Regulatory Guide 1.137: Difference between revisions

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{{Adams
{{Adams
| number = ML003740180
| number = ML12300A122
| issue date = 10/31/1979
| issue date = 06/07/2013
| title = Fuel-Oil Systems for Standby Diesel Generators
| title = Fuel Oil Systems for Emergency Power Supplies
| author name =  
| author name =  
| author affiliation = NRC/RES
| author affiliation = NRC/RES
Line 9: Line 9:
| docket =  
| docket =  
| license number =  
| license number =  
| contact person =  
| contact person = Orr M
| document report number = RG-1.137, Rev 1
| case reference number = DG-1282
| document report number = RG-1.137, Rev. 2
| package number = ML12300A089
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 3
| page count = 14
}}
}}
{{#Wiki_filter:U.S. NUCLEAR REGULATORY  
{{#Wiki_filter:U.S. NUCLEAR REGULATORY COMMISSION
COMMISSION
June 2013 OFFICE OF NUCLEAR REGULATORY RESEARCH
Revision 1 October 1979 REGULATORY  
Revision 2 REGULATORY GUIDE
GUIDE OFFICE OF STANDARDS
    Written suggestions regarding this guide or development of new guides may be submitted through the NRC's public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html.    Electronic copies of this regulatory guide and previous version of this guide and other recently issued guides are available through the NRC's public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/.  The regulatory guide is also available through the NRC's Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under Accession No. ML12300A122. The regulatory analysis may be found in ADAMS under Accession No. ML121090459 and the staff responses to the public comments on DG-1282 may be found under Accession No. ML12300A121.    REGULATORY GUIDE 1.137 (Draft was issued as DG-1282, dated July 2012 FUEL OIL SYSTEMS FOR EMERGENCY POWER SUPPLIES
DEVELOPMENT
REGULATORY  
GUIDE 1.137 FUEL-OIL SYSTEMS FOR STANDBY DIESEL GENERATORS


==A. INTRODUCTION==
==A. INTRODUCTION==
General Design Criterion
Purpose  This regulatory guide (RG) describes updated methods that the staff of the U.S. Nuclear Regulatory Commission (NRC) considers acceptable for use in complying with the NRC requirements regarding fuel oil systems for safety-related diesel powered generators and diesel oil-fueled gas turbine generators, including assurance of adequate fuel oil quality.  The guidance provided herein may also be applied to the fuel oil systems for nonsafety-related standby power supplies to the extent deemed appropriate to the safety significance of the power supplies.
17, "Electric Power Systems," of Appendix A, "General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50, "Domestic Licensing of Produc tion and Utilization Facilities," requires that an onsite elec tric power system and an offsite electric power system be provided to permit functioning of structures, systems, and components important to safety. In addition, Criterion
17 contains requirements concerning system capacity, capabil ity, independence, redundancy, availability, testability, and reliability.


Appendix B, "Quality Assurance Criteria for Nu clear Power Plants and Fuel Reprocessing Plants," to 10 CFR Part 50 establishes overall quality assurance requirements for the design, construction, and operation of structures, sys tems, and components important to safety. This regulatory guide describes a method acceptable to the NRC staff for complying with the Commission's regulations regarding fuel* oil systems for standby diesel generators and assurance of adequate fuel-oil quality. The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position.
Applicable Rules and Regulations The regulatory framework the NRC has established fo r nuclear power plants consists of a number of regulations and supporti ng guidelines applicable to the diesel and diesel-fueled gas turbine generators and their components in the onsite electric power system.  Title 10, of the Code of Federal Regulations , Part 50, "Domestic Licensing of Production and Utilization Facilities" (10 CFR Part 50) (Ref. 1), Appendix A, "General Design Criteria for Nuclear Power Plants," General Design Criteria (GDC) 17,
"Electric Power Systems," requires, in part, that an onsite electric power system be provided to permit functioning of structures, systems, and components (SSCs) important to safety.  GDC-17 also requires that the onsite electric power supplies shall have sufficient independence, redundancy, and testability to perform their safety functions assuming a single failure.  The onsite electrical power system includes standby power sources, distribution systems, and vital auxiliary supporting systems to supply power to SSCs important to safety.  When a commercial nuclear power plant uses diesel fueled generators as part of their standby power source for the onsite electric power system, the diesel fueled generators and related components, including the fuel oil, are classified as safety-related equipment.  The safety-related diesel fueled generators in the onsite electric power system are required to provide electric power to safety-related SSCs in the event of a postulated accident and, as such, are commonly referred to as emergency diesel generators (EDGs).     
 
In accordance with GDC-1, "Quality Standards and Records," safety-related equipment must have established quality st andards to provide adequate assurance that SSCs important to safety will satisfactorily perform their safety functions.  Appendix B, "Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants," to 10 CFR Part 50 describes criteria that must be met by a quality assurance program for SSCs that prevent or mitigate the consequences of postulated accidents.  The Rev. 2 of RG 1.137, Page 2 criteria of Appendix B apply to all activities that affect the safety-related functions of such SSCs, including activities such as designing, purchasing, installing, reviewing, testing, operating, maintaining, and modifying.
 
Furthermore, in 10 CFR 50.55a(a)(1), the NRC requires, in part, that systems and components be designed, fabricated, erected, tested, and inspected to quality standards commensurate with the safety function to be performed.  The regul ations in 10 CFR 50.55a(h) require that reactor protection and safety systems satisfy the criteria in the Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 603-1991, "IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations" (including a correction sheet dated January 30, 1995) (Ref. 2), or in IEEE Std. 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations" (Ref.
 
3).  The criteria in these IEEE standards requires, in part, that: "Safety system equipment shall be designed, manufactured, insp ected, installed, tested, operated, and maintained in accordance with a prescribed quality assurance program (ANSI/ASME NQA-l-1989)." 
Diesel fuel oil for the EDGs is a safety-related component of the EGDs.  As such, it is subject to the quality control requirements identified above.  Because diesel fuel oil is a safety-related component, it must be "-tested, and inspected to quality standards commensurate with the safety function to be performed."  Sampling the diesel fuel oil is one method of testing the safety-related component to verify that is it is capable of performing its design functio n. This regulatory guide endorses, in part, the sampling plan in American National Standards Institute (ANSI), American Nuclear Society (ANS) (ANSI/ANS) Standard 59.51-1997, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," (reaffirmed in October 2007), (Ref. 4) and American Society for Testing and Materials (ASTM) standard D975-13, "Standard Specification for Diesel Fuel Oils" (Ref. 5) as acceptable methods of verifying the quality of the fuel oil and fuel oil systems used in these safety-related applications at nuclear power plants.
 
Purpose of Regulatory Guides The NRC issues regulatory guides (RGs) to describe to the public methods that the staff considers acceptable for use in implementing specific parts of the agency's regulations, to explain techniques that the staff uses in evaluating specific problems or postulated accidents, and to provide guidance to applicants.  Regulatory guides are not substitutes for regulations and compliance with them is not required.  Methods and solutions that differ from those set forth in regulatory guides will be deemed acceptable if they provide a basis fo r the findings required for the issuance or continuance of a permit or license by the Commission.
 
Paperwork Reduction Act This RG contains information collection requirements covered by 10 CFR Part 50 and Part 52, "Licenses, Certifications, and Approvals for Nucl ear Power Plants" (Ref. 6) that the Office of Management and Budget (OMB) approved under OMB control numbers 3150-0011 and 3150-0151, respectively. The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number.
 
Rev. 2 of RG 1.137, Page 3


==B. DISCUSSION==
==B. DISCUSSION==
Working Group ANS-59.51 of Subcommittee ANS-50, Nu clear Power Plant Systems Engineering, of the American National Standards Committee NI8, Nuclear Design Cri teria, has prepared a standard that provides design require ments for the fuel-oil systems for standby diesel generators.
Reason for Change The NRC is issuing revision 2 of RG 1.137 to endorse portions of the updated industry consensus standard ANSI/ANS Std. 59.51-1997 and provide regulatory guidance on contemporary practices and related standards.


This standard was approved by the American National Stand ards Committee N18 and its Secretariat, and it was subse quently approved and designated ANSI N195-1976 by the American National Standards Institute on April 12, 1976. For proper operation of the standby diesel generators, it is necessary to ensure the proper quality of the fuel oil. Appen dix B to ANSI N195-1976 addresses the recommended fuel oil practices.
The NRC issued revision 1 of RG 1.137 in 1979 to endorse the guidance in ANSI Standard N195-1976, "Fuel Oil Systems for Standby Diesel-Generators" (Ref. 7) as a method acceptable to the NRC staff for complying with the Commission's regulations regarding fuel oil systems for standby diesel generators and assurance of adequate fuel oil quality. The ANSI standard was revised in 1989 to: (1) conform to revisions of ANSI/ANS-51.1, "American National Standards Nuclear Safety Criteria for the Design of Stationary Pressurized Water Reactor Plants," (Ref.


Although not a mandatory part of the stand ard, the staff believes Appendix B can serve as an accept able basis for a program to maintain the quality of fuel oil, as supplemented by regulatory position 2 of this guide. Lines indicate substantive changes from previous issu
8) (now withdrawn) and ANSI/ANS-52.1, "Nuclear Safety Criteria for the Design of Stationary Boiling Water Reactor Plants," (Ref. 9) (now withdrawn); and (2) to resolve comments from previous ballots issued in 1982 for reaffirmation, in 1985 for withdrawal, and then in 1986 for reaffirmation.  The standard underwent revision again in 1997 as ANSI/ANS-59.51-1997, with reaffirmation in October 2007.  However, the 2007 reaffirmation did not verify the contemporary practices or standards, and it is therefore incumbent on the user to verify the validity of the reference standards.


====e. USNRC REGULATORY ====
Background Proper quantity and quality of fuel oil is necessary for reliable operation of the emergency diesel generators and gas turbine generators. Appendix C, "Recommended Fuel Oil Practices" to ANSI/ANS-59.51-1997, addresses recommended practices for maintaining fuel oil quantity and quality.  Although not a mandatory part of the ANSI/ANS standard, the NRC staff believes Appendix C serves as an acceptable basis for a program to maintain the quality of fuel oil, with additions, deletions, and clarifications as contained in Section C, "Staff Regulatory Guidance" of this guide.
GUIDES Regulatory Guides are issued to describe and make available to the public methods acceptable to the NRC staff of Implementing specific parts of the Commission's regulations, to delineate tech niques used by the staff In evaluating specific problems or postu lated accidents, or to provide guidance to applicants.


Regulatory Guides are not substitutes for regulations, and compliance with them Is not required.
The majority of the guidance provided herein relates to the reliability and availability of the fuel oil storage and transfer system and is equally applicable to both diesel engines and gas turbines.  However, the required fuel oil quality of a gas turbine may differ somewhat from that of a diesel engine.  The gas turbine manufacturer's recommendations, as well as emission standards specific to gas turbines, should determine the requirements for gas turbine fuel quality.  Regardless of the fuel quality provided for gas turbine performance and emissions, the level of fuel oil storage and transfer system reliability and availability should be maintained consistent with the guidance provided herein.


