ML20135J099

Nonproprietary Chapter 7 of RESAR-SP/90 Westinghouse Advanced Pwr,Pda Module 16, Assembly of Risk

ML20135J099
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Site:	05000601
Issue date:	09/30/1985
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
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ML19273A546	List: ML20135J094 ML20135J096 ML20135J097 ML20135J098 ML20135J099 NRC-85-3064, Forwards Proprietary & Nonproprietary Vols 3 & 4 to RESAR-SP/90 Westinghouse Advanced Pwr,Pda Module 16, Probabilistic Safety Study. Proprietary Version Withheld (Ref 10CFR2.790)
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i l 7.0 ASSEMBLY OF PLANT RISK j In this section, the results of Sections 1.0 through 6.0 have been assembled j in order to calculate the plant risk in six consequence categories. The results are expressed in terms of risk curves. Also included in this section l

j are the dominant contributors to selected consequences categories. The l dominant contributors are displayed as histograms. All of the results are l reported as point estimate values . which represent the mean values of the l underlying distributions.

• i The risk assembly process is briefly described in Section 7.1. The plant l

consequence analysis has been implemented for both the Salem and Byron plant sites, as done in Section -6.0. The plant risk assembly process is done for both of these sites and the results are given in Section 7.2 for the Salem '

site; and 7.3 for the Byron site. The conclusions which are based on the results, are given in Section 7.4.

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1 4

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O W APWR-PSS

7. 0-1 September,1985 9112Q:10/090985 8709250227 850913

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O 7.1 PLANT RISK ASSEMBLY METHODOLOGY In this section, the plant risk assembly methodology is briefly described.

The initiating event analysis is carried out in Section 1.0. In this section the initiating event frequencies are calculated. The results are repeated in Table 7.1-1. The plant analysis is carried out in Sections 2.0 through 4.0.

l In these sections the plant coremelt frequency and the coremelt state frequencies for the 27 coremelt states are calculated. The plant analysis is sumarized in a matrix format (plant-matrix). The elements of this matrix represent the conditional probability of reaching a particular plant coremelt state, given the occurrence of an initiating event. The plant matrix is displayed in Table 7.1-2. When the 1 by 10 initiating event f requen:y vector is multiplied by the 10 by 27 plant-matrix, the 1 by 27 plant coremelt frequency vector is obtained. The resultant nutrix is given in Table 7.1-3.

The coremelt frequency listed by initiating events, is shown in Table 7.1-4.

O The core and containment analysis leading to the definition of fission product release categories and the calculation of the conditional probabilities of reaching a release category given the occurrence of a plant coremelt state is carried out in Section 5.0. The results of this analysis is sumarized in a containment matrix. Then release categories are defined. Thus, the containment matrix is a 27 by 10 matrix, as given by Table 7.1-5. The product-of the 27 by 1 plant coremelt f requency vector and the containment matrix results in the 1 by 10 release category f requency vector, given by Table 7.1-6. Table 7.12-6 also provides brief descriptions of the release O categories.

Six consequences categories are studied for the ){ APWR plant at each of the two sites, SALEM and BYRON. These categories are as follows:

O 1. Early Fatalities

2. Population with Bone Marrow Dose > 200 Rem

3. Population with Whole Body Dose > 25 Rem .

4. Population with Thyroid Dose > 300 Rem W APWR-PSS 7 .1 -1 September,1985 91120:10/090985

O

5. Latent Cancer Fatalities (excluding thyroid cancer)

6. Population Whole Body Man-Rem g For each site and consequence category, a site matrix is calculated in Section 6.0. Each element of a site matrix represents the probability of exceeding a consequence level, given the occurrence of a release category. When a 10 by N site matrix is multiplied by a 1 by 10 release category frequency vector, it gives the 1 by N risk vector, where 'N is the number of consequence levels for a category. The risk vector can then be plotted to generate the risk curve.

The site matrices and the risk curves for each site are given in Sections 7.2 R and 7.3.

