ML19270F236
| ML19270F236 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/31/1979 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19270F237 | List: |
| References | |
| NUDOCS 7902050172 | |
| Download: ML19270F236 (8) | |
Text
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK. ARKANSAS 722C3 (501) 371-4000 January 31, 1979 1-019-18 Director of Nuclear Reactor Regulation ATTN:
Mr.
P,. W. Reid, Chief Operating Reactor Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Fire Protec. tion (File:
1510, 20]D)
Gentlemen:
As requested by the Fire Protection Safety Evaluation Report for ANO-1, and committed to by our January 18, 1979 letter, the following informa-tion is provided for your review. The modifications described in this letter are referenced to Table 3.1 of the ANO-1 Fire Protection SER.
Items 3.3 and 3.7 Attached are drawings FK-332 and M-219 which show the Fire Water Supply to the Deluge Systems and other system details.
Also attached is a report describing the ANO-1 Cable Spreading Roo.n Deluge System Logic. The logic used by the Corridor Deluge Syste:. is identical to that used in the Cable Spreading Room.
Figure E-690 which shows the location of smoke detectors in the Cable Spreading Room is attached.
There are six (6) smoke detectors in the Corridor at El 372 used to actuate the Corridor Deluge System.
These are evenly spaced along the length of the Corridor as shown in attached Figure E-669.
Protecto-wire will be placed in all trays in both zones to ensure prompt actuation of the Deluge Systems.
As committed, we will protect redundant safe shutdown cables located in the Corridor. We have identified thirteen (13) red conduits which contain safe shutdown related cables that are redundant to many green conduits in the corridor. All of the red conduits identified will be wrapped with Kaowool their entire length in the corridor.
In addition one blue conduit (EC4021) was identified that is redundant to the green conduit (EC2184) running parallel to it.
EC4021 will be wrapped with g
Kaowool. The conduits to be wrapped are listed below:
p' EB1009 EB1029 EC1014 EC1130 EC1153 EC1154 I
EC1203 EC1204 EC1258 EC1260 EC4021 v( Y 7 9 0 2 0 5 0 /7A6
1-019-18 January 31, 1979 Mr. R. W. Reid, Chief Also attached is the specification (No. 6600-M-276) that describes the design and installation requirements for the Deluge Systems. At this time Figure 6600-M276-1-4 (sent to you in our January 18, 1979 letter) shows as accurately as possible the location of pipes and no::les in the Cable Spreading Room and Corridor Deluge Systems.
We will not have a more accurate description of this system until the as-built drawings are completed. This is due to the Cable Spreading Room being so con-gested that the placement of some pipes and no::les will not be finalized until the system is installed.
Items 3.4 and 3.8 Attached drawing E-669 is marked to show the location of redundant safe shutdown conduits and trays in the Switchgear Rooms.
All conduits and trays identified by our Fire Hazards Analysis as containing safe shut-down cables are color coded showing which channel they belong to.
Re-dundancies identified and the uetns of protection to be provided are as follows:
ZONE 99-M
- 1) EC2184 redundant to (RT) EC4021; EC2184 will be wrapped with Kaowool over its entire length in zone 99-M.
- 2) EC-1093 (RT) EA2005, EA2006, EA2021; EC1093 follows the North Wall the length of the zone. EA2005, EA2006, and EA2021 are located along the South Wall. There is no combustible bridge between them, ner do we consider a fire big enough to involve these redundant conduits due to transient combustibles a credible occurrence.
- 3) EC1190, EC1237 (RT) EC202, EC203, EC223; EC1190 and EC1237 run close to the ceiling perpendicular to EC203 and EC223.
Since the conduits would be very difficult to protect we will coat cables in trays EC202, EC203, and EC223 with Carboline.
- 4) EC1190, EC1237 (RT) EA2006, EA2007, EA2008, EC201, EC205, EC227, EC2300, EC2301; These redundant conduits are separated sufficiently to ensure that d
they w.11 not be involved in a single fire initiated by any credible means.
- 5) EB1040, EB1041 (RT) EB2029, EB2030; EB1040 and EB1041 will be wrapped with Kaowool for at least 10 feet starting at the point of least sepa-ration of the redundant conduits.
1-019-18 January 31, 1979 Mr. R. W. Reid, Chief ZONE 100-N 1)
EA2020 (RT) EA1016, EC112, EC113, EC1024, EC1275 2)
EA2021 (RT) EA101 3)
EC2219 (RT) EA1016, EA101, EC1023, EC1024, EC1036, EC1167, EC1273, EC112, EC113 4)
EC2300, EC2301 (RT) EC1022, EC112, EC113 EA2020, EA2021, EC2219,- EC2300, and EC2301 will be wrapped with Kaowool their entire exposed length in.one 100-N.
ZONE 149-E 1)
EB1096 (RT) EB215; Tray EB215 will be sprayed with Carboline as shown in attached Figure SK-4.
2)
EC2382 (RT) EC1300, EC1301, ECl343; These conduits will be protected as shown in Figure SK-3.
3)
EC1300 (RT) EC2376, EC2377, EC2;86, EC2450, EC2451, EC2452 4)
EC1301 (PT) EC2376, EC2377, EC2386, EB2194, EB2195 5)
EC1343 (RT) EC237, EC2386, EC2955 Conduits EC1300, EC1301, EC1343 are separated 1* more than 10 feet from any of the redundant conduits listed in items e,
4, and 5.
There is no combustible bridge linking the redundant conduits, nor do we consider a fire big enough to involve these redundant conduits due to transient combustibles a credible occurrence.
Very truly you s,
++
Daniel H. Williams Manager, Licensi.g
-DhE M0W:vb Attachm'ent
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