ML20148N846

Summarizes Results of 781019 Meeting Re Mark II Generic Acceptance Criteria for Pool Dynamics.Mark II Owners Are Urged to Utilize Generic Intermediate Prog to Expedite Licensing Activities

ML20148N846
Person / Time
Site:	Limerick
Issue date:	11/21/1978
From:	Boyd R Office of Nuclear Reactor Regulation
To:	Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
References
NUDOCS 7811270262
Download: ML20148N846 (7)

Text

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f "% UNITED STATES

[.;, ,s., ?g NUCLEAR REGULATORY CCMMisslON

'; g.J gj WASHINGTON. D. C. MM s>;.4

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Docket fic. 50-352/50-353 k l

Mr. Edward G. Bauer, Vice President & General Counsel Philadelphia Electric Company 2301 Market Street Phi.ladelphia, Pennsylvania 19101

Dear Mr. Bauer:

SUBJ ECT: MARK II GEllERIC ACCEPTANCE CRITERIA FOR LEAD PLANTS -

LIMERICK GENERATING STATION, UllITS 1 & 2 Substantial progress was made at our meeting of October 19, 1978, with the Mark II owners toward resolution of the issues related to pool dynamics for the lead Mark 11 plants and allocation of staff technical resources for review of the generic Mark II Intermediate Program. The i

purpose of this letter is to summarize the meeting results and to state our intent on future efforts leading to the completion of staff review of these matters.

The most significant developments relate to the method of combining loads and . acceptability of the pool dynamics load criteria as discussed

, below:

- The staff believes that further extension of the approval for i SRSS methods to include combining SRV and OBE loads appears possible and certainly worth the investment of staff and applicant resources to review and develop a technically justi-fiable basis for licensing. We anticipate completion of our review of this matter before the end of the year, at which time we will specify conditions for the use of SRSS in the Mark Il program.

- Yha " rk it ec:=rs agreeo to adopt the NRC lead plant pool dyndinic load acceptance criteria with a limited number of exceptions. This agreement, in several cases, was based on favorable consideration of SRSS methods by the staff. The exceptions and the program to resolve the exceptions on a generic basis are described in Enclosure 1. Resolution of these exceptions to the NRC criteria is to be accomplished before the end of 1978.

7811270 M 1

- The Mark II owners idi.ntified the Intermediate Program tasks where a priority review by the staff is needed. The staff agreed to schedule a flovember meeting to discuss staff concerns related tc those tasks where sufficient information has been submitted to warrant a meeting (see enclosure 2).

I While this course of action will help to maintain the near term licensing schedules for the lead plants, resolution of those exceptions taken by the Mark II owners to the staff generic acceptance criteria would require a substantial portion of the staff's resources. As a result, we antici-pate some delay in our overall review of the Intermediate Program Tasks I through the end of 1978.

In recent weeks we have received several requests for plant-unique review of tasks already included in the Mark II owner's Intermediate P rogram. We will not give as high priority to such meetings as we do to generic program meetings. Recognizing the limitations on staff

! resources, we reiterate the need for the Mark II owners to utilize the generic Intermediate Program to the maximum extent possible The generic approach to resolution of the pool dynamics issues provides l

the greatest potential for completing the licensing activities in a timely manner for the plants utilizing Mark II containments.

s Sincerely,

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Roger S. Boyd, Director - - a Division of Project Management f Office of l1uclear Reactor Regulation

Enclosures:

1. . Exceptions to the flRC

( Mark II Pool Dynamic Load Acceptance Criteria

2. Priority Intermediate Program Tasks cc: See next page

Mr. Edward G. Bauer, Jr.

Vice President & General Counsel Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 cc: Troy B. Conner, Jr. , Esq.

Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.

Washington, D. C. 20006 W. William Anderson, Esq.

Deputy Attorney General Roon 512, Main Capitol Building Harrisburg, Pennsylvania 17120

. Frank R. Clokey, Esq.

I Special Assistant Attorney General i Roem 218, Towne House Apartments

P. O. Box 2063 Harrisburg, Pennsylvania 17105 Honorable Lawrence Coughlin House of Representatives Congress of the United States Washington, D. C. 20515 Roger B. Reynolds, Jr. , Esq.

324 Swede Street Norristown, Pennsylvania 19401 i

Willard C. Hetzel, Esq.

i 312 Main Street East Greenville, Pennsylvania 18041 Lawrence Sager, Esq.

