ML20204G087
| ML20204G087 | |
| Person / Time | |
|---|---|
| Site: | 05000447 |
| Issue date: | 04/28/1983 |
| From: | Sherwood G GENERAL ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| JNF-027-83, JNF-27-83, MFN-076-83, MFN-76-83, NUDOCS 8305020355 | |
| Download: ML20204G087 (48) | |
Text
{{#Wiki_filter:GENERAL $ ELECTRIC NUCLEAR POWER SYSTEMS DIVISION GENERAL IC OMPANY,1 5 RTNER AVE., SAN JOSE, CAL!FORNIA 95125 April 28, 1983 U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, DC 20555 Attention: Mr. D.G. Eisenhut Division of Licensing Gentl emen:
SUBJECT:
IN THE MATTER OF 238 NUCLEAR ISLAND GENERAL ELECTRIC STANDARD SAFETY ANALYSIS REPORT (GESSAR II) DOCKET N0. STN 50-447 RESOLUTION OF SER OUTSTANDING ISSUE ON POSTACCIDENT MONITORING INSTRUMENTATION Attached please find a proposed resolution to the GESSAR II SER outstanding issue pertaining to postaccident monitoring instrumentation. It is anticipated that the information is sufficient to move this issue into the confirmatory category. If you have any questions please call R.W. Strong of my staff (408-925-1728). Sincerely, Glenn G. Sherwood, Manager Nuclear Safety & Licensing Operation Attachment cc: F.J. Miraglia (w/o attachment) C.0. Thomas (w/o attachment) D.C. Scaletti L.S. Gifford (w/o attachment) 8305020355 830428 PDR ADOCK 05 4y E
Notes Re: Justification of R.G.1.97 Deviations in GESSAR II, Section ID The following information is provided for each Deviation:
- 1. GESSAR Reference
- 2. Problem Statement - Key concerns with variable regarding specifications in the guide
- 3. Deviation statement - GE position
- 4. Justification - key points supporting position
- 5. Supporting figures - GESSAR figures marked to show subject instrumentation or pertinent material. (figure numbers shown in brackets C])
pdk 4/27/83 e
a POST ACCIDENT MONITORING RG 1.97 (REV, 2) OPEN ITEMS o COMPLY WITH RG 1.97, REV. 2 o JUSTIFY EACH DEVIATION GESSAR II STATUS o SUBMITTED NOV 1982 o 43 BWR VARIABLES ASSESSED 10 - APPLICANT TO ADDRESS ifM - JUSTIFIED WITH DEVI ATIONS - p 2- It j# - FULL COMPLIANCE o 3 DESIGN CHANGES UNDER REVIEW -
"','l''[
RV: PES /113E-17 4/19/83 -
_m_ _. POST ACCIDENT MONITORING peu r s p JUSTIFICATION OF DEVIATIONS FROM GUIDE DEVIATIONS VARIABLES BASIS o ALTERNATE VARIABLE MSIV LCS PRESS. MEETS INTENT (6 VARIABLES) RHR HR TEMPERATURE OF GUIDE SLC FLOW VENT FLOW LPCI FLOW CONT. SPRAY FLOW o ALTERNATE RANGE RPV LEVEL EPGs AND HUMAN (5 VARIABLES) CONT. PRESSURE FACTORS TASK N ANALYSIS SP WATER LEVEL DW AIR TEMP. o f!0T PROVIDED INCORE TEMPERATURE INTENT MET BY (3 VARIABLES) COOLANT RADIATION OTHER RG 1.97 SUMP SAMPLES VARIABLES o ALTERNATE DW SUMP LEVEL BACK UP VARIABLES CATEGORY SLC TANK LEVEL (2 VARIABLES) RV: PES /113E-19 4/19/83
~
GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable : NEUTRON FLUX GESSAR Sections: I D. 2. 3.1 PROBLEM See Next Page DEVIATION New System Added k I I I l I l 1
/e cng m ~e.
