ML072070354
| ML072070354 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Kewaunee, Surry, North Anna  |
| Issue date: | 07/25/2007 |
| From: | Grecheck E Dominion Energy Kewaunee, Dominion Nuclear Connecticut, Dominion Resources Services, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 07-0416, RG-1.084 | |
| Download: ML072070354 (11) | |
Text
Dominion Resources Services, Inc.
5000 Dominion Boulevard, Glcn Allen, VA L300It
\\X ch Address: www.dom.com July 25, 2007 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Serial No.:
07-041 6 N L&OS/ETS:
RO Docket Nos. :
50-305 50-3361423 50-3381339 50-2801281 License Nos.:
D PR-43 DPR-65lNPF-49 N P F-417 DPR-32/37 DOMINION ENERGY KEWAUNEE. INC. (DEK)
DOMINION NUCLEAR CONNECTICUT. INC. (DNC)
VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
KEWAUNEE POWER STATION MILLSTONE POWER STATION UNITS 2 AND 3 NORTH ANNA POWER STATION UNITS 1 AND 2 SURRY POWER STATION UNITS 1 AND 2 ALTERNATIVE REQUESTS FOR USE OF ASME SECTION Ill, DIVISION 1. CODE CASES N-756 AND N-757 In accordance with the guidance provided in NRC Regulatory Guide 1.84, Design, Fabrication, And Materials Code Case Acceptability, ASME Section Ill, Revision 33, August 2005, Dominion Energy Kewaunee, I nc. (DEK), Dominion Nuclear Connecticut, Inc. (DNC) and Virginia Electric and Power Company (Dominion), request approval to use the alternative rules of ASME Code Cases N-756 and N-757 reprinted in this letter by permission of ASME and provided in Attachment 1. These Code Cases contain alternative rules for the design of nonwelded Class 1, 2, and 3 valves, 1 -inch nominal pipe size (NPS) and smaller, that may be used for replacements and design changes at Kewaunee Power Station, Millstone Power Station Units 2 and 3, North Anna Power Station Units 1 and 2, and Surry Power Station Units 1 and 2, subject to NRC approval of the attached requests to use these Code Cases pursuant to 10 CFR 50.55a(a)(3)(i).
Recently, an ASME certified supplier has developed a new product line of small valves for instrumentation and sampling line applications in Class 1, 2, and 3 systems with nonwelded end connections other than flanges, that do not meet the current design thickness requirements or other design-related provisions in ASME Section Ill. As a result of this situation, ASME has developed new alternative design rules in these two Code Cases to accept these types of valves for Section Ill applications. Because these Code Cases are new and have just been approved by ASME on January 21, 2007, the Code Cases have not yet been published in the ASME Code Cases Nuclear Components Book and have not been endorsed by the NRC and included into Regulatory Guide 1.84.
Therefore, DEK, DNC, and Dominion request approval to use valves designed to these Code Cases as an alternative to the Section Ill, Division 1, Editions and Addenda requirements referenced as approved for use in 10 CFR 50.55a up to and including the
Serial No.07-041 6 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Alternative Requests for Use of ASME Code Cases N-756 and N-757 Page 2 of 4 2003 Addenda, and subject to the future limitations in the regulation and as applicable to each of the DEK, DNC, and Dominion Units listed above.
DEK, DNC, and Dominion have determined, as discussed in Attachment 2, that the use of these small valves, when designed in accordance with these new Code Cases and their alternative Section Ill design rules, provide an acceptable level of quality and safety.
Therefore, these relief requests meet the necessary requirements for approval under 10 CFR 50.55a(a)(3)(i).
To support the next refueling outage where these new valves may be used, which is the Millstone Unit 2 Spring 2008 outage, DEK, DNC, and Dominion requests NRC complete its review and approval of these requests by February 1, 2008.
If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, Eugene S. Grecheck Vice President - Nuclear Support Services Attachments:
- 1. ASME Code Case N-756, Alternative Rules for Acceptability for Class 1 Valves, NPS 1 (DN 25) and Smaller With Nonwelded End Connections Other Than Flanges Section Ill, Division 1 and ASME Code Case N-757, Alternative Rules for Acceptability for Class 2 and 3 Valves, NPS 1 (DN 25) and Smaller With Welded and Nonwelded End Connections Other Than Flanges Section Ill, Division 1.
- 2. DEK-Kewaunee Power Station Alternative Request, RR-G-6, DNC - Millstone Power Station Units 2 and 3 Alternative Requests, RR-89-63 and IR-2-49, and Dominion -
North Anna Power Station Units 1 and 2, Alternative Request, NAPS-ISI-07-009 and Surry Power Station Units 1 and 2 Alternative Request, SPS-ISI-07-007.
