ML19253C132
| ML19253C132 | |
| Person / Time | |
|---|---|
| Issue date: | 11/14/1979 |
| From: | Kane W NRC - TMI-2 BULLETINS & ORDERS TASK FORCE |
| To: | NRC - TMI-2 BULLETINS & ORDERS TASK FORCE |
| References | |
| NUDOCS 7911300026 | |
| Download: ML19253C132 (11) | |
Text
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NOV 141979 OWNERS GROUP:
WESTINGHOUSE OPERATING PLANTS OWNERS' GROUP
SUBJECT:
SUIEARY OF MEETING HELD ON OCTCBER 25, 1979 TO DISCUSS GUIDELINES FOR EMERGENCY OPERATING PROCEDURES A meeting was held on October 25, 1979 with the Westinghouse (W) Operating Plant inners' Group at the W offices in Monroeville, Pennsylvan_ia. The purpose of the meeting'was to discuss the criteria to be specified in the guidelines for termination of high pressure injection (HPI) flow and tripping of the reactor coolant pumps (RCPs).for small-break loss-of-coolant accidents.
The persons attending the meeting are listed in Enclosure 1 to this sumary. A copy of each of the viewgraphs used by the W Operating Plants Owners' Group is s.
included in Enclosures 2 thru 4.
A summary of the matters discussed at the meeting is provided below.
1.
HPI Termination Criteria I&E Bulletin 79-0.6A, item 7, requires that operating procedures on W operating plants currently, or are revised to specify that if the HPI system has been automatically actuated because of low pressure condition, it must remain in operation until either1 (1) Both low pressure injection (LPI) pumps are in operation and flowing for 20 minutes or longer; at a rate which would assure stable plcnt behavior; or (2) The HPI system has been in operation for 20 minutes, and all hot and cold leg temperatures are at least 50 degrees below the satur-ation temperature for the existing reactor coolant system pressure.
If SG degrees subcooling cannot be maintained after HPI cutoff, the HPI shall be reactivated. The degree of subcooling beyond 50 degrees and the length of time HPI is in operation shall be limited by the pressure /t'emperature considerations for the vessel integrity.
The W Owners' Group criteria for HPI termination are provided in the letter C. Reed to D. Ross dsted 10/16/79 which provided guidelines for the following:
(a) E Imediate Actions and Diagnostics (b) E Loss of Reactor Coolant (c) E Loss of Secondary Coolant (d) E Steam Generator Tube Rupture The staff summarized the basic problems it had with these guidelines.
The first was the absence of any subcooling criteria in the termination criteria. The second was that HPI termination criteria varied C
,1442 100 N6 29
-2 NOV is 1979 depending upon the particular guideline.
The W Owners' Group stated that they had made a modification to their guidilines to include a requirement to attain 50 degrees subcooling.
(see Enclosure 2). The staff did not agree that this change was sufficient since the subcooling requirement was not part of the HDI temination criteria and that HPI temination could occur in instances where there was inadequate core cooling.
The W Owners' Group in Enclosure 3 summarized their assessment of the advaiitages and disadvantages in including the 50 degrees subcooling as part of the HPI termination criteria. The main problem seemed to center around the potential for increased challenges to the pressurizer safety valves._,They_20]nted out that.50 if6grees subco6 Ting'indii:ated wduld be "
requi' ed to account for~measuredie_nt' uncertainties to assure the system r
_was_subsooled,_ Enc 1osare 4 summarfzes~tYe subccTing-tfiat~wouId ~ exist-for several conditions of natural circulation.
The staff stated that they appreciated the concern regarding increased potential for challenges to the pressurizer safety valves.
In this regard, we inquired whether a subcooling criteria (albeit less than 50 degrees) could be used.in the HPI termination criteria while maintaining the remainder of the revised guidelines which require the operator to take action to achieve the required 50 degrees subcooling imediately after terminating HPI.
In response, the W Owners' Group proposed to add to its HPI termination criteria for guidelines E-0 and E-1 a requirement to have subcooling equel to or greater than that which exists during normal operation.
