ML043230434
| ML043230434 | |
| Person / Time | |
|---|---|
| Site: | Boiling Water Reactor Owners Group |
| Issue date: | 12/03/2004 |
| From: | Bo Pham NRC/NRR/DLPM/LPD4 |
| To: | Gramm R NRC/NRR/DLPM/LPD4 |
| pham b m, nrr dlpm lpdiv-2, 301-415-8450 | |
| Shared Package | |
| ML043280495 | List: |
| References | |
| Download: ML043230434 (7) | |
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XSRV POSITIC
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-'1 Y RELAXATION IN INDICATION BWR OWNERS LICENSING TOPICAL REPORT
SRV POSITI OUTLINE
- Introduction e Executive St
- SRV Positioi Requiremen
- Justification
- Annual Cost
- Conclusions ON INDICATION LTR immary i Indication Regulatory ts for Elimination of Requirements Burden and Recommendations
SRV POSITI EXECUTIVE SUI
- TMI Accident F and PWR for F
- BWR Plant Dif Requirements
- BWROG LTRI Burdensome F
'ost Accident SRV Indication ferences not Recognized in Provides Basis for Relaxation of kequirements quirements Inconsistent with Safety
SRV POSI1 REGULATORY I
,:
- RG1.97Cate(
- RG 1.97 purpi Boundary Prot
- Original TS re(
- iTS relocates i
-Shutdown no
- Plant commitrT seismic, redun rION INDICATION LTR REQUIREMENTS gory 2 Type D Variable ose provided: Detect Accident, tection quire shutdown for inoperable monitors requirements to TRM longer required ients go beyond requirements -
idant, QA etc
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SRV PC)SITION INDICATION LTR SYSTEM ELIMINATION ACCIDENT DETECTION
- Post accident system not required for accident detection
- ADS or ATWS function not related to flow detection RPV pressures and pool temperature detect position
- Worst case AOO is SRV stays open Results in power reduction, pool heat up and water level reduction Operators will respond to suppression pool heat up Feed-water controls will respond to water level reduction
- RPV pressure and suppression pool temperature provide accident detection Both are RG 1.97 Type A category I variables
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'OSITION INDICATION LTR SYSTEM ELIMINATION BOUNDARY INTEGRITY INDICATION
- o SRV position indication important for PWR's Heat transfer is thru steam generators Primary system integrity from open SRV impacts heat transfer
- BWR cooled by maintenance of water level Loss of inventory from SRV will be compensated by feed water controls
- SRV leakage not a safety issue Primary indication of leakage at most plants is pipe thermocouples
- Plant EOP's do not rely solely on post accident system for actions One of several methods for SRV position including discharge pipe thermocouples, RPV pressure, pool temperature
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SRKV P(
PLANT CO
.Acoustic maintain
- EQ requi
$400k pE
- One Plar 4million
- System N (5.0 man I
)SITION INDICATION LTR ST BURDEN FOR SYSTEM monitors are high cost and difficult to irement drives component replacements at
.r replacement it replaced total system at cost of $2.5 work inside containment adds ALARA dose i-Rem) and outage impacts
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RV POSITION INDICATION LTR
)NCLUSIONS AND RECOMMENDATIONS Post accident system provides no safety benefits for BWR No impact on risk from system PRA does not credit system SRV discharge pipe thermocouples sufficient for operation needs Acoustic monitors provide some operational benefit for some Plants Accident detection and boundary integrity not impacted Acoustic monitors are high cost systems Approval of LTR will provide efficiencies in review of Plant submittals