ML19346A200
| ML19346A200 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/29/1981 |
| From: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Mark J Advisory Committee on Reactor Safeguards |
| Shared Package | |
| ML19346A201 | List: |
| References | |
| NUDOCS 8106050383 | |
| Download: ML19346A200 (2) | |
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s Dr. J. Carson Mark, Chairman ti JUI!O4 sg u -et Advisory Comittee on Reactor Safeguards g
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SUBJECT:
UNRESOLVED SAFETY ISSUE: SHUTDOWN DECAY HEAT REMDy 7 8
REQUIREMENTS TASK A-45
Dear Dr. Mark:
This is in response to your letter to Chairman Hendrie of May 12, 1981 addressing proposed modifications to the North Anna Station, Unit No. 2 low pressure injection and residual heat removal systems.
We fully concur that an aggressive development and implementation of the Task Action Plan (TAP) for Task A-45, " Shutdown Decay Heat Removal Requirements," will best serve to improve the reliability of decay heat removal systems (DHRS) for all LWRs, including North Anna. Considering the Comittee's specific coments, our TAP will give careful consideration to alternative DHRS, including those used in some foreign LWRs. The approach to this problem will not rely solely on probabilistic studies but will also utilize conventional engineering or deterministic based evaluations. With respect to resources, we agree that to accomplish in a timely fashion the ambitious program, as outlined to the Full Comittee on April 10, 1981, and to the Ad Hoc ACRS Subcommittee on DHRS on May 5, 1981, will require considerable internal staff and outside contractor.
personnel. Although we have assigned a Task iianager to A-45, we are still in the process of trying to free-up some internal staff to work directly on Task A-45. We anticipate, however, that the majority of Task A-45 work will be performed by outside contractor personnel.
In any event, our TAP will delineate in some detail internal and external manpower requirements.
Under separate cover, we are providing the Comittee with our initial draft of the TAP for Task A-45. We would appreciate the Comittee's review and comment on our draft plan, perhaps sometime during the Comittee's July 1981 meeting. We also plar. to provide the opportunity for the Comittee to review and comment on significant results from Task A-45 work at selected intennediate points in the program. On completior.
of significant milestones, we will provide the Committee with draft reports for their review and coment.
Successful accomplishment of the Task A-45 program will require a coordinated effort within the staff and with the ACRS. The Task Manager for each Unresolved Safety Issue is the key focal point within the staff for Bio (,05'O M 3
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Dr. J. Carson Mark
, technical direction and management of all tasks in the action plan and for coordination cf all efforts connected with the issue. Accordingly, close coordination between the Task Manager for A-45 and the ACRS staff and Subcomittee Chairman on Decay Heat Removal Systems is essential and appears to be well unde;' way.
Sincerely.
(Signes William 1.Dirchs William J. Dircks Executive Director for Operatior,s DISTRIBUTION Central FiTes TERA GIB Reading W. Dircks E. Cornell T. Rehm C. Michelson V. Stello R. Minogue H. Denton E. Case G. Zech T. Murley D. Eisenhut H. Hanauer R. Mattson R. Vollmer B. Snyder F. Schroeder K. Kniel P. Norian A. Marchese ED0 Reading G. Ertter (ED0-10478)
S. Cavanaugh B. Gabriel J. Mullin J. Butts A-45 File NRR R. Savio, ACRS SECY81-0668(3)
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