Methods and solutions different from those set out in the guides will be acceptable If they provide a basis for the findings requisite to the issuance or continuance of a permit or license by the Commission.
Harmonization with International Standards The International Atomic Energy Agency (IAEA) has established a series of safety guides and standards constituting a high level of safety for protecting people and the environment.  IAEA safety guides identify international good practices and strive to reflect the best practices to help users striving to achieve high levels of safety.  Pertinent to this regulatory guide, IAEA Safety Guide No. NS-G-1.8, "Design of Emergency Power Systems for Nuclear Power Plants" (Ref. 10) issued August 2004, contains general guidance on the storage and testing of fuel and other depletable substances.  This regulatory guide incorporates similar guidelines and is consistent with the basic safety principles described in IAEA safety standard NS-G-1.8.


Comments and suggestions for improvements in these guides are encouraged at all times, and guides will be revised, as appropriate, to accommodate comments and to reflect new Information or experience.
Rev. 2 of RG 1.137, Page 4 Standards Endorsed in this Guide This regulatory guide endorses, in part, the use of one or more codes or standards developed by external organizations, and other third party guidance documents.  These codes, standards and third party guidance documents may contain references to other codes, standards or third party guidance documents ("secondary references").  If a secondary reference has itself been incorporated by reference into NRC regulations as a requirement, then licensees and applicants must comply with that standard as set forth in the regulation.  If the secondary reference has been endorsed in a regulatory guide as an acceptable approach for meeting an NRC requirement, then the standard constitutes a method acceptable to the NRC staff for meeting that regulatory requirement as described in the specific regulatory guide.  If the secondary reference has neither been incorporated by reference into NRC regulations nor endorsed in a regulatory guide, then the secondary reference is neither a legally-binding requirement nor a "generic" NRC approval as an acceptable approach for meeting an NRC requirement.  However, licensees and applicants may consider and use the information in the secondary reference, if appropriately justified and consistent with applicable NRC requirements.


This guide was revised as a result of substantive com ments received from the public and additional staff review.C. REGULATORY  
C. STAFF REGULATORY GUIDANCE
POSITION 1. The requirements for the design of fuel-oil systems for diesel generators that provide standby electrical power for a nuclear power plant that are included in ANSI N 195 1976, "Fuel Oil Systems for Standby Diesel-Generators," 1 provide a method acceptable to tile NRC staff for comply ing with the pertinent requirements of General Design Criterion
17 of Appendix A to 10 CFR Part 50, subject to the following:
a. Throughout ANSI N195-1976, other documents required to be included as part of the standard are either identified at the point of reference or described in Section 7.4, "Applicable Codes, Standards, and Regulations," or in Section 11, "References," of the standard.


The specific ac ceptability of these listed documents has been or will be addressed separately in other regulatory guides or in Com mission regulations, where appropriate.
The NRC endorses, in part, the requirements for the design and testing of EDG fuel oil and fuel oil systems used in safety-related applications at nuclear power plants as described in ANSI/ANS-59.51-
1997, and ASTM standard D975-13.  These standards have an adequate technical basis based on established standards and provide a method acceptable to the NRC staff for complying with the pertinent NRC requirements in 10 CFR Part 50 for safety-related EDGs, subject to the clarifications and modifications described in this section.


b. Section 1, "Scope," of ANSI N195-1976 states that the standard provides the design requirements for the fuel-oil system for standby diesel generators and that it sets forth other specific design requirements such as safety class, materials, physical arrangement, and applicable codes and regulations.
1. Throughout ANSI/ANS-59.51-1997, other documents required to be included as part of the standard are either identified at the point of reference or described in Section 6.1, "Safety Classification and Applicable Codes, Standards, and Regulations," or in Section 7, "References," of the standard.  Some of these documents have been withdrawn by the issuing organization and the edition/revision indicated for most or all of the referenced documents are not current.  Except as specifically addressed in this RG, the edition/re vision of each code and standard stated in ANSI/ANS-59.51-1997 should be applied to the fuel oil system.


The standard does not specifically address quality assurance, and in this regard ANSI N195-1976 should be used in conjunction with Regulatory Guide 1.28, "Quality Assurance Program Requirements (Design and Construction)," which endorses ANSI N45.2-1977, "Quality Assurance Program Requirements for Nuclear Power Plants," for the design, construction, and mainten ance of the fuel-oil system. c. Section 5.4, "Calculation of Fuel Oil Storage Re quirements," of the standard sets forth two methods for the calculation of fuel-oil storage requirements.
2. The quality group classification for the fuel oil system up to the system interface with the diesel engine or gas turbine skid should be Quality Group C in accordance with RG 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants" (Ref. 11).  The seismic classification of the fuel oil system up to the diesel engine or gas turbine skid interface should be Seismic Category I in accordance with RG 1.29, "Seismic Design Classification" (Ref. 12).  


These two meth ods are (1) calculations based on the assumption that the diesel generator operates continuously for 7 days at its rated capacity, and (2) calculations based on the time-dependent
3. Section 1.1, "Scope," of ANSI/ANS-59.51-1997 st ates that the standard provides functional, performance, and initial design requirements for the fuel oil system for safety-related emergency diesel generators.  The standard does not specifically address quality assurance, and in this regard, ANSI/ANS-59.51-1997 should be used in conjunction with RG 1.28, "Quality Assurance Program Requirements (Design and Construction)" (Ref. 13), which endorses ANSI/ASME NQA-1for activities including the design, construction, and maintenance of the fuel oil system.
1Copies may be obtained from the American Nuclear Society, 555 North Kensington Avenue, La Grange Park, Illinois 60525.Comments should be sent to the Secretary of the Commission, U.S. Nuclear Regialatory Commission Washington, D.C. 20555, Attention:
Docketing and Service Branch.  The guides are issued in the following ten broad divisions:
1. Power Reactors 6. Products 2. Research and Test Reactors


===7. Transportation ===
4. ANSI/ANS-59.51-1997 requires, in part, that the onsite fuel oil storage capacity for each diesel generator be sufficient to operate the diesel gene rator following any design basis event either for 7 days or for the time required to replenish the fuel from sources outside the plant site, without Rev. 2 of RG 1.137, Page 5 interruption of the operation of the diesel generato r, whichever is longer. New reactor designs should provide independent 7 day storage capacity for each emergency power supply train diesel generator or gas turbine set. All safety-related emergency power supply fuel oil systems should include the full 7-day supply in the fuel oil supply tank and should assume that the supply cannot be replenished for at least 7 days following the d esign basis event. The 7 day allowance assumes sufficient offsite supplies are available for continuous replenishment for a mission time of at least 30 days credited in the plant safety analyses.   Pre-disaster agreements for fuel oil replenishment should be established in the event a natural calamity invokes widespread fuel shortages or results in extended outage of the transmission network. Furthermore, with sufficient warning that a disaster is approaching, temporary diesel tanks can provide extended running time, as disaster conditions can temporarily prevent access to the plant site for replenishment of fuel oil supplies.
3. Fuels and Materials Facilities
8. Occupational Health 4. Environmental and Siting 9. Antitrust and Financial Review 5. Materials and Plant Protection
10. General Copies of issued guides may be purchased at the current Government Printing Office price. A subscription service for future guides In spe cific divisions Is available through the Government Printing Office. Information on the subscription service and current GPO prices may be obtained by writing the U.S. Nuclear Regulatory Commission, Washington, D.C. 20555, Attention:
Publications Sales Manager.


loads of the diesel generator.
5. Section 5.4, "Calculation of Usable Fuel Oil Storage Requirements," of ANSI/ANS-59.51-1997 provides two methods for calculation of the required capacity for fuel oil storage.  The first calculation method is based on providing onsite storage for 7 days of continuous operation at the rated diesel generator capacity and requires an explicit allowance for fuel consumption during periodic testing.  Appendix B of ANSI/ANS-59.51-1997, "Alternate Calculation of Usable Fuel Oil Storage Capacity," although not a required appendix, provides the second method for calculation of fuel oil storage capacity requirements that bases the capacity on operation of the diesel generator or generators at the minimum required capacity, including the capacity to power the safety-related systems and components, for the plant condition that is most limiting for the calculation of such capacity.  In view of the varying plant conditions that may prevail during emergency situations and flexibility afforded to plant operators to manually add loads, the NRC
staff does not consider the time and load dependent method as acceptable for meeting the intent of onsite fuel oil storage requirements.


For the time-dependent load method, the minimum required capacity should include the capacity to power the engineered safety features.
The calculation for supply tank capacity should include the following considerations:
5.1. Provide for a 7-day usable volume in the fuel oil supply tank and should not assume any contribution from any other fuel oil system components, including the day or integral tanks, piping, valves, transfer pumps, strainers, and filters.


d. Section 7.3, "Physical Arrangement," of ANSI N195-1976 states that "the location of day tanks shall be as required by the diesel-engine manufacturer." In addition to this requirement, the physical location of the day tank relative to the engine and design of the engine fuel system should take into account such items as net positive suction head requirements and the potential need for electric fuel pumps powered from a reliable power supply to ensure that the diesel-generator unit can start automatically and attain the required voltage and frequency within acceptable limits and time.  e. Section 7.3 of ANSI N195-1976 states that the arrangement of the fuel-oil system "shall provide for inservice inspection and testing in accordance with ASME Boiler and Pressure Vessel Code, Section XI, 'Rules for Inservice In spection of Nuclear Power Plant Components.' " For those portions of the fuel-oil systems for standby diesel generators that are designed to Section III, Subsection ND of the Code, an acceptable method of meeting the requirements of Sec tion 7.3 is to ensure that the system arrangement would allow: (1) Pressure testing of the fuel-oil system to a pressure 1.10 times the system design pressure at 10-year intervals.
5.2. Account for the unusable volume of the fuel supply tank. This unusable volume is the volume below the elevation at which air in the tank can enter the suction piping or at which vortex effect could impact system performance.  The location of this suction connection should be at an elevation that prevents influx of particulates that could plug filters and strainers and should also consider the extent of accumulation of sludge over time based on the plant's maintenance program for the supply tank.


In the case of storage. tanks, recommendations of the tank vendor should be taken into account when estab lishing the test pressure.
5.3. Account for any reduced performance when using alternative fuels or changes in energy content of available fuel oil.


(2) A visual examination to be conducted during the pressure test for evidence of component leakages, structural distress, or corrosion.
5.4. Base storage capacity calculations on the limiting heat content of the fuel oil that is specified in plant procedures.


