ML19317E982
| ML19317E982 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/05/1972 |
| From: | Peltier I US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8001070778 | |
| Download: ML19317E982 (3) | |
Text
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w e S UNITED STATES 5
/[M ATOMIC ENERGY COMMISSIL,N
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- bI WASHINGTON, D.C. 20545
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R. C. DeYoung, Assistant Director, PWRs, DRL q
THRU: Albert Schwencer, Chief, PWR Branch 4, DRL f
TELECON DETUEEN DRL. DRS, CO, B&W AND DUKE POWER COMPANY CONCERNING INVESTICATION, EVALUATION AND CORRECTION OF PROBLEMS ON OCONEE 1.
John McMillian identified George Kulynch as the recovery manacer who will coordinate all B&W cfforts to understand and correct the problems which have caused failure or damage to several internal components inside the Oconee Unit 1 reactor pressure vessel including instrumentation stub tubes, guide tubes and ther=al shield.
To carry out the work, several satellite organizations will be working in parallel. One of these organizations is a fact. finding task force headed by Jim Taylor, who has been a product ennager at Mt. Vernon. He is a systems engineer with manufacturing exoerience.
He was manager of technical support for the NSS Savannah. His task force vill have seccial capabilities in structural designs, thermal-hydraulics, metallurgy testing, operations, and vibration.
The charter of the task force is to catalog and screen the evidence of damage (which will take 2-3 weeks core) to obtain as complete a picture as possible then assess and evaluate this data to determine possible causes or need for further investigations or studies to supply vital information that =ay be missing.
2.
Other groups primarly uithin the manufacturing organizations will develop repair or product modification procedures as necessary for the Oconee Unit i steam cenerators (underway at the Barberten facility),
the reacror vessel (Mt. Vernon) and tne reactor internals (Barberton and Lynchburgh). The design aspects of work on the pressure vessel and the reactor internals depend significantly on the data being obtained by the fact finding task force.
3.
Elements of the recovery operation were identified as follows:
Survey of Oconee Unit 1 Systets This is undervav and includes visual examination and sone dye penetrant testin: of the reactor vessel incore nozzles (stub tubes), guide tubes flow vanes, the thermal shield and anchor pins, thermal shield bearinn suoport surface, lower grid, flow distributor, nos:les in the upper head, and plenum cylinder tubes. This work is approximately 60 percent cerolete.
Further disassembly is required and soecial care is required to preserve evidence of nature of dacace in the anchor nin and ther=al shield 4
bearing support areas.
B&W will advise us on intended procedures needed to accocalish this disassembly br hre proceeding.
,c 7 76 so n" g.1
j, Review of Pertinent Oconee Unit 1 Loes locs, instrument This will include all observations noted in thedat
- data, f interest. This pressures, tenperatures, flows over the ti=c cwork i her 2-3 weeks.
Review of Fabrication Record __
s d for the B&W is reviewing all pertinent fabrication recor s l
This work is expected to take about 2 weeks.
Vibration Investicative Procram on Core Intern d ction set of core internals new at Barberton.
support structure, and the thermal shield.
b
) and Guide _
Failure Mode Investiention on Incore N_ozzles (stub h incore nozzles B&W has a failure mode investication underway on t entrolled conditio Tubes and guide tubes in an atecent to duplicate unde inconel.
Confirmatorv Vibration Tests on Incore h
production d in design.
vessel (Midland) confirm natural freauencies use d with Hydraulics Effects Study _The 1/6 scale model flow studies d Use will also particular attention to unusual flew conditions.
for various ouma be made of the Oconee flow data (when reduced)As a combinations.
studies have not been ruled out at this time.
Metallureical and Chemical Investinatien i
l considerations.
A thorour,h review is planned of metallurcy and chem ca zzles This will include a thermal history of the reactor incore no d Oconee and chemical cleanine procedures followed at Mt. Vernon an water chemistry during hot functional testing.
ready Pending availability of results of work now underway, B&W is of the failures.
to offer a preliminary evaluation as to the cause 4.
h es Mr. McMillian indicated that there are likely to be design c ang affecting all B&W plants of this generation.
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9 5.
B&W will keep the AEC infor=ed as work progresses.
B&W point of contact is the recovery manager, George Kulynch.
Duka Power Company contact point on Oconee-related matters is S. Bisekicy.
A. Schwencer is the AEC point of centact, except for Division of Compliance matters requiring direct contact with Duke and B5W.
6.
Principals on this conference call were AEC Duke B&W A. Schwencer, DRL W. Owens J. H. McMillian I. Peltier, DRL P. Barten J. F. Mallay D. Lange, DRS K. Canady G. E. Kulynch M. Hildreth, CO J. H. Taylor g%&
\\A I. A. Peltier, Project Leader Pressurized Water Reactors Branch No. 4 Division of Reactor Licensing cc:
E. J. Bloch S. H. Hanauer P. A. Morris E. G. Case L. Rogers F. Schroeder R. H. Engelken (4)
DRL Assistant Directors DRS Assistant Directors PRR Branch Chiefs R. W. Klecker I. Peltier J. A. Murphy H. E. Schierling R. F. Fraley, ACRS M. Shaw, RDT A. J. Presseky, RDT Docket DRL Reading PWR-4 Reading PWR Reading
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