ML19290C329
| ML19290C329 | |
| Person / Time | |
|---|---|
| Issue date: | 01/15/1979 |
| From: | Klinger G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19290C325 | List: |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, TASK-A-36, TASK-OR NUDOCS 8001100534 | |
| Download: ML19290C329 (2) | |
Text
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l'.E!ORANDUM FOR:t CGI Eisenhut,. A/D for Systems & Projects, DOR, NRR
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G. R. Klingler, Acting A/D for Field Coordinaticn, CROI, IE
SUBJECT:
CONTROL OF HEAVY OBJECTS NEAR SPENT FUEL In general during a refueling outage, Technical Specifications require that containment integrity be maintained only during core alterations or the novement of irradiated fuel within the containment.
Adcitionally, t?e T/S decay time requirements prior to fuel movement do not prohibit reactor vessel head removal.
The T/S permit a licensee to renove the reactor vessel head without maintaining containment integrity a short ti~.e after rcactor shutdown.
I We anderstand fr.om discussions with members of your staff that a review of postulated Fuel Handling Accidents Inside Containment is currently being performed as part of the evaluation of FHAIC.
RIV has fonvarded i
a postulated accident which we recommer.d for consideration as a part of Technical Activity A-36.
This postulated Accident could result in the release of fission products l
to the environs in excess of the guidelines stated in 10 CFR 100. The ccnditions of this accident are:
a) reactor head removed and irradiated fuel exposed, b) containment integrity not maintained, and c) a seismic a: cent causing a heavy object to fall into and damage tne exposed core.
Scecifically, at Fort Calho'un Station, four concrete missile shields weighing 10 tons each are stacked approximately 44 feet above the reactor vessel flange duri.ng a. refueling outage.
This occurs when the equipment hatch is open and the reactor vessel head has been removed.
If an earthquake caused these missile shields to fall into the exposed core the activity released would not be confined inside the containment.
!!hile the Fort Calhoun missile shield design and laydown location are not typical, there appears to be a potential for heavy objects such as a missile shield, cable tray or ventilation duct, etc., to damage M~
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exposed fuel in the event of an earthquake. We are forwarding this information for your review and possible inclusion as part of the FHAiC evaluation.
Please inform me of any action taken.
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G. R. Klingler, Acting A/D for Field Coordination Division of Reactor Operations Inspection, IE cc:
G. L. Madsen, RIV 1728 285 O
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