ML17037C345

Letter Requesting That Niagara Mohawk Obtain Measurements of Primary Coolant Samples Taken at a Frequency Consistent with Changing Operating Parameters and That a Representative Attend the Meeting on September 23, 1971

ML17037C345
Person / Time
Site:	Nine Mile Point
Issue date:	09/08/1971
From:	Morris P US Atomic Energy Commission (AEC)
To:	Brosnan T Niagara Mohawk Power Corp
References
Download: ML17037C345 (4)

Text

Docket No. 50-220 DISTRIBUTION:

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Niagara Mohawk Power Corporation ATTN:

Thomas J. Brosnan Vice President and Chief Engineer 300 Erie Boulevard Hest

Syracuse, New York 13202 Gentlemen:

It has been of interest in the nuclear industry that in some reactors fueled with UO, power changes may be followed by an increase in the iodine content in the primary coolant.

Data taken yt the X'suruga power reactor from April to May 1970 indicate that following shutdown of the

reactor, the I-131 concentration, in the primary coolant increased temporarily by a factor of one hundred or more.

In,order to understand this phenomenon better, we request that you obtain measurements at the Nine Mile Point Nuclear Station of primary coolant samples, taken at a frequency consistent with changing operating paxameters, e.g.,

variation in power level and, primary coolant cleanup.

Samples taken from gust before shutdown unti1 the iodine content in the primary system levels off would also be important.

We plan to discuss this potential problem at a meeting in our Bethesda office on September 23,, 1971.

We request that you send a representative and provide any pertinent data you might have.

Sincerely, Original signed bY F. Scbrocdcr Peter A. Morris, Director Division of Reactor Licensing cc:

Arvin E. Upton, Esquire LeBoeuf, Lamb, Leiby and MacRae 1821 Jefferson Place, N. H.

Washington, D. C.

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0 UNITED STATES ATOMIC ENERGY COMMISSION WASHINGTON. O.C.

20545 Docket: No. 50-220 SEP 8-

't971 Niagara Hohawk Power,,Carporation ATTN:

Thomas J.

Brosnan Vice President.and Chief Engineer 300 Erie Boulevard West

Syracuse, New York 13202 Gentlemen:

Xt has been of intexest in the nuclear industry that in some reactors fueled with U02, power changes may be followed by an increase in the iodine content. in the primary coolant.

Data taken at the Tsuruga power reactor from April to Hay 1970 indicate that following shutdown of the

reactor, the I-131 concentration in the primary coolant increased temporarily by a fact:or ox one hundred or more.

Xn order to understand this phenomenon better, we request that you obtain measurements at the Nine Hile Point Nuclear Station of primary coolant samples, taken at a frequency consistent with changing operating parameters, e.g.,

variat:ion in power level and primary coolant cleanup.

Samples taken from just before shutdown until the iodine content in the primary system levels off would also be important.

We plan t:o discuss this potential problem at a meeting in our Bethesda office on September 23, 1971.

We request that you send a representative and provide any pertinent dat:a you might: have.

Sincerely, Peter'.

Horris, Director Division of Reactor Licensing cc:

Arvin E. Upton, Esquire

LeBoeuf, Lamb, Leiby, and HacRae 1821 Jefferson Place, N. W.

Washington, D. C.

20036

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