ML19260C480
| ML19260C480 | |
| Person / Time | |
|---|---|
| Issue date: | 08/23/1979 |
| From: | Schroeder F Office of Nuclear Reactor Regulation |
| To: | ENERGY, DEPT. OF |
| Shared Package | |
| ML19260C481 | List: |
| References | |
| CON-FIN-A-3318, REF-GTECI-A-03, REF-GTECI-A-04, REF-GTECI-A-05, REF-GTECI-A-09, REF-GTECI-SG, REF-GTECI-SY, TASK-A-03, TASK-A-04, TASK-A-05, TASK-A-09, TASK-A-3, TASK-A-4, TASK-A-5, TASK-A-9, TASK-OR NUDOCS 8001030669 | |
| Download: ML19260C480 (1) | |
Text
ENCLOSURE 2 Scope of Work - ATWS Audit Calculations PWRs Perform audit calculations using the RELAP3B program for the following transients for the, vendors as shown:
Vendors Base Cases W
Loss of Feedwater with a Yes Yes Yes Stuck Open Safety Valve 2.
Inadvertent Opening of the Yes Yes Yes Relief Valve 3.
Inadvertent Opening of the Yes Yes Yes Safety Valve 4.
Loss of Offsite Power with No No Yes a Stuck Open Safety Valve Sensitivity Studies 1.
Loss of Feedwater with a Stuck Open Safety Valve a.
Sensitivity of HPSI Characteristics Yes Yes No b.
Sensitivity to Aux.
No No Yes Feed Delay 2.
Inadvertent Opening of a Relief Valve a.
Sensitivity to HPSI Characteristics Yes Yes No 3.
Inadvertent Opening of a Safety Valve a.
Sensitivity to HPSI Characteristics Yes Yes No b.
Sensitivity to Reactor Coolant Pump Trip Yes Yes Yes 8001030 r
1700 067
2 The input parameters for the base cases will be best estimate except that 1) the moderator temperature coefficient is more negative than that predicted to exist for more than 95% of the time that a reactor is critical and 2) the flow discharge rates through the relief and safety valves will be calculated using the homogeneous equilibrium model.
All computer runs will be performed until equilibrium mass (i.e., the mass influx is approximately equal to the mass efflux) and plant conditions (such as temperature, pressure, power, etc.) are reached.
The mixture level in the core should be calculated or conservatively estimated to check for core uncovering.
BWRs There is no change in the scope of work as specified in Reference 1 which is presented here as Enclosure 3.
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