ML20244A869
| ML20244A869 | |
| Person / Time | |
|---|---|
| Issue date: | 12/31/1979 |
| From: | NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| Shared Package | |
| ML20237L013 | List: |
| References | |
| FOIA-87-423, TASK-OS, TASK-RS-710-5 REGGD-01.009, REGGD-1.009, NUDOCS 8001220580 | |
| Download: ML20244A869 (5) | |
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/ U .S. NUCLEAR REGULATORY COMMISSION December 1979 P"%s g%># '
REGULATORY GU DE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.9 SELECTION, DESIGN, AND QUALIFICATION OF DIESEL-GENERATOR UNITS USED AS
.l STANDBY (ONSITE) ELECTRIC POWER SYSTEMS AT NUCLEAR POWER PLANTS A. INTRODUCTION equipment needed to maintain the plant in a safe condition if an extended loss of offsite power occurs.
General Design Criterion 17, " Electric Power Systems,"
of Appendix A, " General Design Criteria for Nuclear Power IEEE Std 387-1977, "lEEE Standard Criteria for Diesel- j Plants," to 10CFR Part 50," Domestic Licensing of Produc. Ginerator Units Applied as Standby Power Supplies for Nu-tion and Utilization Facilities," includes a requiremer.t that clear Power Generating Stations,"3 delineates principal the onsite electric power system have sufficient capacity design criteria and qualification testing requirements that,if and capability to ensure that (1) specified acceptable fuel followed, will help ensure that selected diesel-generator design limits and design conditions of the reactor coolant units meet their performance and reliability requirements.
pressure boundary are not exceeded as a result of anticipated IEEE Std 387-1977 was developed by Working Group 4.2C operational occurrences and (2) the core is cooled and con- of the Nuclear Power Engineering Committee (NPEC) of tainment integrity and other vital functions are maintained the Institute of Electrical and Electronics Engineers, Inc.
in the event of postulated accidents. (IEEE), approved by NPEC, and subsequently approved by the IEEE Stendards Board on September 9,1976. IEEE Std Criterion 111, " Design Control," of Appendix B, " Quality 387-1977 is supplementary to IEEE Std 308-1974, "IEEE Assurance Criteria for Nuclear Power Plants and Fuel Standard Criteria for Class IE Power Systems and Nuclear Reprocessing Plants," to 10 CFR Part 50 includes a require- Po Mr Generating Stations,"I and specifically amplifies ment that measures be provided for verifying or checking paragraph 5.2.4, " Standby Puer Supplies," of that docu.
the adequacy of design by design reviews, by the use of ment with respect to the application of diesel-generator alternative or simplified calculational methods, or by the units. IEEE Std 308-1974 is endorsed, with certain excep-performance of a suitable testing program, tions, by Regulatory Guide 1.32," Criteria for Safety Related Electric Power Systems for Nuclear Power Plants."
Diesel-generator units have been widely used as the power source for the onsite electric power systems. This A knowledge of the characteristics of each load is regulatory guide describes a method acceptable to the NRC essential in establishing the bases for the selection of a staff for complying with the Commission's requirements diesel-generator unit that is able to accept large loads in that diesel-generator units intended for use as onsite power rapid succession. The majority of the emergency loads are sources in nuclear power plants be selected with sufficient large induction motors. This type of motor draws, at full capacity and be qualified for this service. The Advisory voltage, a starting current five to eight times its rated load l ;
Committee on Reactor Safeguards has been consulted current. The sudden large increases in current drawn from )
concerning this guide and has concurred in the regulatory the diesel generator resulting from the startup of induction i position. motors can result in substantial voltage reductions. The f lower voltage could prevent a motor from starting, i.e., j B. OlSCUSSION accelerating its load to rated speed in the required time, or i cause a running motor to coast down or stall. Other loads I A diesel-generator unit selected for use in an onsite might be lost if their contactors drop out. Recovery from l electric power system should have the capability to (l) start the transient caused by starting large motors or from the j and accelerate a number of large motor loads in rapid loss of a large load could cause diesel engine overspeed l succession and be able to sustain the loss of all or any part which, if excessive, might result in a trip of the engine. !
, of such loads and maintain voltage and frequency within !
