ML20040E187
| ML20040E187 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 01/27/1982 |
| From: | Leddick R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | NRC |
| References | |
| GO3-82-090, GO3-82-90, NUDOCS 8202030244 | |
| Download: ML20040E187 (1) | |
Text
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Washington Public Power Supply System Box 1223 Elma, Washington 98541 (206)482-4428 T' t '
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i Docket Numbers 50-508 and 50-509 d
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January 27, 1982 f
G03-82-090
< /77 Document Control Desk U. S. Nuclear Regulatory Commission Washington D. C.
20555
Subject:
PROJECT NOS. 3 AND 5 FINAL REPORT OF POTENTIAL 10CFR50.55(e)
SOUTH STEAM GENERATOR BEARING PLATES, UNIT 3 (D/N #038)
Attached is a copy of the final report provided to Region V concern-ing a potential 10CFR50.55(e) associated with the South Steam Gener-ator Bearing Plates.
Should you have any questions or desire further information, please contact me directly.
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R.
. Le dick (1000)
Program Director, WNP-3/5 DRC/tt Attachment cc:
J. Adams - NESCO-WO/A D. Smithpeter - BPA-WO/A Ebasco - New York-WO/A
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WNP-3/5 Files - Richland-WO/A I(
j 8202030244 820127 lgDRADOCK0500050s PDR
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3-COMMTIMENT CONTROL-WO/A WPPSS CCHREsPONDENcE NO._
ROUTING-WO/A SITE FILES-WO/A lWG ALBERT /NRC-W/A' DR C00DY-W/A 2
lDE DOBSON-WO/A E
lJJ DORAN-WO/A RB GLASSCOCK/280-W/A t.
Numbers 50-508 and 50-509 j
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RG PECK-W/A
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JP SLUKA-W/A IJanuary 22, 1982 eg-OE. TRAPP-WO/ A' G03-82-068 JE WERLE-WO/A
- 'M GC SORENSEN/440-W/A
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U. S. Nuclear Regulatory Commission, Region V "it g'
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m Office of Inspection and Enforcement 1450 Maria Lane, Suite 260 E
I Walnut Creek, California 94596-5368
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Attention:
Mr. B. H. Faulkenberry
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Brge g
Chief, Reactor Construction r
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Subject:
PROJECT NOS. 3 AND R s
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DOCKET NUMBERS 50-E 8 "N 50-5 g y w %
FINAL REPORT OF P0iEi'I,'
sCFR:
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SOUTH STEAM GENERA: R CA IL PLATES, UNIT 3 (D/N #038)
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In accordar.ce with the brevisions of yCFR50.55(e), Region V was noti-
,e fied on Octo
- 9. 1981 that a potential deficiency, concerning the
- y%j subject co i ' n, was found.
4 Attached is Sur y System approved final report that provides a de-2 iency, an analysis of the safety implications tion of D e 1
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'rrective eti s taken. Based on'this evaluat' ion, it is con-si re that the eficiency would adversely affect the safe operations
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of t nd, therefore, is reportable as required by 10CFR50.55(e).
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5 nuld have any questions or desire further information, please gt or, act me directly.
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Br 8
R. S. Le ick (1000)
.e Program Director, WNP-3/5 i
DRC/tt j[
Attachcent
!E ri; cc:
J. Adams - NESCO-WO/A D. Smithpeter - BPA-WO/A
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Ebasco - New york-WO/A WNP-3/5 Files - Richland-UO/A
ATTACHMENT I (D/N #038)
SOUTH STEAM GENERATOR BEARING PLATES, UNIT 3 INTRODUCTION he bottom by a sliding base bolted The NSSS sten, generators are supported at tThe sliding base rests o
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l skirt.
d thermal expansion of the to an integrally attached conica low friction bearings which allow unrestraine f the These bearings slide on smooth surfac'es o th The design surface finish required for this smooD g;
four (4) bearing plates.
(MU).
sliding operation is 125 microinches function is 1 ".
steam generator between cold and hot MU surface (CB&I) provided the bearing plates with a 125hickness Due to installation tolerances, the plate tJoint Venture (MK-ES Chicago Bridge and Iron these plates to finish.
d Oregon.
to adjust for the gap.
d thickness but did not attain the Bingham Willamette machine shop in Portlan,
ih Bingham Willamette excluded the surface fin sT machined these plates to the require 125 MU su.rface finish.
plates in the as-received condition.
in their Certificate of Compliance.
during receiving inspection h
accepted and subsequently installed t e finish was not provided Personnel who performed the document reviewfailed t f
by Bingham-Willamette.
installed on the south side Bearing plates and Steam Generator No. 2 were 21-22, 1981.
weekend of August 3 during the Venture an NCR was initiatcd by 'oint of Unit No.
deficiencies relative to the bearing plate One week after Cencrator placement, to identify the documentationThe NCR noted that surface finish.
the determination indeterminate.
f Primary Coolant System,was considered si Since this could af fect the performance o d the problem of surface finish was essential an81 in accordance with the provisions d
17, 1981 was issue.
