ML20002A968

Forwards Info Re TMI Requirement II.F.2.Discussion of Thermocouples & in-core Instrumentation,Subcooling Meter & Reactor Vessel Water Level Instrumentation Encl

ML20002A968
Person / Time
Site:	Summer
Issue date:	12/04/1980
From:	Nichols T SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8012090262
Download: ML20002A968 (5)

Text

.L SOUTH CAROLINA 5LECTRic a GAS COMPANY POST C F FIC E BOR 764 CotuMeiA, south CARollNA 292f8 T. C. NicHOLs, J R.

%cr Passiet.1 mao G.co. E secutivt December 4, 1980 na u. cn . . ..

Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission

, Washington, D. C. 20555

Subject:

Virgil C. Summer Nuclear Station Docket No. 50/395 TMI Requirements - II.F.2

Dear Mr. Denton:

As requested by Mr. Tai Huang, South Carolina Electric and Cas Company, acting for itself and agent for South Carolina Public Service Authority, provides forty-five (45) copies of information regarding TMI requirement II.F.2. A discussion of each item is provided below.

1. Thermocouples and In-Core Instrunentation Tne thermocouples and in-core instrumentation are addressed in FSAR Section 7.7.1.9. A detailed description of the generic in-core thermocouple system, including its application to the flux capping system is covered in WCA/-7607, " Topical Report In-Core Instrumentation (Flux-Mapping System and Thermocouples)". Respanses to neu requirements for the sub-cooling monitor inputs are shown on the attached Table 1.

2. Subcooling Meter Complete information on the subcooling meter is given in the attached Table 2.

3. Reactor Vesnel Water Level Instrumentation Schedules for the reactor vessel water level instrumentation are as follows:

Procurement -

Complete Installation - In progress Testing -

March, 1981 1

80 12999 M R

11r. liarold R. Denton December 4, 1980 Page Two If you require additional information, please let us know.

Very truly yours, T. C. Nichols, Jr.

RBC:TCN:rh Enclosures cc: V. C. Summer w/o enclosures G. II. Fischer w/o enclosures T. C. Nichols, Jr. w/o enclosures E. H. Crews, Jr.

D. A. Nauman O. W. Dixon, Jr.

O. S. Bradham l W. A. Williams, Jr.

R. B. Clary A. R. Koon A. A. Smith II. E. Yocom R. Faas J. B. Knotts, Jr.

J. L. Skolds

! B. A. Bursey NPCF/Whitaker File

1 i

TABLE 1 TilERMOCOUPLE SELECTIONS FOR V. C. SU!DfER CORE COOLING MONITORS CIIANNEL A CHANNEL B

. Core Guadrant T/C No. T/C Location T/C No. T/C Location 4

0'-90" T17 J10 T39 11 9 0*-90' T22 K11 T40 111 1 90*-180* T20 K6 T42 L6 90*-180* T21 K8 T43 L8 180'-270'~ T5 E7- T31 E8 180'-270' T13 G6 T38 H5 270*-0' T10 F9 T32 E10 270*-0* T14 11 8 T35 G8 o

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TABLE 2 INFORMATION REQUIRED ON THE SUBC00 LING METER Display Information Displayed (T-Tsat, Tsat, Press. etc.) P-Psat subccoled T-Tsat superheat Display Type (Analog, Digital, CRT) Analog and Digital Continuous or on Denand Analog is continuous Digital is on demand Single or Redundant Display Redundant Location of Display Main Control Board Alarms (include setpoints) See "A" below Overall uncertainty (*F, PSI) Digital 4 *F for T/C; 3*F for RTD Analog 5*F for T/C; 5'F for RTD Range of Display See "B" belev Qualifications (seismic, environmental, IEEE323) Being qualified to applicable requirements of IEEE-323-71 based on instrumcnts meeting required response spectra.

Calculator Type (process computer, dedicated digital or analog calc.) Dedicated Digital If process computer is sued specify availability (% of Time) Not Used Singic or redundant calculators Redundant Selection Logic (highest T., lowest press) Higl.est T for RTD or T/C, Lowest P Qualifications (seismic, environmental, IEEE323) None at present Calculational Technique (Steam Tables, Functional Fit, ranges) Functional Fit Ambient to Critical Eoint Input Temperature (RTD's of T/C's) RTD, T/C and T ref.

Temperature (number of sensors and locations) 8 T/C's per channel 2 hot leg and 2 cold leg RTD's per channel

Table 2 (con't) 4 Input A

Range of temperature sensors 0-700*F for RTD's 0-1650*F for T/C's (see note 1)

Uncertainty

• of temperature sensors ("F at 1) (See note 2) T/C I 3*F RTD 3.9'F Qualifications (seismic, environmental, IEEhj25) T/C - None RTD - 323-74 and 344-75 i

Pressure (specify instrument used) All are Barton model except one diverse wide range - later.

One wide range per channel Range of Pressure sensor Wide range 0-3000 PSI Narrow range 1700-2500 PSI Uncertainty

• of pressure sensors (PSI at 1) (See note 3) i 3% span Qualifications (seismic, environmental, IEEE323) 323-1974 4

1 Backup Capability Availability to Temp & Press Yes

Availability of Steam Tables, etc. Yes i

j Training of operators Yes Procedures Yes

• Uncertainties must address condition of forced flow and natural circulation.

NOTE 1 - Calibration unit rant 1-2300*F.

NOTE 2 - Normal accuracy for T/C since they are not qualified. Accident accuracy for RTD's doe 3 not include channel inaccuracies.

NOTE 3 - Estimated accuracy at conditions expected for small break LOCA based on Il0% of span accuracy for large break LOCA environment. Does not include channel inaccuracies.

"A" - Caution - 25"F subcooled for RTD; 15'F subcooled for T/C.

Alarm - 0*F subcooled for RTD and T/C. 1 "B" - Calibrated Region - 1000 PS1 subcooled to 2000*F superheat Overall - Never off scale.

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