ML19211C746

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Responds to NRC 761123 Request for Info Re Degree to Which Facility Can Maintain Axial Shape Index within Required Limit.Safety Limits Area Not Violated When Shape Index Is at Limit Permitted by Limiting Conditions of Operation
ML19211C746
Person / Time
Site: Millstone Dominion icon.png
Issue date: 01/02/1980
From: Counsil W
NORTHEAST UTILITIES
To: Reid R
Office of Nuclear Reactor Regulation
References
NUDOCS 8001140393
Download: ML19211C746 (1)


Text

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January 2, 1980 Docket No. 50-336 Director of Nuclear Reactor Regulation Attn: Mr. R. Reid , Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Reference:

(1) G. Lear letter to D. C. Switzer dated November 23, 1976.

Gentlemen:

Millstone Nuclear Power Station. Unit No. 2 Axial Shane Index In response to the Reference (1) request for information regarding the degree to which Millstone Unit No. 2 can maintain the Axial Shape Index (ASI) within the required limit utilizing excore detectors, Northeast Nuclear Energy Company (NNECO) provides the following information.

The ASI limits are determined from certain physics and thermal-hydraulic charac-teristics of the core. An uncertainty is applied to these limits to account for ASl measurement uncertainty. The magnitude of this uncertainty is such that allowances for excore calibration, shape annealing, signal processing, and rod shadowing are adequately accounted for. The Millstone Unit No. 2 Technical Specification limiting condition for operation (LCO) on ASI is derived by applying this uncertainty which reduces the allowable ASI operating space such that safety limits are not violated when the indicated ASI is at the limit permitted by the ICO.

We trust that this information is responsive to the Reference (1) request.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

// l /

' 2. J W W. G. Counsil Vice President 1742 176 0 J\

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