ML021890628
| ML021890628 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 06/06/2002 |
| From: | Szabo C - No Known Affiliation |
| To: | Subbaratnam R Office of Nuclear Reactor Regulation |
| References | |
| TAC MB5105 | |
| Download: ML021890628 (2) | |
Text
Ram Subbaratnam -'.Sum.p Volumed__
" Pagel1 From:
"Szabo, Clinton" <Clinton.Szabo@pgnmail.com>
To:
"'rxs2@nrc.gov"' <rxs2@nrc.gov>, "'""h@nrc. gov'" <jjh@nrc.gov>
Date:
6/6/02 3:18PM
Subject:
Sump Volume
- Ram, On our 6/5 phone call, Jack Hayes requested the sump volume that was used in the LOCA RADTRAD runs. The attached file provides the volumes used and a description of how the volumes were determined. As we discussed on the call, it is our intent to include this information in a supplement to the May 10th AST submittal.
Clinton Szabo Ext. 843-857-1544 Int. 450-1544
<<Additional Info-Sump Volume_2002 06-06.doc>>
CC:
"Baucom, Chuck" <chuck. baucom@pgnmail.com>, "Balakhnin, Vladislav"
<vladislav. balakhnin@pgnmail.com>, "Statile, Donald" <donald.statile@pgnmail.com>
Ram Subbaratnam - Additional infoSump Volume_2002 06-06.doc Pag Sump Volume used In HBRSEP, Unit No. 2, LOCA RADTRAD Runs Sump volume increases as a function of time as a result of drawdown from the Refueling Water Storage Tank (RWST). Volume from 21 to 40 minutes is 35,850 ft3 (volume before the initiation of ESF leakage (21 minutes) is irrelevant, since source dilution is not important before ESF release). The volume from 40 to 51.5 minutes is 40,889 ft3 and from 51.5 minutes to 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> is 43,939 ft3. A total of 3 RADTRAD runs are required to model the changing sump volume, since RADTRAD requires a constant volume definition.
The sump volume was determined as follows. The volume as a function of time consists of contributions from the RWST, three accumulators, and the RCS inventory. This calculation utilizes a RCS volume of 8,254 ft3. The water in the accumulators and RWST is cold (density of 62.4 lbs/ft3 used in the volume determination). The RCS is at 575.9 'F and 2235 psig. Based on the Steam Tables, the specific volume of the fluid is 0.02218 ft3/lb. Per RG 1.183, the density of cold water is 62.4 lbm/ft3. Thus the volume of the reactor coolant is calculated as follows:
RC VolumecoLD = 8254 ft3,
I ibm
- 5964 ft 3 0.02218 ft 3 62.4 Ibm Consequently, the volume of the ECCS Inventory is recalculated as follows:
Volume (V) = RCS Volume + three Accumulator Volumes + RWST Volume @
Time Period V2.40omin = 5,964 ft3 + (3)*825 ft3 + (205,050 gallons
- 0.13368 f 3/gallon)
V21-4o min. = 35,850 Wf3 V40
.5 min. = 5,964 ft3 + (3)*825 ft3 + (242,743 gallons
- 0.13368 ft3/gallon)
V40 - 51.5 min. = 40,889 ft3 V51.5 min.- 720 hrs = 5,964 ft3 + (3)*825 ft3 + (265,557 gallons
- 0.13368 ft/gallon)
V 51.5 min. - 720 hrs.
43,93 9 ft3 From RNP-M/MECH-1 740, Rev 0, "Radiological Consequence Analysis of the Loss of Coolant Accident With AST Implementation" iR am Su b baria'tn a 'm ' -'Aaddi{ ion *I' f6ifo Su m p Voiume 2002 06.:06.doc6