ML21278A187

2 to Updated Final Safety Analysis Report, Chapter 7, Instrumentation and Control, Section 7.1, Introduction

ML21278A187
Person / Time
Site:	Calvert Cliffs
Issue date:	09/07/2021
From:	Exelon Generation Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML21278A102	List: ML21257A249 ML21257A253 ML21257A254 ML21257A255 ML21257A256 ML21257A258 ML21257A259 ML21257A260 ML21257A261 ML21257A262 ML21257A263 ML21257A264 ML21257A265 ML21257A267 ML21257A268 ML21257A269 ML21257A278 ML21257A281 ML21257A282 ML21257A283 ML21257A284 ML21257A285 ML21257A286 ML21257A287 ML21257A288 ML21257A289 ML21257A298 ML21257A299 ML21257A300 ML21257A301 ML21257A302 ML21257A303 ML21257A304 ML21257A305 ML21257A306 ML21278A106 ML21278A107 ML21278A108 ML21278A109 ML21278A110 ML21278A111 ML21278A112 ML21278A113 ML21278A114 ML21278A115 ML21278A116 ML21278A117 ML21278A118 ML21278A122 ML21278A123 ... further results
References
NEI 99-04
Download: ML21278A187 (1)

Text

7.0 INSTRUMENTATION AND CONTROL

7.1 INTRODUCTION

The plant systems are instrumented to provide information on plant conditions at selected locations, to protect equipment and personnel from undesirable conditions and to control the plant during startup, operation, and shutdown. The pr incipal control station for the plant is in the Control Room.

The plant is started up and shut down under remote manual control. Annunciators, indicators, and recording devices will alert the operator and provide data on plant conditions.

Instrumentation and controls essential to plant safety are located in the Control Room. The instrumentation is arranged in groups on the control boards so that when corrective action is required, all pertinent indicators, recorders, and controllers are within easy reach of the operator. The control board is a duplex benchboard. Visible and audible alarms located on the superstructure over the main control board annunciate and identify abnormal operation conditions. Telephone systems provide both in-plant and external communication. The Control Room is a controlled temperature environment, k ept well within the design ambient temperature requirements of the instruments. The computer room temperature and humidity are kept closely controlled.

To ensure reliability, components of established quality are selected and used in the instrumentation and control equipment. All protec tion systems that actuate reactor trip engineered safety features (ESFs), and auxiliary feedwater (AFW) components are designed to conform to the criteria of Institute of Electrical and Electronic Engineers (IEEE) 279 and those sections that are relevant from the Commis sion's proposed General Design Criteria, as published February 20, 1971. The Diverse Scram System (DSS) does not meet IEEE 279. The requirements for this system are established by 10 CFR 50.62 (Section 7.11). The protection instrumentation consists of four independent multiple channels to permit system testing without reducing the degree of protection provided. Reliable sources of electrical power are provided to ensure safe and reliable plant operation (Chapter 8).

The operation of the reactor within established limits is achieved by its inherent characteristics, instrumentation and control systems, and by oper ational procedures and administrative controls.

Potential departures from these limits are audibly and visibly annunciated in the Control Room.

A Reactor Protective System (RPS) is designed to protect the core and the Reactor Coolant System (RCS) pressure boundary and to initiate reactor trips.

The ESF instrumentation provides the equipment necessary to initiate the required safety features functions. This system also monitors the power sources acting to assure the availability of emergency power for operation of at least the minimum ESFs (Chapters 6 and 8).

This system is provided with the necessary re dundant circuitry and physical isolation so that a single failure within the system would not prevent the proper system action when required. This system is provided with test facilities and alar ms to alert the operator when certain components trip, malfunction or are inoperable. The contr ols are designed to automatically provide the sequence of operations required to initiate ESF operation with or without off-site power available.

There are no RPS and ESFs instrumentation transmitters for which the trip setpoints are within 5% of the high or low end of the calibrated range, or within 5% of the overall instrument design range.

CALVERT CLIFFS UFSAR 7.1-1 Rev. 47