Serial No.07-041 6 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Alternative Requests for Use of ASME Code Cases N-756 and N-757 Page 3 of 4 cc: U. S. Nuclear Regulatory Commission Region I Regional Administrator 475 Allendale Road King of Prussia, PA 19406-1 41 5 U. S. Nuclear Regulatory Commission Region I1 Regional Administrator Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 231 -85 Atlanta, Georgia 30303 U. S. Nuclear Regulatory Commission Region Ill Regional Administrator 2443 Warrenville Road Suite 21 0 Lisle, I lli nois 60532-4352 Ms. M. H. Chernoff Project Manager Kewaunee U. S. Nuclear Regulatory Commission, Mail Stop 0-8 G9A One White Flint North 1 1 555 Rockvi lle Pike Rockville, MD 20852-2738 Mr. J. D. Hughey NRC Project Manager Millstone Units 2 and 3 U. S. Nuclear Regulatory Commission, Mail Stop 0- 8 B3 One White Flint North 1 1555 Rockville Pike Rockville, MD 20852-2738 Mr. S. P. Lingam NRC Project Manager Surry U. S. Nuclear Regulatory Commission, Mail Stop 0-8 G9A One White Flint North 1 1 555 Rockville Pike Rockville, MD 20852-2738
Serial No.07-041 6 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Alternative Requests for Use of ASME Code Cases N-756 and N-757 Page 4 of 4 Mr. R. A. Jervey NRC Project Manager North Anna U. S. Nuclear Regulatory Commission, Mail Stop 0-8-G9A One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Mr. S. C. Burton NRC Senior Resident lnspector Kewaunee Power Station NRC Senior Resident lnspector Millstone Power Station NRC Senior Resident lnspector Surry Power Station Mr. J. T. Reece NRC Senior Resident lnspector North Anna Power Station Mr. M. M. Grace Authorized Nuclear lnsurance lnspector North Anna Power Station Mr. R. A. Smith Authorized Nuclear Insurance lnspector Surry Power Station
Serial No. 07-0416 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 ATTACHMENT 1 ASME CODE CASE N-756, "ALTERNATIVE RULES FOR ACCEPTABILITY FOR CLASS 1 VALVES, NPS 1 (DN 25) AND SMALLER WlTH NONWELDED END CONNECTIONS OTHER THAN FLANGES SECTION Ill, DIVISION 1 "
ASME CODE CASE N-757, "ALTERNATIVE RULES FOR ACCEPTABILITY FOR CLASS 2 AND 3 VALVES. NPS 1 (DN 25) AND SMALLER WlTH WELDED AND NONWELDED END CONNECTIONS OTHER THAN FLANGES SECTION Ill, DIVISION 1 "
DOMINION ENERGY KEWAUNEE, INC. (DEK)
DOMINION NUCLEAR CONNECTICUT, INC. (DNC)
VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
KEWAUNEE POWER STATION MILLSTONE POWER STATION UNITS 2 AND 3 NORTH ANNA POWER STATION UNITS 1 AND 2 SURRY POWER STATION UNITS 1 AND 2
- Reprinted from ASME 2007 BPVC, Code Cases, Nuclear Components, By permission of the American Society of Mechanical Engineers, All rights reserved.
CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approval Date: January 21,2007 The ASME Boiler and Pressure Vessel Standards Committee took action to eliminate Code Case expiration dates effective March 11,2005. This means that all Code Cases listed in this Supplement and beyond will remain available for use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.
07 Case N-756 Alternative Rules for Acceptability for Class 1 Valves, NPS I (DN 25) and Smaller With Nonwelded End Con-nections Other Than Flanges Section 111, Division 1 Inquiry: Under what rules may instrument, control, and sampling line valves, NPS 1 @N 25) and smaller, with nonwelded piping end connections other than flanges, be designed in accordance with the alternative provisions of NB-35 l3.2?
Reply: It is the opinion of the Committee that instru-ment, control, and sampling line valves, NSP 1 (DN 25)
CASE N-756 and smaller, with nonwelded piping end connections other than flanges, may also be designed in accordance with the alternative provisionsof NB-3512.2(d) for weld end valves, provided the following requirements are met:
(a) The end connections shall meet the requirements of NB-3671.3 oc NB-3671.4.
(b) The design shall be quaIified in accordance with the requirements of MSS-SP-105-2005, Section 5.
(c) Valve bonnets threaded directly into valve bodies shall have a lock weld or locking device that assures the assembIy does not disengage either through stem operation or vibration.
(d) This Case number shall be identified on the NPV-1 Data Report Form.
