ML20106D690
| ML20106D690 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 09/30/1992 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, NUDOCS 9210130234 | |
| Download: ML20106D690 (4) | |
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iluntmn!:r,,Y'lwiA hm-Goosisan nt gi'>'f DUKEPOWER 7w, September 30, 1992 U.
S. 11uclear Itogulatory Commission Attention: Document Control Desk Washington, D.
C.
20555
Subject:
McGuito !!uclear Station, Unit.; I and 2 Dockot tios. 50-369 and 50-370 1111C Bulletin No. 92-01, Supplemont 1 Failure of Thermo-Lag 330 Fire Barrier System to Porform its Specified Fire Enduranco Function Daar Sir; to flRC Bulletin 92- 01 was roccived August 31, SuppJenent 1 1992.
At.tached, pleacu find the respo'a:e ior McGuire liuclear StLtion.
There in limited use si the Thermo-Lag 330 fire barrior syntem protecting safe shutdown equipment at The attached response discussos the actions that McGuire.
we have taken as a result of the supplement to the bulletin.
Please cont.act Paul Guill at (704) 875-4002, if you hav any questions regarding this issue.
I declare under penalties of perjury that the statements set forth herein are true and correct to the best of my knowledge, Vory truly your<3, v/
Ted C.
McMeekin b b b i,I,* j r
9210130234 920930
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' U: S. Nuclear Regulatory Commis= ion
-t, September 30, 1992 page 2 l
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Ebnoter Regional Administrator, Region II t
P. K. Van Doorn
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Senior Resident Inspector, McGuire
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O ATTACHMENT DUKE POWER COMPANY MCGUIRE NUCLEAR STATION RESPONSE TO NRC BULLETIN 92-01, SUPPLEMENT 1 NRC REQUESTED ACTION 1.
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 the protection and separation of the safe shutdown capability.
DUKE'S RESPONSE TO REQUESTED ACTION 1.
Thermo-Lag 330 panels are utilized in three areas at McGuire Nuclear Station.
They are as follows:
- 1) Auxiliary Building Unit 1 Pipe Chase (elevation 716+0);
2, Unit 1 Train "B" Switchgear Room (elevation 733+0); and
- 3) Unit 2 Motor Driven Auxiliary Feedwater Pump Room (elevation 716+0).
The following is a brief dircussion of the equipment that is being protected within each of the above identified areas:
(1) Auxiliary Building Unit 1 Pipe Chase Motor operated valves (MOV)
ICA161C and ICA162C and their corresponding supply cables located in this area.
These DC MOVs are associated with the Standby Shutdown System (SSS) and are powered by the SSS batteries.
(2) Unit 2 Motor Driven Auxiliary Feedwater Pump Room This area houses the Unit 2 valves (2CA161C and 2CA162C) which equate to the above Unit 1 comp 3nents.
The MOVs are the only The components in this area that are protected by Thermo-Lag 330.
supply cables for the MOVs are protected by another fire resistant material l
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i (3) Unit 1_ Train "B"
Switchgear Room Train "A" cables (IILE-679,-680, and -702) are routed through this
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The cables are enclosed by Thermo-Lag 330 panels.
These cables supply instrument indication to the SSS.
NRC REQUESTED ACTION 2.
In those plant areas in which Therno-Lag fire barriers are used in raceways, walls, ceilings, equi'pment enclosures, or other areas to protect cable trays, conduits, or r.eparate redundant safe shutdown functions, the licensee should i'.nplement, in accordance with plant-such as fire procedures, the - appropriata compensatory measures, watches _, consistent with t use which would be implemented by either the plant Technical Specifications or the operating license for an inoperable fire barrier. These compensatory measures should remain in place until *he licentee can declare the fire barriers operable on the basis of applicable tests which demonstrate successful 1-or 3-hour barrier performance DUKE'S RESPONSE TO Nnc REQUESTED ACTION 2.
Dased on a review of Supplement I to Bulletin 92-01, the fire barriers which utill e Thermo-Lag 330 were declared inoperable. As specified by plant administrative procedures, hourly fire patrols were established for the fire barriers in question within the Unit 2 Motor Driven Auxiliary Feedwater. Room and the Unit 1 B train Switchgear Room.
A continuous fire watch was initially posted at the Unit 1 Mechanical Pipe chase.
Upon -rerifying that the Unit 1 chase area was equipped with appropriate fire detection pipe l
capabilities, the continuous fire watch for the Unit 1 pipe chase area was changed to an hourly fire patrol.
The total application of Thermo-Lag 330 as a fire barrier material protecting safe shutdown equipment at McGuire Nuclear Station is l
1ess than 500 square feet.
Currently, investigations are underway-to either identify a suitable substitute material for the Thermo-Lag 330 material or determine what enhancements, if any, that are needed to the installed configuration to ensure that these fire barriers meet appropriate regulatory requirements and acceptance criteria. Until then, hourly fire patrols for the above identified three areas will continue to be performed.
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