ML19221A861

Reg Guide 1.32,Revision 2, Criteria for Safety-Related Electric Power Sys for Nuclear Power Plants

ML19221A861
Person / Time
Issue date:	02/28/1977
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
To:
References
REGGD-01.032, REGGD-1.032, NUDOCS 7907100141
Download: ML19221A861 (3)

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U.S. NUCLEAR REGUI. ATORY COMMISSION February 1977

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REGULATORY GUIDE 1.32 CRITERIA FOR SAFETY-RELATED ELECTRIC POWER SYSTEMS FOR NUCLEAR POWER PLANTS A. INTRODUCTION This resision to IEEE Std 308-1971 has made the standard consistent with the requirement in Criterion General Design Criterion 17, " Electric Power 17 for two circuits to the offsite network, each Systemc of Appendix A. " General Design Criteria designed to be as ailable in sufficient time following a for Nuclear Pow er Plants," to 10 CFR Part 50, loss of onsite alternating current power supplies and

'l icensing of Production and Utilization FacilitiesJ the other offsite electric pow er circuit. However, two requires that an on3ite electric power system and an potential conflicts with Criterion 17 remain un-offsite electric power system be prosided to permit resolsed: one in the area of availability of offsite functioning of structures, systems, and components power (Item 1) and the other in battery charger supp-important to safety. In addition, Criterion !7 con-ly requirements (Item 2). In addition, an incon-tains requirements concerning system capacity, in-sistency exists between IEEE Std 308-1974 and IEEE dependence, redundancy, availability, testability, and Std 450-1975 (item 3).

reliabihty. General Design Criterion 18. " Inspection and Testing of Electric Power Systems, of Appendix

1. IEEE Standard 308-1974, Section 5.2.3(4), first A to 10 CFR Part 50, contains requirements concern-paragraph, requires that offsite power he avaib :e ing periodic inspection, testing, and testability of within an acceptable time following a less-of-coolant electric pow er sy stems important to safety. This guide accident. In contrast, Criterion 17 requires that off-describe i r:ethod acceptable to the NRC staff of site power be available within a few seconds fo: low-9 complying with Criteria 17 and 16 with respect to the mg a Ims-of-coolant acc: dent. Th!ts a potential fcr design, operation, and testing of safety-related nisunderstanung exista with regard to the maximum electric power systems in all types of nuclear power permissible time for access to the effsite network in i plants. The Advisory Committee on Reactor the esent of a loss-of-coolant accident, and further l Safeguards hcs been consulted concerning this guide guidance is needed.

i and has concurred in the regulatory position.

2. Section 5.3.4 of IEEE Std 308-1974 requires, in B. DISCUSSION part, that each battery charger supp!y (a) furnish electric energy for the steady-state operation of con-IEEE Std 308-1974 is a resision of IEEE Std 308-nected loads required during normal and postacci-1971 and was prepared by Working Group 4.l of the dent operation while its battery is returned to or Nuclear Power Engineering Committee (NPEC) of maintained in a fully charged state a;1d (b) have suf-the Institute of Electrical and Electronics Engineers fiaent capacity to re3 tore the battery from the design (IEEE). IEEE Std 308-1974 was approsed by NPEC minimum charge to its fully charged state w hile sup-at its meeting on May 17-18, 1973, and subsequently plying normal and postaccident steady-state loads. In by the IEEE Standards Board on December 13,1973.

contrast, the equivalent position of Criterion 17 re-quires that the onsite electric power supplies, in-

• tmes mdute susianta e dunges from rresuussue ciuding the batteries and the onsite e:ectric distribu-

' H-i i stJ W W4,"HIL Standard Criteru for Class 1E Power tion system, hase sufficient independence, redun-Suter"s for N udear Po+er Generatmg Stanons." me be obtamed dancy, CJpacity, and testability to perform their f rom the Insutute of I lectrial and I lectronics I ngmeers. t'nned i ngmcermg Center. 345 Last 4'th Street. New York. New York fdy functions assuming a single failure. Criterion w

