ML20101G434
| ML20101G434 | |
| Person / Time | |
|---|---|
| Site: | 05200001 |
| Issue date: | 06/01/1992 |
| From: | Careway H GENERAL ELECTRIC CO. |
| To: | Pedersen R NRC |
| References | |
| NUDOCS 9206260036 | |
| Download: ML20101G434 (4) | |
Text
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...... operation and is not accessible during this period.
z The upper drywell radiation shield design differs significantly from prior BWR designs m that the upper drywell shield extends to within four inches of the drywell ceiling thereby presenting a collimated angle to the upper drywell for fuel bundles as they are raised from the core to the upper pook The design is shown in Figure 123-74. This design also protects from the remote possibility of a fuel bundle being dropped onto the refuelling bellov's in that a lip has been added to the upper drywell ceiling to shield and collin1 ate radiation streaming into the upper drywell from a fuel bundle on the be ows.
n This lip which extends 1.2 feet toward the vessel from tlie drywell ceiMng wail and is 1.7 feet in height, consists of concru with the buttom two inches of the lip made of steefwith the steel plate extending two feet into the upper drywell. The radiation fields generated by a dropped fuel bundle even ; are shown in Figure 123 74 and though not low are sufficiently low to per. lit exgress of tlie area without significant operator exposure. The radiation field as shown in Figure 123-74 runs at a maximum 560 R/hr in the far upper corner nearest the bundle, dropping to less than 300 R/hr within 50 cm and below 100 R/hr at 1.5 meters from ee corner.
1 The drywell wall is a 2m thick.........
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