ML20043G256
| ML20043G256 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/12/1990 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20043G253 | List: |
| References | |
| NUDOCS 9006200099 | |
| Download: ML20043G256 (1) | |
Text
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.c PLA.NT SYSTEMS M
g L BASES 3/4.7.5 STAN08Y NUCLEAR SERVICE WATER POND
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- g The limitations on the standby nuclear service water pond (SNSWP) level L
- 3 d f and temperature ensure that sufficient cooling capacity is available to either:
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,(1) provide normal cooldown of the facility, or (2) mitigate the effects of accident conditions within acceptable limits.
C'C The limitations on minimum water level and maximum temperature are based 0 4 @J c exceeding its design basis temperature and is consistent with the on providing a 30-day cooling water supply to safety-related equipment without g]d o
u ations of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Plants,"
March 1974.
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h b]d+.
C The peak containment pressure analysis assumes that the Nuclear Service Water (RN) flow to the Containment Spray and Compo' ant Cooling heat exchangers l
i Q...o has a temperature of 86.5'F.
This temperature is important in that it, in Q f [g ' containment pressure occurs when energy additi G.
G-part, determines the capacity for energy removal from containment.
The peak 0
heat) is balanced by energy removal from these heat exchangers.
This balance
' f g t.
0,,recirculation and after ice melt.W is reached far out in time, after the transition from g g,3 in c ndensing the steam which passes through it, containment pressure is Because of the effectiveness of the ice bed g
o 0j insensitive to small varia% ons in containment spray temperature prior to ice o
,4 moltout.
d M]
302 To ensure that the RN temperature assumptions are met, Lake Wylie temperature is monitored.
During periods of time while Lake Wylie temperature
+
rd is greater than 86.5'F, the emergency procedure for transfer of ECCS flow
%do paths to cold leg recirculation directs the operator to align at least one w
train of containment spray to be cooled by a loop of Nuclear Service Water i
V
.- which is aligned to the SNSWP.
t o
3/4.7.6-CONTROL ROOM AREA VENTILATION SYSTEM f
The OPERABILITY of the Control Room Area Ventilation System ensures that:
. $+ c.,j,j (on)tinuous-duty rating for the equipment and i t.t o
1 the ambient air temperature does not exceed the allowable temperature for oo r-c o
system, and (2) the control room will remain habitable for operations personnel
$ 0
,.o o during and following all credible accident conditions.
Operation of the 0
p Mi p system with the heaters operating to maintain icw humidity using automatic M.s c c control for at least 10 continuous hours in a 31-day period is sufficient to 0
reduce the buildup of moisture on the adsorbers and HEPA filters.
The 3
I 3. wo[. OPERABILITY of this system in conjunction with control room design provisionsi is based on limiting the radiation exposure to personnel occupying the control
% g p % room to 5 rems or less whole body, or its equivalent.
CO This limitation is con-O ro sistent with the requirements of General Design Criterion 19 of Appendix A,
- g % $ 10 CFR Part 50.
ANSI N510-1980 will be used as a procedural guide for surveil-1 ddh1ancetesting.
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O 9006200099 900512
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