ML20114B076
| ML20114B076 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/18/1992 |
| From: | Broughton T GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C311-92-2111, IEB-92-001, IEB-92-1, NUDOCS 9208240347 | |
| Download: ML20114B076 (7) | |
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Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057-019$
71? 944 7621 TELEX 84 2366 Writer's Direct Dial Number:
(717) 948-8005 Aug st 18, 1992 C314-92-2111 U. S. Nuclear Regulatory Commiss on Attn:-_ Document Control Desk Washington, D.C.
20555 Dir Sir:
Subject:
. Three Mile Island Nuclear Station, Unit I (THI-1)
Operating License No. DpR-50 Docket No. 50-289
-Supplemental Response to NRC Bulletin 92-01: Failure of Thermo-Lag 330 Fire Barrier System to Maintain Cabling in Wide Trays and Small Cond'nts Free from Fire Damage The purpose of this letter is to supplement the information provided by THI-1 inLresponse to the subject bulletin as submitted on July 27, 1992. During the continuing review of Thermo-Lag 330 installations at TMI-1, two additional small' diameter, preformed firc barr'er envelopes located in IPSH-FZ-1 and
.IPU-FZ-2 were identified as being within the scope of the bulletin. As a result of. that saro effort, the envelope designated as item C in IPSH-FZ-2 in the_ initial-response was determined to be out of scope.
The omission of two envelopes during the initial review of-screer, house
' Thermo-Lar; 330 barrier material installations resulted because of the manner in whic'. the protection was listed.
ISPH-F7.-1 was previously listed because of ottcr Thermo-Lag 330 barrier materialinstallations located in the space.
ISPH-FZ-1 contains one of each.of the newly identified preformed installations.
The first installation ir,volvedlsmall cables protected with preformed material at the entry to a. splice box (where the protected cables terminated with
.Rockbestos Firezone-R cable). The cables have beco added to the list of
-circuits / envelopes subject to the concern of IEB t 31.
In the second installation, armored cables were routed in two
'l cable trays that were assumed to be boxed-in their entirety with Thermo-Lag 330 board.
During-field inspection, it was found that the boxing was discontinued on the horizontal run and the remainder of the cable was enveloped by <4" preformed material.
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'd Document Control Desk C311-92-2111 Page 2 Similar configurations exist lfor cables serving the same function in area IPSH-FZ-2 of tne screen house'. As a result, the addition of area IPSH-FZ-2 to
-the listing of those areas containing Thermo-Lag 330 material subject to IEB 92-01~ concerns is appropriate.
Attachment I shows, in red, the physical locations af these barriers in the plant and lists the circuits / function being protected. The barrier locations and circuit / function 111etings_have been added to the fire pre-plans.
Sincerely, but-k/cm T. G. Brough n Vice President & Director, TMI-1 WGH Attachment cc: Administrator, Region I TMI Senior Resident Ir.spector s
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G311-92-2111 METH0POLITAN EDIS0N COMPANY JERSEY CENTRAL POWER AND LIGHT COMPANY PENNSYLVANIA ELECTRIC COMPANY GENERAL PUBLIC UTILITIES NdCLEAR CORPORATION Three Mile Island buclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Supplemental .esponse to 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 This letter is subnitted to provide a supplemental written response describing our actions taken associated with 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 " All statements contained in this response have been reviewed, and all such statements made and matter set forth therein are true and correct to the best of my knowledge.
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[jdtq T. C. Brought 6h Vice President and D! rector, THI-I Signed and sworn before-me this 18th day-of August
, 1992.
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ATTACHMENT 1 C311-92-2111
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1SHD-FB02 EE-SEGESSH-1T CONTROL / POWER (480V ENGD SFGDS SH SWTGR)
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-1SHD-FB05 EE-SEGESSH-1T POWER (480V ENGD SFGDS SH Sh'TGR)
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ATTACHMENT 1.
.C311-92-2111 Page 4 of 4 ISPH-FZ-2 j
BARRIER' FUNCTION PROTECTED D
ISHD-FB04 EE-SEGESSH-1R CONTROL / POWER (480V ENGD SFGDS SH SW1'GR )
F 1SHD-FB06 EE-SEGESSH-1R POWER (480V ENGD SFGDS SH SWTGR) a 1S3D-FB07 EE-SEGESSH-1R FOWER (480V ENGD SFLOS SH SWTGR) 4
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