ML20085D930
| ML20085D930 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 07/22/1983 |
| From: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.18, TASK-TM LQA8300013, NUDOCS 8307290193 | |
| Download: ML20085D930 (2) | |
Text
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GENERAL OFFICE Nebraska Public Power District
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LQA8300013 July 22, 1983 Office of Nuclear Reactor Regulation Attention:
Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission i
Washington, DC 20555
Subject:
NUREG-0737, Item II.K.3.18, " ADS Logic Modifications",
NRC Docket No. 50-298, DPR-46
Reference:
- 1) General Electric Letter RHL-83-23, CNS ADS Logic Modifications Proposal No. 656-CH009-HP1, dated June 17, 1983.
- 2) GE/BWR Owner's Group Report on NUREG-0737, Item II.K.3.18, " Modification of ADS Logic",
February, 1983.
- 3) USNRC Letter, D. B. Vassallo to J. M. Pilant, same subject, dated June 3, 1983.
Dear Mr. Vassallo:
Reference 3 required Nebraska Public Power District to choose one of two acceptable options for modification to our present ADS logic and provide a schedule for implementing the modification chosen and proposing appropriate Technical Specifications. Attached is a discussion of the applicable modi-fication.
If additional clarification on any item is necessary, please contact me.
Sincerely, Jay M. Pilant Technical Staff Manager Nuclear Power Group JMP:STS:cmk Attachment E
' l 8307290193 830722 L
PDR ADOCK 05000298 P
Attachment Nebraska Public Power District Cooper Nuclear Station NUREG-0737 Implementation Item II.K.3.18 In response to the subject item and the two acceptable options (1) elimination of the high drywell pressure permissive and addition of a manual inhibit switch, or (2) bypass of the high drywell pressure permissive after a sus-tained low water level and addition of a manual inhibit switch; the District concurs with the conclusion of this evaluation and has elected to implement option (1).
The District will take appropriate measures to implement this design change during the Fall of 1984 refueling outage.
Changes to Technical Specifications will include the removal of all references to the high drywell pressure input associated with the ADS logic.
The four pressure switches which supply the input to ADS will be removed as part of this ADS logic modification.
Removal of these pressure switches will in no way affect the operation or initiation of any remaining safety related system.
Each safety related system using a high drywell pressure as part of the initiation logic is supplied with pressure switches associated only with that system.
In addition, the proposed Technical Specifications will include a surveillance plan for the manual inhibit switch.
Use of the manual inhibit switch will be addressed in the emergency procedures.
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