ML19291C040
| ML19291C040 | |
| Person / Time | |
|---|---|
| Issue date: | 01/16/1979 |
| From: | Olshinski J Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19291C039 | List: |
| References | |
| REF-GTECI-A-30, REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR NUDOCS 8001110129 | |
| Download: ML19291C040 (1) | |
Text
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Distribution: Central. File c nN IJ)h 16 '973 RSB Rdg.
01shinski Chron J. Olshinski NOTE TO:
T. M. Novak. Chief. Reactor Systems Branch. DSS
,HJu F1t0M:
J. A. 01shinski, Reactor Systems Branch DSS 7_
SUBJECT:
LOSS OF P0h(ER (A-30)
On 16 Jan. 79. I attended a meeting with P. Baranowsky (PAS? and the Sandia consultants who are evaluating loss of power events (A-30). One of the itms that was discussed was whether to include reactor coolant pump seal failure rates in the evaluations. During the discussion. I discussed the previous investigation I had conducted into expected pump seal leakage rates. Although a firs decision was not made, pump seal failure leakage rate effects will probsbly not be included in the evalu-ation. Although seal failure and subsequent leakage is expected on a loss of all power, this effect will probably be excluded for two reasons:
1.
On a loss of all power, there will be a significant discharge from the relief and safety valves. The expected leakage rates from the seals would be small in comparison to the relief valve discharge rates. The pump seal leakage would, therefore, have little effect on the time that core uncove,y is calculated to occur.
2.
As the time period for the loss of power is extended, the pump seal leik rates can be expected to become a more significant contributor to the core uncovery probability. However, the probability of restor-ation of power increases with time, so that the overall probability of a loss of power of a long duration such that the pump seal leakage rate would be considered a significant factor in core uncovery is small.
1734 253
/
John A. Olshinski
/
Reactor Systems Branch
/
Division of Systems Safety
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