ML17272B066

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Responds to IE Bulletin 79-24 Re Freezing lines.Safety- Related Process,Instrument & Sampling Lines Do Not Freeze During Extremely Cold Weather
ML17272B066
Person / Time
Site: Harris  Duke Energy icon.png
Issue date: 11/06/1979
From: Mcduffie M
CAROLINA POWER & LIGHT CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-79-24, NUDOCS 7911280032
Download: ML17272B066 (2)


Text

CPKII r P Carolina Power & Light Company November 6, 1979 Mr. James P. O'Reilly, Director Region II United States Nuclear Regulatory Commission 101 Marietta Street Atlanta, Georgia 30303 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3 AND 4 DOCKET NOS. 50-400, 50-401, 50-402, AND 50-403 IE BULLETIN 79-24

Dear Mr. O'Reilly:

Carolina Power & Light Company (CP&L) has reviewed the design of protective measures to assure that safety related process, instrument and sampling lines do not freeze during extremely cold weather. The freeze protection system for the Shearon Harris Nuclear Power Plant (SHNPP) is being procured to meet the following design requirements:

(1) Freeze protected piping at SHNPP will be maintained at a temperature of 40'F or above.

(2) The freeze protection panel is activated if the ambient temperature in the area of any portion of the protected piping system falls to 40'F or less. Activation is by one of two ambient sensing temperature controllers connected in parallel.

(3) The freeze protection system is designed for an ambient temperature of <<2 F in conjunction with maximum wind velocity.

(4) A low temperature alarm will actuate if the freeze protection panel fails to energize at 35'F or less.

I (5) Ambient sensing temperature controllers will be located in areas anticipated to be exposed to the coldest temperatures.

Carolina Power & Light Company believes that this system vill provide adequate freeze protection for safety related piping systems during periods of cold weather.

Yours very truly, 3 d. Bc~

M. A. McDuffie Senior Vice President Engineering & Construction

~fAM/gcb 411 Fayettevitte Street ~ P. O. Box 1551 ~ Raleigh, N. C. 27602

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