ML20058L731

Summary of 931108-09 Meeting W/Licensee in Rockville,Md Re Resolution of NRC Bulletin 88-008, Thermal Stresses in Piping Connected to Rcs. Agenda & List of Attendees Encl

ML20058L731
Person / Time
Site:	South Texas
Issue date:	12/13/1993
From:	Kokajko L Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
IEB-88-008, IEB-88-8, NUDOCS 9312170163
Download: ML20058L731 (8)

Text

'~

t'

1. 'o UNITED STATES

[

g

~ ,j

E NUCLEAR REGULATORY COMMISSION WASHING TON, D. C. 20555 o #

December 13, 1993

\ . . . . + j# ,

Docket Nos. 50-498 and 50-499 LICENSEE: Houston Lighting and Power Cc:::pany (HL&P)

FACILITY: South Texas Project, Units 1 and 2

SUMMARY

OF MEETING BETWEEN HOUSTON LIGHTING AND POWER, WESTINGHOUSE AND NRC TO DISCUSS RESOLUTION OF NRC BULLETIN 88-08, " THERMAL STRESSES IN PIPING CONNECTED TO REACTOR COOLANT SYSTEMS" The subject meeting was held on November 8 and 9, 1993. Enclosure 1 is the '

meeting agenda used. The list of attendees for each day is provided in Enclosure 2.

BACKGROUND On June 22, 1988, NRC issued Bulletin 88-08 requesting that each licensee (1) review the reactor coolant system (RCS) to identify any connected, unisolable piping that could be subjected to temperature distributions which would result in unacceptable thermal stresses, and (2) take action, where such piping is identified, to ensure that the piping will not be subjected to unacceptable thermal stresses. Supplement 1 of the Balletin, dated June 24, 1988, expanded the bulletin to include examinations of high stress locations including the base metal, as appropriate.

In a letter on November 20, 1989, Houston Lighting and Power Company, the licensee for South Texas Project (STP), stated that it had installed instrumentation at STP Unit I to monitor temperatures in unisolable sections of piping connected to the reactor coolant system (RCS), in accordance with Action 3 of Bulletin 88-08. By letter dated September 21, 1990, HL&P reported that an engineering evaluation (Westinghouse Electric Corporation report WCAP-12598) had determined that the ASME Section III, Class I design fatigue limit was satisfied for the normal charging, alternative charging, and auxiliary spray lines, under the assumption that the leakage continued over the life of the plant. Based on the evaluation, HL&P decided to remove the temperature monitoring instrumentation requested by Action 3. By letter of September 23, '

1992, NRC requested HL&P for additional information (RAI) regarding their response to Action 3 of Bulletin 88-08. By letter dated December 1, 1992, it was decided that a meeting to discuss the data, as well as the Westinghouse  ;

conclusions would be beneficial. ,

l MC Em C&HB CWV l 9312170163 931213 gDR ADOCK 0500 8 jo j m

MEETING

SUMMARY

At the November 8 and 9, 1993, meeting, the licensee and representatives from Westinghouse and Electric Power Research Institute (EPRI) informed the NRC staff of the progress made in addressing the issue of Bulletin 88-08 for STP.

An EPRI representative gave a brief overview of the objectives, program contents, and future plans of their program on thermal stratification, cycling and striping (TASCS). Westinghouse personnel presented a discussion of the ,

TASCS and Mitsubishi Heavy Industries (MHI) testing programs, including a brief description of the low temperature turbulent penetration test program, and the low and high temperature stratification test programs. They continued with a presentation on TASCS evaluation methodology as it pertained to STP.

The areas covered included height of stratified flows, heat transfer of stratified flows, thermal cycling zone, turbulent penetration length and thermal striping.

The licensee and its contractors presented the results of HL&P's monitoring and analysis efforts. This consisted of a description of the monitoring program, method of analysis, the residual heat removal analysis, the charging and alternate charging analysis, and the auxiliary spray line analysis. These -

lines were originally analyzed in 1990, and were subsequently evaluated using the current TASCS methodology. Both the 1990 analysis results and the TASCS methodology results were presented. An additional presentation on charging line stratification loading was provided to help answer questions posed by the NRC. The meeting concluded with a tour of the Westinghouse Test facilities and a discussion summarizing NRC concerns, and short- and long-term actions required by the licensee.

Because the discussions involved proprietary information, no information is included with this meeting summary. The licensee will comply with the requirements of 10 CFR 2.790 to provide proprietary and non-proprietary versions of the meeting handouts together with an affidavit as soon as the -

proprietary and non-proprietary versions have been prepared.

A resolution to Bulletin 88-08 was agreed upon. Since the EPRI TASCS methodology final report has not been published or reviewed, the staff decided not to make any determinatien regarding the TASCS methodology or turbulence penetration. Rather, the staff stated that if the fatigue life of critical components could be shown to be reasonably long, assuming worst-case expected temperature distribution and optimum cycling period, the licensee will have provided an acceptable plant-specific resolution to the bulletin. The licensee agreed to provide the NRC with the appropriate fatigue evaluations by December 1, 1993, which, following staff's review, will allow closure of Bulletin 88-08 for STP. The licensee also committed to provide a

6 f

supplement to WCAP-12598 (Proprietary) and WCAP-12646 (Nonproprietary), "NRC Bulletin 88-08, Evolution of Auxiliary Piping for South Texas Units 1 and 2", I that includes the new information presented during the meeting at a later i date. >

Original Signed By: -

Lawrence E. Kokajko, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosures:

