ENS 41318
ENS Event | |
|---|---|
06:00 Jan 5, 2005 | |
| Title | Overstress Condition on Single Failure Proof Crane Trolleys |
| Event Description | On January 5, 2005 as a part of a crane re-rate analyses and study Whiting Corporation identified an overstress condition on some hoist equalizer plates and welds. This condition is limited to the hoists of some redundant (single failure proof) cranes.
Whiting Corporation has performed a preliminary review and have isolated the problem to the family of redundant trolleys also known as single failure proof trolleys. No other types of cranes are affected. It has not been established at this time which specific redundant trolleys are impacted. This assessment will require a cases by case review. Whiting Corporation have or are attempting to contact these customers directly to notify them of this circumstance. These are the only potentially impacted customers. The hoist units identified above, are to be inspected as follows and then limited to 50% of rated capacity until such time as the units can be evaluated and/or upgraded. The following specific serial numbers can be operated at 100 Tons (SN 10403, 10388, 10389, 10510). SN 10698 is currently being evaluated and is limited in capacity by other factors being addressed with the customer. The area to visually inspect, for cracks in the plates or welds, is the assembly, adjacent to the rope termination, at each end of the equalizer arm, that the nut on the rope fitting bears against. Suspicious visual indications of potential cracks can be further examined by Magnetic Particle testing if warranted. A lack of any visible cracks during visual examination will allow the unit to be placed in operation at the 50% reduced capacity. Please note no reports of field failures or cracks have been reported as of the issuance of this notice. The following is a list of the family of redundant (single failure proof) cranes that will require a detailed evaluation. Niagara Mohawk Power - Nine Mile Point -125 Ton Exelon Corporation (Commonwealth Edison) - Dresden Station -125 Ton Exelon Corporation (Commonwealth Edison) - Quad Cities Station -125 Ton Dominion Nuclear Connecticut-North East Utilities-Millstone (Believed to be Unit 1 in Waterford)-Reactor Room Entergy Nuclear (Vermont Yankee) - Vernon Station - Reactor Room-110 Ton Neb. Public Power - Cooper Nuclear Station - Reactor Room -100 Ton Exelon Corporation (Philadelphia Electric) - Peach Bottom -125 Ton (2) (AEP) (Indiana Michigan power) - D. C. Cook Station -150 Ton Carolina Power & Light - Brunswick Station -125 Ton Southern Nuclear (Alabama Power) - Farley Plant - 125 Ton Energy Northwest (WPPSS) -Hanford Unit # 2 - Reactor Room -125 Ton Progress Energy (PGN) (Carolina Power & Light) - Robinson Station -125 Ton Mississippi Power & Light - Grand Gulf Station -150 Ton (2) Long Island Lighting - Shoreham Station -125 Ton Constellation Nuclear (Niagara Mohawk Power) - Nine Mile Point Station -125 Ton AEP (Indiana Michigan power) - D. C. Cook Station -150 Ton Indiana Michigan power - D. C. Cook Station - 20 Ton |
| Where | |
|---|---|
| Whiting Corporation Monee, Illinois (NRC Region 3) | |
| Organization: | Whiting Corporation |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+56.78 h2.366 days <br />0.338 weeks <br />0.0778 months <br />) | |
| Opened: | Mark Kwasny 14:47 Jan 7, 2005 |
| NRC Officer: | John Knoke |
| Last Updated: | Jan 7, 2005 |
| 41318 - NRC Website | |
Whiting Corporation with 10 CFR 21.21 | |
WEEKMONTHYEARENS 413182005-01-05T06:00:0005 January 2005 06:00:00
[Table view]10 CFR 21.21 Overstress Condition on Single Failure Proof Crane Trolleys 2005-01-05T06:00:00 | |