~se WIDE RANGE NEUTRON MONITOR (WRfitD PROBLEM: o IRM/SRM DRIVES & CABLING NOT GUALIFIABLE o NEEDED FOR POST ACCIDENT REACTIVITY f10NITORING o FIELD MAltlTENANCE SOLUTION: o 8 FIXED INCORE DETEC, TORS o flew ELECTRONICS /CABLIflG (*"'/'">
0 EXISTIflG DISPLAYS / ous E-#J STATUS: o PROTOTYPE TEST STARTING NOU 8 o AVAILABLE 1974 RV: PES /113E-21 4/19/83 ?
GESSAR II Regulatory Guide 1.97 Assessment i Deviation Justification l Variable: MSIV LCS Pressure GESSAR Section: 1D.2.3.21 l relief 6.7-la,b
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PROBLEM e Table 1 (R.G.1.57) specifies LCS Pressure (0-15" H2 O or 0-5 psid) e GESSAR is positive Leakage Control e Pressure is ambiguous because of unpredictable leak rate DEVIATION e MSIV LCS FLOW considered as alternate variable (FRS R607, FRS R627) JUSTIFICATION e Indication of high Flow (PSIV excess leakage) or zero flow indicates system malfunction
GESSAR II 238 NUCLEAR ISLAND
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GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable: RHR Heat Exchanger temperature GESSAR Section: 1D.2.3.23 ref f. 5.4-12a,b,c PROBLEM e RHR temperature recorder (TRS R601) not qualified (environmental or seism {ic)5.4-12a] e Non-Essential Power used DEVIATION e RHR service water flow (FI R602A,B) ~f9.2-la} considered an alternate variable JUSTI FICATION e Meets all category 2 requirements e Positive indication of heat removal capability
GESSAR II 238 NL' CLEAR IS
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- Regulatory Guide 1.97 Assessment Deviation Justification Variabl e: SLC Flow Ref: f 9.3-5 GESSAR Section: 1. D. 2. 3. 2 5 PROBLEM e No flow indication provided e Flow meter could cause flow blockage DEVIATION e SLC Pressure considerfd an alternate variable (PI R600) ((9.3-5J JUSTIFICATION e Indicates proper system function high pressure indicates flow blockage
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GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable : Vent Flow Rate GESSAR Section: 1D.2.3.34 (SGTS Common Vent)
#ef. f 6 F-l PROBLEM e No SGTS Flow monitor in design .
(Isokinetic Probe provided by applicant) @6.5-1, DEVIATION e Damper position is an alternate variable [f6.5-[ JUSTI FICATION e Indication in control room f7A.3-9f e Design flow rate may be used for release assessment if isokinetic flows are unavailable. I l r a
GESSAR II 22A7007 238 NUCLEAR ISLANQr Rev. 0
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r GESSAR II Regulation Guide 1.97 Assessment Deviation Justification Variable : RPV Level GESSAR Section: 1D.2.3.4 Ref: fig 5.1-3 PROBLEM e Mechanical Separation above wide range not .. . possible (single dome reference pot) f 5.1-3c o High water indication not a safety concern (with good L8 trips on High Pressure Systems) (only needed for LSPG contingency 5) e Table 1 (R.G.1.97) specifies range to centerline of steam line DEVIATION e Alternate range for Category 1 indication is to top of wide range zone JUSTIFICATION e Existing shutdown range is adequate to main steam lines (meets category 3) NOTE: Deviation assumes Enhanced Level Instrument (ELI) to meet the intent of R.G.1.97.
r GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable: Incore Temperature GESSAR Section: 1D.2.3.4 PROBLEM e No incore temperature measurement e Table 1 (R.G.1.97, Rev. 2) specifies incore thermocouples e Table 1 (R.G. l.97 Draft 1, Rev. 3) specifies incore temperature (considered pending further development) e No diverse indication of core cooling e Indication of inadequate core cooling required (NUREG 0737 II.F.2) (approach to, onset, recovery from) DEVIATION e RPV water level measurement satisfies requirements for core cooling indication JUSTIFICATION e Enhanced water level (ELI) provides unimloijosos indication of approach to and existance of ICC e EPG's provide operator actions to prevent ICC o ELI Third division eliminates need for diversity e ELCS Flow indication provides indication of recovery from ICC. (NED0 24708A Analysis Supports) 1
pe.s is.~ c was s w a- _ mor ENHAtlCED LEVEL IflSTRUMEflT (ELI) PROBLEM: o FUEL 20flE N0ff-SAFETY 0 AMBIGUOUS INDICATION IIITH CONFLICTIflG CHANNELS o P00R ACCURACY UNDER OFF-CALIBRATION CONDITIONS o fl0 DIVERSE INDICATION (INADEQUATE CORE C 0 0 L I f!G M 0 flI T O R ) (F --ee e 5 4 i-) SOLUTION: o 3 CLASS 1E MECHANICAL DIVISIONS o BOTT0f1 CORE PLATE TO AB0VE NORf1AL RAtlGE o COMPENSATI0fl FOR: RPV PRESSURE DRYWELL TEMPERATURE o ALARMS TO PROMPT OPERATOR BOILING / FLASHING CHANNEL MISMATCH LEAKING EQUALIZER OR LINE BREAK STATUS: o DESIGN DEFINED o COMMERCIALLY AVAILABLE o OTHER LEVEL SYSTEM FEATURES LIMITED SENSING LINE DROP ORIFICES NEAR DRYWELL WALL NON-SAFETY HIGH WATER LEVEL MONITORS RV: PES /113E-20 4/19/83 17 6
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GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification ' Variable: Containment Pressure GESSAR Section: 1 D. 2- . 3.12 Ref: fig 9.4-6 PROBLEM e Table 1 (R.G.1.97) specifies 4 x Design Pressure Range (= 60 psig) e Existing Range is 2 x Design Pressure (= 30 psig) e Ultimate Containment Pressure is 58 psig per BWR/6 PRA. e No indication of Containment Failure e No recording of indication DEVIATION e Existing range and method of indication is adequate JUSTIFICATION : - 35 hrs available before reaching top of indicating range - time available to open MSIV's or reestablish containment cooling. {T18.2-3a}
- Trend information is useful, but not essential to follow EPG's POTENTIAL e Change Design to 0-60 psig range ALTERNATE Change pressure indicators to recorders (R.G.1.97 Rev. 3 requires all category 1 channels to be recorded)
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GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable: Suppression Pool Water Level GESSAR Section: 1D.2.3.9 PROBLEM e Table 1 (R.G.1.97) specifies bottom of ECCS Suction to 5 feet above normal for type c [f5.1,4a markup e Table 1 (R.G.1.97) specifies top of vent to top of wier wall for type d. e GESSAR Design covers 12 foot range to 6 ft 8" above normal water level DEVIATION The existing range is adequate for expected situations JUSTIFICATION Re: Low End of Scale
- Upper Pool Dump initiates at 18'5" (raises water level)
- High suppression pool level causes auto transfer to pumps external to containment to pool ( 20'5")
- Lower tap risks foulin3 following SP,V action or vent clearing.
Re: High End of Scale
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- ADS causes :::: 5' pool rise (within scale of indication) l l
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GESSAR II Regulation Guide 1.97 Assessment Deviation Justification Variable: Post Accident Samples GESSAR Section: 10.2.3.38 l PROBLEM e No sampling capability for Containment er Auxiliary Building Sumps e Table 1, Note 17 (R.G.1.97) specifies that capability should be procied for Release Assessment, Verification or analysis. DEVIATION e Sump samples are not needed JUSTIFICATION e Sumps are isolated (not a source of release) e RPV or suppression pool liquid samples provide indication of extent of core damage o Process radiation monitors are used for release assessment e Analysis of sumps would be ambiguous
GESSAR II Regulatory Guide 1.97 Assessment Deviation Justification Variable: Drywell Sump Level GESSAR Section: 10.2.3.6 Ref: f 7.6-12c,d PROBLEM e Single Channel Sump Monitoring Provided in design e Table 1 (R.G.1.97) specifies category 1 requirements (Redundant, qualified, ster,<* standby power) DEVIATION Category 3 (commercial, single channel) requirements are acceptable JUSTIFICATION e Sumps isolated by accident e Backup indication to Drywell pressure and radiation level e Early indication only NOTE: Equiptent Drain Sump modification is being made
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GESSAR II Regulatory Guide 1.97 Assessment Deviatio_n Justification Variable : SLC tank level GESSAR Section: 1D.2.3.26 Ref: fig 9.3-5 PROBLEM e Single channel, commercial indication in design e Table 1 specifies category 2 requirements (qualified, reliable power) e Improved ATWS 3A design is narrow range only e Air supply reliability not assured with containment isolation DEVIATION e Present design is adequate JUSTIFICATION e Back up variable to SLC pressure e Air supply reliability is assured until isolated air supply . bleeds off f 9.3-5
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