ML20087F977
| ML20087F977 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/10/1995 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 95-379, NUDOCS 9508160144 | |
| Download: ML20087F977 (3) | |
Text
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i VINGINIA ELI:CTHIC ann Powna COMPANY RicnwoNn,VINGINIA 20261 August 10, 1995 1
United States Nuclear Regulatory Commission Serial No.95-379 Attention: Document Control Desk NO/ETS Washington, D. C. 20555 Docket No.
50-338 License No.
NPF-4 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY MQRTH ANNA POWER STATION UNIT 1 INSERVICE INSPECTION PROGRAM.
ASME CODE CASE N-498-1 ASME Code Case N-498-1 (attached), " Alternative Rules for 10-Year System Hydrostatic Testing for Class 1,2, and 3 SystemsSection XI, Division 1," was approved by ASME on May 11, 1994 This Code Case has not been approved for use by Regulatory Guide 1.147, inservice Inspection Code Case Acceptability ASME Section XI Division 1, due to its recent approval by ASME. Therefore, pursuant to 10 CFR 50.55a(a)(3), it is requested that Code Case N-498-1 be approved for use at North Anna Unit 1 to complete its second interval requirements.
North Anna Unit 1 is scheduled to complete its second interval,10-year inservice inspections during its next refueling outage, which is currently scheduled to begin February 9,1996. Code Case N-498-1 now provides an attemative to the Class 3, as well as the Class 1 and 2 (N-498) hydrostatic test Code requirements (ASME Section XI 1983 Edition, Summer 1983 addenda). Planning requirements associated with this upcoming outage necessitate that advance approval for use of Code Case N-498-1 be obtained in lieu of the normal Regulatory Guide 1.147 revision process.
Hydrostatic tests are historically difficult to perform. They frequently require extending test durations while non-safety related issues such as maintenance boundary valve isolation problems are resolved. This increases the cummulative exposure of test l
personnel and system tag-out duration. By taking advantage of Code Case N-498-1, increased testing flexibility is provided, allowing testing to be performed at nominal operating pressure. In turn, this significantly reduces the number of test blocks, system tag-outs, and corresponding boundary valves required to complete testing. This flexibility is accomplished while maintaining an acceptable level of safety and quality as determined by the ASME Code consensus process.
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~ Code Case N-498-1 will continue to provide assurance of component structural integrity as intended by the ASME Code and, as such, it is requested that interim use of the Code Case be approved for the upcoming North Anna Unit 1 outage.
If you have any questions conceming this request, please contact us.
Very truly yours, w
James P. O'Hanlon Senior Vice President - Nuclear i
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cc:
U. S. Nuclear Regulatory Commission Region ll 101 Marietta Gireet, N. W.
Suite 2900 Atlanta, Georg;a 30323 Mr. R. D. McWhoder NRC Senior Resident inspector Nodh Anna Power Station i
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CASE N-498-1 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approval Date: May 11,1994 See NumericalIndex for expiration and any reaffirmation dates.
Case N-4981 (2) The boundary subject to test pressurization Alternative Rules for 10-Year System Hydrostatic during the system pressure test shall extend to all Testing for Class 1,2, and 3 Systems Class 2 components included in those portions of sys-Section XI, Division 1 tems required to operate or support the safety system function up to and including the first normally closed Inquiry: What alternative rules may be used in lieu valve, including a safety or relief valve, or valve ca-of those required by Section XI, Division 1, Table pable of automatic closure when the safety function IWB-2500-1, Category B-P, Table IWC-2500-1, Cat-is required.
egory C-H, and Table IWD-2500-1, Categories D A, (3) Prior to performing the VT-2 visual exami-D-B, and D-C, as applicable, for the 10-year system nation, the system shall be pressurized to nominal hydrostatic test?
operating pressure for a minimum of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for in-sulated systems and 10 minutes for noninsulated sys-tems. The system shall be maintained at nominal op -
erating pressure during performance of the VT-2 Reply:
visual examination.
(a) It is the opinion of the Committee that as an (4) The VT-2 visual examination shall include alternative to the 10-year system hydrostatic test re.
all components within the boundary identified in quired by Table IWB-2500-1, Category B-P, the fol-(b)(2) above, lowing rules shall be used.
(5) Test instrumentation requirements of IWA-(1) A system leakage test (IWB 5221) shall be 5260 are not applicable.
conducted at or near the end of each inspection in-(c) It is the opinion of the Committee that, as an terval, prior to reactor startup, alternative to the 10-year system hydrostatic test re-(2) The boundary subject to test pressurization quired by Table IWD-2500-1, Categories D-A, D-B, during the system leakage test shall extend to all or D-C (D-B for the 1989 Edition with the 1991 and l
Class 1 pressure retaining components within tl.e sys-subsequent Addenda), as applicable, the following tem boundary, rules shall be used.
(3) Prior to performing the VT-2 visual exami-(1) A system pressure test shall be conducted at nation, the system shall be pressurized to nominal or near the end of each inspection interval or during operating pressure for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for insulated the same inspection period of each inspection inter-systems and 10 minutes for noninsulated systems.
val of Inspection Program B.
The system shall be maintained at nominal operating (2) The boundary subject to test pressurization l
pressure during performance of the VT-2 visual ex-during the system pressure test shall extend to all amination.
Class 3 components included in those portions of sys-(4) Test temperatures and pressures shall not tems required to operate or support the safety system exceed limiting conditions for the hydrostatic test function up to and including the first normally closed curve as contained in the plant Technical Specifica-valve, including a safety or relief valve, or valve ca-tions.
pable of automatic closure when the safety function (5) The VT-2 visual examination shall include is required.
all components within the boundary identified in (3) Prior to performing the VT-2 visual exami.
(a)(2) above.
nation, the system shall be pressurized to nominal *
(6) Test instrumentation requirements of IWA.
operating pressure for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for insulated 5260 are not applicable.
systems and 10 minutes for noninsulated systems.
(b) It is the opinion of the Committee that, as an The system shall be maintained at nominal operating alternative to the 10-year system hydrostatic test re-pressure during performance of the VT-2 visual ex-quired by Table IWC-2500-1, Category C-H, the fol-amination.
lowing rules shall be used.
(4) The VT-2 visual examination shall include (1) A system pressure test shall be conducted at all components within the boundary identified in or near the end of each inspection interval or during (c)(2) above.
the same inspection period of each inspection inter-(5) Test instrumentation requirements of IWA-val of Inspection Program B.
5260 are not applicable.
849 SUPP. 9 - NC
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