ML20203N976
| ML20203N976 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/11/1970 |
| From: | Bradbury C, Gallagher J, Loose R WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20203N965 | List: |
| References | |
| 1.14-01, 1.14-1, NUDOCS 8610200160 | |
| Download: ML20203N976 (19) | |
Text
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ESTINGMOUSE POmM 55132 EDE NTIF IC ATION NO DATED RE VIE 10N NO.
DATED ORIG 8N A L ISSWE SUPERSEDES 3/70 O
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ATTACHMENTS TITLE
' SYSTEMS STANDARD DESIGN CRITERIA NUCLEAR STEAM SUPPLY SYSTEM C0h7AINMENT ISOLATION O
FOR EUERNAL USE 8610200160 861010 DR ADOCK 05000327 PDR WESTINGMOUSE ELECTRIC CORPORATION Nuclear Energy Syseems P.O. Boa 355 Pettsburgh. Pennsviveme 15230 APPROVAL
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TABLE OF CONTENTS Section Title Page 1.0 Introduction 3
2.0 General Containment Isolation Criteria 3
3.0 Testing of Isolation Vaives 6
4.0 Legend 7
5.0 Reactor Coolant System (RCS) 8', 9 6.0 Chemical and Volume Control System (CVCS) 10,11 7.0 Residual Heat Removal System (RHRS) 12 8.0 component Cooling System (CCS) 13,14 9.0 Waste Disposal System (WDS) 15,,16 10.0 Safety Injection System (SIS) 17,18,19 l
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I 1,14 SWEEb6 STANDARD
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 each NSSS fluid systems line 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 testing functions.
The information contained in this document reflects Westinghouse Nuclear L
. Energy Systems O?NES) interpretation of good design practice as to provisions t
to be made for meeting current Atomic Energy Commission (AEC) requirements.
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regarding containment isolation. This document will be updated as necessary b
to reflect any new information.
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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
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isolation barriers; one barrier must be located outside the centainment and~
one must be inside the containment.
5 The definition of an automatic barrier is either a closed system, trip valve.
or check valve.
r Using this definition four general classifications are derived:
- i 1.
Two closed systems -- one inside, one outside, no isolation valves required.
l 2.
No closed systems -- one valve inside and one valve outside required.
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3.
Closed system inside -- no valve inside, valve required outside.
4 Closed system outside -- no valve outside, valve recuired inside.
NOTE: The same criteria anply to lines which are used after an accident except that manual isolation is acceptable.
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The requirements for a closed system include the following:
Inside Containment 1.
Safety classification same as for engineered safety systems.
2.
Must withstand external. pressure and temperature equal to containment design pressure and temperature 3.
Must withstand accident transient and environment 4.
Must be missile protected
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Outside Containment 1.
Safety classification same as for engineered safety systems 2.
Must be missile protected 3.
Internal design pressure and temperature must be at least equal to cont'ain-ment design pressure and temperature Based on the four general classifications the following types of valves would be used.
Classification Incomine Lines Outgoinz Lines C
A No valves required No valves required B
Trip valve outside and Two trio valves, check valve inside or one inside and two trip valves, one in-one outside side and one outside C
Trip valve or check Trio valve outside, valve outside, no' no valve inside valve inside D
Trip' or check valve in-Trip valve inside, side, no valve outside no valve outside All check valves used for containment isolation must be of'the special (soft seat) type capable of tight shutoff at containment desig,n pressure against gas leakage.
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3,14 INSTEMS STANDARD 3.0 TESTING OF ISOLATION VALVES It may be required that all containment isolation valves be tested periodically with gas to determine their leak tightness. This would be done-by. establish-ing a test volume in the piping so that the valve is exposed to gas at the containment design pressure. Globe valves, gate valves, and check valves must have the pressure applied from the containment side while diachragm valves alone may be tested from either side since their leakage characteristics are the same in both-directions.
If 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 these test connections are indicated by the TC symbol on the following diagrams.
It would also be necessary to vent the piping connected to the I'
valve on the side opposite the test volume. The locations of these test
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vents are indicated by the TV symbol on the following diagrams.
In many cases, existing equipment vents or drains can be used to perform this function.
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Since the test gas must impinge directly upon the valve being tested, the l~
the test connections and/or vents should be located so as to facilitate adequate draining of the test volume.
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