9 acceptable limits and (2) supply power continuously to the I Copies may t>e obtained from the Institute of Electrical end l
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C4 , *. c* <# Electronics Engineers, Inc., United Engineering Center, 345 East i Lines indicate substantive changes from Revision I. 47th Street, New York, New York 10017.
N O USNRC REGULATORY GUIDES Comments should be sent to the Secretary of the Commission, 3 Regulatory Guides are issued to describe and make available to the nt o $oc ng an 5 rv c nc'h i
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public methods Eceptable to the NRC staff of im plemen ting specific parts of the Commission's regulations, to delineate tecn. The guides are issued in the following ten broad divisions: l N ated accident 5, or t or id u an'ce to op tbegu atory' 1. Power Reactors 6. Products jh he 6's n$ r u t r'e d, ethc'ds an[sIk t ons diNerenNro Nos se u sand tertais ac I ties ccupation Health out in the guides will be acceptable if they provide a basis for the 4. Envirorimental and Siting 9. Antitrust and Financial Review <
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p len e This g d was rev s d as a res it su an v co . be ob 41 y ng t e S C ea Reg ato y a sson, ments received from the public and additional staff review. Wasn6ngton, D.C. 20555, Attention: PubHcations Sales Manager.
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These same consequences can also result from the cumu- system should be selected to huve a continuous load ruting lative effect of a sequence of more moderate transients if (as defined in Section 3.7.1 of IEEE Std 3871977) equal the system is not permitted to recover sufficiently between to or greate'r than the sum of the conservatively estimated _
successive steps in a loading sequence. loads needed to be powered by that unit at any one time, in the absence of fully substantiated performance character- l J
Generally it has been industry practice to specify a istics for mechanical equipment such as pumps, the electric maximum voltage reduction of 10 to 15 percent when motor drive ratings should be calculated using conservative starting large motors from large capacity power systems and estimates of these characteristics, e.g., pump runout condi. -
a voltage reduction of 20 to 30 percent when starting these tions and motor efficiencies of 90 percent or less and I motors from limited capacity power sources such as diesel- power factors of 85 percent or less, generator units. Large induction motors can achieve rated speed in less than 5 seconds when powered from adequately 2. At the operating license stage of review, the predicted sized diesel generator units that are capable of restoring the loads should not exceed the short time rating (as defined in voltage to 90 percent of nominalin about i second. Section 3.7.2 of IEEE S*d 3871977) of the diesel-generator unit.
Protection of the diesel generator unit from excessive overspeed, which can result from a loss ofload,is afforded 3. In Section 5.1.1," General,"of IEEE Std b ' -I7,thef '
by the immediate operation of a diesel generator unit trip, requirements of IEEE Std 3081974 should be 4 : subject usually set at 115 percent of nominal speed. In addition, to the regulatory position of Regulatory Guide 1., .
the generator differential trip must operate immediately in order to prevent substantial damage to the generator.There 4. Section 5.1.2," Mechanical and ElectricalCapabilities,"
are other protective trips provided to protect the diesel- of IEEE Std 387 1977 pertains,in part, to the starting and generator units from possible damage or degradation, load accepting capabilities of the diesel generator unit. In However, these trips could interfere with the successful conjunction with Section 5.1.2, each diesel generator unit functioning of the unit when it is most needed,1.e., during should be capable of starting and accelerating to rated accident conditions. Experience has shown that there have speed, in the required sequence, all the needed engineered i been numerous occasions when these trips have needlessly safety feature and emergency shutdown loads. The diesel-l shut down diesel generator units because of spurious generator unit design should be such that at no time during operation of a trip circuit. Consequently, it is important the loading sequence should the frequency and voltage that measures be taken to ensure that spurious actuation of decrease to less than 95 percent of nominal and 75 percent these other protective trips does not prevent the diesel- of nominal, respectively, (A larger decrease in voltage and l generator unit from performing its function, frequency may be justified for a diesel-generator unit that [,
carries only one large connected load.) Frequency should \
l The uncertainties inherent in estimates of safety loads at be restored to within 2 percent of nominal, and voltage the construction permit stage of deegn are sometimes of such should be restored to within 10 percent of nominal within magnitude that it is prudent to provide a substantial margin 60 percent of each load sequence time interval. (A greater in selecting the load capabilities of the diesel-generator unit. percentage of the time interval may be used if it can be This margin can be provided by estimating the loads conser- justified by analysis. However, the load-sequence time vatively and selecting the continuous rating of the diesel- interval should include sufficient margin to account for the generator unit so that it exceeds the sum of theloads needed accuracy and repeatability of the load sequence timer.)
