ML20024G804

Submits Suppl 3 to 740123 Rept, Permanent Plant Changes to Accommodate Equilibrium Core Scram Reactivity Insertion Characteristics.

ML20024G804
Person / Time
Site:	Monticello
Issue date:	04/26/1974
From:	Mayer L NORTHERN STATES POWER CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9104300430
Download: ML20024G804 (3)

Text

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- NSp NORTHERN STATES POWER COMPANY M I N N E A P C L. I ti . M l N N E 9 O T A 9DADI  %

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April 26, 1974 M8 /

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$ Q' Mr. J P 0' Leary Directorate of Licensint am sana /,

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f' Of1 ice of Regulat. ion p 6 % stm j ' 4, q U S Atomic Energy Commission -

k'a rh i ng t o n , DC 20545 (h b u. s la. v'irary:

!ONTICELID NUCLLAP. GENLRATING PIANT Docket No. 50-263 License No. DPR-22 Supplement No. 3 to January 23, 1974 Report Entitled, "l e rmin . "' Plr

• C x ;( 1 t e Ac commd a t t Equilibrium Corr M rre h nc t i ei t v Insertinn Charecteristier" In a March L., 1974 Ittter from Mr. D J Skovhol' we were requested to furnish calculations supporting assuttption E.2.c (Pape , of the above referenced report. Specifically, this requires (1) justification for uncoupling the relief valve discharge line stress analvsis from the main steam line and (2) analysis of simultaneous opening of two relief valves on the same main steem line.

The dynamic analysis considers the relief valve inlet, the relief valve, and the relief valve discharge line to be anchored between the main steam line and the torus vent tube penetration. The vent tube is locally reinforced ard is truly an er lor. Justification for assuming the main steam line as an anchor is threefold. The mass ratio of the main steam line to the relief valve discharge line (1:0.216 per linear unit length) and the short duration of the applied transient at the discharge piping (less than 500 milliseconds),

indicate that the displacement of the main steam line is insignificant with respect to other 1 cads epplied to the main rteam line as shown below and can therefore, be ignored. The maximum calculated forcer and moments at the main stecm line connection are ordcrs of rnarnitude smaller than other forces and moments from other loading conditions seen at this location. The relief valve inlet is smaller in size than either the main steam line or the relief valve discharge line and therefore requires careful analyses. Assuming the main

' steam line as an anchor will maximize the forces and moments on the inlet, making the calculation c o nc e rva t i n ; ; f the main steam line were allowed to rotate er tr m late - 3 th< trent ! < nt forcer, the stresses would be reduced.

9104300430 740426 PDR ADOCK 05000263 P PDR

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NORTHERN OTATEO POWER COMPANY Mr. J r O' Leary

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Page 2 The ef f ects of sintaltaneous discharge of the two relief valves on the most limiting line were analyzed statically by applying simultaneously, at the main steam line connections, the maximum loada determined from the two relief valve blowdown analysis. The maximum calculated forces and moments on the main steam line anchor are insignificant as shown below. For comparison, and scismic the plant operating conditions which include the thermal, weight, loads are included. These figures demonstrate compliance to the ANSI B31.1b 1973 Code Requirements.

Fr Mx My MZ location loadint lx FY Relief Valve -1,094 2. 8/4 P, lowdown 36 874 - 199 898 lleactor

.,7)e Plant Oper-47,539 l stine load 999 11,122 _3.353 61,105 1 335 I 'elie f Valve-Drywell Blowdown -226 -1,408 390 28,342 2a974 -1.839 Flued Plant Head 3PCf"ti"B 4.446 pgo,444 77,775 01 gas  !

nn' 5.14' 71. r.7 7 F= lb. M=ft. - Ibr.

Yourt very truly, t

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L 0 Mayer, PE '

Director of Euclear Support Services LO./lb M

cc: J G r.eppler G Chernoff Minnesota Pollution Control Agency Attn. E A Pryzina

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