ML19326C506
| ML19326C506 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/17/1978 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| 1-048-10, 1-48-10, NUDOCS 8004230625 | |
| Download: ML19326C506 (4) | |
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' REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDE' 50-31? 368 DISTRIBUTION FOR INCOMING MATERIAL REC: REID R W ORG: WILLIAMS D H OCDATE: 04/17/78 NRC AR PWR & LIGHT DATE RCVD: 04/25/78 COPIES RECEIVED DOCTYPE: LETTER NOTARIZED: NO LTR 4 ENCL 4
SUBJECT:
FORWARDING RESPONSE'TO ALL NRC QUESTIONS TO DATE RE FIRE PROTECTION OUESTIONS 3C AND 39.
W/ATT BLUE LINE DRAWINGS OMITTED FROM APPLICANT"S 04/12/78 SUBMITTAL... NOTE: DIST PER R.
INGRAM 07/11/78... DRAUTMne anU"D TO BRANCH.
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g REVIEWER INITIAL:
XJM PLANT NAME: ARKANSAS - UNIT 1 ARKANSAS 1 - UNIT 2 DISTRIBUTER INITIAL:
DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************
0000.************
FIRE PROTECTION INFORMATION (AFTER ISSUANCE OF OL).
(DISTRIBUTION CODE A006)
WlEdCL STO L7L FOR ACTION:
BR r uver nRB#4 BC**W/4 ENCL 4$$
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INTERNAL:
REG FILE **'/
NRC PDR**W/ ENCL
/2 ENCL DELD**LTR ONLY AUXILIARY SYS BR**W/2 ENCL AD FOR SYS & PROJ**W/ ENCL PLANT SYSTEMS BR**W/5 ENCL WAMBACH**W/ ENCL R.
MURANKA**W/ ENCL HANAUER**W/ ENCL EXTERNAL:
LPDR'S RUSSELLVILLE, AR**W/ ENCL TERA **W/ ENCL NSIC**W/ ENCL ACRS CAT B**W/16 ENCL IHIS DOCUMENT CONTAINS t.
P00R QUAUTY PAGES r
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DI IBUTION:
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ENCL 60 CONTROL NBR:
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Director of Nuclear Reactor Regulation ATTN:
Mr. R. W. Reid, Chief Operating Reactor Branch #4 Mr. J. F. Stolz, Chief Light Water Reactors Branch #1 U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Subj ect: Arkansas Nuclear One - Units 1 and 2 Docket No.'s 50-313 and 50-368 License No. DPR-51 Response to Fire Protection Questions (File:
15107 2040, 2-1510, 2-2040)
Gentlemen:
This com-Attached are responses to Fire Protection Questions 3C and 39.
pletes our response to all NRC questions formally received to date.
Also enclosed are blue line drawings that were
'itted from our April 12, 1978 submittal.
Very truly yours,
&?er Daniel H. Williams Manager, Licensing DHW:JTE:ce Attachment TC 192#
.Yk M E M E3 En MtOOLE SOUTH UTILITIE S S YST E M T A X P AYING. INVESTOn OWNED
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I ITEM 3C.
Identify any safety related systems which are disabled by a direct inter-lock upon initiation of a fire protection system.
Also identify any safety related systems which may be disabled as a resuit of the application of extinguishing agent.
RESPONSE
(ANO-l and'ANO-2)
There are no safety related systems which are disabled by a direct inter-lock upon initiation of a fire protection system.
Of the extinguishing agents we use, water is the only one with a signifi-cant potential to damage equipment.
This potential is directed at MCC, LC and other electrical cabinets which might be shorted due to the appli-cation of water.
In the event of a fire in an electrical cabinet, portable extinguishers (most generally CO ) will be used.
Sine-the cabinet is assumed lost due 2
to the fire, the extinguisher could cause no additional damage.
The extin-guishing agent from a portable extinguisher would be confined to the cabinet in which the fire existed.
In the unlikely event a fire in an electrical cabinet could not be extin-guished by hand extinguishers, water (fire hose) would be used.
The use of water, however, is always a last resort in fighting electrical fires.
Even if a fire hase were used, the Fire Hazards 1,alysis has shown that no situation exists where redundant safe shutdown equipment could be affected.
There is only one situation where the actuation of an automatic (water) system or breakin a fire water pipe could possibly af fect safety related equipment. This is the ANO-2 vital AC panels 2RS1, 2RS2, 2RS3 and 2RS4.
Drip shields, which will protect these panels from water spray, have been ordered and will be installed upon arrival.
The only other area of concern from water spray is the diesel generator rooms. Water in only used in these areas as a last resort, However, if water spray were to damage a diesel, the Fire Hazards Analysis has shown that only one channel would be affected.
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. ITDi 39 Provide an analysis which shows that failure or rupture of a non-seismically qualified fire protection system will not subsequently cause damage or failure of safety related equipment required for safe-shutdown.
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RESPONSE
(ANO-1 and ANO-2)
This item is answered by response to Item 3C.
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