In the case of buried components, a loss of system pressure during the test constitutes evidence of component leakage.
6. Section 6.2.4, "Physical Arrangement," of ANSI/ANS-59.51-1997 states that "the location of day or integral tanks shall be as required by the diesel-engine manufacturer."  In addition to this requirement, the physical location of the day tank (relative to the engine and design of the engine fuel system, including gas turbine fuel oil systems) should take into account: 
6.1. Net positive suction head requirement of the pump fed from the day tank, if applicable, Rev. 2 of RG 1.137, Page 6
6.2. Potential need for electric fuel pumps powered from a reliable power supply to ensure that the diesel generator unit can start automatically and attains the required voltage and frequency within acceptable time, and
6.3. Assurance that flooding and other postulated hazards under design basis events will not cause system inoperability.  GDC 2, "Design Bases for Protection Against Natural Phenomena," has the following requirements - Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions.  The design bases for these structures, systems, and components shall reflect: (1) Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena and (3) the importance of the safety functions to be performed.


f. Section 7.3 of ANSI N195-1976 requires that adequate heating be provided for the fuel-oil system.  Assurance should be provided that the fuel oil can be sup plied and ignited at all times under the most severe environ mental conditions expected at the facility.
7. The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code, Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components" (Ref. 14), applies to fuel oil system components that are designed to ASME B&PV Code Section III.  ASME "Code for Operation and Maintenan ce of Nuclear Power Plants" (ASME OM Code) (Ref. 15), applies to the inservice testing of certain pumps and valves of the fuel oil system as described in Section ISTA-1100, "Scope," of the ASME OM Code.


This may be accomplished by use of an oil with a "cloud point" lower than the 3-hour minimum soak temperature
8. Section 6.2.4 of ANSI/ANS-59.51-1997 requires that adequate heating be provided for the fuel oil system.  Assurance should be provided that the fuel oil can be supplied and ignited at all times under the most severe environmental conditions expected at the facility.  The guidance provided in ASTM Std. D975-13, Note J, should be app lied, as needed, to ensure that reliable diesel generator and gas turbine generator operation and performance are maintained during low ambient temperature conditions.
2 expected at the site during the seasonal periods in which the oil is to be used, and/or by maintenance of the onsite fuel oil above the "cloud point" temperature.


g. Section 7.5, "Other Requirements," of the standard states that "protection against external and internal corro sion shall be provided" for the fuel-oil system. To amplify this requirement for buried supply tanks not located within a vault and other buried portions of the system, a protec tive coating and an impressed current-type cathodic protec tion system should be provided in accordance with NACE Standard RP-01-69 (1972 Revision), "Recommended  
9. Section 6.2.5, "Other Requirements," of ANSI/ANS-59.51-1997 states, in part, that "-protection shall be provided as required against external and internal corrosion, such as by coatings or cathodic protection, or both, in accordance with National Association of Corrosion Engineers (NACE) Standard RP0169-1983, 'Recommended Practice - Control of External Corrosion on Underground or Submerged Metallic Piping Systems'." (Ref. 16)  The NRC staff does not endorse the 1983 revision of this NACE standard.  However, applicants and licensees may find it useful.  If corrosion protection is required, coatings and cathodic protection should be provided as follows: 
2J.P. Doner, "A Predictive Study for Defining Limitin; Tempera tures and their Application in Petroleum Product Specifications," U.S.  Army, Mobility Equipment Research and Development Center, Coat ing and Chemical Laboratory, Aberdeen Proving Ground, Maryland, CCL Report No. 316.Practice-Control of External Corrosion on Underground or Submerged Metallic Piping Systems." 3 In addition, the impressed current-type cathodic protection system should be designed to prevent the ignition of combustible vapors or fuel oil present in the fuel-oil systems for standby diesel generators.
9.1. Internal coatings applied to the safety-related components of the fuel oil system should be safety-related coatings and the selection, application, qualification, inspection, and maintenance of the coatings should be in accordance with RG 1.54, "Service Level I, II, and III Protective Coatings Applied to Nuclear Power Plants" (Ref. 17), and ASTM
D5144-08e, "Use of Protective Coating Standards in Nuclear Power Plants" (Ref. 18).  Protective coatings for the safety-related components of the fuel oil system should be classified as Coating Service Level III per RG 1.54.  Tank interior coatings should not detach or dissolve and thereby impair the adequate and uninterrupted supply of fuel oil to the diesel generators.  Coatings should prevent tank corrosion products from contaminating and fouling filters, which could starve the diesel generator of the necessary Rev. 2 of RG 1.137, Page 7 fuel.  Any qualification of coatings should be done for the expected range of fuel sulfur content.


h. Section 7.5 of the standard includes requirements for fire protection for the diesel-generator fuel-oil system.  The requirements of Section 7.5 are not considered a part of this regulatory guide since this subject is addressed separately in more detail in other NRC documents.
9.2. External coatings should follow the requirements of NACE SP0169-2007, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," (Ref. 19)


Thus a commitment to follow this regulatory guide does not imply a commitment to follow the requirements of Section 7.5 concerning fire protection.
which is endorsed by the NRC staff in NUREG-1801, "Generic Aging Lessons Learned (GALL) Report" (Ref. 20), Section XI.M41, "Buried and Underground Piping and Tanks."  Section 5 of NACE SP0169-2007 contains a list of acceptable types of external coatings and the standards to which these coatings should comply.  With the exception of installations where it can be demonstrated that external corrosion control is not required (paragraphs 1.2.1-1.2.3 and section 3 of NACE SP0169-2007), paragraph 4.2.1 of NACE SP0169-2007 states, in part, "External corrosion control must be a primary consideration during the design of a piping system.  Materials selection and coatings are the first line of defense against external corrosion.  Because perfect coatings are not feasible, CP [cathodic protection] must be used in conjunction with coatings."
9.3. When provided, cathodic protection systems should be designed, operated, maintained and tested in accordance with NACE SP0169-2007.


2. Appendix B to ANSI N195-1976 should be used as a basis for a program to ensure the initial and continuing quality of fuel oil as supplemented by the following:
10. Section 6.2.5 of ANSI/ANS-59.51-1997 includes requirements for fire protection for the diesel generator fuel oil system.  The requirements of Section 6.2.5 are not endorsed by this RG because this subject is addressed separately in more detail in other NRC documents.  Thus a commitment to follow this RG does not imply a commitment to follow the requirements of Section 6.2.5 concerning fire protection. Fire protection for the fuel oil systems for diesel generators and gas turbine generators should be provided in accordance with RG 1.189, "Fire Protection for Nuclear Power Plants" (Ref. 21) and meet the requirements of Appendix R of 10 CFR Part 50.
a. The oil stored in the fuel-oil supply tank, and the oil to be used for filling or refilling the supply tank, should meet the requirements of Federal Fuel Oil Specification VV-F-800b (April 2, 1975); ASTM D975-77, "Standard Specification for Diesel Fuel Oils;" or the requirements of the diesel-generator manufacturer, if they are more restrict ive, as well as the fuel-oil total insolubles level specified in Appendix B to the standard.


The "cloud point" should be less than or equal to the 3-hour minimum soak temperature
11. Section 6.3.3, "Instrumentation and Controls," of ANSI/ANS-59.51-1997 provides requirements for controls, instrumentation and alarms.  The system should include sufficient instrumentation and alarms, both in the main plant control room and at each diesel generator or gas turbine generator local control panel, to permit operators to adequately monitor the fuel oil supply and the performance of the fuel oil system to ensure that the fuel oil system can continue to perform the required safety function during a design basis event.
2 or the minimum temperature at which the fuel oil will be maintained during the period of time that it will be stored.  If test results for viscosity or for water and sediment for fuel oil contained in the supply tanks exceed the limits specified in the applicable specification, the diesel should be considered inoperable.


Fuel oil contained in the supply tank not meeting remaining applicable specification require ments should be replaced in a short period of time (about a week). b. Prior to adding new fuel oil to the supply tanks, onsite samples of the fuel oil should be taken. As a mini mum, prior to the addition of new fuel, tests for the following properties should be conducted:
12. When conducting maintenance on fuel oil supply systems, licensees should ensure practices are consistent with manufacturer recommendations including the use of specialized tools and techniques.
(1) Specific or API gravity (2) Water and sediment (3) Viscosity Test results for the latter two tests should not exceed the limits specified in the applicable specification.


Analysis of the other properties of the fuel oil listed in the applicable specification should be completed within 2 weeks of the addition.
13. ANSI/ANS-59.51-1997, Appendix C, and ASTM D975-13, including Table 1, should be used as a basis for a program to ensure the initial and continuing quality of fuel oil as supplemented by the following: 
13.1. The reference in ANSI/ANS-59.51-1997 to ANSI/ASTM D2276-94 for periodic manual sampling of the stored fuel should be changed to ASTM D6217-11, "Standard Test Method for Particulate Contamination in Middle Distillate Fuels by Laboratory Filtration" (Ref. 22).  Test method ASTM D4057-06 (Reapproved in 2011), "Practice for Manual Sampling of Petroleum and Petroleum Products" (Ref. 23) should be used to collect fuel oil test samples of new fuel for analysis prior to adding the oil to the supply tank


c. The periodic sampling procedure for the fuel oil should be in accordance with ASTM D270-1975, "Standard Method of Sampling Petroleum and Petroleum Products." 4 3 Copies may be obtained from the National Association of Corro don Engineers, 2400 West Loop South, Houston, Texas 77027. 4 Also designated ANSI ZI1.33-1976.
====s.     ====
Rev. 2 of RG 1.137, Page 8
13.2. Appendix C to ANSI/ANS-59.51-1997 specifies that prior to the addition of fuel oil to the supply tank, the API gravity or specific gravity should be measured and should be within the ranges specified.  The test for API or specific gravity should be performed in accordance with ASTM D1298-12b, "Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method" (Ref. 24).    


Copies may be obtained from the American National Standards Institute, 1430 Broadway, New York, N.Y. 10018.1.137-2 d. Accumulated condensate should be removed from storage tanks on a quarterly basis or on a monthly basis when it is suspected or known that the groundwater table is equal to or higher than the bottom of buried storage tanks. e. Day tanks and integral tanks should be checked for water monthly, as a minimum, and after each operation of the diesel where the period of operation was 1 hour or longer. Accumulated water should be removed immediately.
13.3. Before adding new fuel oil to the supply tanks, onsite samples of the new fuel oil should be taken.  As a minimum, before the addition of new fuel, tests for the following properties should be conducted:
13.3.1. specific or API gravity, 13.3.2. water and sediment or clear and bright with proper color, 13.3.3. viscosity, and 13.3.4. flash point.


If it is suspected that water has entered the suction piping from the day or integral tank, the entire fuel-oil system between the day or integral tank and the injectors should be -flushed.
Test results for these properties should be in accordance with the limits specified in the applicable specification.  Analysis of the other properties listed in Table 1 of ASTM
D975-13 should be completed within 31 days of new fuel delivery, in accordance with ASTM D975-13 or ANSI/ANS-59.51-1997
13.4. Accumulated condensate should be removed from supply tanks on a monthly basis.


f. As a minimum, the fuel oil stored in the supply tanks should be removed, the accumulated sediment removed, and the tanks cleaned at 10-year intervals.
13.5. Day tanks and integral tanks should be checked for water monthly, as a minimum, and after each operation of the diesel where the period of operation was 1 hour or longer.  The presence of water should be verified in accordance with ASTM D2709-96 (Reapproved 2011), "Standard Test Method for Water and Sediment in Middle Distillate Fuels by Centrifuge" (Ref. 25), or ASTM D1796-11, "Standard Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)" (Ref. 26).  The level should not exceed the maximum specified in Table 1 of ASTM D975-13.  Accumulated water should be removed immediately.  If water ingress is suspected from the suction piping of the day tank or integral tank, then the entire fuel oil system between the day tank or integral tank and the injectors should be flushed with fresh fuel oil.


