ML20137G437

Forwards,For Comment, Description of Nuclear Flux Controller 4,Nuclear Reactor Flux Regulator & Multirange Picoammeter Channel. Equipment Being Purchased to Modernize Control Circuitry

ML20137G437
Person / Time
Site:	Dow Chemical Company, 05000000
Issue date:	04/30/1971
From:	Hoyle H DOW CHEMICAL CO.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20136D183	List: IA-85-256, Requests That Encl Form Be Completed & Submitted by 760915 & Facility Emergency Plan & Implementing Procedures by 761007 in Order for NRC to Prepare Info Packets for Use in Responding to Incidents or Emergencies IA-85-258, Amend 3 Renewing License R-108 & Incorporating Security Plan as License Condition IA-85-261, Documents That Appropriate Corrective Actions Taken by Dow Chemical Co in Response to 780113 Immediate Action Ltr,Per 780207 Enforcement Conference at Facility IR 05000264/1973001 IR 05000264/1975001 IR 05000264/1977002 IR 05000264/1979003 ML20137G383 ML20137G390 ML20137G402 ML20137G410 ML20137G417 ML20137G432 ML20137G437 ML20137G446 ML20137G450 ML20137G456 ML20137G460 ML20137G467 ML20137G472 ML20137G478 ML20137G487 ML20137G507 ML20137G524 ML20137G586 ML20137G600 ML20137G614 ML20137G637 ML20137G653 ML20137G750 ML20137G793 ML20137G816 ML20137G854 ML20137G875 ML20137G888 ML20137G896 ML20137G903 ML20137G908 ML20137G916 ML20137G921 ML20137G926 ML20137G931 ML20137G940 ML20137G951 ML20137G972 ML20137G976 ML20137G983 ML20137G990 ML20137G997 ML20137H003 ... further results
References
FOIA-85-256, FOIA-85-258, FOIA-85-259, FOIA-85-261 2155, NUDOCS 8508270299
Download: ML20137G437 (2)

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g THE DOW CMEMICAL COMPANY MIDLAN D. MICHIG AN 48840 April 30,1971 1

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Division of Reactor Licensing D_

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i U.S. Atomic Energy Commission dE_b_ E M

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ffte M _P'N Gentlemen:

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With reference to our communicatiois of February 9,1971, Docket 50-264-R108, I would like to send you the enclosed copy of a descrip-tion of the Nuclear Reactor Flux Regulator and Multirange Pico-i

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ammeter Channel which we are purchasing from the manufacturer of our Dow TRIGA Reactor to modernize the control circuitry.

I We are assured by Gulf General Atomics that the design and circuits k

have been incorporated as standard equipment in the more modern consoles installed since 1967 and have proven themselves very reliable and requiring but littic maintenance. The new c1cetronics is to replace older tube-type components presently performing the same functions, so that no change in the specifications are intended.

The control rod to be employed for the flux controller has a nominal reactivity valye of $3. in our reactor. The enclosed specifications for the flux controller NFC-3 list a maximum control rod velocity of 0.43 in/sec. for a $4. rod. The latter resulting in a maximum reactivity insertion rate of $.16/sec, which is equivalent to.11*/o sik/k/sec., a value falling within our Technical Specifications.

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We are planning to install the new equipment sometime after May 25, at which time we shall carry out detailed testing of the new circuitry before using it on a routine basis.

We would appreciate hearing froin you any comments you wish to make so that we can proceed with this modernization as soon as the equipment is delivered.

Very truly yours, Lt4S C

Dr. Harold Hoyle Chairman Radiation Safety Committee 1

1701 Building YY rir enc 1.

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