ML20127J730
| ML20127J730 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 10/25/1966 |
| From: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20127J719 | List: |
| References | |
| NUDOCS 9211190408 | |
| Download: ML20127J730 (5) | |
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l'NTILD STATLS GO\\'r.RNMlWF demorandum 10 2 Ti.e lilec 3.r a 001 i; L tr4 d DIEU: Eoger S. Loyd, Chief hereerch & Pever Eeector Safety Branch, DEL I I"*
WaltenJencenl/
Lerer;rch & Fover Eeactor Defety Branch, DhL WBJLcT:
FIELD CONOTEUCTION OF THE 7;SP PRIMAhY VEOSEL 50-A.63 On October 11. lo6f, e tLeeting voc held between the Eegulatory Stef2 ond the oppliennt for the Monticello Nuclear Generating P.lant.
The following perconc vere present:
ATTGDANCE LIST DRL G. E.
P. A. Morris A. M. Huttard R. ?s. Donn L. C. Koke E. S. Boyd J. J. Fox D. R. Muller I. B. Kobre J. Shee L. h. Vancott B. Gritnec H. Hollingshnuo W. Jenren J. F. Violette P. Chech W. Schultheio (Wn Office)
CMI ACES Staff E. A. Johrde R. H. Wilcox D. W. Culver E. F. Varnum Parameter. Inc.
P. Arnold A. F. Cota Consultant R. A. Lory J. J. Chyle NCP 1
Dave McElroy Arthur Dienhart Max Bolotsky Donald E. Nelson E. C.
( A1 ) Ward APED G.E.
B. J. Jencen McWhorter Div. of Ccepliance AEC L. KornH ith A. B. Holt p
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Buy U.S. Satings Bonds Rcgul.ni) on tlw Payroll Sarings Plan 9211190408 661025 PDR ADOCK 05000263
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Files 5 E6 The Monticello primary vessel vill be transported to the site in sections and there assembled.
Since all other reactor primary vessels have been shop fabricated, special scrutiny will be given this construction by the Regulatory Staff to ensure that there vill be no decrease in quality due to field fabrication.
The applicant contends that this criterion vill be met.
From presentations by the evolicant and from questions raised by the staff the following informavion on the design and fabrication of the Monticello primary vessel is complied, assel resign The respensibility for the vessel design is as follows:
0.E. is respon-sible for the steady state thermal stress analysis, the transient thermal stress analysis and certification of the G.E. analysis.
Chicago Bridge and Iron is responsible for the sizing and detailed configuration, the primary stress analysis, certification of the design report and compliance with Section III of the ASME Code.
General Electric vill also review the design drawings hnd analysis done by CB&I.
The reactor vessel vill be constructed of the following:
PLATE: ASME SA-533. Grade B, Class 1, per code case 1339-2 FORGINGS: ACME SA-506, Class 2, per code case 1332-2 BOLTING: ASME SA-540, Grade B2h, Class 305 CORE STRUCTURE:
(T) Inconel - ASME SB-166 The NDT requirement vill be 30 ft/lb charpy V notch for the plate and forgings.
This requirement must be met at 100F by the flange and bolts and at 400F by steel at other locations. No toughness tests vill be performed on the clading.- The hydrostatic strength on the vessel vill be at least 1000F to present no brittle cracking problem.
The vessel is designed for 100 tests at operating pressure but for only 3 at 1250 psi.
However, it vos stated that the vessel could withstand from 1,000 to 2,000 cycles of 1.25 times design.
Flat spots in the vessel receive consideration only as required by the code.
Vessel Fabrication and Assembly The vessel vill be sent to the field in 15 sections plus 2 skirt pieces.
The field assembly vill consist of the local fit-up of the vessel into the upper _ and lover head and 4 rings and the final fit-up of the 6 subsections forming the erected vessel.
Stainless steel overlay velding vill be performed in the shop on the temporary assembled rings.
Each ring vill then again be bisected before shipment to the field.
The veld grove for the field fjt-up vill be cut in the field at a 30 off set.
The two exit recirculation nozzles vill be attached to the lover ring in
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OL1 251%S Files the field into holes which will le field cut to prevent distortion.
With the lover head fitted onto the shirt and the first ring added, the control rcd thimbles are bored using a vertical mill with which Clel expecto to letter the H/16" maximum excentricity experienced with shop fabricated vessels.