O O

O W APWR-PSS 7.1-2 September, 1985 O

91120:10/090985

l l

'O TABLE 7.1-1 INITIATING EVENT DEFINITIONS AND MEAN FREQUENCICS O

O "o 1

O O-O I

O W APWR-PSS SEPTEMBER, 1985 7.1-3

e TABLE 7 1-2 PLANT MATRIX O

(a.c)

O O

O O

W APWR-PSS 7,1,4 SEPTEMBER, 1985 e

a O

TABLE 7.1-3 COREMELT FREQUENCY BY COREMELT STATES O .

(a c)

O O -

O O

W APWR-PSS SEPTEMBER, 1985 7.1-5

O TABLE 7.1-4 COREMELT FREQUENCY BY INITIATING EVENTS O l (a,

O O

O W APWR-PSS

, 7.1-6 SEPTEMBER, 1985

$9A i

9 IMAGE EVALUATION /f 'I$g g )77 y ( / TEST TARGET (MT-3) ((4%*g[fb /',

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$18 i.25 '

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4 150mm >

4 6" ->

Al*%

v.wy, y 4-

/++o!b#/s/

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i O

TABLE 7.1-5 CONTAINMENT MATRIX O

(a.c) l O

O O

O W APWR-PSS 7,1 7 SEPTEM5ER, 1985

O CONTAINME ATkIX (CONT.)

(a,c O

O O

W

_,APWR-PSS 7.1 8 SEPTEMBER, 1985

O TABLE 7.1-6 RELEASE CATEGORY DEFINITIONS AND FREQUENCIES O

O O

O O .

O yAPWR-PSS SEPTEMBER, 1985 7.1-9

7.2 PLANT RISK In this section, the site nutrices and the plant risk curves for the SALEM site are given. .Also, the plant risk is analyzed to identify the dominant risk contributors.

7.2.1 CALCULATION OF PLANT RISK The six site matrices for the SALEM site are given in Tables 7.2.1-1 threugh O 7.2.1-6. The product of the release category vector (Table 7.1-5) and each site natrix gives the associated risk vector. The six risk vectors are given by Tables 7.2.1-7 through 7.2.1-12. These risk vectors are plotted as risk curves which are given by Figures 7.2.1-1 through 7.2.1-6.

7.2.2 ANALYSIS OF DOMINANT CONTRIBUTORS To analyze the dominant contributors to plant risk, two risk neasures are selected:

O 1) Damage Level 1 of Early Fatalities. This corresponds to the frequency of occurrence of 1 or more early fatalities resulting from operation of the plant for 1 year (when one of the postulated accident sequences occurs).

ii) Damage Level 1 of Latent Cancer Fatalities. This corresponds to the.

• frequency of occurrence of 1 or more latent cancer fatalities resulting from operation of the plant for 1 year (when one of the postulated accident sequences occurs).

For each risk measure, the dominant release categories, plant coremelt states and the initiating events are identified and are displayed in Tables 7.2.2-1 and 7.2.2-2. The contents of these tables are also displayed as histograms in Figures 7.2.2-1 through 7.2.2-6.

W APWR-PSS 7.2-1 September, 1985 9112Q:10/090985

g, ,

• WD SALEM SITE MATRIX EARLY FATALITIES (CONDITIONAL ,ROBABILITY DISTRIBUTION)

O (8.C) l O

O 9

O O

s a~a-ess 7.2 2 sE,m m . 1,s, e

I

~

l @ TABLE 7.2.1-2 SALEM SITE MATP,1X POPULATION WITH BONE MARROW DOSE GREATER THAN 200 REM g

(CONDITIONAL PROBABILITY DISTRIBUTION) l l

(a c) i 6

I I

i G  :

i p

i I

SEPTEMBER, 1985

. W APWR-PSS .7.2-3

W

. - . . . . . ~

SALEM SITE MATRIX e

POPULATION WITH WHOLE BODY DOSE GREATER THAN 25 REM l (CONDITIONAL PROBABILITY DISTRIBUTION)

