ML20150E412
| ML20150E412 | |
| Person / Time | |
|---|---|
| Site: | 05000545 |
| Issue date: | 12/15/1978 |
| From: | James Anderson WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7812190140 | |
| Download: ML20150E412 (90) | |
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%. J stinghouse Electric Corporation Power Systems ewa systemsoivisoi Bcx355 l ht1hrgh Pennsylvania 15230 l
r~3 December 15, 1978 1
NS-TMA-2012 DOCKET NO. STN 50-545
^N Mr. Steven A. Varga, Chief i v
! Light Water Reactors, Branch No. 4 Division of Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission i Washington, D. C. 20555
SUBJECT:
Application for Two-Year Extension of the Preliminary Design Approval (PDA-7) for RESAR-3S
Dear Mr. Varga:
l Enclosed are sixty (60) copies of Amendment 14 to RESAR-3S, the Reference l Safety Analysis report documenting the Westinghouse 3411 MWt Nuclear Stram
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) Supply System. Amendment 14 is submitted in accordance with the Com-
'v' mission's August 22, 1978 policy statement on standardization which /
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l requires each application for a PDA extension to assess the design with respect to the Category I, II, and III matters approved since the regulatory requirements cutoff date for the PDA in question and the Category IV matters scheduled for review by the RRRC. Amendment 14 provides the required assessment for RESAR-3S and is in the form of a separate appendix. None of the existing material in RESAR-3S has been I modified.
Westinghouse requests a two-year extension of PDA-7, the Preliminary Design Approval for RESAR-3S, as provided by the Commission's policy statement.
/ If you have any questions or comments concerning this submittal or letter, l
we will be pleased to meet with you at your convenience.
l Very truly yours, l
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T. M. Anderson, Manager Nuclear Safety Department
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78121901%
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. STATE OF PENNSYLVANIA
,- 3 COUNTY OF ALLEGHENY T. M. Anderson, being duly sworn, states that he is Manager, Nuclear O
(,/ Safety Department, Water Reactor Divisions of the Westinghouse Electric Corporation; that he is authorized on the part of said Corporation to sign and file with the Nuclear Regulatory Commission this application and exhibits attached thereto; and that all such statements made and matters set.forth therein are true and correct to the best of his knowledge, information and belief.
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T. M.' Anderson '
Subscribed and sworn to me, a Notary Public in and for State and County above named, this /5' day of 2$<c,u/m,1978.
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RESAR-3S
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Ns AMENDMENT 14 INSTRUCTION SHEET The following instructional information and check list is being furnished to insert Amendment 14 into the RESAR-3S Reference Safety
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Analysis Report.
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Since in most cases the original RESAR-35 contains information printed on both sides of a sheet of paper, a new sheet is furnished to replace i sheets containing superseded material. As a result, the front or back l of a sheet may contain information that is merely reprinted rather than !
l f) changed. !
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Discard the old sheets and insert the new sheets, as listed below. l j Keep these instruction sheets in the front of Volume I to serve as a i record of changes. ]
i l Remove Insert l
(Front /Back) (Front /Back) l 3-v/3-vi 3-v/3-vi !
l 3-11/3-i11 3-ii/3-iii 3-ix 3-ix Appendix 3B should be inserted in RESAR-3S (
immediately following l Appendix 3A in Volume 1.
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, ~ RESAR-3S A14-1 AMENDMENT 14 l DECEMBER,1978 l
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TABLE OF CONTENTS (Continued)
_] Paae Section Title
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Vibration Operational Test Program 3.9-1 l 3.9.1.1
,-y 3.9.1.2 Dynamic Testing Procedures 3.9-2 )
l Dynamic Sys. tem Analysis Methods for j
- i. ,! 3.9.1.3 Reactor Internals 3.9-3 l 3.9.1.4 Correlation of Test and Analytical Results 3.9-7 3.9.1.5 Analysis Methods Under Loss of Coolant Accident Loadings 3.9-7 l 3.9.1.6 Analytical Methods for ASME Code Class 1 Components 3.9-10 ASME Coc e Class 2 and 3 Components 3.9-11 3.9.2 Plant Conditions and Design loading Combinations 3.9-11 3.9.2.1 Design Loading Combinations 3.9-11 3.9.2.2 Design Stress Limits 3.9 -11 a 3.9.2.3 4 3.9.2.4 Analytical and Emoirical Methods for Desian of Mechanical Equipment 3.9-12 y) 3.9.2.5 Design and Installation Criteria, Prusure-3.9-21 (
! Relieving Devices Stress Levels for Category I Components 3.9-23 3.9.2.6 Field Run Piping Systems 3.9-23 3.9.2.7 Class 2 and 3 Supports 3.9-23 3.9.2.8 3.9.3 ASME Code Classes CS Core Support Components and IS Internals Components 3.9-26 Faulted Conditions 3.9-27
- 3. 9. 3.1 3.9.3.2 Reactor Internals Response Under Blowdown and Seismic Excitation 3.9-28
() Acceptance Criteria 3.9-30 3.9.3.3 Methods of Analysis 3.9-31 3.9.3.4 Control Rod Drive Mechanisms 3.9-35 3.9.3.5
) 3.9-36
! / 3.9.4 References 1
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) RESAR-3S 3-v AMENDMENT 4 JANUARY.1976
TABLE OF CONTENTS (Continued)
Section Title Page 3.10 SEISMIC DESIGN OF CATEGORY I INSTRUMENTATION AND i
l ELECTRICAL EQUIPMENT 3.10-1 l 3.10.1 Seismic Design Criteria 3.10-1 3.10.2 Seismic Analysis, Testing Procedures and 8 Restraint Measures 3.10-3 3.10.3 References 3.10-5 3.11 ENVIRONMENTAL DESIGN OF MECHANICAL AND ELECTRICAL EQUIPMENT 3.11-1 3.11.1 Equipment Identification 3.11-1 3.11.2 Qualification Tests and Analyses 3.11-1 3.11.3 Qualification Test Results 3.11-2 3.11.4 Loss of Ventilation 3.11-2 2
3.11.5 References 3.11-2 4
APPENDIX 3A DISCUSSION OF REGULATORY GUIDES 3A-1 3A.1 References 3A-50 APPENDIX 3B EXTENSION REVIEW MATTERS FOR PRELIMINARY 38-1 DESIGN APPROVALS 34 3B.1 References 3B-78 O
O RESAR-35 3-vi AMENDMENT 14 DECEMBER,1978
LIST OF TABLES l'
Table Title Page 3.2-1 Equipment Code and Classification List 3.2-8
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3.5-1 Summary of Control Rod Drive Mechanism Missle Analysis 3.5-9 4
/' 3.5-2 Valve - Missile Characteristics 3.5-10 I-
~'ws 3.5-3 Piping Temperature Element Assembly-Missle Characteristics 3.5-11 3.5-4 Characteristics of other Missiles Postulated Within Reactor Containment 3.5-12 3.5-5 Missile Protection Interface Requirements 3.5-13 1
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3.6-1 RESAR-3S Fluid Systems Outside Containment 3.6-16 3.6-2 RESAR-35 Essential Fluid Systems Outside Containment 3.6-17 3.7-1 Damping Values Used for Seismic Systems Analysis for Westinghouse Supplied Equipment 3.7-36 3.9-1 Design loading Combinations for ASME Code Class 2 and 3 Components and Supports 3.9-37 (v")
3.9 2 Stress Criteria for Safety Related ASME Code Class 2 l4 and Class 3 Tanks 3.9-38
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3.9-3 Stress Criteria fer ASME Code Class 2 and Class 3 Inactive Pumps. 3.9-39
(^i 3.9-4 Stress Criteria for Safety Related ASME Code Class 2 l4 and Class 3 Values 3.9-40
- RESAR-3S 3-vii AMENDMENT 4 JANUARY, 1976
LIST OF TABLES (Continued)
Table Title Page 3.9-5 Stress Criteria For ASME Code Class 2 and 3 Piping 3.9-42 3.9-6 Design Criteria for Active Pumps 3.9-44 '
3.11-1 Class IE Equipment Located Inside Containment Required to be Environmentally Qualified in Accordance With WCAP-8587 (Reference 1). 3.11-3 3.11-2 Class IE Equipment Located Outside Containment Required to be Environmentally Qualified in Accordance ,
with WCAP-8587 (Reference 1). 3.11-4 8 3.11-3 Outside Containment Normal and Accident Environmental Qualification Conditions 3.11-5 3A-1 Differences Between NRC and Westinghouse Assumptions for NSSS Scope Specified in Regulatory Guide 1.25. 3A-52 3A-2 Tabular Products Within Westinghouse Scope Related to Regulatory Guide 1.66. 3A-54 38-1 Cross Reference Table - RESAR-3S to Standard Review Plan 3B-79 14 3B-2 Cross Reference Table - RESAR-35 to Standard Review Plan 38-80 0
RES AR-3S 3-viii AMENDMENT 14 DECEMBER,1978 J
LIST OF FIGURES Figure Title
, 3.6-1 Loss of Reactor Coolant Accident Boundary Limits 3.7-1 Horizontal Design Response Spectra - Scaled to 0.4g Horizontal Ground Acceleration 3.7-2 Maximum Floor Acceleration versus Fundamental Natural Frequency of the Building 3.7-3 Vertical Design Response Spectra - Scaled to 0.4g Horizontal Ground Acceleration 3.7-4 Multi-Degree of Freedom System 3.9-1 Westinghouse's Pump Bearing Vibration Limits Ccmpared to Industry Standards 3A-1 Results of Westinghouse Capsule Irradiations Tests 3A-2 Aluminum Corrosion in DBA Environment 3B-1 Comparison of Tensile Stress for Bolts 14 3B-2 Factor of Safety Against Failure Under Service Level D as a Function of T-S Ratio i
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RESAR-35 3-ix AMENDMENT 14 DECEf18ER,1978 1
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i RESAR-3S Amendment 14 (D
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APPENDIX 38 EXTENSION REVIEW MATTERS FOR PRELIMINARY DESIGN APPROVALS The Commission's August 22, 1978, policy statement on standardization (q 'j includes e provision which allows any Preliminary Design Approval (PDA) that had been previously issued for a three-year term to be extended for two additional years. This provision applies to PDA-7 issued for the RESAR-3S application on December 30, 1976, and when approved, will extend the PDA to December 31, 1981.
As set forth in the policy statement, each application for a PDA extension will be subject to an assessment of the design with respect to the Cate-gory I, II, and III matters approved since the regulatory requirement's CJtoff date for the PDA in question and the Category IV matters scheduled for review by the RRRC. A tabulation of each Category I, II, III, and IV matter approved or scheduled for RJC review since the regulatory requirement's cutoff date of October 30, 1975 for RESAR-35, is provided in the index tables which follow.
Appendix 3B addresses each matter identified by the index as being within Westinghouse scope of supply. Matters not within Westinghouse scope will be addressed in the applicant's Safety Analysis Report.
(VO As noted in Appendix 3A, throughout the text of RESAR-3S, commitments are made to comply with regulatory criteria, positions and guides. Compliance is based upon the Westinghouse interpretation of the statement of the requirement. Where the Westinghouse position differs from Westinghouse's understanding of the regulatory requirement, alternate positions are presented and defended as acceptable.
The regulatory requirement's cutoff date for RESAR-35 is October 30, 1975, which precedes the effective dates and implementation dates of all of the Westinghouse NSSS scope PDA extension review matters in Category I, with the exception of Regulatory Guide 1.92 Revision 1. Therefore, according to present NRC policy on standardization, RESAR-35 compliance is not required for any of the Category I matters except for Regulatory Guide 1.92 Revision 1. However, as indicated in the individual responses which follow, compliance or an acceptable alternative position can be demon-
[]m strated for all of the Westinghouse NSSS scope PDA extension review matters in Categories I, II, III and IV, without the necessity for imple-menting RESAR-35 design changes.
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INDEX CATEGORY I MATTERS APPROVED BY REGULATORY REQUIREMENTS 3
REVIEWCOMMITTEE(RCl-Effective W NSSS Applicant Item Reg. Guide Rev. Date Scope Scope 1 1.7 2 1/31/78 X 2 1.9 1 9/1/78 X 3 1.20 2 1/9/76 X 4 1.28 1 11/29/77 X !
