ML20024G187

Discusses Removal of drywell-wetwell Differental Pressure Controls.Viewgraphs Used During Presentation During 770823

ML20024G187
Person / Time
Site:	Monticello
Issue date:	08/29/1977
From:	Mayer L NORTHERN STATES POWER CO.
To:	Stello V Office of Nuclear Reactor Regulation
References
NUDOCS 9102070660
Download: ML20024G187 (28)

Text

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wm NORTHKRH STATES POWER COMPANY MIN N S A POLie. M4 N N E S OTA 38400 August 29, 1977 O

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Mr Victor Stello, Director H %

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Division of Operating Reactors

'c/o Distribution Services Branch, DDC, ADH tr 4h 1; 3

U S Nuclear Regulatory Connission f

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Washington, DC 20555 g

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Dear Mr Stello:

MONTICELLO NUCLEAR GENERATING PIANT Docket No. 263 License No. DPR-22 Removal of Drywell-Wetvell Differential Pressure Controls On August 23, 1977 representatives of Northern States Power Company met with

n. embers of your staff to review progress of the Mark I Containment modifications at Monticello. We also addressed the NRC criteria for remora'l of differential ~ pressure i

controls which were transmitted to us with a letter from Mr D K Davis, dated May 19, i

1977. Enclosure (1) contains copies of the view graphs used during our presenta-tion during the August 23 meeting.

1 During this meeting we were informed by your staff that to remove differential pressure controls we must either demonstrate compliance with the criteria in the May 19 letter or the loads must be less than code allowable. It is shown in Tables 2.2-2 atxi Tables 2.2-3 of enclosure (2) that at the maxinum e.orus water level the strength ratios of all critical structural elements are either less than 0.5 or code allowable. The loads used to derive these ratios were determined in accordance with the information contained in the May 19 letter.

t j

Since the Staff criteria for removal of differentisi pressure controls are satis-fied at Monticello we hereby withdraw our License Amendment Request dated April 15, 1977 and our License Amendment Request dated November 5,1976, which was superseded by the April 15 submittal, and the cccmitments contained in our March 1,1976 letter I

to you on this subject. The amendment requests contained revisions to the Technical Specifications covering the drywell to suppression chamber differential pressure, containment water volume and dif ferential pressure instrumentation.

i For your information, we have provided the strength ratios of the critical 4

structural elements at the maxinum torus water level without delta-P and without the 1.33 multiplier. his infor-eba is contained in Tables 2.2-la, 2.2-2a and i

2.2-3a of enclosure (2), and demonstrates that all elements meet code allowable or are very close to it.

R e 1.33 multiplier was dropped for this case on the y7 /he::7.2. y 9102070660 770029 t

I PDR ADOCK 05000263 p

PDR l

NOR RN OTATEO POWER COi ANY e

Mr Victor Stello Page 2 August 29, 1977 basis of the information presented to your staff by General Electric on August 24, 1977, which demonstrated that the pool swell loads from the one quarter scale test progree are approximately 607 of the values reported in the Short Term Program Report.

Yours very truly, L 0 Maye, PE Manager of Nuclear Support Services IDM/LLT/ak l

cct J G Keppler G Charnoff MPCA - Attn: J W Ferman 4

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Re gulatory i Ogpf UNITED STATES NUCLEAR REGUIATORY COMMISSION NORTilERN STATES POWER C(NPANY MONTICELLO NUCLEAR GENERATING PIANT

{

l Docket No. 50-263 License No. DPR-22 LETTER DATED AUGUST 29, 1977 RESPONDING TO NRC REQUESTS FOR INFORMATION ON CONTAINMENT DESIGN l

Northern States Power Company, a Minnesota corporation, by this letter dated August 29, 1977 hereby suleits information in response to NRC requests for information concerning the Mark I containment, I

This request contains no restricted or other defense information.

