ML19289G308
| ML19289G308 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/02/1975 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Stello V Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19289G307 | List: |
| References | |
| NUDOCS 7908220425 | |
| Download: ML19289G308 (1) | |
Text
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DEC 0 2 TJS ESB Raed hg File Victor Stallo, Jr., Assistant Director for Easetor Safety, TR IZACTOR COOIANT STSTEM OTY1 PRESSURE ?10TECTION DURDfG STARTUF OE SHITrDOWN The enclosure is a first draft of a 153 generic position requiring protection against inadvertant a,,nessuriaation resulting from a single malfunction or operator error when the reactor coolant system is water solid (startup or shutdown conditions) to prevent the RCS pressure from exceeding the pressure-temperature limitations on the reactor Fessel for protection against brittle fractyre. The draft is being rewritten to conform to the requirements for a Technical Evaluation Emport in preparation for review by 211C.
Taking into consideration Section III, Subsaction H3 of the ASME Code and Appendix A of 10 CFR 50, we have categorized this tran-sient as an Opset Condition (im idant of mderate frequency). At present the position for this Upset Condition will address only a transiant initiated by a-singla operator error or single active failure without imposing further singla failures on the equipment required to mitigste the consequences of the transient, Also, those plant systems which are not adversely affected by the tran-sient will be considered to continue operation. However, these matters are still under discussion.
We would require that the reactors in operation be requestad to descastrate that adequate protection is available to preclude exceeding the pressure-temperature limitations of the irradiated reactor vessel.
For those plants presently under CP and OL review, this issue would be incinded in the revise as a part of SemnAmed Xaview Plan on laactor Coolant Pressure Boundary Overpressurization Protection.
Ecvever, it is not our intention to hold up the issuance of a CP or CL, but will, pursue this natter on the individual plant at an appropriate time.
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Thomas M. Novak, Chief Esector Systems Breach Division of Tae5 mien 1 Eaview
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