ML17318A510
| ML17318A510 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 11/09/1979 |
| From: | Dolan J INDIANA MICHIGAN POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-79-24, NUDOCS 7912200687 | |
| Download: ML17318A510 (3) | |
Text
INDIANA R MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NE W YOR K, N. Y. 10004 November 9, 1979 AEP:NRC:00288 Donald C.
Cook Nuclear P n~nits 1
and 2
Docket Nos.
50-315 and 50-316+
License Nos.
DPR-58 and DP -
4
Response
to IE Bulletin 79-24 Mr. James G. Keppler, Regional Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region III 799 Roosevelt Road Glen Ellyn, IL.
60137
Dear Nr,
Keppler:
This letter responds to your letter dated September 27, 1979 which transmitted to us IE Bulletin 79-24 entitled "Frozen Lines."
The results of the review required by this Bulletin are reported below.
A review of the safety related
- process, sampling and instrument lines at the Donald C.
Cook Nuclear Plant Units 1
and 2 has determined that adequate measures have been taken to prevent their freezing during extremely cold weather.
Those lines which are exposed to the outdoor environment are protected by our heat tracing system and by insulation.
The safety related heat tracing system employed at the Donald C.
Cook Nuclear Plant utilizes two 100 percent capacity safety train oriented heat tape circuits.
Each redundant circuit is controlled by a separate thermostat which senses pipe surface temperature via a bulb strapped under the insulation.
An alarmstat which has a separate sensing bulb annunciates low pipe surface temperature both in the control room and on a remote alarm panel.
All thermostats are located on outdoor pipe sections in the coldest locations.
0 Nr: James G. Keppler, Regional Director AEP;NRC;00280 Based on our review of the design of the redundant heat tracing system and our several years of operating experience, including several severe winters, we conclude that the safety related systems at the Donald C.
Cook Nuclear Plant are adequately protected from freezing.
Very truly yours, JED:em c
.'!John E.
Dolan (,
Vice President cc:
R.
C. Callen G. Charnoff D. V. Shaller-Bridgman R.
S. Hunter R.
W. Jurgensen