ML20053C540
| ML20053C540 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/25/1982 |
| From: | Burwell S Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8206020298 | |
| Download: ML20053C540 (6) | |
Text
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1 R 2 5 1982 Docket Nos.: 50-445 and 50-446 APPLIC#1T: Texas Utilities Generating Company j
j FACILITY:
Comanche Peak Steam Electric Station, Units 1 and 2
SUBJECT:
SUMMARY
OF IEETING ON TRNISFER OF CONTAIHMENT SPRAY SYSTEM FROH ItMECTION TO RECIRCULATION mDE 1
Sutmary A neeting was held at NRC Headquarters, 7920 Norfolk Avenue, Bethesda, Maryland on Wednesday, April 28, 1982. The purpose of the meeting was to present the results of the applicant's recnalysis of the time available for transfer of the containrent spray systems (CSS) from the injection node to the recirculation node. The applicant described the methodology and results of the reanalysis with and without the orifice plates proposed at an earlier ~ meeting on this subject. The analysis showed for either design that the operator had greater than 18 minutes following a large-break loss-of-coolant accident (LOCA); the orifices extend the tine for transfer about one minute. The applicant con-cluded that the differences in CSS performance with and without the orifice plates did not justify the design change to incorporate these devices. The staff aoreed with the applicant's conclusions, provided the staff can concur in the analyses to be submitted by the applicant. The applicant expects to submit the reanalyses by May 17, 1982.
i An attendance list is given in Enclosure 1.
Meetino itinutes The menting opened with a statement by the staff that we understood that-the i
aoplicant was prepared to show that the need for operator action to transfer the CSS from the injection mode to the recirculation mode was greater than 19 l
minutes and we would consider such a showing acceptable for resolution of this outstanding issue on Comanche Peak.
The applicant described their reanalysis of the time available for transfer of the CSS pump suction from the refueling water storage tank (RWST) to the contaiment sump using the handout sheet, Enclosure 2.
In brief, the appli-cant has recalculated the time to empty the RUST taking credit for the change in CSS pump floa as the system head varies. With this refinement in the analysis, the time becores greater than 10 minutes with the system as 8206020298 820525 PDR ACOCK 03000445 A
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Texas Utilities Generating Company 2-
' MAY 2 51982 presently constructed, and only about a minute longer with the proposed orifices.
The staff requested justification of the decrease in CSS pump flow as the system head varies; i.e. the pump test flow versus head curve for the CSS pumps. The analysis should show how the system head varies as a function of time and how the system flow varies as a function of time.
The staff agreed with the applicant that the short increase in_ time purchased by the addition of the orifices in the pump discharge lines does not justify the additional complexity and delays imposed on the system.
The applicant expects to submit the analyses supporting the meeting presentation by fiay 17, 1982.
Original :.iignea by:
Spottswood Burwell S. B. Burwell, Project Manager Licensing Branch No. 1 Division of Licensing
Enclosures:
1.
fleeting Attendance 2.
Containment Spray Systems Transfer Calculations Assumntions 4
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Mr. R. J. Gary Executive Vice President and General Manager Texas Utilities Generating Company 2001 Bryan Tower Dallas, Texas 75201 cc: Nicholas S. Reynolds, Esq.
Mr. Robert G. Taylor Debevoise & Liberman Resident Inspector / Comanche Peak 1200 Seventeenth Street, N. W.
Nuc. lear Power Station Washington, D. C.
20036 c/o U. S. Nuclear Regulatory Commission Spencer C. Relyea, Esq.
P. O. Box 38 Worsham, Forsythe & Sampels Glen Rose, Texas 76043 2001 Bryan Tower Dallas, Texas 75201
!!r. John'T. Collins U. S. NRC, Region IV Mr. Homer C. Schmidt 611 Ryan Plaza Drive Manager - Nuclear Services Suite 1000 Texas Utilities Services, Inc.
Arlington, Texas 76011 2001 Bryan Tower Dallas, Texas 75201 Mr. H. R. Rock Gibbs and Hill, Inc.
393 Seventh Avenue New York, New Ycrk 10001 Mr. A. T. Parker Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 David J. Preister Assistant Attorney General Environmental Protection Division P. O. Box 12548, Capitol Station Austin, Texas 78711 Mrs. Juanita Ellis, President Citizens Association for Sound Energy 1426 South Polk Dallas, Texas 75224
ENCLOSURE 1 MEETING ATTENDANCE MEETING ON TRANSFER OF CSS FROM INJECTION TO RECIRCULATION MODE April 28, 1982 NRC Staff Texas Utilities Services, Inc.
S. B. Burwell J. B. George W. P. Gammill H. C. Schmidt L. G. Hulman F. W. Madden K. C. Dempsey D. W. Wade
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ENCLOSURE 2 CONTAINMENT SPRAY SYSTEMS TRANSFER CALCULATION ASSUMPTIONS 1.
ECCS flows are constant as follows:
RHR @ 4500 gpm SI @ 450 gpm Charging @ 450 gpm Per Westinghouse letter WPT-4128 dated March 4, 1981.
2.
Level instrumentation on PWST has tolerance of + 2%.
3.
Containment Pressure assumed to be 0 psig.
4.
Static head in RWST assumed to decrease in discreet steps.
5.
Available water in RWST is assumed to be the volume contained between the Lo - 2% elevation and the suction nozzle elevation.
i.e. 461, 580 gal.
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MEETING
SUMMARY
iDocumsnicontroli(50-445) & -(501446)5~:,
NRC PDR L PDR TERA NSIC LBf1 Rdg.
MAY 2 51982 MRushbrook Project Manager S. B. Bumell Attorney, OELD OIE Regional Administrator, Region IV PARTICIPANTS (NRC):
S. B. Bumell b
W. P. Gammill P
L. G. Hulman
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1 K. C. Dempsey d
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