ML19221B069
| ML19221B069 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-09.5.4, NUREG-75-87, NUREG-75-87-9.5.4, SRP-09.05.04, SRP-9.05.04, NUDOCS 7907120348 | |
| Download: ML19221B069 (7) | |
Text
n nec NUREG 75i087
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'S U.S. NUCLEAR REGULATORY COMMISSION
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STANDARD REVIEW PLAN 9
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OFFICE OF NUCLEAR REACTOR REGULATION SECTION 9.5.4 EMERGENCY DIESEL ENGINE FUEL OIL STORAGE A*tD TRANSFER SYSTEM REVIEW RESPCNSIBIt! TIES Primary - Power Systems Branch (PSB)
I Secondary - Auxiliary Systems Eranch ( ASB)
Structural Engineering Branch (SEB)
Mechanical Engineerir.g Branch (MEB)
Materials Engineering Branch (MTEB) 1.
AREAS OF REVIEW Nuclear power plants are raquired to have redundant onsite emergency power sources of sufficient capacity to power safety related equ pment.
In almost all cases, the i
ansite power sources include diesel engine-driven generator sets.
SRP sections numbered 9.5.4 through 9.5.8 cover the review of various essential elements of the emergency diesel engire sets.
This SRP Section 9.5.4 deals with the fuel oil storage and transfer system for these diesel engines up to the engine housing.
The PSB review of the emergency diesel engine fuel oil storaq and transfer system (EDEFSS) is performed to assure "cnformance with the requirements of General Design Criteria 2, 4, 5 and 17 and includes all piping up to the connection to the engine, the fuel oil storage tanks, the fuel oil transfer pumps, d3y tanks and the tank storage vaults.
In addition, the review includes the quality and the quantity of fuel oil stored on site, a,d the availability and procurement of additional fuel from offsite sources.
1.
The diesel engir.e fuel oil storage and transfer system is reviewed to determine that:
The system meets appropriate seismic design requirements.
a.
D.
The system will be designed, fabricated, erected, and tested to acceptable quality standards.
Suf ficient space has ')een provided to permit inspection, cleaning, c.
maintenance, and repair of the system.
d.
A minimum of seven days supply of fuel oil, for each redundant diesel generator system, has been provided onsite to meet the engineered safety feature load requirements following a Ivss of offsite power and a design basis accident.
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e.
Adequate and acceptahle sources of fuel oil are available, including the means of transporting and recharging the fuel storage tank, following a design basis accident (DBA) so as to enable each redundant diesel generator system to supply uninterrupted emergency power for as long as may be required.
f.
Seismic Category I structures housing the system protect it from natural phenomena and external missiles.
2.
The PSB verifies that suitable precautions will be taken to prevent deleterious l
material from degrading the stored fuel 3nd that periodic tests will be performed to verify that fuel degradation does not proceed to the point where engine performance is affected.
3.
The PSB will determine the adequacy of the design, installation, inspection and testing of all electrical components required for reliable operation of the syste, including interlocks.
4.
The applicant's proposed technical specifications are reviewed for operatir.g license applications as they relate to areas covered in this section.
The review of the diesel engine fuel oil storage and transfer system will involve secondary review evaluations performed by other branches.
Their evaluations are used by the PSB to complete the overall sy s t e'" evaluation. The evaluations performed by other branches are as follo s.
The SEB will determine the acceptability of the design analyses, procedures, and criteria used to establish the ability Jf structLres to withstand the effects of natural p'enomena such as the safe shutdown earthquake (SSE), the probable maximum flood (PMF), and tornada missiles. The MEB will review the seismic design qualification of components and confirm that components, piping, and structures are designed in accordance with applicable codes and stand 3rds.
The A5B will determine tnat the assigned seismic and quality group classifications for system components are acceptable. The A5B also determines that the EDEFSS is in accordance with Branch Technical Positions A5B 3-1 and MEB 3-1 for cracks and breaks in high energy and moderate ere ;j piping sy>tems outside containment. The MIEB will serify that inservice inspection requirements 3re met for system components and upon repest will verity the compatibility of the m3terials of construction with service conditions.
II.
ACCEPTANCE CRITERIA Acceptability of the diesel engine fuel oil storage and transfer system, as described in the applicant's safety analysis report (SAR), is based on specific general design criterie, regulatory guides and industry standards. The review will also utilize information obtained frcm other federal agencies and reports, industry standards, military specifications, available technical literature, and operational performance data obtained f rom similarly designed ;fstems at other plants having satisf actory operational experience.
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The design of the diesel engine fuel oil storage and transfer system is acceptable if the integrated design of the system is in accordance with the following criteria:
1.
General Design Criterion 2, as re!1ted to the ability of structures housing the system and the system itself to withstanJ the ef f ects of natural phenomena SLch as earthquakes, tornadoes, hurricanes, and floods, as established in Chapters 2 and 3 of the SAR.
