ML20129J772
| ML20129J772 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/01/1996 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-96501, NUDOCS 9611080043 | |
| Download: ML20129J772 (26) | |
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_q Log # TXX 96501 lllllllll= =
File # 10010 j
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7UELECTRIC November 1, 1996 C. Lance Terry Group Ykr President U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555 1
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET N05. 50 445 AND 50 446 4
LARGE BREAK LOCA ANALYSIS, SUPPLEMENTAL INFORMATION REF:
Letter logged TXX 96497, Dated October 25, 1996, from C.L. Terry to the NRC Gentlemen:
Per your request, attached is plant specific information from the T00DEE2 hot rod heatup calculations regarding the calculated peak clad temperature.
Please contact Dr. W. G. Choe at (214) 812 4371 or Mr. J. D. Seawright at (817) 897 0140 if you have any questions in this regard.
Sincerely, i
C. L. Terry 070094 87:
an 9611000043 961101 yDR ADOCK 05000445 Docket Licensing Manager PDR
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JDS/grp Attachment c-Mr. L. J. Callan, Region IV Mr. T. J. Polich, NRR Mr. J. I. Tapia, Region IV Resident Inspector, CPSES P. O. Box 1002 Glen Rose. Texas 76043 s
3
. Attachment to TXX 96501 Page 1 of 25-C:s2 LB16J (Unit 1)
LB16Z (Unit 1)
LB23W (Unit 2)
LB23X (Unit 2)
Fa 2.42 2.40 2.42 2.40 Axiil Shxpe Peak 7.75' 7.75' 7.75' 7.75' K,
0.978125 0.978125 0.978125 0.978125 Tctal Prking (Fa x K,)
2.3670 2.3475 2.3670 2.3475 initial Clid Temp. at PCT node 1237.8 'F 1231.1 'F 1244.4 'F 1238.2 'F Initial LHGR (for peak node, at start
-0.63 kw/ft
-0.63 kw/ft
-0.63 kw/ft
-0.63 kw/ft cf REFLOOD)
Initi:1 Subcooling 135.9 'F 135.9 'F 135.9 'F 135.9 'F PCT 2055.0 'F 2112.1 'F 2047.8 'F 2036.0 'F Tima cf PCT 66.7 sec 79.7 sec 67.3 sec 75.3 sec R:fl2cd (BOCREC) time-38.0 sec 38.0 sec 38.0 sec 38.0 see Tims cf PCT after BOCREC 28.7 sec 41.7 sec 29.3 sec 37.3 sec Tzmp rtry Assessment for Reflood No Yes No Yes i
Hsct TrInsfer Coefficient?
l Convective Heat Transfer Coefficient Plots:
Note that the heat transfer coefficient plotted i
pertains only to convection. Up until approximately 50.0 seconds, the heat transfer mode is radiation.
Reflood Rate Plots:
The reflood rate levels off at approximately 50.0 seconds due to the competing effects of the slight depressurization (increases flooding rate) and decrease in ECCS flow (decreases flooding rate) due to the runout of the accumulators.
1 Quench Level Plots:
The blip seen in all of the Quench level versus time plots at approximately 50.0 seconds is due to the runout of the accumulators. The emptying of the accumulators causes a slight depressurization in the reactor vessel, which induces an increase in the quench front up the core. This increase in quench level causes greater steam production, which repressurizes the primary system, and quench level is seen to return to the original trend.
Note that in TOODEE2, a constant core inlet subcooled margin is assumed. The initialintet subcooled margin is retained throughout the calculation, and Tw,is " backed out" of the saturated temperature and assumed subcooled margin. This is conservative, as the Tw,, calculated assuming a constant subcooled margin is higher than is actually the case (subcooled margin increases during the course of the LOCA due to the cooler ECCS flow entering the lower plenum).
Note that the reflood rate plotted for cases LB16ZTD2 and LB23XTD2 (pages 10 and 22) are the actual reflood rates. However, in the TOODEE2 run, the reflood rate was manually adjusted to 1.77001 in/sec for all reflood rates between 1.0 and 1.77 in/sec in order to decrease the reflood heat transfer coefficient.
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