16-2029 11-15-16 page 1 ASME BPVc.m.l.ND-2015 56 An intermediate postweld heat treatment for this purpose is defined as a postweld heat treatment performed on a weld within a temperature range not lower than the minimum holding temperature range to which the weld shall be subjected during the final postweld heat treatment. 57 (a) Spot radiographing of a welded joint is recognized as an effective inspection tool. The spot radiography rules are also considered to be an aid to quality control. Spot radiographs made directly after a welder or an operator has completed a unit of weld proves that the work is or is not being done in accordance with a satisfactory procedure. If the work is unsatisfactory, corrective steps can then be taken to improve the welding in the subsequent units, which unquestionably will improve the weld quality. (b) Spot radiography in accordance with these rules will not insure a fabrication product of predetermined quality level throughout. It must be realized that an accepted vessel or tank under these spot radiography rules may still contain defects that might be disclosed on further examination. If all radiographically disclosed unacceptable weld defects are required to be eliminated from a vessel or tank, then 100% radiography shall be employed. 58 SNT-TC-1A is a Recommended Practice for Nondestructive Testing Personnel Qualification and Certification published by the American Society for Nondestructive Testing, 1711 Arlingate Lane, P.O. Box 28518, Columbus, OH 43228-0518. 59 Personnel qualified by examination and certified to previous editions ofsnt-tc-1a are considered to be qualified to the edition referenced in Table NCA-7100-2 when the recertification is based on continuing satisfactory performance. All reexaminations and new examinations shall be in accordance with the edition referenced in Table NCA-7100-2. 60 Employer, as used in this Article, shall include: N Certificate Holders; Quality System Certificate Holders; and Material Organizations that are qualified in accordance with NCA-3842; and organizations that provide subcontracted nondestructive examination services to organizations described above. 61 These tests may be made with the item being tested partially filled with liquid, if desired. 62 Temperature fluctuations within the piping system may affect the pressure. Precautions must be taken to ensure that the test is not biased by temperature effects. 63 Wherever the word system appears in this Article, it refers to the component or group of components for which overpressure protection is provided as described in the Overpressure Protection Report. 64,65,67-73 delete, mark "not 64 A pressure relief device is designed to open to prevent a rise of internal fluid pressure greater than a specified value, resulting from exposure to pressure transient conditions. It may also be designed to prevent excessive internal vacuum. It may be a pressure relief valve, a nonreclosing pressure relief device, or a vacuum relief valve. 65 A pressure relief valve is a pressure relief device that is designed to reclose and prevent the further flow of fluid after normal conditions have been restored. 66 A vacuum relief valve is a pressure relief device designed to admit fluid to prevent an excessive internal vacuum; it is designed to reclose and prevent further flow of fluid after normal conditions have been restored. 67 A nonrec/osing pressure relief device is a pressure relief device designed to remain open after operation. 68 A safety valve is a pressure relief valve actuated by inlet static pressure and characterized by rapid opening or pop action. 69 A safety relief valve is a pressure relief valve characterized by rapid opening or pop action, or by opening generally proportional to the increase in pressure over the opening pressure. 70 A relief valve is a pressure relief valve actuated by inlet static pressure and having a gradual lift generally proportional to the increase in pressure over the opening pressure. 71 A pilot operated pressure relief valve is a pressure relief valve in which the majo r relieving device is combined with and controlled by a self-actuated auxiliary pressure relief valve. 72 A power actuated pressure relief valve is a pressure relief valve in which the major relieving device is combined with and controlled by a device requiring an external source of energy. 73 A rupture disk device is a nonreclosing pressure relief device actuated by inlet static pressure and designed to function by the bursting of a pressure containing disk. 286 Copyright 2015 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent cif ASME. *
16-2029 11-15-16 page 2 74, 75 move to ND-7311, 7321, mark "not ASME BPVC.III.1.ND-2015 74 Expected system pressure transient conditions are those associated with normal system transient operation. 75 Unexpected system pressure transient conditions are those associated with unusual or abnormal system transients, but still considered to be within the design basis. 76 A pressure relief valve that has no protrusions in the bore and wherein the valve disk lifts to an extent sufficient for the minimum area, at any section at or below the body seat, to become the controlling orifice. 77 The specified disk temperature supplied to the rupture disk manufacturer shall be the temperature ofthe disk when the disk is expected to burst 77 to ND-7612, mark "not 78 The manufacturing design range is a range of pressure within which the stamped burst pressure must fall. This range is included in the Design Specification and the Overpressure Protection Report. 79 A lot ofrupture disks is those disks manufactured of material at one time, of the same size, thickness, type, heat, and manufacturing process including heat treatment. 80 Valve capacities published in "Pressure Relief Device Certifications." This publication may be obtained from the National Board of Boiler and Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, OH 43229. 81 In lieu of marking all of the listed items on the flange or tab of each rupture disk, the marking may consist of a manufacturer's coding number sufficient to identify each rupture disk with a certificate or tab that includes the required information and is supplied with each lot of rupture disks. 79 to ND-7613, mark "not 81 to ND-7821, mark "not 287 Copyright 2015 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent of ASME. 8 III