5 1.29 3 6/20/78 X
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6 1.31 2 7/20/76 X 7 1.32 2 11/14/77 X 8 1.33 1 10/21/76 X 9 1.35 2 8/15/75 X 10 1.38 2 5/77 X 11 1.39 2 7/12/77 X l 12 1.52 2 11/29/77 X 13 1.63 1 3/22/77 X l
14 1.64 2 1/9/76 X 1 15 1.68 2 6/20/78 X X l 16 1.68.1 0 9/26/75 Not Applicable to PWRs 17 1.72 1 11/15/77 X 18 1.84 12 3/78 X l
19 1.85 12 3/78 X 20 1.90 1 5/26/77 X 1
21 1.92 1 8/22/75 X l
22 1.94 1 2/6/76 X l
' 23 1.95 1 10/21/76 X l 24 1.99 1 1/14/77 X See Cat. III Response l 25 1.100 1 6/14/77 X 26 1.103 1 10/76 X 27 1.106 1 1/28/77 X 28 1.107 1 10/21/76 X 29 1.116 0-R 5/77 X l 30 1.118 1 9/27/77 X 38-2
INDEX CATEGORY I MATTERS (Continued)
Effective W NSSS Applicant Item Reg. Guide Rev. Date Scope Scope I
A V 31 1.120 1 5/11/77 x 32 1.122 1 11/15/77 X-l 33 1.123 1 7/77 X e 34 1.126 0 1/14/77 X 35 1.128 1 6/20/78 X 36 1.129 0 2/18/77 X 37 1.131 0 5/26/77 X 38 1.132 0 5/11/77 X l 39 1.134 0 3/22/77 X l 40 1.135 0 7/12/77 X l 41 1.136 f 0 8/31/77. X l
'42 1.137 0 9/27/77 X p 43 NUREG-0102 0 9/27/77 X (SRP1.8) 44 1.138 0 11/15/77 X 45 1.XXX 0 11/15/77- X 46 1.140 0 11/29/77 X 47 1.142 0 1/31/78 X 48 8.19 0 3/14/78 X i
49 RSB 5-2 0 3/14/78 X See Cat. III Response O
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INDEX CATEGORY II MATTERS APPROVED BY REGULATORY REQUIREMENTS REVIEW COMMITTEE (R 3 g Effective W NSSS Applicant Item Reg. Guide Rev. Date Scope Scope 1 1.27 2 11/12/75 X 2 1.52 1 1/9/76 X 3 1.59 2 8/77 X ,
4 1.63 1 3/22/77 X 5 1.68.2 1 5/16/78 X 6 1.91 1 11/15/77 X 7 1.97 1 1/28/77 X 8 1.102 1 11/12/75 X 9 1.105 1 9/15/76 X 10 1.108 1 6/14/77 X 11 1.115 1 3/22/77 X 12 1.117 1 12/20/77 X 13 1.124 1 8/31/77 X 14 1.130 0 7/77 X 15 1.137 0 9/29/77 X 16 8.8 2 8/18/76 X 17 BTPASB 8/18/76 X 9.5-1 18 BTP 4/13/77 X MTEB 5-7 19 SRP 5.4.7 1 1/31/78 X See Cat. III Response 20 1.141 0 1/31/78 X See Cat. III Response O
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INDEX CATEGORY'III MATTERS APPROVED BY REGULATORY REQUIREMENTS 3
REVIEW COMMITTEE (R g Effective W NSSS Applicant item. ' Reg. Guide Rev. Date Scope Scope 1 1.56 1 5/16/78 Not Applicable to PWRs 2 1.68.2 1 5/16/78 X 3 1.99 1 1/14/77 X 4 1.101 1 3/77 X 5 1.114 1 11/76 X 6 1.121 0 5/11/76 X 7 1.127 1 11/29/77 X 8 1.137 0 9/27/77 X 9 SRP 5.4.7 1 1/31/78 X 10 1.141 0 1/31/78 X l
11 RSB 5-2 0 3/14/78 X O
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INDEX CATEGORY IV MATTERS A. REGULATORY GUIDES NOT CATEGORIZED Issue W NSSS Applicant Item Reg. Guide Rev. Date Scope Scope 1 1.13 1 12/75 X 2 1.14 1 8/75 X 3 1.75 1 1/75 X 4 1.79 1. 9/75 X 5 1.83 -1 7/75 X 6 1.89 0 11/74 X 7 1.93 0 12/74 X 8 1.104 0 2/76 X B. SRP CRITERIA SRP Implemen- W NSSS Applicant Item Branch Criteria tation Date Scope. Scope 1 MTEB 5.4.2.1 11/24/75 X 2 CSB 6.2.1 11/24/75 X 6.2.1A 6.2.1B 6.2.1.2 6.2.1.3 6.2.1.4 6.2.1.5 3 CSB 6.2.5 11/24/75 X 4 CSB 6.2.3 11 /24/75 x 5 CSB 6.2.4 11/24/75 X 6 ASB 9.1.4 11/24/75 X 7 ASB 10.4.9 11/24/75 X 8 SEB 3.5.3 11/24/75 X 3B-6
L INDEX CATEGORY IV MATTERS O B. SRP CRITERIA (Continued)
SRP Implementation W NSSS Applicant-5 Item Branch Criteria Date Scope Scope 9 SEB 3.7.1 11/24/75 X 10 SEB 3.7.2 11/24/75 X (9 11 SEB 3.7.3 11/24/75 X 12 SEB 3.8.1 11/24/75- X 13 SEB. 3.8.2 11/24/75 X 14 SEB 3.8.3 11/24/75 X 15 SEB 3.8.4 11/24/75 X 16 SEB 3.8.5 11/24/75 -X 17 SEB 3.7 11/24/75 X 11.2 11/24/75 11.3 11/24/75
[ 11.4 11/24/75 18 SEB 3.3.2 11/24/75 X 19 SEB 3.4.2 11/24/75 X 20 ASB 10.4.7 11/24/75 X 21 AB 4.4 11/24/75 X 22 RSB 5.2.5 11/24/75 X 23 RSB 3.2.2 11/24/75 X C. OTHER POSITIONS O
SRP Implementation W NSSS Applicant Item Branch Criteria Date Scope Scope fi 1 SEB 3.5.3 12/1/76 X
-2 SEB 3.7.1 8/1/76 X 3 SEB 3.8.1 4/1/76 X 3.8.2 4 SEB 3.8.4 9/1/76 X 5 SEB 3.5.3 10/1/76 X 6 RSB 6.3 6/1/77 X 38-7
I INDEX CATEGORY IV MATTERS O\
C. OTHER POSITIONS (Continued)
SRP Implementation W NSSS Applicant Item Branch Criteria Date Scope Scope 7 RSB 6.3 9/1/77 X 8 RSB 15.1.5 4/1/77 X 9 RSB 5.4.6 12/1/77 X 5.4.7 6.3 10 RSB 3.5.1 3/28/78 X 11 AB 4.4 1/1/77 X 12' PSB 8.3 1/1/78 X 13 CSB 6.2.1.2 6/1/76 X 14 CSB 6.2.6 9/1/77 X 15 CSB 6.2.1.4 1/1/77 X.
16 ASB 3.6.1 11/1/77 X 3.6.2 17 ASB 9.2.2 1/1/77 X 18 ASB 10.4.7 8/1/76 X 19 ICSB 3.11 1/1/76 X O
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Category I Item i' RG 1.7 Rev. 2 Control of Combustible Gas Concentrations in !
1/31/78 Containment Following a Loss-of-Coolant l Accident
RESPONSE
O y/ Calculations for post LOCA hydrogen analysis in RESAR 3S Section 15.4.1.2 are in compliance with Regulatory Guide 1.7 Rev. 1. 'The hydrogen production rates resulting from corrosion and radiolysis are calculated according to methods and utilizing parameters, given in the guide. Compliance with RG 1.7 Rev. 2 will be calculated when the r revised guide is issued. However, because the Regulatory Requirement's (3 cutoff date for RESAR-3S precedes 1/31/78, compliance with Rev.~-1 of the guide is acceptable.
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Category I Item RG 1.20 Rev. 2 Comprehensive Vibration Assessment Program 1/9/76 for Reactor Internals During Preoperational and Initial Startup Testing The extent to which the requirements in Regulatory Guide 1.20 Rev. 2 are satisfied for Reactor' Internals is discussed in Section 3.9 of RESAR 3S.
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4-- - as, Category I Item RG 1.28 Rev. 1 Quality Assurance Program Requirements l 11/29/77 (Design and Construction) l l
RESPONSE !
The Wes) gghouse Quality Assurapqq Programs, as described in WCAP-8370- (
Rev. 8AL .J and WCAP-7800 Rev. 5L d), satisfy the requirements of l Regulatory Guide 1.28 Rev. O, which contains requirements similar to' those in Regulatory Guide 1.28 Rev.1.
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i Category I Item RG 1.29 Rev. 3 Seismic Design Classification el 6/20/78
RESPONSE
The position described in Appendix 3A to RESAR 3S for Regulatory Guide i 1.29 Rev.1 is also applicable f or Reguatory Guide 1.29 Rev. 3. l e
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Category I
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V Item RG 1.31 Rev. 2 Control of Ferrite Content in Stainless Steel Weld Metal I s RESPONSE
' Regulatory Guide 1.31, Revision 2, Control of Ferrite Conterit in Stain-less Steel Weld Metal, describes a method for implementing General Design Criteria 1 of Appendix A 10CFR Part 50 and Appendix B 10CFR Part 50 with regard to control of welding austenitic stainless steel com-ponents and systems. The following paragraphs discuss the method to be O, used by Westinghouse to control delta ferrite in austenitic stainless steel welding; this method is in compliance with Revision 2 of the guide.
The welding of austenitic stainless steel is controlled to mitigate the occurrence of microfissuring or hot cracking in the weld. Although published data and experience have not confirmed that fissuring is detrimental to the quality of the weld, it is recognized that such fissuring is undesirable in a general sense. Also, it has been well documented in the technical literature that the presence of delta ferrite is one of the mechanisms for reducing the susceptibility of stainless steel welds to hot cracking. Available data indicates that a minimum delta f errite level (expressed in Ferrite Number (FN)), above which the weld metals commonly used by Westinghouse will not'be prone to G hot cracking, lies somewhere between 0 FN and 3 FN.
(d The scope of these controls discussed herein encompasses welding pro-cesses used to join stainless steel parts in components designed, f abricated or stamped in accordance with ASME B&PV Code,Section III Class 1, 2, and CS components. Delta ferrite control is appropriate for the above welding regirements except where no filler metal is used or for other reasons such control is not applicable. These exceptions include electron beam welding, autogenous gas shielded tungsten arc welding, explosive welding, and welding using fully austenitic welding materials.
Westinghouse components are fabricated utilizing welding procedures p qualified in accordance with ASME Code Section III; also delta _ ferrite g content verification is required for welding materials used for welding l
qualification testing and for each welding process used in the produc-tion of austenitic stainless steel components. Specifically, undiluted weld deposits of the " starting" welding materials are required to con-tain a minimum delta ferrite level of 5 FN. The ASME Code permits the p use of either a chemical analysis method or a magnetic measurement method to determine the delta ferrite content; however, in the fabrica-Q tion of Westinghouse components, Ferrite-Number is measured on an as-deposited weld pad using a calibrated magnetic measuring device, as recommended by Revision 2 of Regulatory Guide 1.31.
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Category I O
Item RG 1.38 Rev. 2 Quality Assurance Requirements for Packaging, 5/77 Shipping, Receiving, Storage, and Handling of Items for Water-Cooled Nuclear Power Plants l RESPONSE The Westinghouse position on compliance y Rev. 2 is presented in WCAP-8370 Rev. 8ALWCAP-7800 J and {th Regulatory Rev. SL Guide 1.dg3 O
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Category'I.
O Item RG 1.64 Rev. 2 Quality Assurance Requirements for the Design 1/9/76 of Nuclear Power Plants
RESPONSE
' Rev.
The 2Westinghouse position onRev. compliance $h Regulatory y{J and WCAP-7800 Guide 1,64 Rev. SL d.
is presented in WCAP-8370 8AL O
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Categ1ry I Item RG 1.68 Rev. 2 Initial Test Programs for Water-Cooled 9/15/76 Reactor Power Plants l
RESPONSE I Although RG 1.68 Rev. 2 is not within Westinghouse responsibility, but rather the Applicant's, the regulatory guide requirements were considered in the formation of Westinghouse ~ procedures. Westinghouse does not take exception to the guide and is basically in compliance with it's requirements.