NORIllERN STATES POWER COMPANY 4

i i

By. 6 Y, bl

1. /. J WacEter' Vice Prestwent, Power Production

& System Operation On this 29th day of August. 1977 before ma a notary public in and for said County, personally appeared L J Wachter, Vice President, Power Production and System Operation, and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his j

knowledge, information and belief, the statements node in it are true and that it is not interposed for delay.

l W s A u w s _.

=_/ 1au)

/

lI_____

DENISE E.'HALVORSON '

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MOTARY MJDUC e M8NNEs0TA

{

HENNEPIN COUNTY l

l My Cr " "-. Empiree Oct 10.1961,

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mu au TORUS SUPPORT COLUMN C0f1NECT10N e

PURPOSE OF REINFORCEMENT i

COMPLETE SUPPORT REINFORCEMENT CHAIN' i

t PIN CONNECTION AT BASE OF COLUMN AND COLUMNS HAVE BEEN PREVIOUSLY REINFORCED l

o LOAD BASIS FOR STRENGTH RATI0 CALCS.

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PLANT UNIQUE ANALYSIS REPORT l

(SHORT TERM PROGRAM) i f

P0OL SWELL + DEAD LOAD + SEISMIC WAP IS COL.

654.4K

=

847.2K OS COL.

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Figure 2,2-2 REINFORCED SUPPORT _COLU'!N TO SIIELL CONNECTION i

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TORUS SUPPORT CAPACITIES i

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CODE STRENG.TR COMPONENT

' ALLOWABLE ULTIMATE RA',10 i

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SHEL'L 4

940K 2820K 0.30 CONNECTION COLUMN 1189K 3288K 0.26

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'i PIN-i 993K 2960K O.29 CONNECTION I

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SUMMARY

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INCREASED SIZE OF EXISTING WELDS TO FULLY

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6-DEVELOP STRENGTH OF 1 1/2" WEB PLATE Q

Tf:

s ADDED 1" REINFORCING PLATES PARALLEL TO EXISTING WEB I

e PERFORMED FINITE ELEMENT ANALYSIS OF REINFORCED CONNECTION i.

l e

REPLACED APPR0XIMATE MANUAL CALCULATION OF i

CONNECTION STRENGTH WITH ACCURATE COMPUTER ANALYSIS s

INCREASED CODE ALLOWABLE STRENGTH OF CONNECTION TO BE NEAR THAT OF COLUMN AND PIN I

CONNECTION AT BASE OF COLUMN 4

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VENT HEADER SUPPORT COLUMN CONNECTION

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PURPOSE c. ;..

f INCREASE CONNECTION CAPACITY TO BE c

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NEAR THAT OF COLUMN IN TENSION i

CONNECTION CAPACITY 74 KIPS I

PIPE COL, CAPACITY 151 KIPS I

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LOAD BASIS j

PLANT UNIQUE ANALYSIS REPORT j

(SHORT TERM PROGRAM) i

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P0OL SWELL IMPACTING VENT HEADER i

MAX. NET TENSION = 131 KIPS

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VENT llEADER 4

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Figure 3.3-1 VENT HEADER SUPPORTS c].

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VENT llEADER COLUMN MODIFICATION i

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CODE ALLOWABLE CAPACITY ELEf1ENT STRESS

UNREINF, REINF,

}:}f, COLLAR SHEAR 88" 220K

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UPPER PIN SHEAR 143K 911k BEARING 74 141K k

e BENDING

'140k 926k i

PIN PLATE TENSION 134K 134k f

SHEAR 132k 132K WELD SHEAR 223K 223K i

i PIPE COL.

TENSION 151K 151k 1

4 4

LOWER PIN SHEAR 143k 548k 1

BEARING 111K 141k BENDING 117K 449k i

RIllG WEB SHEAR 138k 138k SYSTEM UNREINFORCED CAPACITY = 74K REINFORCED CAPACITY

= 132k 1,

0 ENCIDSURE 1 ULTIMATE CAPACITY i

ELEMENT STRESS UNREINF.