O (a.c)

O O

o l l

9

. G SEPTEMBER, 1985 yAPWR-PSS 7.2 4 l

l l

TABLE 7.2.1-40VN IINULU)

SALEM SITE MATRIX POPULATION WITH WHOLE BODY DOSE GREATER THAN 25 REM (CONDITIONAL PROBABILITY DISTRIBUTION) 9 I

(4.C)

{

i l

L l

i 1

i l

~

r i

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es yAPWR-PSS SEPTEMBER, 1985 7.2-5

m a 7.2.1.A O SALEM SITE MATRIX POPULATION WITH THYROID DOSE GREATER THAN 300 REM (CONDITIONAL PROBABILITY DISTRIBUTION)

O' (a.c)

O O

O O

W APWR-PSS SEPTEMBER, 1985 7.2-6

O I ABli /.4.1-* (LUNI ANULU)

SALEM SITE MATRIX POPULATION WITH THYROID DOSE GREATER THAN 300 REM (CONDITIONAL PROBABILITY DISTRIBUTION) i (4.C)

S

. I i

. I i

O 9 ..

i l

l .

O yAPWR-PSS $EPTEMBER, 1985 7.2-7

_ , , , n - - - - _

TABLE 7.2.1-5 SALEM SITE MATRIX LATENT CANCERS (EXCLUDING THYROID CANCERS)

(CONDITIONAL PROBABILITY DISTRIBUTION)

O (a.c)

O 1

l O

O l

i 9.

yAPWR-PSS 7.2-8 SEPTEMBER, 1985 ql \

l

I l

l L

i i

TABLE 7.2.1-6 SALEM SITE MATRIX l

POPULATION TOTAL WHOLE BODY MANREM i t

G (CONDITIONAL PROBABILITY DISTRIBUTION) l i

l (a,c) l 9  !

I l

o a

O i I

i i

i

. I l

S l l

. i O W APWR-PSS SEPTEMBER, 1985 7.2-9 l

TABLE 7.2.1-6 (CONTINUED)

SALEM SITE MATRIX l POPULATION TOTAL WHOLE BODY MANREM (CONDITIONAL PROBABILITY DISTRIBUTION)

O (8,C)

O O

O i

O l

r W "W-PSS 7 2-10 SEPTEMBER, 1985

O TABLE 7.2.1 7

' POINT ESTIMATE VECTOR FOR NUMBER OF EARLY FATALITIES S SALEM i

(a.c) i

)

I i

l t

t t

l O

1

.- l i

t l

9 '

O 2APWR-PSS 7.2-11 SEPTEMSER 1985 l

l 1

I

- - _ - - - - - , - _.-. _ _ _ a _ _ _ _ _ _

[

TAB M 7,2,1 8 POINT ESTIMATE VECTOR FOR BONE MARROW DOSE >200 REM e

SALEM

- 1 l

(a.c)

O O

O 6

9 O

3APWRpss 7.2 12 strTEMara, 1985

i l

l i

l l \

TABLE 7.2.1-9

. POINT ESTIMATE VECTOR FOR WHOLE BODY DOSE >25 REM l

l 9 SALEM (a.c) f 9  !

i i

l i

I k

O i i

. L I

l I

f r

O  !

i.

I 9 -

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TABLE 7.2.1-10 POINT ESTIMATE VECTOR FOR THYR;)~0 DOSE > 300 REM i

)

SALEM O'

(a,c)

O l

O l

O S

O W APWR-PSS 7.2-14 SEPTEMBER, 1985

O TABLE 7.2.1-11 POINT ESTIMATE VECTOR FOR LATENT CANCER FATALITIES EXCLUDING THYROID CANCER S SALEM -

.i (a c) j O  :

i l

I L

l O

N em 9 -

G > >, -,ss 2.2.,s 2 , m R. >,,,

~ ._. . _.

