ML17209A470
| ML17209A470 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 09/26/1980 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Ahearne J NRC COMMISSION (OCM) |
| Shared Package | |
| ML17209A468 | List: |
| References | |
| REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR ALAB-603, NUDOCS 8012230033 | |
| Download: ML17209A470 (3) | |
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UNlTED STATES NUCLEAR REGULATORY COMMISSION VJASHINCTON, D. C. 20555 GAP J, 0
'..",90 MiVORANDUM FOR:
Chairman Ahearne FROM:
THRU:
SUBQiCT:
Harold R. Denton, Director Office of Nuclear Reactor Regulation fSiJ-;a d) )'I'Ii28 J Dira~
ki]liam 0. Dircks, ixecutive Director or Operations STATION BLACKOUT This m morandum is in response to your request dated August 20, 1980, concerning the current s.atus of Task Action Plan A-44 in light of ALAB-603.
In ALAB-603, the Appeal Board made speciiic findings regarding St.
Lucie Unit 2, and recommended that the Comnission take expeditious ac ion to ensure that other plants and operators are equipped to accommodate a-station blackout event.
This would include items such as a thorough analysis of the.plant behavior during the blackout period, development of writ en procedures, and operator training or safe operation of the
~ facili y and restoration of AC power.
The 0 fice of Nuclear Reactor Regulation is currently evaluating the necessary actions for implementing the Appeal Board recommendation.
This effort will require contribution from several divisions, and it is expected that several weeks will be required to.develop a position for operating reac.ors and OL's under review.
We will report the results of his evaluation to the Comnission in approximately one month.-
With regard to St. Lucie Unit 1, as a result of ALAB-603, we are requiring that, the licensee implement actions similar to those required on St.
Lucie Unit 2.
Contact:
Paul
- Norian, NRR 49-294D7
Chairman Ahearne The station blackout issue is also being considered under Task Action Plan A-44 which was approved in July 1980 with a scheduled completion date of October 1982 (copy attached).
Section 3 of TAP A-44 remains valid and provides the basis for continued plant operation and licensing
~
pending completion of the action plan.
The purpose of TAP A-44 is to evaluate the adequacy of current licensing design requirements to assure that nuclear power plants do not pose an unacceptable risk of a station blackout accident.
The first effort scheduled for completion in the program involves the reassessment and documentation of a preliminary survey conducted in October 1979.
The intent of this survey was to identify any operating plants having an exceptionally high probability of station blackout accidents.
The preliminary staff effort found that there were no currently operating plants of unusually high susceptibility to a severe core damage accident resulting from a station blackout.
To take better account of analytical uncertainties, it was decided to refine the survey.
The updated assessment is scheduled for completion
, in the.last quarter of:1980.
-The longer term portions of the task action plan involve extensive use of reliability and risk. assessment s'tudies; much of this work will be
'performed by contractor personnel.
The task action plan includes a
detailed analysis of AC power supply reliability, an evaluation of potential accident sequence probabilities and consequences, and plant response analyses.
A contract was recently placed with Oak Ridge National
L b '-WRN~
and accident sequence analysis tasks.
Also, preliminary plant response
.'.-analyses for several station blackout accident scenarios are underway by the Division of Hater Reactor Safety Research.
In summary, the board recommendation for expeditious action is being considered by the current NRR evaluation of actions needed'for operating reactors.
The results will be.reported to.the Commission n'ext month.
'We believe that the longer. range. generic aspects of the ALAB'-603 recommen-dations are addressed appropriately in Task Action Pla'n A-44.
The tasks under TAP A-44 are co'ntinuing as scheduled at this time.
Enclosure:
Task Action Pl a&-..44.==-'
Harold R. Denton, Director Office of.Nuclear Reactor Regulation,,
cc:
Commissioner Hendrie
- Commissioner Gilinsky Commissioner Bradford GC PE WCY
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