ML17319B165
| ML17319B165 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 01/27/1982 |
| From: | Hunter R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:00654, AEP:NRC:654, NUDOCS 8202020201 | |
| Download: ML17319B165 (6) | |
Text
DOCKET 0500031'5 05000316 REGULATORY FORMnTION DISTRIBUTION SY
~ (RIDS)
AOCESSION NBR;8202020201 DOC ~ DATE; 82/01/27 NOTARIZED!
NO FACIL:50 315 Don'aid O ~
Cook Nuclear Power PlantE Unit 1P Indiana 8
50 316.Donald O,
Cook Nuclear Power PlantI Unit 2i Indiana 8
AUTH ~ NAME AUTHOR 'AFFILIATION HUNTERER.S.
Indiana 8 Michigan Electric Co, REiC IP ~ NAME RECIPIENT AFFILIATION DENTONiH ~ RE Office of Nuclear Reactor Regulationi Director
SUBJECT:
Responds to 811217 safety evaluationre interirr use of distributed igni'tion sys (DI'S).OIS will be manually actuated frorr control
-room upon receipt of Phase B isolation signal or inoication of inadequate core cooiin'g.
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INDIANA II MICHIGAN ELECTRIC COMPANY P. 0 BOX IB BOWI ING GREEN STATION NEW YORK, N. Y. 10004 January 27, 1982 AEP:NRC:00654 Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos. 50-315 and 50-316
. License Nos.
DPR-58 and DPR-74 SER on Interim Use of the DIS Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
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This letter responds to Mr. S. A. Varga's letter of December 17, 1981 which transmitted to us the Staff's Safety Evaluatio'n Report (SER) for interim use of the Distributed Ignition System (DIS) installed in the Donald C.. Cook Nuclear Plant.
A discussion of the accident symptoms which would result in DIS actuation is found in Attachment No.
1 to our AEP:NRC:00500F letter dated October 28, 1981.
Summarizing our earlier response, the DIS will be manually actuated from the control room upon either receipt. of an automatic Phase B Isolation signal or upon indication of an'nadequate
'ore cooling (ICC) condition.
These criteria were developed to explicitly address hypothetical accident sequences which may or may not result in Phase B Isolation and to assure that those systems required for hydrogen control were, in fact, operating prior to DIS actuation.
In Attachment No.
3 to our AEP:NRC:00500A submittal, dated April 24, 1981, the Containment Spray (CTS) and Hydrogen Skimmer (HYS) systems were identified as being required for hydrogen control; the CTS being needed for temperature and pressure control and the HYS being needed to assure adequate mixing of the containment atmosphere.
As both the CTS and HYS are automatically initiated following a Phase' Isolation, it was logical to modify the 'Phase B Procedure'o include DIS actuation.
In order to address hypothetical accidents which would not necessarily result in Phase B Isolation prior to the onset of hydrogen release into the containment, the "ICC Procedure" was modified to include manual
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activation of the HYS and CTS, if not already operating, and also manual activation of the DIS.
This activation criteria provides assurance of early DIS actuation as well as operation of the other systems required for hydrogen control.
To activate the DIS following a safety injection signal, as the NRC proposes, would assure early DIS actuation but does not provide assurance of timely HYS and CTS operation.
We have reviewed the NRC proposed actuation criteria and determined that it is neither practical nor necessary to require CTS and HYS actuation following receipt of a safety injection signal.
Therefore it is our conclusion that the existing DIS actuation criteria are preferable to actuation of the DIS following a safety injection signal.
As for the second
- item, the appropriate procedures have been modified to require tripping of the ice condenser air handling units upon actuation of the DIS as per the request contained in Mr. Varga's letter.
This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, RSH/os R. S, Hunter Vice President cc:
John E. Dolan Columbus R.
W. Jurgensen W. G. Smith Bridgman R.
C. Callen G. Charnoff Joe Williams, Jr.
NRC Resident Inspector at Cook Plant Bridgman
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