ML20082E696
| ML20082E696 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/26/1991 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20082E699 | List: |
| References | |
| NUDOCS 9108010199 | |
| Download: ML20082E696 (1) | |
Text
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POWER DISTRIBUTION LIMITS SURVEILLANCE REQUIREMENTS 4.2.4.1 The QUADRANT POWER TILT RATIO shall be determined to be within the limit above 50% of RATED THERMAL POWER by:
a.
Calculating the ratio at least once per 7 days when the alarm is OPERABLE, and b.
Calculating the ratio at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> during steady-state operation when the alarm is inoperable.
4.2.4.2 The QUADRANT POWER TILT RATIO shall be determined to be within the limit when above 75% of RATED THERMAL POWER with one Power Range channel in-operable by using the movable incore detectors to confirm that the normalized symmetric power distribution, obtained frota the 4 pairs of symmetric thimble locations or from a full incore flux map per specification 3.3.3.2, is consistent with the indicated QUADRANT POWER TILT RATIO at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
6 DIABLO CANYON - UNITS 1 & 2 3/4 2-20 Amendment Nos. 63 & 62 l
ejios010199 910726 PDR ADUCK 05000275 p
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