17, therefore, aces not restrict the battery charger USNRC REGULATORY GUIDES co-e~ s e t>e - to the s mrv oe n co,r~ss US Nudear Rag 2 m

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supply loads to normal and postaccident steady-state nuclear power plants hae been the subject of such loads. A conflict may therefore exist for those plants regulatory guides as Regulatory Guide E9 (Safety in w hich other loads (e.g., loads required during hot Guide 9 ), " Selection of Diesel Genera *or Set or cold shutdow n,large startup loads durirg an acci-Capacity for Standby Pow er Supplies, and dent, or other design basis esents) are greater than Regulatory Guide 1.93 "Asailability of Elcetric the normal and postaccident steady-state loads.

Power Sources.

3. Table 2 "lliustratise Periodie TestsJ' of IEEE The criteria and requirements in IEEE Std 308 Std 308-197i!ists a test intersal of 3 years for the bat-1974 are indicated by the serbs "shall" and "must,'

tery performance discharge test and refers to IEEE and recommendations are indicated by the serb Std 450-1972, " Recommended Practice for "sh o u ld.'

'I he terms "may,' ' sug est ed,'

and "il-Maintenance, Testing, and Replacement of large lu stratis e' indicate optional practices.

Stationary Type Power Plant and Substation l ead Storage Batteries,' for details regarding performance C. FEGULATORY POSITION of such tests. Subsequent to the publication of IEEE Std 308-1974, IEEE Std 450-1972 was resised and

1. For the portion of safety-related electric power published as IEEE Std 450-1975, "lEEE Recem-systems within its scope, the criteria, requirements, mended Practice for M aintena nce, Testing r.d and recommendations in IEEE Std 305-1974 are Replacement of Earge Eead Storage Batttries for generally acceptable to the NRC staff and provide an Generating Stations and Substations." IEEE Std 450-adequate basis for complying with the Commission's 1975 specifies a battery performanc-discharge test General Design Criteria 17 and 18 of Appendix A to within the first two y ars of sersice and thereaf er at 10 Cl R Part 50 with respect to the design, operation.

t intersals of 5 years until the battery shows signs of and testing of electric power systems. subject to the degradation or until 85" of espected seruce life i3 follow ing:

ruached. at w hich time annual tests are required. The 3-year mtersal specifitd n IEEE Std 308-1974 con.

a, Asailability of Offsite Power. Consistent with qiets woh these requirements. IEEE Std 450-1975 the requirements of Criterion 17, the phrase "within an acceptable time" in Section 5.2.3( 4 ),

first al-decribes a battery sersice test, but no test fre.

quency is specified. IEEE Std 308-1974 does not paragraph, of IEEE Std 308-1974 should be con-specifically mention the battery sersice test.

strued to mean "within a few seconds". A preferred design would include two immediate access circuits it should be noted that the scope of IEEE Std 308-from the transmission network. Detailed guidance 1974 is more limited than that of Criteria 17 and 18.

for operating procedures and restrictions acceptable For example, the scope of IEEE Std 308-1974 ex-to the staff, applicable where two immediate access cludes the unit generator (s) and their buses; step-up, circuits are asailable is contained in Regulatory aus.iliary, and startup transfomers; connections to the Guide 1.93 " Availability of Ekctric Power SourcesJ station switchyard; switchyard, transmission lines; An acceptable design would substitute a delayed ac-and the transmission network, lheept for the unit cess circuit for one of the immediate access circuits generatort s), these are all included w ithin the scope of prosided the availability of the delayed access circuit Criteria 17 and 18.

conforms to Criterion 17.