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' Item -6 Code Case Acceptability - ASME Section.III'
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RG 1.84 Rev.l12 l ..
3/78 Design and Fabrication t
, RESPONSE
- 1. Westinghouse controls its suppliers to:
- a. , Limit the'use of code-cases to those_ listed in Regulatory' ~
Position:C.1 of the Regulatory Guide.1.84 and l.85 revision in-1 effect at the time the equipment is ordered, except as allowed' j 3 in; item 2 below,
- b. Identify and. request permission for use of any code cases not E listed in Regulatory, Position C.1 of the Regulatory Guide 1,84 and 1.85 revision in effect at the time .the equipment is 'l ordered, where use of such code cases is needed by.the supplier. j 1
- c. Permit continued use of a code ~ case considered acceptable at the' time of equipment order, where such code case was subsequently-annulled'or amended.
-2. _ Westinghouse seeks NRC permission =for the use of code cases needed by: suppliers and not yet endorsed in Regulatory Position C.1' of the Regulatory Guide-1.84 and'1.85 revision.in.effect-at the time the~
'l equipment is ordered and permits supplier use only if NRC permission is obtained or -is' otherwise assured (e.g.,: a later version of the regulatory guide includes endorsement).
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Category 1 Item RG 1.85 Rev. 12 Code Case Acceptability - ASME Section III 3/78 Materials
RESPONSE
See response ti RG 1.84, above.
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Category I ,
I O Item RG 1.92 Rev. 1 Combining Modal Response and Spatial Com-8/22/75 ponents in Seismic Response Analysis
RESPONSE
The Westinghouse procedure for combining modal responses is presented in RESAR-3S' Section 3.7.3.4. This procedure is considered an acceptable alternative to RG 1.92 Rev. 1.
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Category I Item RG 1.100 Rev. 1 Seismic Qualification of Electric Equipment 6/14/77 for Nuclear Power Plants
RESPONSE
The Westinghouse program for seismic qualification of safety related electrical equipment to Regulatory Guide 1.100 is delineated in the latest revision of WCAP-8587 [3], " Methodology for Qualifying Westinghouse PWR-SD Supplied NSSS Safety Related Electrical Equipment,"
together with Supplement 1 to this report. In summary, seismic qualification will be demonstrated by the following methods:
- 1. For equipment not subject to high energy line break conditions which has been previously qualified, as identified in Supplement 1 to WCAP-8587, using the methods permitted by the 1971 version of IEEE Standard 344 (i.e., single axis sine-beat testing or analysis, af ter demonstration of no resonant frequency below 33 Hz), no additional seismic qualification will be specified, provided that:
- a. It can be shown by separate component testing and/or analysis that there are no aging mechanisms that could prejudice the previously completed seismic qualification,
- b. Any design modifications made to the equipment do not significantly affect the seismic characteristics of the equipment.
- c. The adequacy of the original seismic test levels can be demonstrated as conservative by plant specific verification.
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- 2. For new equipment, or equipment that cannot meet the provisions of 1), above, seismic qualification will be performed in accordance with IEEE Standard 344-75. The method to be employed (i.e., test end/or analysis) is indicated, for the safety related equipment in the Westinghouse PWRSD Scope of Supply, in Supplement 1 to l WCAP-8587. Where multifrequency biaxial inputs are employed for testing, the methodology described in WCAP-8695[4), " General M3thod of Developing Multifrequency Biaxial Test Inputs for Bistables," will be employed. When flexible equipment size and l weight precludes biaxial testing (e.g., hydrogen recombiner, l enclosures), single axis testing with justification will be utilized to meet IEEE Strndard-344 1975. For rigid equipment (i.e., no resonant frequency below 33 Hz), qualification will be by analysis in accordance with IEEE Standard-344 1975.
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p Category I Item RG 1.118 Rev. 1 Periodic Testing of Electric Power and 9/27/77 Protection Systems
/ RESPONSE ISSUE:
Regulatory Guide 1.118 endorses the use of IEEE-338-1975 as an accept-able method for periodic testing of electric power and protection systems, but supplements the IEEE requirements ("shall" and "must") with
(,,}
% the inclusion of recommendations ("should") and further technical con-siderations not included in the standard.
POSITION:
Westinghouse will treat all "should" statements in IEEE-338-1975 as recommendations to be followed only at its discretion. Detailed posi-tions on the regulatory positions are presented below:
- 1. Regulatory Position C1 Westinghouse will provide a means to facilitate response time testing A from the sensor input at the protection rack to and including the d input to the actuation device. Examples of actuation devices are the protection system relay or bistable.
- 2. Regulatory Position C2 Westinghouse defines " Protective Action Systems" to mean the ele'ctric, instrumentation and controls portions of those protection systems and equipment acteated and control by the protection system.
3 Regulatory Position C6 Equipment performing control functions, but actuated from protection system ser,, ors, is not part of the safety system and will not be tested for time response.
- 4. Regulatory Position C10 Testing will not be tied to accident conditions, but only to the j range of the parameter that is varied.
i L 5. Regulatory Position C11 Status, annunciating, display, and monitoring functions, except for those related to the Post Accident Monitoring System (PAMS) are con-sidered by Westinghouse to be control functions. Reasonability ,
/m checks, i.e., comparison between or among similar such display b) functions, will be made. Otherwise the clarification noted in item 3 above pertainina to Position C6 is observed.
1 3B-21
- 6. Regulatory Positions 12 and 13 Response time testing for control functions operated from protection system sensors will not be performed. Nuclear Instrumentation System detectors will not be tested for time response (see Table 3.3-2, Page 3/4 3-11 of STS). The " expected environmental and mechanical con-figuration of the actual installation" will not be duplicated for the testing of process sensors which must be removed to accomplish response time testing unless it can be shown that the duplication is oractical and that the duplicated factors significantly influence the sensor time response. The Westinghouse-scope protection system does not preclude the response time testing of process senscrs by their removal at normal shutdown. The standard Westinghouse-scope protec-tion system does '10t include design provision which permit insitu testing of proces; or Nuclear Instrumentation System sensors.
- 7. Regulatory Positian 14 Tenporary jumper wires, temporary test instrumentation, the removal of fuses and other equipment not hard-wired into the protection system will be used where applicable.
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_C_ategory I' O Item RG 1.123 Rev. 1 Quality Assurance Requirements for Control 7/77 of Procurement of Items and Services f or Nuclear Power Plants
RESPONSE
The Westinghouse position on compliance h Regulatory Guide 1.123 R 1 is presented in WCAP-8370 Rev. 8A and in WCAP-7800 Rev.
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Category I Item RG 1.126 Rev. O An Acceptable Model and Related 1/14/77 Statistical Methods for the Analysis of Fuel Densification As noted in the discussion in Regulatory Guide 1.126, vendors may utilize densification models other than that noted in the guide, if these models have received NRC approval. As such, Westin its own densification model as outlined in WCAP-8218[5]Proprietary)
(ghouse utilizes and approved by the NRC.
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Category I O Item NUREG-0102 SRP 1.8 Interfaces for Standard Designs 9/27/77 Rev. 0-
RESPONSE
s RESAR 35 addresses interfaces {n general in Section 1.7. In Section 1.7, an index of acceptable interface information is provided for the balance-of-plant designs, and the applicable interf aces of NUREG-0102 are identified.
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l Category I Item .
O RG 8.19 Rev. 0 Occupational Radiation Dose Assessment'at 3/14/78 LWRs - Design Stage Man-Rem Escimates -
RESPONSE l RESAR 3S does not address Regulatory Guide 8.19. Information needed to address this regulatory guide will be provided in the safety. analysis ,
reports referencing the RESAR 35 design.
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Item RG.1.97 Rev. 1 Instrumentation for Light-Water-Cooled 1/28/77 Nuclear Power Plants to Assess Plant Conditions During and Following an Accident
RESPONSE
The Westinghouse design is in agreement with the reguletory positions of l Regulatory Guide 1.97, Revision 1, with the following exceptions:
- 1. Regulatory Position C.l.
- a. Westinghouse will provide Post Accident Monitoring instrumenta-tion to monitor key Reactor Coolant System parameters, contain-ment conditions, and the effectiveness of the Engineered Safety Features System. The instrumentation provided will provide the operator with information to enable him to perform required manual safety functions and to determine the effect of normal safety actions taken following a reactor trip due to a Condition II, I'I or IV event.
- b. Instrumentation identified in Battelle-Columbus Laboratories Report BMI-X-647, April 9, 1973, with the exception of that listed in 1.a. above, will not be provided.
i V 2. Regulatory Position C.3
- a. Westinghouse does not supply instrumentation to satisfy position C.3. The delineated parameters in position C.3 extend far beyond the worst case values following SAR, Chapter 15 Design Bases Events.
- b. Post Accident Monitoring instrumentation will be supplied as delineated in item 1.a above. Westinghouse believes that posi-tion C.3 should be deleted or modified to maximum range corre-sponding to worst case conditions. For example, the range for containment pressure is typically 115% of the plant's contain-ment design pressure which is extended to a range that bounds S the SAR containment integrity analysis.
- 3. Regulatory Position C.4 Post Accident Monitoring instrumentation will be qualified by implementation of the final NRC staff approved version of WCAP-8587.[3]
O- 4. Regulatory Position C 5
- a. Westinghouse will provide recorder 3 for certain accident monitoring channels.
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- b. Of those parameters selected to provide transient or trend information to the operator, at least one of the redundant accident monitoring channels is recorded. Th'e recorder is not redundant, does not meet the single-failure criterion, does not have its own isolation amplifier (the incoming signal will already be isolated from the accident monitoring channel) and may have multiple pens to permit more than one channel to be -
recorded. The equipment in the generic environmental and seismic qualification program includes these recorders. These recorders will not be qualified to function during the pos-tulated seismic event. Following the event, the recorders will regain an operating status.
- 5. Implementation The provisions of this guide will be implemented by Westinghouse with the exceptions noted above.
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Category II O
'd Item RG 1.105 Rev. 1 Instrument Setpoints 9/15/76
RESPONSE
Westinghouse technical specifications provide the margin from the nominal setpoint to the technical specification limit to account for drif t when measured at the rack during periodic testing. The allowances between the technical specification limit and the safety limit include the following items: a) the inaccuracy of the instrument, b)
O measurement accuracy, c) uncertainties in the calibration, d) process.the poten-L v s tial transient overshoot determined in the accident analyses (this may include compensation for the dynamic effect) and e) environmental effects on equipment accuracy caused by postulated or limiting postu-lated events (only for those systems-required to mitigate consequences of an accident). Westinghouse designers choose setpoints such that the accuracy of the instrument is adequate to meet the assumptions of the safety analysis.
The range of instruments is chosen based on the span necessary for the instrument's function. Narrow range instruments will be used where necessary. Instruments will be selected based on expected environmental and accident conditions. The need for qualification testing will be evaluated and justified on a case basis.
\ Administrative procedures coupled with the present cabinet alarms and/or locks provide sufficient control over the setpoint adjustment mechanism such that no integral setpoint securing device is required. Integral setpoint locking devices will not be supplied.
The assumptions used in selecting the setpoint values in Regulatory Position C.1 and the minimum margin with respect to the technical speci-fication limit and calibration uncertainty will be documented by Westinghouse. Drift rates and their relationship to testing intervals '
will not be documented by Westinghouse.
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Category II Item RG 1.124 Rev. 1 Service Limits and Loading Combinations 8/31/77 for Class 1 Linear Type Component Supports Resp 0NSE
- 1. The Regulatory Guide states in paragraph B.1(b): " Allowable service limits for bolted connections are derived from tensile and shear stress limits and their study of three interaction curves of allow-able tension and shear stress based on the ASME Code (emergency condition allowables per XVII-2110 and faulted condition allowables per F-1370) and the ultimate tensile and shear strength of bolts (obtained from experimental work published by E. Chesson, Jr., N. L.
Faustino, and W. H. Munse, "high Strength Boits Subjected to Tension and Shear," Journal of the Structural Division, Proceedings of the American Society of Civil Engineers, October 1965, Pages 155-180) indicates that there is adequate safety margin between the emergency and f aulted condition allowables and f ailure of the bolts.
