ML17194B585
| ML17194B585 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/09/1983 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17194B584 | List: |
| References | |
| NUDOCS 8306100131 | |
| Download: ML17194B585 (2) | |
Text
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UNl;ED STATES e
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 DOCKET NOS. 50-237/249 MONITORING OF ELECTRIC POWER TO THE REACTOR PROTECTION SYSTEM (RPS)
INTRODUCTION AND
SUMMARY
NRC staff concerns regarding the deficiencies in the existing design of RPS power monitoring in BWRs was transmitted to Conmonwealth Edison (CE) by NRC generic letter dated September 24, 1980.
By letters dated February 4, 1983, April 20, 1983 and May 6, 1983, CE proposed design modifications and changes to the technical specifications. A detailed review and technical evaluation of these proposed modifications and changes to the technical specifications were performed by the NRC's consultant, Lawrence Livennore Laboratory (LLL). This work-is reported in LLL Report UCID-19705, "Technical Evaluation of the Monitoring of Electric Power to the Reactor Protection System" dated May 1983 (attached). The *staff has reviewed this technical evaluation report and concurs in its conclusion that the proposed design modifications are acceptable.
EVALUATION CE proposed to install protection assemblies, designed by General Electric, two in each of the three sources of power to the RPS (RPS M-G sets A and B and the one alternate source). Each assembly includes a circuit breaker and a monitoring module consisting of an undervoltage, overvoltage and an underfrequency sensing relay.
CE has agreed to submit an application which proposes technical
. specifications for the addition of trip setpoints, limiting conditions for operation and surveillance requirements associated with the design modifications cited above.
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The criteria used by LLL in its evaluation of the proposed changes includes GDC-2, "Design Basis for Protection Against Natur~l Phenomenon,"
and GDC-21, "Protection System Reliability and Testability," of Appendix A to 10 CFR 50; IEEE-279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations;" and information provided in an NRC memorandum from F. Rosa to J. Stolz, T. Ippolito and G. Lainas dated February 19, 1979.
CONCLUSIONS The NRC staff has reviewed the LLL Technical Evaluation Report and concurs in its findings that the proposed modifications will provide automatic protection of the RPS components from sustained abnormal power supply.
Therefore, the staff concludes that GE's proposed design modifications are acceptable.
ACKNOWLEDGEMENT I. Ahmed contributed to this evaluation.
Attached:
Technical Evaluation Report Date:
June 9, 1983
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