ML20041A108
| ML20041A108 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 02/05/1982 |
| From: | Lentine F COMMONWEALTH EDISON CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-1.C.1, TASK-TM GL-81-21, IEC-80-15, NUDOCS 8202190107 | |
| Download: ML20041A108 (2) | |
Text
f- /~
f'_,N; Comesonwealth Edison -
/
) one F rst Nati!nal Plaza Chicago, Illinois
\\ C / Ad(ress Reply tx P st Offica Box 767 '
'7 Chicago, Illinois 60690 N
February 5, 1982 W
g co 4
Mr.'Darrell G. Eisenhut, Director q
Division of Licensing U.S. Nuclear Regulatory Commission E
'5CC3II/SD-Washington, DC 20555 C
S pEB1 g 199g,,
Subject:
Zion Station Units 1 and 2 Response to Generic Letter 81-21 N
Natural Circulation Cooldown
,y NRC Docket Nos. 50-29 5 and 50-304 References (a):
May 5, 1981, letter from D. G. Eisenhut to All PWR Licensees.
(b):
June 20, 1980, letter from J. G.
Keppler to Cordell Reed.
(c):
April 20, 1981, letter from R. W. Jurgensen to P.S. Check (Letter OG-57).
(d):
November 30, 1981, letter from R.W.
Jurgensen to D. G. Eisenhut (Letter OG-64).
Dear Mr. Eisenhut:
This letter provides Commonwealth Edison's response to the subject Generic Letter for Zion Station.
Our review of this matter was completed in November, 1981; however, due-to an oversight, the results of our review were not transmitted to your office.
On June 23, 1980, we received I.E. Circular 80-15 concerning the St. Lucie cooldown of June 11, 1980.
As a result of our review of that circular, additional guidance was placed in Zion's natural circulation cooldown procedure.
This guidance alerts the
-operator to the possibility that voiding may occur in the vessel upper head; describes the symptoms that may be indicative of 'such an-occurrence (erratic pressurizer level indication, etc.); and provides instruction for correcting the condition (holding the plant at an intermediate condition to allow fluid in the upper vessel to equili-brate with the rest of the primary system. )
These procedures have been in ef fect since September, 1980.
In support o f the Westinghouse Owners Group, of which Commonwealth Edison is a member, Westinghouse performed a study to address the potential for void formation in Westinghouse plants I(od' 58 '
gga;gggggg m P
J-D. G.fEisenhut February 5, 1982 during natural circulation cooldown.
The results of this study have been submitted to the NRC (reference (c)) and are applicable to Zion.
In addition, the Westinghouse Owners Group has developed a natural circulation cooldown guideline that takes the results of the study into account so as to preclude void formation in the upper head region.
The Westinghouse Owners Group generic guidelines have been submitted to the NRC in reference (d).
The recommendations of the generic guidelines will be incorporated into Zion's procedures in accordance with the schedule for NUREG 0737 Item I.C.1, which is dependent upon the NRC's review and approval of the guidelines.
Our re-review of-natural circulation cooldown conducted in response to Generic Letter 81-21 confirmed that this subject has been incorporated into our operator training programs.
Discussions of the St. Lucie event and the process of natural circulation in general are included in both the initial license training and requalification programs.
In addition, operators receive practical instruction on the Zion simulator in natural circulation cooldown operations.
Finally, it has been verified that adherence to present administrative limits on minimum condensate storate tank-level will ensure the availability of a suf ficient supply of auxiliary feedwater
, to support cooldown in the manner prescribed in the Westinghouse Owners Group guidelines.
Please address questions concerning this matter to this o f fice.
Very truly yours, ff F. G. Lentine Nuclear Licensing Administrator cc:
Zion Resident Inspector FGL/Im 3407N
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