ML20134K161

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Forwards RAI Re Proposed Update of Pressurized Thermal Shock Assessment for Plant Reactor Vessel.Response Requested within 30 Days
ML20134K161
Person / Time
Site: Beaver Valley
Issue date: 02/10/1997
From: Brinkman D
NRC (Affiliation Not Assigned)
To: Cross J
DUQUESNE LIGHT CO.
References
TAC-M96303, NUDOCS 9702130163
Download: ML20134K161 (5)


Text

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  • February 10, 1997 "

i Mr..J. E. Cross ,

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President-Generation Group j

!'i Duquesne Light Company /Mj  ;

Post Office Box 4 l l Shippingport, PA 15077 n  :

j

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING PROPOSED UPDATE 0F THE PRESSURIZED THERMAL SHOCK ASSESSMENT FOR GEAVER VALLEY POWER

, STATION, UNIT NO. 1 (BVPS-1) REACTOR VESSEL (TAC NO. M96303) j

Dear Mr. Cross:

j By letter dated August 2, 1996, Duquesne Light Company (DLC) submitted a  !

reassessment of DLC's pressurized thermal shock (PTS) analysis for the BVPS-1 ,

! reactor vessel in accordance with the requirements of 10 CFR 50.61. This  !

submittal was vquired because DLC had obtained updated information which

! affected this assessment. The NRC staff has begun its review of the August 2, 1996, submittal; however, we have determined that additional information is ,

i required for us to complete our review. The additional information that is i

! required is described in our enclosed RAI. 'DLC is requested to provide its ,

! response to this RAI within 30 days of receipt of this letter for us to  ;

i complete our review within a timely manner. .

~

i Should you have any questions on this matter, please contact me on ' ]

(301) 415-1409.

]

l . Sincerely, i

Original signed by t

Donald S. Brinkman, Senior Project Manager l Project Directorate I-2 Division of Reactor Projects - 1/II Office of. Nuclear Reactor Regulation i Docket No. 50-334

Enclosure:

RAI cc w/ enclosure:

See next page nrcraraur m .

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, f j NUCLENA REGULATORY COMMISSION WA8HlNGTON, D.C. 20666 0001 l  % ,,, y February 10, 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 PROPOSED UPDATE OF THE PRESSURIZED THEP, MAL SHOCK ASSESSMENT FOR BEAVER VALLEY POWER STATION, UNIT NO. 1 (BVPS-1) REACTOR VESSEL (TAC NO. M96303)

Dear Mr. Cross:

By letter dated August 2, 1996, Duquesne Light Company (DLC) submitted a reassessment of DLC's pressurized thermal shock (PTS) analysis for the BVPS-1 reactor vessel in accordance with the requirements of 10 CFR 50.61. This submittal was required because DLC had obtained updated information which affected this assessment. The NRC staff has begun its review of the August 2, 1996, submittal; however, we have determined that additional information is required for us to complete our review. The additional information that is required is described in our enclosed RAI. DLC is requested to provide its response to this RAI within 30 days of receipt of this letter for us to complete our review within a timely manner.

Should you have any questions on this matter, please contact me on (301) 415-1409.

Sincerely, cwYk. $ $W Donald S. Brinkman, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation  ;

Docket No. 50-334

Enclosure:

RAI I cc w/ enclosure:

See next page l

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i 4

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J. E. Cross Beaver Valley Power Station  !

Duquesne Light Company Units 1 & 2 l cc:  ;

4 Jay E. Silberg. Esquire Bureau of Radiation Protection a

Shaw. Pittman. Potts & Trowbridge Pennsylvania Department of 2300 N Street. NW. Environmental Resources

Washington. DC 20037 ATTN: R. Barkanic  !

Post Office Box 2063 l l R. K. Brosi. Manager Harrisburg, PA 17120 Nuclear Safety Department (BV-A) l j Duquesne Light Company i Beaver Valley Power Station Mayor of the Borrough of PO Box 4 Shippingport  !