To preclude the intro duction of surfactants in the fuel system, this cleaning should be accomplished using sodium hypochlorite solutions or their equivalent rather than soap or detergents.
13.6. As a minimum, the fuel oil stored in the supply tanks should be removed, the accumulated sediment removed, the tanks cleaned, and the interior inspected at 10-year intervals.


g. If an event should occur that would require replenishment of fuel oil without the interruption of operation of the diesel generators, the method of adding fuel oil should be such as to minimize the creation of turbulence of the accumulated residual sediment in the bottom of the supply tank since stirring up this sediment during the addition of acceptable new incoming fuel has the potential of causing the overall quality of the fuel oil in the storage tank to become unacceptable.
Licensees should prevent the introduction of surfactants from soap and detergents into the system during cleaning.  Licensees should also be aware that using strong oxidizing


h. For those facilities having an impressed current-type cathodic protection system, cathodic protection surveillance should be conducted according to the following procedures:
cleaning agents (e.g. high concentrations of sodium hypochlorite) could release noxious fumes or cause uncontrolled chemical reactions and use the appropriate precautions if using these chemicals.  Other materials with cleaning properties equivalent to high concentrations of sodium hypochlorite can be used to clean fuel oil supply tanks.  NRC Information Notice (IN) 2002-07, "Use of Sodium Hypochlorite for Cleaning Diesel Fuel Oil Supply Tanks" (Ref. 27), discusses the potential problems related to the use of sodium hypochlorite solutions for cleaning diesel fuel oil supply tanks.
(1) At intervals not exceeding
12 months, tests should be conducted on each underground cathodic protec tion system to determine whether the protection is adequate.(2) The test leads required for cathodic protection should be maintained in such a condition that electrical measurements can be obtained to ensure the system is adequately protected.


(3) At intervals not exceeding
13.7. Licensees should add fuel oil carefully to the supply tank to avoid suspension of settled particles.  This prevents tainting the fuel supply with suspended material.
2 months, each of the cathodic protection rectifiers should be inspected.


(4) Records of each inspection and test should be maintained over the life of the facility to assist in evaluating the extent of degradation of the corrosion protection systems.
Rev. 2 of RG 1.137, Page 9
13.8. Efforts to monitor on-hand fuel supply must be diligent to ensure reliability and availability of the fuel oil system.  These include the aforementioned ASTM test procedures and biological cultures (for fungus and bacteria) in accordance with ASTM D6469-11 "Standard Guide for Microbial Contamination in Fuels and Fuel Systems" (Ref. 28). 
Fuel oil degradation during long term storage shows up as an increase in particulate, due mostly to oxidation.  The presence of particulate does not mean the fuel oil will not burn properly in a diesel engine.  The particulate can cause fouling of filters and fuel oil injection equipment, however, which can cause e ngine failure.  Particulate concentrations should be determined in accordance with ASTM D6217-11.
 
Recirculation (continuous) treatment systems can improve existing fuel quality, extend fuel life, and refresh stockpiles.  Such systems have the potential to remove water, remove solids (down to 2 micrometers), and discourage bacterial growth.  These systems can provide the following benefits:   
13.8.1. A representative sample of the treated fuel satisfies the licensee technical specification in relation to fuel quality and overall system availability, and   
13.8.2. The system conforms to the requirements in ANSI/ANS 59.51-1997.
 
13.9. Applicants for a license renewal should establish a program focused on managing loss of material due to general, pitting, crevice and microbiologically-influenced corrosion (MIC) and fouling that leads to corrosion of the fuel tank internal surfaces, as described in NUREG-1801, Section XI.M30, "Fuel Oil Chemistry."   
13.10. The NRC does not regulate emissions from emergency power supply drivers and consequently does not provide specific guidance for the level of sulfur in the fuel oil.  However if ultra-low-sulfur diesel (ULSD) (i.e., a maximum of 15 ppm sulfur) (S15) grade fuel oil is used, the oil stored in the fuel oil supply tank, and the oil to be used for filling or refilling the supply tank, should meet the requirements of ASTM D975-13 (because the use of ASTM D975-06 and some earlier editions do not address ULSD fuel) and the diesel generator or gas turbine manufacturer's requirements.  The process used to reduce sulfur may also change other properti es of diesel fuel.  The potential changes are expected to include lower energy content (of the order of 1% to 2%), different cetane number, greater tendency to form particulates in storage, lower lubricity, and reduced compatibility with gaskets, seals, and engine lubricating oil.  NRC IN 2006-22, "New Ultra-Low Sulfur Diesel Fuel Oil Could Adversely Impact Diesel Engine Performance"
(Ref. 29), describes some of the properties of ULSD fuel and the potential effects on engine performance.  Licensees should be aware of the potential impacts of ULSD and verify the quality and compatibility of the fuel in accordance with ASTM D975-13 and the supplements listed in this sectio
 
====n.      ====
13.11. Biologically based diesel fuels (also known as "biodiesel"), of any concentration, should be used with caution because of the uncertainty about the chemical and physical properties of the formulations and their potential impact on diesel performance and fuel oil system components.  This includes ethanol-fortified grades.  ASTM D975-13 considers blends with up to 5% biodiesel not to be a biodiesel grade.  Therefore, licensees should not assume that purchased diesel fuel is free of any biodiesel without verification by the supplier before adding new fuel oil to the supply tanks.  An oxidation stability Rev. 2 of RG 1.137, Page 10 issue is known to affect biodiesel fuel during long term storage.  This configuration would apply to nuclear power plants where the diesel fuel (that may contain a blend of
 
biodiesel) is stored for long periods of time.  NRC IN 2009-02, "Biodiesel in Fuel Oil Could Adversely Impact Diesel Engine Performance" (Ref. 30), identifies several potential problems associated with a 5% biodiesel (B5) and suggests actions to mitigate the problems.  Electric Power Research In stitute (EPRI) reports, "Plant Support Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators," dated December 2010 (Ref. 31), and "Plant Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators, Addendum: Fuel Storage Test and Contingency Plan," dated March 2011 (Ref. 32), provide information on the use of B5 fuel for emergency diesel generators.


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
Except in those cases in which the applicant proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of all (1) construction permit applications, (2) standard reference system preliminary design applications (PDA) or Type-2 final design applications (FDA-2), and (3) licenses to manufacture that are docketed after November 1, 1979, except those portions of a construction permit application that: a. Reference an approved standard reference system preliminary or final design (PDA or FDA) or an application for such approval.
The purpose of this section is to provide information on how applicants and licensees
1 may use this guide and information regarding the NRC's plans for using this regulatory guide.  In addition, it describes how the NRC staff complies with 10 CFR 50.109, "Backfitting" and any applicable finality provisions in 10 CFR Part 52, "Licenses, Certifications, and Approvals for Nuclear Power Plants." 
Use by Applicants and Licensees Applicants and licensees may voluntarily
2 use the guidance in this document to demonstrate compliance with the underlying NRC regulations.  Methods or solutions that differ from those described in this regulatory guide may be deemed acceptable if they provide sufficient basis and information for the NRC staff to verify that the proposed alternative demonstrates compliance with the appropriate NRC regulations.  Current licensees may continue to use guidance the NRC found acceptable for complying with the identified regulations as long as their current licensing basis remains unchanged. Licensees may use the information in this regulatory guide for actions which do not require NRC review and approval such as changes to a facility design under 10 CFR 50.59, "Changes, Tests, and Experiments."  Licensees may use the information in this regulatory guide or applicable parts to resolve regulatory or inspection issues.
 
Use by NRC Staff The NRC staff does not intend or approve any imposition or backfitting of the guidance in this regulatory guide.  The NRC staff does not expect any existing licensee to use or commit to using the guidance in this regulatory guide, unless the licensee makes a change to its licensing basis.  The NRC staff does not expect or plan to request licensees to voluntarily adopt this regulatory guide to resolve a generic regulatory issue.  The NRC staff does not expect or plan to initiate NRC regulatory action which would require the use of this regulatory guide.  Examples of such unplanned NRC regulatory actions include issuance of an order requiring the use of the regulatory guide, requests for information under 10 CFR 50.54(f) as to whether a licensee intends to commit to use of this regulatory guide, generic                                           
1  In this section, "licensees" refers to licensees of nuclear power plants under 10 CFR Parts 50 and 52; and the term "applicants," refers to applicants for licenses and permits for (or relating to) nuclear power plants under 10 CFR Parts 50 and 52, and applicants for standard design approvals and standard design certifications under 10 CFR Part 52.
 
2  In this section, "voluntary" and "voluntarily" means that the licensee is seeking the action of its own accord, without the force of a legally binding requirement or an NRC representation of further licensing or enforcement action.
 
Rev. 2 of RG 1.137, Page 11 communication, or promulgation of a rule requiring the use of this regulatory guide without further backfit consideration.
 
During regulatory discussions on plant specific operational issues, the staff may discuss with licensees various actions consistent with staff positions in this regulatory guide, as one acceptable means of meeting the underlying NRC regulatory requirement.  Such discussions would not ordinarily be considered backfitting even if prior versions of this regulatory guide are part of the licensing basis of the facility.  However, unless this regulatory guide is part of the licensing basis for a facility, the staff may not represent to the licensee that the licensee's failure to comply with the positions in this regulatory guide constitutes a violation.
 
If an existing licensee voluntarily seeks a license amendment or change and (1) the NRC staff's consideration of the request involves a regulatory issue directly relevant to this new or revised regulatory guide and (2) the specific subject matter of this regulatory guide is an essential consideration in the staff's determination of the acceptability of the licensee's request, then the staff may request that the licensee either follow the guidance in this regulatory guide or provide an eq uivalent alternative process that demonstrates compliance with the underlying NRC regulatory requirements. This is not considered backfitting as defined in 10 CFR 50.109(a)(1) or a violation of any of the issue finality provisions in 10 CFR Part 52.
 
Additionally, an existing applicant may be required to comply to new rules, orders, or guidance if 10 CFR 50.109(a)(3) applies.
 
If a licensee believes that the NRC is either using this regulatory guide or requesting or requiring the licensee to implement the methods or processes in this regulatory guide in a manner inconsistent with the discussion in this Implementation section, then the licensee may file a backfit appeal with the NRC in accordance with the guidance in NUREG-1409, "Backfitting Guidelines," (Ref. 33) and the NRC Management Directive 8.4, "Management of Facility-Specific Backfitting and Information Collection" (Ref. 34).   
 
Rev. 2 of RG 1.137, Page 12 REFERENCES
3  1. U. S. Code of Federal Regulations (CFR) "Domestic Licensing of Production and Utilization Facilities," Part 50, Chapter 1, Title 10, "Energy." 
 
2. Institute of Electrical and Electronic Engineers (IEEE), Standard 603-1991, "IEEE Standard Criteria for Safety Systems for Nuclear Generating Stations," Piscataway, NJ.
 
4   
3. IEEE, Std. 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations," Piscataway, NJ.
 
