ST-HL-AE-1733, Final Deficiency Rept Re Min Flow Requirements for Low Head Safety Injection Pumps During Certain Postulated Small Break Locas.Initially Reported on 860806.Condition Not Reportable Per 10CFR50.55(e)
| ML20209J218 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/05/1986 |
| From: | Goldberg J HOUSTON LIGHTING & POWER CO. |
| To: | Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CON-#386-645 OL, ST-HL-AE-1733, NUDOCS 8609160210 | |
| Download: ML20209J218 (4) | |
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The Light COE f flouston 1.ighting & Power I!O. Box 1700 llouston. Texas 77001 (713) 228-9211 September 5, 1986 ST-ilL-AE-1733 File No.: G12.330, G2.2 98@RMR*
l Mr. Robert D. Martin l
Regional Administrator, Region IV gg U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 J
j Arlington, Texas 76011 South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning Low flead Safety Injection Pumps Minimum Flow Requirements
Dear Mr. Martin:
Pursuant to 10CFR50.55(e) llouston Lighting and Power Company notified your office on August 6, 1986 of a concern regarding the minimum flow requirements for the Low }{ead Safety Injection Pumps during certain postulated Sraall Break Loss of Coolant Accidents (SBLOCA). This situation was noted during a Westinghouse engineering review of long-term cooling analysis for SBLOCA.
IIL&P has evaluated the concern and concluded that it does not meet the reportability criteria of 10CFR50.55(e). The attachment to this letter constitutes the Final Report concerning the subject matter, If you should have any questions on this matter, please contact i
Mr. C. A. Ayala at (512) 972 8628.
l Very truly yours, of M wM *,
II. Goldberg M_
Group Vice PresMlent, Nuclear i
JSPf/mg
Attachment:
Final Report 8609160210 860905 PDR ADOCK 05000498 S
pon LA/NRC/c g(,-10I 9 ff'O J
llouston Lighting & Power Company ST-HL-AE-1733 File No.: G12.330, G2.2 Page 2 cc:
Hugh L. Thompson, Jr., Director Brian E. Berwick, Esquire Division of PWR Licensing - A Assistant Attorney General for Office of Nuclear Reactor Regulation the State of Texas U.S. Nuclear Regulatory Commission P.O. Box 12548, Capitol Station Washington, DC 20555 Austin, TX 78711 N. Prasad Kadambi, Project Manager Lanny A. Sinkin U.S. Nuclear Regulatory Commission Christic Institute 7920 Norfolk Avenue 1324 North Capitol Street Bethesda, MD 20814 Washington, D.C.
20002 Claude E. Johnson Oreste R. Pirfo, Esquire Senior Resident Inspector /STP llearing Attorney c/o U.S. Nuclear Regulatory Office of the Executive Legal Director Commission U.S. Nuclear Regulatory Commission P.O. Box 910 Washington, DC 20555 Bay City, TX 77414 Charles Bechhoefer, Esquire M.D. Schwarz, Jr., Esquire Chairman, Atomic Safety &
Baker & Botts Licensing Board One Shell Plaza U.S. Nuclear Regulatory Commission llouston, TX 77002 Washington, DC 20555 J.R. Newman, Esquire Dr. James C. Lamb, III Newman & lloltzinger, P.C.
313 Woodhaven Road 1615 L Street, N.W.
Chapel 11111, NC 27514 Washington, DC 20036 Judge Frederick J. Shon Director, Office of Inspection Atomic Safety and Licensing Board and Enforcement U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, DC 20555 Washington, DC 20555 Citizens for Equitable Utilities, Inc.
T.V. Shockley/R.L. Range c/o Ms. Peggy Buchorn Central Power & Light Company Route 1, Box 1684 P.O. Box 2121 Brazoria, TX 77422 Corpus Christi, TX 78403 Docketing & Service Section ll.L. Peterson/G. Pokorny Office of the Secretary City of Austin U.S. Nuclear Regulatory Commission P.O. Box 1088 Washington, DC 20555 Austin, TX 78767 (3 Copies)
J.B. Poston/A. vonRosenberg Advisory Committee on Reactor Safeguards City Public Service Board U.S. Nuclear Regulatory Commission P.O. Box 1771 1717 11 Street San Antonio, TX 78296 Washington, DC 20555 Revised 5/22/86 L4/NRC/o
Attachment ST-HL-AE-1733 File No.: G12,330, G2.2 Page 1 of 2 South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning Low Head Safety Injection Pumps Minimum Flow Requirements I.
Summary On August 6, 1986 pursuant to 10CFR50.50(e), Houston Lighting and Power Company (HL&P) notified the NRC - Region IV of a potentially reportable item concerning minimum flow requirements for the Low Head Safety Injection (LHSI) Pumps during certain postulated Small Break Loss' of Coolant Accidents (SBLOCA). HL&P has evaluated possible scenarios and verified that pump protection is currently addressed via the Emergency Operating Procedures (EOP's).
This item does not meet the reportability criteria of 10CFR50.55(e).
II.
Description of Deficiency As noted on August 6, 1986, HL&P indicated that a low flow situation may occur for the LHSI pumps during certain SBLOCAs after switchover from the injection phase to the recirculation phase occurs. This condition could lead to pump damage. At the end of the injection phase, the Refueling Water Storage Tank (RWST) reaches low level and the LHSI pump suction is switched to the containment sump. The LHSI pump minimum flow line (which was recirculating water back to the RWST) is isolated to prevent transporting radioactive fluids to the RWST.
We have determined that E0Ps adequately address LHSI pump operation during conditions where the RCS pressure is such that inadequate flow for pump cooling exists. The EOPs also address monitoring LHSI pump performance. As the SBLOCA requires primary system make-up at a relatively low rate (i.e. the RUST is emptied at a slow rate), sufficient time is available for the operators to assure that the LHSI pump operating requirements (i.e. RCS pressure, LHSI flow) are observed.
III. Corrective Action The E0Ps address required operator action to assure the LHSI pumps are protected and performing adequately.
Design changes are being evaluated however and may be incorporated to improve system capabilities and operational flexibility.
L4/NRC/e
P" E
e Attachment ST-HL-AE-1733 File No.: G12.330,'G2.2 Page 2 of 2 l
i IV. Recurrence Control I
i As the protection of LHSI pumps is maintained by utilizing the E0Ps, recurrence control is not required (see Corrective Action and Safety Analysis).
V, Safety Analysis For certain low flow conditions during SBLOCA where minimum flow requirements are not satisfied for the LHSI pumps, operator action according to the E0Ps provide for protection of the pumps if the RCS pressure is above LHSI pump injection pressure. -Sufficient time exists for the operators to determine / monitor LHSI pump operating conditions and i
take appropriate action before damage occurs. There fore, this item does not meet the reportability criteria of 10CFR50.55(e).
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