During their tests to determine the strength and behavior character-istics of single high strength bolts subjected to various combina-tions of tension and shear (T-S), Chesson, et. al. used a total of 115 bolts to ASTM specification A315-61T and A354-Grade BC. The A325-61T, which is a medium carbon steel, had a yield point of 77000 psi to 88000 psi and ultimate strength of 105000 psi to 120000 psi, dependin~g upon the bolt diameter. The A354-Grade BC, which is a heat treated carbon steel, had a yield point of 99000 psi to 109000 psi and ultimate strength from 115000 psi to 125000 psi, depending upon the bolt diameter.
Figure 38-1 shows the interaction curves for T-S loads on SA325 bolts. Curve (1) represents the interaction relation (ellipse) permitted by Code Case 1644 (ASME III Appendix XVII Winter 77 Addenda) for service levels A, B and design condition. Curve (2) represents the interaction curve which considers the Code Case 1644 allowables and the increase permitted by XVII-2110(a) for service level C. Curve (3) represents the interaction curve which considers the Code Ca;e 1644 allowables and the increase permitted by F-1370(a) far service level D. Curve (3) is the upper limit of the allowable s tresses.
The design stress limits represented by Curves 1, 2, and 3 for A325 bolts are then compared against the ultimate strength of the bolts represented by Curve 4, which is based on Chesson's test results.
The area between Curve 3 and Curve 4 is the safety margin between the maximum bolt stress under service level D and minimum ultimate strength of the bolt.
O 3B-30
Factor of safety against failure for A325 ' bolts for various T-S
. ratios.is shown:in Figure 38-2. ~The safety factor varies between.a.
minimum of 1.36 and-a maximum of 2.29 depending.upon the value of l
O T-S - rati o. This is based upon,the ultimate strength of the' bolts-f rom Chesson's: test and' the allowables obtained from Code Case 1644 l and the increase permitted by F-1370(a) for service level D. Figure L 38-2 demonstrates'that there exists an adequate factor of safety for the complete: range of T-S loadings.
From this study 'it is' observed that:
l (1) For the_ emergency condition, the safety f actor. (ratio of ulti--
- mate strength to allowable stress) varies between a minimum of-
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l 1.63 and a maximum of 2.73 depending upon the actual tensile stress / shear stress (T/S) ratio on the bolt.
(2) For the f ault'ed. condition, the safety f actor varies between'a' minimum of 1.36 to a maximum of 2.29, again depending upon actual T/S' ratio on-the bolt.
It is thus reasonable to allow an increase in these limits for the emergency and f aulted conditions.
Based on the above discussion for the emergency and faulted condi-tions, Westinghouse will use allowable bolt stresses specified in Code Case 1644-6, as increased according to the provisions of XVII-2110(a) -and F-1370(a), respectively.
.\.sr] 2. The increased design limit for the stress range identified in NF-3231.1(a) shall be limited to the smaller of 2 Sy or Su unless otherwise justified by shakedown analysis.
- 3. .In paragraphs B.5 and C.8 of the Regulatory Guide, Westinghouse I takes exception to the requirement that systems whose safety-related function occurs during emergency or faulted plant conditions must meet level B limits. The reduction of allowable stresses to no greater than level B limits-(which in reality are design limits since design level A and level B limits are the same for linear supports) for support structures in those systems with safety related functions occurring during emergency or f aulted plant condi-tions is overly conservative. The primary concern is that the
~
system remains capable of performing its safety function. For O active components, this is accomplished through the operability program as discussed in Section 3.9.2.4. In the case of Class 1 j
piping, maintaining the pipe stresses within level D limits assures that piping geometry is maintained and that required flow is not impeded. The selection of more restrictive stress limits for com-ponent supports is not necessary to assure the functional capability O of the system. i O
38-31 l
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- 4. Paragraph C.4 of-the Regulatory Guide states: "However, all increases (i.e., those allowed by NF-3231.1(a), XVII-2110(a), and F-1370(a)) should always be limited by XVII-2110(b) of Section III". Paragraph XVII-2110(b) specifies th member compressive axial loads shall be limited to 2/3 of critical buckling.
In the design of component supports, member compressive axial loads shall be limited to 0.67 times the critical buckling strength. If, as a result of more detailed evaluation of the supports the member i cortpressive axial loads can be shown to safety exceed 0.67 times the l critical buckling strength for the faulted condition, verification l of the support functional adequacy will be documented and submitted ,
to the NRC for review. The member compressive axial loads will not exceed 0.67 times the critical buckling strength without NRC accept- l ance. In no case shall the compressive load exceed 0.9 times the critical buckling strength.
- 5. Paragraph C.4 of the Regulatory Guide states that increases in Level A or B service limits does not apply to limits for bolted connec-tions. The Westinghouse design of component supports restricts the use of bolting material to the following applications:
- a. Westinghouse design uses bolting predominantly in tension.
Oversized holes are generally provided and a mechanism other than the bolts is provided to take any shear loads. Shear er shear & tension interaction occur only in isolated locations.
- b. Westinghouse bolts are limited to the following material A490, SA-354, SA-325, SA-540.
- c. The diameters used range between 1/2" and 3".
These limitations on bolt usage are standard in the Westinghouse supports. We will limit tensile loads in the bolts to 0.7 Su, but not to exceed in any case 0.9 Sy. The allowables are taken at tempera ture. In those few cases where bolts are used in shear or tension and shear, ASME Code Appendix XVII - 2460 Requirements will apply with an increase factor that is defined in Regulatory Guide 1.124 or in Appendix F-1370, whichever is more restrictive. This provides an adequate margin of safety for the Westinghouse design.
If future revisions to the bolting criteria in ASME Section III modify the Westinghouse criteria listed above, we will review the criteria at the time.
- 6. Paragraph C.6(a) of the Regulatory Guide appears confusing as to I what stress limits may be increased for the emergency condition.
Westinghouse will interpret this. paragraph as follows: "The stress limits of XVII-2000 of Section 111 and Regulatory Position 3 increased according to the provisions of XVII-2110(a) of Section III and Regulatory Position 4 should not be exceeded for component sup-ports designed by the linear elastic analysis method."
O 38-32
- 7. The method described in Paragraph C.7(b) of the Regulatory Guide is overly conservative'and inconsistent with the stress limits e presented in Appendix F. Westinghouse will use the provisions of F-1370(d) to determine service level D allowable loads for supports
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l designed by the load rating method. If future revisions to Appendix F modify thi criteria, it will be- reviewed further. If the load rating method is used, further details of its implementation will be provided at that time, t
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Category II Item RG 1.130 Rev. O Design Limits and Loading Combinations 7/77 for Class 1 Plate- and Shell-Type Component Supports
RESPONSE
- 1. Westinghouse will use the latest revision of Code Case 1644 as approved by Regulatory Guide 1.85.
- 2. Paragraph.B.1 states that increases are not allowed for bolted con-nections for emergency and f aulted conditions. The Westinghouse position is that it is reasonable to allow an increase in the limits for bolted connections for these conditions. Further justification concerning this position can be found in Item 1 of the discussion on Regulatory Guide 1.124.
- 3. Paragraphs C.3, C.4(a), and C.b(a) state that the allowable buckling strength should be calculated using a design margin of 2 for flat plates and 3 for shells for normal, upset, and emergency conditions.
In the design of plate-type supports, merrber compressive axial loads shall be limited per the requirements of Paragraph C.3 for normal upset, and emergency conditions. There are no Class 2 shell-type supports in the Westinghouse NSSS.
- 4. In paragraph C.7, the inclusion of the upset plant condition in his load combination is inappropriate. The upset plant conditions are properly considered in paragraph C.4.
- 5. Paragraph C.7(a) references the criterion presented in F-1370(c),
which states: " ... loads should not exceed 0.67 times the critical buckling strength of the support...".
In the design of plate-type component supports, member compressive axial loads shall be limited to 0.67 times the critical buckling strength. If, as a result of more detailed evaluation of the sup-ports the member compressive axial loads can be shown to safely exceed 0.67 times the critical buckling strength for the faulted condition, verification of the support functional adequacy will be documented and submitted to the NRC for review. The member compres-sive axial loads will not exceed 0.67 times the critical buckling strength without NRC acceptance. The Westinghouse NSSS has no Class 1 shell-type supports.
- 6. The method described in paragraph C.7(b) of the Regulatory Guide is overly conservative and inconsistent with the stress limits pre-sented in Appendix F. Westinghouse will use the provisions of F-1370(d) to determine service level D allowable loads for support designed by the load rating method.
38-34
Category II Item
- v RG 8.8 Rev. 2 Information Relevant.to Ensuring that Occu-8/18/76 pational Radiation. Exposures at Nuclear Power Stations will be as Low as Is Reasonably Achievable (Nuclear Power Reactors)
(-)'
D RESPONSE RESAR'3S does not. address Regulatory Guide 8.8 Rev. 2. However, the' required information to address this regulatory guide is contained in a topical Westinghouse report, .WCAP 8872 [6], " Design, Inspr; tion, Opera-(q tion and Maintenance Aspects of the Westinghouse NSSS to Maintain Occu-pational Exposures As Low As Reasonably Achievable", April 1977. The.
'information in this report will be included in safety analysis reports referencing the RESAR-35 design. l I
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Category III Item RG 1.99 Rev. 1 Effects of Residual Elements on Predicted 9/15/76 Radiation Damage to Reactor Vessel Materials
RESPONSE
Justification of the Westinghouse position on Rev. O and Rev. 1 of the Guide is detailed in references [7]'and [8] respectively.
In summary, Rev. 1 of the Guide is substantially identical with Rev. O, with minor clarifications and inclusion of a new position C.2, which had previously been included in the Discussion section of Rev. O.
The Westinghouse letter of comment on Rev. I reiterates the comments of Rev. O and includes further clarification of hardship imposed by the Guide with respect to vessel material.
The Westinghouse position with respect to each of the Guide positions is as follows:
- 1. The basis as well as the scope of the Guide .for predicting adjust-ment of reference temperature as given in Regulatory Position C.1 are inappropriate since the data base used was incomplete and included some. data which were not applicable.
- 2. Westinghouse is in agreement with the Guide Position C.2a. However, with respect to Guide Position C.2b, Westinghouse believes that Figure 2 of the Guide is incorrect since the upper shelf energy for six-inch thick ASTM A302B reference correlation monitor material reported by Hawthorne ind'icates ssentially a constant upper shelf at fluences above #1 x 10b n/cm . [8]
- 3. The Westinghouse position with reference to the Guide Position C.3, controlling residual elements to levels that result in a predicted adjusted reference temperature of less than 2000F at end-of-life, is that the stresses in the vessel can be limited during operation in order to comply with the requirements of Appendix G to 10CFR Part 50 even though the end-of-life adjusted reference temperature may exceed 2000F. By applying the procedures of Appendix G to ASME Section III, the stress limits incluaing appropriate Code safety margin can be met.
- 4. Recent surveillance capsule data frgm the Point Beach and Connecticut Yankee reactor vessels L 9 3 indicate a steady state condition of irradiation damage due to the annealing effect at operating temperature. As an alternative to R.G. 1.99, operating limits for Westinghouse plants will be determined by using the cur-rent radiation damage curves developed by Westinghouse [10]. It is expected that, as more surveillance capsule data is accumulated, both the R.G. 1.99 and Westinghouse damage curves will prove to be overly conservative.
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l Category III l O
g Item RG 1.121 Rev. 0 Bases for Plugging Degraded PWR Steam 5/11/76 Generator Tubes 1
RESPONFE f n
- g Position C.1
)
Westinghouse interpr ets the term " Unacceptable defects" to apply to those imperfections resulting from service induced mechanical or chem-ical degradation of the tube walls which have penetrated to a depth in excess of the Plugging Limit.