at any one time. A more accurate estimate of safety loads is During recovery from transients caused by step load increases i possible during the operating license stage of review because or resulting from the disconnection of the largest single !
detailed designs have been completed and preoperational load, the speed of the diesel-generator unit should not i test data are available. This permits the consideration of a exceed the nominal speed plus 75 percent of the difference I somewhat less conservative approach, such as operation between nominal speed and the overspeed trip setpoint i with safety loads within the short time rating of the diesel- or 115 percent of nominal, whichever is lower. Further, the l generator unit, transient following the complete loss of load should not I cause the speed of the unit to attain the overspeed trip C. REGULATORY POSITION setpoint.
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Conformance with the requirements of IEEE Std 3871977, 5. In Section 5.4," Qualification,"of IEEE Std 3871977, !
"IEEE Standard Criteria for Diesel-Generator Units Applied the qualification testing requirements ofIEEE Std 3231974, as Standby Power Supplies for Nuclear Power Generating "lEEE Sta~ndard for Qualifying Class IE Equipment for i Stations," dated June 17, 1977, is acceptable for meeting Nuclear Power Generating Stations,"2 should be used i the requirements of the principal design criteria and qualifica- subject to the regulatory position of Regulatory Guide 1.89, tion testing of diesel-generator units used as onsite electric " Qualification of Class IE Equipment for Nuclear Power i power systems for nuclear power plants subject to the Plan ts."
following:
- 6. Section 5.5," Design and Application Considerations,"
- 1. When the characteristics of loads are not accurately of IEEE Std 387 1977 pertains to design features for con- [
known, such as during the construction permit stage of sideration in diesel-generator unit design. In conjunction \ l design, each diesel-generator unit of an onsite power supply with Section 5.5, diesel-generator units should be designed l 1.9 2 l
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to be testable during operation of the nuclear power plant Qualification of Class IE Equipment for Nuclear Pooee as well as while the plant is shut down The design should Generating Stations," for seismic analysis or seismic testing include provis!ons so that the testing of the units will by equipment manufacturers should be used subject to the !
simulate the parameters of operation (outlined in Regula- regulatory position of Regulatory Guide 1.100, " Seismic tory Guide 1.108, " Periodic Testing of Diesel Generator Qualification of Electric Equipment for Nuclear Power Units Used as Onsite Electric Power Systems at Nuclear Plants."
Power Plants") that would be expected if actual demand j were to be placed on the system. 10. The optior, indicated by "may"in Section 6.3.2(5)(c) of IEEE Std 387 1977 should be treated as a requirement.
Testability should be considered in the selection and location of instrumentation sensors and crit! cal components 11. Section 6.5," Site AcceptanceTesting,"and Section 6.6, (e.g., governor, starting system components), and the " Periodic Testing," of IEEE Std 387 1977 should be supple-overall design should include status indication and alarm mented by Regulatory Guide 1.108.
features. Instrumentation sensors should be readily acceselble i and, where practicable, designed se that their inspection 12. Section 4," Reference Standards,"of!EEE Std 3871977 and calibration can be verified in place, lists additional applicable IEEE standards.The specific appil-cability or receptability of these referenced standards has )
- 7. Section 5.6.2.2, " Automatic Control," of IEEE Std been or will be covered separately in other regulatory guides, j 387 1977 pertains to automatic startup requirements and where appropriate, their relationship to other operating modes. In conjunction with Section5.6.2.2, engine overspeed and generator differ- 13. Section 6.3.2, " Start and Load Acceptance Qualifi-ential trips may be implemented by a single channeltrip. All cation," pertains to test requirements for diesel generator other diesel-generator protective trips should be handled in unit qualification. In conjunction with Section 6.3.2, one of two ways: Either,(1) a trip should be implemented fewer successful start and-load tests and allowed failures with two or more independent measurements for each trip than that specified-300 valid tests with no more than 3 parame t er with coincident logie provisions for trip actuation, failures-may be justified for a diesel generator unit that or (2) a trip may be bypassed under accident conditions, carries only one large connected load tested under actual provided the operator has sufficient time to react appro- conditions, provided an equivalent reliability / confidence l
priately to an abnormal diesel generator unit condition. The levelis demonstrated.
