ML20062P044
| ML20062P044 | |
| Person / Time | |
|---|---|
| Site: | Oconee, 05000000 |
| Issue date: | 01/10/1980 |
| From: | Caroline Hsu BROOKHAVEN NATIONAL LABORATORY |
| To: | BROOKHAVEN NATIONAL LABORATORY |
| Shared Package | |
| ML19274B854 | List: |
| References | |
| FOIA-80-515, FOIA-80-555 NUDOCS 8203020225 | |
| Download: ML20062P044 (6) | |
Text
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- N E N T G.T ;O : uf._ L/.L g,/, Ton ,
MEMORANDUM p -nq p - 21 e
- -) - 22 DATE
- Janua ry 10, 1980 To: Files C. J. Hsu FROM:
sus;EcT: B&W Overfeed Transient Analysis l Us'ing the IRT Code l
The overfeed transient analysis for a typical B&W plant was performed by using the IRT deck simulating the Oconee plant. The upperhead heat transfer is taken into consideration by properly specifying the heat transfer coefficient and the metal heat capacity in the upperhead region.
Initially, the reactor is assumed to be at 100% full power with 100% rated steam and feedwater flows and a pressurizer pressure of 2157.8 psia. The turbine l trip is initiated at t=0 and the steam flow is ramped to zero in 2.5 sec. The reactoris tripped at t=0 with 0.5 sec. delay. The integrated control system is assumed to fail, causing the continuation of normal feedwater flow to the once-through steam generator and the initiation of the auxiliary feedwater flow. Fur-thermore, when the steam bypass system becomes operational, it is assumed to mal-function and remain open. The auxiliary feedwater flow is actuated at t=1 sec.,
and ramped to its full flow capacity (about 4.1% of normal feedwater flow) at t=4 sec. The ECCS signal is turned on when the RCS pressure reaches 1615 psia. This signal also causes the RCS recirculation pump to trip. There is a delay of 16 sec. from the time of ECCS signal actuation to the time of ECCS delivery.
The computed transient results are shown in Fig.1 - Fig. 9. The initial deg-radation in the once-through steam generator heat transfer due to the turbine trip causes the primary RCS pressure to go up, but the pressure turns around quickly be-cause of the reactor scram. The rapid cooling-down of the primary side fluid causes the RCS pressure to decrease rapidly, actuating the ECCS signal at t=42.3 sec. At this time, the primary RCS recirculation pumps start to coast down follow-ing a specified coast-down curve. Because of the continuous supply of feedwater and auxiliary feedwater at the normal flow rates, the secondary-side of the once-through steam generator becomes flooded with a mixture of steam and water at 35.9
.sec., and the steamling st_ arts to discharge the two-phase mixture instead of pure
, superheated steam.. Sibce the steamline bypass . valve flow'i's dstermined based on g the chof.e . flow . correlation, this causes a su'dden jump inisteamline flow and the e corresponding drop in the steam gsherator pressure. The latter, in turn, causes the secondary-side fluid temperature (which is at saturation temperature) to drop suddenly, resulting in a momentary increase in the steam generator heat transfer rate, as can be observed in Fig. 7.
The pressurizer is emptied at t=43.47 sec. (P=1588.31 psia), and the upperhead starts to flash at t=43.74 sec. The IP.T computer outputs indicate that flashing hyg2s eloso4 MADDENeo-555 pgp
'. . !'e ;. to iiles h- . 1 : . .' T
- Pa ge h:c, tt.l:e , piace only in the upperhead region. The vcriction of stcc::. quality in the upperhead as a function of time is il10strated by curve (1) of Fig. C. Due to the ruL:tquer.t drop in the RCS pressure, (witich causes the :.;turatier, t=percture.
~
T .., to decrease), the heat transfer from the upperhead metal to the upperhead titBiphase mixture in the upperhead region increases, causing the upperhead quality to reach the value of 1.0 at t:165 sec. (Note that Q T )). In the
. calculation, the. upperhead heat transfer coefficient $s=hA(T t takEngjbgajerowhenthe-upperhead quality exceeds 0.9. .
In the meantime, the ECCS delivery starts to take place at t=58.3 se:. at the volumetric flow rate of 1000 gal ./ min.- This -ECCS flow eventually causes .the RCS pressure to turn ,around at t=135 sec. as can be seen in Fig.1. The pressuri-zer starts to refill at about t=145 sec.
-Besides the base case described above, analyses were also made for the follow-
'ing cases.
(a) ECCS flow is increased by 10%.
(b) ECCS pressure set point is raised by 100 psia.
(c) Combination of (a) and (b) above.
(d) Scram rod worth is lowered by 25%.
(e) Pressurizer area is increased by 50%.
The u)perhead quality and the pressurizer water level for case (e) are also plotted l and slown in Figures 8 and 9.i CJH:bb cc.: M. M. Levine, BNL W. G. Shier, BNL M. S. Lu, BNL H. Connell, BNL W. Y. Kato, BNL J. Jo, BNL W. S. Yu, BNL P. Farahzad, BNL F._0dar..NRC
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