16-2029 page 3, 11-15-16 ASME BPVC.III.1.ND-2015 (c) The addendum shall be certified by one or more Registered Professional Engineers competent in the applicable field of design and qualified in accordance with the requirements of Section III Appendices, Mandatory Appendix XXIII. ND-nso (b) When more than one device is used, no device shall have a capacity less than SO% of the device with the largest capacity. ND-7314 FILING OF REPORT Required Number and Capacity of Pressure Relief Devices for Isolatable Components Requiring Overpressure Protection A copy of the Overpressure Protection Report shall be filed at the nuclear power plant site prior to the Inspector The required relieving capacity for overpressure prosigning the Owner's Data Report. The report shall be tection of an isolatable component shall be secured by made available to the Authorized Inspector and the reguthe use of at least one pressure relief device meeting latory and enforcement authorities having jurisdiction at the requirements of ND-7S00 or ND-7600. the nuclear power plant site. ExpectedND-731S System Relieving Capacity of Vacuum Relief Pressure Transient Valves NO-7300 RELIEVING CAPACITY Conditions are those The capacity of each vacuum relief valve shall not be Delete note no. associated (a) REQUIREMENTS with normal less than that required to prevent a differential pressure system transient ND-7310 EXPECTED SYSTEM PRESSURE in excess of the value specified in the Design Specification. 74 operation TRANSIENT CONDITIONS (b) At least two independent vacuum relief valves shall be provided on each system. The capacity of each vacuum ND-7311 Relieving Capacity of Pressure Relief relief valve shall not be less than that required to protect Devices the system. (a) The total relieving capacity of the pressure relief de(c) Systems designed to withstand the maximum differvices (certified in accordance with ND-7700, intended for ential pressure do not require vacuum relief valves. Delete note overpressure protection within the scope of this Subsection, and credited in conformance with ND-7S00 or ND-7320 UNEXPECTED SYSTEM EXCESS ND-7600) shall take into account any losses due to fluid PRESSURE TRANSIENT CONDITIONS75 flow through piping and other components. ND-7321 Relieving Capacity of Pressure Relief (b) The total rated relieving capacity shall be sufficient Devices to prevent a rise in pressure of more than 10% or 3 psi, System whichever is greater, above the Unexpected Design Pressure of any (a) The total relieving capacity of the pressure relief deexcess Pressure component within the pressure-retaining boundary of vices (certified in accordance with ND-7700, intended for are the protected system under anytransient expected Conditions system presoverpressure protection within the scope of this Subsecthose associated with sure transient conditions as summarized in the Overprestion, and credited in conformance with ND-7S00 or unusual or abnormal sure Protection Report (ND-7200). ND-7600) shall take into account any losses due to fluid system transients, (c) The rated capacity of each vacuum relief valve shall flow through piping and other components. still considered to be not be less than that required tobut prevent a differential (b) The total rated relieving capacity shall be sufficient within the design basis. pressure in excess of the value specified in the valve Deto prevent a rise in pressure of more than 10% or 3 psi, sign Specification and in the Overpressure Protection whichever is greater, above the Design Pressure of any Report. component within the pressure-retaining boundary of the protected system under each of the unexpected sysnd-7312 Relieving Capacity of Pressure Relief tem excess pressure transient conditions specified in Devices Used With Pressure Reducing the Overpressure Protection Report. Devices ND-7322 When using pressure reducing devices, the combined relieving capacity of the pressure relief devices shall be sufficient to meet the requirements of ND-7311, when (a) pressure reducing devices and their bypass valves are fully open; and (b) all discharge paths are blocked on the low pressure side of the pressure reducing device. ND-731l Relieving Capacity of Vacuum Relief Valves (a) The capacity of each vacuum relief valve shall not be less than that required to prevent a differential pressure in excess of the value specified in the Design Specification of the system being protected. (b) At least two independent vacuum relief valves shall be provided on each system. The capacity of each vacuum relief valve shall not be less than that required to protect the system. (c) Systems designed to withstand the maximum differential pressure do not require vacuum relief valves. Required Number and Capacity of Pressure Relief Devices (a) Systems or components requiring individual protection may be served by one or more devices. 263 Copyright 2015 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent of ASME. no.
