TXX-6936, Forwards Info Associated W/Wcap 11331 Re Plant Thermal/ Hydraulic Analysis of Fire Safe Shutdown Scenario,Per NRC 871104 Request.Record of 871104 Telcon W/Westinghouse Encl
| ML20236M512 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/05/1987 |
| From: | Counsil W, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TXX-6936, NUDOCS 8711130157 | |
| Download: ML20236M512 (6) | |
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i nlELECTRIC A
l wmi s c. c=nsit November 5,.1987'
' Encuive Vice President ~
N U. S~ Nuclear Regulatory Commission
. Attn:
Document Control Desk--
Washington, DC 20555 i
SUBJECT:
COMANCHE PEAK STEAM' ELECTRIC STATION'(CPSES)
DOCKET NOS. 50-445 and 50-446' l
-TRANSMITTAL OF INFORMATION ASSOCIATED WITH WCAP 11331, COMANCHE 1
PEAK STEAM. ELECTRIC STATION' THERMAL / HYDRAULIC ANALYSIS.0F FIRE SAFE SHUTDOWN-SCENARIO-Gentlemen:
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~
i Attached are copies of a comparison. of time frames used for' WCAP 11331 and
. EPM.-P0257-167-000 - and a. telephone. conversation record containing data used to, calculate PRTc rupture time ~ with ~ spurious Safety Injection in the WCAP.
Please' note the WCAP calculation of PRT rupture time' represents a conservative l
- estimate and-is'not. intended to be a~best estimate.
~
i Thi's information ~is provided in response to our. telephone conversation of November,4, 1987, with your staff.
Very truly yours.
W. G. cA W. G. Counsil By:
D. R. Woodlan j
Supec.Isor Docket Licensing R08/vjt Attachment
~ c1-Mr. A. Fresco, BNL Mr. R.'D. Martin,' Region IV 1
J Mr. A. Singh, OSP.
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- Resident Inspectors, CPSES (3) 0y
' 8711130157 871105 i
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i TXX-6936
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. Sheet 2 of 3 COMPARISON OF CALCU'.ATION NO. EPM-P0257-167-000 TIMEFRAMES' TO WESTINGHOUSE SPURIOUS SI ANALYSIS (WCAP 11331, p. 67 and 106)
I l
Time (sec)
Westinghouse Cale No. EPM-P0257-167-000 0
Offsite power available (Same)
Trip Reactor (manual)
Trip-Main FW Pumps 120-1270 RCS Pressure at Safety (Same)
Valve Setpoint 180 Close MSIVs Trip RCPs (Same) 300 Stop One Charging /SI Pump 720 Initiate AFW Flow at (Same) 235 gpm/SG to Genera-tors 1 and 2 780 Terminate Safety Injection Flow 840 Stop One Charging /SI Pump 1020 Terminate PRZ Heater (Same)
Operation.
1050 Pressurizer Level at 100%
1140 Terminate Safety Injec-tion Flow 2290 Approximate Time of In-(Same) active Loop SG Dryout (SGs 3 and 4) 2290-3870 RCS Pressure at Safety RCS Pressure at Safety Valve Setpoint (Liquid Valve Setpoint Break Flow Discharge) 2800 Throttle AFW (Same) 3120 PRT Rupture (WCAP 11331 p.
67)
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.TXX-6936:
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Time-(sec):
-Westinghouse:
iCalc.!No.' EPM-P0257al67-000.
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~3500' Pressurizer ' Level 'at: 88%
PRT..Does ~ Not ' Rupture'
.y 3600
_ Transient'.Terminati.on (Same)'
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TXX-6936 Attachm*Ht 2' ELEPHONE CONVERSATION. RECORD
. Sheet 1 of 2.-
Date: 11/04287 Time: 4:10pm' CST l
. Call;by:
A. F. cannon of Westinghouse
'4 (Name) 1 (Company)-
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Answer.by H.
R.
Beck of CPE, Fire Protection (Name)
-(Company)
' Subject discussed COMANCHE PEAK STEAM ELECTRIC STATION WESTINGHOUSE CALCULATION OF PRT RUPTURE TIME IN WCAP-11331
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I
SUMMARY
OF DISCUSSION, DECISIONS AND COMMITMENTS.
Andy' Gagnon called to give data concerning the calculation of PRT rupture I
t time.
At the beginning of the transient there is capacity in the PRT for
- the addition'of 19926 lba of fluid discharge..The following fluid contribu-tions to the~PRT were assumed
Seal Leakoff 0-600~ seconds 705.8 lb 600-1140 seconds 4447 lb 1140-2800 seconds 1952.9 lb Seal Iniection_
1140-2800 seconds 2752 lb Safety Valve Discharge (Intermittent) 0-2800 seconds 4140 lbm A contribution of 2166 lbm is added to account for density change of the fluid in the PRT.
Therefore, at 2800 seconds allowable discharge mass remaining = 19926 - (705.8
+ 4447 + 1952.9 + 2752 + 4140 + 2166) = 3762 lbm (still available)
After 2800 seconds:
Safety Valve Flow
= 10.2 lbm/see Seal Leakoff Flow 1.18 lbm/sec
=
Seal Injection Flow =
1.66 lbm/sec 13.04 lbm/sec
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2800.+<288 = 3088 seconds = 52 minutes
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