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August 13, 19 70 g$ :.y y p.,,.s.
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C. F. 81ess, Chairman 1
Brunswick Subcommittee
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S. R. Bush, Vice Chairmian, ACES i
CATEGORY B REPORTS - SRUNSWICK - ML REQtEST FOR ADD'L IMPORMATIOM; CF&L REPORT CONTAINING ADD'L IMO ON PRES 8URE SUFFRESSION CONCEPT; l
ML LETTER IDENTIFYING ENVIRONMENTAL INFO WHICH SHOULD BE SUBMITTED WHEN FSAR IS FILED The listed reports and my samemary of the sentents are attached for your review.
DEL is continuing its review of tha proposed reduction in containment design pressure from 62 psig to 53 poig. In Attachment #2, CF&L ob-I serves that there is considerable margin between the suposted pressure l
and the pressure which the vessel can stand at the time of peak pressure.
No ACKS action is recommended until DEL has finished its review.
Attachment #2 should be retained La your permanent set *of Brunswick documents.
Orisinal Signed by J. E. Hard J. E. Hard Santor Staff Assistant Attachesnts:
1.
DEL Ltr dtd 3/28/70 to CP&L 2.
CP6L Ltr dtd 7/30/70, w/ Report on pressure suppression concept 3.
DEL Ltr dtd 7/6/70 to CF&L 4.
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n tsunswisk ta a letter dated Mar M.1970. M M ade k
informatten sa IACA bleudeum models and test data.
6' inferunsties usutd be used in ovatusting the peepened F j?'
ducties is sentaineset design pressere from 62 pets to 53 pois.. (This e d ject was diesmesed durtag the 123rd ACRs meeting.) M is additiemal Safenenties uns provided by S E in a memort dotad. J$r 31. 1979. h saport's eseclusimas state that the proposed design sendittene of 53 pois and 3egeF give a etructure 'that is more espeble them a 62 pois free-standias steel vossal. h unia
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justification for this canelesian was the tag of liner temperature es sempered to the eesta h e posseure.
This las is of the order of minutes. At the tima of peak dryme11 preneure, the liner temperature is about 1158F.
As shoue in Figure 27 of the report, this louer-thes-design
.j temperature would pommit the asseptable pressure to se up I
to 73 peig - eseelderably above that eMah would be assept-able at 300*F. Se, the margia at the time of peak presoste is 73 pois - 53 peig = 20 psi er 381. the soport also noted that steel-timed senereta sentaimment vessels for PhK's make use of the transteet temperature tag.
It is recommended that the ACRs emotimes to follow slesely t.he developeones unsarding the Brunswick esatainment design presette.
A BEL remunst of dgly 6.1970, was for the uomal type of envireemental information. The letter asks that the re-guired informaties be filed as as amendment er as part of the FSAR.
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EXCERTT FROM P
123RD ACRS Meeting July 9-11, 1970 1
Heeting with Division of Reactor Licensing
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Meetine with the Division of Reactor Licensing 1.
_ Brunswick - DRL reported ment design pressure at 53 psi vice 62 psi, originally propos sure underestimated actual test data for a blowdow DRL' es-fore, DRL does not plan to approve this reduction unless th There-can justify use of the newer analytical techniques.
e applicant requested of the Committee.)
- No action was Dr. Siess noted that variations exist in the margin betwee for additional information regarding a consistent basis n the e Staff lishing such margins.
estab-DRS has agreed to provide this information.
The Committee decided to support the Staff position regardi design pressure for the Brunswick containment.
ng the (Dr. Morris was informed of this decision.)
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