ML17252B138

Letter Regarding Response to the Item Noted Under Enforcement Action in Inspection Report 05000249/1976020 - Dresden Unit 3

ML17252B138
Person / Time
Site:	Dresden
Issue date:	11/08/1976
From:	Bolger R Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
IR 1976020
Download: ML17252B138 (2)

Text

.} '. ... ,,_ . :\ Mr. James G. Keppler, Director Directorate

• of Inspection and Enforcement

-Region III U.S. F!uclear Regulatory Conunission 799 Roosevelt Road Glen Ellyn, Illinois 60137 November 8, 1976 Su1.:>j0ct:

Dresde.n Station Unit 3

Dear Mr. Keppler:

Response to IE.Inspection Report No. 50-249/76-20 NRC *Docket No. SO-i49 Attached is Commonwealth Edison's response to the item noted under Enforcement Action in the subject report. Neither this response nor the subject inspection report contain proprietary information.

Please address any questions on the *matter to this office. Very truly yours, U, f/001-;/ R. L. . Assistant Vice President Attachment NOV 10 i976 \

Commonwealth Edison Company Dkt.

Attc:oi_chment Infraction:

Failu:ce to verify fuel grapple "Hoist Loaded" light . . Discussion:

Dm:ing unloading the fuel from the Dresden Unit 3 reactor, Procedure DFP 800-10 step F.l.h was not followed completely.

Step F.l.h reads as follows: "Slov1ly raise the grapple, using the grapple lever and the load fl9at switch, and verify that the fuel assembly is moving up as follov1s:

1) The *slack cable indicator light should go out. . 2) The hoist loaded indicator ligb.ts".

During this particular operation, the **Hoist Loaded" indicator "1:1as not during the .t"irst few feet of lifting the from the reactor core. The load cell had been checked using the 400 pound grapple test weight in accordance with sfirveillance Procedure DOS 800-1 steps j-1. The internal grapple. friction loads are apparently changed slightly under conditions different from DOS 800-1. If inrproper hoist loaded light operation is observed under certain operating conditions different than DOS 800-1 condifions, it will be necessary to reset the load cell for the actual conditions to obtain proper operation.

Corrective Action: .. The fuel grapple load cell was reset to actuate the hoist loacl.ed light lifting a fuel assembly in the reactor core. Corrective Action to Prevent Recurrence:

Procedure DI"P 800-7 "Fuel Handling' Inside the F.eactor" step F.*1.1, DFP 800-8 Control Rod Blade Guide Movements Between and in the Spent .Fuel Storage Pool and the Reactor" step F.6.j, and DFP 800-10 "Fuel Eovements from the Reactor to the Storage Pool" step F.l.h i;vill be revised. These revisions

'dill allO\*J verification that the :Cuel assembly is moving up as the grapple is raised by visual observation of the :fuel assembly or by servation of the. hoist loaded light. An note will be added to these 9rocedure steps to point out the relationship of the hoist loaded light sensitivity to grapple position.

These procedures will be. revised prior to next refueling activities on Dresden Units 2 or 3. l l