ML19221B071
| ML19221B071 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-09.5.6, NUREG-75-87, NUREG-75-87-9.5.6, SRP-09.05.06, SRP-9.05.06, NUDOCS 7907120352 | |
| Download: ML19221B071 (5) | |
Text
U.S. NUCLEAR REGULATORY COMMISSION STANDARD REV EW PLAN OFFICE OF NUCLEAR REACTOR REGULATION SECTION 9.5.6 EMERGENCY DIESEL ENGINE STARTING SYSTEM REVIEW RESPONSIBILITIES Primary - Power Systems Branch (PSB)
Secondary - Auxiliary Systems Branch (ASB)
Mechanical ingineering Branch (MEB)
Structural Enginee-ing Branch (SEB)
Materials Engineering Branch (MTEB) 1.
AREAS OF REVIEW The PSB review of the emergency diesel engine starting system EDESS includes tnose system leatures necessary to assure reliable starting of the emergency diesel engine following a loss of offsite power to assure conformance with the requirements of General Design Criteria 2, 4 and 5.
The review includes the system air compressors, air receivers, devices to crank the diesel engine, valves, piping, filters, and associated uncillary instrumentation and control systems.
1.
The P5B reviews the EDDS to verify that:
l a.
Each emergency diesel engine has reliable, redundant starting systems of adequate starting capacity.
b.
The system complies with appropriate seismic requirements and quality standards, dnd has been properly designed, fabricated, erected, and tested.
c.
Essential portions of the system are housed within seismic Category I structures capable of protecting the system from extreme natural phenomena, missiles, and the effects of pipe whip or jet impingement from high and moderate energy pipe breaks.
2.
The PSB will determine the adequacy of design, installation, inspection and testing of all electrical components (sensing, control and power) required for proper operation of the system, including interlocks.
3.
The appliccnt's proposed technical specifications are reviewed for operating license applications as they relate to areas covered in this SRP section.
USNRC STANDARD REVIEW PLAN st.ndard review pi.co.re propered fo. th. g 4dence of the ofa e of mocieor R.ector Regoiet.on steff re.pon.
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Operete nwcieer power piante These decorpent. are mode eveelab4e to the pubesc.o part of the Commiseson a poucy to 6pform the nwceeee endustry and the general pub 4c of rego. tory procedures and polieses Standsed rem p4ane are not eebetetutes for requietory gu6 des or the Commiesson e reguistione end contpelante wftft them le not requered The standard rew*ew pien sections are lieved to Reveeson 2 of the Stande d Formet and Content of Seiety Anervese Reports for Nuc6eer Power Plants Not met sectione of the $tanderd Formet have e cerecependarg review plan t.
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Secondary reviews are performed by other branches and the results used by the PSB to l
complete the overail evaluation of the system. The evaluations performed by other. are as follows. The SEB determines the acceptability of the design analyses, procedures, and criteria esed to establish the ability of structures housing the system to withstand the effects of natural phenomena such as the safe shutdown earthquake (SSE), the probable maximum flood (PMF), and tornado missiles. The MES reviews the seismic qualification testing of components and confirms th6t components, piping, and structures are designed in accordance with applicable codes and standards. The ASB determines that the assigned seismic and quality group classifications for system compnnents are acceptable. The ASB alsn determines that the EDESS is in accordance with Branch Technical Positions ASB 3-1 and MEB 3-1 for breaks in high energy and moderate energy piping systems outside containment. The MTEB verifies that inservice inspectiun requirements are met for system ccmponent; and, upon request, will verify the compatibility of the materials of construction with service conditions.
II ACCEPTANCE CRITERIA Acceptability of the diese! engine starting system, as described in the applicant's safety analysis report (SAR), is based en specific general design criteria and regulatory quih s.
An additional basis for acceptability is the similarity of the EDESS design with that of previously revieaed plants having satisfactory operating experience.
The design of the ECESS is acceptat.ie if the integrated design cf the system is in accordance with the fcilowing criteria:
1.
General Cesign Criterion 2, as related to the ability of structures housing the system to withstand the effects of natural phenomena such as earthquakes, tornadaes, hurricanes, and floods, as established in Chaptors 2 and 3 of the SAR.
2.
General Design Criterion 4, with respect to structures housing the systems and
^
the system'itself being c?pable of withstanding the ef fects 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 c errpo nen t s important to safety to perform required safety functions.
4 Regulatory Guide 1.26, as related to cuality group classification of the system compenents.
5.
Regulatory Guide 1.29, as reiated to the systom seismic design classification.
6.
Regulatory Guide 1.68, as related to preoperational and startup testing of the air starting system.
7.
Branch Technical Positions ASB 3-1 and MEB 3-1, as related to breaks in high and moderate energy piping systems outside containment.
Fev. 1 9.5.6-2
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8.
Branch Technical Position ICSB-17 (P58), as related to engine air starting system protective interlock during accident conditions.
9.
The EDESS should also meet the following specific criteria:
a.
Each diesel engine should be provided with an air compressor and with indepenJent and redundant starting systems, each consisting of two air receivers, injection l lines and valves, and devices to crank t h<
engine.
b.
As a minimum, each of the redundant starting systems should be cap 3ble of crTnking a cold diesel engine tive times without recharging the r eceivers.
Each cranking cycle duration should be approximately three seconds, or consist of two to three engine revolution 3, wnichever cranking cycl? time interval is l
larger.
c.
Alarms should be piovided which.i?rt operating personnel if the air receiver pressure falls below the minimum allowable value.
d.
Provisions snould be made for the periodic or automatic blowdown of accumulated moisture and foreign material in the air receivers.
