ML20141H441

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Forwards RAI Re Plant,Units 1 & 2 10CFR50.46 Annual Rept Providing Notification of Changes or Errors in Units 1 & 2 LOCAs
ML20141H441
Person / Time
Site: Beaver Valley  FirstEnergy icon.png
Issue date: 05/19/1997
From: Brinkmam D
NRC (Affiliation Not Assigned)
To: Cross J
DUQUESNE LIGHT CO.
References
TAC-M93775, TAC-M93776, NUDOCS 9705230304
Download: ML20141H441 (4)


Text

- - - . . . . .- .

l g May 19, 1997 .,

Mr. J. E. Cross

, President - Generation Group Duquesne Light Company  ;

Post Office Box 4 Shippingport, PA 15077  :

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING BEAVER VALLEY ,

POWER STATION, UNIT NOS. 1 AND 2 (BVPS-1 and BVPS-2) 10 CFR 50.46 ANNUAL REPORT (TAC.NOS. M93775 and M93776)

Dear Mr. Cross:

l By letter dated September 26, 1996, Duquesne Light Company (DLC) submitted an annual report required by 10 CFR 50.46 providing notification of changes or errors in the BVPS-1 and BVPS-2 loss-of-coolant accident analyses. The NRC staff has reviewed the subject submittal and has determined that additional  ;

information is required for us to complete our review of this submittal. The ,

additional information that is needed is identified in the enclosed RAI.  !

Please provide the requested additional information within 90 days of receipt of this letter to enable us to complete our re!iew within a timely manner.

Please contact me at (301)-415-1409 if you have any questions regarding this issue. .

Sincerely,

/S/

1 I

Donald S. Brinkman, Senior Project Manager Project Directorate 1-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos. 50-334/412 7

Enclosure:

Request for Additional l Information l

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May 19, 1997 '

Mr. J. E. Cross

' President - Generation Group'

- -Duquesne Light Company.

Post' Office Box 4  ;

-Shippingport, PA 15077  ;

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING BEAVER VALLEY <

POWER STATION, UNIT NOS. 1 AND 2 (BVPS-1 and BVPS-2) 10 CFR 50.46 4

ANNUAL REPORT (TAC N05. M93775 and M93776) ,

Daar Mr. Cross
'

o By letter dated September 26, 1996, Duquesne Light Company (DLC) submitted an l annual report required by 10 CFR 50.46 providing notification of changes or errors in the BVPS-1 and BVPS-2 loss-of-coolant accident analyses. The NRC

. staff has reviewed the subject submittal and has determined that additional  ;

information is required for us to complete our review of this submittal. The  ;

additional information that is needed is identified in the enclosed RAI. t Please provide the requested additional information within 90 days of receipt of this letter to enable us to complete our review within a timely manner.

Please contact me at (301)-415-1409 if you have any' questions 'regarding this j

... issue. )

1

( Sincerely,

?

M . g 2" L

Donald S. Brinkman, Senior Project Manager t Project Directorate I-2 Division of Reactor Projects - I/II

Office of Nuc. lear Reactor Regulation Docket Nos. 50-334/412

Enclosure:

Request for Additional Information

. cc w/ encl: See next page l

^

l I

. 1 J. E. Cross Beaver Valley Power Station Duquesne Light Company Units 1 & 2 cc: l Jay E. Silberg, Esquire Bureau of Radiation Protection Shaw, Pittman, Potts & Trowbridge Pennsylvania Department of 2300 N Street, NW. Environmental Resources i Washington, DC 20037 ATTN: Michael P. Murphy Post Office Box 2063 Director-Safety and Licensing Harrisburg, PA 17120 Department (BV-A) l Duquesne Light Company Mayor of the Borrough of l Beaver Valley Power Station Shippingrort '

PO Box 4 Post Office Box 3 Shippingport, PA 15077 Shippingport, PA 15077 i

Commissioner Roy M. Smith Regional Administrator, Region I West Virginia Department of Labor U.S. Nuclear Regulatory Commission

