ML18153C206
| ML18153C206 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/27/1990 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML18153C205 | List: |
| References | |
| NUDOCS 9005030308 | |
| Download: ML18153C206 (2) | |
Text
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ATTACHMENT 1 SURRY POWER STATION PROPOSED TECHNICAL SPECIFICATION CHANGE INOPERABLE CONTROL ROD
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e TS 3.12-8
~T and Overtemperature ~T trip settings shall be reduced by the equivalent of 2% power for every 1 % quadrant to average power tilt.
- 1.
A control rod assembly shall be considered inoperable if the assembly cannot be moved by the drive mechanism or the assembly remains misaligned from its group step demand position by more than +24 steps during the "Thermal Soak" period, as defined in Section 3.12.E.1.b, or+/- 12 steps otherwise during power operation. No tolerance limit is required in the shutdown modes, but a rod shall be considered inoperable if the rod position indicators do not verify rod movement upon demand. Additionally, a full-length control rod shall be considered inoperable if its rod drop time is greater than 2.4 seconds to dash pot entry.
- 2.
With more than one inoperable control rod assembly, as defined in 3.12.C.1, determine within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> that the SHUTDOWN MARGIN requirements of Specification 3.12.A.3.c are satisfied and be in Hot Shutdown within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
- 3.
If more than one control rod assembly in a given bank are out of J,.*
service because of a single failure external to the individual rod drive mechanism but remain trippable (i.e., programming circuitry),
the provisions of Specification 3.12.C.1 and 3.12.C.2 shall not apply. Either restore the affected assemblies to operable status in the next 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in Hot Shutdown within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
- 4.
The provisions of Specification 3.12.C.1 and 3.12.C.2 shall not apply during reactor physics tests in which the assemblies are intentionally misaligned.
- 5.
Power operation may continue with one rod inoperable provided that within one hour either:
- a.
the rod is no longer inoperable as defined in Specification 3.12.C.1, or