ML20170A409

Independent Spent Fuel Storage Installation Updated Decommissioning Safety Analysis Report, DSAR-8.1, Rev. 1, Electrical Systems, Introduction

ML20170A409
Person / Time
Site:	Fort Calhoun, 07100256
Issue date:	04/30/2020
From:	Omaha Public Power District
To:	Office of Nuclear Reactor Regulation, Office of Nuclear Material Safety and Safeguards
Shared Package
ML20170A380	List: LIC-20-0005, Independent Spent Fuel Storage Installation, Technical Specification Basis ML20170A382 ML20170A383 ML20170A384 ML20170A385 ML20170A387 ML20170A388 ML20170A389 ML20170A390 ML20170A391 ML20170A392 ML20170A393 ML20170A394 ML20170A395 ML20170A396 ML20170A397 ML20170A398 ML20170A399 ML20170A400 ML20170A401 ML20170A402 ML20170A403 ML20170A404 ML20170A405 ML20170A406 ML20170A408 ML20170A409 ML20170A410 ML20170A411 ML20170A412 ML20170A414 ML20170A415 ML20170A416 ML20170A417 ML20170A418 ML20170A419 ML20170A420 ML20170A421 ML20170A422 ML20170A423 ML20170A424 ML20170A425 ML20170A426 ML20170A427 ML20170A428 ML20170A429 ML20170A430 ML20170A431 ML20170A432 ML20170A433 ... further results
References
LIC-20-0005
Download: ML20170A409 (5)

Text

Page 1 of 5 DSAR-8.1 Electrical Systems Introduction Rev 1 Safety Classification: Usage Level:

Safety Information Change No.: EC 69625 Reason for Change: This section is being updated as part of the design and licensing basis reconstitution project.

Preparer: M.Bakhit Fort Calhoun Station

DSAR-8.1 Information Use Page 2 of 5 Introduction Rev. 1 Table of Contents 8.0 ELECTRICAL SYSTEMS.............................................................................................. 4 8.1 Introduction ................................................................................................................... 4 8.1.1 Design Bases ..................................................................................................... 4 8.1.2 Description and Operation ................................................................................. 4

DSAR-8.1 Information Use Page 3 of 5 Introduction Rev. 1 List of Figures The following figures are controlled drawings and can be viewed and printed from the listed aperture card.

Figure No. Title Aperture Card 8.1-1 Simplified One Line Diagram Plant Electrical System ....................... 54187

DSAR-8.1 Information Use Page 4 of 5 Introduction Rev. 1 8.0 ELECTRICAL SYSTEMS 8.1 Introduction 8.1.1 Design Bases The plant electrical systems were designed to meet demands for electrical energy for control and operation of the Spent Fuel Pool and other supporting auxiliaries during normal operations, and natural disasters.

The plant electrical systems do not meet the definition of Class 1E in IEEE 308-1974 or safety related as defined in 10 CFR 50.2 and are therefore classified as non-safety related.

Throughout the auxiliary building, and the intake structure and electrical duct bank thereto, system elements are of Seismic Class I design as described in Appendix F. General design bases include:

a. (Deleted)

b. Maximum hypothetical earthquake

c. Tornado

d. Flood

e. Missiles

f. Ambienttemperature, and humidity In the event of a maximum hypothetical earthquake, tornado, or flood, the systems ensure safe operation of the Spent Fuel Pool and supporting auxiliaries for purpose of removal and dissipation of decay heat.

For an indication of electrical distribution arrangement see DSAR FIG 8.1-1, Simplified One-Line Diagram, Plant Electrical System.

8.1.2 Description and Operation DSAR PI&D Figure 8.1-1 is a simplified composite, one-line diagram of the plant electrical systems. DSAR PI&D Figure 8.2-1 is a one-line diagram of the switchyard, system interconnections and the adjoining transmission systems.

Two offsite power sources are available. The dedicated offsite 161-kV system is brought in via two 161-4.16-kV transformers. The 345-kV system supplies offsite power to FCS via normally open motor operated main generator/transformer disconnect switch DS-T1 using the main transformer as a stepdown transformer.

Either offsite power source can operate the 4.16-kV buses, 1A1, 1A2, 1A3 and 1A4. Note that there are no required loads remaining on Bus 1A2.

DSAR-8.1 Information Use Page 5 of 5 Introduction Rev. 1 A house service bus can be connected to a diesel-generator.

The diesel generator unit is capable of supplying loads connected to its respective 4.16-kV bus and normally associated 480-Volt system.

The motor operated disconnect switch, DS-T1, permits isolating the obsolete generator from the main transformer and unit auxiliary transformers. DS-T1 being open (normal state), serves the following purpose:

a. (Deleted)

b. The 345-kV system can serve as the normal or backup supply for plant auxiliaries of all categories.

Plant auxiliaries have access to the following sources, in the order listed:

a. 161-kV System: Buses 1A3 and 1A4 are normally connected to the 161-kV supply.

b. Diesel-generator: Power is available as an emergency on site source.

c. 345-kV system: From the switchyard utilizing normally open disconnect switch (DS-T1), and manual reclosure of the 345-kV circuit breaker.

d. The 125-Volt d-c control power supply systems and 120-Volt a-c instrument main buses are provided. The a-c instrument main buses are supplied by means of a d-c/a-c inverter. This control power bus arrangement supports the Spent Fuel Pool and supporting auxiliaries.