4. American National Standards Institute (ANSI), American Nuclear Society (ANS), ANSI/ANS-59.51-1997, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," with reaffirmation in October 2007, La Grange Park, IL.
 
5   
5. American Society for Testing and Materials (ASTM), Std. D975-13, "Standard Specification for Diesel Fuel Oils," West Conshohocken, PA.
 
6    6. CFR, "Licenses, Certifications, and Approvals for Nuclear Power Plants," Part 52, Chapter 1, Title 10, "Energy." 
 
7. ANS Standard N195-1976, "Fuel Oil Systems for Standby Diesel-Generators," La Grange Park, IL.    8. ANSI/ANS-51.1, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," (withdrawn) ANS, La Grange Park, IL.
 
9. ANSI/ANS-52.1, "Nuclear Safety Criteria for the Design of Stationary Boiling Water Reactor Plants," (withdrawn), ANS, La Grange Park, IL.
 
10. International Atomic Energy Agency (IAEA), Safety Guide NS-G-1.8, "Design of Emergency Power Systems for Nuclear Power Plants" issued August 2004, Vienna, Austria.
 
7                                             
3  Publicly available NRC published documents are available electronically through the NRC Library on the NRC's public Web site at: http://www.nrc.gov/reading-rm/doc-collections/.  The documents can also be viewed on-line or printed for a fee in the NRC's Public Document Room (PDR) at 11555 Rockville Pike, Rockville, MD; the mailing address is USNRC PDR, Washington, DC 20555; telephone 301-415-4737 or (800) 397-4209; fax (301) 415-3548; and e-mail pdr.resource@nrc.gov.    4  Copies of Institute of Electrical and Electronics Engineers (IEEE) documents may be purchased from the Institute of Electrical and Electronics Engineers Service Center, 445 Hoes Lane, PO Box 1331, Piscataway, NJ 08855 or through the IEEE's public Web site at http://www.ieee.org/publications_standards/index.html.    5  Copies of American Nuclear Society (ANS) standards may be purchased from the ANS Web site http://www.new.ans.org/store/; or by writing to: American Nuclear Society, 555 North Kensington Avenue, La Grange Park, Illinois 60526, U.S.A., Telephone 800-323-304
 
===4.      ===
6  Copies of American Society for Testing and Materials (ASTM) standards may be purchased from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959; telephone (610) 832-9585.  Purchase information is available through the ASTM Web site at http://www.astm.org.  7  Copies of International Atomic Energy Agency (IAEA) documents may be obtained through their Web site: WWW.IAEA.Org/ or by writing the International Atomic Energy Agency P.O. Box 100 Wagramer Strasse 5, A-1400
Vienna, Austria.  Telephone (+431) 2600-0, Fax (+431) 2600-7, or E-Mail at Official.Mail@IAEA.Org Rev. 2 of RG 1.137, Page 13
 
11. U.S. Nuclear Regulatory Commission (NRC), Regulatory Guide (RG) 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants," Washington, DC.
 
12. NRC, RG 1.29, "Seismic Design Classification," Washington, DC.
 
13. NRC, RG 1.28, "Quality Assurance Program Requirements (Design and Construction)," Washington, DC.
 
14. ASME, Boiler and Pressure Vessel (B&PV) Code, Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," New York, NY.
 
15. ASME, B&PV Code Section III,  "Code for Operation and Maintenance of Nuclear Power Plants" (ASME OM Code), New York, NY.
 
16. National Association of Corrosion Engineers, International (NACE), Standard RP0169-1983, "Recommended Practice - Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE International, Houston, TX.
 
8 
17. NRC, RG 1.54, "Service Level I, II, and III Pr otective Coatings Applied to Nuclear Power Plants," Washington, DC.
 
18. ASTM Std. D5144-08e, "Use of Protective Coating Standards in Nuclear Power Plants," West Conshohocken, PA.
 
19. NACE Std. SP0169-2007, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE International, Houston, TX.
 
20. NRC, NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Washington, DC.
 
21. NRC, RG 1.189, "Fire Protection for Nuclear Power Plants," Washington, DC.
 
22. ASTM Std. D6217-11, "Standard Test Method for Particulate Contamination in Middle Distillate Fuels by Laboratory Filtration," West Conshohocken, PA.
 
23. ASTM Std. D4057-06 (Reapproved in 2011), "Practice for Manual Sampling of Petroleum and Petroleum Products,"
West Conshohocken, PA.
 
24. ASTM Std. D1298-12b, "Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method" West Conshohocken, PA.
 
25. ASTM Std. D2709-96 (Reapproved 2011), "Standard Test Method for Water and Sediment in Middle Distillate Fuels by Centrifuge," West Conshohocken, PA.
 
8  Copies of NACE International standards may be purchased from NACE International, 1440 South Creek Drive, Houston, TX, 77084-4906; telephone (281) 228-6200 or (800) 797-6223; Fax: (281) 228-6300; E-mail: firstservice@nace.org
 
Rev. 2 of RG 1.137, Page 14
26. ASTM Std. D1796-11, "Standard Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)," West Conshohocken, PA.
 
27. NRC, Information Notice, (IN) 2002-07, "Use of Sodium Hypochlorite for Cleaning Diesel Fuel Oil Supply Tanks," Washington, DC.  (ADAMS Accession No. ML013450182) 
 
28. ASTM Std. D6469-11, "Standard Guide for Microbial Contamination in Fuels and Fuel Systems," West Conshohocken, PA.
 
29. NRC, IN 2006-22, "New Ultra-Low-Sulfur Diesel Fuel Oil Could Adversely Impact Diesel Engine Performance," Washington, DC.  (ADAMS Accession No. ML062710079) 
 
30. NRC, IN 2009-02, "Biodiesel in Fuel Oil Could Adversely Impact Diesel Engine Performance," Washington, DC. (ADAMS Accession No. ML083450280) 
31. Electric Power Research Institute (EPRI) Report, "Plant Support Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators," dated December 2010, Palo Alto, CA.
 
9  32. EPRI Report, "Plant Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators, Addendum: Fuel Storage Test and Contingency Plan," dated March 2011, Palo Alto, CA.
 
33. NRC, NUREG-1409, "Backfitting Guidelines," July 1990, Washington, DC.  (ADAMS Accession No. ML032230247)   


b. Reference an approved standard duplicate plant preliminary or fimal design (PDDA or FDDA). c. Reference parts of a base plant design qualified and approved for replication.
34. NRC, Management Directive 8.4, "Management of Facility-Specific Backfitting and Information Collection," Washington, DC.


d. Reference a plant design approved or under review for approval for manufacture under a Manufacturing License, or applications for such approval.1.137-3}}
9  Copies of Electric Power Research Institute (EPRI) documents may be obtained by contacting the Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94304, Telephone: 650-855-2000 or on-line at http://my.epri.com/portal/server.pt.}}


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Revision as of 07:10, 13 October 2018

Fuel Oil Systems for Emergency Power Supplies
ML12300A122
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Issue date: 06/07/2013
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DG-1282 RG-1.137, Rev. 2
Download: ML12300A122 (14)
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U.S. NUCLEAR REGULATORY COMMISSION

June 2013 OFFICE OF NUCLEAR REGULATORY RESEARCH

Revision 2 REGULATORY GUIDE

Written suggestions regarding this guide or development of new guides may be submitted through the NRC's public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html. Electronic copies of this regulatory guide and previous version of this guide and other recently issued guides are available through the NRC's public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/. The regulatory guide is also available through the NRC's Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under Accession No. ML12300A122. The regulatory analysis may be found in ADAMS under Accession No. ML121090459 and the staff responses to the public comments on DG-1282 may be found under Accession No. ML12300A121. REGULATORY GUIDE 1.137 (Draft was issued as DG-1282, dated July 2012 FUEL OIL SYSTEMS FOR EMERGENCY POWER SUPPLIES

A. INTRODUCTION

Purpose This regulatory guide (RG) describes updated methods that the staff of the U.S. Nuclear Regulatory Commission (NRC) considers acceptable for use in complying with the NRC requirements regarding fuel oil systems for safety-related diesel powered generators and diesel oil-fueled gas turbine generators, including assurance of adequate fuel oil quality. The guidance provided herein may also be applied to the fuel oil systems for nonsafety-related standby power supplies to the extent deemed appropriate to the safety significance of the power supplies.

Applicable Rules and Regulations The regulatory framework the NRC has established fo r nuclear power plants consists of a number of regulations and supporti ng guidelines applicable to the diesel and diesel-fueled gas turbine generators and their components in the onsite electric power system. Title 10, of the Code of Federal Regulations , Part 50, "Domestic Licensing of Production and Utilization Facilities" (10 CFR Part 50) (Ref. 1), Appendix A, "General Design Criteria for Nuclear Power Plants," General Design Criteria (GDC) 17,

"Electric Power Systems," requires, in part, that an onsite electric power system be provided to permit functioning of structures, systems, and components (SSCs) important to safety. GDC-17 also requires that the onsite electric power supplies shall have sufficient independence, redundancy, and testability to perform their safety functions assuming a single failure. The onsite electrical power system includes standby power sources, distribution systems, and vital auxiliary supporting systems to supply power to SSCs important to safety. When a commercial nuclear power plant uses diesel fueled generators as part of their standby power source for the onsite electric power system, the diesel fueled generators and related components, including the fuel oil, are classified as safety-related equipment. The safety-related diesel fueled generators in the onsite electric power system are required to provide electric power to safety-related SSCs in the event of a postulated accident and, as such, are commonly referred to as emergency diesel generators (EDGs).

In accordance with GDC-1, "Quality Standards and Records," safety-related equipment must have established quality st andards to provide adequate assurance that SSCs important to safety will satisfactorily perform their safety functions. Appendix B, "Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants," to 10 CFR Part 50 describes criteria that must be met by a quality assurance program for SSCs that prevent or mitigate the consequences of postulated accidents. The Rev. 2 of RG 1.137, Page 2 criteria of Appendix B apply to all activities that affect the safety-related functions of such SSCs, including activities such as designing, purchasing, installing, reviewing, testing, operating, maintaining, and modifying.

Furthermore, in 10 CFR 50.55a(a)(1), the NRC requires, in part, that systems and components be designed, fabricated, erected, tested, and inspected to quality standards commensurate with the safety function to be performed. The regul ations in 10 CFR 50.55a(h) require that reactor protection and safety systems satisfy the criteria in the Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 603-1991, "IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations" (including a correction sheet dated January 30, 1995) (Ref. 2), or in IEEE Std. 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations" (Ref.

3). The criteria in these IEEE standards requires, in part, that: "Safety system equipment shall be designed, manufactured, insp ected, installed, tested, operated, and maintained in accordance with a prescribed quality assurance program (ANSI/ASME NQA-l-1989)."

