ML20052D180

Forwards Revised Responses to Concerns Identified in Draft SER from Mechanical Engineering Branch.Responses Will Be Incorporated in Subsequent Amend to FSAR

ML20052D180
Person / Time
Site:	Perry
Issue date:	04/29/1982
From:	Davidson D CLEVELAND ELECTRIC ILLUMINATING CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8205060340
Download: ML20052D180 (5)

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' THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P o DOX 5000 m CLEVELAND. ohio 44101 m TELEPHONE (216) 622 9800 m ILLUMINATING BLDG e 55 PUBLIC SoVARE Semng The B9st Location in the Nation D:lwyn R. DTck%

VtCL PHf SIDENT SYSTE M LNGINFi AING AND CONST AUCT40N April 29, 1982 Mr. A. Schwencer Chief, Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Response to Draft SER Mechanical Engineering Branch

Dear Mr. Schwencer:

This letter and its attachment is submitted to provide revised responses to the concerns identified in the Draft SER for Mechanical Engineering.

It is our intention to incorporate these responses in a subsequent amendment.to our Final Safety Analysis Report.

Very Truly Yours, b

Dalwyn R. Davidson Vice President Systan Engineering and Construction DRD: mlb c3 l

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• Question 16 The applicant to provide test results that show functional capability of BOP piping systems is assured at ASME Service Level C stress limits.

Response

The. applicant will demonstrate the functional capability of all piping components in essential ASME Class I, 2, and 3 piping systems designed using level C or D service stress limits. This shall include use of the criteria in the Interim Technical Position " Functional Capability of Passive Piping Components",

Mechanical Engineering Branch, Division of Systems Safety, attached. Where additional criteria are required to evalnate functional capability, applicable criteria in NEDO-21985, dated September 1978, shall be used, l

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ENCLOSURE - 2 IkIERIM TECHNICAL POSITION FUNCTIONAL CAPABILITY OF PASSIVE PIPING COMPONENTS MECHANICAL ENGINEERING BRANCH DIVISION OF SYSTEMS SAFETY I. Introduction The functional capability of all piping components in essential ASME Class 1, 2 and 3 piping systems designed to levels C or D service limits is required to be demonstrated. Applicants may choose to use the criteria in-Section II which require no further proof of func-tional capability. Piping cemponents within Section III require additional analytical or experimental proof that functional capabil-ity has been maintained.

The technical content of this position is based upon integrated experimental and analytical studies of piping system components per-formed at the Oak Ridge National Laboratory for the U.S. Nuclear Regulatory Commission. The progr:a of studies, the analytical and experimental results, discussior, and recommendations have been docu-mented in a report, " Evaluation of the Plastic Characteristics of Piping Products in Relation to ASME Code Criteria, ORNL/Sub-2913/8."

i II.

Situations in which Functional Capability is Assured without Further Proof s

a) Class 1 Piping Components:

1) Functional capability may be considered assured -

without further proof for any Class 1 piping component when the Level "A" or "B" or "C" limit is used with Equation (9) of NB-3650 provided D side diameEe/t $ 50, where D is the out-r and t is the wall thickness of the piping component. The Level "C" limi t to be satisfied for the above verification proce-dure is:

1.5 Sy for austenitic piping components, and

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• 2.25 Sm for ferritic piping components  :

2) For tees and branch connections, the Level "D" limit may be used with Equation (9) of NB-3650 without additional requirements for functional verification, provided l

D,/t ( 50.

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The Level "D" limit to be satisfied for the above verifi-

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cation procedure is:

2.0 Sy for austenitic piping ccoponents, and 3.0 Sm for ferritic piping components

.b) Class 2/3 Piping Components:

1) Functional capability may be considered assured for Class 2/3 piping components for Levels "A" and "B" limits in Equation (9) of NC-3652.1 or ND-3652.1 provided Dg /t < 50.

2) For tees and branch connections, Level "C" limits may be used without additional requirements for functional veri-fication. However, 'for elbows or bends, the following additional requirements shall be met whenever Level "C" limits are specified:

(a) Use (0.8 B ) instead of (0.75 i) but not less than 1.0. -

(b) Use (1.5 S ) or '(1.8 Sh), whichever is lower .

for the right-hand side of Equation (9).

In each of the above cases, D /t shel.1 be equal to or }

1ess than 50.

3) Class 2/3 piping components may be evaluated as Class 1 piping components for verifying functional capability pro-vided the rules and limits as specified in item II.A. ,

above, are met.

III. Situations in which Functional Capability Requires Additional Demonstration a) Class 1 Piping Components:

1) Piping components other than tees and branch connections, such as elbows, pipe bends and straight pipe, using Level "D" limi ts.

2) Any piping components with D,/T > 50.

b) Class 2/3 Piping Components:

1) Straight pipe when Level "C" limits are used.

2) Elbows or pipe bends which cannot meet the requirements specified in Item II.B.2, above, when Level "C" limits are specified.

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. 3) All piping componsnts when Lcyc1 "D" limits ara used.

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(NOTE: The ORNL report recommends against the use of Level "D" limits when functional capability must be maintained.)

4) Any piping camponents with D,/t ) 50.

IV. Definitions Functional Capability - Capability of piping components to deliver .

rated flow and retain dimensional stability when the design and service loads, and their resulting stresses and strains, are at prescribed levels.

Piping Components - These items of a piping system, such as tees, elbows, bends, pipe and tubing and branch connections, constructed in accordance with the rules of Section III of the ASME Code.

. Piping System - A group of connected piping components and other associated Code components (i.e., pumps, valves, vessels) performing jointly a specified plant function or, in the case of multifunc-tional systems, more than one function.

Essential Piping Systems - Piping systems which are necessary (a) for safe shutdown of the plant and to maintain the plant in a safe shut.down condition, or (b) to prevent or mitigate the consequences of an accident which could result in potential offsite exposures exceeding the guidelines of 10CFRPart100.

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