ML19296B898
| ML19296B898 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 02/19/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002220344 | |
| Download: ML19296B898 (2) | |
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W LJ February 19, 1980 Director, Nuclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Nuclear Regulatory Commission Washington, DC' 20555 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT - CONSUMERS POWER COMPANY RESPONSE TO NRC LETTER DATED AUGUST 8, 1979: ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEMS VOLTAGES NRC letter dated August 8, 1979 cited an event that occurred at the Arkansas Nuclear One station and raised two generic concerns. The NRC staff'. concerns centered around,the acceptability of the voltage conditions on the station electric distribution systems with regard to both (1) potential overloading due to transfers of either safety or nonsafety loads, and (2) potential starting transient problems. These concerns ace to be addressed in the form of conformation to be provided through analysis and verification by test.
Consumers Power Company is currently performing the analysis in conjunction with the Big Rock Point Plant Undervoltage Protection Modification. This modification is scheduled for completion during the next refueling outage (October 1980).
However, the analysis should be completed by March 1, 1980.
Verification by test activities is progressing rapidly. Temporary instrumen-tation will be installed to continuously monitor voltage and current while the plant is operating. The computer model used for the analysis will be used to predict plant loads under different conditions and the loads will be verified by readings taken at the plant.
These special site test procedures are currently being reviewed by the plant staff and the test engineers. Upon completion of the test procedure review, the actual tests are expected to be completed within one month.
Consumers Power Company will perform these tests as soon as possible after the Palisades Plant tests are completed (Reference Palisades Plant Jaauary 9, 1979 letter, Docket 50-255).
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The Palisades tests must be done in conjunction with surveillance tests which are required to be performed prior to and during plant start-up.
Finalization of the analysis following the tests is expected to require approximately one month.
Therefore, a complete response addressing the NRC's concerns will be submitted by May 1980.
It should be pointed out that Big Rock Point has routinely started and operated all of its plant loads for years and never experienced transient starting problems.
Big Rock Point has also used various off-site power supplies and has experienced nearly every type of load transfer that is possible without any. overload problems.
Big Rock Point does not have the complexity that comes from meeting General Design Criteria 17 and Chapter 8 of the Standard Review Plan, therefore, with the Big Rock Point's operating experience, Consumers Power Company is confident that the NRC's concerns are not a problem for the Big Rock Point Plant.
David P Hoffman (Signed)
David P Hoffman Nuclear Licensing Administrator CC JGKeppler, USNRC