Diesel fuel oil for the EDGs is a safety-related component of the EGDs. As such, it is subject to the quality control requirements identified above. Because diesel fuel oil is a safety-related component, it must be "-tested, and inspected to quality standards commensurate with the safety function to be performed." Sampling the diesel fuel oil is one method of testing the safety-related component to verify that is it is capable of performing its design functio n. This regulatory guide endorses, in part, the sampling plan in American National Standards Institute (ANSI), American Nuclear Society (ANS) (ANSI/ANS) Standard 59.51-1997, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," (reaffirmed in October 2007), (Ref. 4) and American Society for Testing and Materials (ASTM) standard D975-13, "Standard Specification for Diesel Fuel Oils" (Ref. 5) as acceptable methods of verifying the quality of the fuel oil and fuel oil systems used in these safety-related applications at nuclear power plants.

Purpose of Regulatory Guides The NRC issues regulatory guides (RGs) to describe to the public methods that the staff considers acceptable for use in implementing specific parts of the agency's regulations, to explain techniques that the staff uses in evaluating specific problems or postulated accidents, and to provide guidance to applicants. Regulatory guides are not substitutes for regulations and compliance with them is not required. Methods and solutions that differ from those set forth in regulatory guides will be deemed acceptable if they provide a basis fo r the findings required for the issuance or continuance of a permit or license by the Commission.

Paperwork Reduction Act This RG contains information collection requirements covered by 10 CFR Part 50 and Part 52, "Licenses, Certifications, and Approvals for Nucl ear Power Plants" (Ref. 6) that the Office of Management and Budget (OMB) approved under OMB control numbers 3150-0011 and 3150-0151, respectively. The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number.

Rev. 2 of RG 1.137, Page 3

B. DISCUSSION

Reason for Change The NRC is issuing revision 2 of RG 1.137 to endorse portions of the updated industry consensus standard ANSI/ANS Std. 59.51-1997 and provide regulatory guidance on contemporary practices and related standards.

The NRC issued revision 1 of RG 1.137 in 1979 to endorse the guidance in ANSI Standard N195-1976, "Fuel Oil Systems for Standby Diesel-Generators" (Ref. 7) as a method acceptable to the NRC staff for complying with the Commission's regulations regarding fuel oil systems for standby diesel generators and assurance of adequate fuel oil quality. The ANSI standard was revised in 1989 to: (1) conform to revisions of ANSI/ANS-51.1, "American National Standards Nuclear Safety Criteria for the Design of Stationary Pressurized Water Reactor Plants," (Ref.

8) (now withdrawn) and ANSI/ANS-52.1, "Nuclear Safety Criteria for the Design of Stationary Boiling Water Reactor Plants," (Ref. 9) (now withdrawn); and (2) to resolve comments from previous ballots issued in 1982 for reaffirmation, in 1985 for withdrawal, and then in 1986 for reaffirmation. The standard underwent revision again in 1997 as ANSI/ANS-59.51-1997, with reaffirmation in October 2007. However, the 2007 reaffirmation did not verify the contemporary practices or standards, and it is therefore incumbent on the user to verify the validity of the reference standards.

Background Proper quantity and quality of fuel oil is necessary for reliable operation of the emergency diesel generators and gas turbine generators. Appendix C, "Recommended Fuel Oil Practices" to ANSI/ANS-59.51-1997, addresses recommended practices for maintaining fuel oil quantity and quality. Although not a mandatory part of the ANSI/ANS standard, the NRC staff believes Appendix C serves as an acceptable basis for a program to maintain the quality of fuel oil, with additions, deletions, and clarifications as contained in Section C, "Staff Regulatory Guidance" of this guide.

The majority of the guidance provided herein relates to the reliability and availability of the fuel oil storage and transfer system and is equally applicable to both diesel engines and gas turbines. However, the required fuel oil quality of a gas turbine may differ somewhat from that of a diesel engine. The gas turbine manufacturer's recommendations, as well as emission standards specific to gas turbines, should determine the requirements for gas turbine fuel quality. Regardless of the fuel quality provided for gas turbine performance and emissions, the level of fuel oil storage and transfer system reliability and availability should be maintained consistent with the guidance provided herein.

Harmonization with International Standards The International Atomic Energy Agency (IAEA) has established a series of safety guides and standards constituting a high level of safety for protecting people and the environment. IAEA safety guides identify international good practices and strive to reflect the best practices to help users striving to achieve high levels of safety. Pertinent to this regulatory guide, IAEA Safety Guide No. NS-G-1.8, "Design of Emergency Power Systems for Nuclear Power Plants" (Ref. 10) issued August 2004, contains general guidance on the storage and testing of fuel and other depletable substances. This regulatory guide incorporates similar guidelines and is consistent with the basic safety principles described in IAEA safety standard NS-G-1.8.

Rev. 2 of RG 1.137, Page 4 Standards Endorsed in this Guide This regulatory guide endorses, in part, the use of one or more codes or standards developed by external organizations, and other third party guidance documents. These codes, standards and third party guidance documents may contain references to other codes, standards or third party guidance documents ("secondary references"). If a secondary reference has itself been incorporated by reference into NRC regulations as a requirement, then licensees and applicants must comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a regulatory guide as an acceptable approach for meeting an NRC requirement, then the standard constitutes a method acceptable to the NRC staff for meeting that regulatory requirement as described in the specific regulatory guide. If the secondary reference has neither been incorporated by reference into NRC regulations nor endorsed in a regulatory guide, then the secondary reference is neither a legally-binding requirement nor a "generic" NRC approval as an acceptable approach for meeting an NRC requirement. However, licensees and applicants may consider and use the information in the secondary reference, if appropriately justified and consistent with applicable NRC requirements.

C. STAFF REGULATORY GUIDANCE

The NRC endorses, in part, the requirements for the design and testing of EDG fuel oil and fuel oil systems used in safety-related applications at nuclear power plants as described in ANSI/ANS-59.51-

1997, and ASTM standard D975-13. These standards have an adequate technical basis based on established standards and provide a method acceptable to the NRC staff for complying with the pertinent NRC requirements in 10 CFR Part 50 for safety-related EDGs, subject to the clarifications and modifications described in this section.

1. Throughout ANSI/ANS-59.51-1997, other documents required to be included as part of the standard are either identified at the point of reference or described in Section 6.1, "Safety Classification and Applicable Codes, Standards, and Regulations," or in Section 7, "References," of the standard. Some of these documents have been withdrawn by the issuing organization and the edition/revision indicated for most or all of the referenced documents are not current. Except as specifically addressed in this RG, the edition/re vision of each code and standard stated in ANSI/ANS-59.51-1997 should be applied to the fuel oil system.

2. The quality group classification for the fuel oil system up to the system interface with the diesel engine or gas turbine skid should be Quality Group C in accordance with RG 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants" (Ref. 11). The seismic classification of the fuel oil system up to the diesel engine or gas turbine skid interface should be Seismic Category I in accordance with RG 1.29, "Seismic Design Classification" (Ref. 12).

3. Section 1.1, "Scope," of ANSI/ANS-59.51-1997 st ates that the standard provides functional, performance, and initial design requirements for the fuel oil system for safety-related emergency diesel generators. The standard does not specifically address quality assurance, and in this regard, ANSI/ANS-59.51-1997 should be used in conjunction with RG 1.28, "Quality Assurance Program Requirements (Design and Construction)" (Ref. 13), which endorses ANSI/ASME NQA-1for activities including the design, construction, and maintenance of the fuel oil system.

4. ANSI/ANS-59.51-1997 requires, in part, that the onsite fuel oil storage capacity for each diesel generator be sufficient to operate the diesel gene rator following any design basis event either for 7 days or for the time required to replenish the fuel from sources outside the plant site, without Rev. 2 of RG 1.137, Page 5 interruption of the operation of the diesel generato r, whichever is longer. New reactor designs should provide independent 7 day storage capacity for each emergency power supply train diesel generator or gas turbine set. All safety-related emergency power supply fuel oil systems should include the full 7-day supply in the fuel oil supply tank and should assume that the supply cannot be replenished for at least 7 days following the d esign basis event. The 7 day allowance assumes sufficient offsite supplies are available for continuous replenishment for a mission time of at least 30 days credited in the plant safety analyses. Pre-disaster agreements for fuel oil replenishment should be established in the event a natural calamity invokes widespread fuel shortages or results in extended outage of the transmission network. Furthermore, with sufficient warning that a disaster is approaching, temporary diesel tanks can provide extended running time, as disaster conditions can temporarily prevent access to the plant site for replenishment of fuel oil supplies.

5. Section 5.4, "Calculation of Usable Fuel Oil Storage Requirements," of ANSI/ANS-59.51-1997 provides two methods for calculation of the required capacity for fuel oil storage. The first calculation method is based on providing onsite storage for 7 days of continuous operation at the rated diesel generator capacity and requires an explicit allowance for fuel consumption during periodic testing. Appendix B of ANSI/ANS-59.51-1997, "Alternate Calculation of Usable Fuel Oil Storage Capacity," although not a required appendix, provides the second method for calculation of fuel oil storage capacity requirements that bases the capacity on operation of the diesel generator or generators at the minimum required capacity, including the capacity to power the safety-related systems and components, for the plant condition that is most limiting for the calculation of such capacity. In view of the varying plant conditions that may prevail during emergency situations and flexibility afforded to plant operators to manually add loads, the NRC

staff does not consider the time and load dependent method as acceptable for meeting the intent of onsite fuel oil storage requirements.

The calculation for supply tank capacity should include the following considerations:

5.1. Provide for a 7-day usable volume in the fuel oil supply tank and should not assume any contribution from any other fuel oil system components, including the day or integral tanks, piping, valves, transfer pumps, strainers, and filters.

5.2. Account for the unusable volume of the fuel supply tank. This unusable volume is the volume below the elevation at which air in the tank can enter the suction piping or at which vortex effect could impact system performance. The location of this suction connection should be at an elevation that prevents influx of particulates that could plug filters and strainers and should also consider the extent of accumulation of sludge over time based on the plant's maintenance program for the supply tank.

5.3. Account for any reduced performance when using alternative fuels or changes in energy content of available fuel oil.

5.4. Base storage capacity calculations on the limiting heat content of the fuel oil that is specified in plant procedures.

6. Section 6.2.4, "Physical Arrangement," of ANSI/ANS-59.51-1997 states that "the location of day or integral tanks shall be as required by the diesel-engine manufacturer." In addition to this requirement, the physical location of the day tank (relative to the engine and design of the engine fuel system, including gas turbine fuel oil systems) should take into account:

6.1. Net positive suction head requirement of the pump fed from the day tank, if applicable, Rev. 2 of RG 1.137, Page 6

6.2. Potential need for electric fuel pumps powered from a reliable power supply to ensure that the diesel generator unit can start automatically and attains the required voltage and frequency within acceptable time, and

6.3. Assurance that flooding and other postulated hazards under design basis events will not cause system inoperability. GDC 2, "Design Bases for Protection Against Natural Phenomena," has the following requirements - Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these structures, systems, and components shall reflect: (1) Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena and (3) the importance of the safety functions to be performed.

7. The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components" (Ref. 14), applies to fuel oil system components that are designed to ASME B&PV Code Section III. ASME "Code for Operation and Maintenan ce of Nuclear Power Plants" (ASME OM Code) (Ref. 15), applies to the inservice testing of certain pumps and valves of the fuel oil system as described in Section ISTA-1100, "Scope," of the ASME OM Code.

