ML20005G589
| ML20005G589 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 01/04/1990 |
| From: | Tim Reed Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9001190366 | |
| Download: ML20005G589 (9) | |
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V UNITED STATES i
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January 4,- 1990 i
Docket Nos. 50-321' 50-366 o
m LICENSEE:
Georgia Power Company FACILITY: ' ~ Edwin I. Hatch Nuclear Plant, Units 1 and 2
SUBJECT:
SUMMARY
.OF NOVEMBER' 14, 1989, MEETING' WITH GEORGIA POWER ON THE PROPOSED MSIV CLOSURE TIME TECHNICAL SPECIFICATION AMENDMEtlT J 0n. November 14, 1989, the NRC' staff met with representatives of Georgia Power-
' Company- (GPC) and General Electric to address staff concerns regarding the SAFER Thernal Hydraulic Code)geneous equilibrium model (incorporated into the application of the Moody homo for calculating mass and energy releases following
'La postulated main steam line break (MSLB) outside containnent. The revised
-NSLB integrated mass and energy release calculation was submitted in support of
- a'propused GPC Technical Specification (TS) amendment to increase the main steam l
isolation valve (MSIV) stroke time window from 3-5 seconds to 2-8 seconds.
The stoff's chief concern with the use of the SAFER Code is whether the. new
' calculated ness and energy releases for the MSLB (assuming the increased MSIV stroke time window), accounting for calculation uncertainties, are bounded by the L
current Hatch licensing basis equipment qualification (EQ) curves.
To resolve p
.this concern, the staff requested GPC to address three issues:
1.
GPC should compare the best estimate (including friction effects if l
feasible) integrated mass and energy releases as calculated by SAFER Lu against the current EQ basis curves for the MSLB.
This comparison p
should discuss the uncertainties inherent in the SAFER calculation and L
address whether the SAFER calculation with uncertainties is bounded by L
the current EQ mass and energy release curves.
In this regard, a 1
margin of 20% is thought to be sufficient to bound SAFER calculation uncertainties.
2.
GPC should provide a qualitative argument as to whether existing MSLB temperature versus time EQ profiles bound the temperature versus time profile expected to result from the new mass and energy release estimates calculated using SAFER with an 8 second MSIV closure tine.
3.
GPC should review any existing EQ failure modes and effects analyses for equipment whose environment is governed by the MSLB to ensure that these analyses rennin valid for the new SAFER calculated releases.
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9001190366 900104 PDR ADOCK 05000321 PN U P
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The resolution of the above three concerns should provide an adequate basis for the staff to complete the SER for the proposed GPC TS amendment.
- Meeting participants are ' listed in Enclosure 1. - Slides presented by GPC are provided in Enclosure 2.
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Timothy A. Reed, Project Manager.
Project Directorate 11-3 Division of Reactor Projects - I/II
Enclosures:
As stated-cc w/encls:
- See next page Distribution:-
Docket file T. Collins 8/E/23 NRC & Local PDRs-H. Walker 8/D/1 l
J. Sniezek 12/G/18 M. McCoy 8/E/23 PDII-3 R/F C. Graves NLS 314 11 S. Varga.
14/E/4 OGC (info.. only) 15/B/18 D. Matthews 14/H/25 E. Jordan HNBB 3302 T. Reed-14/H/25 ACRS (10)
P1 135 L. Crocker 14/H/25 R. Borchardt 17/D/19 R. Ingram 14/H/25-0FFICIAL RECORD COPY' vl i
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The resolution of the above three concerns should provide an adequate basis for P
the staff. to complete the Safety Evaluation-for the proposed GPC TS amendment.
Meeting participants are listed in Enclosure 1.
Slides presented by GPC are provided in Enclosure 2.
i :J' Timothy A. Reed, Project Manager Project Directorate II-3' Division of Reactor Projects.- I/II Office of Nuclear Reactor Regulation
Enclosures:
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Georgia _ Power Company
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Shaw, Pittman, Potts and Trowbridge Mr. R. P. Mcdonald L
2300 N Street, N. W.
Executive Vice President -
p Washington,_ D.C. - 20037 Nuclear Operations Georgia Power Company i
Mr. X T.-Beckham P.O. Box 1295 Vice President - Plant Hatch-Birmingham, Alabama 35201' s
Georgia Power. Company P.O. Box 1295 Mr. Alan R. herdt, Chief
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Birmingham, Alabama 35201 Project Branch #3 U.S. Nuclear Regulatory Comission -
Mr. S. J. Bethay 101 Marietta Street, NW, Suite 2900 Manager Licensing - Hatch Atlanta, Georgia 30323 L
- Georgia Power Company 1,
P.O. Box 1295 Mr. W. G. Hairston, III l
Birmingham, Alabama 35201 Senior Vice President -
Nuclear Operations Mr..H. C. Nix-Georgia Power Company General Manager, Nuclear Plant P.O. Box 1295 Georgia Power Company Birmingham, Alabama 35201 Route.1,' Box 439 Baxley, Georgia 31513-
' Resident Inspector U.S. huelear Regulatory Cormission L
Route 1. Box 725 L
Baxley, Georgia 31513 1
' Regional Administrator, Region II.
