ML20118A645
| ML20118A645 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/15/1992 |
| From: | Skolds J SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, NUDOCS 9209240279 | |
| Download: ML20118A645 (5) | |
Text
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South Carotms Etsctric & Gas 00mpany
. John L Skolds P.O. Box 88 Vice President Jenkinsvme. SC 7906$
Nuclear Opmat ons s
1803) 345-4040 SCE&G s.n -
September 15, 1992 I
Document Control Desk V. S. Nuclear Regulatory Commission Washington, DC 20555 Gentlemen:
Subject:
VIRGIL C. SUMMER NUCLEAR STATION DOCKEI NO. 50/395 OPERATING LICENSE NO. NPF-12 RESPONSE TO NRC BULLETIN 92-01, SUPPLEMENT 1 South Corolina Electr P & Gas Company submits the attached pursuant to NRC Bulletin 92-01, Supple ;nt 1.
I declare that the statements a.id matters set forth herein are true and correct to the best of my knowledge, information, and belief.
Should you have any questions, please call at your convenience.
Very truly.. 'rs,q k
ft% v b
John L. Skoldt RJB:lcd c:
- 0. W. Dixon P. R. Mahan R. J. White General Managers G. F. Wunder NRC Resident Inspector J. B. Knotts Jr.
File (815.02)
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%209240279 920915
""" LEAR FXCELLENCE - A SUMMER TRADITION!
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Attachment to Document Control. Desk Letter' l
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-1,ES 920001.
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Page_1 of 4 SOUTli CAROLINA FLECTRIC & GAS COMPANY FIRE BAPRIER REPORT PER NRC BULLETIN 92-01, SUPPLEMENT 1 AND TECHNICAL SPECIFICATION 6.9.2 Thermo-Lag 330 barrier material is used in five locations at Virgil C. Summer Nuclear station.
Each installation is designed to provide 1-hour fire-barriers to meet ti seperation requirements of-10 CFR 50, Appendix-R.
Theruo-Lag Panels are used to protect Cable _ Tray 3088. This cable tray is 18 inches wide and supplies various A-Train loads. Table B (attached) identifies the affected loads.
j Thermo-Lag preshaped conduit sections are used to protect a 3 inch conduit which supplies DC power to the Main Control Board.
Thermo-Lag Panels and a steel frcme is used to enclose two conduits which contained Nuclear Instrument signal cables. This installation is identified by Thermal Science, Inc., as a Self Supported Structure.
Due to its size and similarities in construction, this barrier may be suscentible to the same type of failures as the large-cable trays.
'hermo-Lag Panels and Flexi-Blanket are used to protect Unistrut and threaded rods which suspend a M-Board fire barrier over the "A" Service Water Booster Pump. This is an upgrade to a pre-existing fire barrier previously reviewed by the NRC.
Thermo-Lag preshaped conduit sectior.s are used to protect 2 conduits which provide "A" Train power to the "C" chiller. This barrier'is insta' led to maintain swing component capability.
Initially, compensatory actions were established for this fire barrier. However, based on the definitiva "small diameter conduits" received from the NRC and NUMARC meeting of July 7, 1992, compensatory actions were suspended fcr this area. Compens/ttory actions were re-initiated upon receipt of Supplement 1 on August 31, 1992.
The location, type and purpose of all Thermo-Lag installations are identified on Table A (attached)..Upon receipt of NRC Bulletin 92-01, a Non Conformance Notice (NCN) and Removal Restoration Sheet (R&R) were initiated to identify the condition of the Thermo-Lag fire barriers. A roving fire watch was established on June 25, 1992, to tour each room containing a Thermo-Lag fire barrier.
Station procedures require an inspection of each room on an hourly basis. provided the fire detection capability exists, in the event of a loss of fire detection capability, a continuous fire watch will be established in each area.
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Attachment to Document Control' Desk Letter.
C 1E0,920001-Page-2 of 4
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South Carolina Electric & Gas Company has established compensatory actions as i
-.requ red by NRC Bulletin 92-01 Supplement-1.--We will continue-to-work with Thermal > Science, Inc., and the industry to develop a course of action to ensure the fire barriers are capable _of performing their. design function.
This course of action may include one Or more of the following:
1.
Review available test documentation to reaffirm drceptability of j
existing fire barriers.. Thi, may require performance of site; spet;.ic fire endurance tests.
2.
Receive and review adequate. test documentation to upgrade the present installations.
3.-
Replacement of Thermo-Lag fire barriers with a tested, approved
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ftre. barrier system.
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Attachment to Document CSntrol Desk letter i-IEl)970001=
-Page 3 of 4
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TABLE-A THERMO-LAG FIRE BARRIERS
- i FIRE NRC BARRIER BULLETIN IDr TYPE
' SIZE LOCATION APPLICABILITY
-FUNCTION.
24A-TW SSS*
8 X 17 CB 36-03 2
Separation of NI-31 and N1-32 signal cables from NI-33 power cable.
-j 58-TW Cabie 18" IS12-02S 1, 2
' Protection ui Jale Tray
.l Tray IB 36-02 3088, (see table B for
-components supplied).
94W Conduit 4"
IB 26-01 2
Protection of "C" Chiller, A-Train power supply.
74-TW Conduit 3"
CB 12-04
- 1. 2 Protection of DC power to Main Contrci Board.
4 76-TW Panels N/A IB 12-02S 2
Protection-of supports for M-Board fire barrier Flexi-over 'A" Service Water-Blanket Booster Pump.
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SSSa:
Self Supported Structure made from prefabricated panels.
CB:
Control Building IB:
Intermediate B'illding 1:
NRC Bulletin 92-01, Supplement 1 2
4 E.
Attachmerit to Document Control Desk letter IEB 920001 Page A of 4 TABLE B Components Supplied Through Cable Tray 3088:
Equipment Safety _
Number Name Class XfN0038A Battery & Charging Room Air Handling Unit "A" (HNS)
Supply fan Xfh0039A Battery Room Exhaust fan "A" (NNS)
XES2001A Speed Switch, Component Cooling Pump "A" (SR)
XES2001C Speed Switch, Component Cooling Pump "C" (SR)
XPH 70 '0A Control Room Evacuation Panel (SR)
XSW0001 Reactor Trip Switchgear (SR)
XCA0001A S-S. Power Cabinet lA (NNd)
XCX5201 Diesel Generator "A" Control Cubicle (SR)
XPNS504 Diesel Generator "B" Relay & Terminal Panel (SR)
XES0006 Diesel Generatar "A" Starter DC ruel Oil Pump (SR)
XEX4201 Diesel Gener6 tor "A" Exciter Regulator Cubicle (SR)
XPN5248 Relay & Isoittian fuse (SR)
XBCIA DC Distribution Bus lA Battery Charger (SR)
XBCIA-1B DC Dist <bution Bus lA-1B Backup Battery Charger (SR)
XPNS259 Isolation fuse Panel (SR)
XSW10A 7.2 KV Switchgear, Bus IDA (SR)
XSW10Al ESF 480 Volt Unit Substation. Bus 10Al (SR)
XSW10A2 ESF 480 Volt Unit Substation, Lus 10A2 (SR)
XPN60ll Reactor Protection Under frequency & Under Voltage (Sr.)
Pariel 1 XPN7106 Main Control Board Termination Cabinct (SR)
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