7he vessel centerline is established by the temporary template used in the boring operation and is maintained through the assembly.
Procedures Review As each ring is added to the assembly, a temporary furnace is con.
structed at the seem with the exception of the first seam. A luminous flame at the vessel centerline vill supply radiant heat with constant temperature throughout the seam maintained by inculation on the vessel exterior.
Thermal gradients vill be limited to 300 F/ foot.
The first seam vill be stress relieved using local convective heaters due to space limitations. All velds vill be stick electrode and all field velds vill be manual.
Fabrication of the 15 sections in the shop was then described.
The bottom head dollar plate vill be assembled from three plates and vill be 0
hot ultrasonic tested at 3000F to h00 F, Any flave beyond the code requiremente vill be removed prior to stress relief.
Stress relief vill be at 11500F for between 1 to 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> and then the velds will be radiographed.
If flaws are repaired, the plate vill again be hot ultra-sonic tested, stress relieved, and radiographed.
The knuckle portion vill be assembled from 8 segments, tested and heat treated in a similar fashion as the dollar plate.
If no flaws are found, the bottom head vill be overlaid on the inside with 308 stainless steel and stress relieved.
The ovnrley operation vill be manual and the plates will be maintained et 300 F throughout the operation.
Following heat treat-0 ment at 1050 F to 1100 I, the clad vill be tested by ultrasonic and dye penetrant.
The rinEs vill be temporarily assembled from two sections and the small nontles vill be installed in an alternate sequence and then stress relieved.
Finally, the rings are cut in halves and the butt veld prepa-ration is made by flame cutting.
Before leaving the shop for the field, the halves vill again be assembled and match vorked.
At the field, the dollar plate vill be velded to the knuckle portion, cold ultrasonic tested and stress relieved.
The veld is expected to be 5 to 8% ferrite and each bend vill be peened and wire brushed.
Nozzles vill be radiographed if possible and vill be ultrasonic tested.
In large butt velds the bend vidth will be limited to three times the electrode width.
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Files 4-Field velds vill be radiographed with approximately 10,000 shots of Cobalt-60 taking h to 5 hout t exposure for each shot.
he ronts vill be magne'ie particle inspected after gouging.
Welds vill be hot ultrasonci tested after the stress relieving operation i
after which the veld is preheated again and the overlay is put on the 1
veld area. Subsequently, the veld is again heat treated and ultrasonic tested. Tinally there vill be up to 6 post-veld heat treatments.
The vessel chirt vill be mild steel and vill not be radiographed.
he first two feet of the skirt vill be velded on the bottom head at the i
shop.
Thus veccel alignment vill be determined at the shop.
Vessel velde vill be supervised at all time by one supervisor for 8 to 10 veldero.
The velders vill be 50% local men for the containment and 100% local men for the vessel.
Hovover, these personnel may be switched between the two jobo.
After passing a code grade test, the velders must take CB&I training with vessel scrap material.
Q_uality Control CBLI will test ultrasonic inspection all incoming plates to accure higher gus11ty plate than is required by the vendor, Lucan Steel.
The basic for all fabriention and quality control vill bei 1.
The contract 2.
General Electric Specifications (ASME Code) 3 General 11ectrie quality control plan-4 Approved drawings
- 5. ' Approved procedures Quality control in the field vill be aided by a mechanical engineer and metallurgist.
Vessel Internals and Core Support The maximum earthquake is the basis of the core internals design.
Cal-calationa ahov that the MCA vould put 60 poi across the lover plate and 40 to h5 pot across the core.
The core shroud d.3 stiffened at the sides
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OCT l' L 13M by gussets place 3 between the jet pumpo.
The shroud weight is carried j'
by the lover ring.
Supports for jet pumps and the feedwnter spurgers j
are built up from the vessel sides.
The spray spargers are supported 2
by L shaped brackets which allow for thermal expansion.
The design is t
l for the thermal gradient produced by 700 F vater in the sparger with the l
vessel at 545 F.
Inconel is used as a transition material between the 0
carbon steel vessel and the stainless steel shroud.
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The applicant was informed that the staff vill generate a list of questions j
relating to the acceptability of site assembly which may be separate from j
questions of a more general nature and that all vessel components vill be reviewed more closely than in the past.
l Dist ribution i
14tL headin6 j
R&PRSB Reading i
J. Shea B. Grimes H. Ixenton, CO M. Bolottky, SS E. G. Case W. Jenson 4
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