ML20067E275
| ML20067E275 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/29/1982 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8301040121 | |
| Download: ML20067E275 (13) | |
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THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P.O. BOX 97 m PERRY. OHIO 44081 5 TELEPHONE (216) 259 3737 m ADDRESS-10 CENTER RO.M Serving The Best Location in the Nation December 29,1982 Mr. B. 3. Youngblood, Chief Licensing Branch No.1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Fire Protection - Confirmatory Issue No. 36 and Miscellaneous FPER Concerns
Dear Mr. Youngblood:
This letter is provided in response to the letter dated November 26,1982, from A. Schwencer to D. R. Davidson regarding the confirmatory issue (#36) on the documentation or test of the 3-hour fire resistance of gypsum board walls.
As stated in our November 16,1982 letter, we are pursuing an Underwriter's Laboratory (UL) evaluation of the configuration differences between the Perry wall design and the design tested by UL. This evaluation is expected by January 14, 1983, and will be forwarded to the staff as soon as it is available.
Additionally, this letter and its attachments provides clarification on the staff concerns regarding the hydraulic calculations for standpipe sizing and drainage for the switchgear rooms. Attachment I to this letter provides the design criteria and sample calculations to demonstrate the adequacy of the standpipe size to meet the hose station requirements of NFPA Standard 14. The calculation shows that the worst case flow requirements are within the fire pumps capability. to this letter addresses the staff's concern about water accumulation in the switchgear rooms in the Control Complex Building. The justification that drainage is not needed was previously provided as the response to Question Topic 21 in our letter dated March 12, 1982.
Q O
go 8301040121 821229 PDR ADOCK 05000440 E
T Mr. B. J. Youngblood December 29, 1982 We believe that this information will enable the staff to resolve the hydraulic calculations for standpipes and drainage in the switchgear room in the next Supplement to the Safety Evaluation Report.
Sincerely, a
Dalwy Davidson Senior Vice President DRD:kh cc:
Jay Silberg, Esq.
John Stefano Max Gildner J. Stang l
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December 29, 1982 ATTACHMENT 1 PURPOSE:
To demonstrate that the standpipe and hose system is designed to supply an adequate watiar flow and pressure at each hose station outlet in accordance with the requirements of NFPA Standard 14.
DESIGN CRITERIA:
1.
The hydraulic calculation for the standpipe and hose system will be based on the worst case flow situation (greatest friction loss).
2.
All interior pipe is assumed to be Schedule 40, C=120, except when utilizing " Automatic" Sprinkler Corporation of America (ASCOA) hydraulic reference points.
These x
points are shown in the calculations and diagrams as
[
"A-X:
(X referring to point shown on ASCOA print no.
4549-70A-001-55-2, Equivalent Pipe Lengths).
For in-terior pipe lengths using "A-X" points, C=100, and for exterior "A-X" points, use C=75.
3.
All interior hose stations are designed for Class II service and sized for a minimum flow of 100 gallons per minute at 65 psi at the hose station outlet valve.
4.
The calculations will be based on a total flow of 500 gpm from both internal (building) and external (yard hydrant system) hose streams.
5.
When a hazard area is within reach of several internal hose streams, (utilizing 75' hose length except as noted) the calculations will include simultaneous water flow from multiple hose streams.
6.
Water flow from hose streams will be based on hose stations located on the same floor level and within the same building as the area being protected, except as noted (hose will be included from another floor only when the isolated location of the station in question prevents simultaneous flow with at least one other interior hose station, in accord with NRC requirements).
7.
The water flow from outside hose streams (yard hydrant sys tem), is the difference between the 500 gpm (required allowance from all hose streams) and the internal (building) hose stream protection.
Passage of hose through enclosed exit stairs or between adjacent buildings will not gen-erally be addressed since this would negate the existing g
stairs or fire walls by allowing smoke, heat and fire to enter the enclosure or adjacent building, and/or create a possible tripping hazard.
l Page 2 8.
The water supply for the standpipe and hose system will.
be based on rated capacity of the fire pumps.
The maximum water pressure available will be based on the fire pump relief valve setting.
Fire pump discharge outlets are located at El. 587'-10h".
9.
In areas of the plant where fixed fire suppression systems are located, the calculations will be based on a sim-ultaneous operation of both the fixed fire suppression system and all fire hose stations whose hose streams will reach the area protected by the fixed fire suppression system.
a.
The demand for the fixed water spray and automatic sprinkler systems will be based on " Automatic" Sprinkler Corporation of America (ASCOA) calculations, when available.
b.
When ASCOA calculations are not available, the demand for sprinkler systems will be based on the density curves of NFPA 13, Table 2-2.1 (B) for the largest fire area within the protected area of the system, but, with an area of sprinkler operation not to exceed 3,000 square feet.
These calculations will be shown on the " Conclusions" page for each case requiring them.
I If the pressure required for the interior hose stations c.
is less than that required by the ASCOA calculations i
for a fixed system (at the junction point), then further analysis of the standpipe / hose station is not required because the resultant flow and pressure will always be in excess of the hose requirements, (NFPA 14).
10.
Assumptions:
a.
Friction loss will be calculatet for all flows in pipe less than 4" in diameter.
b.
Friction loss will be calculated for flow greater than 200 GPM in 4" diameter pipe (unless otherwise noted).
c.
Friction loss will be calculated for flow greater than or equal to 500 GPM in pipe larger than 4" in diameter (unless otherwise noted).
11.
Conclusions for each hose station calculation are shown at l
the end of the individual sections (i.e.,
Intermediate Building or Control Complex).
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Page 3 ABBREVIATIONS / SYMBOLS:
X X-alphanumeric, hydraulic reference point A-X X-number (1,2,3,... ) hydraulic reference point from
" Automatic" Sprinkler Corporation of America Drawing No. 4549-70A-001-55-2.
Z Hydraulic Reference Point representing Fire Pump Discharge
" Automatic" Sprinkler Corporation of America - ASCOA
)
FSD - Fluid System Diagram FPER - Fire Protection Evaluation Report AUX. BLDG. - Auxiliary Building INT. BLDG. - Intermediate Building RAD. WASTE - Radioactive Waste Building l
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December 29, 1982 Drainage for Switchgear Rooms.
RESPONSE
An evaluation of the equipment located in the switchgear rooms has determined that a maximum water level of 4 inches could be tolerated in the switchgear rooms without endangering the switchgear operation. It is anticipated that hose streams located outside the rooms would be used on fire in these areas only as the second line of defense. If two hose streams were used simultaneously a water flow of approximately 200 GPM could be predicted. Drainage in or adjacent to switchgear areas is such that the predicted water flow would not create any appreciable accumulation on the floor of these areas. In addition, water accumula-tion from fighting a fire or from a pipe break in any of the switchgear areas can not accumulate to a level which could endanger the redundant equipment which is located in another area. 1}}