This wculd be a plant-dependent number on the order of 15 degrees. The W Owners' Group also agreed to use similer HPI termination criteria for the other guidelines. The staff agreed that this would be acceptable pending appropriate documentation.
2.
RCP Trip Criteria I&E Bulletin 79-06C requires that upon reactor trip and initiation of HPI caused by low reactor coolant system pressure, imediately trip all operating RCPs.
The W Owners' Group summarized their criterion for RCP trip i.e.,
1250' psia. They noted that the bases are described in WCAP-9584 and 9600.
They stated that the basis for the criterion is that as long as the RCPs are shut off before the break is uncovered their operation cannot aggravate the event.
The W Owners' Group then sumarized the bases for RCP setpoint determination-as follows:
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NOV is 1979 (1) Effect of Continuous RCP Operation (a) Higher mixture levels in the RCS (b) Prolonged liquid inventory loss thru the break (2) Effect of RCP Tripping (a) Before break uncovers when RCPs are not running - no penalty (b) After break uncovers when RCPs are running - benefit (c) Between a and :.b-no penalty (3) Break will not uncover until well after the high points in the RCS have begun draining.
(a) Pressurizer drains, then (b) Vessel drained to same level as the hot leg nozzle, then
(.c) Steam generator draining begins, then (d) Break uncovers (4) Steam generator draining initiates upon reaching saturation pressure in the top of the steam generator.
They stated that steam generator tube saturation pressure is the key to RCP Trip.
(1) While the RCPs are running and before saturation pressure is reached in the S/G tubes, heat transfer is by forced circulatiqn of subcooled liquid:- excellent heat transfer (UA = 50,000 BTU /secA -ft.)
(2).following reactor trip, hot leg fluid temperature falls to
'No Load T with decay heat. At 2 minutes TH0T = TSAT SG + 20F.
H0T (3) No loat T H0T depends on S/G secondary conditions (a)
If offsite power is lost, S/G may be riding on safeties (1200psiaorless)
(b)
If offsite power is available S/G may be controlled automatically to no load condition (< 1200 psia)
(c)
If offsite power is available, the operator may be cooling down the S/G ( <1200 psia)
(4) In the worst case S/G tube saturation pressure is the setpoint of the safeties on the secondary side.
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NOV is 19 / 9 There was general agreement between the staff and Westinghouse on this approach.
However, two difficulties remained to be resolved. These were (1) the safety valves to be used in arriving at the set point, i. e., whether the valves with lower setpoints could be used on the basis that only they would be needed to remove decay heat (2) the accuracy to which these set points could be determined and (3) addi-tional uncertainties due to line losses, etc.
It was agreed that these three areas would be considered by the W Owners' Group and the staff and that they would be taken up aga?n in a confere'nce call on 10/26/79.
W.
. Kane, Acting Leader Projects Group Bulletins and Orders Task Force
Enclosures:
As stated Distribution:
See W Owners' Group Lists attached
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ENCLOSURE 1 LIST Of ATTENDEES W OWNERS' GROUP D. Waters Carolina Power & Light Company Westinghouse l
B. Boloman l
V. Esposito -
C. Faust III W. Johnson H. Julian W. Luce B. King R. Muench J. Schlonski T. Tinnons C. Tuley T. Zordan ACRS Staff P. Boehnert NRC STAFF S. Israel Z. Rosztoczy 1442 i04 B. Sheron W. Kane
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ENCLOSURE'.2 IEP_.3 D MITOR EllER TE AVEPME TBPERATWE INDICATIGI 0F CDE EXIT TERDC0lPES (IF AVAllRlB OR Al.L WIE IWE EAODR QRANT TBTEIRTUE T M TO Wf EAT E N H
IS AT IBST 5(PF LESS TIM SATUMTIm TBTEPATIE AT RCS INDICATEDPPESSWE.