Building 3, Room 319 475 Allendale Road Capitol Complex King of. Prussia, PA 19406 Charleston, WVA 25305 Resident Inspector Director, Utilities Department U.S. Nuclear Regulatory Commission Public Utilities Commission Post Office Box 298 180 East Broad Street Shippingport, PA 15077 Columbus, OH 43266-0573 Director, Pennsylvania Emergency Duquesne Light Company Management Agency Beaver Valley Power Station Post Office Box 3321 PO Box 4 Harrisburg, PA 17105-3321 Shippingport, PA 15077 ATTN: S. C. Jain, Vice President Ohio EPA-DERR Nuclear Services (BV-A)

ATTN: Zack A. Clayton Post Office Box 1049 Columbus, OH 43266-0149 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando-Avenue State College, PA 16803 Duquesne Light Company Beaver Valley Power Station PO Box 4 Shippingport, PA 15077 ATTN: R. L. Grand, Division Vice President, Nuclear Operations Group and Plant Manager (BV-50SB-7) -

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, = _=. 7 . = = . - -. . - . - - - - - . _ - . .

I' Reauest for Additional Information Reaardina In CFR 50.46 Annual Reports Beaver Valley Pc ar Station. Unit Nos. I and 2 Docket Nos. 50-334 and 50-412 i

The NRC staff has reviewed the Beaver Valley Power Station, Unit Nos. I and 2 annual 10 CFR 50.46 report of September 26, 1996, submitted by the Duquesne i t Light Company (DLC). The submittal lacks sufficient detail to determine if 4

the licensee has correctly determined whether the errors, changes, etc. are significant per 10 CFR 50.46(a)(3)(1). It is also unclear whether the ,

licensee has taken appropriate actions >er 10 CFR 50.46(a)(3)(ii) based on its determinations. It appears from the su)mittal that large break (LB) loss-of-coolant accident (LOCA) analyses were appropriately considered; but, it appears that small break (SB) LOCA analyses were not appropriately considered.

For SBLOCA, DLC did not differentiate between permanent and temporary changes. .

This is important for the SBLOCA analyses where it appears that there are at least 190 'F of permanent change in the DLC assessment of adjusted peak cladding temperature (PCT) for both plants. For such a large PCT adjustment, '

10 CFR 50.46(a)(3)(ii) requires a proposed schedule for action to either

' modify the plant configuration to again conform with the licensing SBLOCA analysis of record or to reanalyze with an approved model for the present i

configuration. DLC also submitted a 10 CFR 50.46 report on March 21, 1997. i This more recent report is equally unclear with regard to SBLOCA analyses, and also likely does not satisfy the reporting requirements of 10 CFR 50.46 f (a)(3)(ii). '

From the inception of the emergency core cooling systems rule, the "LOCA

  • model" has been interpreted to be the analytical model covering all break sizes, types, locations, event chronologies and landmarks, and addressing all the criteria of 10 CFR 50.46 (b), as if this were contained in one calculational model. There are still " single" models in use by certain  :

vendors; however, it has become common, for various reasons, to treat large  ;

'. break and small break LOCA models as variant subsets of the overall LOCA l methodology. '

Licensees are required by 10 CFR 50.46(a;(3)(ii) to perform two assessments,

, one to determine if safety is compromised (2200 *F criterion), and the other to determine if the explicit analysis of record (calculated with an approved i

model) retains precision (50 *F, sum of absolute values of changes, +

, criterion). In the safety assessment, all changes are summed to determine a  :

net peak cladding temperature (PCT), as apparently has been done. To address l 4

L the 50 *F criterion, only the absolute values of " permanent" changes are summed.

Since the overall LOCA methodology is no more precise than its most '

? imprecise constituent, both assessments must be performed for both the LBLOCA l and the SBLOCA constituents of the LOCA methodology. These assessments must i

be reported annually and when assessments indicate necessary according to ,

10 CFR 50.46 requirements. Additionally, corrective actions and schedular t commitments for hath LBLOCA and SBLOCA constituents of the LOCA methodology l must be provided in accordance with schedules provided in 10 CFR 50.46.  ;

4

i. DLC is requested to submit information to clarify / rectify the September 26,  !

1996,'and March 21, 1997 reports, specifically with regard to SBLOCA analyses,  !

for both units.

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