For those areas of revie.' identified in subsection I of t is SRP section as being the responsibility of othe a branches, the acceptance crit ria and their methods of applicatinn are contained in the SRP sections corresponding to those branches.
III. REVIEW PROCEDURES The procedures below are used during the cc.nstruction permit (CP) review to determino that the design criteria and b3ses and the preliminary design as set forth in the prelimi-nary sa ety analysis report meet the acceptance criteria given in subsection II.
For the f
review of operating license (OL) applications, the procedures are used to verify that the initial design criteria and bases hwe been appropriately implemented in the final design as set forth in the final safety analysis report. The review procedures for OL applications include a determination that the content and intent of the technical speci-fications prepared by the applicant are in agreement with the requirements for system testing, minimum performance, and surveillance developed during the review.
The reviewer will select and emphasize material from the paragraphs below, as may be appropriate for a particular case.
Upon request from the primary reviewer, the secondary review branches wi'l provido input for the areas of review stated in subsection I.
The primary reviewer obtains and uses such input as required to assure that this review procedure is complete.
1.
The reviewer establishes that the [ CESS description and piping and instrumentation drawings (P& ids) clearly delineate all modes of operation and include the means for monitoring, inaicating, and controlling receiver air pressure as required by tre engine starting service. The P& ids are reviewed to determine that each receiver has been provided with a pressure gauge, relief valve, drain valve, an automatic
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means of maintaining the receiver pressure within an allowable range, and suitable low pressure alarms. If there are piping interconnections between shared systems, they are reviewed to verify that failure could not lead to the loss of starting of more than one diesel ennine.
The building layout drawings are examined to ascertain hat sufficient space has been provided around the components to permit inspection.
The reviewer verifies that essential portions of the EDESS are classified seismic Cate n I.
2.
The SAR is reviewed to assure that each diesel eng;ne has its own compressor and that the compressor capacity is adequate with respect to the air receiver capacities of the redundant starting systems.
3.
The reviewer verifies that the system has been designed to be operated and maintained in the event of adverse environmental conditions such as hurricanes, tornadoes, or floods, and is protected against the effects of internally-or externally generated missiles.
4.
The reviewer determines that the failure of non-seismic Category I systems, structures, or co,ponents located close to the ED5SS will not preclude operation of the system.
5.
The rsviewer determines that essential portions of the EDESS are protected from the effects of high and moderate energy line breaks. Layout drawings are reviewed to assure that no high or moderate energy piping systems are close to the system, or that protection from the effects of failure are provided. The means of providing such protection are discussed in Section 3.6 of the SAR and the procedures for reviewing this information are given in the corresponding SRP sections.
6.
The SAR information, P& ids, related system drawings, and failure modes and effects analyses are reviewed to assure that minimum requirements of the system will bo met following design bases accidents, assumirg a concurrent single active failure and loss of offsite power.
The analyses presented in the SAR are reviewed to assure function of required components following postulated accidents. Utilizing the des criptions, related drawings, z:nd analyses, the reviewer verifies that minimum system requirements are met for each cegraded situation over the required time spans. For each case the design is considered acceptable if minimum system require-ments are met.
IV.
EVALUATION FINDINGS The reviewer verifies that the information prcvided and his review support conclusions of the following type, to be included in the staf f's safety evaluation report:
"The emergency diesel engine starting system includes the features necessary to assure that the system will be available and capable of starting the diesel engine following a loss of offsite power.
The scope of review of the system for the Rev. 1 9.5.6-4
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plant included layout drawings, flow diagrams, piping and instrumenta-tion diagrams, and descriptive information for the emergency diesel engine starting system and supporting systems essential to its operatica. [The review has determined the adequacy of the applicant's proposed design criteria and design bases for the system, and the provisions necessary for diesel engine starting during C l conditions of plant operation. (CP)] [The i view has determined that the design of the emergency diesel engine starting system and supporting systens is ia conformance with the design criteria and bases.
(OL)J "The basis for acceptance in the review has been conformance of the applicant's designs and design criteria for the emergency diesel engine starting system and necessary supporting systems to the Commission's regulations as set forth in the General Design Criteria, and to applicable regulatory guides, staff technical positions, and industry standards.
"The staff concludes that the design of the emergency diesel engine starting system conforms tc ill applicable regulations, guides, staff positions, and industry standards, and is acceptable."
V.
REFERENCES 1.
10 CFR Part 50, Appendix A, General Design Criterion 2 " Design Bases for Protection Against Natural Phenomena."
2.
10 CFR Part 50, Appendix A, General Design Criterion 4, " Environmental and Missile Design Bases."
3.
10 CFR Part 50, Appendix A, General Design Criterion 5, " Sharing of Structures, Systems, and Components."
4.
Regulatory Guide 1.26, " Quality Group Classifications and Standards For Water,
Steam, and Radioactive-Waste-Containing Components of Nuclear Power Plants."
5.
Regulatory Guide 1.29, " Seismic Design Classification.
6.
Regulatory Guide 1.68, " Initial Test Programs for Water Cooled Reactor Power Plants."
7.
Branch Technical Positions ASB 3-1, " Protection Against Postulated Piping Failures in Fluid Systems Outside Containment," attached to SRP Section 3.6.1, and MEB 3-1,
" Postulated Break and Leakage Locations in Fluid System Piping Outside Containment,"
attached to SRP Section 3.6.2.
8.
Branch Technical Position ICSB-17 (PSB), " Diesel Generator Protective Trip Circuit Bypasses," attached to SPP Apcendix 8-A, 149 047 9.5.6-5 pey, 1