U.S. Nuclear Regulatory Comission 101 Marietta Street, Suite 2900
-Atlanta, Georgia 130323 Mr. Charles H. Badger _
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~ Office of Planning and Budget Room 610 270 Washington' Street, S.W.
l Atlanta, Georgia 30334 Mr.-J. Leonard Ledbetter, Director Environmental Protection Division Department of Natural Resources 205 Butler Street, S.E.,
Suite 1252 Atlanta, Georgia 30334 Chairman Appling County Comissioners County Courthouse Baxley, Georgia 31513 m
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ATTENDANCE LIST i
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Georgia Power Comparty/NRC
. Proposed MSIV Closure Time Technical Specification Amendment i
ja November 14, 1989 NAME-ORGANIZATION L
Tim Reed NRC/DRP/PD11-3
' Mike McCoy NRC/ DST /SRXB Chuck Graves NRC/RES Harold llal ker NRC/ DST /SPLB l.
Tim Collins NRC/ DST /SRXB
- Gary Sozzi GE Nuclear Energy-Larry Chi.
GE Nuclear Energy Ken McElroy Georgia Power Company i
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NRC/GPC MEETING' PROPOSED MSIV CLOSURE TIME TECHNICAL SPECIFICATIONS
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AMENDMENT NOVEMBER 14, 1989 WHITE FLINT BUILDING 9:00 - 12:00 A.M.
' 0VERVIEW OF MSIV_ CLOSURE TIME SUBMITTAL GPC o
IMPACT:0F SHORTER STR0KE TIME 0
IMPACT OF' LONGER STR0KE TIME IMPACT OF LONGER STROKE TIME ON EQ AND GE RADIOLOGICAL CONSEQUENCES 0; CONSERVATISM IN CURRENT EQ BASIS o
SAFER MODEL QUALIFICATION AND USE OF HEM BREAK FLOW MODEL 0
JUSTIFICATION OF HEM FOR EQ AND RADIOLOGICAL EVALUATIONS DISCUSSION /0 PEN ITEMS ALL I
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OVERVIEW OF
=MSIV CLOSURE TIME SUBMITTAL
.0 JTECHNICAL SPECIFICATIONS (TS) AMENDMENT FOR PLANT HATCH SUBMITTED MAY-13, 1988 O' INCREASED MSIV STR0KE TIME WINDOW FROM 3-5 SECONDS TO 2-8 SECONDS.
OTHER.TS REQUIREMENTS NOT CHANGED 0-LARGER WINDOW MEANS LESS CHANCE OF FAILING QUARTERLY STROKE TIME TEST 0 !FAILING-STROKE-TIME TEST ON INB0ARD MSIV AT POWER CAUSES SHUTDOWN OR OPERATION WITH ISOLATED STEAMLINE 01 BASIS FOR EXTENDING INTERVAL EVALUATED BY GENERAL ELECTRIC AND INCLUDED IN MAY 13, 1988 SudMITTAL OPERATION WITH ISOLATED STEAMLINES REQUIRED IN 1986 & 1987 AFTER FAILING SURVEILLANCE 0402V J.:
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MSIV CLOSURE TIME:(CONTINUED)
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. EXTENDING CLOSURE TIME INTERVAL REQUIRED REVIEW AND REEVALUATION 0F DESIGN. BASIS 0
SHORTER STROKE TIME (3~ SECONDS TO 2 SECONDS) o LONGER STROKE TIME (5 SECONDS TO 8 SECONDS) PLUS' INSTRUMENT DELAY,. TIME-(0.5 SECONDS)
SHORTER STROKE TIME EVALUATIONS INCLUDE:
0 VESSEL OVERPRESSURE PROTECTION 0
THERMAL LIMITS (OTHER TRANSIENT EVENTS)
'O LOCA/ECCS 0
CONTAINMENT 0
STEAMLINE AND MSIV INTEGRITY TO DATE, NRC HAS REQUESTED NO ADDITIONAL INFORMATION.0N THESE EVALUATIONS 0402V
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'MSIV CLOSURE TIME-(CONTINUED) ra' 0 l LONGER STROKE TIME EVALUATIONS INCLUDE:
0.
didA/ECCS 0
TRANSIENTS' 0
CONTAINMENT-O RADIOLOGICAL RELEASE t
O ENVIRONMENTAL QUALIFICATION O'
POSTULATED MSL BREAK OUTSIDE CONTAINMENT INPUT TO EQ AND RADIOLOGICAL RELEASE CALCULATIONS o
o GE REEVALUATED MSLB WITH NEW " SAFER" THERMAL HYDRAULIC CODE r
-O SAFER /GESTR-LOCA APPLICATION METHODOLOGY 0
8:SECOND MSIV CLOSURE TIME o
HEM FOR SATURATED FLUID
-0 : ANALYSIS SHOWED EXISTING (CONSERVATIVE) EQ BASIS (5-SECOND CLOSURE) BOUNDS 8-SECOND CLOSURE IN TERMS OF BREAK-FLOW AND BREAK ENERGY NRC REVIEWERS NOT CONVINCED NEW CALCULATION IS SUFFICIENTLY CONSERVATIVE 0402V
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