IF 50UF INDICATED SWC00 LIE IS fDT NERIFIED TEN ATIBPT TO ESTABLISH E&SSARf SEC00 LIE BY STFM IIPP Fim TE STFM EERAT0lE TO TE CREEER OR TE ATF0SPEE.
CAlITIm:
IF S1FA IIPP IS EESSARY, EDUE THE STEAM EEFATOR PESSIE 200 PSI EElfd THE LOWEST STEAM SAEIY VALNE SEIPOINT #ID mINTAIN A EACTOR C00LANT C00LDOWN PATE 0
E NO P0E TP#150 F/HR, CmSISTENT WITH PLANT ME-IP CAPABILITY.
IF SdDF INDICATED SEUXLING C#!DT BE ESTABLISED OR MINTAIED
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1EN 19NUALLY EINITIATE SAEIY INJECTION, GD TO SECTION D OF E-0 TO E-EVALUATE TE EVENT, ifLESS THIS E-EVALUATION HAS AIKOf IEEN PEFfGED.
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EE EOSURE 3 NATIEM. CIRCllATION TBPEPATUES TIE (MINtfiED AT'(U)
T}{**(F).
F
.10 m M 39 606 '
30 M E 33 600 60 M M 30 597 IF AT10 NNUIES T i
0 606 F AND INDICATED H
R3 PESSLE IS: I?BIGTED 2000PSIET 635l8CPF.'. AT
=29'l8F 0
MT 2100PSIETMT 82l76 F ~. ATg a36.76PF INDICATED 2200PSIET 6@,h5PF ~- AT
= 16A5 F MT g
INDIGTED
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EPESSIRIZING SG 2(D PSI BElm SAETY VM SET PESSlFE 0
INCEASED ATSB BY 22.61 F INDIGTED U
SASED m 65 F R11 POER aT
- SG PESSlFE AT StfElY VM SET PESSlFE OF 1200 PSIA 1442 106
e ENCLOSURE 4 PUGENT OF INDICATED SIIE00 LING GITERIA IN SI TERMIFATIW GITERIA" ADNTAE:
- PDHriAL CYQ.ING OF SI PilPS DISAD#NTAGE:
- SEIY INETION EHN05 SIE000UNG
- HIGi P!GABILITY OF UFTING PESSIRI2ER SAFEIY VALNE IN SI EINITIATIM GITERIA AD#NTM:
- GINES (FEPATOR OPPORIMIT( TO ESTABUSH EESSARY StBCDOLING 2 SEIY INETIm IS MIT EENCING StBG0UNG 2 EI1XES PREABILITY OF UFTING PESSIRIZER SAFETIES P!bVIIES POIEhTIALVERIFICATIm &
STECTIVEESS OF SG EAT SINK
~, -
DISADnTAGEi
-PDFrIAL CYCUNS OF SAFEIY INETIm pyg 3442 107 e
WESTINGHOUSE OWNERS GROUP PRINCIPAL CONTACT LIST -
Mr. Alan R. Barton Mr. George T. Berry, Executive Director Senior Vice-President Power Authority of the State of New York Alabama Power Company 10 Columbus Circle P. O. Box 2641 New York, N. Y. 10019 Mr. J. A. Jones Hl. F. P. Librizzi, General Manager Senior Vice-President Electric Production, Production Oept.
Carolina Power & Light Company Public Service Electric & Gas Company 336 Fayetteville Street 80 Park Place, Room 7221 Raleigh, North Carolina 27602 Newark, N. J.
07101 Mr. Cordell Reed Mr. W. L.'Proffitt Assistant.Vice President Senior Vice-President - Power Connonwealth Edison Company Virginia Electric & Power Co.
P. O. Box 767 P. O. Box 26666 Chicago.Tllinois 60690 Richmond, Virginia 23261 Mr.SolBuistein,ExecutiveVice-President Mr. William J. Cahill, Jr.
Wisconsin Electric Power Company Vice-President
' ConsoTidated Edison Company 231 West Michigan Street Milwaukee, Wisconsin 53201 of New York, Inc.