16-2029 page 4 11-15-16 ASME BPVC.III.1.ND 2015 ND-7550 VACUUM RELIEF VALVES ND-7564 ND-7551 General Requirements (a) Balanced self-actuating horizontally installed swinging disk valves. (b) Vertically installed vacuum disk or pallet-type valves. (c) All vacuum relief valves shall have provisions for adjustment of the differential pressure. A written procedure shall be prepared by the Certificate Holder and certified in accordance with the requirements of ND-7 563. The procedure shall specify all the test parameters that affect correlation and shall include, but not be limited to, the following: (a) specific description of test setup; (b) specific requirements for instrumentation; (c) specific requirements for assist equipment (if any); and (d) specific requirements for testing conditions, i.e., device temperature, ambient temperature, ambient pressure, etc. Test parameters shall be listed, i.e., time between openings, number of tests, etc. ND-7553 ND-7600 Vacuum relief valves shall meet the construction requirements applicable to Class 3 valves and the additional requirements of this Article. ND-7552 Types Permitted Operating Requirements Vacuum relief valves, which are operated by indirect means depending on an external energy source, such as electrical, pneumatic, or hydraulic systems, are not acceptable unless at least two independent external power operated valves and control systems are employed so that the required relieving capacity is obtained if anyone of the valves or systems should fail to operate. ND-7560 ALTERNATIVE TEST MEDIA ND-7561 General Requirements NONRECLOSING PRESSURE RELIEF DEVICES ND-7610 RUPTURE DISK DEVICES ND-7611 General Requirements Rupture disk devices certified in accordance with ND-7720 and ND-7750 are subject to the following: (a) Rupture disk devices may be used as the sole pressure relief device for services where release of the contents of the protected system is acceptable to the enforcement authority having jurisdiction at the nuclear power plant site; (b) Rupture disk devices may be used on the inlet side of pressure relief valves only when such valves are of the full bore 76 type (ND-7623); (c) Rupture disk devices may be used in conjunction with pressure relief valves on the outlet side (ND-7624). Pressure relief devices may be subjected to setpressure tests using a test medium (fluid or temperature) other than that for which they are designed, provided the testing complies with ND-7562 through ND-7564. Valves designed for steam service shall be tested with steam. Valves designed for compressible fluids shall be tested with a compressible fluid and valves designed for noncompressible fluids shall be tested with a noncompressible fluid. The specified disk temperature supplied to the ND-7562 Correlation rupture disk manufacturer shall bedevice the expected Correlation of pressure relief operation, with retemperature of thebedisk spect to the parameters under test, shall established when media, as compared with for the specified alternative the disk is expected to burst. the operating media conditions. CertificationAof Procedure lotcorrelation of rupture disks is those disksthat the correlation The Certificate Holder shall ensure of a will be of established in accordance manufactured with the procedure material at one ofdevice sufficient accuracy such that the pressuretime, relief same size, thickness, tested or adjusted, or both,the using the alternative media, type, heat, and will comply with the tolerance criteria. Results of the tests performed to verify the adequacy of the alternative manufacturing process test media correlation shall be including documented. heat treatment. Procedure ND-7612 Burst Pressure Tolerance The burst pressure tolerance at the specified disk temperature 77 shall not exceed ±2 psi (±15 kpa) for stamped burst pressure up to and including 40 psi (300 kpa) and ±S% for stamped burst pressure above 40 psi (300 kpa) as established by the rules of ND-7613, unless other values have been established in the Design Specification and are covered in the Overpressure Protection Report. Delete note nos. ND-7613 Tests to Establish Stamped Burst Pressure (a) Every rupture disk shall have a stamped burst pressure established by rules of ND-7612 within a manufacturing design range,78 at a specified disk temperature, and shall be stamped with a lot number. (b) Each lot of rupture disks shall be tested in accordance with one of the following methods. All tests of disks for a given lot shall be made in a holder of the same form and pressure area dimensions as that being used in service. ND-7563 267 Copyright 201 5 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent of ASME.