2.
General Design Criterion 4, with respect to structures housing the system and the system itself being c'pable of withstanding the effects of external missiles and internally generated missiles, pipe whip. and jet impingement forces associated with pipe breaks.
3.
General Design Criterion 5, as related to the capability of shared systems and components i.portant to safety to perform required safety functions.
4.
General Design Criterion 17, as related to the capability of the fuel oil system to meet independence and redund3ncy criteria.
5.
Regulatory Guide 1.26, as related to quality group classification of the system components.
6.
Regulatory Guide 1.29, as related to the seismic design classification of the system.
7.
Regulatory Guide 1.68, as related to preoperational and startup testing of the diesel engine fuel oil storaqa and transfer system 8.
Regulatory Guide 1.102, as related to the protection of structures, systems and components important to safety from the effects of flooding.
9.
Regulatory Guide 1.117, as related to the protection of structures, systems and components important to safety from the effects of torn 3do missiles.
10.
Regulatory Guide 1.137, as related to fuel oil systems design, fuel oil quality and tests.
11.
Branch Technical Position ASE 3.5-1, as related to fuel oil system fire protection.
12.
ANSI Standard N195, " Fuel Oil Systems for Standby Diesel Senerators."
13.
Branch Technical Positions ASB 3-1 and MEB 3-1, ra'=ted to breaks in high and moderate energy piping systems outside containment.
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9.5.4-3 Fev. 1
14.
Branch Technical Position ICSB-17 (PSB), as related to diesel engine fuel oil system protective interlocks during accident conditions.
fo-those areas of review identified in subsection I of this SRP section as being the responsibility of other branches, the acceptance criteria and their methods of application are contained in the SRP sections corresponding to those branches.
!!I. REVIEW PROCEDURES The procedures below are used during the construction permit (CP) review to determine that the design criteria and bases and the preliminary design meet the acceptance criteria given in Section II.
For the review of operating license (OL) applications, the procedures are used to verify that the initial design cr:teria and bases have tieen appropriately implemented in the final design.
The OL review includes verification that the content and intent of the technical specifications prepared by the applicant are in agreement with requirements for system testing, minimum performance, and surveillance developed as a result of the staff's review.
Plant-to plant variations in the design of fuel oil storage and transfer systems will occur due to the number of architect engineering ampanies t.aving design responsibility in this area.
Differences may occur in the number of redundant systems, in piping interconnections between diesel engines, and in sharing requirements between units.
The reviewer will select and emphasize material from the paragraphs below to fit the particular design under review.
Upon request from the primary reviewer, the secondary review branches will provide input for the areas of re,'iew stated in subsection I.
The primary reviewer obtains and uses such input as required to assure that this review procedure is complete.
1.
The SAR is reviewed to verify that the diesel engine fuel oil storage and transfer system description and related diagrams clearly indicate all modes of system operation, including the means for indicating, controlling, and monitorir.q fuel oil level, temperature, and pressure as required for unint$rrupted operation.
2.
The reviewer verifies that the system is designed to withstand the effects of seismic events, other design basis, natural phenoTena, and internally-and externally generated missiles. The re view of internally generated missiles will consider the relative locations and oriertation of components as placed in the facility.
3.
Piping and interconnections between 50 stems are reviewed to verify that single actite failures will not cause unacc?ptable results. The associated drawings are examined to ascertain that sufficient space has been provided around the components to permit inspection, cleaning, m3inten mce, and repair.
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4 The reviewer verifies that the design is such as to minimize the chance of deleterious raterial entering the syste during recharging, or by operator err or, or due to na tural phenomena. The reviewer will ascertain that provisicns or a progran have been incorporated to assure that the quality of the stored fuel oil r eets minirum rer.uirerents at all tires.
5.
The descriptive inferration and drtwine,s in the SM are reviewed to verify tnt:
a, Each storage tank is equipned with an outside fill and vent line, located so as to rini-ize the chance of danaqe, and with the fill and vent point higher th3n the FMF flood level, b.
The miniou onsite inventory of fuel oil for each redundant diesel generator syster is suf ficient to enable the diesel generators to power required engineerod safety features for a period of seven days following m.ny design basis ac ident and ioss of offsite p]wer.
c.
The day or integral tank associated with each diesel gerieratnr set is located at an elevation to assure a slight positive pres < ure at the engine fuel purps.
d.
A day cr integral tank overflow line is provided to return excess fuel oil delivered by the transfer punp back to the fuel oil storage tank.
e.
A low level alarm is provided to enable the c;erator to accorplish rinor repairs or raintenance before all fuel in the day or integral tank is consured (t suning full power operation).
6.
The r' viewer verifies that suitable precautions will be taken, once the fuel oil l
tank has been filled. to exclude soJrces of ignition such as open fla es or hot surfaces, and that protective reasures such as co partrentation of redundant cle ents are used to mininize the potential causes and consequences of fires and explosions.