Positions C.2.a.(2) and C.2.a(4)
Westinghouse has documented its opinions on Reg. Guide 1.121 by corpo-rate letter and has identified as the major exception the margin of 3 against tube failure for normal operation. Westinghouse defines tube failure as plastic deformation of a crack to the extent that the sides of the crack open to a non-parallel, elliptical configuration. The tubing can sustain added internal pressure beyond those values before reaching a condition of gross failure. We have interpreted this to apply as an operating limit for the plant and consider that it intro-duces a conflict to the established conditions for plant operation as identified in the plant tech specs. A factor of 3 is quite often used O
V in ASME Code Design guidelines. These Code practices apply to the design.of hardware and to the analyses done on these designs. Condi-tions which occur during operation of the equipment and which may affect the equipment so that design values no longer apply, are not directly addressed by-the initial Code requirements. That is one reason why plant tech specs have been generated to establish safe Hmits of opera-tion for power station equipment. The ASME Code is not applicable to the operational criteria of steam generator tubing. Our tubing design and tubing in the design condition has margins in excess of 3. In sum-mary, we satisfy the margin of 3 if it were used in a Code sense as new equipment design. Moreover, we do not believe that this margin should be utilized as a limiting' conditions for normal operation.
p Position C.2.b In cases where sufficient inspection data exists to establish a degrada-tion allowance, the rate used will be an average time-rate deterrrined from the mean of the test data.
Positiun C.3.d(1) and C.3.d.(3) p)
(^ The combined effect of these requirements would be to establish a maxi- ,
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mum permissable primary-to-secondary leak rate which may be below the 10 V
threshold of detection with current methods of measurement. Westing-house has determined the maximum acceptable length of a through-well-crack based on secondary pipe break accident loadings which are t.,>.:cally twice the magnitude of normal operation pressure loads.
Westinghouse will use a leak rate associated with the crack size deter-mined on the basis of accident loadings.
Position C.3.e.(6)
Westinghouse will supply computer code names and references rather the,n the actual codes.
Position C.3.f.(1)
Westinghouse will establish a minimum acceptable tube wall thickness (Plugging Limit) based on structural requirements and consideration of loadings, measurement accuracy and, where applicable, a degradation allowance as discussed in this position and in accordance with the general intent of this guide. Analyses to determine the maximum accept-able number of tube failures during a postulated condition are normally-done to entirely different bases and criteria are not within the scope
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of this guide.
Position C.3.f.(4)
Where requirement ~ ' minimum wall are markedly different for different areas of the tube .;1e, e.g., U-bend area versus straight length in Westinghouse designs, two plugging limits may be established to address the varying requirements in a manner which will not require unnecessary plugging of tubes.
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Category III-n)(
Item SRP 5.4.7 Rev. 1 Residual Heat Removal System 1/31/78
RESPONSE
A)
( Based on SRP 5.4.7 and Brane,h Technical Position RSB 5-1, the following technical' requirements are applicable to RESAR 3S plants:
- 1. Provide safety-grade steam generator dump valves, operators, air and power supplies, which meet the single f ailure criterion.
(3 2. Provide the capability to cooldown to cold shutdown in less than 36
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hours assuming the most 1.imiting single failure and loss of offsite power or show that manual actions inside or outside containment or return to hot standby until the manual actions or maintenance can be performed to correct the f ailure provides an acceptable alternative.
- 3. Provide the . capability to depressurize the reactor coolant system with only safety-grade systems assuming a single f ailure and loss of offsite power or show that manual actions inside or outside contain-ment or remaining 'at hot standby until manual actions or repairs are complete provides an acceptable alternative.
- 4. Provide the capability for borating with only safety-grade systems i,T assuming a single failure and loss of offsite power or show that V manual actions inside or outside containment or remaining at hot standby until manual action or repairs are completed provides an acceptable alternative.
- 5. Provide the system and component design features necessary for the prototype testing of both the mixing of the added borated water and the cooldown under natural circulation conditions with and without a single failure of a steam generator atmospheric dump valve. These tests and analyses will be used to obtain information on cooldown -
times and the corresponding AFW requirements,
- 6. Commit to providing specific procedures for cooling down using natural circulation and submit a summary of these procedures.
p
'7 . Provide or require a seismic Category I AFW supply for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> at Hot Shutdown plus cooldown to the DHR system cut-in based on the longest time (for only onsite or offsite power and assuming the worst single f ailure), or show that an adequate alternate seismic Category I source will be available.
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The safe shutdown design basis for all Westinghouse pressurized water reactors is hot standby. Following any Condition II, III, or IV event including loss of offsite power, RESAR 3S plants can be placed in and maintained in, for an extended period of time, a safe hot standby con-dition using safety grade systems only. In this condition, decay heat removal is via the auxiliary feedwater system and the steam generator safety valves. Westinghouse recormlends that the plant be maintained in the safe hot standby condition following a Condition II, III, or IV event. However, Westinghouse pressurized water reactors are capable of being taken to cold shutdown, if required, provided that restrictions are not placed on operator manual actions.
The technical requirements of BTP RSB 5-1 are addressed as follows:
- 1. Compliance is not required since the plant can be maintained in a safe hot standby condition while any required manual actions are taken. One safety grade steam generator power operated relief valve is provided for each of the four steam generators. Safety grade remote operators and power supplies are not required since het standby can be achieved and maintained using the safety grade steam generator safety valves. The steam generator power operated relief valves are provided with handwheels and can be operated locally to permit plant cooldown.
- 2. Compliance is not required since the plant can be maintained in a safe hot standby condition while any required manual actions are taken. The plant is capable of reaching RHR initiation conditions in approximately 36 to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, including the time required to perform any manual actions.
- 3. Compliance is not required since the plant can be maintained in a safe hot standby conditions while any required manual actions are taken.
- 4. Compliance is not required since the plant can be maintained in a safe hot standby condition while any required manual actions are taken.
- 5. The plant design provides the capability for conducting natural ;
circulation cooldown tests if required. However, other Westinghouse designed pressurized water reactors will have conducted such tests i
prior to operation of future RESAR 35 plants. Because of the great similarity in design between all Westinghouse pressured water reactors, previously conducted tests can be referenced in lieu of conducting such tests on every unit.
- 6. Specific procedures for cooling down using natural circulation will be prepared prior to start up.
- 7. Sufficient auxiliary feedwater is provided in a seismic Category I supply to permit four hours operation at hot standby plus cooldown to RHR initiation conditions, including allowance for time to cor-l rect single failures which might occur.
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h Item. .
RG 1.141 Rev. O Containment Isolation Provisions'for i 1/31/78 Fluid Systems' "
RESPONSE
(3 This Regulatory Guide-describes a method acceptable to the NRC Staff for Q- complying with the commission requirements with respect to containment l isolation. The guide basically endorses the requirements of ANSI- 1 N271-1976 for the design of containment isolation provisions'for fluid l systems. However, several exemptions and changes to the provision of G the standard are also presented.
b Westinghouse's containment isolation philosophy for fluid systems com-plies with the guidance'provided by ANSI N271-1976 and/or Regulatory Guide 1.141 with the'following exceptions and/or clarifications.
- 1. The Standard in Section 3.6.3 states that remote manual closure of isolation valves on ESF or ESF related systems is acceptable when provisions are made to detect possible f ailure of the fluid lines inside and outside containment. Although such provisions are out-side Westinghouse scope of supply,' Westinghouse is of the opinion that provisions to detect f ailure of fluid lines inside containment g are unnecessary. Since redundant ESF capacity is provided and off-i site doses due to leakage inside containment are~not a concern, gd Westinghouse does not require or provide for detection of f ailures in fluid lines inside containment.
- 2. Section 3.6.4 states that a single valve and closed system outside containment isacceptable if'the closed system is treated as an extension of the containment. Further, the standard requries that the valve and the piping between the valve and the containment be enclosed in a protective leak tight or controlled leakage compart-ment. The closed system is also required to be leak tested in accordance with 10 CFR 50 Appendix J unless it can be shown by inspection that system integrity is being maintained for those systems operating during normal plant operation at a pressure equal to or above the containment design pressure.
Westinghouse employs this design arrangement on the ECCS sump isola-tion valves and is in basic agreement with the provisions of the
- standard. However, in the case of the sump isolation valves, l Westinghouse perceives no basis for the requirement to leak test the l s closed system. The recirculation system (closed system), regardless of the sump isolation configuration will be circulating radioactive fluid during LOCA conditions. Should a leak develop in a recircu-lation loop, that loop can be isolated by remote closure of_the sump M
v 38-41
isolation valve to preverit further loss of sump water. Should a leak develop in the isolation valve body or in the piping between the sump and the valve, then the sump fluid will be contained by the leaktight, compartment and guardpipe arrangement. (Westinghouse design does make provision for compartment / guard pipe leak testing)
With these provisions no single active or passive failure will pre-vent the recirculation of core cooling water or adversely affect the integrity of the containment.
- 3. Section 4.2.5 and 4.4.6 of the standard as implemented by item C3 of O
the regulatory guide are intepreted by Westinghouse to state that:
I to preclude cormion mode failures, diversity is required in the parameters sensed from which isolation signals are generated.
Westinghouse design criteria for the initiation of containment iso-lation does nut include a requirement for diversity in the primary station variable for any given design condition or event. Westing-house, however, utilizes different primary station variables to derive and generate the protective function for the first phase (A) of containment isolation. Some diversity is therefore available for this phasp (or a given event. The second phase of containment isolation \ B , which isolates only component cooling water to the 1
reactor coolant pump, is initiated only by a high containment pres-sure signal. Diversity is therefore not available for this con-tainment isolation function, nor is it believed necessary by Westinghouse.
- 4. The standard states in Section 1 that "If an accident occurred, fluid systems penetrating the containment would be isolated except g those which are engineered safety related." With respect to this W recommendatica the following clarification is provided with respect to the reactor conlant pump seal injection line. RESAR 35 utilizes the charging pumps for safety injection, and therefore flow will be provided by the pumps through the seal injection lines following an accident. Each line, however, is equipped with a remote manual containment isolation valve which the operator can close when the charging pumps have completed their safeguard function. The design, therefore, complies with the regulatory guide recommendation in that the seal injection lines are "ESF related."
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Category III.
rs b Item RSB 5-2 Rev. O. Reactor Coolant System Overpressurization 3/14/78 Protection RESPONSE.
The pressurizer power-operated relief valves will be supplied with additional actuation logic to ensure that a completely automatic and independent RCS pressure control backup feature is provided for the operator during low-temperature operations. This system provides the capability for additional RCS inventory letdown, to minimize the rumber of occurrences of pressure transients and to-reduce the severity of. such h
s/ transients, should they occur.
The basic function of the system' logic is to continuously monitor RCS temperature. conditions, with the logic armed whenever plant operation is at low temperatures. An auctioneered system temperature will be con-tinuously converted. to an allowable pressure and then compared to the actual RCS pressure. This comparison, when required, will provide an actuation signal to the power-operated relief valves, n
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l Category IV-A Item 9
RG 1.14 Rev. 1 Reactor Coolant Pump Flywheel Integrity 8/75 RESPONSE ,
1 Since the issuance of Regulatory Guide 1.14, Revision 1, the NRC Staff has provided to Westinghouse a copy of Draft 2, Revision 2 of Regulatory Guide 1.14 (via on April 12, 1976 letter from Robert B. Minogne to.C.
Eiche1dinger). This draft was formulated from industry.and concerned parties' comments. It is significant that the Draft 2 version incor-porates several of the Westinghouse comments on Revision 1. Since .
Draft 2 has not been formally published as Revision 2 of Regulatory Guide 1.14, the exceptions and clarifications '(from the original Westinghouse com'nents) are provided below:
- 1. Post-Spin Inspection Westinghouse has shown in WCAP-8163, " Topical Repcet R2 actor Coolant Pump Integrity in LOCA,* [ll]"that the flywheel would not f ail at 290% of normal speed for a flywheel flaw of 1.15 inches or less in length. Results for a double ended guillotine break at the pump discharge with full separation of pipe ends assumed, show the maxi-mum overspeed to be less than 110% of normal speed. The maximum overspeed was calculated in WCAP-8163 to be about 280% of normal speed for the same postulated break, and an assumed instantaneous loss of power to the reactor coolant pump. In comparison with the overspeed presented above, the flywheel could withstand a speed up to 2.3 times greater than the flywheel spin test speed of 125% pro-l vided that no flaws greater than 1.15 inches are present. If the maximum speed were 125% of normal speed or less, the critical flaw size for failure would exceed 6 inches in length. Non-destructive tests and critical dimension examinations are all performed before the spin tests. The inspection methods employed (described in WCAP-8163) provide asswance that flaws significantly smaller than the critical flaw size of 1.15 inches for 290% of normal speed would be detecteu. Flaws in the flywheel will be recorded in the pre-spin inspection program (see WCAP-8163). Flaw growth attributable to the SPIN test (i.e., from a single reversal of stress, up to speed and back), under the most adverse conditions, it about three orde.s of magnitude smaller than what non-destructive mspection techniques are capable of detecting. For these reasons, Westinghouse performs no post-spin inspection and believes that pre-spin test inspections are adequate.
