ML20003D264
| ML20003D264 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 03/13/1981 |
| From: | Widner W GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-81-01, IEB-81-1, NUDOCS 8103260100 | |
| Download: ML20003D264 (5) | |
Text
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e iY Gs.xjia Power W. A. Widne, 3 ;~ s e aaa m w m March 13,1981 sc ea. ce ea.,
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United States Nuclear Regulatory Compq/
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Office of Inspection and Enforcemen Region II - Suite 2l00
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Mr. James P. O'Reilly
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Gentlemen:
g Georgia Power Company hereby submits the following in'ormation in response to your letter, dated ou "ary 27, 1981, concerning ISE Bulletin 81-01, " Surveillance of Mechanical snubbers." The same item numbering is used herein, l.
Upon issuanca of I&E Bulletin 81-01 on January 27, 1981, a review of the requirements and the various snubbers installed at Edwin I.
L'ch Nuclear Plant, Units 1 and 2, was conducted.
Unit 1 was found to have two (2) accessible snubbers manufactured by International Nuclear Safeguards Corporation (INC) installed on safety-related systems.
Because of problems identified during May, 1980, Design Change Request (DCR) 80-15 had been issued to replace the INC snubbers with Pacific Scientific Company snubbers. The replacement had been planned for the refueling outage scheduled to start February 27, 1981.
The.mmediate action required for Unit 1 was to inspect the two (2) ac.essible INC snubbers.
Due to the fact that Pacific Scientific snubbers and hardware were already available to replace the subject accessible INC snubbers, the accessible INC snubbers were replaced on February 26,1981, in accordance with Maintenance Requests 1-81-1209 and 1-81-1210 and procedure HNP-1-10948, " Installation of Pacific Scientific Snubbers."
When the subject I&E Bulletin was received, replacement of the Unit 2 INC snubbers (accessible and inaccessible) with Pacific Scientific snubbers was in progress as the unit was down for maintenance and refueling.
Replacement of the INC snubbers was completed by February 22, 1981.
There are not any INC snubbers in stock at the present time nor are there any plans to stock them in the future due to change-over to Pacific Scientific snubbers.
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GeorgiaPower A Mr. James P. O'Reilly March 13,1981 Page 2 2.
Forty (40) inaccessible INC snubbers were identified as being installed on Unit 1 safety-related systems.
Those snubbers will be replaced with Pacific Scientific snubbers during the current maintenance / refueling outage.
Any inaccessible INC snubbers identified as being installed on Unit 2 safety-related systems were replaced with Pacific Scientific snubbers during the maintenance / refueling outage completed in February 1981.
3.
During the current maintenance / refueling outage on Unit 1, tne forty (40) inaccessible INC snubbers will be changed to Pacific Scientific snubbers.
Those new snubbers will be inspected and tested during installation as required by HNP-1-10948.
The Pacific Scientific snubbers previously installed on safety-related systems on Unit 1 will be inspected and tested per HNP-1-6804, " Inspection and Testing Pacific Scientific Mechanical Snubbers." The visual inspection and manual testing is scheduled for completion by May 15, 1981.
Upon completion of the testing, results will be reported to the NRC in accordance with the requirements of Item 4 of the bulletin within sixty (60) days after completion of the tests.
All Pacific Scientific mechanical snubbers installed on safety-related systems on Unit 2 have been visually inspected and manually tested prior to February 22, 1981.
Results of the testing is discussed in Attachment 1 to this letter and serves as the response for Unit 2 to Item 4 of the bulletin.
If you have any questions or comments in this regard, please contact this office.
W. A. Widner states that he is Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.
Georgia Power Company by:
W. A. Widner Swern to.and subscribed before me this 13th day of March 1981.
Nctary Puboc. Georgia. State at Large
-f 14 Commiss;cn Expres Sect 20,1953
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m-Notary Public JAE/mt b
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. Georgia t'ower A Mr. James P. O'Reilly March 13,1981 Page 3 Attachment xc:
M. Manry R. F. Rogers, III Director of the Office of Inspection and Enforcement
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ATTACHMENTL_1_
HATCH UNIT 2 PAC'FIC SCIENTIFIC SNUBBER TESTING All the safety-related system mechanical snubbers installed on Hatch Unit.2 were manufactured by the Pacific Scientific Company.
