ML19290E314
| ML19290E314 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie, Turkey Point, Crystal River  |
| Issue date: | 02/05/1980 |
| From: | Weiner R ENERGY, DEPT. OF |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML15219A034 | List: |
| References | |
| NUDOCS 8003100208 | |
| Download: ML19290E314 (4) | |
Text
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'4$d' Cecartrn en: cf Enerr;y Washingmn, D.C. TM61 MRC-Docket Mos. 50-302 and 50-335 Mr. Harold Denton Director Office of Nuclear Reactor Regulation U.S. Muclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Centon:
This letter summarizes the views of the U.S.
Department of Energy regarding the electric system reliability impact in the Florida subregion of the Southeastern Electric Reliability Council of requiring the shutdown of more than one nuclear generating unit at the same time in February and March.
The following represents our understanding of the operating status of nuclear generating units in Flo::ida.
There are four nuclear generating units with operating licenses in Florida at the present time.
These are Turkey Point Units 3 and 4 (697 MW each), located 25 miles south of Miami; St. Lucie Unit 1 (795 MW), located 100 miles north of Miami all on the Florida Power and Light system; and Crystal River Unit 3 (797 MW), located on the Florida Power Corporation system 60 miles north of Tampa.
Turkey Point Unit 3 is currently undergoing start-up procedures, following a refueling outage during which the required off-line TMI " Lessons Learned Short-Term" modifications were made.
This unit is expected to be operating at full capacity by February 9, 1980. Turkey Point Unit 4 is operating at full capacity and has also completed the off-line modifications.
All remaining TMI " Lessons Learned Short-Term" modificaitons at the Turkey Point plant are supposed to be completed by February 15, 1980, and will not require any curtailment of the generation from these units.
There is a requirement that Turkey Point Unit 4 be shut down every six months for a detailed steam generator inspection.
The next inspection is scheduled for February 26 and is planned for one month.
Florida Power & Light has requested a delay until late April when the refurbished turbine rotors will be available for installation, thus combining two required outages.
St. Lucie Unit 1 and Crystal River Unit 3 still have to be shut down to implement " Lessons Learned Short-Term" requirements.
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Conversations with the NRC staff have indicated that Crystal River Unit 3 has been granted a waiver of the shutdown order until March 1 due to late delivery of some necessary ecuipment.
Should St. Lucie be shut down on February 16, as currently scheduled, it would return to service by the time Crystal River is to be taken of f line.
This situation would avoid having two nuclear units in Florida out of service at the same time in the latter half of February, providing Turkey Point Unit 4 is granted the extension on the steam generator inspection outage.
The timing of these various nuclear units to be shut down is different from the schedule when the snow cause order was written.
The DOE analysis of the rather complex relationship between the Florida transmission system, load center location, and nuclear unit location indicates'that the system reliability in Florida will not be adequate if St. Lucie Unit 1 is taken out of service prior to the beginning of March.
When Florida's loads decline in March,'the outages of Crystal River Unit 3 and either St. Lucie Unit 1 or Turkey Point Unit 4 can be accommodated within adequate reliability limits.
The simultaneous outage of St. Lucie Unit 1 and a Turkey Point unit in March would not provide reliable service to consumers in Southeast Florida.
The avcilable information* shows that, if St. Lucie Unit 1 is shut down for the last half of February, the resulting operating reserve margin for Florida would be 3,039 MW or 17.1 percent of the expected peak load.
Included in this figure is maximum possible import of 330 MW from the Southern Company and the continued operation of Turkey Point Unit 4.
Tne configuration of the Florida trans-mission system, the distribution of loads within the state, and the ability of the transmission ties to outside regions make this level of operating reserves inadequate to assure reliable service.
Delay of the St. Lucie outage until the beginning of March, to occur simultaneously with the two-wtek shutdown of Crystal River, along with the lower projected load levels at this time, would leave an operating reserve of 4,830 MW (33.7 percent) with Turkey Point 4 operating.