The NRC was notified on September 20,19t dated November of 10CFR50.55(e) and an Interim Repor I
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_ DESCRIPTION OF DEFICIEN for Steam Generator #2 in Unit 3, the actual surface finish A.
plates as installed was indeterminate.lity of the actual finish through proper to clearly establish the acceptabi After the installation of the iving inspection of documentation prior to installation. steam generator, it was d t
the pistes was questionable and the ac u were indeterminate.
E The'~ deficiencies are categorized as follows:
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, 1) Material Deficiency.
- 2) Inspection Deficiency M_aterial Deficiency:
h top and bottom Ebasco design drawing required a 125 MU finish at t eCB&I provided t to renachine the plates surfaces of these bearing plates.
required finish; however, it was necessary Bingham Willamette, the field conditions. machined the plates to the to adjust the thickness to suit finish was not achieved.
under purchase order from Joint Venture, required thickness, but the 125 MU surfaceVenture's Aud finish varied Joint from 100 MU to 650 MU.
Inspection Deficiency:
certified t
In the Certificate of Compliance, Bingham Willamet e A Joint finish requirements.
the plates but excluded the surface i ted out in Venture auditor, who audited the shop documents, po n from 200 MU to his audit report that the surface finish varied 6 h required by the purchase order.
face finish on The Joint Venture was aware of the questionable surWillamette and w these plates as shipped from Binghamrework the plat However, the ry.
l comparative Joint Venture receiving inspector, using surface p ateived to be in c methods, J.udged the surface finish as reced the bearing plates were with the purchase order requirements anrework at the site.
the Bingham The Joint released and installed without hat Venture's R(ceiving Inspection Report indicates tfied and accepted.
- However, Willamette Certificate of Compliance was veri ha i h requirement Bingham Willamette's exception to surface fin sddressed in the Rece the Certificate of Compliance was not a l
Inspection Report. l 1
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i B.
. SAFETY ANAL.YSIS The steam generator is connected to Prieary and Secondary Coolant Loop piping.
These piping systens are designed for a' fixed rdte of temperature and pressure changes during heat up and cool down cycles.
Temperature change.and pressure limits are established to assure consistency with the design number of cycles and satisfy applicable stress ' limits ir the components of the Coolant System.
Interface temperatures vary at the primary and seconda'ry system sides.
The thermal expansion of the individual components is designed to be related to 1 " thermal expansion of the Primary Coolant System during hot function.
Hence, to accommodate this thermal expansion the sliding surface for the steam generator is very important.
Frictional resistance of the bearing plate is important to the sliding
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motion of the Steam Generator. The coefficient of friction, between the bearing plates and the sliding base bearings considered in the CE design of the system is based on a 125 MU surface finish of the bearing plate's.
If a rougher surface finish is provided, then the coefficient of friction will increase.
This will increase the frictronal resistance to the sliding motion of the steam generator, thereby inhibiting the system from attaining
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the design intend,ed thermal expans' ion and this, in turn, will induce additional stresses in both primary and secondary coolant system components.
This could adversely affect the design integrity of the entire system and could also adversely affect the safe operation of the plant.
Since the Combustion Engineering (CE) analysis for steam generator sliding is based on a 125 MU finish, any adverse af fects due to varying rougher finish on the sliding surface are indeterminate.-
C.
CORRECTIVE ACTIONS
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The following actions were taken-to correct the deficiency:
1.
Steam Generator #2 was lifted and the four questionable bearing plates were replaced with four new bearing plates having 125 MU surface finish in accordance with design requirements.
The four removed bearing plates were inspected by Pacific Testing Lab' oratory of Sea t tle, Washington. Two plates were found to rret 125 HU surf.5cc f I n t r.h.
Third one varied from 86.5 HU to 245 HU.
Fourth one varied f rem 152.5 to 418.5 HU.
2.
Joint Venture revised their Receiving Inspection Procedure to include the verification of all related documentation at the time of receiving inspection..
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