TABLE 7.2.1-12

POINT ESTIMATE VECTOR FOR POPULATION WHOLE BODY M N-REM i

_ SALEM (a.c)

O i

e, O

t gi e

W

_ APWR.PS$ 7.2-16 SEPTEMBER, 1985

. _-. - - . _ -_-- _ - .-. -,,--,-_-.-._-o,. - , , _ . _ , - , , _ - , - - _ , . . - . . . - , _ _ _ - _ . . - - - ~ ~ - . . - _ _ _ _ _ , , _ _ _ _ _ _ _ _ _

i  :

! l l

+

L r9 TABLE 7.2.2-1 DOMINANT CONTRIBUTORS TO A SELECTED DAMAGE LEVEL DAMAGE LEVEL 1.00E+00 0F CONSEQUENCE I CATEGORY EARLY FATALITIES j

SALEM (a.c) ,

O  !

I l

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9 l

t G i i

~

l 4 .. lr I

4 yAPWR-PSS 7.2-17 SEPTEMBER,1985 l

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TABLE 7.2.2-2 DOMINANT CONTRIBUTORS TO A SELECTED DAMAG: LEVEL DAMAGE LEVEL 1.00E+00 0F CONSEQUENCE CATEGORY LATENT CANCER FATALITIES (EKCLUDING THYROID CANCER)

SALEM (a.c)

O O

i

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O esp O

EAPWR-PSS 7.2-18 SEPTEM5ER, 1985 l

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FIGURE 7 2.1-1 POI E ESTIMATE VECTOR FOR ,

WMBER OF EARLY FATALITIES yAPWR-PS$ $EPHMBER, 1985 7.2-19 l

l l

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l O,

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(8,C)

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. O FIGURE 7 2.1-2 POINT ESTIMATE VECTOR FtR BONE MARROW DOSE >200 RD1 7.2-20 SEPTEM5ER, 1985 yAPWRPSS

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. t FIGURE 7 2.1-3 POINT ESTIMATE VECTOR FOR I WHOLE BODY DOSE >25 RDi r 1

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l l O

(a,c)

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O FIGURE 7.2.1-4 POIt.T ESTIMATE VECTOR FOR THYROID DOSE >300 REM 7.2-22 SEPTEMBER, 1985 E APWR-PSS l

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FIGUPI 7 2.1-5 POINT ESTIMATE VECTOR FOR LATDir '

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7.2-23 SEPTEMBER, 1985 W APWR-PSS i

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1 FIGURE 7 2.2-1 DOMINAE RII. EASE CATEGOR CORTRIBUTORS DAMAGE LEVEL 0.10E410F CONSEWENCE CATEGORY EARLY FATALITIES W APWR-PSS 7.2-25 SEPTEMBER, 1985

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FIGURE 7.2.2-2 DOMINANT PLAh7 STATE C0hTRIBUTORS DAMAGE LEVEL 0.10E41 0F CONSEQUENCE 1 CATEGORY EARLY FATALITIES y APWR-PSS 7.2-26 SIPTEMBER, 1985

- - - - . - . . . ,~__. __

O l i

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FIGURE 7.2.2-3 DOMINANT INITIATING EVEhT CONTRIBITTORS DAMAGE LEVEL 0.10E4 1 0F CONSEQUENCE CATELORY EARLY FATALITIES O '

W APWR-PSS 7.2 27 SEPTEMBER, 1985 4 i

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FIGURE 7 2.2-4 DOMINAhT REI. EASE CATEGORY C0hTRIBLTORS DAMAGE LEVEL 0.10E41 OF CONSEQUENCE l CATEGORY LATENT CANCER FATALITIES W APWR-PSS 7.2-28 SEPTEMBER, 1985

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4 iO FIGURE 7 2.2-5 DOMINAhT PLANT STATE CONTRIBWORS .

