ML20213D621
| ML20213D621 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 03/28/1981 |
| From: | Nonnan V, Noonan V Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0345, CON-WNP-345 WNP-345, NUDOCS 8104070231 | |
| Download: ML20213D621 (6) | |
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Docket No. 50-397 Eg(4 PCT /lt, g0 8/A IB
%,h MEMORANDUN FOR: Rober:t L. Tedesco. Assistant Director
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for Licensing Division of Licensing O
to FROM:Q Vincent S. Noonan, Assistant Director
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for Materials & Qualifications Engineering Division of Engineering
SUBJECT:
GDC 51 COMPLIANCE: WASHINGTON PUBLIC POWER SUPPLY (WPPS) NUCLEAR PRGJECT 2 Plant Name: Washington Nuclear Project No. 2 (WNP-2) l Suppliers: General Electric; Burns & Roe Licensing Stage: OL Docket Number: 50-397 Responsible Branch and Project Manager: LBil; M. D. Lynbh Reviewer:
J. Halapatz Requested Completion Date: Open Description of Task: SER Input'Re GDC 51 Compliance Review Status: Continuing In assessing the compliance of the materials of the containment pressure boundary of the Washington Nuclear Project No. 2 with the requirements of GDC 51 the Materials Engineering Branch requires additional information.
The additional information required is identified in the attachment to this niemorandum, t
Vincent S. Noonan, Assistant Director Materials & Qualifications Engineering Division of Engineering I
Contact:
J. Halapatz Distribution X29484 Central File MTEB Reading File Attachment RE WNP-2 cc:
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OFFICI AL F ECORE COPY
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ATTACHMENT Fracture Prevention of Containment Pressure Boundary We have assessed the ferritic materials in the Washington Nuclear Project No. 2 containment system that constitute the containment pressure boundary to determine if the material fracture toughness is in compliance with the requirements of General Design Criterion 51, " Fracture Prevention of Containment Pressure Boundry."
GDC-51 requires that under operating, maintenance, testing and postulated accident conditions, (1) the ferritic materials of the containment pressure boundary behave in a nonbrittle manner, and (2) the probability of rapidly propagating fracture is minimized.
The WNP 2 primary containment includes a ferritic steel containment vessel enclosed within a reinforced concrete structure. The,ferritic materials of the containment pressure boundary which were considered in our assessment were those applied in the fabrication of the containment vessel, equipment hatch, personnel airlocks, penetrations, drywell head and piping system components, including the isolation valves required to isolate the system.
These components are the parts of the containment system which are rot backed by concrete and must sustain loads.
The WNP 2 containment pressure boundary is comprised of ASME Code Class 1, 2 and MC components. In late 1979, we reviewed the fracture toughness requirements of the ferritic materials of Class MC, Class 2 and Class 1 components which typically constitute the containment pressure bcundary.
Based on this review we determined that the fracture toughness requirements contained in ASME Code Editions and Addenda typical of those used in the design of the WNP 2 containment may not ensure compliance with GDC-51 for all areas
of the, containment pressure boundary. We initiated a program to review fracture toughness requirements for containment pressure boundary materials for the purpose of defining those fracture toughness criteria that most appro-priately address the requirements of GDC-51. Prior to completion of this study, we have elected to apply in our licensing reviews the criteria identified in the Summer 1977 Addenda of Section III of the ASME Code for Class 2 components.
These criteria were selected to ensure that uniform fracture toughness requirements, consistent with the containment safety function, are applied to all components in the containment pressure boundary. Accordingly, we have reviewed the Class 1, 2, and MC components in the WNP 2 containment pressure boundary according to the fracture toughness requirements of the Summer 1977 Addenda of Section III for Class 2 components. However, in order to complete our review, we require additional information because the FSAR does not provide the information necessary to characterize the fracture toughness of the reactor containment pressure boundary within the context of GDC-51. We' request, there-fore, that the following information be provided by the applicant:
1.
Lowest Service Metal Temperature The lowest service metal temperature within the context of the effective NE 2300 and GDC-51.
2.
Penetrations (a) Listing of all containnent hot and cold pipe penetrations and related supplemental information which identifies penetration assembly sleeve, i
process pipe and end closure caterials by specification, final heat treat condition, nominal OD and schedule, wall or section thickness.
(b) Full size assembly and detail drawings showing as-built configurations and dimensioning of hot and cold pipe penetraions.
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An (c) Fracture toughness data relating to the materials of those parts of penetration assemblies which perform the containment function and provide a pressure boundary under the conditions cited by GDC-51.
3.
Drywell Head-Equipment Hatch And Personnel Access Airlock (a) Full size assembly drawing and detail drawings which identifiy and dimension those parts which constitute parts of the containment pressure boundary.
(b) Supplemental information related to item 3(a) above which identifies materials of the parts of interest by specification, final heat treat condition and section thickness.
(c) Fracture toughness data relating to the materials of those parts which perform the containment function and provide a pressure boundary under the conditions cited by GDC-51.
4.
Main Steam - Main Feedwater - Auxiliary Feedwater System (a) Full size piping diagrams and related pipeline list, pipe design tables which identify these systems by line designators and pipe size, schedule or wall and material by specification and grade and which identify valves by number, type and valve pressure boundary materials by specification, grade and final heat treat condition.
(b) Fracture toughness data relating to the material of those parts of the main steam-main feedwater and auxiliary feedwater systens which perform the containment function and provide a pressure boundary under the condition cited by GDC-51.
(c) Graphic legend information relating to piping diagrams addressed in item 4(a).
Should,the fracture toughness data requested under items 2(c), 3(c) and 4(b) above be unavailable, the applicant is requested to provide the following information for the materials of interest.
1.
Seamless Pipe (a) Billet heating temperature prior to piercing (b)
In-process reheat temperatures (c) Stock wall thickness prior to final sizing (d) Reheat temperature prior to final sizing (e) Pipe final heat treatment or pipe assembly heat treatment 2.
Seamless Ells (a) Stock heating temperature prior to hot forming (b)
In-process reheat temperatures (c) Ell final heat treatment or pipe assembly heat treatment 3.
Welded Pipe (a) Metallurgical heat treat condition of plate stock as entered into fabrication l
(b) Plate stock heating temperature prior to hot forming (c) In-process reheat temperatures (d) Pipe final heat treatment or pipe assembly heat treatment 4.
Welded Ells (a) Metallurgical heat treat condition of stock as enered into fabrication (b) Stock heating temperature prior to hot forming (c) In-process reheat temperatures (d)
In-process heat treatments
.c 5-(e) Ell final heat treatment or pipe assembly heat treatments 5.
Valves (a) Final metallurgical heat treat condition of the material of those parts which constitute parts of the pressure boundary.
(b) In-process postweld repair heat treatments of the material of those parts which constitute parts of the pressure boundary.
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