ML20207P122
| ML20207P122 | |
| Person / Time | |
|---|---|
| Issue date: | 10/14/1988 |
| From: | Novak T NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Rossi C Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20204B107 | List: |
| References | |
| AEOD-E806, GL-87-12, IEIN-86-101, NUDOCS 8810200137 | |
| Download: ML20207P122 (1) | |
Text
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OCT 'l 41988 MEMORANDUM FOR: Charles E. Rossi, Director Division of Operational Events Assessment Office of Nuclear Reactor Regulation FROM:
Thomas M. Novak, Director Division of Safety Programs Office for Analysis and Evaluation of Operational Data SU5 JECT:
LOSS OF DECAY HEAT REMOVAL CAPABILITY DUE TO PAPID REFUELING CAVITY PUMPDOWN Enclosed is an Engineering Evaluation report concerning unanticipated vortexing of the suctions on residual heat removal (RHR) pumps encountered during pump-down of refueling cavity water level prior to establishing m'd-loop operating conditions. This vortexing could cause pump air binding, cavitation and ultimately inoperability of RHR pumps. Although several NRC communications have been issued on the subject of loss of decay heat removal capability during plant outages (including Generic Letter 87-12 "Loss of Residual Heat a.emoval While the Reactor Coolant System is Partially Filled" and Information dotice (IN)86-101 "Loss of Decay Heat Reroval Due to Loss of Fluid Levels in Reactor Coolant System"), the issue of pump vortexing dt ring pumpdown of refueling cavities prior to establishing mid-loop operations has not been specifically addressed.
AE00 suggests that a supplement to IN 86-101 be sent to all licensees and construction permittees to alert them to the specific deficiencies already observed at a number of plants. Enclosed is a proposed supplement to IN 86-101, as previously discussed between P. W. Baranowsky and L. M. Padovan of our 1
offices.
For further infomation regarding this study, please contact Mark Padovan (x24445)ofmystaff. We 511 be pleased to meet with you or your staff to discuss this report.
/rD Thomas M. Novak, Director Division of Safety Programs Office for Analysis and Evaluation of Operational Data
Enclosures:
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