ML19308C484
| ML19308C484 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/30/1979 |
| From: | Lanning W NRC - NRC THREE MILE ISLAND TASK FORCE |
| To: | Parler W NRC - NRC THREE MILE ISLAND TASK FORCE |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001240643 | |
| Download: ML19308C484 (2) | |
Text
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July 30, 1979 MEMORANDUM FOR: William Parler, Group 1, Task Leader FROM:
W. Lanning, Group 1
SUBJECT:
SUMMARY
OF TMI-2 OPERATING EXPERIENCE
REFERENCES:
1.
Death and Taxes: An Investigation of the Initial Operation of Three Mile Island No. 2, Public Citizen's Health Research Group, April 5,1979 2.
Inter-0ffice Memorandum, R. Cutler to R. Arnold, "Startup Test Program History and Delay Analyses,"
GPU Service, January 23, 1979 3.
Inter-0ffice Memorandum, R. Cutler to R. Arnold, "TMI-2: Startup Test Program History and Delay Analyses," GPU Service 4.
TMI-2 Monthly Operating Reports February 1978 through March 1979 5.
Memorandum, W. Lanning to W. Parler, " Summary of Licensee Event Reports for TMI-2," May 29,1979 6.
Letter, J. Herbein to S. Varga, " Power Operation with Three Pumps," March 29, 1978 7.
Letter, S. Varga to J. Herbein, "TMI-2 Partial Loop Operation," May 3, 1978 8.
Letter, J. Herbein to S. Varga, Response to May 3 letter, May 12, 1978 9.
Memorandum, W. Lanning to W. Parler, " Review of Out-standing Items for TMI-2 License," June 28, 1979
- 10. Memorandum, W.Lanning to W. Parler, " Summary of Post-OL Actions," June 22, 1979 From February 1978 to March 1979, TMI-2 experienced at least 34 reactor trips.
Approximately one-third of these originated in the Feedwater and Condensate Systems. Reference 1 provides a good chronology of operating experience.
How-ever, there are some missing reactor trips which were not contained in the 80 01249 f p
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July 30,1979 monthly operating, but appeared on the operating log (source for References 2 and 3).
These have been added to the Unit Shutdown Summaries taken from the Monthly Operating Reports (4) and are enclosed. The LER's have been sumarized in Reference 5.
Some importance can be attached to the operating mode of TMI-2 during the period March 14 through May 17, 1978. As the result of the failure of one of the primary reactor coolant pumps, the plant was operated us'ng three' coolant pumps.
This enabled the plant to achieve criticality (Ude 2) on March 28, 1978, approximately two months sooner than could have been attained using four pumps. The Technical Specifications permit operations with three pumps.
It appears that the staff discussed operation with three pumps with the licensee. This discussion resulted in a letter from the Licensee (refarence 6) in which they voluntarily increased the nuclear power peaking factor. This is a change in,the Technical Specifications without formal approval by the NRC.
Reference 7 requested additional analyses of 3-pump operation for longer term operation.
The licensee responded in Reference 8 that the disabled pump had been fixed and that it was not necessary to further define L.fety margins.
It appears that no analyses were completed to justify temporary 3-pump operation.
During this two-month period, a number of preoperational tests were completed.
These included control rod group rod drop testing, zero power physics testing, rod worth measurements, power escalation testing.
It appears that the reduced flow and possible slight power redistribution would not have any adverse effects on the outcome of these tests.
(RonHapswillstudyindetail).
Changes to the operating license and other post-OL actions are summarized in References 9 and 10.
A plot showing the reactor power levels as a function of time is contained in (Reference 2).
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Enclosures:
1.
Sumary of Reactor Trips 2.
Operating power history
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