New York, N. Y. 10003
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Mr. Eugene R. Mathews, Vice-President Power Supply & Engineering Mr. C..Al.- Odnn, Vice-President Wisconsin Public Service Corporation
. Operations Division h"N" h E"~
e ay, consin 54305 x
nue Pittsburgh. PA.
15219 Mr. Rober'. H. Groce, Licensing Engineer Yankee Atomic Electric Company Dr. Robert E. Uhrig. Vice-President 20 Turnpike Road Advanced Systems and Technology Westboro, Mass. 01581 Florida Power & Light Co.
P. O. Box 529100 Mr. W. G. Counsil, Vice-President Miami, Florida 33152 Nuclear Engineering & Operations Connecticut Yankee Atomic Power Co..
Mr. John Dolan, Vice-President P. O. Box 270 Indiana and Michigan Electric Company Hartford, Connecticut 06101 Indiana and Michigan Power Company P. O. Box 18 Mr. Leon D. White, Jr., Vice-President 3cwling Green Station Electric & Steam Production New York, New York 10004 Rochester Gas & Electric Corporation ~
89 East Avenue 4r. L. O. Maye'r, Manager Rochester, N. Y. 14649 Juclear Support Services Mr. James H. Drake, Vice-President
- orthern States Power Company Southern California Edison. Company 414 Nicollet Mall - 8th Floor 2244 Walnut Grove Avenue-P.O. Box 800
'iinneaspolis, Minnesota 55401 Rosemead, California 91770
.lr. Charles Goodwin, Jr.
Assistant Vice-President j44} }%
3crtland General Electric Company 121 S.W. Salmon Street
?ortland, Oregon 97204
Westinghouse Owners Group Representatives ~
Husain Herman Thrash s.(ankee Atomic Electric Company Alabama Power Company
' 20 Turnpike Road 600 North 18th Street c;estboro, Massachusetts 01581 P. O. Box 2641 Birmingham, Alabama 35291
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Rik W. Wells
";ortMeast Utilities George Liebler
?.. Box 270 Florida Power & Light Co.
dartford, Connecticut 06101 P. O. Box 529100 Miami, Florida 33152 Robert W. Jurgensen American Electric Power Service Corp.
2 Broadway Mark Marchi New York, New York 10004 Wisconsin Public Service Corp.
P. O. Box 1200 Green Bay, Wisconsin 54305 W. Ji Cahill Consolidated Edison 4 Irving Place F. Pat Tierney, Jr.
Ndw. York,.N. Y.
10003 Northern States Power Co.
Route 2 Welch, Minnesota 55089 Peter W. Lyon Power Authority of the State of New York Roger Newton 10 Columbus Circle Wisconsin Electric Power Co.-
New York, New York 10019 231 West Michigan Milwaukea, Wisconsin 53201 John A. Ahladas Virginia Electric & Power Ccmpany Cordell Reed One James. River Plaza Comonwealth Edison Co.
P. O. Box 26666 P. O. Box 767 Richmond, Virginia 23261 One First National Plaza Chicago, Illinois 60690 Frank P. Librizzi ar Public Service Electric & Gas Co.
Ge era Electric Company W$ $
wa t.rsey 07101 ta n
204 SJerry G. Haynes Southern California Edison Co.
r1 a ver & Light 2244 Walnut Grove Avenue Rosemead, California 91770 Ral g Nr Carolina 27602 Jim Gormly Pacific Gas & Electric Co.
Duq es ght 77 Beale Street j
San Francisco, California 94106 i pingpo PA.
15077 Robert Meeredy Bill Layman Rochester Gas & Electric Electric Power Research Institute 39 East Avenue 3412 Hillview Avenue Rochester, N. Y.
14649 Palo Alto. California 94303 1442 109
rage e ur
_4 pages
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Westinghouse Owners Group Representatives Bob Szalay Atomic Industrial Forum 7101 Wisconsin Avenue Bethesda, Md. 20014 Thomas D. Keenan Vermont Yankee Nuclear Power Corp.
77 Grove Street Rutland, Vermont 05701
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