ML18018B640

Forwards Schematic Drawing Re Inadequate Core Cooling Instrumentation,In Response to SER Open Item 14(d) Re Redundancy of Subcooling Monitor.All Parameters Derived from Safety Grade Instrumentation

ML18018B640
Person / Time
Site:	Harris
Issue date:	04/18/1984
From:	Mcduffie M CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NLS-84-180, NUDOCS 8404270167
Download: ML18018B640 (6)

Text

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ACCESSION NBR:84042?0167 OOC.DATE: 84/04/18 NOTARIZED~ No DOCKET ¹ FACIL:50 400 Shear on Har ris Nuclear Power Plantr Unit 1E Carolina 05000400 AUTH ~ NAME AUTHOR AFFILIATION MCDUFFIE<MBA, Carolina.,Powerful Light Co, RECIP,NAMEl RECIPIENT AFFILIATION DENT4NrH ~ RE Office of Nuclear ReactotI Regulat'jonr Director SUBJECT! Forwards schematic drawing re inadequate core cooling instrumentationrin r esPonse to SER OPen Item 14(d) reI redundancy of subcooling monitor,All parameters derived from Isafety grade'nstrumentions DISTRIBUTION CODE:; BOO IS COPIES RECEIYED:LTR,. ENCL J'IZE" 0 TITLE: Licensing 'Submi teal 0 PSAR/FSAR 'Amdts L Related -Cor respondence NOTES!

RECIPIENT ICOPIES" RECIPIENT COPIES IO CODE/NAME~ (.TTR ENCL~ IO CODE/NAME LTTR ENCL NRR/DL/ADL 0 NRR LB3: BC 1 0 NRA LB3 LA 0 BUCKLEYrB 01 1 1 INTERNAI; ELD/HDS1: 1 0 IEI FILE', 1 1

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CÃCG Carolina Power & Light Company SERIAL: NLS-84-180 APB 18 t984 lir. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 DOCKET NO. 50-400 INADEQUATE CORE COOLING INSTRUMENTATION

Dear Hr. Denton:

Carolina Power & Light Company (CP&L) hereby subraits the following information concerning the Shearon Harris Nuclear Power Plant (SHNPP) inadequate core cooling instrumentation. This information is submitted in response to the SHNPP Safety Evaluation Report Open Item 14(d). This information responds specifically to a question from the Core Performance Branch reviewer concerning redundancy of the SHNPP subcooling monitor.

The Reactor Coolant System (RCS) subcooling information at SHNPP is calculated by one of the two 100 percent redundant ERFIS computers (ERFIS comp'ter A or B). See the attached drawing for additional system details. The ERFIS computers are integrated process and emergency response computers with a minimum availability of 99 percent. The two ERFIS computers calculate the saturation temperature corresponding to the RCS wide range pressure. In con)unction with this, ERFIS computers A and B both screen all 51 core exit thermocouples (T/C) and calculate the average core exit: temperature in the hottest core quadrant. The value is auctioneered high with the RCS loop wide range T RTD's. The auctioneered TH is compared with the calculated saturation temperature t:o derive the subcooling margin. Those calculations are updated at a minimum of once every 30 seconds. Additionally, all of the parameters are derived from safety grade inst:rumentat:ion The margin t:o subcooling can be displayed on the SPDS and any of the control room CRT's.

The margin to subcooling is also continuously'recorded in the ERFIS archive for historical reviews.

If you have any further questions on this subject or require additional information, please contact our staff.

Yours very truly, bf. A. HcDuffie Senior Vice President Nuclear Generation JHE/ccc (9872JHE) cct Hr. BE C. Buckley (NRC) Hr. Wells Eddleman Hr. G. F. Maxwell (NRC-SHNPP) Dr. Phyllis Lotchin Hr. J. P. O'Reilly (NRC-RII) Hr. John D. Runkle Nr. George Schwenk (NRC-CPB) Dr. Richard D. Wilson Hr. Travis Payne (KUDZU) Hr. G. 0. Bright (ASLB)

Nr. Daniel F. Read (CHANGE/ELP) Dr. J. H. Carpenter (ASLB)

Chapel Hill Public Library Nr. J. L. Kelley (ASLB)

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