ML18037A798

Notifies NRC of Rev to ERDS Data Point Library,Per 10CFR50, App E.Licensee Revised Alarm/Trip Setpoints for Suppression Pool Temp

ML18037A798
Person / Time
Site:	Browns Ferry
Issue date:	03/14/1994
From:	Salas P TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9403220250
Download: ML18037A798 (14)

Text

ACCELERATED DISTRIBUTION DEMONSTPWTION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM'RIDS)

ACCESSION NBR:9403220250 DOC.DATE: 94/03/14 NOTARIZED: NO DOCKET FACIL:50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee AUTHOR AFFILIATION 05000260'UTH.

NAME SALAS,P. Tennessee Valley Authority RECIP.NAME RECIPIENT. AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Notifies NRC'f rev to ERDS data point library,per 10CFR50',

App E.Licensee revised alarm/trip setpoints for suppression pool temp. D DISTRIBUTION CODE: A026D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Emergency Response Data System (ERDS)

NOTES:

RECIPIENT COPIES RECIPIENT COPIES A ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL AEOD/IRB '01 2 2 NRR/PD3-2 1 1 D

'TRIMBLE,D 1 1 D

INTERNAL: ACRS 1 AEOD 1 1 AEOD/DOA/IRB 1 1 ~NRR~S~S PEPB 1 1 OC/LFDCB 1 0 ~RE~QLEQ 1 1 RGN2 ERC 1 1 RGN2 FILE 1 1 EXTERNAL: NRC PDR' D

D D

NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WAFEE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES'EQUIRED: LTTR 13 ENCL 12

II

'J

Tennessee Vatfey Authority. Post Office Box 2000, Decatur, Alabama 35609 BAR < 4 10 CFR 50, Appendix E U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter Of ) Docket No. 50-260 Tennessee Valley Authority ~

)

BROWNS FERRY NUCLEAR PLANT (BFN) - UNIT' REVISION TO EMERGENCY RESPONSE DATA SYSTEM (ERDS) DATA,POINT LIBRARY In accordance with the requirements of '10 CFR 50, Appendix E, Part VI, paragraph 3a, TVA is notifying NRC of a revision to the BFN ERDS Data Point Library. Specifically, on February 14, 1994, TVA revised the alarm/trip setpoints for the, suppression pool temperature (ERDS. point number 24). The specific revisions are provided below.

ERDS POINT NUMBER 24 REVISIONS

1. The "LO" alarm setpoint of 75'F is deleted.

2. The "LOLO" alarm setpoint of 70'F is revised to 50'F.

REASON FOR THE REVISIONS The process computer originally had both "LO" and "LOLO" alarms to indicate abnormally low suppression pool temperatures to the plant operators. TVA determined that the "LOLO" alarm setpoint was too high to be indicative of abnormal temperatures. TVA also determined that the "LO" alarm does not provide meaningful information to plant operators. Accordingly, TVA has deleted the "LO" alarm and revised the "LOLO" alarm to 50'F to more accurately represent abnormally low suppression pool temperatures.

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0 4l U.S. Nuclear Regulatory Commission Page 2 TVA's revised ERDS Data Point Library listing and ERDS Point Number 24, Suppression Pool Temperature, are contained in the Enclosure.

No new commitments are contained in have any questions, please telephone this .submittal.

me at If you (205) 729-2636.

Sincerel Salas Manager of Site Licensing Enclosure cc: See page 3

U.S. Nuclear Regulatory Commission

-Page 3 NAR $ 4 199"-

Enclosure cc (Enclosure):

John R. 'r.

Jolicoeur ERDS Project Manager U.S. Nuclear Regulatory Commission Mail Stop NMBB 3206 Washington, D.C. 20555 Mr., R. V. Crlenjak, Project Chief U. S. Nuclear Regulatory Commission Region 101 II Marietta Street, NW, .Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35611 Mr. D. C. Trimble,. Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. J. F. Williams, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852

4l ENCLOSURE TENNESSEE'ALLEY'UTHORZTY BROWNS FERRY NUCLEAR PLANT (BFN)

UNIT 2 EMERGENCY RESPONSE DATA SYSTEM (ERDS)'ATA

'POINT LIBRARY ERDS POINT NUMBER 24 REVZSZON

'0 BROWNS FERRY UNIT 2 ERDS DATA POINT LIBRARY 1~ NZ POWER RNG SPDS0001 RX POWER APRM COMPOSED 2~ NZ INTER RNG CALC045 AVERAGE OF '