8. Section 6.2.4 of ANSI/ANS-59.51-1997 requires that adequate heating be provided for the fuel oil system. Assurance should be provided that the fuel oil can be supplied and ignited at all times under the most severe environmental conditions expected at the facility. The guidance provided in ASTM Std. D975-13, Note J, should be app lied, as needed, to ensure that reliable diesel generator and gas turbine generator operation and performance are maintained during low ambient temperature conditions.

9. Section 6.2.5, "Other Requirements," of ANSI/ANS-59.51-1997 states, in part, that "-protection shall be provided as required against external and internal corrosion, such as by coatings or cathodic protection, or both, in accordance with National Association of Corrosion Engineers (NACE) Standard RP0169-1983, 'Recommended Practice - Control of External Corrosion on Underground or Submerged Metallic Piping Systems'." (Ref. 16) The NRC staff does not endorse the 1983 revision of this NACE standard. However, applicants and licensees may find it useful. If corrosion protection is required, coatings and cathodic protection should be provided as follows:

9.1. Internal coatings applied to the safety-related components of the fuel oil system should be safety-related coatings and the selection, application, qualification, inspection, and maintenance of the coatings should be in accordance with RG 1.54, "Service Level I, II, and III Protective Coatings Applied to Nuclear Power Plants" (Ref. 17), and ASTM

D5144-08e, "Use of Protective Coating Standards in Nuclear Power Plants" (Ref. 18). Protective coatings for the safety-related components of the fuel oil system should be classified as Coating Service Level III per RG 1.54. Tank interior coatings should not detach or dissolve and thereby impair the adequate and uninterrupted supply of fuel oil to the diesel generators. Coatings should prevent tank corrosion products from contaminating and fouling filters, which could starve the diesel generator of the necessary Rev. 2 of RG 1.137, Page 7 fuel. Any qualification of coatings should be done for the expected range of fuel sulfur content.

9.2. External coatings should follow the requirements of NACE SP0169-2007, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," (Ref. 19)

which is endorsed by the NRC staff in NUREG-1801, "Generic Aging Lessons Learned (GALL) Report" (Ref. 20),Section XI.M41, "Buried and Underground Piping and Tanks." Section 5 of NACE SP0169-2007 contains a list of acceptable types of external coatings and the standards to which these coatings should comply. With the exception of installations where it can be demonstrated that external corrosion control is not required (paragraphs 1.2.1-1.2.3 and section 3 of NACE SP0169-2007), paragraph 4.2.1 of NACE SP0169-2007 states, in part, "External corrosion control must be a primary consideration during the design of a piping system. Materials selection and coatings are the first line of defense against external corrosion. Because perfect coatings are not feasible, CP [cathodic protection] must be used in conjunction with coatings."

9.3. When provided, cathodic protection systems should be designed, operated, maintained and tested in accordance with NACE SP0169-2007.

10. Section 6.2.5 of ANSI/ANS-59.51-1997 includes requirements for fire protection for the diesel generator fuel oil system. The requirements of Section 6.2.5 are not endorsed by this RG because this subject is addressed separately in more detail in other NRC documents. Thus a commitment to follow this RG does not imply a commitment to follow the requirements of Section 6.2.5 concerning fire protection. Fire protection for the fuel oil systems for diesel generators and gas turbine generators should be provided in accordance with RG 1.189, "Fire Protection for Nuclear Power Plants" (Ref. 21) and meet the requirements of Appendix R of 10 CFR Part 50.

11. Section 6.3.3, "Instrumentation and Controls," of ANSI/ANS-59.51-1997 provides requirements for controls, instrumentation and alarms. The system should include sufficient instrumentation and alarms, both in the main plant control room and at each diesel generator or gas turbine generator local control panel, to permit operators to adequately monitor the fuel oil supply and the performance of the fuel oil system to ensure that the fuel oil system can continue to perform the required safety function during a design basis event.

12. When conducting maintenance on fuel oil supply systems, licensees should ensure practices are consistent with manufacturer recommendations including the use of specialized tools and techniques.

13. ANSI/ANS-59.51-1997, Appendix C, and ASTM D975-13, including Table 1, should be used as a basis for a program to ensure the initial and continuing quality of fuel oil as supplemented by the following:

13.1. The reference in ANSI/ANS-59.51-1997 to ANSI/ASTM D2276-94 for periodic manual sampling of the stored fuel should be changed to ASTM D6217-11, "Standard Test Method for Particulate Contamination in Middle Distillate Fuels by Laboratory Filtration" (Ref. 22). Test method ASTM D4057-06 (Reapproved in 2011), "Practice for Manual Sampling of Petroleum and Petroleum Products" (Ref. 23) should be used to collect fuel oil test samples of new fuel for analysis prior to adding the oil to the supply tank

s.

Rev. 2 of RG 1.137, Page 8

13.2. Appendix C to ANSI/ANS-59.51-1997 specifies that prior to the addition of fuel oil to the supply tank, the API gravity or specific gravity should be measured and should be within the ranges specified. The test for API or specific gravity should be performed in accordance with ASTM D1298-12b, "Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method" (Ref. 24).

13.3. Before adding new fuel oil to the supply tanks, onsite samples of the new fuel oil should be taken. As a minimum, before the addition of new fuel, tests for the following properties should be conducted:

13.3.1. specific or API gravity, 13.3.2. water and sediment or clear and bright with proper color, 13.3.3. viscosity, and 13.3.4. flash point.

Test results for these properties should be in accordance with the limits specified in the applicable specification. Analysis of the other properties listed in Table 1 of ASTM

D975-13 should be completed within 31 days of new fuel delivery, in accordance with ASTM D975-13 or ANSI/ANS-59.51-1997

13.4. Accumulated condensate should be removed from supply tanks on a monthly basis.

13.5. Day tanks and integral tanks should be checked for water monthly, as a minimum, and after each operation of the diesel where the period of operation was 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or longer. The presence of water should be verified in accordance with ASTM D2709-96 (Reapproved 2011), "Standard Test Method for Water and Sediment in Middle Distillate Fuels by Centrifuge" (Ref. 25), or ASTM D1796-11, "Standard Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)" (Ref. 26). The level should not exceed the maximum specified in Table 1 of ASTM D975-13. Accumulated water should be removed immediately. If water ingress is suspected from the suction piping of the day tank or integral tank, then the entire fuel oil system between the day tank or integral tank and the injectors should be flushed with fresh fuel oil.

13.6. As a minimum, the fuel oil stored in the supply tanks should be removed, the accumulated sediment removed, the tanks cleaned, and the interior inspected at 10-year intervals.

Licensees should prevent the introduction of surfactants from soap and detergents into the system during cleaning. Licensees should also be aware that using strong oxidizing

cleaning agents (e.g. high concentrations of sodium hypochlorite) could release noxious fumes or cause uncontrolled chemical reactions and use the appropriate precautions if using these chemicals. Other materials with cleaning properties equivalent to high concentrations of sodium hypochlorite can be used to clean fuel oil supply tanks. NRC Information Notice (IN) 2002-07, "Use of Sodium Hypochlorite for Cleaning Diesel Fuel Oil Supply Tanks" (Ref. 27), discusses the potential problems related to the use of sodium hypochlorite solutions for cleaning diesel fuel oil supply tanks.

13.7. Licensees should add fuel oil carefully to the supply tank to avoid suspension of settled particles. This prevents tainting the fuel supply with suspended material.

Rev. 2 of RG 1.137, Page 9

13.8. Efforts to monitor on-hand fuel supply must be diligent to ensure reliability and availability of the fuel oil system. These include the aforementioned ASTM test procedures and biological cultures (for fungus and bacteria) in accordance with ASTM D6469-11 "Standard Guide for Microbial Contamination in Fuels and Fuel Systems" (Ref. 28).

Fuel oil degradation during long term storage shows up as an increase in particulate, due mostly to oxidation. The presence of particulate does not mean the fuel oil will not burn properly in a diesel engine. The particulate can cause fouling of filters and fuel oil injection equipment, however, which can cause e ngine failure. Particulate concentrations should be determined in accordance with ASTM D6217-11.

Recirculation (continuous) treatment systems can improve existing fuel quality, extend fuel life, and refresh stockpiles. Such systems have the potential to remove water, remove solids (down to 2 micrometers), and discourage bacterial growth. These systems can provide the following benefits:

13.8.1. A representative sample of the treated fuel satisfies the licensee technical specification in relation to fuel quality and overall system availability, and

13.8.2. The system conforms to the requirements in ANSI/ANS 59.51-1997.

13.9. Applicants for a license renewal should establish a program focused on managing loss of material due to general, pitting, crevice and microbiologically-influenced corrosion (MIC) and fouling that leads to corrosion of the fuel tank internal surfaces, as described in NUREG-1801,Section XI.M30, "Fuel Oil Chemistry."

13.10. The NRC does not regulate emissions from emergency power supply drivers and consequently does not provide specific guidance for the level of sulfur in the fuel oil. However if ultra-low-sulfur diesel (ULSD) (i.e., a maximum of 15 ppm sulfur) (S15) grade fuel oil is used, the oil stored in the fuel oil supply tank, and the oil to be used for filling or refilling the supply tank, should meet the requirements of ASTM D975-13 (because the use of ASTM D975-06 and some earlier editions do not address ULSD fuel) and the diesel generator or gas turbine manufacturer's requirements. The process used to reduce sulfur may also change other properti es of diesel fuel. The potential changes are expected to include lower energy content (of the order of 1% to 2%), different cetane number, greater tendency to form particulates in storage, lower lubricity, and reduced compatibility with gaskets, seals, and engine lubricating oil. NRC IN 2006-22, "New Ultra-Low Sulfur Diesel Fuel Oil Could Adversely Impact Diesel Engine Performance"

(Ref. 29), describes some of the properties of ULSD fuel and the potential effects on engine performance. Licensees should be aware of the potential impacts of ULSD and verify the quality and compatibility of the fuel in accordance with ASTM D975-13 and the supplements listed in this sectio

n.

13.11. Biologically based diesel fuels (also known as "biodiesel"), of any concentration, should be used with caution because of the uncertainty about the chemical and physical properties of the formulations and their potential impact on diesel performance and fuel oil system components. This includes ethanol-fortified grades. ASTM D975-13 considers blends with up to 5% biodiesel not to be a biodiesel grade. Therefore, licensees should not assume that purchased diesel fuel is free of any biodiesel without verification by the supplier before adding new fuel oil to the supply tanks. An oxidation stability Rev. 2 of RG 1.137, Page 10 issue is known to affect biodiesel fuel during long term storage. This configuration would apply to nuclear power plants where the diesel fuel (that may contain a blend of

biodiesel) is stored for long periods of time. NRC IN 2009-02, "Biodiesel in Fuel Oil Could Adversely Impact Diesel Engine Performance" (Ref. 30), identifies several potential problems associated with a 5% biodiesel (B5) and suggests actions to mitigate the problems. Electric Power Research In stitute (EPRI) reports, "Plant Support Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators," dated December 2010 (Ref. 31), and "Plant Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators, Addendum: Fuel Storage Test and Contingency Plan," dated March 2011 (Ref. 32), provide information on the use of B5 fuel for emergency diesel generators.

