ML19341B729
| ML19341B729 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 01/29/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8102270239 | |
| Download: ML19341B729 (8) | |
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UNITED STATES y ' g,, q '.. j NUCLEA'{ REGULATORY COMMISSION t
WAEMINGTON. D. C. 20555
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Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Company P. O. Box 960 g,y 2 0 E81 Cincinnati, Ohio 45201 cc: Troy B. Conner, Jr., Esq.
Lear. S. Kosik, Esq.
Conner, Moore & Corber 3452 Cornell Place 1747 Pennsylvania Avenue, N.W.
Cincinnati, Ohio 45220 Washington, D.C.
20006 W. Peter Heile, Esq.
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Mr. William J. Moran Assistant City Solicitor General Counsel Room 214, City Hall Cincinnati Gas & Electric Company Cincinnati, Ohio 45220 P. O. Box 960 Cincinnati, Ohio 45201 John D. Woliver, Esq.
Clermont County Community Council Mr. William G. Porter, Jr.
B3x 181 Porter, Stanley, Arthur.
Batavia, Ohio 45103 and Platt 37 West Broad Street
- trs. Mary Reder Columbus, Ohio 43215 Box 270, Rt. 2 California, Kentucky 41007 Mr. James D. Flynn, Manager Licensing Environmental Affairs Andrew B. Dennison, Esq.
Cincinnati Gas & Electric Company -
200 Main Street P. O. Box 960 Satavia, Ohio 45103 Cincinnati, Ohio 45201 Robert A. Jones, Esq.
David Martin, Esq.
Prosecuting Attorney of Clennant Office of the Attorney General County, Ohio i
209 St. Clair Street 15' Main Street First Floor 3atavia, Ohio 45103 Frankfort, Kentucky 40501 Resident Inspector /Zimer Dr. Frank F.. Hooper
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RFD 1. P. O. Box 2021_
School of Natural Resources J. S. Route 52 University of Michigan
- toscow, Ohio 45153 _
l Ann Arbor,- Michigan 48109 t
Ltr. John Youkilis Charles Bechhoefer, Esq., Chairman Office of The Honorable William Gradison Atomic Safety & Licensing Board Panel United States House of Representatives 3
l U.S. Nuclear Regulatory Comission
~.lashington, D. C.
20515 i
l Washingto, D.C.
20555 Mr. Glenn 0. Bright Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Commission
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION Fracture Prevention of Containment Pressure Boundary We have assessed the ferritic materials in the W. H. Zimmer Nuclear Power Station, Unit 1 containment system that constitute the containment pressore boundary to determine if the material fracture toughness is in compliance with the requirements of General Design Criterion 51, " Fracture Preventien of Containment Pressure Boundary."
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 Zimmer Unit 1 primary containment is a reinforced concrete structure with a thin steel liner on the inside surface which serves as a'leaktight membrane. The ferritic materials of the containment pressure boundary t
which were considered in our assessment were those applied in the fabrication of the equipment hatch, personnel airiocks, penetrations, drywell head and piping system gomponents, including the. isolation valves required to isolate the system. These components are the parts of the containment system which are not backed by concrete and must sustain loads.
The Zimmer Unit 1 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
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. pressure boundary. 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 Zimmer Unit 1 Primary containment may not ensure compliance with GCC-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 appropriately o ior co completien of this study, address the recuirements of GDC-51.
r we have elected to apply in our licensing reviews the criteria identified in the Sumcer 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 PC components in the Zimmer Unit 1 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 addttional 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, therefore, l
that the following information be provided by the applicant:
1.
Lowest Service Metal Temeerature The lowest service metal temperature within the context of the effective NE 2300 and GDC-51.
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5 l 2.
Penetrations (a) Listing of all containment ht' and cold pioe penetrations and related supplemental information which identifies penetration assembly sleeve, process pipe and and closure materials by speci-fication, final heat treat condition, nominal 00 and schedule, wall or section thickness.
(b) Full size assembly and detail drawings showing as-built configurations and dimensioning of hot and cold pipe penetrations.
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(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.
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3.
Drywell Head-Eauf ement Hatch And Personnel Access Airlock i
-(a) Full ' size assembly drawing and detail drawings which identify 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-centainment function and provide a pressure boundary under the conditions cited by GDC-51.
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Main Steam - Main Feedwater - Auxiliary Feedwater System (a) Full size piping diagrats 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 materia. of those parts of the main steam-main feedwater and auxiliary feedwater systems which perform the pontainment function and provide a pressure boundary under t conditions cited by GDC-51.
(c) Graphic legend information relating to the piping diagrams addressed in item 4(a).
i 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 e
following information for the materials of interest.
i 1.
Seamless Pioe (a) Billet heating temperature prior tu piercing (b)
In-process reheat temperatures-(c) Stock wall thickness prior to final sizing
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, (d) Reheat temperature prior to t.
a sizing (e) Pipe final heat treatment or pipe assembly heat treatment 2.
Seamless Ells (a) Stock heating temperature crior to hot forming (b)
In-process reheat temperatures (c) Ell final heat treatment or pipe assembly heat treatment 3.
Welded Pice (a) Metallurgical heat tr.
- cndition of plate stock as entered into fabrication (b) Plate stock heating temperature prior to hot faming (c)
In-process reheat temperatures
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(d) Pipe final heat treatment or pipe assembly heat treatment l
4.
Welded Ells (a) Metallurgical heat treat condition of stock as entered into fabrication 6
(b) Stock heating temperature prior to hot forming (c)
In-process reheat temperatures (d)
In-process heat treatments
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. (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 bcundary.
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(b)
In-process postweld repair heat treatments of the material of those parts which constitute parts of th? pressure boundary.
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