- 2. Interference Fit Stresses and Excessive Deformation Much of Revision 1 deals with stresses in the flywheel resulting f rom the interference fit between the flywheel and the shaf t.
Because Westinghouse's design specifies a light interference fit 3B-44 t- _ ___.____________ __ _.____ _
between the flywheel and the shaft; at zero speed, the hoop stresses and radial stresses' at the flywheel bore are negligible. Centering
[} of the flywheel relative to the shaft is accomplished by means of v keys and/or centering devices attached to the shaf t, and at normal I 5 peed,-the flywheel is not in contact with the shaft in the sense intended by Revision 1. Hence, the definition of " Excessive Deformation," as defined in Revision 1 of Regulatory Guide 1.14, is
,,, not applicable to the Westinghouse designs since the enlargement of
( the bore and subsequent partial separation of the flywheel from the
\ shaft does not cause unbalance of the flywheel. Extensive Westinghouse experience with reactor coolant pump flywheels installed in this fashion has verified the adequacy of the design.
Westinghouse's position is that combined primary stress levels,.as O aefined in Revision 0 of Safety Guide 14 (C.2) (a) & (c) are both conservative and proven' and that no changes to these stress levels are necessary. Westinghouse designs to these stress limits and thus does not have permanent distortion of the flywheel bore at normal or spin test conditions.
- 3. Section B, Discussion of Cross Rolling Ratio of 1 to 3 Cross Rolling Ratio - Westinghouse's position is that specification of a cross rolling ratio is unnecessary since past evaluations have shown that ASME SA-553-B Class 1 materials produced without this requirement have suitable toughness for typical flywheel applications. Proper material selection and specification of minimum material properties in the transverse direction adequately
, ,e ensure flywheel integrity. An attempt to gain isotropy in the flywheel material by means of cross rolling is unnecessary since adequate margins of safety are provided by both flywheel material selection (ASME SA-533-8 Class 1) and by specifying minimum yield and tensile levels and toughness test values taken in the direction perpendicular to the maximum working direction of the material.
- 4. Section C, Item la relative to vacuum-malting and degassing process or the electroslag process Vacuum Treatment - The requirements for vacuum melting and degassing process or the electroslag process are not essential in meeting the
, s balance of the Regulatory Position nor do they, in themselves, ensure compliance with the overall Regulatory Position. The initial Safety Guide 14 stated that the " flywheel material shculd be produced by a process that minimized flaws in the material and improves its fracture toughness properties." This is acc uplished by using SA-533 material including vacuum treatment.
l 5. Section C, item 2b/ Westinghouse interprets this paragraph as l delineated below. This removes the ambiguous reference to an undefined overspeed transient.
O 38-45
l Design Speed Definition Design speed should be 125% of normal speed or the speed to which the pump motor might be electrically driven by the station turbine generator during anticipated transients, whichever is greater.
Normal speed is defined as the synchronous speed of the a-c drive !
motor at 60 Hz.
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I Category IV-A J
n h Item RG 1.75 Rev. 1 Physical Independence of Electric Systems 1/75 .
RESPONSE
(3 V Specification for field wiring of redundant circuitry to be provided by the applicant.
The physical separation criteria for redundant safety-related system sensors, sensing lines, wireways, cables, and components on racks within p)
( Westinghouse NSSS scope meet recommendations contained in Regulatory Guide 1.75 with the-following comments:
- a. The Westinghouse design of the protection system relies on the provisions of IEEE Standard 384-1974 relative to overcurrent-devices to prevent malfunctions to one circuit from causing unacceptable influences on the functioning ~of the protection system. The protection system uses redundant instrumentation channels and actuation trains and incorporates physical and electrical separation to prevent faults in one channel from degrading any other protection channel,
- b. Separation recommendations for redundant instrumentation racks '
- ^g) are not the same_as.those given in Regulatory Position C.16 of Regulatory Guide 1.75, Revision 1, for the control boards be:ause of different functional requrements. Main control boards contain redundant circuits which are required to be physically separated f rom each other. However, since there are no redundant circuits which share a single compartment of an NSSS protection instrumentation rack, and since these redundant protection instrumentation racks are physically separated from each other, the physical separation requirements specified for-the main control board do not apply.
However, redundant, isolated control signal cables leaving the protection racks are brought into close proximity elsewhere'in
^
the plant, such as the control board. It could be postulated that electrical f aults, or interference, at these locations
(~) might be propagated into~all redundant racks and degrade pro-tection circuits because of the close proximity of protection and control wiring within each rack. Regulatory Guide 1.75 (Regulatory Position C.4) and IEEE Standard 384-1974 (Section 4.5(3)) provide the option to demonstrate by tests that the O absence of physical separation could not significantly reduce the availability of Class 1E circuits.
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Westinghouse test programs have demonstrated that Class 1E pro-tection systems (nuclear instrumentation system, solid state protection system and 7300 process control system) are not degraded by non-Class 1E circuits sharing the same enclosure.
Conformance to the requirements of IEEE Standard 279-1971 and '
Regulatory Guide 1.75 has been established and accepted by the NRC based on the following which is applicable to RESAR.3S.
Tests conducted on the as-built designs of the nuclear instru-mentation system and solid state protection system were reported and accepted by the NRC in support of the Diablo Canyon applica-tion (Docket Nos. 50-275 and~50-323). Westinghouse considers these programs as applicable to all plants. Westinghouse tests on the 7300 process control system were covered in a report entitled, " Westinghouse 7300 Series Process Control System Noise Tests," subsequently reissued as Reference 14. In a letter dated April 20, 1977 (Reference 15) the NRC accepted the report.ir.
which the applicability to RESAR 3S is established,
- c. The physical separation criteria for instrument cabinets within Westinghouse NSSS scope meet the recommendations contained in Section 5.7 of IEEE Standard 384-1974.
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' Category-IV-A. '
( Item RG 1.79 Rev. l' Preoperational Tdsting of Emergency. Core 9/75 . Cooling Systems. for Pressurized Water Reactors
RESPONSE
This regulatory guide is not.within Westinghouse scope. , However,-the:
Westinghouse test program,-as outlined in Chapter 14, conforms ~to-the requirements of'this guide with.the exception of the three items noted.
b'e l ow. .In addition Westinghouse does assist the applicant whenever.the <
1atter' desires assistance.. '
Westinghouse takes exception'to Regulatory Guide:1.79, Revision 1, as follows:
- 1. High PEessure Safety Injection (HPSI)-Flow Test 4 The guide specifies that the cold'and hot safety injection flow test 1
should be-inithted by-the safety injection signal with all affected-auxiliary. systems.in their standard operatine mode.. .
The Westinghouse safety. injection flow test procedures do not require the.use of a safety injection signal to initiate safetyL A injection flow. Other startup test procedures check the operation of circuit breakers, controls, logic and interlocks for the safe-guard. systems.
- Considering the above and that the use of a safety. injection signal would require the racking out of various circuit breakers for- the injection flow tests to negate. unwanted operations, Westinghouse-does not specify the use of a safety injection signal for the injec--
tion flow tests. -
- 2. Low Pressure Safety Injection (LPSI) Recirculation Test-The Regulatory Gui.de specifies that recirculation should be demon-strated by taking suction from the containment floor or sump. The ;
ps Westinghouse . test program recommends that suction be taken from the- -l V RWST. .-The net positive suction head can be determined from the RWST j level and the' level in the' containment-sump and shown'to be greater
]
than.the required net positive suction head for'the pump. The design of the containment sump- and screens- are outside Westinghouse i scope, and therefore, the verif.ication of vortex and control and i O pressure drop across the screens would be peculiar to a particular plant.-
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- 3. Core Flooding Flow Test - Hot Operating Conditions The interit of the test is to verify that check valves that see higher than ambient temperatures during power operation will func-tion at the higher temperatures.
The regulatory guide specifies slowly decreasing RCS pressure and
. temperature until the accumulator check valves operate as indicated by a decrease in accumulator level. -
The Westinghouse test program utilizes the high head safety injec-tion pumps and the check valve leakage test lines to provide flow thr'ough the check valves. Operation of the check valves would be noted by an increase in pressurizer level. The Westinghouse method allows the check valve to be nearer to the operating temperature as a result of the RCS being near operating pressure and temperature versus the lowering the pressure and temperature per the Regulatory Guide. In addition, the Westinghouse test program recommends that the remaining safety injection system check valves that would be sut,jected to RCS temperatures also be checked as described above.
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Category- IV- A Item RG 1.83 Rev. 1 Inservice Inspection of Pressurized Water 7/75 Reactor Steam Generator Tubes
RESPONSE
ID V Access The Westinghouse steam generator design permits access to all'of the tubes for inspection, plugging, or other repair.
g3 Baseline Inspection V
Westinghouse ~ concurs with the option of the last_ paragraph of Section B which permits the shop examination of tubing to serve as an adequate baseline inspection, provided that the examination is do..e in accordance with the requirements of the ASME Code Section III, Subsection N8, Article 2550. The owner may at his option perform the inspection prior to operation of the plant in accordance with paragraph C.3.a.
~ Sample Selection, Testing'and Acceptance Limits
'The details of the inservice inspection are not within the scope of supply of the Nuclear Steam Supply System.
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Category IV-A Item O
RG 1.S9 Rev. 0 Qualification of Class IE Equipment for 11/74 Nuclear Power Plants
~ RESPONSE As discussed in Appeadix 3A to RESAR 35, Westinghouse is continuing to develop methods for implementing IEEE 323-1974 and is consulting with the NRC Staff with regard to these methods.
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Category IV-B Applicable Item- Branch SRP Section- Titie-
~
II. . MTEB 5.4.2.1 BTP METB-5-3 Monitoring of Secondary -
-11/24/75- Side Water. Chemistry in PWR Steam
RESPONSE
As noted. in Section 10.1 of RESAR-3S, the water chemistry of the steam -
fside.and its effectiveness in corrosion control will be discussed in Chapter 10 of the applicants Safety Analyses Report. Recommendations.by O Westinghouse' to the applicant on monitoring of secondary. side water-chemistry are in compliance with BTP MTEB-5-3.
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Category IV-B Applicable Item Branch SRP Section Title 2 CSB 6.2.1, BTP CSB-6-1, Minimum Containment Pres- '
11/24/75 6.2.1A sure Model for PWR ECCS Performance 6.2.18 Evaluation 6.2.1.2 6.2.1.3 6.2.1.4 6.2.1.5 ,
RESPONSE
Westinghouse analyses are in compliance with SRP 6.2.1.5, BTP CSB-61, Minimum Containment Pressure Model for PhR ECCS Evaluation.
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Category IV-B Applicable Item Branch SRP Section Title 3 -CSB 6.2.5 BTP CSB-6-2, Control of Combustible 11/24/75 Gas Concentrations in Containment Fol-
?
lowing a Loss-of-Coolant Accident.
RESPONSE
f i Equipment to maintain control of post LOCA hydrogen within the limits specified in Branch Technical, Position CSB-6-2 is an optional scope item not covered by RESAR 3S.
' When this option is exercised, Westinghouse provides a hydrogen recombiner unit whose design, operating limits, and seismic qualification is in compliance with BTP.CSB-6-2. RESAR-3S Section 15.4.1.2 provides the appropriate interface information per Regulatory Guide 1.7 for the applicant in meeting the requirements of-BTP CS8-6-2. (See response in Category I to RG 1.7) i i
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Category IV-B Applicable Item Brant.h SRP Section Title 5 .
CSB 6.2.4 BTP CSB-6-4, Containment Purging 11/24/75 During Normal Plant Operations.
RESPONSE
Containment purging, in cogliarce with SRP Section 6.2.4, is the responsibility of the utility and/or AE. Hydrogen production rates used to establish purge requirements are supplied as interface information in RESAR 35. This hydrogen production is calculated per Reg. Guide 1.7.