REINF.

j; k

COLLAR SHEAR

, 276 690K UPPER PIN SHEAR 606k 1885K BEARING 308k 462K BENDING 373K 2469K PIN PLATE TENSION 548K 548K SHEAR 413K 413K WELD SHEAR 589K 589K PIPE COL.

TENSION 462k 462K LOWER PIN SHEAR 606K 1134k I

BEARING 462K 462K BENDING 313K 11g7K RING WEB SHEAR 431K 431K j

SYSTEM L

UNREINFORCED CAPACITY - 276k REINFORCED CAPACITY

= 413K i

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t VENT HEADER SlJPPORT CAPACITIES

-I %

,k CODE STRENGTH I

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./o sz ALLOWABLE ULTIMATE RATIO 3

i PRIOR TO 74K 276K 0'47 REINFORCEMENT AFTER 13K-0.32 REINFORCEMENT i

4 STP LOAD = 131 KIPS i

e 4

~c 4

l.-

_ - = - -

o 9

-uan >

DRYWFlllWETWFIl DIFFERENTIAL PRESSURE REMOVAL i

1

P e

NRC CRITERIA 4

DETERMINE LOADS W/0 A P USING STP REPORT ADDENDUM 2 3

INCREASE LOADS W/0 AP BY 33%

LIMITING STRENGTH RATIO = 0.50 4

(

i 4

1 l _ -. - _.. _ -

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tactosu e i TABLE 2.1-1 TORUS SUPPORT COLUMN MAXDtUh! C0FtPRESSIVE 1,0 ADS AT MINDIUM WATER LEVEL l

1 2

3 4

5 6

7 s

1 POOLSWELL AllJUSTED STEEL 6 VERTICAL HORIZOWAL TOTAL COLRN 1mD (AP)

POOLSWELL WATER IDAD SEI911C SEISIIC IDAD tmD ID4D IDAD 0

(KIPS) (1) (KIPS) (2) (KIPS) (1)

(KIPS) (1)

(KIPS) (1)

(KIPS) (3)

INSIDE 493.3 795.3 147.6 8.8 4.7 956.4 4

j OUTSIDE 655.9 1057.4 172.6 10.4 8.3 1248,'

I NOTES:

(1)

NSP-01-140, Table 6.1.1-1, minimum submergence, Reference 2 (2)

" Acceptance Criteria for the Removal or Reduction of Drywell-Wetwell Differential Pressure Controls" 493.3 x (

) x (1. 3 3) =

795.3 655.9 x (

) x (1,33) r LOST.4 (3)

Summation of columns 3, 4, 5, and 6 l

I 1

c)

O

==1 TABLE 2.1-2 DOWNWARD LOADS ULTIMATE CAPACITIES AND STRENGTH RATIOS AT MINIMUM WATER LEVEL h

1 2

3 4

STP ULTIMATE COMPONENT LOAD ULTIMATE STRENGTH CAPACITY RATIO (KIPS)

(1),

(KIPS)

SHELL CONNECTION 2820

.34 I

(2) m S

COLUMN 956.4 3140

.30 g

(3) 1 PIN CONNECTION 2960

.32 (3)

SHELL CONNECTION 2820

.44 l

(2)

E Di.

COLUMN 1248.7 3288

.38 E'

(3) 8 PIN CONNECTION 2960

.42 (3) 1 NOTES:

(1)

Ad usted no 4P load.for minimum submergence from Table 2.1-1 (2)

Capacities per NSP-01-176, Reference 4 (3)

Capacities per NSP-01-140, Reference 2 1 - - - -.

'9 #

~

TABLE 2.1-3 STRESS INTENSITIES AND STRENGTH RATIOS i

FOR RING AND SHELL AT MINIMUM WATER LEVEL i

1 2

3 4

5 6

7

-8 9

MAXDIUM STRESS ADJUSTED MAXIMUM STP ULTDIATE UL THATE INTENSITY STRESS INTENSITY CAPACITY STRENGT!i RATIO COMPONENT (KSI)

(1)

(KSI)

(2)

(KSI)

P Pg+Q P

Pg+Q P

Pt+Q P

Pg+Q g

g g

g RING 16.6 16.6 23.9 23.9 76.0 76.0

.31

.31 i

SiiELL 21.6 24.0 32.2 36.2 76.0 76.0,

.42

.48 h

NOTES:

(1)

Stress from nip-01-140 for minimum submergence with op (1.0 psi), Reference 2.