The visual ninspections and manual testing of two hundred ninety nine (299) cechanical snubbers were performed to the requirements of procedure HNP-2-6304,
" Inspection and. Testing Pacific Scientific Mechanical Snubbers " This action was completed on February 22, 1981.
The following is a tabulation of mechanical snubber model numbers and sizes which are installed on Unit 2 safety-related systems.
Model Number Size (Load in Ibs)
Guantity PSA-35 50000 23 PSA 10 15000 132 PSA 3 6000 73 PSA 1 1500 53 PSA l/4 350 18_
TOTAL 299
- As a result of the visual inspections and manual testing, three (3) mechanical snubters were identified as having fails'.
In accordance with the requirements of-Item 4 of I&E Bulletin 81-01, the defective snubbers are discussed as follows:
Failure No. 1 MPL No.:
2N37-TBP-R14A Manufacturer Name:
Pacific Scientific
'Model Number:
PSA 35
~ Size (Load in Ibs.):
50000 Serial Number:
558
. Mode of Failure:
Failure to. stroke in either compression or extension modes.
Cause of Failure:
Extensive corrosion / rust.
' Corrective Action:
Replaced snubber with -Serial Number 5330.
Disassembled adjacent snubber, ^"17-TBP-R14E Serial No. '549, PSA-35) and fo no corrosion /
4:
rust. Snubbers, serial nos. Sao and 549, to-o be returned to Pacific Scientific for evaluation of failure.
Snubber location:
. Isometric Dwg. 2N37-100.
Effect of failure on plant and. system
= safety:
None. Performed seismic analysis of the afffected piping; also, the welds were penetrant tested and no stress cracks were' located.
iJustification -
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~
Ifor1 con-
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' tinuing or resuming-4 Snubber w'
. eplaced prior to start-up of
' opera tion:
the unit.
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1
-.l Failure No. 2 MPL No. :
2E41 -HPCI-R50A Manufacturer Nace:
Pacific Scientific Model Number PSA 1 Size (Load in Ibs.):
1500 Serial Number:
1730 c
. Mode of Failure:
Displayed no indication of retention in either ccepressicn or extension acdes.
Cause of Failuri:
Unknown.
Corrective Ac'. ion:
Replaced snubber with Seria! Mumber 11923.
Disassembled snubber and found no rust cr evidence of physical damage. Snubber (Serial Mo.1730) to be returned to Pacific Scientific for evaluation of failure.
Snubber. location:
Isonetric Dwg. 2Eal-101.
Effect of failure on plant and system
. safety:
Mone.
Perforced seismic analysis of the affected piping; also, penetrant tested g
welds and no stress cracks were located.
Justification for con-
- tinuing or resuming.
operation:
Snubber was replaced cricr to start-up of the unit.
Failure No. 3 MPL No;;
2E41 tiPCI-R503 Manufacturer Name:
Pacific Scientific
.Model Nu=ber: -
PSA 1 Size (Load in lbs.):
1500 Serial. Number:
1792 Mode of' Failure:
Failed to stroke in either cc:pression or extensive mode.
Cause-of Failure:
Unknown.
Corrective ~ Action:
Replaced. snubber with Serial Number llE!9.
Disassembled snubber and found no rust or physical damage. -Snubber (serial no.
1792) to. be returned to Pacific Scientific for evaluation'of failure.
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-Snubber location:
' Isometric Dwg. 2E11-101.
Effect of failure on plant'and system
.sa e y:
'None.: Perforced seisnic analysis. of the ft affected piping; also, penetrant. tested welds and nr -*-ess. cracks were11ocated.
Justific& tion for con-
~ tinuing or resuming :
. opera tion:
Snubber was replaced prior to start-up of the unit. -
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