ML20076J870
| ML20076J870 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/31/1978 |
| From: | Dunn B BABCOCK & WILCOX CO. |
| To: | Womack E BABCOCK & WILCOX CO. |
| References | |
| TASK-*, TASK-GB GPU-0618, GPU-618, NUDOCS 8307060535 | |
| Download: ML20076J870 (6) | |
Text
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- , T,H2 BABCOCK & WILCOX C014PANY POWER GENERATION GROUP To l
E. A. t.'ocack. Manazer. Plant Desien Fro.a 3.M. Dunn. Manager. ECCS Analysis (2J38)
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File No.
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Date Julv Aeti71 ties Re l................... port July 31, 1978 Attached please find the July Activities Report for the ECCS Annlysis Unit.
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R.C. Jones L.M. Scalec J.R. Biller l'
H.A. Sailey N
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ECCS A'ZALYSIS UNIT ACTIVITIES RE?OPC July 1978 I.
ACCOMPLISEME'.'TS 1.1 Scheduled Activities A.
Tube Plugging Criteria - 177 Stean Generators - Design Me=o 86-1538-00 was issued on July 7 to trans=1t CHATT2 rsv data and a description of the CRAFT 2 input nodel to supporting analytical units.
Revision 01 to the me=o, containing supple =entary infor-nation on annlysis and reduction of the CRAFT 2 data, was issued on July 31.
The issuance of the revisien 1 docu=ent ce=pletes
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....... the ECCS nnnlytical effort on this program.
A s"--' y report for -
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the Customer will be prepared in August.
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3.
Design Me=o 86-204'4'-00 on subcompart=ent = ass and energy release data for NSS-31 (PASNY) was released on June 30, satt.sfying the July 1 3CTD.
C.
Sensitivity studies are in progress to evaluate the effects on 205-FA reactor internals LOCA loads of a proposed change in the plenum cover design (Dvg 29385), and of changes in the CRAFT 2
. -.=adel input for the upper plenu=.
D, PASNT Jet I=pinge=ent Program - This program is nov vell thead 'of j
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schedule. A total of 84 targets were identified by SMA for this 8
program.
Of the 84 targets transient loads were produced for I2 targets; 2 peak loads enveloped 4 targets; peak loads were pro-duced on 9 other targets; 5 targets were eli=insted by functionally not requiring the surge line for cold leg breaks equal to or less than lA; 12 targets were eld =inated as having negligible loads; 3 targets were eli innted via the Unit's interpretation of the out-of-plane bending criteria; 1 target was eld d ated by shift-ing the load into the cavity pressurization arena; 11 targets were deter =ined by the Unit not to be i.-pinged upon; Standard 205 data were applicable to 21 targets; and 6 targets still re=ain to be considered.
.E. Auto Target Area Code (ATAC) Development Program - This progran continues to make progress.
During the past =onth ECCS input a quarter loop PASNT codel (see attached figures).
Input of sup-ports and restraints as well as area calculations are avatting ce=pletion of the necessary ce=puter software by the Applied Math Unit.
Training of the Group personnel in the use of ATAC, as well as code check out, were initiated this =onth.
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TECO Jet I=pingement Program - Pipe react *. ion force work for LDR's is scheduled to begin 8/1/78.
ECCS currently anticipates using ATAC for this entirt program. This phase should begin about 9/1/78.
C.
205-FA Plant Auxiliary Faedvater Level Control Study - Analysis of the 0.05 ft2 break with a 6-foot level control has been performed utili:ing the proposed sm11 break evaluation model presented to the NRC in May.
Results indicate -'4n4"- core mixture heights in the range of 9b to 10 feet and esti=ated peak cladding temperatures of 1700 to 19007.
NRC has, however, accepted only two of the proposed s 11 break modifica-tions, specifically the two node inner vessel modeling and the phase separation multipliers, and has rejected use of tre Zaloudek subcooled discharge correlation.
Since we vill have to continue to use the Bar-noulli equation to calculate subcooled discharge lates, an additional 1 foot loss of mixture is expected.
This will result in peak cladding temperatures in excess of 2200F.
Thus,,the,6-foot level.. control..is.
inadequate for small breaks. At preser.t, a reporr. in being prepared for higher management demonstrating.the amed for a,11gher_ level.
3 Work is expected to be initiated in early August to start development of an acceptable a =414=ry...fcaduater level. However, no funds are presently available to perform this analysis even though WA's have al-ready been prepared and sent to the Risk PM since June 26th.
Straight-aning out of the funding is being actively pursued.
H.
Simultaneous Rupture of a Cold Leg and Pressurizar Surge Line - Design Memo 86-2123-00 was nisased,-this. month stating that the simultaneous rupture of the PZR Siirge Linei ~cilin be-allowed provided that the cold lag break is IA or less. iThis mano.onlycaddresses.this. accident.. fro =.
a peak cladding temperature standpoint and does not consider other potential. problems, e.g.,.subcompartment, AP,'s,; intan=1 = loads, etc...
1.2 Unscheduled Activities A.
177-FA Lovered Loop Plant Small 3reak Analysis - Last month's progress report stated that the NRC had approved the s=all break modifications presented to the Staff in May and that all analyses in support of 2772 MWt operation had been completed. However, subsequent conversaticus were held with the Staff in early July during which B&W was informed that the proposed subcooled discharge =odel change, from 3ernoulli to l
the Zaloudek correlation, was not going to be approved.
Since this.
change was not approved, an additional small break analysis at 2772' MWt was necessary.
A new small break spectrum was performed using the two approved model changes. The breaks analyzed were 0.15-0.1, 0.085, 0.07, 0.055,
and 0.04-ft2 The 0.08, 0.07, and 0.055-ft breaks uncovered; the 0.07-ft2 break was the worst case with a peak cladding tenparature of 10927.
These results were formally transmitted to NRC by letter from J.H. Taylor to S.A. Varga, dated 7/18/78.
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A formal prescutation was h3ld with thn Staff on 7/18/78 in crder to present the results of the spectrum c2 help expedite a 2772
.Wt license for SMUD and to also explair and justify the si=pli-fied FCAM calculation.
SMUD was given en interin 2772 Mit 11-cense on 7/21 until a detailed FOAM calculation is perfor=2d.
Work is progressing on this item and should be ce=pleted in em:17 August.
B.
Oconee FSAR Upgrade - The Oconee FSAR Upgrade progran was com-plated on 7/11. The results of the FSAR review is contained in the neco R.C. Jones to D. Mars, dated 7/11/78.
C.
Consuner's Jet Impingement Program - ECCS successfully resolved the excessive' feedvater header loading concern. As per C.E. Ma-haney this saved B&W from a loss of $500K as well as a customer credib'14ty gap.
Recently Bechtel detezzined that the loads on one set _of_p'"-'
snubbers are over design. ECCS antic.'. paces that durin*g~the usx*c._'
month the Unit will be able to redis tribttee and/or reduce Ehe ~~ ~- " -- --
snubber loads such that the hardware :.c:-.f.us intact and functional.
II.
CONCERNS There is a concern by SMA and SMU that the upper plenum assenbly LOCA Iceds on B3R Unit 2 are too high.
ECCS Analysis is investigating the matter.
III.
ADMINISTRATIVE
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N.K. Savani returned from a personal leave-of-absence on 18 July.
C.W. Jones returned from medical leave this month.
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