ML19340B009
| ML19340B009 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion  |
| Issue date: | 08/06/1973 |
| From: | Brian Lee COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19340B007 | List: |
| References | |
| NUDOCS 8010170716 | |
| Download: ML19340B009 (4) | |
Text
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Accress Reply to: Post Othee Box 767 Chicago, Ilknois 60690 August 6, 1973 Mr. Boyce H. Grier Regional Director Directorate of Regulatory Operations - Region III U.S. Atomic Energy Ccmmission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Inspection of Bergen-Patterson Shock Suppressors and Restraints at the Dresden, Quad-Cities and Zion Nuclear Generating Stations, AEC Dkts 50-10, 50-237, 50-249, 50-254, 50-265, 50-295 and 50-304
Dear Mr. Grier:
On July 27, 1973, you requested that Commonwealth Edison conduct immediate inspections of all Bergen-Patterson shock suppressors and restraints (" snubbers") in use at our nuclear generating stations.
This letter is to inform you of the status of those inspections.
It has been determined that no Bergen-Patterson " snubbers" are in use at Dresden Unit 1.
Of the total of seven (7) " snubbers" furnished by others, five have been inspected and found operable.
The 2 other " snubbers" on this unit will Pa inspected during the refueling outage scheduled to begin in m'l-Septembe, 1973.
Zion Unit 1 has sixteen Bergen-Patterson " snubbers" and over one thousand others made by Grinnel.
All " snubbers" at Zion 1 were checked during hot functional testing early this year.
All sixteen Bergen-Patterson " snubbers" were re-inspected on July 27, 1973, and found to be satisfactory in all respects.
It is planned to complete this inspection before proceeding above 50% power.
Quad-cities Unit 2 was shut down on July 28, 1973 to inspect " snubbers" in the drywell.
Of the 29 Bergen-Patterson units in use a total of 19 are considered to be inoperable due to loss of fluid.
The attached list details those failures.
Sixteen (16) " snubbers" on Unit 2 were made by others.
One of the 16 was found inoperable due to a loose tubing connection and loss of fluid.
so1ono 7/6
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J Unit System Number Failed Size (Stroke x Bore)
Dresden 2 HPCI 5
6" x 2-1/2" LPCI 2
6" x 2-1/2" i
6" x 2-1/2" feed water 3
6" x 2-1/2" cleanup 3
6 " x 2-1/2" recirculation 9
6" x 4" 2
6" x 3-1/4" 2
6" x 2-1/2" Dresden 3 HPCI 5
6" x 2-1/2" LPCI 2
6" x 2-1/2" 2
6" x 2-1/2" core spray cleanup 3
6" x 2-1/2" feedwater 3
6" x 2-1/2" recirculation 11 6" x 4" 1
6" x 3-1/4" 2
6" x 2-1/2" Quad-Cities 2 core spray 4
6" x 2-1/2" RHR 5
6" x 2-1/2" recirculation 1
6" x 5" 5
6" x 4" 4
6" x 2-1/2" Quad-Cities 1 core spray 4
6" x 2-1/2" RHR 6
6" x 2-1/2" Recirculation 5
6" x 2-1/2" 8
6" x 4" 1
6" x 5"
Conunonwealth Edison Company s
s Mr. Boyce H. Grier August 6, 1973 On August 1, 1973 Unit 1 at Quad-Cities was removed from service for inspection of the 29 Bergen-Patterson " snubbers".
A total of 24 were found to be inoperable due to loss of fluid.
Those failures are also detailed on the attached list.
Inspection of the 18 other " snubbers" revealed two which were inoperable.
Neither failure was attributed to seal problems.
One had a broken oil line and the other had a loose connection.
Dresden Unit 3 was taken off our system on July 31, 1973 for inspection.
Of the 43 Bergen-Patterson " snubbers" on that unit 29 are inoperable due to loss of hydraulic fluid.
The locations of those units are included on the attached list.
One of the eleven other " snubbers" was inoperable due to low fluid level in accumulator.
It was attached to the turbina bypass line to the condenser.
The inspection outage on Dresden Unit 2 began on August 2, 1973.
A total of 28 out of the 43 Bergen-Patterson
" snubbers" have been found to be inoperable due to loss of fluid.
The ' attached list gives the specifics.
Two of the eleven other " snubbers" were inoperable.
They were also attached to I
the turbine bypass line to the condenser.
The defective " snubbers" identified during these inspections will be repaired prior to resumption of operation.
The first time that Dresden 2 and 3 and Quad-cities 1 and 2 are shut down following one month's operation, the drywells will be de-inerted and the Bergen-Patterson " snubbers" inspected.
A program of more frequent surveillance on the Bergen-Patterson
" snubbers" located outside the drywell at Dresden will be implemented.
Very truly yours, V}C9d 9*
Byran Lee, Jr.
Vice-Presidentd
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