In the forward to IEEE Std 308-1974 it is noted

b. Ilattiry Charger Supply. The prosisions of !

that certain areas of this standard need more exten-Section 5.3.4 of IEEE Std 30S-1974 should be con-j sise treatment. These include shared systems in multi-strued to mean that the capacity of the battery unit stations, independenet betw een redundant charger supply should be based on the largest com-standby sources, connection of non-Class lE equip-bined demands of the sarious steady-state loads and ment to Class l E sy stems, and the definition of design the charging capacity to restore the battery from the basis esents. Some of these topics have been the sub-design minimum charge state to the fully charged ject of other regulatory guides, e g.,

Regulatory state, irrespectise of the status of the plant durmy Guide 1.6 (Safety Guide 6), " Independence Between w hich these demands occur.

Redundant Standby (Onsite) Power Sources and Between Their Distribution Sy stems," w hich is con-c llattery Performance Diwharge f ests. The test cerned with electrical independe!.ce; Regulatory interval for the battery performance discharge test Guide 1.75, "Phy sical Independence of Electric should be as specified in ll!EE Stc 450-1975 instead Sy stems,' which is concerned with physical in-of the 3 years specified in Table 2. "Illust..itise dependence of Class IE systems and the connection Periodic Tests, of IEEE Std 308-1974. The battery of non-Class IE equipment to Class l E systems; and seruce test described in IEEE Std 450-1975 should he Regulatory Guide 1.81, " Shared Emergency and performed in addition ta the battery performance dis-Shutdown Electric Systems for Muhi-Unit Nuclear charge test. The battery service test should be per-Power Plants.' Other matters of importance to the formed durmg refuehng operations or at some other regulatory process for electric power systems in outage, with intervals between tests not te exceed 18 1.32-2 125 e152

months. The note following Table 2 ofIEEE Std 308-

h. Aiailability of I lettric Pm.cr Sources. Table 1974 should reference IEEE Std 450-1975 rather than

3. "Suegested Operating \\lternathes with Degraded IEEE Std 450-1972.

Class IE Pow er Sy stem Conditions, of IEEE Std 9

308-1974 is considered unacceptaale and should be

d. Independence of Redundant Standh3 Sourecs, supplanted by the recommendatbns of Regulatory Electrical independence between redundant standby Guide 1.93.

(onsite) power source, should be in accordance with Regulatory Guide 1.6. Physical independence should D. IMPLEMENTATION be in accordance with Reculators Guide 1.75.

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The purpose of this section is to proside informa n n m app:ic nts regarding the NRC staffs plans for

c. Connection of Non-Claw II: Equipent to ng tb regulatory gu&

Claw IE Sy stems. The guidance presented in Regulatory Guide 1.75 should be followed.

Except in those cases in which the appl: cant propases an acceptable alternatise method for com-

f. Selection of I)iesel Generator Set Capacisy ior phine with specified portions of the Commission s Standb3 Power Supplies. The guidance presented in re'e u tions, (1) the methods described in portions of Regulatory Guide 1.9 should be followed.

this guide that reference other regulatory guides are beine and will continue to be used in the esaluation

2. The following optional practices are considered of s'ubmittals for censtruction permit applications to be unacceptable as gisen below:

and (2) the methods described in other portions of this guide will be used in the evaluation of submittals

a. Shared Electric Sy stems for M ult i-l ' ni t for construction permit applications docketed after Nuclear Power Plants. The provisions of Section S.2 April 15,1977, unless this guide is resised as a result of IEEE Std 308-1974 which permit sharing of stand-of suggestions from the public or additional staff by power supplies among units of a multi-unit sta-resiew.

tion, are unacceptable except as specified in Regulatory Guide 1.81. The prosisions of Section if an applicant wishes to use this regulatory guide K.3.1 of IEEE Std 308-1974 that permit sharing of in deseloping submittals for applications docketed on battery supplies among units at a multi-unit plant are or before April 15.1977, the pertinent portions of the considered unacceptable and should be supplanted application will be evaluated on the basis of this by the recommendations of Regulatory Guide 1.81.

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