ML19345A673
| ML19345A673 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/18/1972 |
| From: | Johnson W YANKEE ATOMIC ELECTRIC CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8011240509 | |
| Download: ML19345A673 (3) | |
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YANKEE ATOMIC ELECTRIC COMPANY s mi o,
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United States Atomic Energy Commission C
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Attention: Directorate of Licensing e
Reference:
License No. EPR-3 (Docket No. 50-29
Dear Sirs:
This letter is written to advise the Atomic Energy Commission that Yankee Atomic Electric Company (Yankee) has contracted for the design, manufacture and installation of a new in-core instrumentation package "eggerate", new reactor vessel head conoseals, and a new two drive culti-path moveable incore fission detector monitoring system.
Present plans are to incorporate these modifications during the 1973 fall refueling outage.
During the design and construction of the Yankee plant, one of the industry's first incore monitoring systems was designed and installed. This system was a culti-path, multi-drive flux wire irra-diation system.
Data from the system proved most valuable in obtain-ing data (hot channel factor, DNB ratio and power distribution data) used to evaluate operating c ore performance, design future cores and to cbtain increasai in the licensed plant steady state power out-put.
(392, 485, 540.nd 600 MW thermal)
During the plant twelve year operating history, the in-core monitoring systems have required many repairs and/or modifications to keep the system operable. Difficulties have been experienced with the drives, the controls and particularly with the reactor vessel head conoseals.
(Especially during start-up following refueling outages)
Experience at other plants, such as Connecticut Yankee, and technological improvements in the incore monitoring field indicate that moveable fission chambers provide better data (higher accuracy and repeatability) and fewer operating and maintainance problems.
In order to accomodate moveable fission chambers at Yankee a re-design of the outlined areas is required. The redesign is currently 8 o n 24'o g
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,U.S.Ato ic Energy Co==. September 18, 1972 in progress by Westinghouse Electric Corporation and upon completion will be forwarded to the Co= mission by Yankee via a Proposed Change for your review and approval.
k*e, rust that you will find this approach acceptable; however, should you desire additional inforuatiori, feel free. to contact us.
Very truly yours, Yankee Ato ic Electric Co.
- >1[.r w M4X9 Wendell P. I nson Assistant Vice President kTJ/er 5197
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8 AEC DISTRIBUTION FOR PART 50 DOCXET MATERIAL
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