ML20125D431
| ML20125D431 | |
| Person / Time | |
|---|---|
| Issue date: | 04/29/1977 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20125D401 | List: |
| References | |
| REF-GTECI-A-26, REF-GTECI-RV, TASK-A-26, TASK-OR NUDOCS 8001140301 | |
| Download: ML20125D431 (2) | |
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HEMORANDUM FOR: Th6se on Attached List
.s d-s c-DSS T. M. Novak, Chief, Reactor Systems Branch, FROM: '
SUBJECT:
REACTOR SYSTEMS BRANCH TECHNICAL POSITION ON PROTECTION DURING STARTUP OR SHUTDOWN The enclosed Branch Position and The associated basis forbases are proposed each aspect of the for resolution of the overpressure protection issue.
position is included for discussion only and will not be included in t final Branch Position.
NUREG-0138, " Staff Discussion of Fif teen Technical Issues."
It is important to point out that this position uses Appendix G as the limii for all postulated initiating events, regardless It isofrealized the probability that of that event or combination of events occurring.the probability o event is less probable than an anticipated operational occurrence and there-fore the application of the upset criteria of Appendix G to these less The probable events may represent an excessive degree initiation of an overpressure transient.
fracture limit would seem appropriate for such events, however, a brief discussion with Jim Knight suggested that the time required for MTEB to develop other 1,imits would be substantial and are not planned at this time.
Therefore, there will be no attempt to define any additional criteria less conservative than Appendix G.
Realizing this constraint, this position requires that Appendix G be applied to all possible overp offsite power.
However, RSB recommends that the applicant be permitted to propose an appropriate pressure-temperature limit curve for the lower probability events. The acceptability of this limit would be reviewed by MTEB.
Your coninents are requested by May 6,1977.
&hThomas M. Novak, Chief Reactor Systems Branch Division of Systems Safety
Enclosure:
Branch Position '
ec: (seeattached) 90017163
Contact:
T. Novak, NRR; Ext. 27460 l
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