ML20072S751
| ML20072S751 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/30/1983 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20072S072 | List: |
| References | |
| NUDOCS 8304070324 | |
| Download: ML20072S751 (2) | |
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.j SAFETY EVALUATION REPORT 0YSTER CREEK NUCLEAR GENERATING STATION DOCKET NO. 50-219 MONITORING OF ELECTRIC POWER TO THE REACTOR PROTECTION SYSTEM (RPS)
Introduction and Summary Our concerns regarding the deficiencies in the existing design of RPS power monitoring in BWRs was transmitted to General Public Utilities (GPU) by NRC generic letter dated September 24, 1980.
In response to this, by letters dated December 4,1980, April 29,1982 and October 18,1982, GPU proposed design modifications and relay set points. A detailed review and technical evaluation of these proposed modifications and relay set points were performed by Lawrence Livermore Laboratory (LLL) unifer contract to the NRC, and with general supervision by NRC ' staff.
This work is reported in LLL report UCID-19472, " Technical Evaluation of the Monitoring of Electric Power to the Reactor Protection System" dated Febr'uary 1983 (attached). We have reviewed this technical evaluation l
report and concur. in its conclusion that the proposed design modifications-and relay set points are acceptable.
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l Proposed Changes and Evaluation Criteria l
The following design mod'ifications were proposed by GPU with a commitment to submit the technical specification changes during the Cycle II refueling outage scheduled for mid-1985.
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Installation of GE designed protection assemblies, two in each of the three sources of power to the RPS (two M-G sets and the one alternate source). Each assembly includes a circuit breaker and a monitoring module consisting of an undervoltage, overvoltage and an under-frequency sensing relay.
The criteria used by LLL in its technical evaluation of the proposed changes includes GDC-2 " Design Basis for Protection Against Natural Phenomena," and GDC-21, " Protection System Reliability and Testability,"
of Appendix A to 10 CFR 50; IEEE-279-1971, " Criteria for Protection Syste'ms for Nuclear Power Generating Stations"; and NRC memorandum from F. Rosa to J. Stolz, T. Ippolito and G. Laina's dated February 19, 1979._
Conclusions We have reviewed the LLL technical evaluation report and concur in its finding that the proposed modifications and relay set points will provide automatic protection to the RPS components from sustained abnormal power supply.
The technical specification changes, when submitted, shall have relay set points based on actual ceasured voltage. The LCO and surveillance requirements, as outlined in model technical specification shall be evaluated in a separate SER. Therefore, we conclude that GPU's proposed design modifications and relay set points to be included in the technical specifications are acceptable.
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