ML17326A711
| ML17326A711 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 07/10/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17326A709 | List: |
| References | |
| NUDOCS 8008140238 | |
| Download: ML17326A711 (2) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 22 TO FACILITY OPERATING LICENSE NO.
DPR-74 r
INDIANA AHD MICHIGAN ELECTRIC COMPANY DONALD C.
COOK NUCLEAR PLANT UNIT NO.
1 DOCKET NO. 50-316 Introduction By letter dated June 3, 1977, the criteria and staff positions regarding degraded gri d voltage protection were transmitted to Indiana and Michigan Electric Company (IEMEC).
In response to this, by letter dated July 22,
- 1977, IKMEC proposed degraded grid voltage protection design modifications and changes to the Technical Specifications for D. C.
Cook Units 1
and 2.
The proposal was reviewed by the Staff and our evaluation was included in Supplement Ho.
7 to the D. C.
Cook Unit 2 Safety Evaluation Report.
Sub-sequently, while reviewing the proposed modifications for Unit 1, we noted that the proposed modifications for Units 1
and 2 would not meet the requirements of IEEE-279.
Evaluat ion By letters dated December 17,
- 1979, February 22, 1980 and May 28,
- 1980, the licensee has submitted the following revised proposed modification.
Included in the submittals were the associated changes to the Technical Specifications.
a.
Voltage monitoring for the second level undervoltage protection is moved to 4 kV Class IE system from the 345 kV non-Class IE system to meet the requirements of IEEE-279-1971.
b.
Loss of voltage relay set point is changed to 80$ of bus nominal voltage from 60>>.
c.
Loss of voltage relays are arranged in two-out-of-three logic instead of two-out-of-two logic to accommodate single failure of a relay.
Based on our review of the information provided by IEMEC, we have deter-mined that the modified design for Unit 2 corrects the deficiencies discovered in our review of Unit 1.
The licensee has also submitted acceptable associated changes to the Technical Specifications.
We, therefore, conclude that the D.
C.
Cook Unit 2 design is now in fell conformance with our position on degraded grid voltage and is acceptable.
Environmental Consideration We have dete'rmined that the amendment does not author'ize a change in effluent types or total amounts nor an increase in po. er level and will not result in any significant environmental impact.
Having made this determination, we have. further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact
- and, pursuant to 10 CFR $51.5(d)(4), that an environmental impact statement or negative declaration and environ-mental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probabi lity or consequences of accidents previously considered and do not involve a si gnificant decrease in a safety margin, the amendments do not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed
- manner, and (3) such activities will be conducted in compliance with the Coranission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Date:
July 10, 1980