ML19309B250
| ML19309B250 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 03/20/1980 |
| From: | Hannon J Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19309B251 | List: |
| References | |
| NUDOCS 8004030332 | |
| Download: ML19309B250 (6) | |
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UNITED STATES E j 3,
i NUCLEAR REGULATORY COMMISSION 5
.C WASHINGTON, D. C. 20555 o
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MAROt 20200 o
Docket No.60-293 MEMORANDUM FOR:
T. A. Ippolito, Chief, ORB #3, D0R FROM:
J. N. Hannon, Project Manager, ORB #3, D0R
SUBJECT:
MEETING SUNiARY A meeting was held with representatives from BECo (the licensee) and GE in Bethesda, Maryland on March 13, 1980. The purpose of the meeting was to discuss BECo's plans to operate Pilgrim Nuclear Power Station during.
Cycle 5 with visually identified cracks in the core spray sparger. A list of meeting attendees, agenda, and slides used during the presentation l
are enclosed.
t Information was presented to support the conclusion that the sparger will retain structural integrity throughout the next cycle, although core spray flow distribution may be affected due to through-wall cracks.
However, core spray flow delivery to the shroud interior would not be expected to change.
A loose parts analysis was presented which addressed (1) corrosion, (2) flow blockage, and (3) control rod interference. The staff suggested that the operators be made aware through training and procedures of the possibility, although extremely small, of control rod interference due to loose sparger fragments.
Based on results from other sparger inspections and previous pipe cracking experience, it appears that cold work and sensitization during fabrication and installation stresses are major contributors to the observed cracks, which are believed to be initiated by intergrannular stress corrosion.
To support power operation in Cycle 5 with the core spray sparger as is, BECo has comitted to reanalyze ECCS taking credit only for core spray reflood, taking no credit for core spray heat transfer. The analysis is proceeding with a full break spectrum to be covered.
It is expected that the limiting break will be the recirculation suction line and a MAPLHGR limit reduction will likely be imposed during Cycle S to compensate for the assumption of no core spray heat transfer.
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8004030 331 :
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i The staff requested a minimum 3 weeks lead time to complete its review prior to the plant's return to power.
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John N. Hannon, Project Manager Operating Reactors Branch #3 Division of Operating Reactors
Enclosures:
As stated a
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PILGRIM CORE SPRAY SPARGER INDICATIONS BOSTON EDISON COMPANY AND GENERAL ELECTRIC March 13,1980 Boston Edison Company C. Andognini J. Fulton MPR Associates W. Schmidt NUS/EPRI R. Bender Georgia Power Company J. Edwards 9.E J. Lemaire S. Ranganath J. Charnley G. Nelson A. Alai J. Kilty R. Legate L. Zull R. Furgeson NRC T. Ippolito R. Hermann W. Morris H. Vander Molen J. Hannc-F. Coffman M. Mendonc, P. Grant S. Rubin C. Sellers W. Hazelton
PILGRIM CORE! SPRAY MEETING AGENDA
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1.
INTRODUCTION JACK FULTON, BECO 2
~111. LOOSE PARTS ANALYSIS JIM CHARNLEY, GE IV.
MATERIAL ASPECTS J0E LEMAIER, GE V.
CONCLUSIONS CARL AND0GilINI,BEC0 l
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.x PILGRIM CORE SPRAY MEETING INTRODUCTION o
MEETIl1G FEBRUARY 29, 1980 '
- DISCUSS INDICATIONS FOUND AT PILGRAM STATION
- NOTIFY STAFF 0F ACTI0il PLANS o
LOCATION OF INDICATIONS o MOST LIKELY CAUSE - IGSCC o
PLANNED COURSE OF ACTION
- ESTABLISH SPARGER STRUCTURAL INTEGRITY
- OPERATE WITHIN MAPLHGR LIMITS RESULTING FROM TAKING NO CREDIT FOR CORE SPRAY HEAT TRANSFER
- INSPECT AT NEXT REFUELING OUTAGE 1
o PURPOSE OF THIS MEETING
- ESTABLISH SPARGER STRUCTURAL INTEGRITY
- ADDRESS AREAS OF CONCERN FROM FEB. 29, 1980 MEETING
- ESTABLISH MAPLHGR LIMITS RESULTING FROM TAKING NO CREDIT FOR CORE SPRAY HEAT TRAflSFER
- OBTAIN STAFF APPROVAL FOR STARTUP l
I
WILL DISCUSS SPARGER CONFIGURATION SPARGER MOUNTING FABRICATION SEQUENCE PLANT OPERATING HISTORY STRESSES DURING NORMAL PLANT OPERATION POSTULATED INSTALLATION STRESSES STRESSES DURING CORE SPRAY INJECTION STRUCTURAL INTEGRITY OF A SPARGER H1IR CRACKS -
SOME BOUNDING CONDITIONS CONCLUSIONS
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