ML17289A757

Responds to NRC Bulletin 92-001, Failure of Thermo-Lag 330 Fire Barrier Sys to Maintain Cabling in Wide Cable Trays & Small Conduits Free from Fire Damage. Subj Matl Not Utilized at Facility

ML17289A757
Person / Time
Site:	Columbia
Issue date:	07/28/1992
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GO2-92-179, IEB-92-001, IEB-92-1, NUDOCS 9208040192
Download: ML17289A757 (7)

Text

ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEM REGULAT INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION NBR:9208040192 DOC.DATE: 92/07/28 NOTARIZED: YES DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.HAME AUTHOR AFFILIATION SORENSEN,G.C. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to NRC Bulletin 92-001, "Failure of Thermo-Lag 330 Fire Barrier Sys to Maintain Cabling in WidCable Trays & R Small Conduits Free from Fire Damage." Subj matl not I utilized at facility.

DISTRIBUTION CODE: IE49D TITLE: NRC COPIES RECEIVED:LTR Bulletin 92-001, Failure g of Thermal-Log ENCL 330 P SIZE:

Fire Barrier Sys to M D

NOTES: /i RECIPIENT COPIES RECIPIENT COPIES A' ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDS LA PD5 PD DEAN,W.

D INTERNAL: N NRR/PD3-1 REG FILE 01 RES/EMEB R ....FILE EXTERNAL: NRC PDR NSIC R

D D

D NOTE TO ALL ",RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WAS'ONTACT THE DOCUMENT CONTROL DESK.

ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED)

TOTAL NUMBER OF COPIES REQUIRED: LTTR ll ENCL

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Bcvc968 ~ 3000George 1Pasbtngton Way ~ Rtcbland, Wasbtngton 99352<968 ~ (509)372-5000 July 28, 1992 G02-92-179 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

WNP-2, OPERATING LICENSE NPF-21 RESPONSE TO IE BULLETIN 92-01

Reference:

NRC Bulletin No. 92-01, "Failure .of Thermo-Lag 330 Fire Barrier System to Maintain Cabling in Wide Cable Trays and Small Conduits Free From Fire Damage", dated June 24, 1992 This letter responds to the three requested actions of the reference IE Bulletin.

Re uested Action For those plants that use either 1- or 3-hour pre-formed Thermo-Lag 330 panels and conduit shapes, identify the areas of the plant which have Thermo-Lag 330 fire barrier material installed and determine the plant areas which use this material for protecting either small diameter conduit or wide trays (widths greater than 14 inches) that provide safe shutdown capability.

~Res ense WNP-2 uses both 1 and 3-hour pre-formed Thermo-Lag 330 fire barrier material. The use of this material was identified by the Supply System in response to our review of IE Notices 91-47 and 91-79 and resulting concerns regarding the qualification of certain Thermo-Lag configurations.

This identification was not specific to small diameter conduit (less than 4-inches) or cable trays of greater that 14 inches, as most of the WNP-2 applications of this Thermo-Lag material satisfy this description.

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Page Two RESPONSE TO t

IE BULLETIN 92-01 Re uested Action

2. In those plant areas in which Thermo-Lag fire barriers are used to protect wide cable trays, small conduits, or both, the licensee should 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 inoperable fire barrier.

~Res onse Following review of IE Notices 91-47 and 79, one hour fire tours were established for areas using certain Thermo-Lag barrier configurations.

Review of IE Bulletin 92-01 resulted in the addition of some areas to the tour. The use of a one hour tour, preceeded by verification of the operability of fire detectors in the affected areas, is consistent with the fire protection requirement that was originally located in the WNP-2 Technical Specifications. The WNP-2 Fire Protection Technical Specifica-tion requirements have now been relocated to the FSAR (Appendix F, Section Fs5) as provided for by Generic Letter 88-12 and WNP-2 License Amendment 67.

Re uested Action Each licensee, within 30 days of receiving this bulletin, is required to provide a written notification stating whether it has or does not have Thermo-Lag 330 fire barrier systems installed in its facilities. Each licensee who has installed Thermo-Lag 330 fire barriers is required to inform the NRC, in writing, whether it has taken the above actions and is required to describe the measures being taken to ensure or restore fire barrier operability.

~Res onse WNP-2 does use Thermo-Lag 330 fire barrier material. The Requested Actions 1 and 2 have been taken by the Supply System for WNP-2.

Appropriate actions to restore barrier operability are being developed through an industry program being coordinated by NUHARC. This program will include establishment of a test database, development of guidance for applicability of tests, development of generic installation guidance, and consideration and coordination of additional testing as appropriate. We will apply the results of these efforts, when completed, to the Thermo-Lag installations that are within the scope of IE Bulletin 92-01.

Sincerely, G. C. orensen, Hanager Regulatory Programs (Hail Drop 280)

AGH/bk cc: JB Hartin - NRC RV DL Williams - BPA/399 NS Reynolds - Winston tt Strawn B Bradley - NUHARC RR Assa - NRC NRC Site Inspector - 901A

. STATE OF WASHINGTON)

Subject:

Res onse to IEB 92-01

)

COUNTY OF BENTON I. G. C. SORENSEN, being duly sworn, subscribe to and say that I am the Manager, Regulatory Programs for the WASHINGTON PUBLIC POWER SUPPLY SYSTEM, the applicant herein; that I have the full authority to execute this oath; that I have reviewed the foregoing; and that to the best of my knowledge, information, and belief the statements made in it are true.

DATE ~ ~ JCI 1992

. C. So ensen, Manager Regulatory Programs On this date personally appeared before me G. C. SORENSEN, to me known to be the individual who executed the foregoing instrument, and acknowledged that he signed the same as his free act and deed for the uses and purposes herein mentioned.

GIVEN under my hand and seal this ~day of 1992.

No y Public in and or the STATE OF WASHINGTON Residing at Kennewick Washin ton Hy Commission Expires A ril 28 1994

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ML14350A146 Unanalyzed Failed Modes Discovered for Containment Nitrogen System Caused by Inadequate Design Procedures. Dated November 14, 1991.

431-97-0141 Box 410