ML19294B188
| ML19294B188 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 02/20/1980 |
| From: | Randy Hall BROOKHAVEN NATIONAL LABORATORY |
| To: | Ferguson R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002270498 | |
| Download: ML19294B188 (4) | |
Text
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SRCCKHAVEN NAT!CNAL LABORATORY ASSOCIATED UNIVERSITIES, INC.
teen w.v vcu "v3 Deconment of Nuc'em Energy
- 51c' 3 :5 2144 February 20, 1980 Mr. Robert L. Ferguson Plant Systems Branch U.S. Nuclear Regulatory Commission Washington, D.C.
20555 RE: Dresden 1, Fire Protection Review, Items 3.1.1 and 3.1.5.
Dear Bob:
Attached are items 3.1.1, Fire Detection Systems, and 3.1.5, Water Suppression Systems for the Dresden 1 nuclear power plant.
Respectfully yours,
,y
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Robert E. Hall, Group Leader Reactor Engineering Analysis REH:EAM:sd attachment cc.:
R. Cerbone wo/att.
W. Kato E. MacDougall V. Panciera wo/att.
E. Sylvester
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Yfg 8002270
DRESDEN 1 Fire Protection Review Item 3.1.1 - Fire Detection Systems On December 4,1979, the licensee submitted to the NRC, the design details for fire detection systems in the Control Room and Containment Penetration area.
These two items are covered under 3.1.1, Fire Detection Systems, in the issued SER.
The drawings for the detection system in the Control Room shows detectors mounted on the concrete ceiling. During a conversation with the licensee, it was deter-mined that the new ceiling to be installed will be an aluminum grid. This will allow the products of combustion access to the detectors above the ceiling.
The drawing did not show any fire detectors in the low consoles which is re-quired by the SER. The fire detectors should be installed in these consoles.
The detectors for actuation of the deluge system for protection of the elec-trical penetration inside containment consist of six (6) ionization detectors with canopies -4 tending over the top of the detectors to collect the products of combustion.
Based upon the above review and contingent upon installation of detectors in the consoles we find 3.1.1, Fire Detection, satisfactory and recommend thTt the staff accept this item.
However, current research is now going on in the field of detector location and, at the staff's request, a new detector locating criteria will be established in the reasonable near future. Therefore, we recommend that the staff reevaluate the adequacy of the plant fire detection system at the appropriate time.
Item 3.1.5 - Water Suppression System The licensee under a cover letter dated December 4,1979 forwarded to the NRC design drawir.gs for the asterisked items under 3.1.5, Water Suppression Systems, in the issued SER.
The following are recommendations and comments on the various water suppression systems to be installed at the Dresden 1 facility.
1.
Autanatic Preaction Deluge System - cable penetration area.
a.
The design water flow should be 0.15 gallons per minute per square foot density on all cable tray surface areas.
b.
Drawing #26-1734 Sheet 1 is not clear, piping cannot be traced, and the head location cannot be determined, c.
The feed for the preaction system for this area is fed from the pre-action system protecting the tunnels. This arrangement is unacceptable.
The feed to the preaction system for the cable spreading area should be an independent feed.
d.
Two motor operated valves on the feed to the preaction system close on a signal for containment isolation.
Evaluation should be conducted to determine if a fire in the penetration area could cause this signal.
This would disrupt the feed to the spray heads at the time when the water is needed most.
e.
Heat collectors should be provided on the fusible linked spray heads.
f.
Low air supervision should be provided on the closed head spray piping with annunciation in the control rooms.
We recommend that the staff accept this item subject to review and approval of sub-item a thru f.
2.
Automatic Sprinkler Protection - north auxiliary bay - drawings not received.
We recommend that this part of item 3.1.5 be kept open until the drawings are received and reviewed.
3.
Automatic Deluge System - hydrogen seal oil unit.
a.
The density for the protection of the tank should be 0.25 gallons per minute per square foot over the entire surface area of the tank.
(NFPA 15 paragraph 4-4.3.2b).
b.
A remote actuation station for the deluge system should be located out-side the entrance to the room.
We recomend that this part of item 3.1.5 be accepted subject to the above noted requirements.
4.
Automatic Preaction Deluge Systems - cable tunnel, a.
The spray heads should be located at the center line of the trays being protected.
b.
Low air supervision should be provided on the closed head spray piping with annunciation in the control room.
We recommend that this part of item 3.1.5 be accepted subject to the above noted requirements.
5.
Automatic Sprinklars - unit I trackway.
Drawing reviewed and design found satisfactory.
6.
Automatic Sprinklers - screen house - diesel fire pump. Drawing reviewed and design found satisfactory.
7.
Automatic Sprinklers - core spray - post incident pump area.
Drawing re-viewed and design found satisfactory.
8.
Automatic Sprinklers - new fuel receiving area.
Drawing reviewed and de-sign found satisfactory.
We recomend that the staff accept parts 5 thru 8 of item 3.1.5.
9.
Extra Hazard Automatic Sprinklers - clean and dirty oil room.
Drawing re-viewed and found acceptable except density requirements should be 0.28 gal-icn per minute per square foot over the entire room. This will then meet the density requirements of NFPA 13 paragraph A2-2.1.2.6.
We reconinend that the staff accept this item.