I The Committee's function is to establish rules of safely, relating only to pressure integrity, governing the wnstrvction of boilers. pressure vessels, transpon tanks and nuclear components, and Insenrice Inwecllon for pressure integrity of nuclear components and transport tanks. and to interprui these rules when questions arise I I repardina their intent.This Code does not address other SafeN issues relating to the construction of bollers. oressure varse(s.transoorttenksand nuclear comoanents. 1 and the inservice lnspecllon of nuclear componenls and transport tanks. ~ 6 e user of the Cods should refeito other pertinent co&,
standards, laws. regulhons or other relevant documents.
I -
I PDF RELEASE 1 (N-7.56) 2007 Edition - NC
Gal lx H004027570 04-26-07 14:09:59 Footer: NC - SUPP. 1 (Status: ON)
PDF Footer: PDF RELEASE (Status: ON)
Case number: N-757 Approval Data: January 21,2007 The ASME Boiler and Pressurn Vessel Standards Committee took action to eliminate Code Case expiration dares effZPctive March 11,2005. This means that all Code Cases listed in this Supplement and beyond will remain available for use until annulled by the ASME Boiler end Pressure Vessel Standards Committee.
Case N-757 Alternative Rules for Acceptability for Class 2 and 3 Valves, NPS 1 @N 25) and Smaller With Welded a d Nonwelded End Connections Other Than FlangesSection III, Division 1 Inquiry: Under what rules may instrument, control and sampling line valves. NPS 1 (DN 25) and smaller, with welded and nonwelded end connections other than flanges, meet the design requirements of Section III, Division 1, Class 2 and 3 rules of NC-3512 amd ND-3512, when the valve minimum wall thickness does not meet the t, requirements of ASME B l6.34?
Reply: It is the opinion of the Committee that instru-ment, control and sampling l i e valves, NPS 1 @N 25) and smaller, having valve minimum wall thickness not in accordance with the t,,, requirements of ASME B16.34 with welded and nonwelded end connections other than flanges, may meet the design requirements of Section 111, Division 1, Class 2 and 3 rules of NC-3500 and ND-3500, provided the following additional requirements are met:
(a) Valves not meeting the t,,, wall thickness require-ments of ASME B16.34, shall meet the pressure design rules of NC-3324 and ND-3324; an experimental stress analysis (Section III, Division 1, Appendix II); or Design Based on Stress Anslysis (Section III, Division 1, Appendix WI).
The &sign shall be qualified in accordance with the requirements of MSS-SP-105-2005, Section 5.
(b) The end connections shall meet the requirements of NC-3661 and ND-3661, -3671.3 or -3671.4. for welded, threaded, and flared, flareless and compression type fittings tube ends.
(c) Valve bonnets threaded directly into valve bodies shall have a lock weld or locking device to assure that the assembly does not disengage either through stem opeation or vibration.
(d) This Case number shall be identified on the NPV-1 Data Report Form.
Serial No.07-041 6 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 ATTACHMENT 2 USE OF ASME CODE CASES N-756 AND N-757. SECTION Ill. DIVISION 1 KEWAUNEE POWER STATION ALTERNATIVE REQUEST, RR-G-6, MILLSTONE POWER STATION UNlTS 2 AND 3 ALTERNATIVE REQUESTS, RR-89-63 AND IR-2-49 NORTH ANNA POWER STATION UNlTS 1 AND 2, ALTERNATIVE REQUEST, NAPS-ISI-07-009 SURRY POWER STATION UNlTS 1 AND 2 ALTERNATIVE REQUEST, SPS-ISI-07-007 DOMINION ENERGY KEWAUNEE, INC. (DEK)
DOMINION NUCLEAR CONNECTICUT, INC. (DNC)
VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
KEWAUNEE POWER STATION MILLSTONE POWER STATION UNlTS 2 AND 3 NORTH ANNA POWER STATION UNlTS 1 AND 2 SURRY POWER STATION UNlTS 1 AND 2
Serial No. 07-0416 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Page 1 of 3 Use of ASME Code Cases N-756 and N-757. Section Ill, Division 1 Kewaunee Power Station Alternative Reauest, RR-G-6. Millstone Power Station Units 2 and 3 Alternative Reauests. RR-89-63 and IR-2-49, and North Anna Power Station Units 1 and 2. Alternative Reauest. NAPS-ISI-07-009 and Surrv Power Station Units 1 and 2 Alternative Reauest. SPS-ISI-07-007 TABLE OF CONTENTS ASME CODE COMPONENTS AFFECTED....................................................