I design of the bypass circuitry should satisfy the requirements of IEEE Std 279 1971 at the diesel generator system level 14. In Section 6.3.1, " Load Capability Qualification," of i l
and should include the capability for (1) testing the status IEEE Std 3871977, the order of sequence of load tests i
j and operability of the bypass circuits, (2) alarming 'n the described in parts (!) and (2) should be as follows: Load control room abnormal values of all bypass parameters, and equal to the continuous rating should be applied for the
- (3) manually resetting of the trip bypass function.(Capability time required to reach engine temperature equilibrium, at (
l l for automatic reset is not acceptable.) which time, the rated short time load should be applied for j
- a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. Immediately following the 2-hour
- 8. Section 5.6.3.1, " Surveillance Systems," of IEEE Std short time load test, load equal to the continuous rating 387 1977 pertains to status indication of diesel-generator should be applied for 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br />, unit conditions. In conjunction with Section 5.6.3.1, in order to facilitate trouble diagnosis, the surveillance system D. IMPLEMENTATION should indicate which of the diesel-generator protective trips is activated first. Except in those cases in which the applicant proposes an acceptable alternative method for complying with specified
- 9. In Section 6.3," Type Qualification Testing Procedures portions of the Commission's regulations, the method de-and Methods," of IEEE Std 387 1977, the requirements of scribed herein will be used in the evaluatien of applications lEEE Std 3441975, " Recommended Practices for Seismic for construction permits docketed after December 1979.
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SAFETY GUIDE 9 SELECTION OF DIESEL GENERATOR SET CAPACITY FOR STANDBY POWER SUPPLIES A. Introduction large increases in current drawn from the die-sel generator resulting from the startup of General Design Criterion 17 requires that induction motors can result in substantial volt-the onsite (standby) power supply for a nuclear age reductixts. The lower voltage could pre.
power plant be of sufficient capacity and capa- vent a motor from starting or cause a running bility to assure that (1) specified acceptable motor to coast down. Other loads also might be fuel design limits and design conditions of the lost if their contactors drop out. Recovery !
reactor coolant pressure boundary are not ex. from the transient caused by starting large l ceeded as a result of anticipated operational motors or from the loss of a large load could occurrences and (2) the core is cooled and con- cause diesel engine overspeed which, if exces-tainment integrity and other vital functions sive, might result in a trip of the machine.
are maintained in the event of postulated acci- These same consequences also can result from I dents. Diesel generator sets have been widely 6 m W htMag m dwe used as the power source for the standby power moderate transients if the system is not per- 1 supphes. This safety guide describes an accept- mitted to recover sufficiently between succes.
3i able basis for the selection of diesel generator sive steps in a loading sequence.
sets of sufficient capacity and margin to imple- J ment General Design Criterion 17. Generally it has been industry practice to j specify a maximum voltage reduction of 15 ;
percent when starting large motors from large B. Discussion capacity power systems and a 25 to 30 percent A diesel generator set selected for use as a voltage reduction when starting these motors i standby power supply should have the capabil- from limited capacity power sources such as )
ity to (1) start and accelerate a number of . diesel generator sets. Large induction motors large motor loads in rapid succession, and be supplied with nominal voltage can achieve l able to sustain the loss of any such load, and rated speed in less than 5 seconds when pow- l (2) supply continuously the sum of the loads ered from adequately sized diesel generator sets I needed to be powered at any one time. This which are capable of restoring tha voltage to l guide provides an acceptable way of assuring 90 percent of nominalin about I second. l these objectives are met. The considerations Protection of the diesel generator set from involved in the need for the diesel generator to excessive overspeed, which can result from a start and achieve rated conditions in a short loss of load, is afforded by the provision of a period of time are evaluated on an individual diesel generator set trip, usually set at 115 per-case basis. cent of nominal speed.
A knowledge of the characteristics of each A problem arises in assessing whether the ;
load is essential in establishing the bases for goal of continuously supplying the sum of the j the selection of a diesel generator set that is needed loads is achieved with sufficient capacity )
able to accelerate large loads in rapid succes- and margin, because of the various interpreta-sion. The majority of the emergency loads are tions of load ratings quoted by diesel generator large induction motors. This type of motor suppliers. The load ratings represent the loads draws, at full voltags, a starting current five at which the set can operate continuously with to ten times its rated load current. The sudden, a high availability, if various specified mainte.
