ML17325B236
| ML17325B236 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 06/08/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17325B235 | List: |
| References | |
| NUDOCS 8906200035 | |
| Download: ML17325B236 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O. C. 20555 SAFETY EYALlIATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION INDIANA MICHIGAN POWER COMPANY DONALD C.
COOK NUCLEAR PLANT, UNITS NOS.
1 AND 2 DOCKETS NOS. 50-315 AND 50-316 1.0 0
INTRODUCTION By letter dated October 20, 1987, the Indiana Michigan Power Company (the licensee) requested amendments to the Technical Specifications (TSs) appended to Facility Operating Licenses Nos.
DPR-58 and DPR-74 for the Donald C.
Cook Plant, Units Nos.
1 and 2.
The proposed amendments would modify TS 4.1.1.4 arid its bases section to delete the requirement to measure the moderator temperature coefficient at the end of the cycle.
Technical Specification 3/4.1. 14 gives limitations on moderator temperature coefficient (MTC) to ensure that the MTC remains within the limiting conditions assumed for the FSAR accident and transient analysis.
The EOC limits, which are fn the negative
- range, are specifically provided to protect against cooldown type accidents such as steamline break.
Technical Specifications require the MTC to be measured at BOC prior to reaching 5X rated power and again toward EOC within 7 effective full-power days after reaching 300 ppm steadv state boron in the reactor coolant system (RCS).
EVALUATION The licensee has stated that the 300 ppm MTC measurement is time and resource consuming and has requested elimination of the measurement if certain restrictions on the MTC are met.
We have reviewed the justification submitted and find that it is insufficient for deletion of the requirement.
The licensee has not provided data showing that BOC MTC measurements accurately predict the EOC MTC.
Industry experience has not shown that BOC MTC measurements can be used to accurately predict the EOC MTC.
There have been some cases on other plants in which the EOC MTC measurement did not meet the criteria even though the BOC MTC measurement was acceptable.
The licensee has not shown why their plant is different from these plants or why it would be free from this type of problem.
3.0 CONCLUSION
Based on the staff's experience, we do not believe that the data from one or two plants would be sufficient to justify deletion of this measurement for those plants.
This type of amendment should be handled as a generic issue due to its industry wide implications.
Therefore, the staff concludes that NTC measurements at EOC shall be maintained in Technical Specifications.
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