ML20054G625

Design Spec, Basis for Design of Drywall Containment Vessel Penetration

ML20054G625
Person / Time
Site:	Quad Cities
Issue date:	02/18/1979
From:	Keever R, Naymark S, Pashos T GENERAL ELECTRIC CO.
To:
Shared Package
ML20054G614	List: ML20054G613 ML20054G625
References
22A2505, NUDOCS 8206220146
Download: ML20054G625 (4)

Text

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EggINMNTVESSELPENEIRA-00MESTIC TURNKEY PROJECTS a a v. ~o. 0 sace ~o. 22A2505 s o ~o. O c o~, o so.r,1 DESIGN SPECIFICATION L-BASIS FOR DESIGN OF DRYWELL CONTAINMENT VESSEL PENETRATIONS ISSUED B '# eM~ , d R. E. K'eever T. J. Pashos, Manager Technical Leader Balance-of-Plant Engineering Design Engineering

• P APPROVED BY:

U}Nb S . Naymark,g'[.4anager Project Eng'ineering i

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GEN ER AL ([) ELECTRIC gggg;yjjjyjEQjSsE P A COMESTIC TURNKEY PROJECTS TIONS

..c.~o. 22A2505 a v. ~e. O i~.. 1 co~,o~.-ar'2 DESIGN SPECIFICATION L

BASIS FOR DESIGN OF DRYWELL CONTAINMENT VESSEL PENETRATIONS The following criteria are intended to define certain loading conditions and allowable stress levels in the containment vessel in the areas adjacent to any and all penetrations.

A. Nornal Operating and Design Accident Conditions

( For normal cperating and the design accident conditions (normal thermal expansion, dead loads, seismic loads; and thermal growth and pressure conditions resulting from loss of coolant within the drywell), the maximum allowable stress levels shall be:

1. General membrane stresses g, Sm

2. Local membrane stresses s 1.5 Sm

3. Bending stresses A 1.5 Sm Where Sm is the allowable tensile stress for the material in question as specified in Section VIII of the ASME boiler & Pressure Vessel Code.

B. Pipe Rupture Accident Conditions For pipe rupture accident conditions (all loads specified in (A) except that the seismic load shall be two times normal seismic load, and all loads transmitted to shell via the penetration assemblies resulting from a pipe rupture either internal or external to drywell) it shall be shown that the containment is maintained in accordance with requirements of Table I, Page 3. An acceptable means of demonstrating this shall be:

1. . Calculated stresses

• limited to:

a. Local membrane stresses g. 1.5 Sm

b. Local membrane + secondary membrane + secondary bending g, 3 Sm

2. In lieu of calculated stresses noted above, appropriate load-deflection tests confirming ability of containment to withstand pipe rupture loads will be acceptable.

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• Tha stress levels indicated in (A) and (B) above are in accordance with ASME Boiler &

Pressure Vessel Code,Section III. It should be noted tnat limiting the stresses to 3 Sm will result in a maximun stress i cvel equal to 75% of the ultimate strengen (d" ULT) 7 of the material since Sm = 25% d'my -

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G EN ER AL ([) ELECTRIC BASIS FOR DESIGN OF DRYWELL CONTAINMENT VESSEL PENETRA-COMESTIC TURNKEY PROJECTS TIONS

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Analysis of pipe rupture loads shall include the effect of jet reaction loads and jet impingement loads, but the two loads should not be applied simultaneously to a single penetration. These loads are defined as:

1. Jet reaction load - a reaction load acting on a process line due to rupture of line.

2. Je.t impingement load - a load acting on a process line resulting from rupture of an adjacent line, f

The jet reaction load resulting from either a circumferential pipe break or a longitudinal pipe break shall be taken as the product of the internal pressure of the line and the flow area of the line. The break shall be assumed to occur at a point which will result in the maximum loading on the containment shell.

The jet impingement force at its origin (at the point of pipe rupture) shall be taken as the product of,the internal pressure and the flow area of the ruptured line. To deter-mine the effective impingement force on an adjacent line, the following factors shall be considered:

1. A longitudinal break is assumed to be in the form of a rectangle whose length is equal to twice the inside diameter of the pipe. The cross sectional area of a longitudinal pipe break shall be equal to the internal cross sectional area of the ruptured line.

2. As the coolant leaves the pipe, a portion of the wdter flashes to steam resulting in an angular expansion of the two-phase mixture as a function of distance from the break.

The included angle of the spreading two-phase mixture is to be taken as 45*.

3. As the two-phase mixture strikes an adjacent pipe, the curvature and size of the pipe and the length of pipe being struck by the mixture shall be taken into account in calculating the resultant jet impingement force on the pipe.

Application of factors in "2" and "3" above will result in attenuation of the initial jet force (at the break) as a function of distance f rom the break and size and curvature of the pipe being impinged upon.

Shell stresses resulting from pipe rupture loads shall be calculated using the "Bijlard" method as set forth in Welding Research Council (WRC) Bulletin No. 107.

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• ' GENERALOitectaic 8 818 roa ote1Cs Or oxxwEtt CONTAINMENT VESSEL PENETRA-00MESTIC TURNKEY PROJECTS TIONS

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DESIGN SPECIFICATION N Primary Containment Boundary Inner Outer Isolation Valve Isolation Valve .

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3 I b+ < >  ;' b TABLE I Break Type of Component Integrity Necessary Region Break to Assure Containment Long.

Inner Isolation Valve or Cire. Outer Isolation Valve Plus Primary Containment Boundary Lone. Inner Isolation Valve

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( Outer Isolation Valve Plus Primary Containment Boundary Long. Inner Cire. Isolation Valve Long. Inner Isolation Valve Circ, or f-Outer Isolation Valve

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