Should Turkey Point 4 also be shut down, the operating
- Information utilized was that contained in the letter of January 14, 1980, from Ms. Patsy Y. Baynard of Florida Power Corporation to Fr. Harold Denton; technical supporting documents supplied by Ylorida Power and Light Company, dated January 11, providing responses to the data requirements enumerated by NRC in the letter describing the DOE reliability analysis effort; the January 11, 1980, letter from Mr. Michael R. Gent of the Florida Coordinating Group to Mr. Richard E. Weiner; and the January 10, 1980, letter from Mr. William R. Brownlee of SERC to Mr. Harold Denton; and phone conversations with Florida Power & Light to update maintenance schedules on February 4.
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reserve margin would be 28.8 percent (4,137 MW).
These operating reserves also include a maximum import from outside the region (330 MW).
Reserves of this magnitude would be adequate for Florida considered as a single entity.
The loads in Florida are extremely sensitive to the weather at this time of year; and it would be possible to have March loads reach the February levels, especially in the early part of the month.
The Southeastern portion of Florida is a major load center located near the tip of the peninsula.
Only four transmission lines connect this area to the rest of the state.
The three Florida Power and Light nuclear units are in this area as well as other major generating plants.
These sources of power are not sufficient to meet the peak demand in the area and are normally supplemented by power imports over transmission ties to the west and the north.
These transmission ties provide an import capability of 1,500 MW.
Reliable system operation requires that enough capacity be available on these transmission lines to absorb a load increase equal to the largest generating unit operating in Southeast Florida.
This situ-ation makes it necessary to further evaluate the impact of the shutdown of St. Lucie Unit 1 on Southeast Florida separately from the overall Florida reliability margin analysis.
The operating reserve margin in Southeast Florida in the second half of February will be a negative 2.1 percent (a deficiency of 127 MW) if St. Lucie is out of service.
This margin considers a transfer into the area of 705 MW (almost the maximum that can be reliably imported).
The maximum unreliable import of 1,500 MW would provide a reserve margin of 668 MW.
This amount is insufficient to cover the outage of a Turkey Point nuclear unit and would, therefore, not be able to assure reliable service to consumers in this area.
Load levels are expected to be considerably lower in March.
This would leave an operating reserve margin of 21.1 percent (1,018 MW) if St. Lucie is taken out of service in the early part of the month, 705 MW are imported into the area, and Turkey Point Unit 4 remains in service.
Should Turkey Point Unit 4 be shut down simultaneously with St. Lucie Unit 1, the operating reserve margin in March would be 321 MW (6.6 percent).
The above analysis shows that reliable service cannot be maintained in Southeast Florida during February if any nuclear units in this area (the Turkey Point units or St. Lucie) are out of service.
Assuming normal March weather conditions, either St. Lucie Unit 1 or Turkey Point Unit 4 can be shut down at the beginning of March and not severely impact the reliability of this area of Florida.
Should both of these taits be out of service simultaneouly in March, the resulting operating reserves, including maximum reliable imports from the remainder of the state, would not be sufficient to insure reliable service to the consumers in Southeast Florida.
4 This analysis deals only with electric system reliability and energy supply; it does not consider the need to reduce operating costs and conserve oil or natural gas.
The outage of any large non-oil generating unit in Florida results in increased costs to the consumers of electricity in the state because of the resulting increased use of oil-fired generation.
The above represents an analysis done utilizing the available data.
Circumstances in the Florida power supply situation change on a daily basis, but this evaluation recognizes the more probable variations.
Any significant changes, such as a need to remove either Turkey Point nuclear unit from service to complete TMI "Short-Term" modifications, will require further analysis.
I will appreciate notification of your decision regarding the shutdown of Crystal River Unit 3 and St. Lucie Unit 1 to implement
" Lessons Learned Short-Term" changes and Turkey Point Unit 4 for its steam generator inspection.
Sincerely, b
Jt Richard E. Weiner, Director Division of Power Supply and Reliability Economic Regulatory Administration
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