ML20049A737

Confirms 810917 Telcon Re Containment Design Pressure.Util Reluctantly Commits to Design Containment Vessel to Meet ASME Svc Level a Stress Limits for Design Interval Pressure of 25 Psig at Ambient Temp

ML20049A737
Person / Time
Site:	Atlantic Nuclear Power Plant
Issue date:	09/17/1981
From:	Haga P OFFSHORE POWER SYSTEMS (SUBS. OF WESTINGHOUSE ELECTRI
To:	Adensam E Office of Nuclear Reactor Regulation
References
FNP-PST-078, FNP-PST-78, NUDOCS 8110020190
Download: ML20049A737 (2)

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- FNP-PST-078 Offshore Power Systemt . w to u m i wn s 1 uo m a 700

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September 17, 1981 ,

I g li I j Ms. Elinor Adensam, Chief OCT1 1984 u9 Licensing Braach No. 4 U.S. Nuclear Regulatory Commission ,\, , , u.s.**""unw * % j~

7920 Norfolk Avenue Bethesda, MD 20852 W[ p)g -

he: Docket STN 50-437; Containment Design Pressure P. B. Haga o,,,,,

Dear Ms. Adensam:

Power Syste ns Technolagy Thi- letter confirms my telephone discussion with Mr. . Denton on September 17, 1981. Although reluctant to do so, Offshore Power Systems is willing to commit to the' following additional requirement which has resulted from discussions between the NRC Staff and the Commissioners.

The Floating Nuclear Plant (FNP) containment vessel will be designed to meet ASME Service Level A stress limits for a design internal pressure of 25 psig at ambient temperature, including the effects of dead load. This pressure load will not be included in other load combinations such as those including the operating basis earthquake.

l l Based on the c!-anges required to meet the above commit-aent together with those already incorporated to satisfy

! the commitment made in the Plant Design Report Appendix C l (pace C-140) to meet a minimum internal pressure of 45 psig at Service Level C conditions, it is expected that the containment capability at ambiesit teinperature will %

as follows:

ASME Se,vice Level C (Excluding evaluation 55 psig of instability)

Functional capability based on realistic 60 psig analyses Offshore Power Systems believes the current FNP containment l

design pressure of 15 psig is adequate and does not understand

' 0110020190 810917 0 PDR ADOCK 05000437

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4 Page Two September 17, 1981 the basis for imposing an additional requirement on the FNP beyond that required of other near-term CP/ML applicants. The BWR Mark III plants included in the near-term CP/ML group have a containment design pressure similar or identical to the current FNP design pressure of 15 psig. We believe it is unnecessary and unfair to single out the FNP application for the imposition of a more stringent containment design pressure requirement.

Sin ely, h JL.

. P. B. Haga

/lel CC: V. W. Campbell A. R. Collier I

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