ML20203N980

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Nonproprietary Rev 1 to 1.14, Sys Std Design Criteria NSSS Containment Isolation
ML20203N980
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 12/04/1970
From: Bradbury C, Loose R, Snyder W
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20203N965 List:
References
1.14-01, 1.14-1, NUDOCS 8610200164
Download: ML20203N980 (28)
v • d • e


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.4 ATTACMMENTS TITLE SYSTEMS STANDARED DESIGN CRITERIA NUCLEAR STEAM SUPPLY SYSTEM CONTAINMENT ISOLATION FOR EXTERNAL USE 8610200164 861010 hDR ADOCK 05000327 PDR WESTINGHOUSE ELECTRIC CORPORATION Nuclear Energy Systems P O Som 3s5 Pittstwesh. Pennsylvanie 15230 APPROVAL OmsG NAL issus REV 1 PkV 2 AUTHOR c

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M AN AGE R. SYST E MS ST AND ARDS & ANAL.

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  • e SYSTEMS STANDARD TABLE OF CONTENTS Section Title Page 1.0 Introduction 1

2.0 General Containment Isolation Criteria 1

3.0 Testing of Isolation Valves 5

4.0 Legend 7

5.0 Reactor Coolant System (RCS) 8 6.0 Chemical and Volume Control System (CVCS) 11 7.0

-Residual Heat Removal System (RHRS) 12 8.0 Component Cooling System (CCS) 15 9.0 Waste Disposal System (WDS) 17 10.0 Safety Injection System (SIS) 19 11.0 containment Spray System 25 12.0 Sampling System 28 i

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1.0 INTRODUCTION

The purpose of this document is to provide criteria for containment isolation and standard arrangements for meeting this criteria for each of the NSSS lines penetrating the containment wall. Diagrams showing NSSS fluid system lines penetrating the containment wall are included in this document. The sketches include brief notes describing the standard isolation valve arrangements shown. The diagrams also indicate recommended locations for gas test connections to be provided by the customer, if required.

In many cases, existing vents and drains can be used for these test.ing functions.

In general this document includes the containment penetrations for the NSSS for all present Westinghouse PWR plants. However, for some plants 1

there may be-cases which may not be specifically covered by this document.

In this event, these special cases shall be_ handled on an individual i

a basis.

,1 The information contained in this document reflects Westinghouse Nuclear Energy Systems (WNES) interpretation of good design practice as to provisions to be made for meeting current Atomic Energy Commission (AEC) requirements regarding containment isolation. This document will be updated as necessary to reflece any new information.

2.0 GENERAL CONTAINMENT ISOLATION CRITERIA Piping which penetrates the containment and is not required to function following a loss-of-coolant accident must be provided with two automatic isolation barriers; one barrier must be located outside the containment and one must be inside the containment.

The definition of an automatic barrier is either a closed system, trip valve or check valve.

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I Using this definition four general classifications are derived:

A.

Two closed systems -- one inside, one outside, no isolation valves required.

B.

No closed systems -- one valve inside and one valve outside r,equired.

C.

Clo' sed system inside -- no valve inside, valve required outside.

D.

Closed system outside -- no valve outside, valve required inside NOTE:

1.

The same criterin apply to lines which are used after an accident except. that manual isolation outside containment is acceptable.

2.

For lines 1-inch nominal pipe size and larger which penetrate the containment and which are connected to the Reactor Coolant System, at least two valver shall be provided inside the cont'ainment. The valves shall be normally closed or shall have automatic closure. For incoming lines check valves are permitted and are considered as automatic.

The requirements for a closed system include the following:

In=ide Containment '

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Does not communicate with either the reactor coolant system or the reactor containment interior.

2.

Safety classification same as for engineered safety systems 3.

Must withstand external pressure and temperature equal to-containment design pressure and temperature 4.

Must withstand accident transient and environment 5.

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Outside Containment 1.

Does not communicate with the atmosphere outside the containment 2.

Safety Classification same as for engineered safety systems 3.

Internal design pressure and temperature must be at least equal to containment design pressure and temperature Based on the four general classifications the following types of valves would be used.

Classification Incoming Lines Outgoing Lines A

No valves required No valves required B

Trip valve outside and Two trip valves, one li check valve inside or inside and one out-3 I

two trip valves, one in-side.

side and one outside C

Trip valve or check Trip valve outside valve outside, no no valve inside -

valve inside ll D

Trip or check valve in-Trip valve inside, side, no valve outside no valve outside l

All valves used for containment isolation must be capable of tight' shutoff against gas leakage from containment design pressure down to approximately zero psig.

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". SYSTEMS STANDARD Protection against overpressure due to thermal expansion of the water between the containment isolation valves is provided. A bypass check valve is used to prevent overpressure between gate valves when used for containment isolation. Lifting of the valve dise will prevent overpressurization when air operated globe or diaphragm valves are used for containment isolation.

3.0 TESTING OF ISOLATION VALVES Although there may be certain exceptions, it is a general requirement that all containment isolation valves be tested periodically with gas to determine their leaktightness. This will be done by establishing a test volume in the piping so that the valve is exposed to gas at con-tainment design pressure. Check valves and single-disk gate valves must have the test pressure applied to the inboard side of the valve (the side toward the' center of the containment). Diaphragm valves may be tested from either side since their leakage characteristics are the same in either diraction. Double-disk gate valves may be tested by applying the test pressure between the disks. Globe valves may be tested either by pressurizing the inboard side or by pressurizing under the seat.

Wherever such testing is to be done, various connections must be made to supply test gas to the appropriate sections of piping. The general locations of thes'e test connections are indicated by the TC symbol on the following ' diagrams.

It would also be necessary to vent the piping connected to the valve on the side opposite the test volume. The locations of these test vents are indicated by the TV symbol on the following diagrams.

In most cases, existing equipment vents or drains can be used to perform this function. Since the test gas must impinge directly upon the valve being tested, the test connections and/or vents should be located so as to facilitate adequate draining of the test volume.

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