(2)

Pool Swell loads without op increased by 1/3 and added to dead load plus seismic g

o (3)

Pg = Local primary membrane stresses k

g (4)

Q = Secondary stresses

~

.. =.

O O

t"ctosu = 1 Table 2.2-1 TORtlS SUPPORT COLUhlN MAXIblUbi COh1PRESSIVE LOADS a

AT MAXIMUM WATER LEVEL I

1 2

3 4

5 6

7 i

POOLSWELL AIUUSTED STT.EL 6 VERTICAL HORIZONTAL TOTAL COLLMN URD (AP)

POOLSWELL WATER IDAD SEI911C SEISIIC UMD MAD IBAD UMD (KIPS) (1) (KIPS) (2) (KIPS) (3)

(K:PS) (3)

(KIPS) (3)

(KIPS) (4) 0 INSIDE 530.9 855.9 164.0 9.8 5.2 1034.9 OUTSIDE 705.9 1138.0 191.8 11.6 9.2 1350.6 NOTES:

(1)

NSP-01-168, Table 2, Maximum submergence, Reference 5 (2)

" Acceptance Criteria for the Removal or Reduction of Drywell-Wetwell Differential Pressure Controls" 530.9 x (

I ) x (1.33) = 855,9

.825 705.9 x (

1 )iX (1.33) = 1138.0

.825 (3)

Table 2, NSP-01-168 (4)

Summation of Columns 3, 4, 5, and 6

0 O

mom 1 TABLE'2.2-2 DOWNWARD LOADS ULTIMATE CAPACITIES AND STRENGTH RATIOS

>f1 i

AT RAXURBI WATER LEVEL j

4 1

2 3

(

STP ULT DtATE COMPONENT L0aD ULTDIATE STRENGTH 1

CAPACITY RATIO

(, KIPS)

(1)_

(KIPS) l SHELL COi1NECTION l

2820

.37 (2) su COLUMN 1034.9 3140

,. 33 g

l (3)

I 4

PIN CONN 1!CTION 2960

,.35 (3) l SHELL CONNECTION 2820

.48 (2)

G COLUMN 1350.6 3288

.41 g

(3)

O PIN CONNECTION 2960

.46 ll (3)

NOTES:

(1)

Adjusted no AP load for naximum submergence from Table 2.2-1 ll (2)

Capacities per NSP-01-176, Reference 4 (3)

Capacities. per NSP-01-140, Reference 2 I

j p

o

__1

(

STRUCTURAL CAPACITY

SUMMARY

]

e TORUS SUPPORT COLUMN CONNECTIONS HAVE BEEN REINFORCED T

e VENT HEADER SUPPORT COLUMN CONNECTION REINFORCEMENT IS

(

PLANNED l

a NRC CRITERIA FOR AP REMOVAL DURING SRV DISCHARGE TEST IS SATISFIED i

l i

(

f I

s j._

TABLE 2.2-3

~

STRESS. INTENSITIES AND STRENGTH RATIOS i

l j

FOR RING AND SilELL AT MAXIMUM WATER LEVEL f

1 2

3 4

5 6

7 8'

9 MAXDfUM STRESS ADJUSTED MAXIM'IM STP ULTIMATE ULTIMATE INTENSITY STRESS INTENSITY CAP' CITY STRENGTH RATIO COMPONENT (KSI)

(1)

(KSI)

(2)

(KSI)

P Pg+Q P

?, + Q P

P

+Q P

P

+Q g

g g

g g

g g

RING 16.6 16.6 25.4 25.A 76.0 76.0

.33

.33 p

I,_

SHELL 21.6 24.0 34.4 38.7 76.0 76.0 45 COD NOTES:

(1)

Stress from NSP-01-140 for mi'nimum submergence with ap (1.0 psi), Reference 2.