DISTRIBUTION '

1. Meeting Agenda Docket File ' OGC

2. Attendance List NRC PDR EJordan .

Local PDR ACRS (10)

TMurley WJohnson, RGN-IV FMiraglia NRC Participants JCallan EPeyton JRoe TBergman EAdensam PDIV-2 R/F F

i F

i t

II E PDIV-2/LA PDIV-2/ INT. Phlf-2,4RM PDIV-2fD r NAME (p (n $Wjtk rg [ajko:RK SBlac[

o^tE ITKdb/93 11/ 4 /93 IS/ Ci /93 11/ 1 /93 / / t ewy (Ye2)/No (YeDNo

'~'

/be 40 Yes/f6)

'~

Yes/No 0FFICIAL RECORD COPY FILENAME: G:\ BULL 8808.MTG

.. . i cc w/ enclosures:

Mr. David P. Loveless Jack R. Newman, Esq.

Senior Resident inspector Newman & Holtzinger, P.C. ,

U.S. Nuclear Regulatory Commission 1615 L Street, N.W.

P. O. Box 910 Washington, D.C. 20036 Bay City, Texas 77414

-Licensing Representative Mr. J. C. Lanier/M. B. Lee Houston Lighting and Power Company City of Austin Suite 610 Electric Utility Department Three Metro Center 721 Barton Springs Road Bethesda, Maryland 20814 Austin, Texas 78704 Nreau of Radiation Control Mr. K. J. Fiedler State of Texas Mr. M. T. Hardt 1101 West 49th Street City Public Service Board Austin, Texas 78756 P. O. Box 1771 San Antonio, Texas 78290 Pufus S. Scott Associate Gene *al Counsel Mr. G. E. Vaughn Houston Lighting and Power Company Mr. T. M. Puckett P. O. Box 61867 Central Power and Light Company Houston, Texas 77208 P. O. Box 2121 Corpus Christi, Texas 78403 Mr. William T. Cottle Group Vice-President, Nuclear INPO Houston Lighting & Power Company Records Center South Texas Project Electric 700 Galleria Parkway Generating Station Atlanta, Georgia 30339-3064 Post Office Box 289 Wadsworth, Texas 77483 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. Joseph M. Hendrie 50 Bellport Lane Bellport, New York 11713 Judge, Matagorda County Matagorda County Courthouse 1700 Seventh Street Bay City, Texas 77414 Mr. James J. Sheppard General Manager, Nuclear Licensing Houston Lighting and Power Company ,

P. O. Box 289  ;

Wadsworth, Texas 77483 i

l

Enclosure 1 Acenda for Meetino Between i HL&P. Westinohouse. and NRC in Recard to Bulletin 88-08 t

Monday. November 8. 1993 1:30 pm Start of Meeting and Introductions

- NRC & Contractual support personnel (BNL and subcontractor)

- Houston Lighting and Power Company personnel

- Westinghouse personnel

- Others (e.g., EPRI) 1:45 pm ~ Meeting Objectives

2

00 pm ~ Discussion of Phenomena (PROPRIETARY)

- TASCS testing program

- MHI testing program

- Videotape 3:00 pm - TASCS Evaluation Methodology (PROPRIETARY)

- Note: Primary focus on South Texas Project, no'. generic

- Height of stratified flows

- Heat transfer of stratified flows

- Thermal cycling zone

- Turbulent penetration length

- Heat transfer of uniform flows 4:30 pm - Discussion and Question / Answer Session (PROPRIETARY) 6:30 PM - Adjourn  ;

Tuesday. November 9. 1993 ,

8:30 am Reconvene Meeting (PROPRIETARY)  :

- Continuation of discussion from previous day, if necessary 9:00 am ~ Review of HL&P Monitoring and Analysis (PROPRIETARY)

- Monitoring program

- Residual heat removal analysis

- Charging and alternate charging analysis

- Auxiliary spray line analysis 11:30 am - Lunch 1

12:30 pm ~ Discussion and Question / Answer Session (PROPRIETARY) ,

- Continuation of morning session, if necessary

- Time available for independent study, if necessary 4:00 pm ~ Tour of Westinghouse Test Facilities 6:00 pm ~ Summary and Conclusion

- Follow-up actions and documentation

- Final Remarks 6:30 pm Adjourn Meeting  !

f i

Enclosure 2 Atter, dance List Monday. November 8. 1993 NRC Lawrence E. Kokajko Suzie M. Wittenberg Mark Hartzman Terence L. Chan Westinahouse Seth Swamy David H. Roarty Pat Strauch i T.H. Liu Mary Ann Sinwell Bradley F. Maurer David P. Dominicis R. Michael Roidt Houston Liahtina and Power Comoany H. Ray Pate Patel Sam Michael Pacy fEl Jong H. Kim Brookhaven National Lab (NRC contractor)

Giuliano DeGrassi Georaia Tech (NRC contractor)

Prateen V. Desai I

2-Tuesd8Y. November 9. 1993 liRC Lawrence E. Kokajko Suzie M. Wittenberg Mark Hartzman Terence L. Chan Westinahouse Seth Swamy David H. Roarty Pat Strauch T.H. Liu Mary Ann Sinwell Bradley F. Maurer Houston Liahtino and Power Company H. Ray Pate Patel Sam  ;

Michael Pacy IfR1 .

Jong H. Kim Brookhaven National Lab (NRC contractor)

Giuliano DeGrassi Georaia Tech (NRC contractor)

Prateen V. Desai I

,