ML20033D826
| ML20033D826 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 02/17/1984 |
| From: | Johnston W Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML082410577 | List: |
| References | |
| FOIA-92-463 NUDOCS 8403010179 | |
| Download: ML20033D826 (4) | |
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vl FEB 17 19EL1
,e Docket Nos:
50-352/353 MEH3RANDUM FOR: Thomas M. Novak, Assistant Director for Licensing Division of Licensing FROM:
Villiam V. Johnston, Assistant Director Materials, Chealcal & Environmental Technology Division of Engineering
SUBJECT:
INTERIM EVALUATION OF ACTIONS TO MITIGATE INTERGRANULAR 4
STRCSS CORRCSICH OF 5TAINiESS STEEL PIPING SYSTEMS AT LIMERICK, UNITS 1 ARD 2 Plant Name:
Philadelphia Electric Co., Limerick Generating Station, Units 1 and 2 Supplier: General Electric /Bechtel Docket Hu:tbers:
50-352/353 Reviewer: D. E. Smith Responsible Branch and Project Manager:
LBf2, R. Martin Description of Task:
Supplemental Safety Evaluation Report Your cesorandum of February 6,1984 requested that the Materials Engineering Br:nch, Di.f:f c.. cf Er.gir.strir.g, review the applicant's response of January 18, 1934 to your letter of November 14, 1983.
The letter of November 14th forwarded the Advisory Consittee On Reactor Safeguards' (ACRS) Interia Report on Limerick Station, which requested that the applicant develop and saintain a careful surveillance program to identify any factors encountered during plant operation which have the
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Ve have reviewed the applicant's response of January 18, 1984. We conclude I
that the applicant has met regulatory requirements and has adequate sur-veillance programs. The applicant is evaluating and monitoring several experimental programs for potential application to Limerick Station.
The applicant indicates that they will implement the programs when they believe that the programs are appropriate for their plant (s).
Our Supplemental Safety Evaluation Report is attached.
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William V. Johnston, Assistant Director Matefals, Chemical & Environmental Technology Division of Engineering
Attachment:
As stated cc:
See Page 2 Contatti D. Smith 6
X-24553 1
8403010179 840217 CF ADOCK 05000352 W
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o-s Thomas M Novak FEB 17 1984 r
cc:
A. Schwencer W. Johnston
- 5. Pawlicki R. E. Martin B. D. Liaw W. Hazelton R. Klecker C. Y. Cheng C. D. Sellers H. iita G. Johnson i
D. E. Salth B. Turovlin V. Benaroya i
I DISTRIBUTION:
DMB - Docket Files i
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e PHILADELPHIA ELECTRIC COMPANY LIKERICK GENERATING SATAION, UNITS 1 AND 2 DOCKET NUMBERS 50-352/353 MATERIALS ENGINEERING BRANCH HATERIALS APPLICATION SECTION SUPPLEMENTAL SATETY EVALUATION REPORT The staff has reviewed the applicant's actions to sitigate intergranular stress corrosion cracking (IGSCC) of weld joints in stainless steel piping systems in our previous input to Section 5 of the SER. All weld joints of the primary coolant system stainless steel piping have been attigated.
For the other systems, the applicant has taken action to sitigate IGSCC in almost all weld joints, ar,d has committed to take additional altigating actions or augmented inservice inspection of those welds which have not been aitigated.
The applicant's surveillance progran consists of: (a) regular monitoring of primary coolant chemistry to maintain conductivity and chlorides within Technical 5pecification Limits, (b) adding advanced analytical capabil-ities to monitor trace elements which are believed to have an effect on IGSCC, and (c) augmented inservice inspection of welds which have not been uitigated and are capable of being inspected.
The applicant is also moni-toring experimental activities of the Electric Power Research Institute, General Electric Co., and others concerning the effects of water chemistry on pressure boundary saterials.
The results of these studies will be reviewed for appitcation to Limerick, and incorporated if appropriate.
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l The staff is preparing Revision 2 to NUREG-0313, " Technical Report on j
Material Selection and Processing Guidelines for BVR Coolant Pressure
,l Boundary Piping." It will address the staff's technical positions on raterial selection and processing for prevention of IGSCC in stainless f
pipir.; systt;s and en insp&tivni fur thva systems which do not confors j
f to the technical positions on materials selection and processing.
The staff anticipates that HUREG-0313, Revision 2, will be implemented uniformly l
i on all BVR plants within one year. At that time, the Limerick plants and all other BVRs which have not been reviewed in detail will be evaluated.
The Limerick plants confors to the staff's technical positions in the preposed Revision 2 of H" REG-0313 on =aterials selection and processing
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i to a greater extent than most operating BVRs. The Limerick plants have had little or no time at elevated temperatures, and accordingly, IGSCC bu not occurred and is not anticipated to occur until at least the second refueling outage.
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Ve recomend that timerick Unit I be allowed to proceed with normal start-up i
i operations. Unit 2 will be addressed when Revision 2 to NUREG-0313 is l
implemented, which will be well before the unit's start-up.
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