ML19322D925
| ML19322D925 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/20/1977 |
| From: | Ross D Office of Nuclear Reactor Regulation |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19322D920 | List: |
| References | |
| NUDOCS 8003110214 | |
| Download: ML19322D925 (1) | |
Text
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,o UNITED ST/ ' E S g(( g NUCLEAR REGULATC n
N Reference 14
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Hote' t'o : Y r1 V. Seyfrit, Assistant Directoi, Division of,. Reactor Operations Inspection, IE
Subject:
DAVIS-BESSE 1 ABNORMAL OCCURRENCE (9/24/77)
Some areas of interest to us that are appropriate for the TE formal report are:
1.
Potential for, and core cooling consequences of, insulation debris inside containment after a LOCA.
If large pieces could break off, could they get to,.and block the sump?
2.
Tne operator's role in participating in the event should be related.
For example, the manual actions associated with the control of level in SG #2 should be described. The operator's
, decision to secure HPI flow based on pressurizer level indication should be explained.
3.
The dynamic effects of vapor formation in the reactor coolant syster during the transient (where and when it occurred, RC pump cavitation effects, RC pump seal effects, etc.) should be described.
4.
Adequacy of AFW capacity with regard to this transient are of interes t.
For example, evaluate the observed primary si.de heatup against the. design capability of one AFW train.
Also, the adequacy of the AFW actuation setpoint -(SG level) should be examined against the number of cyclic stresses allowed over the life of the plant.
jh G. C.1(-
D. F. 'Ross, Jr., Assistant Director
~
for Reactor Safety Division of Systems Safety
/
cc:
G. Mazetis&
T. Novak-Contact G. Mazetis, HRR Ext. 27341 e
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8003110
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