DAMAGE LEVE1. 0.10E 41 OF CONSEQUENCE l CATELORY LATEh7 CANCER FATALITIES W APWR-PSS 7.2-29 SEPTEMSER, 1985

[

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i l__,_ - . _, _.

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(a.c)

O O

O FIGURE 7 2.2-6 DOMINANT INITIATING EVENT C0hTRIBLECRS DAMAGE LEVEL 0.10E41 OF CONSEQUENCE CATEGORY LATENT CANCER FATALITIES W APWR-PSS 7.2-30 SEPTEMBER, 1985 O

m 7

7.3 PLANT RISK RESULTS FOR THE BYRON SITE P

In this section, the site matrices and the plant risk curves for the BYRON site are given. Also, the plant risk is analyzed to identify th dominant

]

s /' risk contributors.

7.3.1 CALCULATION OF PLANT RISK o,

A The six site matrices for the BYRON site are given in Tables 7.3.1-1 through 7.3.1-6. The product of the release category vector (Table 7.1-5) and each site matrix gives the associated risk vector. The six risk vectors are given by Tables 7.3.1-7 through 7.3.1-12. These risk vectors are plotted as risk curves which are given by Figures 7.3.1-1 through 7.3.1-6.

7.3.2 ANALYSIS OF DOMINANT CONTRIBUTORS To analyze the dominant contributors to plant risk, two risk measures are y] selected:

1) Damage Level 1 of Early Fatalities. This corresponds to the frequency of occurrcnce of I or more early fatalities resulting from operation of the plant for 1 year (when ' one of the postulated accident sequences occurs).

ii) Damage Level 1 of Latent Cancer Fatalities. This corresponds to the .,

f requency of occurrence of 1 or more latent cancer fatalities resulting Ch from operation of the plant for 1 year (when one of the postulated

'd accident sequences occurs).

For each risk measure, the dominant release categories, plant coremelt states and the initiating events are identified and are displayed in Tables 7.3.2-1 and 7.3.2-2. The contents of.these tables are also displayed as histograms in Figures 7.3.2-1 through 7.3.2-6. .

O

'w.)

W APWR-PSS 7 .3-1 September, 1985 91120:10/090985

TABLE 7.3.1-1 BYRON SITE PATRIX EARLY FATALITIES (CONDITIONAL PROBABILITY DISTRIBUTION) l l

(a.c)

O e

o O

9 O'

O y AP'dR-PSS 7.3-2 SEPTEMBER, 1985

O BYRUN SITE MAIRIX l POPULATION WITH BONE MARROW 003E GREATER THAN 200 REM (CONDITIONAb PROBABILITY DISTRIBUTION)

O '

(a.c)

O J

e C

O 4

O O. .

O v ~a-ess 7.3 2 ste-Bre. aBe

I l

)

l m m T.3.>.3 0' BYRON SITE MATRIX POPULATION WITH WHOLE BODY DOSE GREATER THAN 25 REM (CONDITIONAL PROBABILITY DISTRIBUTION)

O (a.c)

O O

9 0

O 1

l W APWR-PSS 7.3 4 SEPTEMBER, 1985 O

j O BYRON SITE ttATRIX POPULATION WITH THYROID DOSE GREATER THAN 300 REM (CONDITIONAL PROBABILITY DISTRIBUTION)

O (a c)

O 1

O O

O O yAPWR-PSS 7.3-5 SEPTEMSER, 1985

--a -- . ,um -

LATENT CANCERS (EXCLUDING THYROID CANCERS)

(CONDITIONAL PROBABILITY DISTRIBUTION)

O (a.c)

O O

l O

9 W APWR-PSS 7.3-6 SEPTEMBER, 1985

/

l

l O BYRON SITE MATRIX POPULATION TOTAL WHOLE BODY MANREM (CONDITIONAL PROBABILITY DISTRIBUTION)

(a.c)

O l

o O

O O .