Sager & Sager Associates 45 High Street Pottstown, Pennsylvania 19464 Joseph A. Smyth Assistant County Solicitor County of Montgomery Courthouse Norristown, Pennsylvania 19404 -

5 Mr. Edward G. Bauer, Jr. - -

• cc: Eugene J. Bradley Philadelphia Electric Company Associate General Counsel 2301 Market Street Philadelphia, Pennsylvania 19101 t

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I Enclosure 1 1

I Exceptions to NRC fiark II Pool Dynamic

! Load Acceptance Criteria i 1. Pool Swell Elevation (I.B.l.b)*

l The staff will identify before October 30, 1978 additional information I to be provided by the Mark II owners to support their new methodology described in response to Question 020.68. The Mark II owners will provide a schedule for responding to the NRC's information request, i

I j 2. Small Structure Impact Loads (I.B.3.a) l The Mark II owners will notify the staff of a time when they will be ready to discuss and justify their revised methodology.

i

3. Asymmetric Pool Swell Loads (I.B.5)

The Mark II owners will send a letter report to the staff including the description and justification of a more realistic methodology for I this load than the bounding methodology described in the ilRC acceptance criteria.

4. SRV Bubble _ Phasing (II.B.b)

The owners of the lead Mark II plants will propose a time when they will be ready to discuss and justify a generic methodology for establishing bubble phasing for the "T" quencher discharge device.

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• Load designation based on Load Summary Table and Acceptance Criteria in letter dated Se-terbar la , 'n7P 're- o. e. u rd to lead " ark It a -

i

2

5. SRV Bubble Frequency (II.B.c)

The owners of the lead Mark II plants will propose a time when they i will be ready to discuss and justify a new methodology for defining .

bubble frequency.

6. LOCA/SRV Submerged Drag Loads (III)

The staff will notify the Mark II owners of an acceptable meeting time with our consultants to discuss the Mark II owners revised methodology. Emphasis will be placed on items III.A.1 and III.A.2 related to the LOCA jet drag load and the "T" quencher zone of influence.

\

7. Submerged Boundary Load During Vent Clearing (I. A) i The Mark II owners will send a letter report to the NRC clarifying ,

1 the application of this load to the containment walls. Reference will be made to observed loads on the walls of the 4T facility.

Enclosore 2 Priority Intermediate Program Tasks

! *l. Dynamic Single and Multi-Vent lateral Loads

, **2. Submerged Structure Ring Vortex Model

• • 3. "T" Quencher Submerged Structure Loads

• • 4. "T" Quencher Air Clearing Leads

• 5. Refined Chugging Loads l' **6. "T" and Four-Arm Quencher Temperature Limit

• • 7. New Four-Arm Quencher Load Methodology 1

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• The staff is scheduling a meeting for November 1978 to discuss concerns associated with our review of these items -

l

• • The staff has not received sufficient documentation relating to these tasks to initiate a review.

M '% NtT ED ST ATES '

[# .n 'h NUCLEI. ;ULATORY CCMMISSION <

WASHINGTON, D. L. 2C535

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Dccket No. 50-352/50-353 l l

i Mr. Edward G. Bauer, Vice President & General Counsel l Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101

SUBJECT:

MARK II GENERIC ACCEPTANCE CRITERIA FOR LEAD PLANTS -

LIMERICK GENERATING STATION, UNITS 1 & 2 4

Substantial progress was made at . meeting of October 19, 1978, with the Mark II owners toward r..o iution of the issues related to pool dynamics for the lead Mark II plants and allocation of staff technical

, resources for review of the generic Mark II Intermediate Program. The purpose of this letter is to summarize the meeting results and to stato our intent on future efforts leading to the completion of staff review of these matters.

The most significant developments relate to the method of combining loads and acceptability of the pool dynamics load criteria as discussed below:

i - The staff believes that 'Jrther extension of the approval for

SRSS methods to include combining SRV and OBE loads appears .

possible and certainly worth the investment of staff and I applicant resources to review and develop a technically justi-fiable basis for licensing. We anticipate completion of our review of this matter before the end of the year, at which time

, we will specify conditions for the use of SRSS in the Mark II prograr.

- The Mark II owners 69 reed to adopt the NRC lead plant pool dynamic load acceptance criteria with a limited number of exceptions. This agreement, in several cases, was based on favorable consideration of SRSS methods by the staff. The exceptions and the program to resolve the exceptions on a -

generic basis are described in Enclosure 1. Resolution of l these exceptions to the NRC criteria is to be accomplished ('

before the end of 1978.

l l

. \

2..

- - The Mark II owners identified the Intermediate Program tasks

l where a priority review by the staff is needed. The staff

.i . agreed to schedule a November meeting to discuss staff ~.

l' concerns related to those tasks where sufficient information -

i has been submitted to warrant e meeting (see enclosure 2).