(2)

Pool swell lon's with op increased by 1/3 and added to dead load g

plus seismic 25 (3)

P

= Local primary membrane stresses g

N (4)

Q = Secondary stresses L

.O Adb e s

-yr

TABLE 2.2-3A e

STRESS INTENSITIES AND STRENGTil RATIOS FOR RING AND SIIELL AT MAXIMUM WATER LEVEL i

_1 2

3 4

5 6

7 8

9 MAXIMUM STRESS COLE ALLOWABLE STP ULTIMATE STRENGTH INTENSITY STRESS INTENSITY CAPACITY RATIO WITIIOUT AP (ksi)

(2)

(ksi)

ULTIMATE \\ CODE COMPONENT (ksi)

(1)

P P +Q P

P +Q P

P +Q P

P +Q g

L g

L g

g g

1.06

.35 RING 20.5 20.5 19.3 57.8 76.0 76.0 m

.27 KEETS z

CODE 13 6

.93

.52 8

4 E

SIIELL 26.9 30.1 28.95 57.8 76.0 76.0 MEETS MEETS w

CODE CODE NOTES:

(1)

Pool swell loads without ap added to dead load plus seismic (2)

NSP-01-140 l

(3)

P

= Local primary membrane stresses L

(4)

Q

= Secondary stresses 6

l E5, Sa-l 8e :

~

-o

~

NSP-11-019 ENCIDSURE 2 Revision 1 TABLE 2.2-2 DOWNWARD LOADS ULTIMATE CAPACITIES AND STRENGTH RATIOS.

AT MAXIMUM WATER LEVEL s

%[

2 dica 1

2 3

4 5

6 COMPONENT LOAD CODE ULTIMATE CODE ULTIMATE ALLOWABLE CAPACITY ALLOWABLE CAPACITY LOAD RATIO RATIO (KIPS)

(1)

(KIPS)

(KIPS) f CTION 940 2820 1.10

.37 (2)

(2) m 8

}

COLUMN 1034.9 1117 3121

.93 (3)

(3) 993 I*

C NECTION

[3)

(3) 940 2820 1.44

.48 CTION 5

COLUMN 1350.6 1166 3172 1.16

.43 h

(3)

(3) 993 2960 1.36

.46 NECTION NOTES:

(1)

Adjusted no AP load for maximum submergence from Table 2.2-1 (2)

Capacities per NSP-01-176, Reference 4 (3)

Capacities per NPS-01-140, Reference 2

_a TABLE 2.2-3 STRESS INTENSITIES AND STRENGTH RATIOS

?

s FOR RING AND SHELL AT MAXIMUM WATER LEVEL b

1 2

3 4

5 6

7 8

9 ADJUSTED MAXI 5WM CODE ALLOWABLE STP ULTIMATE STRENGTH STRESS INTENSITY STRESS INTENSITY CAPACITY RATIO COMPONENT (ksi)

(1)

(ksi)

(2)

(ksi)

ULTIMATE \\ CODE P

Pg+Q P

PL*9 E

EL+Q P

P

+Q g

g L

L g

1.32

.44 l

RING 25.4 25.4 19.3 57.8 76.0 76.0 g

.33 CODE y

h 1.19

.67 SHELL 34.4 38.7 28.95 57.8 76.0 76.0 ygg3

~ 45 CODE NOTES:

(1)

Pool swell loads without AP increased by 1/3 and added to dead load plus seismic (2)

NSP-01-140 (3)

P

= Local primary membrane stresses

,7 g

om (4)

Q = Secondary stresses 3.7 E ~~

8a

~

1 b

3 ENCIDSURE 2 e

NSP-11-019 TABLE 2.2-1A Revision 1 TORUS. SUPPORT COLUMN MAXIMUM COMPRESSIVE LOADS

~

AT MAXIMUM WATER LEVEL q.