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i em,g, crease to less than 95 percent of nomi- lower. Voltage should be restored ta nal and 75 percent of nominal, reske- within 10 percent of nominal and fre-tiv'ly. During recovery from transients i quency should be restored to within 2 caused by step load increases or result-percent of nominalin less than 40 per.
ing from the disconnection of the larg. cent of each load sequence time inter-est single load, the speed of the diesel val.
generator set should not exceed 75 per- 5. The suitability of each diesel generator cent of the difference between nominal set of the standby power supply should speed and the overspeed trip set point be confirmed by prototype qualification or 115 percent of nominal, whichever is test data and preoperational tests.
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- U.S. NUCLEAR REGULATORY COMMISSION Nmmba 1978
%...*) REGULATORY a
OFFICE OF STANDARDS DEVELOPMENT GU DE REGULATORY GUIDE 1.9 h l SELECTION, DESIGN, AND QUALIFICATION OF DIESEL-GENERATOR UNITS USED AS ONSITE ELECTRIC POWER SYSTEMS AT NUCLEAR POWER PLANTS A. INTRODUCTION B. DISCUSSION i General Design Criterion 17, " Electric Power A diesel-generator unit selected for use in an S y stems ," of Appendix A, " General Design onsite electric power system sh , d have the 1 Criteria for Nuclear Power Plants," to 10 CFR capability to (1) start and ac ate a number Part 50, " Domestic Licensing of Production and of large motor loads in rapid sion and be
! Utilization Facilities," includes a require. ment able to sustain the loss o , part of that the onsite electric power system have such loads and maintain vo e an equency sufficient capacity and capability to ensure within acceptable limi . d~ ) supply power that (1) specified acceptable fuel design limits continuously to the q ded to main-and design conditions of the reactor coolant tain the plant in a ee ditio if an extended l pressure boundary are not exceeded as a loss of offsite po rpur%
result of anticipated operational occurrences l and (2) the core is cooled and containment in- IEEE Std -19 E Standard Criteria j tegrity and other vital functions are maintained for Diesel- tor nits Applied as Standby r in the event of postulated accidents. Power p Nuclear Power Generating
[ Statio e es principal design chteria Criterion III, " Design Control," of Appen- an ua testing requirements that, if
(' dix B, " Quality Assurance Criteria for Nuclear to wed, help ensure that select (ed diesel-Power Plants and Fuel Reprocessing Plants," to e r units meet their performance and 10 CFR Part 50 includes a requirement that li requirements. IEEE Std 387-1977 was measures be provided for verifying or checking ed by Working Group 4.2C of the the adequacy of design by design reviews, .
c r Power Engineering Committee (NPEC) the use of alternative or simplified calculati *the Institute of Electrical and Electronics j methods, or by the performance of a suit e Engineers, Inc. (IEEE), approved by NPEC, I testing program. and subsequently approvid by the 1EEE Stan- l dards Board on September 9,1976. IEEE Std .
l Diesel-generator units have been ely d 387-1977 is supplementary to IEEE Std 308-as the power source for the ons ele 'e 1974, "IEEE Standard Criteria for Class IE power systems. This regulatory de- Power Systems and Nuclear Power Generating scribes a method acceptable to the NRC staff Stations ,"1 and specifically amplifies paragraph i 5.2.4, " Standby Power Supplies," of that doc-for complying with the ission's require- l ments that diesel-gen units intended for ument with respect to the application of diesel- '
use as onsite power ', nuclear power generat)r units. IEEE Std 308-1974 is en-plants be selected wit t capacity and dorsed, with certain exceptions, by Regulatory l be qualified for Guide 1.32, " Criteria for Safety-Related I k Electric Power Systems for Nuclear Power 1 rh. eudstantial der er su in aus rwismo has *** Plants . "
11 impract2 cal ' . .the c ges with hnes in th. margin.
EMNs M, Inc., una.NaNr$sieTn,j d A knowledge of the cl.gracteristics of each j 47th street, Jork, New York 10017. load is essential in establishing the bases for usNRC REQULATORY OUIDEg eeuw uns m Wg r hum.
