ML20008D662
| ML20008D662 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 01/29/1979 |
| From: | Justin Fuller PUBLIC SERVICE CO. OF COLORADO |
| To: | Gammill W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20008D663 | List: |
| References | |
| P-79032, NUDOCS 7902010080 | |
| Download: ML20008D662 (2) | |
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pubue service company e CcBo m 50 P C.SCX 240 CENVER.CCLCPACO 9C201 January 29, 1979 Fort St. Vrain Unit No. 1 P-79032 Mr. William P. Gamill Assistant Director for Standardi:ation and Advanced Reactors Division of Project Manageme.nt.
U.S. Nuclear Regulatory Comission Washington 0.C.
20555 Docket #50-267
Subject:
November 4 and December 12 and 17, 1978 Temperature Fluc+.Jation Events
References:
- 1) PSC/GAC/NRC Meeting -
December 14, 1978
- 2) Speis to Fuller Letter Cated January 10, 1979 Gentlemen:
Please fir.d attached the repor: " Fluctuation Events of November i and December 12, 1978, Evaluation and Resultant Revisions to Normal and Test Opera-ting Procedures".
This :ccuments, per your request, the information previously presented to you in meetings on November 16 and December 14, 1978, as a condi-tion for approval of further fluctuation testing below 70". powu itnin the proposed revision to the RT-500 test. The report contains, also per request, plots of fluctuation parameters with symbols that permit evaluation of chroro-logical trends plus the references on prior scale flow testing conducted by General Atomic.
An assessment of the data did not show any apparent chronological trends regarding parameter amplitudes during fluctuations nor did the assessment indicate that the fluctuations within the imposed test limits compromise plant safety or invalidate the constraints of the Technical Specifications.
The latest data for fluctuation initiation points relative to the current thres-hold lines appear to be inconsistent witn previous data.
It is considered essential for the current core (Cycle 1) to systemat'A cally establish the fluctuation threshold line.
This data then can be ccm-t-P
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Mr. William P. Gammill January 29., 1979 Page 2 pared to the fluctuation threshold tira when systematically established in Cycle 2.
With the forthcoming refueling outage currently scheduled for about March 4,1979, your approval for renewed RT-500 testing is required by Feb-ruary 14,1979. This will allow two (2) weeks for the ccmpletion of RT-500 testing which is sufficient.
Again, we emphasize that we believe it is essential to systematically 6:tablish the fluctuation threshold line for the current cycle for comparison We would be pleased to discuss any questions you may have regard-to Cycle 2.
ing this request for release' t5 complete fluctuation testing for Cycle 1.
The attached material is responsive to items 1 through 5 of the Speis to Fuller letter dated January 10, 1979. The information requested in item 6 had been forwarded in previous communications with the NRC.
Item 7 of the referenced letter will be responded to in a separate letter.
If there are any questions, please let us know.
Very truly yours,
/
J.K. Fuller, Vice President Engineering and Planning JKF/FES:ler Attachment r
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