whether the P. R.~ Sussman Company performed installation of Thermo-Lag material at any other nuclear power plant.

h Written by: R. J. Kiroy 2 ?- %B --