2 APPLICABLE CODE EDITION AND ADDENDA............................................2 APPLICABLE CODE REQUIREMENTS......................................................... 2 REASON FOR REQUEST..............................................................................
2 PROPOSED ALTERNATIVE AND BASIS FOR USE..................................... 3 DURATION OF THE PROPOSED ALTERNATIVE........................................ 3 PRECEDENTS...............................................................................................
3
Serial No. 07-0416 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Page 2 of 3 Kewaunee Power Station Alternative Reauest. RR-G-6. Millstone Power Station Units 2 and 3 Alternative Reauests. RR-89-63 and IR-2-49. and North Anna Power S t a t i o n Units 1 and 2. Alternative Reauest, NAPS-ISI-07-009 and Surrv Power Station Units 1 and 2 Alternative Reauest, SPS-ISI-07-007 for Use of ASME Code Cases N-756 and N-757. Section Ill. Division 1 Proposed Alternative In Accordance with 1 0 CFR 50.55a(a) (3) (0
- Alternative Provides Acceptable Level of Quality and Safety -
1.0 ASME CODE COMPONENTS AFFECTED:
Code Class: 1, 2, and 3 System:
Valves inch nominal pipe size and less with nonwelded end connections other than flanges in Class 1, 2, and 3 systems.
Valves, I-inch nominal pipe size and less nonwelded instrumentation and sampling line valves, designed to the alternative rules in Code Case N-756 for Class 1 and Code Case N-757 for Class 2 and 3, will be used as needed for replacements or design changes at Kewaunee Power Station (KPS), Millstone Power Station Units 2 and 3 (MPS2 and MPS3), North Anna Power Station Units 1 and 2 (NAPS1 and NAPS2), and Surry Power Station Units 1 and 2 (SPSI and SPS2).
2.0 APPLICABLE CODE EDITION AND ADDENDA:
Within Code Cases N-756 and N-757, specific design requirements of Section Ill, Division 1 are specified for attributes such as NB-3671.3 or NB-3671.4 for Class 1 end connections and NC-3661 and ND-3661 etc., for Class 2 and 3 end connections. Each of these references to Section Ill provisions may be used consistent with the Section Ill Editions and Addenda that are acceptable for use pursuant to 10 CFR 50.55a and applicable to that station.
3.0 APPLICABLE CODE REQUIREMENTS:
As part of the alternative design rules in these Code Cases and in addition to the Section Ill requirements specified within these Code Cases, the design of the valves must be qualified in accordance with the requirements of Manufacturers Standardization Society (MSS), Standard Practice (SP) MSS-SP-105-2005, Section 5.
4.0 REASON FOR REQUEST:
Allowing the use of these small nonwelded valves for Class 1, 2, and 3 instrumentation and sampling line applications will reduce personnel radiation exposure for virtually all
Serial No.07-041 6 Docket Nos. 50-305, 50-3361423, 50-3381339, 50-2801281 Page 3 of 3 applicable Class 1 valve replacements and applicable design changes.
A similar potential for the same reductions in personnel exposure applies for portions of Class 2 systems that are located in areas such as charging pump cubicles and other high radiation areas outside the primary containment.
5.0 PROPOSED ALTERNATIVE AND BASIS FOR USE:
The proposed alternative is to allow DEK, DNC, and Dominion to accept the provisions of Code Case N-756 and N-757 from an ASME certificate holder in the purchase and use of nonwelded small ASME N-stamped Class 1, 2, or 3 valves that have been designed in accordance with the alternative rules of both of the Section Ill, Code Cases.
With approval of this alternative by the NRC, these valves will be used for replacement or design changes in applicable Class 1, 2, or 3 systems at KPS, MPS2, MPS3, NAPSI, NAPS2, SPSI, and SPS2. These valves will be identified by the supplier as meeting the alternative design requirements of these Code Cases by listing the applicable Code Case N-756 for Class 1 valves or Code Case N-757 for Class 2 or 3 valves on the required ASME NPV-1 Data Report Form.
Upon review of the requirements in the Code Cases, DEK, DNC, and Dominion have determined that the requirements, as approved by ASME, in these Code Cases are sufficient to effectively assure that valves designed to these alternative rules will meet the necessary structural integrity requirements of ASME Section Ill and thus provide an acceptable level of quality and safety.
6.0 DURATION OF PROPOSED ALTERNATIVE:
Since this request applies to the use of Section Ill Code Cases related to the design requirements for small valves, the duration for the use of this request will be for the life of the valves designed to these requirements.
7.0 PRECEDENTS
These Code Cases have just recently been approved by ASME and were released with special permission from ASME to be used for this request at all the DEK, DNC, and Dominion Units. We know of no other previous requests involving the use of these Code Cases.