ML20132B162
| ML20132B162 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 07/12/1985 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20132B168 | List: |
| References | |
| NUDOCS 8507230467 | |
| Download: ML20132B162 (2) | |
Text
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DAEC-1 4.
Reactivity Anomalies During each fuel cycle excess operative reactivity varies as fuel depletes and i
as any burnable poison in supplementary control is burned.
The magnitude of l119 this excess reactivity may be inferred from the critical rod configuration.
As fuel burnup progresses, anomalous behavior'in the excess reactivity may be detected by comparison of the critical rod pattern at selected base states to i
the predicted rod inventory at that state.
Power operating base conditions provide the most sensitive and directly interpretable data relative to core reactivity. Furthermore, using power operating base conditions permits
)
frequent reactivity comparisons.
Requiring a reactivity comparison at the specified frequency assures that a comparison will be made before the core reactivity change exceeds 1% AK.
Deviations in core reactivity gree.ter than 1% AK are not expected and require thorough evaluation. One percent reactivity limit is considered safe since an -
insertion of the reactivity into the core would not lead to transients exceeding design conditions of the reactor system.
S.
Recirculation Pumps l
APRM ard/or LPRM oscillations in excess of those specified in section 3.3.E could be an indication that a condition of thermal hydraulic instability exists and that appropriate remedial action should be taken.
These specifications are 119 based upon the guidance of GE SIL #380, Rev.1, 2/10/84.
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Amendment No. 120 3.3-19 l120 0507230467 850712 PDR ADOCK 05000331 P
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lowa Electric Light *& Power Company Technical 5peciffcations Thornal Power vs Care Flow t;1mits for Thermal Hydray1fc Stability surve11Tance
, Amendment No. M, 120 F1aure 3.3-1 3.3-21 l12
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