ML19340B008
| ML19340B008 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion  |
| Issue date: | 08/27/1973 |
| From: | Brian Lee COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19340B007 | List: |
| References | |
| NUDOCS 8010170712 | |
| Download: ML19340B008 (4) | |
Text
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- 7 One First National Plaza. Chicago. tilinois Address Reply to: Post Office Box 767 Chicago. Ithnois 60690 August 27, 1973 Mr. Boyce H. Grier Regional Director Directorate of Regulatory Operations - Region III U.S. Atomic Energy Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Updated Report on Inspection of Bergen-Patterson Shock Suppressors and Fastraints at the Dresden, Quad-Cities and Zion Nuclear l
Generating Stacions, AEC Dkts 50-10, 50-237, 50-249, 50-254, 50-295 and 50-304
Dear Mr. Grier:
On July 27, 1973, you requested inspection of Bergen-Patterson shock suppressors and restraints in use at Commonwealth Edison's nuclear generating stations.
My letter of August 6, 1973 summarized the results of the inspections as of that date.
This letter revises and expands the data contained in the August 6 let-ter based upon more detailed examination of the " snubbers".
Minor errors in the previous tabulation are also corrected.
There are no Bergen-Patterson " snubbers" in use at Dresden Unit 1.
Of the total of seven (7) " snubbers" furnished by others, five have been inspected and found to be operable.
The other two will be inspected during the refueling outage scheduled to begin in mid-September, 1973.
Dresden Units 2 and 3 each utilize forty-three (43)
Bergen-Patterson " snubbers" on safety-related systems.
A total of twenty-eight (28) on Unit 2 and twenty-nine (29) on Unit 3 were found to be inoperable due to loss of fluid resulting from seal failures.
The inoperable units were all located inside the drywell.
To avoid releasing more oil in the drywell and to expedite repairs the units were rebuilt without determining specifically which seals on each unit were failed.
801oire 7/g AUG 3 01973
y Commonwealth Edison Company Mr. Boyce H. Grier August 27, 1973 The previous report listed eleven " snubbers" on each unit which were not manufactured by Bergen-Patterson.
It has been determined that eight out of the eleven are not installed on safety-related systems.
Of the remaining three per unit, none were found to be inoperable.
There are twenty-nine (29) Bergen-Patterson " snubbers" on each of the two Quad-cities units.
It has been determined that twenty-five (25) of those on Unit 1 and twenty (20) on Unit 2 were inoperable as a result of seal failures.
All the
" snubbers" are tabulated in the attachment to this letter.
Specific seal failures on each " snubber
- were not identified.
Unit 1 safety-related systems utilize eighteen (18) " snubbers" made by other manufacturers.
Two wer,e inoperable but neither failure was related to seal deterioration.
A Grinnel model G5x5 (bore x stroke), serial No. 4451, on the main steam piping outside the containment had a broken oil line with resultant fluid loss.
A Grinnel model G 3-3/4 x 5, serial No. 4443, outside the containment on the feedwater piping had a loose connection and had lost its oil.
Unit 2 has twenty (20) non-Bergen-Patterson " snubbers" including four (4) which were not included in the previous report.
All except one were found to be operable.
A Grinnel model G 5 x 5, serial No. 4694, on the main steam piping outside the containment had a loose tubing connection with resultinc, oil loss.
It has been determined that the safety-related systems on Zion Unit 1 contain sixteen (16) Bergen-Patterson " snubbers" and a total of 503 others.
All were checked during hot functional testing early this year.
The Bergen-Patterson units were reinspected on July 27, 1973 and found to be satisfactory in all respects.
Of the 503 others, all but.136 have been inspected and found to be operable.
It is planned to complete the inspection of the others before proceeding abo"e 50% power.
Defective " snubbers" identified during these inspections were repaired prior to resumption of operation.
Very truly yours, 6]1 r
i' Byr n Lee, Jr. /
Vice President,
j i
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s DRESDEN PA8tED DE*RGEN-PAMERSOh! "SNUDDERS" DRESDEN 2 Sire System Stroke x Bore Model No.
Serial No.
