ML20210P729
| ML20210P729 | |
| Person / Time | |
|---|---|
| Issue date: | 08/27/1997 |
| From: | Dromerick A NRC |
| To: | NRC |
| References | |
| REF-PT21-97 NUDOCS 9708270315 | |
| Download: ML20210P729 (4) | |
Text
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A MEMORANDUM 10:
File FROM:
Alexander W. Dromerick
SUBJECT:
RAI RE: PART 21 REPORT FROM COMBUSTION ENGINEERING in response to the staff's oral request for additional information i
concerning a Part 21 report from Combustion Engineering indicating that the energy redistribution factors used in its large-break LOCA analyses do not directly reflect the effects of moderator voiding, and, therefore, are under-predicted by 0.5 to 1.5%, BGE provided the attached response.
Attachment:
As stated 01111LIARIM:
nDocket.Iile3 PUBLIC PDl-1 R/T i
' fd) )f
.lllllilll111lll 9.,pru e y gg t ' % $'Y 9708270315 970827 PDR PT21 ENVC-E 7, f 7-(9pg g 2g.g
0 NRC Verbal Qasetions for Cdvwt CIlft en Energy Redistremeties Faster (ERF) Error, Aes,19,1997 1.
What is the Calvert ClifB Peak Clad Temperstwe (PCT) fbr the ECCS performance analysisofrocord?
2143T 2a.
What is the effect of the error on the value of the ERF7 Based on prellmlamry evabation (u documented In ABB C4 Info Bulletin 97 04 and the assosanted 10CFR21 report), ABB C4 expects that the ERF used in the ECC5 partemance analysis of record (0.94) may be underprodleted by 0.5% to 1.5%.
y c-2b.
What is the sfoot of the error en the PCT 7 h[
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y
$ j De plant specl8c effect on PCT tirr Calvert Cliffs has not boat calculated. Based on I g b g praH= lam y evaluatinn ABB C E expects the PCT to increase approxhnstely 20T to 60T 5 +
t 3a.
What are the vastective actions?
l j De ultimate wwf4 actions will depend on Ibe new EKF and its sillect on the Calvert g l 0
Clifte ECC5 pertemance analysis of tocord. BGE will wo:k with ABB C-E to amiculses tw arw ERF and incorporate the new ERP in the ECCS performance analysis of record h
d ihr Calvert Clifik. Incorpornalen o% new ERF may require mero ressrietive limits on oc 9 Q Peak Linser Host Rate an&or core power peaking, nis, in turn, would reqube changes j
to Ibe Core Operating Limits Report (COIA), and associated plant procedures and j
d I $
"lPoints.
ud J
g J
.E % 3b.
What art Ibe repardrig naguiremones?
I s,;
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BGE will report this issue to NRC in accordance with 10 CPR 50.46. Currently, BOE has met dessemined wbrther the error is "signl6 cant" as discussed in 10 CFR 50.46. Efforts j
are unterway wieb ABB C4 to make this determination.
4 What compensatory snessmus have been taken to amount PCT does not onceed 2200T7 Based on ABS C-E Info Bulletin 97 04, BOR implemented (as a anmpaamatary measurs) revised adadalstrative controls and in. core instrumsat (ICI) alarm setpoints to properve l
the Per calculased in the current ecCs perfbr==, malysis oracord 0 2143T).
ne manianan allowed Peak Linser Heat Rate has been reduced by 0.2 kw/ft when usins i
ICis, and the F.,r limit has been reduced by 2% when using encore detectors. On this basis, BOE has roeconable assurane tbst the ECCS perfbrmance analysis of record remains valid and reisted equipment is OPERABLE.
- TOTAL PA3E.001 **
i MEMORANDUM T0:
File FRON:
Alexander W. Dromerick
SUBJECT:
RAI RE: PART 21 REPORT FROM COMBUSTION ENGINEERING In response to the staff's oral request for additional infomation concerning a Part 21 report from Combustion Engineering indicating that the energy iodistribution factors used in its large-break LOCA analyses do not directly reflect-the effects of moderator voiding, and, therefore, are under-predicted by 0.5 to 1.5%, BGE provided the attached response.
Attachment:
As stated DjjiRIBUTION:
Docket File 9PUBLIC:..
PDI-l R/F 1
I b
,.,-m
.y
..m,.
I NRC Verbal Qasstless for Calvert CMfB en Energy Redhtribetles Factor (ERF) Error, Ael 19,1997 1.
Whai ls Ibe Calvert Cliffs Peak Clad Tessperature (PCT) for the ECCS p-L-ance analysisofreocrd7 2143T 2.
What is the effect of the error on the value of the ERF7 Based on preliminary evahiation (as docum=tal in ABB C E Info Bullette 97 04 and the associated 10CFR21 report), ABB C.E expects that the ERF used in the ECC5 performasee analysis of record (0.94) ney be underpsodicted by 0.5% to 1.5%.
y t-2b.
What is the sfroct of the error on the PCT 7 t
~
R The plant apad& cffect on PCT tur Calvert Cliffs has not been calculated. Based on h p p,H= lamy evaluatim. ABB C E expects the PCT to increase approxhnstely 20T to 60'F 4
g-Y
- 3t.
What are the omroctive acdons?
V J to g
)'3 d
$ ;N
. ne uiiimais.ooe. ave wons wu dopend on a w w and io sasa
= Calven 3
0 Clift ECCS performance ana.lyals of rocord. BGE will work with ABB C-E to amiculses the new ERF and inocrporate the new ERP in the ECCS performanos analysis of record k
d fbr Calvert CEfr Incorporation of the new ERF may require snore asserietive limits on ec q Q Peak Linser Heat Rate an&or core power --aMag: nis, in turn, would require changes to the Core Operating Limla Report (COLR), and associated plant procedures and q
l d
y s@ts, du y
y
~
~
J
? A 36-
= =' 8= r=poreg mtsume?
I K 8 d l I
BOE will report this lasue to NRC in accordance wii 10 CFR 50.M. Currently, BOE has s
i not doestmined whether the arvor is "signincent" as discussed in 10 CFR 50.46. Eftbets are underway with ABB C E to make this t~~tandon.
l 4.
What scope very insasmes have been taken to assure PCT does not exceed 2200'F7 1
i Based on ABB C-E Info Bulletin 97-04, BGR implemented (as a comF'nantary measurs) revised admintarrative controls and lo core instrument (ICI) alarm setpolats to preserve the Per calculated in tbs cumnt ECCS perW e analysk ofrocord (l.a. 2143T).
De anaxinrum allowed Peak Linest Host Ra?e has been reduced by 0.2 kw/ft when using ICis, and the F.,r limit has been reduced by 2% when using excore detectors. On this basis, BGB has reasonable assurance that the ECCS Am analysis of record T
remains valid and related equipment is OPERABLE.
- TOTAL PA3E.001 **
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