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Category IV-B Applicable Item Branch SRP Section' Title 6 ASB 9.1.4 BTP ASB-9.1, Overhead Handling Systems 11/24/75 for Nuclear Power Plants
RESPONSE
Westinghouse is in compliance with SRP Section 9.1.4, BTP-ASB 9.1 "Over-head Handling Systems for Nuclear Power Plants" for RESAR-3S. Although the overhead crane is not in Westinghouse scope, the results of a drop-O ped vessel head analysis for RESAR-35, which comply with regulatory requirements are included under the Question / Answer Index (question 020.7) of RESAR-3S.
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Category'IV-B Applicable Item Branch SRP Section Title 10 SE8 3.7.2 Procedures for Seismic System Analysis 11/24/75 (SRP Section 3.7.2 par. II)
RESPONSE
Table 3B-2 identifies the RESAR-3S sections where the acceptance criteria of SRP 3.7.3 are addressed. Note that SRP 3.7.3.8 is not in Westinghouse scope. Interactions of non-Category I structures with l
Category I structures are appropriate for coverage in the Applicant's Safety Analysis Report.
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b Item Branch Applicable SRP Section Title 11 SEB 3.7.3 Procedures for Seismic Subsystem 11/24/75 Analysis (SRP Section 3.7.3 par., II)
RESPONSE
~
A matrix which identifies the RESAR-3S section where the acceptance criteria of SRP 3.7.3 are addressed is given in Table 3B-1. The Westinghouse position on SRP 3.7.3.5, which is not addressed in
, RESAR-35, follows 3.7.3.5 Use of Equivalent Static Load Method of Analysis The equivalent static load or static analysis method. involves the multiplication of the total weight of the equipment or component member by-the specified seismic acceleration coefficient. The magnitude o' the seismic acceleration' coefficient is established on the basis of the expected dynamic response characteristics of the component. Components which can be adequately characterized as single degree of freedom systems are considered to have a modal participation factor of one.
Seismic acceleration coefficients for multi-degree of freedom systems e< which may be in the resonance region of the amplified response spectra curves are increased by 50 percent to account conservatively for the increased modal participation.
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Category IV-8 Applicable Item Branch SRP Section Title 14 SEB 3.8.3 Structural Design Criteria for 11/24/75 Category I Structures Inside Con-tainment (SRP Section 3.8.3, par. II).
RESPONSE
The applicant has responsibility for concrete and steel structures inside containment with the exception of supports for the reactor pressure vessel steam generators, reactor coolant numps, pressurizer, and loop piping. Design criteria for the succorts within Westinghouse l scope are addressed in RESAR-35, Section 5.5.1.4.
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I Category IV-B Applicable Item Branch SRP Section Tit el.
17 SEB 3.7 Seismic Design Requirements for Rad-11/24/75 11.2 waste systems and their Housing c .
11.3 Structures (SRP Section 11.2, BTP ETSB l 11.4 11-1, par. B.v)
RESPONSE
Westinghouse Waste Processing Systems meet the requirements of Regula-q . tory Guide 1.143. These guidelines are spelled out in SRP Section 11.2, tg and BTP ETSB 11.1. However, the structures and enclosures housing the waste systems are not within Westinghouse scope. Westinghouse has and will continue to provide all necessary interface information to A/E and ;
. utilities.
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Category IV-B Applicable O Item Branch SRP Section Title 20 ASB 10.4.7 Waterhammer for Steam Generators with 11/24/75 Preheaters (SRP 10.4.7 par. I.2.b)
RESPONSE
The design of the RESAR-3S steam generators with preheaters eliminates the possibility of waterhammer during normal operations. This was con-firmed by a 1/8 scale model test of the steam generator perheat sec-tion. The results of this test were submitted in WCAP-9232 Ll2J, "High Pressure Water Hammer Test of the Split Flow Preheat Steam Generator."
Since the conditions necessary for water hammer could occur during cer-tain accident conditions, WCAP 9232 also summarizes the results of a structural analysis of the. steam generator tubes. The structural analysis results show that even under the combined loadings of a main steam line break and a water hammer event, steam generator tube integ-rity is maintained.
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Category IV-B Applicable-Item Branch SRP Section Title 21 AB 4.4 11/24/75 Thermal-kydraulic Stability (SRP Section 4.4, par. 11.5)
RESPONSE
At this. time Westinghouse is not in full compliance with the require-ments of Section 4.4 par. II.5. However, Westinghouse does not take exception to: the Section, but rather has discussed the issue with the O NRC and is taking the steps necessary to secure NRC approval of the Westinghouse methods.
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Category IV-B ~
Applicable O
Item Branch SRP Section Title 22 RSB 5.2.5 Intersystem Leakage Detection (SRP 11/24/75' Section 5.2.5 par II.4) and RG 1.45
RESPONSE
Reliable methods of intersystem leakage detection for systems connected to the RCS are provided in the RESAR-35 design. Leakage into the RHRS or SIS (the primary NSSS systems of concern) would be directly detect-able by design provisions of both systems. For leakage into piping
&W systems which include surge volumes (e.g. accumulator, boron injection surge tank or RWST) the leakage would be detected by means such as increasing level or pressure indications and/or alarms. For systems which are water solid, leakage would be detected by means such as lifting of relief valves and with, depending on the location, increased level and temperature indication in the relief volume.
The RHRS and SIS are in all cases isolated from the RCS by at least two normally closed valves in series each of which is designed to have zero seat leakage. Where appropriate, these isolation valves comply with requirements of Branch Technical Position ICSB 3 " Isolation of Low Pres-sure from High Pressure Reactor Coolant System." Further, it should be noted that Technical Specifications place stringent limitations on RCS leakage requiring leakage rate to be reduced to the specified limits within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or the plant to be in cold shutdown in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
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_ Category IV-C Applicable Item Branch SRP Section Title 2 SEB 3.7.1 Response Spectra in Vertical ';irection 8/1/76
RESPONSE
The design response spectra of Regulatory Guide 1.60 Rev. 1 are acceptable to Westinghouse with the following exceptions:
f a. The response spectrum for vertical motion is taken as 2/3 the (3v) response spectrum for horizontal motion over the entire range of frequencies'in the western United States.
- b. The damping values recommended and approved by the Staff in WCAP-7921-AR[13] " Damping Values of Nuclear Power Plant Components" are used in dynamic analysis of Westinghouse supplied equipment.
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l Category IV-C Applicable O
Item Branch SRP Section Title 6 RSB 6.3 Passive Failures During Long-Term 6/1/77 Cooling Following LOCA
RESPONSE
Westinghouse philosophy on passive failure meets the intent of the General Design Criteria on single failure as it specifically applies to failure of passive conponents in the ECCS. The complete Westinghcuse position on passive failure criteria may be found in RESAR-3S, Section 6.3.2.11.
The proposed NRC position requires:
- 1. Identification and justification of maximum leak rate. This infor-mation can be provided. A review of the equipment in the ECCS indi-cates that the largest sudden leak potential would be the sudden failure of a pump shaft seal. Evaluation of leak rates showed that flows less than 50 gpm would result. The other items presented in the NRC position fall into the A/E's scope.
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Category IV-C a
p' Applicable ~
g -. It em Branch SRP Section Title PSB' 6.3 7
Control Room Position Indication of 9/1/77 Manual (Handwheel) Valves.in the ECCS
RESPONSE
Manual Valves Manual valves'in the SIS are mainly those required for maintenance, refueling, or test operations. Those valves that, if inproperly posi-
.f tiened, would have an adverse effect on the performance of the ECCS are s . physically locked in the correct position. -Manual throttle valves in the injection branch lines are properly adjusted.by flow tests during initial startup testing. The operating handles on these valves are then removed and' the' stems covered with a locked cover. The manual valves remain locked (either open or closed), therefore, control room position indication.is'not necessary.
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Categqry IV-C Applicable O
Item Branch SRP Section Title 8 SRP 15.1.5 Long-Term Recovery from Steamline Break: Operator Action to Prevent Overpressurization
RESPONSE
For long term cooling following a steamline break, the operator is
~
instrt:ted to use the intact steam generators ~for the purpose of removing decay heat and plant stored energy. This is done by feeding the steam generators with emergency feedwater to maintain an indicated water level in the steam generator narrow-range span.
Steam pressure from the steam generators is relieved by the main steam safety valves or' the steam generator power relief valves. The operator is instructed to terminate emergency feedwater flow to the faulted steam generator as soon as he determines which steam generator is faulted. As soon as an indicated water level returns to the pressurizer, the opera-tor is instructed to turn off the charging pumps to limit system repres-surization.
Following the hypothetical steamline break incident, a steamline isola-tion signal will be generated almost immediately, causing the steamline isolation valves to close within a few seconds. If the break is down-all of which stream of the isolation valves, break subsequently is upstream close the of the isolation break will be isolated. If the valves or one valve fails to close, the break will be isolated from three steam generatocs while the faulted one will continue to blow down. Only the case in which one stcam generator continues to blow down is discussed here since the break followed by isolation of all steam generators will terminate the transient.
A safety injection signal (generated a few seconds after the break) will cause main feedwater isolation to occur. The only source of water available to the faulted steam generator is then the emergency feedwater system. Following steamline isola' ion, steam pressure in the steamline with the faulted steam generator will continue to fall rapidly, while the pressure stabilizes in the remaining two steam lines. The indica-tion of the different steam pressures will be available to the operator within a few seconds of steamline isolation. This will provide the information necessary to identify the faulted steam generator'so that emergency feedwater to it'can be isolated. Manual controls are provided in the control room for start and stop of the emergency feedwater pumps and for the control valves associated with the emergency feedwater system. The means of detecting the faulted steam generator and isola-ting emergency feedwater to it requires only the use of safety grade equipment available following the break. The removal of decay heat'in the long term (following the initial cooldown) using the remaining steam generators requires only the emergency feedwater system as a water source and the secondary system safety valves to relieve steam.
. .. . - - .- - ~
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The op'erator.has'available,-in'the control room,.an indication of-pres-surizer water. level:from the instrumentation.used in.:the reactor-protec-tion system. - Indicated water level: returns 1to thetpressurizer in O approximately five to. seven min'utes' following the steamline break.. To.
maintain the indicated water level, the operator can. start and stop the 4
charging pumps asnecessary.. The pressurizer level instrumentation and
~,
manuals. controls.for operation of the charging pumps meet the required s standards for.. safety. systems.
, AsLindicated, the information for terminating emergency feedwater is
'available to the operator within one minute of the break while the.
information required for. stopping the. charging pumps becomes available within five-to seven min'utes following the break. The requirements tof
. terminate' emergency feedwater flow to the faulted steam generator and.
g stop;the charging pumps ~can-be met by simple switch actions:by the.oper-ators,.i.e.,, closing emergency feedwa?.er discharge valve and stopping' the charging pumps.. Thus, the required simple actions ~to limit the.' ,
cooldown and repressurization can be easily recognized;? planned an'd-performed within. ten. minutes. The time at which-operator actioncis required.to prevent the' pressure-temperature limits from being exceeded
.is in excess of-ten minutes. For decay heat removal.and plant'cooldown
- the' operator has a considerably longer time period in which to respond because of the-large initial cooldown associated with steamline break-transient. .
The safety related indicators for steamline pressure and pressurizer water level noted above are'furether. discussed in Section 7.5.-
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m -y-w -to v -- s , c v t we e w " -m -sec + -',,my-,-rvo- r r n iw ar ",r e-s-e-,m.+e-tem-i- r = -e e w av
Category IV-C Applicable O
Item Branch SRP Section Title 9' RSB 5.4.6 Pump Operability Requirements 12/1/77 5. 7
RESPONSE
The Equipment specification for the SI/RHR pumps to be employed on RESAR-3S applications will require them to be capable of performing their long term cooling function for one year. The same type of pump has been used extensively in other operating plants. -Their function during recurrent normal cooldowns in such plants as Zion, D.C. Cook, and Trojan ha, successfully demonstrated their performance capability.
Periodic inspections have further confirmed their long term operabil-ity. Nevertheless, design provisions are included that would allow maintenance on either pump if it were necessary during long term operation.
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Category IV-C
[
's/ Applicable l Item . Branch SRP Section Title 10 RSB 3.5.1 Gravity Missiles, Vessel Seal Ring l 3/28/78 Missiles Inside Containment k RESPONSE l
Gravity Missiles g The evaluation of the potential for gravity missiles is a function of
(
plant layout and, therefore,'not in the Westinghouse NSSS scope.
