L-82-429, Forwards Util Responses to NRC Concerns Re Inadequate Core Cooling Instrumentation,Per 820914 Telcon W/Nrc. Qualification Testing of Heated Junction Thermocouple Sys Scheduled for Completion by 821015

Forwards Util Responses to NRC Concerns Re Inadequate Core Cooling Instrumentation,Per 820914 Telcon W/Nrc. Qualification Testing of Heated Junction Thermocouple Sys Scheduled for Completion by 821015

ML17213A555
Person / Time
Site:	Saint Lucie
Issue date:	10/05/1982
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
L-82-429, NUDOCS 8210130289
Download: ML17213A555 (7)

Text

w REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR;8210130289 DOC OATEN'2/10/05 NOTARIZED'O FAOIL:50 389 St, Lucie Planti UniIt 2< Flor ida Power 8 Light Co, AUTH,NAME AUTHOR AFFILIATION UHRIGr R ~ E ~

Florida Power 8 Light Co, RSC IP, NAME RECIPIENT AFFILIATION EISENHUTIO ~ G.

Division of Licensing

SUBJECT:

For wards, util responses

-to NRC concerns ne inadequate core cooling instrumentationiper 820910 telcon w/NRC, Qualification testing of heated Junction ~thermocouple sys scheduled for completion by 821015, DISTRIBUTION CODE:

00018 COPIES RECEIVED>LTR P ENCL.$

SIZE:,

Li TITLE: Licensing Submittal:.PSAR/FSAR Amdts L Related Correspondence NQTES; DOCKET 05000389 RECIPIENT ID CODE/NAME A/0 LICENSNG lIC BR 43 LA

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+lp FLORIDAPOWER 5 LIGHTCOMPANY October 5, 1982 L-82-429 Office of Nuclear Reactor Regulations Attention:

Hr. Darrell G. Eisenhut, Director Division of Licensing U.

S. Nuclear Regulatory Commission Washington, D.

C.

20555

Dear t1r. Eisenhut:

Re:

St. Lucie Unit No.

2 Docket No. 50-389 Instrumentation for Detection of Inadequate Core Cooling Attached are Florida Power and Light's (FPL) responses to the concerns raised by your staff regarding the inadequate core cooling instrumentation during a telephone conversation on September 14, 1982.

If you have any questions on this submittal, please contact us accordingly.

Very truly yours, Vice President Advanced Systems and Technology REU/RJS/JES/jea Attachment cc:

J:

P. O'Reilly, Region.II Harold F. Reis, Esquire pool

'82i0i30289 82i005

'PDR ADOCK 05000389 "A

pDR PEOPLE..'. SERVING PEOPLE

If 4)

ATTACHMENT Section.II F.2 Provide Inade uate Core Coolin (ICC) Information as follows:

l.

Qualification testing of the heated junction thermocouple system.

~ I

Response

Qualification testing of the heated junction thermocouple system is scheduled to be completed by 10/15/82.

Thd'eport on this testing will be submitted to the NRC by 10/31/82.

2.

Environmental and seismic qualification of the in-vessel and out-of-vessel instrumentation equipment.

Response

Qualification will be handled by the appropriate

branch, there-fore no additional information will.be provided with this submittal.

3.

Modify Emergency Operating Procedures (EOP's) by incorporating ICC in-strumentation into the procedures as appropriate.

Response

Emergency Operating Procedures will be revised to incorporate ICC instrumentation by October 31, 1982.

4.

Proposed Changes to Technical Specifications.

Response

These changes are incorporated into the T. S. submittal of

July, 1982.

I 5.

Description of ICC signal transmission processing and display information.

Response:'CC Si nal Transmission Processin and Dis la Information Sensors for ICC Detection The XCC instrumentation consists of four sensor types.

The sensors include:

1) pressure transmitter on the pressurizer,

2) Resistance Temperature Detectors (RTD) in the hot and cold

legs,

3) pairs of'eated and unheated junction thermocouples (HJTC) arranged in an axial string in the upper plenum, and

4) Core Exit Thermocouples (CET).

Except for the HJTC, these sensors already exist in all C-E designed reactors.

Variables for ICC Indication The signals from the ICC sensors are processed to yield five variables.

The ICC variables include 1) temperature margin to saturation from pressurizer pressure and temperature of RTD, 2) temperature margin to saturation from pressurizer pressure and temperature of'unheated thermocouples in the HJTC,

3) collapsed coolant level above the core, detected by the

HJTC,

4) temperature margin to saturation from CET and pressur-izer pressure, and 5) core exit steam temperature from the CET.

"> ATTACHMENT

. '"'nadequate Core Cool g

formation Pa e

2 Inade uate Core Coolin Associated Si nal Transmission (Ref. Fig. 1.9B-1 in FSAR)

The hot and cold leg temperatures

'(resistance analogs sensed in the control room) are sensed via conventional cabling from the primary (RCS) piping to the control room, where a resistance bridge measures the resistance of the RTD and converts it to a 4 to 20 ma DC analog signal (current) which becomes an input to the Sub Cooled Margin Monitor (SMM).

The pressurizer pressure transmitter provides a

4 to 20 ma DC analog signal from inside the containment to

.the control room via conventional cable.

In the control room this signal is routed to the

EFAS, RPS, and SMM.

These pressure and temperature. signals are now existing instrument measurement channels of which there are 4 each.

h Th'e HJTC and CET's are Chromel/Alumel thermocouples which provide a DC milivolt signal via Mineral Insulated (MI) cable from the reactor vessel to the containment penetration.

Out-side of the containment these signals are transmitted via conventional cables to the control room where they are pro-cessed for the SMM.

(ref. fig. 1.9B-9 FSAR)

The signals from the various sensors are processed and then displayed (see table) on both QSPDS channels SA

& SB.

The QSPDS consists of microcomputers and plasma display uni'ts that are class IE.

Re uirements FPL has co'mmitted to having the SMM portion of the QSPDS for care load.

The remaining portion of the QSPDS will be im-plemented by 5% power.

'I Summar of Processin The following table lists the ICC variables.

For each variabPe, the table summarizes the thermal hydraulic requirements for display, trending and alarm.

ICC Variable Operator Access To Individual Sensor In ut Continuous Trended Dis la Audible Alarm Saturation Margin From RTDs Saturation Margin From HJTC X

X X (1)

X (1)

Saturation Margin From CETs X

X (2)

Collapsed Level From HJTC X

X (3)

ATTACHMENT Inadequate Core Coolx g nformation Pa e

3 0

Summar of Processin Re uirements (Table Continued)

ICC Variable Temperature Prom 'CETs Operator Access To Individual Sensor In ut Continuous Trended Dis la X

Audible Alarm X (2)

(1)

Highest temperature used for trend of Saturation Margin and for alarm oa-approach

'to saturation..

(2)

Alarm only earlier of CET superheat or maximum CET temperature and only

~ after prior saturation

alarm, (1).

(3)

Alarm on first level indication.

6.

Detailed description of SMM system to be used during first cycle.

I

Response

The Saturation Margin Monitor is described in FSAR Chapter 1,

App. 1.9B.B 7.

Description of CET processing and display to be used during first cycle.

Response

The Core Exit Thermocouple system is described in PSAR Chapter 1, App.

1.9B AD.