.y 1

2 3

4 5

6 7

i

.h P00LSWELL P00LSWELL STEEL 6 VERTICAL HORIZ0l(TAL v$'.

L

~$

IDAD AP LOAD WATER IDAD SEISMIC SEISMIC

.l C013N WI'lilotri AP IDAD In'd)

(kips) (1)

(kips)(2)

(kips)'(3)

(kips)(3)

(kips)(3) e ' '.r i

INSIDE 530.9 643.5 164,0 9.8 5.2 822.7 I

j.

OUTSIDE 705.9 855.6 191.8 11.6 9.2 1068.2 NCrrES:

i I

(1)

NSP-01-168, Table 2, Maximum submergence, Reference 5

1 (2)

Determination of Poolswell Load without Drywell-Wetwell differential pressure I

! i-530.9 x (

) = 643.5 j

705.9 x (

) = 855.6 (3)

Table 2, NSP-01-168 (4)

Summation of Columns 3, 4, 5, and 6 L

a I

i t

{'

'9'

ENCIDSURE 2 NSP-11-019 Revision 1 j

v TABLE 2.2-2A DOWNWARD LOADS U$TIMATE CAPACITIES AND STRENGTH RATIOS

, c.

AT MAXIMUM WATER LEVEL 4

r 1

2 3

4 5

6 COMPONENT LOAD CODE ULTIMATE CODE ULTIMATl!

(KIPS)

(1)

ALLOWABLE CAPACITY ALLOWABLE CAPACITY LOAD (KIPS)

RATIO RATIO i

(KIPS) 940 CI ECTION 2)

(2)

C m

O COLUMN 822.5 1120 3131

.73 MEETS (3)

(3)

CODE PIN 993 2960

.83 MEETS i

CONNECTION (3)

(3)

CODE l

940 2820 1.14

.38 0 ?ECTION E

COLUMN 1068.2 1178 3236

.91 MEETS (3)

(3)

CODE O

a PIN 993 2960 1.08

.36 CONNECTION (3)

(3)

NOTES:

(1)

Poolswell Load without AP for maximum submergence from Table 2.2-1A (2)

Capacities per NSP-01-176, Reference 4 g.

(3)

Capacities per NSP-01-140, Reference 2

.li l!l L

i N

e m niNuusan i 95

_,.Q~C - 2Q NRC DISTRIBUTION rom PART 50 DOCKET MATERI AL

^#

FROM:

m/rs op oocuutNT TO, Northern States Power Company 8/29/77 Mr. Victor Stello Minneapolis, Minnesota o,7,,, c,y,,

L. O. Mayer 8/31/77 LAarren GiMoTonizso P a o*

iseurromu Nuusen or copias mectiveo B'ontolNAL

@bNCLASalPlso OCO'Y 3 $ / /,A) E h ossemierson sNcLosums i

Consists of response to NRC request for l

inf ormation concerning the Mark I Containment.....notorized 8/29/77.......

)

1 4

$p rn' jw.u.U ni 4.. -

i (2-P)

(1/4")

00K0T elide PLANT NAME:

Monticello RJL 8/31/77 FOR ACTION /INFORMATION ENVIFIR4 MENTAL MAy m ASSIGNED AD:

V. MOORE (LTR)

I A99 TONED AD,

_b A t/ IS BRANCH CHIEFt RRAN N GTEF, (7)

PROJECT MANAGERr' FROJECT MANAGER:

LICENSING ASSISTANT 1

LICENSING ASSISTANT:

il h

B. MARLESS INTERNAL DISTRIBUTION 1

Ar-nn 'TTve 7 SYSTFMS SAFE'IY FIAVT SYSTEMS SITE SAFETt &

l

/

NPc Pnn HEINt2d.AN

'/ TEDESCO ENVIRON ANALYSIS

/T A. e (%)

SN'voEDER IBENAROYA DENION & MULLER

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