ML20062N561
| ML20062N561 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/10/1982 |
| From: | Haynes J SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-SSINS-6820 IEB-82-02, IEB-82-2, NUDOCS 8208230249 | |
| Download: ML20062N561 (6) | |
Text
Docket Nos. 50-361/362 Bulletin Reply 82-02 Soutitern California Edison Company 5
P O. BOX 800 2 2 44 W ALN UT GROVE AVENUE ROSE ME AD C ALIFORNI A 91770 J. G. H AY N E S Tet ewo~.
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V. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Attention: Mr. R. H. Engelken, Administrator
Subject:
Docket No. 50-361 and 50-362 San Onofre Nuclear Generating Station Units 2 and 3 Enclosed as requested in IE Bulletin No. 82-02: Degradation of Threaded Fasteners in the Reactor Coolant Pressure Boundary of PWR Plants, is our response to Action Item Nos. 3 and 5 for San Onofre Units 2 and 3.
Action Item No. 5 is to provide a written report under oath or affirmation of the specific information requested by Action Item No. 3 for threaded fasteners at San Onofre Units 2&3.
Responses to the remaining action items in IE Bulletin No. 82-02 will be provided on the following schedule:
Action Item Completion Date 1.
Develop and Implement Maintenance When needed or September 15, Procedures for Threaded Fastener 1982 whichever. occurs first.
Practices 2.
Remove, Clean and Inspect Threaded Program Implementation by Fasteners per ASME Code Section XI January 30, 1983 and (1974 or later) IWA-2210 and 2220.
inspection no later tilan the completion of the next refueling outage.
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Mr. R. H. Engelken August 10, 1982 4.
Report of Inspection per Action Item Within 60 days following No. 2 above.
completion of outage during which Action Item No. 2 was performed.
Subscribed on this
/d day of / < c,m h,1982.
v Very truly yours, By i k-
., nir A J. G. Haynes /
l Manager of Nuclear Operations Subscribed and sworryto before me dayof/Nya/
, 1982 this /oM
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ts/ bus Notapy Public in and for the County of L6s Angeles, State of California Enclosure
~ ~ ~ '~ ~ ~ N E 1 i AGNES CRABTREE I I
cc: Director, Office of Inspection "N,.Ycor f,2 7 ll l
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and Enforcement, NRC ms wetts coum A. E. Chaffee, USNRC
.. _ _ _ _ _ _ Fmmmson Exo. As 27,1982; M
Site Inspeetor, 5023
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ACTION ITEM NO. 5 REPORT OF INFORMATION REQUESTED IN i
ACTION ITEM NO. 3 IE BULLETIN NO. 82-02 DEGRADATION OF THREADED FASTENERS IN THE REACTOR COOLANT PRESSURE BOUNDARY OF PWR PLANTS San Onofre Nuclear Generating Station Units 283.
August. 10. 1982
. A. -
ACTION ITEM N0. 3 IE BULLETIN N0. 82-02 DEGRADATION Of THREADED FASTENERS IN THE REACTOR COOLANT PRESSURE B0UNDARY OF PWR PLANTS SCOPE The scope of the action item below is limited to the RCPB.
Included are the threaded fasteners (studs or bolts) in (1) steam generator and pressurizer manway closures, (2) valve bonnets, and pump flange connections installed on lines having a nominal diameter of 6 inches or greater and (3) control rod drive (CRD) flange and pressurizer heater connections that do not have seal welds to provide leak-tight integrity. That is, CRDs having an omega seal weld design are excluded from this bulletin action. The reactor vessel head closure studs are also excluded for those PWR licensees committed to the provisions of Regulatory Guide 1.65, " Materials and Inspection for Reactor Vessel Closure Studs."
ACTION ITEM NO. 3 Provide the following information for closures and connections within the scope of this bulletin:
a.
Identify those bolted closures of the RCPB that have experienced leakage, particularly those locations where leakage occurred during the most recent plant operating cycle. Describe the inspections made and corrective measures taken to eliminate the problem.- If the leakage was attributed to gasket failure or its design, so indicate.
b.
Identify those closures and connections, if any, where fastener lubricants and injection sealant materials have been or are being used and report on plant experience with their application particularly any instances of SCC of fasteners.
Include types and composition of materials used.
RESPONSE
San Onofre Units 2&3 are now in startup with the first operating cycle for Unit 2 scheduled to begin in the last quarter of 1982 and the first operating cycle for Unit 3 scheduled to begin approximately one year later, a.
Steam generator and pressurizer manway closures and control rod drive flange and pressurizer heater connections have not experienced leakage.
The only valve connets or pump flange connections installed on-lines having a nominal diameter of 6 inches or greater that have experienced leakage are Archor Darling valve bonnet leaks in lines up to'12 inches'in diameter. The Anchor Darling valve bonnet leaks detected by visual inspection appeared to be generic and were corrected by having the vendor representative assist maintenance personnel in the' installation of the bonnet seal ring. The maintenance procedure for the installation of the seal ring now reflects the vendor representatives information.
No corrosion as described in the Bulletin 82-02 was noted.
. b.
No injection sealant materials have been used to date on the RCPB bolted closures.
The thread lubricants used are only those listed in CEND 353,
" Field Handling, Maintenance and Storage Requirements for Combustion Engineering Furnished Equipment," Rev. 5, August 1976, Tables 5-3 and 5-4 (Attachment I).
These are standard industry lubricants, and their composition is available from Combustion-Engineering.
To date, no stress corrosion cracking has been identified on any of the RCPB bolted closures.
The short term operating experience does not lend itself to any meaningful evaluation of the lubricants currently in use.
TDM:5089
ATTACHMENT I LUBRICANTS USED ON THREADED FASTENERS SAN ONOFRE NUCLEAR GENERATING STATION UNITS 2 AND 3 These Tables 5-3 and 5-4 are from CEND 353, " Field Handling, Maintenance and Storage Requirements for Combustion Engineering Furnished Equipment," Rev. 5, August 1976.
i Table 5-3 Unrestricted Lubricants l
The following lubricants are acceptable for use in the primary and secondary systems.
a.
Dag Dispersal 156 b.
Neolube c.
Never Seez Pure Nickel Special #165 d.
Dow Corning 41 (DC 41) e.
Down Corning 44 (DC 44) f.
Dow Corning 710 and Dow Corning 710 G (DC 710 and DC 710 G) g.
Dag Dispersal 154 Table 5-4 Restricted Lubricants The following lubricants are acceptable for use on items which will not come in contact with primary coolant.
a.
All of those listed in Table 5.3 b.
. Super-Moly c.
- Se rmetal - 94 d.
Sermetal W e.
Molykote 6 f.
Molykote U g.
Everlube 620 h.
Molykote Z i.
Electrofilm 66c l
j.
Electrofilm 2006 k.
Castor Oil - USP Grade 1.
Johnson's Wax Lubricant #121 m.
Vaseline n.
Molykote.505 o.
Sermetal 27 p.
Dow Corning 55M q.
Everlube 629 5100 4
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