Shippingport. PA 15077 Post Office Box 3 l Shippingport. PA 15077  :

Comissioner Roy M. Smith I

! West Virginia Department of Labor Regional Administrator. Region I i Building 3. Room 319 U.S. Nuclear Regulatory Commission Capitol Complex 475 Allendale Road

Charleston. WVA 25305 King of Prussia. PA 19406 a

l John D. Borrows Resident Inspector l 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 i Director. Pennsylvania Emergency Duquesne Light Company i Management Agency Beaver Valley Power Station 4 Post Office Box 3321 PO Box 4 Harrisburg. PA 17105-3321 Shippingport. PA 15077 i ATTN
S. C. Jain. Vice President
Ohio EPA-DERR Nuclear Services (BV-A)
ATTN: Zack A. Clayton
Post Office Box 1049 l Columbus OH 43266-0149 l Dr. Judith Johnsrud National Energy Committee
Sierra Club 433 Orlando Avenue
State College PA 16803 I

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} RE00EST FOR ADDITIONAL INFORNATION REGARDING i AUGUST 2. 1996 PRES $URIZED THERNAL SH0CK (PTS) REASSESSNENT BEAVER VALLEY P0NER STATION. UNIT N0. 1 (BVPS-1) l DOCKET N0. 50-334

]

In reviewing the PTS reassessment submitted by Duquesne Light Company (DLC) j for the BVPS-1 reactor vessel on August 2,1996, the NRC staff noted that i several parts of the analysis had been reevaluated. In order to fully l understand the effect of these reevaluations, the NRC staff also examined:

I 1. DLC's response to Generic Letter (GL) 92-01 dated July 8, 1992 (J.D.

, Sieber (DLC) to the U.S. Nuclear Regulatory Commission Document Control i Desk) i 2. A DLC submittal on the BVPS-1 reactor vessel surveillance program dated 4

July 21,1977 (C.N. Dunn to the United States Nuclear Regulatory l l Commission) i i Licensees are required by 10 CFR 50.61 to evaluate pressurized water reactor i vessels for susceptibility to pressurized thermal shock and to establish the unirradiated reference temperature RT according to the procedures in

! Paragraph NB-2331 of the ASME Code. Mditionally,10 CFR 50.61 requires that ,

1 a standard deviation (a on the unirradiated reference temperature be l

determined " based upon f.)he precision of the test method."

l DLC's submittal in response to GL 92-01 (reference #1 above) indicated that l results from Charpy testing of Plate B6903-1 in the materials certification l test program were provided in Table 5 of that submittal. Additional.Charpy i testing of unirradiated Plate B6903-1 material was conducted in conjunction l with the vessel's surveillance program and the results of these tests were i submitted (along with the data from Table 5) in Table 10 of the response.

Since additional data regarding the unirradiated material properties of Plate B6903-1 has been obtained subsequent to the materials certification program:

i

! (1) Explain which data was used to determine RT for Plate B6903-1 and

which data was used to evaluate the unirradIaTd Charpy reference curve

} for the Plate B6903-1 surveillance material. If all of the data submitted in Table 10 of reference #1 are believed to be valid tests for I determining the material properties of Plate B6903-1, provide a technical justification for the exclusion of certain data points if all

, of the data was not used in either of these evaluations.

i (2) If any of this data was excluded in the determination of the Plate  ;

j B6903-1 RTenu):

j Enclosure

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, i (a) Explain how DLC's analysis meets the requirement of ASME Code i paragraph NB-2331(a)(4) which states that the reference temperature may be determined minimum data points "...from of all thea C, fulltes C, ts performed." impact curve developed f (b) Evaluate what impact the inclusion of the additional data would have j on DLC's determination of RT ercus or an.

l (3) Assess what impact any changes in RTm or a ifrom DLC's response to i question (2b.) would have on DLC's eval $ ation of the RT,,, vahe &  !

l Plate B6903-1. ,

(4) Submit for NRC staff review WCAP-14554, " Beaver Valley Unit 1 Fluence Reevaluation," dated June 1996 and referenced as the basis for the I fluence values used in the BVPS-1 PTS assessment. The NRC staff must review the fluence results to assess DLC's determination of the vessel's end-of-license fluence values and the fluence value? associated with the l vessel's surveillance capsules.

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