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{{#Wiki_filter:.} '. ... ,,_ . :\ 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 \   
{{#Wiki_filter:.} '. ... ,,_ . :\ Mr. James G. Keppler,  
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
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
}}
}}

Revision as of 13:15, 29 June 2018

Letter Regarding Response to the Item Noted Under Enforcement Action in Inspection Report 05000249/1976020 - Dresden Unit 3
ML17252B138
Person / Time
Site: Dresden Constellation icon.png
Issue date: 11/08/1976
From: Bolger R L
Commonwealth Edison Co
To: Keppler J G
NRC/RGN-III
References
IR 1976020
Download: ML17252B138 (2)
v • d • e


See also: IR 05000249/1976020

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

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