O yAPWR-PSS 7.3-7 SEPTEMBER, 1935 1

I

.. l

ts1Hutt blIL vmtnu POPULATION TOTAL WHOLE BODY MANREM (CONDITIONAL PROBABILITY DISTRIBUTION) 0 (a.c)

O'

=

0 .

e i

• e 1

0

- O,

) .

- 7.3-8 SEPTEMBER, 1985

]

i l

1 l

l l TABLE 7.3.1-7 l

,0 INT ESTIMATE VECTOR FOR NUFGER OF EARLY FATALITIES O: s BYRON (a.c)

O O

=,

O O

O ep

~

O O y m a.ess ,.2., sE,1EseER. ,,es

TABLE 7.3.1-8 POINT ESTIMATE VECTOR FOR BONE MARROW DOSE > 200 REM l

BYRON (a,c)

O 1

O I

O O

W APWR-PSS

- 7.3-10 SEPTEMBER, 1985 l

iO TABLE 7.3.1-9 POINT ESTIMATE VECTOR FOR WHOLE BODY DOSE > 25 REM O BYRON (a.c)

O O

9 0

O .

O v ~ss z.2 11 s,,1 _ . ,,,,

l laett /..).i-su POINT ESTIMATE VECTOR FOR THYROID DOSE > 300 REM BYRON (a c) 0 1

1 y

9 O

W APWR-PSS

- 7.3-12 SEPTEMBER, 1985

O TABLE 7.3.1-11 POINT ESTIMATE VECTOR FOR LATENT CANCER FATALITIES EXCLUDING THR0!D CANCER O BYRON 1

(a c)

O t

O O

451>

O .

O y , m ss z. 3.m s m Er. .ms .

l

I l

TABLE 7.3.1-12 POINT ESTIMATE VECTOR FOR POPULATION WHOLE BODY MAN-REM BYRON (a.c)

O i

O O

l

~

W APWR PSS 7.3-14 SEPTEM5ER, 1985

O TABLE 7.3.2-1 DOMINANT CONTRIBUTORS TO A SELECTED DAMAGE LEVEL l DAMAGE LEVEL 1.00E+00 0F CONSEQUENCE CATEGORY EARLY FATALITIES O BYRON 1

(a.c) i 1

O r O

i O .

O W APWR-PSS 7.3-15 SEPTEMBER, 1985

TABLE 7.3.2-2 DOMINANT CCNTRIBUTORS TO A SELECTED DAMAGE LEVEL DAMAGE LEVEL 1.00E+00 0F CONSEQUENCE CATEGORY LATENT CANCER FATALITIES (EXCLUDING THYROID CANCER)

BYRON (a.c)

O O

l l

1 0

e O

g l

l

I lO i

O '

(a.c) -

O i

O O

O .

'l FIGURE 7.31-1 POIKT ESTIMATE VECTOR FOR NUMBER OF EARLY FATALITIES O y APWR-PSS 7.3-17 SEPTEMBER, 1985

l l

l l

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O O

(a.c)

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' O

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FIGURE 7 31-2 POIhT ESTIMATE VECTOR FOR BONE MARROW DOSE >200 RD4 y M R-PSS 7.3-18 SEPTEMBER, 1985

O 2 i

O (a.c)

O .

O O

FIGURE 7.3.1-3 POINT ESTIMATE VECTOR FVR WHOLE BODY DOSE >25 RDi W APWR-PSS 7.3-19 SEPTEMBER, 1985 4

O O

(a.c)

O 1

(

O\

6 i

O i

FIGURE 7 3 1-4 POIh7 ESTIMATE VECTOR FOR THYROID DOSE >300 REM 7.3-20 SEPTEMBER, 1985 i

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lO O '

(a.c)

O O

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FIGURE 7 3 1-5 POINT ESTIMATE VECTOR FOR LATENT CANCER FATALITIES EXCLUDING THYROID W APWR-PSS 7.3-21 SEPTEM3ER, 1985

O

)

O (a,c O

I O

FIGUPI 7.3 1-6 POIhT ESTIMATE VECTOR FOR POPULATION WHOLE BC0Y PJLN-RDi l

yAPWR-PSS 7.3-22 SEPTEMBER, 1985

O 1

O (a c)

O O

O .