7.
The reviewer verifies that the systen function will be raintained as required in the event of failure of non-seismic Category I syste s or structures located near the systen. Feference to the SAR sections describing site features and the general arrangerent and layout drawings will be necessary in this determiration.
Plant arrangerent features, in conjunction with the protection obtained by lccation and the design of the system and tructures, are considered in deterrining tre ability of the systen to raintain function in the event of Mch failures.
8.
The diesei engine fuel oil storage and transfer systen is reviewed to verify that protection from the effects of breaks in high and roderate energy lines has been provided. Layout drawings are reviewed to assure that no high or roderate energy piping systers are located close to the fuel oil syst e, or t.at protection from the effects of failure will be provided. The reans of providing such protection will be given in Section 3.6 of the SAR and the procedures for reviewing this inforration are given in the corresponding SRP sections.
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9.
The descriptive information, related system drawings, and the results of failure modes and effects analyses in the SAR are reviewed to verii, that minimum system requirements will be met following design basis accidents assuming a concurrent single attive corrponent f ailure. For each case the des Nn will be acceptable if minimum system requirements are met.
IV.
EVALUATION FINDINGS The reviewer verifies that sufficient informatio, has been provided and that his review suppott conclusions of the following type, to be included in the staff's safety evaluation report:
"The diesel engine fuel oil storage and transfer system includes storage tanks, fill, vent, drain, and overflow return lines, fuel oil transfer pumps, strainers, filter, s alves, day tanks, and all corrponents and piping up to the connections to the engine.
The sccpe of review of the diesel engine fuel oil storage and transfer system for the plant included layout drawings, piping and instrumentation diagrams, and descriptive information for the system and auxiliary supporting systems essentiel to its operation. [The review has c'etermined the adequacy of the app!!cy
's proposed design criteria and design bases for the diesel engine fuel oil storage and transfer system, and the require-ments for syste,n performance during normal, abnormal, and accident conditions.
(CP)] [The review has determined that the design of the diesel engire fuel oil storage and transfer system and auxiliary supporting syster3 is in canformance with the proposed design cr:teria and baces.
(OL)]
"The basis for acceptance in the staff review has been conformance of the applicant's d-sign criteria and bases for the diesel engine fuel oil storage and transfer system and necessary auxiliary supporting systems to the Commission's regulations as set forth in the genera design criteria, and to applicable regulatory guides, staff technical positions, and industry standards.
"The staf f concludes that the design of the diesel fuel oil storage and transfer system conforms
- .o all applicable regula' ions, guides, staff positions, and industry standards, and is acceptable."
V.
REFLKENCE l.
10 CFR Pa-t 50, Appendix A, General Design Criteri;n 2, " Design Bases for Protection against Natural Phenomena."
2.
10 CFR Part 50, Appendix A, Genera Design Criterion 4. " Environmental and Missile Design Bases."
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3.
10 CFR Part $2, A;#en<iix A, General Design Criterion 5, " Snaring of Structures.
S y s t e:,, and Corponents 4
10 CfR Part 50, 4 penjix A, Genr=ral Design Criterion 17, Clectric Power Sjstens.'
b, Pegulatorj G;ide 1.26, ' Quality GroJp Classifications and Standirds for 4)ter,
Ster, and Pad 103ctive-Waste-Containing Cor;.onents of Nuclear Power Pla its 6.
c.egul a tory G;ide 1.29, "5ei smic Desir;n Cl as s i fica t ion. '
Pl3nts.'
7.
rjulatory GJide l.lO2, flood Protection fCr NJCleM i d.
M ::alatory Gaide 1.117, " Tornado Design Classification."
9.
vjulatory Guide 1.137, " Diesel Generator Fuel Oil Syste; >
10.
segulatory au,j_ l.63, " Initial Test Prcjra::s for Water Cculed Feactor Po.er Plants 11.
K,,1 S t a n1) rd N 19 5, F u e l O i l S s t e > for Stanacy Diesel Generaturs,' w erican
'onal
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5tandards Institute.
1.l Eranch Technical Positior._ ASB 3-1, " Protection A ;ainst Postulated Piping Failures in fluid Systerci Uutside Cont.inrent, attacned to $RP Eecticn 3.6.1, and
'.S 3-1, "icstalated Lreak and LeM age Locations in Fluid Syste-Piping Outside Containment, attach d tc SkP Section 3.6.'
13.
branch Technical Position ASo 9.5-1, "Guidelires for Fire Protection for N; clear Pcwer Plants (attached to SEP Section 9.5-1) 14.
Branch Technical Position ICSB-17 (PSD), " Diesel-Senerato, Protective Trip C'rcuit oypasses."
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9 9.5.4-7 Rev. I