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i within 2 percent of nominal, and voltage conditions. The design of the bypass I should be restored to within 10 percent of circuitry should satisfy the requirements 1 I nominal within 60 percent of each load- of IEEE Std 279-1971 at the diesel- i i sequence time interval. ( A greater percent- generator system level and should age of the time interval n.ay be used if it can include the capability for (1) testing the be justified by analysis. However, the load- status and operability of the bypass sequence time interval Ahould include suffi- circuits, (9 alarming in the control room cient margin to account for the accuracy and abnormal Jues of all bypass param-repeatabihty of the load-sequence timer.) eters, and (3) manually resetting of the ,
During recovery from transients caused by trip bypass function. (Capability for J step load increases or resulting from the automatic reset is not acceptable.)"
disconnection of the largest single load, the speed of the diesel-generator unit should not 9. Section 5.6.3.1, " Surveillance Systems ," of exceed the nominal speed plus 75 percent of IEEE Std 387-1977 should be supplemented with ,
the difference between nominal spud and the the following: 1 overspeed trip setpoint or 115 parcent of "In order to facilitate trouble diagnosis, the !
nominal, whichever is lower. Furtaer, the surveiUance system should indicate which of transient following the complete loss of load the diesel-generator protective trips is acti- '
should not cause the speed of the unit to vated first." l attain the overspeed trip setpoint."
- 10. In Section 6.3, " Type Qualification Test- l
- 6. In Section 5.4, " Qualification," of IEEE ing Procedures and Methods," of IEEE Std 387- l
' Std 387-1977, the qualification testing require- 1977, the requirements of IEEE Std 344-1975, t ments of IEEE Std 323-1974, "IEEE Standard for " Recommended Practices for Seismic Qualifica-Qualifying Class IE Equipment for Nuclear tion of Class 1E Equipment for Nuclear Power Power Generating Stations,"1 should be used Generating Stations," for seismic analysis or subject to the regulatory position of Regulatory seismic testing by equipment manufacturers Guide 1.89, " Qualification of Class IE Equip- should be used subject to the regulatory posi-ment for Nuclear Power Plants." tion of Regulatory Guide 1.100, " Seismic Quali-fication of Electric Equipment for Nuclear
- 7. Section 5.5, " Design and Application Con- Power Plants."
sider ations," of IEEE Std 387-1977 should be suppicmented with the following: 11. The option indicated by "may" in Sec-tion 6.3.2(5)(c) of IEEE Std 387-1977 should l
" Diesel-generator units should be designed to be treated as a requirement. l be testable during operation of the nuclear
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pcwer plant cs well as while the plant is shut 12. Section 6.5, " Site Acceptance Testing,"
down. The design should include provisions and Section 6.6, " Periodic Testing," of IEEE so that the testing of the units wiu simulate Std 387-1977 should be supplemented by Regu-the parameters of operation (outlined in latory Guide 1.108.
Regulatory Guide 1.108, " Periodic Testing of
- 13. Section 4 " Reference Standards ," of Diesel-Generator Units Used as Onsite Electric Power Systems at Nuclear Power IEEE Std 387-1977 lists additional applicable Plants") that would be expected if actual IEEE standards. The specific applicability or demand were to be placed on the system. acceptability of these referenced standards has been or will be covered separately in other
" Testability should be considered in the regulatory guides, where appropriate, selection and location of instrumentation sen-sors and critical components (e.g. , gover- D. IMPLEMENTATION nor, starting system components), and the overall design should include status indica- This proposed guide has been released to tion and alarm festures. Instrumentation encourage public participation in its develop-sensors should be readily accessible and ment. Except in those cases in which an appli-designed so that their inspection and calibra- cant proposes an acceptable alternative method tion can be verified in place " for complying with specified portions of the Commission's regulations , the method to be
- 8. Section 5.6.2.2, " Automatic Control," of described in the active guide reflecting public IEEE Std 387-1977 should be supplemented with comments will be used in the evaluation of the following: applications for construction permits docketed after the implementation date to be specified in (3) "With the exception of the engine over- the active guide. This implementation date will speed trip and the generator differential in no case be earlier than July 1979.
trip, au diesel-generator protective trips should be either (1) implemented with if an applicant wishes to use this draft guide two or more independent measurements in an application docketed prior to the imple-for each trip parameter with coincident mentation date, the pertinent portions of the-(, logic provisions for trip actuation or (2) application wiu be evaluated on the basis of automatically bypassed during accident this draft guide.
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