Reactor Vessel Cavity Seal Ring Missiles-The reactor vessel cavity seal ring is designed to withstand a pressure from underneath as specified in.each individual plant design. During LOCA conditions, depending upon the specific plant design and . layout, the reactor vessel cavity seal ring may be a potential missile. The l evaluation of the effect of this potential missile on plant safety will i
be discussed in the Applicant's Safety Analysis Report.
n i
v 3
. (v 3B-71
Category IV-C l l Applicable ,
Item Branch SRP Section Title '
11 AB 4.4 Core Thermal-Hydraulic Analysis 1/1/77 NRC Position l '
i In evaluating the thermal-hydraulic performance of the reactor core, the following additional areas should be addressed:
- 1. The effect of radial pressure c'dients at the exit of open lattice Cores.
- 2. The effect of radial pressure e cdients in the upper plenum.
- 3. The effect of fuel rod bowing.
In addition, a commitment to perform tests to verify the transient analysis methods and cets is required.
RESPGNSE Westinghouse is in compliance with items 1, 2, and 3 (effect of radial pressure gravients at exit of pen lattice cores and the upper plenum, and effect of fuel rod bowingj in that these effects have been noted in the Westinghouse evaluation of the thermal-hydraulic performance of the core.
At his time,-Westinghouse does not intend to perform special tests to verify the transient analysis methods and codes. Discussions with the NRC in this area have taken place and will continue in an attempt to resolve this issue.
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3B-72 i _ - _ _ _ - - _ _ - _ _ _ - _ _ _ _ _ _ - _ ___. _ - _ _ _ _ _ - _ _ _ _ _ _ _ - _ - _ -
\
o Category IV-C O Item Branch Applicable
.SRP Section Title l
13 CSB 5.2.1.2 Asymmetric Loads on Components 6/1/76 Located Within Containment Subcompartments.
RESPONSE
l Westinghouse addresses asymmetric loads on components located witnin containment subcompartments (in compliance with SRP 6.2.1.2) in the Applicants Safety Analysis Reports, since the loads are plant specific.
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Category IV-C Applicable O
Item Branch SRP Section Title 15 SRP ~6.2.1.4 Containment Response Due to Maio 1/1/77 Steamline Break and Failure of MSLIV
-to Close
RESPONSE
Westinghouse cannot provide a containment response analysis, since containment design is not in Westinghouse scope. Steamline break mass-energy release tource term data can be supplied when require' 1
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6 3B-74
l 1
' Category IV-C -
f'\ .
, V Applicable l Item Branch SRP Section Title J l
17 ASB 9.2.2 Design Requirements for Cooling Water ,
, 1/1/77 to Reactor Coolant Pumps '
RESPONSE
Component cooling water system design will be discussed in Section 9.2.2 )
of the applicant's PSAR. The portions of the component cooling. water '
system supplying safeguards equipment will be designed tu meet. single Ci active failure criteria or moderate energy line crack criteria. Abnor-V mal conditions affecting the portions of the component cooling water system which supply non-safeguards equipment (i.e. reactor coolant pumps) will be mitigated by the appropriate operator action.
As' discussed in Section 5.5.1, component cooling water is supplied to the pump motor bearing oil coolers and to the pump thermal barrier heat exchanger. Should a loss of component cooling water to the reactor coolant pumps occur, the Chemical and Volume Control System continues to provide injection water to the reactor coolant pumps; the seal injection flow is sufficient to prevent damage to the seals with a loss of thermal barrier ,oling. The loss of component cooling water to the motor bear-ing oil colers will result in an increase in lube oil temperature and a corresponding rise in bearing metal temperature. Actual testing has
(' shown that the manuf acturer's recommended maximum bearing operating temperature will be rea.hed in approximately ten minutes. Therefore, the reactor coolant pumps will incur no damage with a component cooling water flow interruption of 10 minutes.
Westinghouse has conducted a human engineering analysis of this event during normal operation, considering the follcuing factors:
- 1. The CCW flow indicator and alarm for the CCWS return line from each RCP oil cooler are located on the main control board.
- 2. The CCW temperature indicator and alarm for the CCW3 return line f, w each RCP oil cooler are located en the main control board.
O d 3. The reactor coolant pump motor bearing temperature is supplied as input to the process computer. A high temperature will cause the computer to alarm and identify the high temperature.
- 4. The CCWS isolation valve monitor lights, which would indicate valve h
%7 closure, are located on the main control board.
- 5. The psychological stress induced on the average trained operator is much less than that induced by a LOCA (reference WASH-1400) which would cause a response time delay on one minute.
. (D V
- 6. The response time required of the operator to trip the reactor and stop the reactor coolant pumps is not complicated and is a direct logical result of the event symptoms as alarmed and inciated.
In conclusion, Westinghouse believes that the NRC'a alternatives given in Item IV.C.17 constitute a significant change in regulatogy require-Because this issue has not been considered by the R C and ments.
because a value-impact statement has not been performed, the NRC's request for a change in design is inappropriate.
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O 3B-76
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Category.IV-C O 1 d Item Branch Applicable-SRP Section Title i
- 18. ASB 10.4.7. Design Guidelines for Water Hammer 8/1/76 in Steam Generators with Top Feedrign 1 Design (BTP ASB-10.2)
. RESPONSE The steam generators employed in the RESAR-3S design are of the preheater type and do not employ top feedring design. Therefore,.
BTP-ASB-10.2 is not applicable. For a discussion of water hammer in-p)s
( RESAR-3S steam generators, refer to the' response to item IV.B.20, above,
" Water Hanner for Steam Generators with Preheaters (SRP 10.4.7 par.
I.2.b)"
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3B-77 g g. . , . . . .
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REFERENCES -
hd 1.
" Westinghouse Water Reactor Divisions Quality Assurance Plan,"
WCAP-8370, Revision 8A, September 1977.
2.
" Nuclear Fuel Division Reliability and Quality Assurance Plan,"
WCAP-7800, Rw. 5, December 6,1977.
(V ) 3.
" Methodology for Qualifying Westinghouse PWR-SD Supplied NSSS Safety Related Electrical Equipment, WCAP-8587-R1, September 1977, Supple-ment 1, Rev. 1, November 1978.
- 4. " General Method of Developing Multifrequency Biaxial Test Inputs for g Bistables," WCAP-8695, September 1975.
U 5.
" Fuel Densification Experimental Results and Model for Reactor Appli-cation," WCAP-8218-P-A (Proprietary Class 2), WCAP-8219-A (Non-Pro-prietary, Class 3), March 1975.
- 6. " Design, Inspection, Operation, and Maintenance Aspects of the Westinghouse Nuclear Steam Supply System to Maintain Occupational Radiation Exposures as Low as Reasonably Achievable," WCAP-8872, April 1977.
7.
Letter of Comment on Rev. O of Reg. Guide 1.99 to the Secretary of the Commission by C. E. Eicheldinger, NS CE-784,_ September 22, 1975.
p)
(
- 8. Hawthorne, J. R.,
" Radiation Ef fects Information Generated on the ASTM Reference Correlation - Monitor Steels," to be published.
- 9. Westinghouse RESAR-3S, Chapter 16, Figure B3/4' 4.2, Page B3/4.
- 10. Letter NS-TMA-1843 to the Secretary of the Commission by T. M. Anderson, June 23, 1978.
- 11. " Reactor Coolant Pump Integrity in LOCA," WCAP-8163, September 1973..
- 12. "High Pressure Water Hammer Test of the Split Flow Preheat Steam Generator," WCAP-9232, January 1978.
- 13. " Damping Valves of Nuclear Power Plant Components," WCAP-7921-AR, May 1974.
- 14. Marasco, F. W. and Siroky, R. M., " Westinghouse 7300 Series Process Control System Noise Tests," WCAP-8892-A, June,1977.
I
- 15. Letter dated April 20, 1977 from R. L. Tedesco (NRC) to C. Eicheldinger (Westinghouse),
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f l-3B-78
7 TABLE 38-1 CROSS REFERENCE OF RESAR-35 TO STANDARD REVIEW PLAN SRP ACCEPTANCE CRITERIA SRP RESAR-35 Sectiort 3.7.3.1 3.7.3.2 3.7.3.3 3.7.3.4 3.7.3.5* 3.7.3.6 3.7.3.7 3.7.3.8 3.7.3.9 3.7.3.10 3.7.3.11 3.7.3.12 3.7.3.13 3.7.3.14 3.7.3.15 3.7.3!1 X 3.' 7.3. 2 - X
'~
3.7.3.3 3.7.3.4 'X 3.7.3.5 3.7.3.6 X.
3.7.3.7 %
3.7.3.8 3.7.3.9 3.7.3.10 3.7.3.11 X j 3.7.3.12 X
[ 3.7.3.13 X 3./.3.14 3.7.3.15 X 3.7.2.1 X X 4
3.7.2.7 X 3.7.2.9 X 3.7.2.14 X
- See response to-IV.B.11.
i' 3B-79
, sa ,
F --teJ-mm-g ,n -
y w, y- ~
3 __ .m ______._______________._______,__m____,m_____ _, _ m.___,
.% - .,.S -g p g %g g d (J J v d U d TABLE 38-2 CROSS REFERENCE OF RESAR-35 TO STANDARD REVIEW PLAN 4
SRL ICEPTANCE CRITERIA SRP RESAR-35 Section 3.7.2.1 3.7.2.2 3.7.2.3 3.7.2.4 3.7.2.5 3.7.2.6 3.7.2.7 3.7.2.R* 3.7.2.9 3.7.2.10 3.7.2.11 3.7.2.12 3.7.2.13 3.7.2.14 3.7.2.15 3.7.2.1 X
. 3.7.2.2 X 3.7.2.3 X 3.7.2.4 X 3.7.2.5 X 3.7.2.6 X 3.7.2.7 3.7.2.8 X 3.7.2.9 X 3.7.2.10 I X 3.7.2.11 .X 3.7.2.12 X
~
3.7.2.13 X 3.7.2.14 X 3.7.3.4 X 3.7.3.7 X
- Not in Westinghouse scope. -
l 38-80
i l
1 l
1 l
A .'.. 160 1
V (1) ALLOWABLE STRESS UNDER SERVICE LEVEL A.
I SERVICE LEVEL B. AND DESIGN CONDITION PER ASME CODE CASE 1644.
(2) ALLOWABLE STRESS UNDER SERVICE LEVEL C' PER 140 ASME CODE C ASE 1644 AND APPENDIX 0[II-2110.
) '
(3) ALLOWABLE STRESS UNDER SERVICE LEVEL.D PER O ASME CODE CASE 1644 AND APPENDlX F-1370.
(4) ULTIMATE STRENGTH PER TEST RESULTS (l" DIA.
SA325 BOLTS) 120 -
/
O 100 -
ULTI MA TE
.$ STREN GTH w
SAFETY MARGlN ;
w f s
80 MAXIMUM
$ j 3 ALLOWABLE FOR SERVICE LEVEL D E '
w
- 60 -
.)
2 40
- l I
./ '
/
20 -
/
/
/
/
-) l - l l- l 0 * ' ' - ' ' '
O 20 40 60 80 100 I20 SHEAR STRESS (ksi)
O' Figure ~ 3B-1 Comparison of-Tensile Stress for Bolts
-fN- :RESAR-3S AMENDMENT 14 El ). DECEMBER,1978 4
,p. -.
t p- 38-81
_ _ - _ . , . _ , . . . . . . , . . _ _ . . _ . . - . - . _ . _ . . - , - ~ .
, . . - . _ . . . _ . _ . . _ . ~ . - _ . . _ . . _ . . - _ - . _ . _ ~ . . - _.
- O1 T-S STRESS RATIO A l'.0:0,2. 1.0:0.67' O.67:1.0 0.2.l.0 O1 g
(' 4.0
.l- I l I ,
d
?
5 Oi {
m 3.0 -
sJ ,
~
LA.
M 2.0 -
< l g
. W a .('
-) s 1.0' -
.1 g
C-I 5 ' I 0.0 h I.0:0.0 1.0:0.42 l.0:1.0 0.42:1.0 0.0:1.0 ,
1 T S STRESS RATIO O) Figure 3B-2 Factor of Safety Againist Failure Under Service Level D as a Function of T-S Rttio ,
c ]
RESAR-3S AMENDMENT 14 DECEMBER,1978 f
. . . . . . . . . . . . . . . . . . . . . . .. . . . .