ZRM '

3~ NI SOURC RNG SPDS0041. RX POWER SRM - AVG 4~ REAC VES LEV SPDS0007 RX WATER LEVEL - COMPOSED

5. MAIN FD FLOW CALC040 RFW FLOW TO REACTOR

6. RCIC FLOW 71-36 RCIC PUMP DISCHARGE FLOW 7 ~ RCS PRESSURE SPDS0008 RX PRESSURE - COMPOSED 8~ HPCI FLOW 73-33 HPCZ Pump Discharge Flow

9. LPCI FLOW 74-50 RHR SYS I FLOW 10 LPCZ FLOW 74-64 RHR SYS ZZ FLOW

'1.

CR SPRAY FL 75-21 CORE SPRAY SYS I FLOW 12 ~ CR SPRAY FL 75-49 CORE SPRAY SYS ZZ FLOW

13. CND A/E RAD SPDS0047 OFFGAS POST TREATMENT AVG

14. CND A/E RAD 90-157 OFFGAS PRE TREATMENT AVG

15. DW RAD 90-272C DW RAD-RX 582, 340 DEG AZIMUTH

16. DW RAD 90-273A DW RAD-RX 560, 270 DEG AZIMUTH

17. DW RAD 90-273C DW RAD-RX 582, 190 DEG AZIMUTH

18. MN STEAM RAD 90-136 MAIN STM LINE A RAD LEVEL

19. MN 'STEAM RAD 90-137 MAIN STM LINE C RAD LEVEL

20. MN STEAM RAD 90-138 MAIN STM LINE B 'RAD LEVEL 21 ~ MN STEAM RAD 90-139 MAIN STM LINE D RAD LEVEL 22 DW PRESS SPDS0009 DRYWELL PRESSURE COMPOSED DW TEMP SPDS0010 DRYWELL TEMPERATURE COMPOSED

'3.

24. SP TEMP SPDS0016 SUPPR PL WTR TEMP COMPOSED

25. SP LEVEL SPDS0013 SUPPR PL WTR LVL (ZN) COMPOSED

26. H2 CONC SPDS0017 DRYWELL H2 COMPOSED 27 02 CONC 76-43 DRYWELL OXYGEN 'CONCENTRATION

'8.

CST LEVEL 2-161 CST P3 (UNIT 2) LEVEL

29. .WIND SPEED MET00191M VECTOR WIND SPEED (15 MZN AVG)

30. WIND SPEED MET00246M VECTOR WIND SPEED (15 MZN AVG)

31. WIND SPEED MET00310M VECTOR WIND SPEED (15 MIN AVG)

32. WIND DZR MET00491M VECTOR WIND,DIR (15 MIN AVG)

33. WIND DIR MET00546M VECTOR WIND DZR '(15 MIN AVG)

34. WIND DIR MET00610M VECTOR WIND DIR (15 MIN AVG)

35. STAB CLASS MET007 Stability Class Upper

36. STAB CLASS MET008 Stability Class Intermediate

37. STAB CLASS MET009 Stability Class Lower

38. TYPEDATA REAL/SIMULATED

39. EFF GAS RAD SPDS0024 STACK RELEASE RATE - COMPOSED DENOTES'l.CHANGES'APE!'."CIRCE:<.:'T8EYXXST;-"SOBMIT~~

4l ERDS point number 24. SP TEMP SPDS0016 Suppression, Pool Temperature Date: 03/16/94 Reactor Unit: BF2 Data feeder: 1 NRC ERDS Parameter: SP TEMP Point ZDs SPDS0016 Plant Spec Point Desc: SUPPR PL WTR TEMP COMPOSED Generic/Cond Desc: Suppression Pool Temperature Analog/Digital: A Engr Units/Dig States: DEGF.

Engr'nits Conversionc N/A Minimum Instr Range: 30 Maximum Instr Range: 230 Zero Point

Reference:

, N/A Reference Point Notes: N/A PROC or SENS: P Number of Sensors: 16 How Processed: Average (PSVA)

Sensor Locations: Around Circumference of Torus Alarm/Trip Set Points: All modes: HIHZ~95 HI=93 LOLO=50 NID power cutoff level: N/A NID power cut-on level: N/A Instrument Failure Mode: N/A Temperature Compensation: N Level Reference Legs N/A Unique 'System Desc: There are 4 inputs actually scanned by the computer. 'Two of these 4 are made of 8 individual sensors that are hardware averaged.

The other 2 are selected individual sensors from

,the total 16. sensors.

Ol,