~i il While this ccurse of action will help to maintain the near term licensing ,

! schedules for the lead plants, resolution of those exceptions taken by the Mark II' owners to the staff generic acceptance criteria would require

{ a substantial portion of'the staff's resources. As a result, we antici-pate some delay in our overall review of the IntermeGiate Program Tasks through the end of 1978. ,

In recent weeks we have received.several requests for plant-unique

] review of tasks already included in the Mark II owner's Intermediate Program. We will not give as'high priority to such meetings as we do <

to generic program meetings. Recognizing the limitations on staff

!' resources, we reiterate the need for the Mark II owners to utilize the generic Intermediate Program to the maximum extent possible. The

! generic approach to resolution of the' pool dynamics issues provides the greatest potential for completing the licensing activities in a .

b timely manner for the plants utilizing Mark II containments.

• Sincerely,  ;

)

) %%. .s- k"\

Roger S. Boyd, Director _ _ a

! Division of Project Management Office of Nuclear Reactor Regulation 1

Enclosures:

1. Exceptions to the flRC Mark II Pool Dynamic Load Acceptance Criteria

2. Priority Intermediate Program Tasks cc; See next page

+.

__._____._______m m _ . _ . . - , ., __ , _ .b , _ . , _,,(

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Mr. Edward G. Bauer, Jr.

Vice President & General Counsel Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 l

cc: Troy B. Conner, Jr. , Esq.

Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.

Washington, D. C. 20006 W. William Anderson, Esq..

Deputy Attorney General Room 512, Main Capitol Building Harrisburg, Pennsylvania 17120

, Frank R. Clokay, Esq.

! Special Assistant Attorney General j Room 218, Towne House Apartments i P. O. Box 2003 Harrisburg, Pennsylvania 17105 Honorable Lawrence Ccaghlin

. House of Representatives Congress of the United States Washington, D. C. 20515 Roger B. Reynolds, Jr. , Esq.

324 Swede Street Norristown, Pennsylvania 19401 Willard C. Hetzel, Esq.

312 Main Street East Greenville, Pennsylvania 18041 Lawrence Sager, Esq.

Sager & Sager Associates 45 High Street Pottstown, Pennsylvania 19464 Joseph A. Smyth Assistant County Solicitor County of Montgomery Courthouse Norristown, Pennsylvania 19404 L.___.___.___ ___ . _ . _ . _ . . . . _ . _

.o.

v Hr. Edward G. Bauer, Jr. - -

cc: Eugene J. Bradley Philadelphia Electric Company -

Associate General Counsel .

2301 Market Street Philadelphia, Pennsylvania 19101 i

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Exceptions to NRC Mark II Pool Dynamic Load Acceptance Criteria l

ll; 1. Pool Swell Eleva_tj .. (I .B.l .b)*

! The staff will iuentify before October 30, 1978 additional information

! to be provided by the Mark II owners to support their new methodology described in response to Question 020.68. The Mark II owners will provide a schedule for responding to the NRC's information request.

2. Small Structure Impact Loads (I.B.3.al f

The Mark II owners will notify the staff of a time when they will be ready to discuss and justify their revised methodology.

3. Asymmetric Nol Swell Loads (I.B.5)

The Mark II owners will send a letter report to the staff including the description and justification of a more realistic methodology for i this load than the bounding methodology described in the NRC acceptance criteria.

4. SRV Bubble Phasing (II.B.b)

The owners of the lead Mark 11 plants will propose a time when they will be ready to discuss and justify a generic methodology for establishing bubble phasing for the "T" qimncher discharge device.

• Load designation based on Load Summary Table and Acceptance Criteria in letter dated September 14,107 fra ,c 9ayd to lecci :'a r I I ,:1 <

l, ,

2 i,

ii l{ 5. SRV Bubble frequency (II.B.c) l ll The owners of the lead Mark II plants will propose a time when they l!

l{ will be ready to discuss and justify a new methodology for defining

s li bubble frequency.

i 6. LOCA/SRV Submerged Drag Loads (III) l The staff will notify the Mark II owners of an acceptable meeting time with our consultants to discuss the Mark II owners revised lt l'

methodology. Emphasis will be placed on items III. A.1 and III. A.2 related to the LOCA jet drag load and the "T" quencher zone of I

influence.

b,

7. Submerged Boundary Load During Vent Clearing (I. A)

The Mark II owners will send a letter report to the NRC clarifying the application of this load to the containment walls. Reference will be made to cbserved loads on the walls of the 4T facility.

tt

Encloeure 2

, Priority Intermediate Program Tasks i

i *l. Dynanic Single and Multi-Vent Lateral Loads i

• • 2. Submerged Structure Ring Vortex Model

• • 3. "T" Quencher Submerged Structure Loads

• • 4. "T" Quencher Air C'learing Loads

• 5. Refined Chugging Loads

• • 6. "T" and Four-Arm Quencher Temperature Limit

• • 7. New Four-Arm Quencher Load Methodology l

l '.

\

l

• The staff is scheduling a meeting for November 1978 to discuss concerns associated with our review of these items

• • The staff has not received sufficient documentation relating to these tasks to initiate a review.

_ _ . _ _ _ _ _ . _ _