D. IMPLEMENTATION

The purpose of this section is to provide information on how applicants and licensees

1 may use this guide and information regarding the NRC's plans for using this regulatory guide. In addition, it describes how the NRC staff complies with 10 CFR 50.109, "Backfitting" and any applicable finality provisions in 10 CFR Part 52, "Licenses, Certifications, and Approvals for Nuclear Power Plants."

Use by Applicants and Licensees Applicants and licensees may voluntarily

2 use the guidance in this document to demonstrate compliance with the underlying NRC regulations. Methods or solutions that differ from those described in this regulatory guide may be deemed acceptable if they provide sufficient basis and information for the NRC staff to verify that the proposed alternative demonstrates compliance with the appropriate NRC regulations. Current licensees may continue to use guidance the NRC found acceptable for complying with the identified regulations as long as their current licensing basis remains unchanged. Licensees may use the information in this regulatory guide for actions which do not require NRC review and approval such as changes to a facility design under 10 CFR 50.59, "Changes, Tests, and Experiments." Licensees may use the information in this regulatory guide or applicable parts to resolve regulatory or inspection issues.

Use by NRC Staff The NRC staff does not intend or approve any imposition or backfitting of the guidance in this regulatory guide. The NRC staff does not expect any existing licensee to use or commit to using the guidance in this regulatory guide, unless the licensee makes a change to its licensing basis. The NRC staff does not expect or plan to request licensees to voluntarily adopt this regulatory guide to resolve a generic regulatory issue. The NRC staff does not expect or plan to initiate NRC regulatory action which would require the use of this regulatory guide. Examples of such unplanned NRC regulatory actions include issuance of an order requiring the use of the regulatory guide, requests for information under 10 CFR 50.54(f) as to whether a licensee intends to commit to use of this regulatory guide, generic

1 In this section, "licensees" refers to licensees of nuclear power plants under 10 CFR Parts 50 and 52; and the term "applicants," refers to applicants for licenses and permits for (or relating to) nuclear power plants under 10 CFR Parts 50 and 52, and applicants for standard design approvals and standard design certifications under 10 CFR Part 52.

2 In this section, "voluntary" and "voluntarily" means that the licensee is seeking the action of its own accord, without the force of a legally binding requirement or an NRC representation of further licensing or enforcement action.

Rev. 2 of RG 1.137, Page 11 communication, or promulgation of a rule requiring the use of this regulatory guide without further backfit consideration.

During regulatory discussions on plant specific operational issues, the staff may discuss with licensees various actions consistent with staff positions in this regulatory guide, as one acceptable means of meeting the underlying NRC regulatory requirement. Such discussions would not ordinarily be considered backfitting even if prior versions of this regulatory guide are part of the licensing basis of the facility. However, unless this regulatory guide is part of the licensing basis for a facility, the staff may not represent to the licensee that the licensee's failure to comply with the positions in this regulatory guide constitutes a violation.

If an existing licensee voluntarily seeks a license amendment or change and (1) the NRC staff's consideration of the request involves a regulatory issue directly relevant to this new or revised regulatory guide and (2) the specific subject matter of this regulatory guide is an essential consideration in the staff's determination of the acceptability of the licensee's request, then the staff may request that the licensee either follow the guidance in this regulatory guide or provide an eq uivalent alternative process that demonstrates compliance with the underlying NRC regulatory requirements. This is not considered backfitting as defined in 10 CFR 50.109(a)(1) or a violation of any of the issue finality provisions in 10 CFR Part 52.

Additionally, an existing applicant may be required to comply to new rules, orders, or guidance if 10 CFR 50.109(a)(3) applies.

If a licensee believes that the NRC is either using this regulatory guide or requesting or requiring the licensee to implement the methods or processes in this regulatory guide in a manner inconsistent with the discussion in this Implementation section, then the licensee may file a backfit appeal with the NRC in accordance with the guidance in NUREG-1409, "Backfitting Guidelines," (Ref. 33) and the NRC Management Directive 8.4, "Management of Facility-Specific Backfitting and Information Collection" (Ref. 34).

Rev. 2 of RG 1.137, Page 12 REFERENCES

3 1. U. S. Code of Federal Regulations (CFR) "Domestic Licensing of Production and Utilization Facilities," Part 50, Chapter 1, Title 10, "Energy."

2. Institute of Electrical and Electronic Engineers (IEEE), Standard 603-1991, "IEEE Standard Criteria for Safety Systems for Nuclear Generating Stations," Piscataway, NJ.

4

3. IEEE, Std. 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations," Piscataway, NJ.

4. American National Standards Institute (ANSI), American Nuclear Society (ANS), ANSI/ANS-59.51-1997, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," with reaffirmation in October 2007, La Grange Park, IL.

5

5. American Society for Testing and Materials (ASTM), Std. D975-13, "Standard Specification for Diesel Fuel Oils," West Conshohocken, PA.

6 6. CFR, "Licenses, Certifications, and Approvals for Nuclear Power Plants," Part 52, Chapter 1, Title 10, "Energy."

7. ANS Standard N195-1976, "Fuel Oil Systems for Standby Diesel-Generators," La Grange Park, IL. 8. ANSI/ANS-51.1, "Fuel Oil Systems for Safety-Related Emergency Diesel Generators," (withdrawn) ANS, La Grange Park, IL.

9. ANSI/ANS-52.1, "Nuclear Safety Criteria for the Design of Stationary Boiling Water Reactor Plants," (withdrawn), ANS, La Grange Park, IL.

10. International Atomic Energy Agency (IAEA), Safety Guide NS-G-1.8, "Design of Emergency Power Systems for Nuclear Power Plants" issued August 2004, Vienna, Austria.

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3 Publicly available NRC published documents are available electronically through the NRC Library on the NRC's public Web site at: http://www.nrc.gov/reading-rm/doc-collections/. The documents can also be viewed on-line or printed for a fee in the NRC's Public Document Room (PDR) at 11555 Rockville Pike, Rockville, MD; the mailing address is USNRC PDR, Washington, DC 20555; telephone 301-415-4737 or (800) 397-4209; fax (301) 415-3548; and e-mail pdr.resource@nrc.gov. 4 Copies of Institute of Electrical and Electronics Engineers (IEEE) documents may be purchased from the Institute of Electrical and Electronics Engineers Service Center, 445 Hoes Lane, PO Box 1331, Piscataway, NJ 08855 or through the IEEE's public Web site at http://www.ieee.org/publications_standards/index.html. 5 Copies of American Nuclear Society (ANS) standards may be purchased from the ANS Web site http://www.new.ans.org/store/; or by writing to: American Nuclear Society, 555 North Kensington Avenue, La Grange Park, Illinois 60526, U.S.A., Telephone 800-323-304

4.

6 Copies of American Society for Testing and Materials (ASTM) standards may be purchased from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959; telephone (610) 832-9585. Purchase information is available through the ASTM Web site at http://www.astm.org. 7 Copies of International Atomic Energy Agency (IAEA) documents may be obtained through their Web site: WWW.IAEA.Org/ or by writing the International Atomic Energy Agency P.O. Box 100 Wagramer Strasse 5, A-1400

Vienna, Austria. Telephone (+431) 2600-0, Fax (+431) 2600-7, or E-Mail at Official.Mail@IAEA.Org Rev. 2 of RG 1.137, Page 13

11. U.S. Nuclear Regulatory Commission (NRC), Regulatory Guide (RG) 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants," Washington, DC.

12. NRC, RG 1.29, "Seismic Design Classification," Washington, DC.

13. NRC, RG 1.28, "Quality Assurance Program Requirements (Design and Construction)," Washington, DC.

14. ASME, Boiler and Pressure Vessel (B&PV) Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," New York, NY.

15. ASME, B&PV Code Section III, "Code for Operation and Maintenance of Nuclear Power Plants" (ASME OM Code), New York, NY.

16. National Association of Corrosion Engineers, International (NACE), Standard RP0169-1983, "Recommended Practice - Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE International, Houston, TX.

8

17. NRC, RG 1.54, "Service Level I, II, and III Pr otective Coatings Applied to Nuclear Power Plants," Washington, DC.

18. ASTM Std. D5144-08e, "Use of Protective Coating Standards in Nuclear Power Plants," West Conshohocken, PA.

19. NACE Std. SP0169-2007, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE International, Houston, TX.

20. NRC, NUREG-1801, "Generic Aging Lessons Learned (GALL) Report," Washington, DC.

21. NRC, RG 1.189, "Fire Protection for Nuclear Power Plants," Washington, DC.

22. ASTM Std. D6217-11, "Standard Test Method for Particulate Contamination in Middle Distillate Fuels by Laboratory Filtration," West Conshohocken, PA.

23. ASTM Std. D4057-06 (Reapproved in 2011), "Practice for Manual Sampling of Petroleum and Petroleum Products,"

West Conshohocken, PA.

24. ASTM Std. D1298-12b, "Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method" West Conshohocken, PA.

25. ASTM Std. D2709-96 (Reapproved 2011), "Standard Test Method for Water and Sediment in Middle Distillate Fuels by Centrifuge," West Conshohocken, PA.

8 Copies of NACE International standards may be purchased from NACE International, 1440 South Creek Drive, Houston, TX, 77084-4906; telephone (281) 228-6200 or (800) 797-6223; Fax: (281) 228-6300; E-mail: firstservice@nace.org

Rev. 2 of RG 1.137, Page 14

26. ASTM Std. D1796-11, "Standard Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)," West Conshohocken, PA.

27. NRC, Information Notice, (IN) 2002-07, "Use of Sodium Hypochlorite for Cleaning Diesel Fuel Oil Supply Tanks," Washington, DC. (ADAMS Accession No. ML013450182)

28. ASTM Std. D6469-11, "Standard Guide for Microbial Contamination in Fuels and Fuel Systems," West Conshohocken, PA.

29. NRC, IN 2006-22, "New Ultra-Low-Sulfur Diesel Fuel Oil Could Adversely Impact Diesel Engine Performance," Washington, DC. (ADAMS Accession No. ML062710079)

30. NRC, IN 2009-02, "Biodiesel in Fuel Oil Could Adversely Impact Diesel Engine Performance," Washington, DC. (ADAMS Accession No. ML083450280)

31. Electric Power Research Institute (EPRI) Report, "Plant Support Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators," dated December 2010, Palo Alto, CA.

9 32. EPRI Report, "Plant Engineering: Storage and Use of Low-Concentration (5%) Biodiesel Blends in Nuclear Plant Emergency Diesel Generators, Addendum: Fuel Storage Test and Contingency Plan," dated March 2011, Palo Alto, CA.

33. NRC, NUREG-1409, "Backfitting Guidelines," July 1990, Washington, DC. (ADAMS Accession No. ML032230247)

34. NRC, Management Directive 8.4, "Management of Facility-Specific Backfitting and Information Collection," Washington, DC.

9 Copies of Electric Power Research Institute (EPRI) documents may be obtained by contacting the Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94304, Telephone: 650-855-2000 or on-line at http://my.epri.com/portal/server.pt.


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