FIGURE 7 3 2-1 DOMINAhT RD. EASE CATELORY C0f(TPlBLTIORS DAMAGE LEVEL 0.10E+01 0F CONSEQUENCE CATELORY EARLY FATALITIES W APWR-PSS 7.3-23 SEPTEMBER, 1985 0

e O

(8 C) e e

O FIGURE 7 3 2-2 DOMINAhT PLAhT STATE C0hTRIBtTIORS ,

DAMAGE LEVEL 0.10E41 0F CONSEQUENCE CATEGORY EARLY FATALITIES W

AP'dR-PSS 7.3-24 SEPTEMBER, 1985

---

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k I

I O  :

y- =

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FIGURE 7 3 2-3 DOMINAE INITIATING EVEhT CONTRIBWORS DAMAGE LEVEL 0.10E410F CONSEQUENCE f CATELORY EAPLY FATALITIES 1

!O '

, W APWR-PSS 7.3-25 SEPTEMBER, 1985

'U i

w. - .

O 9

(a.c) 9 0

O 0

DOMINAltr REEASE CATEGOEY C0hTRIBtrIOP.S O

FIGURE 7 3 2-4 DAMAGE LEVE 0.10E410F CONSEQUENCE-CATEGORY LATEhT CANCER FATALITIES y APWR-PSS 7.3-26 SEPTEMBER, 1985

I l

I F

(a c)

P 1

l t

O I l

t O

l FIGURE 7 3 2-5 DOKINAhT PU NT STATE C0!TTFlB WORS

{

DAMAGE LEVEL 0.10E410F CONSEQUENCE" CATEGORY U TENT CANCER FATALITIES W APWR-PSS 7.3-27 SEPTEMBER, 1985

9, l

0 (a.c) l e

G G

O

, _ E z.3. m _ _ _ _ _ _ _ ,s i DAMAGE LEVEL 0.10E41 OF CONSEQUENCE l

CATEGORY LATENT CANCER FATALITIES 7.3-28 SEPTEMBER, 1985 W APWR-PSS l

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7.4

SUMMARY

AND CONCLUSIONS I

The M APWR internal core melt frequency is calculated to be [ ] per (a',c) l' reactor year of operation. Based oh the containment analysis the frequency of serious release '(serious meaning containment is assumed to grossly exceed design basis leakage) is calculated to be no greater than [ ] per (a,c).

reactor year of operation (f rom Table 7.1-6).

The M APWR consequence analysis has been performed assuming the plant is located at each of two sites that are expected to be representative of ,.

possible future sites which might be chosen. i For tne W APWR at the Salem. site, the maximum mean number of acute fatalities for the worst release is calculated to be [ ). The maximum mean number of (a,c) early plus chronic exposure cancer fatalities for the worst release is calculated in Section 6 to be [ ]. For (a,c) most releases the mean acute fatalities are [ ). The frequency of (a c) l occurrence of these types of consequences is below [ ] (Table 7.2.1-11). (a c)

For the W APWR at the Byron site the maximum mean number of acute fatalities calculated for any release is [ ). The maximum mean number of latent early (a c) plus chronic exposure cancers for Byron is calculated to be [ (a,c) t-

] (from Section 6). The f requency of occurrence of these types of consequences is below [ ] per year (Table 7.3.1-11). (a,c)

I Due to the unique combination of plant features introduced in the M APWR design, the plant internal coremelt frequency is lower by a factor of [ ] (a,c)

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than typical conventional PWR designs.

The M APWR plant internal risk meets the NRC safety goal criteria on both of I the sites studied in this report.

O O W APWR-PSS 7. 4-1 . . September,1985 91120:10/090985 e

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