ML17324B212
| ML17324B212 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 01/21/1987 |
| From: | Israel S NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Rubin S NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| Shared Package | |
| ML17324B213 | List: |
| References | |
| AEOD-E701, NUDOCS 8702030171 | |
| Download: ML17324B212 (4) | |
Text
January 21, 19 MEMORANDUM FOR:
Stuart Rubin, Chief Reactor Operations Analysis Branch Office for Analysis and Evaluation of Operational Data AEOD/E701 THRU:
FROM:
SUBJECT:
Peter Lam, Chief Reactor Systems Section 2
Reactor OperationsAnalysis Branch Office for Analysis and Evaluation of Operational Data Sanford Israel, Senior Reactor Systems Engineer Reactor Systems Section 2
Reactor Operations Analysis Branch Office for Analysis and Evaluation of Operational Data POTENTIAL CONTAINMENT AIRLOCK WINDOW FAILURE DUE TO RADIATION Enclosed for your consideration is an engineering evaluation report on the above subject which was identified at the D.C.
Cook plant.
A vendor report noted that samples of glass used in airlock windows shattered in a beta radiation test.
The D.C.
Cook plant has two airlocks in each unit.
The licensee decided to install a 3/8-inch thick cover plate over the inner airlock windows inspite of the uncertainty in the applicability of the test results to potential events at his plant.
Our limited investigation noted that airlock windows are used at other plants and that failure of the windows could compromise containment integrity following design basis accidents or severe core damage accidents.
We found that the beta dose rates used in the tests were significantly higher than those anticipated for LOCAs or core-melt events.
- However, because the precise failure mechanism remains unknown, there is uncertainty that the windows would maintain their integrity at the lower dose rates.
Therefore, we suggest that the acceptability of airlock windows with respect to design basis accidents be rereviewed by NRR.
Our review also noted some degradation in fracture strength for windows receiving a high integrated gamma dose.
Even though this degradation does not reduce the glass window capability to below containment design pressures, 8702030171 870121%
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Therefore, we suggest that the airlock windows be reviewed as part of the Severe Accident Program.
Original signed by Sanford Israel, Sr. Reactor Systems Engineer Reactor Operations Analysis Branch Office for Analysis and Evaluation of Operational Data
Enclosure:
As stated DISTRIBUTION:
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