~
6" x 2-1/2" HSSA-lO 487511 6" x 2-1/2" HSSA-10 487556 6* x 2-1/2" HSSA-10 487560 6" x 2-1/2" HSSA-10 487508 6* x 2-1/2" HSSA-10 487541 LPCI 6" x 2-1/2" HSSA-10 487567 6" x 2-1/2" HSSA-10 487533 Core Spray 6* x 2-1/2" HSSA-lO 487500 6" x 2-1/2*
HSSA-10 487539 Feedwater 6" x 2-1/2" HSSA-10 487570 6" x 2-1/2" HSSA-10 487553 6" x 2-1/2" HSSA-10 487575 Cleanup 6* x 2-1/2" HSSA-10 487572 6" x 2-1/2" HSSA-10 487544 6" x 2-1/2" HSSA-10 487545 Recirculation 6" x 4" HSSA-30 487769 6" x 4" HSSA-30 487776
+
6" x 4" HSSA-30 487759 6" x 4" HSSA-30 487781 6" x 4" HSSA-30 488788 6" x 4" HSSA-30 487757 6" x 4" HSSA-30 487762 6" x 4" HSSA-30 487814 i
6" x 4" HSSA-30 487756 i
6" x 3-1/4" HSSA-20 487616 l
~
6" x 3-1/4" HSSA-20 487617 6" x 2-1/2" HSSA-10 482597 I
6" x 2-1/2" HSSA-10 482596 l
i l
DRESDEN 3 HPCI 6" x 2-1/2" HSSA-10 51035 r
6" x 2-1/'"
HSSA-10 51035 6* x 2-1/2" HSSA-10 51035 6" x 2-1/2" HSSA-10 51035 6" x 2-1/2" HSSA-10 F51035 LPCI 6" x 2-1/2" HSSA-10 51035 6" x 2-1/2" HSSA-10 F51035 Core Spray 6" x 2-1/2" HSSA-10 51035 6" x 2-1/2" HSSA-10 51035 Cleanup 6" x 2-1/2" HSSA-lO F51035 6" x 2-1/2" HSSA-10 F51035 6* x 2-1/2" HSSA-10 F51035
's Feedwater 6" x 2-1/2" HSSA-10 51035 6" x 2-1/2" HSSA-10 F51035 6" x 2-1/2" HSSA-10 F51035 Recirculation 6" x 4" HSSA Missing 6" x 4" HSSA-30 Illegible 6" x 4" HSSA-30 487785 6" x 4" HSSA-30 42781 6" x 4" HSSA-30 487784
)
6" x 4*
HSSA-30 487767 l
6" x 4" HSSA-30 487771 6" x 4" HSSA-30 487800 6" x 4"-
HSSA-30 487783 6" x 4" HSSA-30 487819 6" x 4*
HSSA-30 487789 6" x 3-1/4" HSSA-20 487631 6" x 2-1/2" HSSA-10 482595 6" x 2-1/2" HSSA-10 482603
s QUAD-CITIES FAIT.ED BERCEN-PATTERSON "SNUDDPRS"
~~
,Page 2 OUAD-CITIES 1 Size System Stroke x Bore Model No.
Serial No.
Core Spray 6" x 2-1/2" HSSA-lO F-61284-1 6" x.2-1/2" HSSA-10 61284-1 6". x 2-1/2" HSSA-10 Missing 6" x.2-1/2" HSSA-10 F-61284 RHR 6",x 2-1/2" HSSA-lO 61284-1 6" x 2-1/2" HSSA-10 F-61284-1 6" x 2-1/2" HSSA-lO Missing 6" x 2-1/2" HSSA-10 F-61284-1 6* x 2-1/2" HSSA-10 F-61284-1 6". x 3-1/4" HSSA-20 F-51035 s.
Recirculation 6* x 2-1/2" HSSA-10 482594 6" x 2-1/2*
HSSA-10 482604 6*. x 2-1/2*
HSSA-10 482580
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6* x 2-1/2" HSSA-10 482605 6" x 2-1/2" HSSA-lO 482559 6". x 4*
HSSA-30 487792
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6" x 4" HSSA-30 487761 6*. x 4" HSSA-30 48780-9 a
6".x 4*
HSSA-30 87775 6" x'4*
HSSA-30 487820 6". x'4".
HSSA-30 487780 6"..x 4" HSSA-30 487760 6" x 4" HSSA-30 487774 65 x '5" HSSA-50 68290 6 "_ x, 5 ";,
HSSA-50 68290 y:
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r QdAD-CITIES 2
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Core Spray 6" x 2-1/2" HSSA-10 F62955-2 6* x 2-1/2" HSSA-10 F62955-2 6" x 2-1/2" HSSA-lO F62955-2 6". x,2-1/2" HSSA-10 F62955-2 RHR' 6*,.x,2-1/2" HSSA-10 F-6128-1 6",.x ; 2-1/2" HSSA-lO F.6128 '.
67,x12-1/2" HSSA-10 F-6128-1 6*,.x*2-1/2" HSSA-lO F-6128-1
,... /.
6".. x, 2-1/2" HSSA-10 6128411
' Recirculation 6",,x 5" HSSA-50 68290 HSSA-30 487722 6",x 4" 6" x"4* '
HSSA-30 487801 6",x'4" HSSA-30 487773 HSSA-30 487811 6 ".. x 4
- 6" x 4*
HSSA-30 487796 6" x 2-1/2" HSSA-10 482590
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6",x'2-1/2*
HSSA-10 F-61284-1 6" x 2-1/2" HSSA-10 F-61284-1
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