16-2029 page 5 11-15-16 ASME BPVC.III.l.ND-201S Pressure Relief Valves: (0) capacity lb/hr (kg/hr) of saturated steam or standard cu ft/min of air [60 F (20 C) and 14.7 psia (101 kpa)] (h) year built - lbjhr (kgjhr) of saturated steam for valves certified on steam, or ND-7822 (e) certified capacity and overpressure in percent or psi (kpa) in accordance with ND-7700 - sefm [standard cubic feet per minute (m 3 per hour)] at 60 F (15 C) and 14.7 psia (101 kpa) of air for valves certified on air or gas, or Disk Holders (If Used) Rupture disk holders shall be marked with the following: (a) name or identifying trademark of the manufacturer (b) manufacturer's design or type number (c) size _ in. (DN) (d) year built (e) serial number - gal/min (ljmin) of water at 70 F (20 C) for valves certified on water Vacuum Relief Valves - scfh (standard cubic feet per hour) at 60 F (15 C) and 14.7 psi (101 kpa) ND-7830 ND-7831 PRESSURE RELIEF VALVE IN COMBINATION WITH RUPTURE DISK DEVICES Marking When Capacity Is Approved in Accordance With ND-7762.1 (j) applicable official Certification Mark, as shown in Table NCA-8100-1 In addition to the above, each pressure relief valve shall have a separate nameplate attached to the component that includes the marking requirements of NCA-8220 and ND-3593.2. The marking shall be placed either on the valve or the rupture disk holder or on a plate or plates securely fastened to the valve or the rupture disk holder. The marking shall include a Combination Capacity Factor of 0.8. ND-7812 ND-7832 Report Form for Pressure and Vacuum Relief Valves A Data Report Form NV-l (Section III Appendices, Mandatory Appendix V) shall be filled out and signed by the Certificate Holder and signed by the Inspector for each pressure and vacuum relief valve stamped with the Certification Mark with NV Designator. ND-7820 ND-7821 Marking When Capacity Is Approved in Accordance With ND-7762.2 The following marking shall be in addition to the marking required by ND-7811 and ND-7822. The marking shall be placed on the valve or the rupture disk holder or on a plate or plates securely fastened to the valve or the rupture disk holder. The marking shall include the following: (a) name of the Certificate Holder (b) design or type or serial number of valve (c) name of manufacturer of rupture disk device (d) design or type designation of rupture disk device (e) approved Combination Capacity Factor RUPTURE DISK DEVICES Rupture Disks Every rupture disk shall be plainly marked by the manufacturer in such a way that the marking will not be obliterated in service. The rupture disk marking shall be placed on the flange of the rupture disk or on a metal tab permanently attached thereto. 81 The marking shall include the following: (a) name or identifying trademark of the manufacturer (b) manufacturer's design or type number (c) lot number (d) size _ in. (DN) (e) stamped bursting pressure psi (kpa) (j) specified disk temperature OF (OC) ND-7840 CERTIFICATE OF AUTHORIZATION TO USE CERTIFICATION MARK In lieu of marking all of the listed items Each pressure and vacuum relief valve within the scope on the flange or tab of each rupture of this Article shall be constructed by a Certificate Holder disk, the amarking may consist of anv Designator and a Certification Mark with possessing manufacturer s valid Certificate of Authorization. Pressure and vacuum coding number identify Mark with NV Certification relief valves shall sufficient have the to each rupture disk with a certificate or the rules of Designator applied in accordance with tab that includes the required ND-8100. information and is supplied with each lot of rupture disks. Delete note no. 280 Copyright 2015 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent of ASME.