ML20206C552
| ML20206C552 | |
| Person / Time | |
|---|---|
| Issue date: | 10/25/1988 |
| From: | Chan T Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8811160319 | |
| Download: ML20206C552 (5) | |
Text
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October 25, 1988 LICENSEE:
WESTINGHOUSE OWNERS GROUP FACILITIES:
ASSOCIATED FACILITIES
SUBJECT:
MEETING SUM'tARY - THERMAL STRATIFICATION IN THE PRESSURIZER SURGE LINE - SEPTEMBER 29, 1988 The Westinghouse Owners Group (WOG) was requested to brief the staff on the status and direction of their efforts related to pressurizer surge line movement associated with significant thermal stratification within the surge line. This phenomenon had been observed at several Westinghouse designed facilities as well as a Babcock and Wilcox designed facility.
Much of the discussion centered upon the proposed methodology of resolving thh issue. This methodology is diagramatically illustrated in Enclosure 1.
The subject areas which were discussed are identified in Enclosure 2.
Specific data relative to direct observations ari/or analyses were those utilized frem a previous meeting (Beaver Valley-Meeting Summary dated September 20,1988)and data acquired from Trojan Nuclear Plant following a refueling outage in July 1988 (Letter fiom Portland General Electric Co. to NRC dated September 27,1988).
The staff informed the WOG that the NRC was issuing a Bulletin related to this chenomenon, and solicited co ments as to how the Bulletin's requirements might cornplement the WOG efforts. The WOG stated that the subcomittee's recomend-ations would be presented to the full comittee in mid-October, and requested that the staff consider the WOG's a prior to issuance of the Bulletin. pproved plan for resolution of this issue A list of Attendees is provided in Enclosure 3.
original signed by Terence L. Chan, Senior Project Manager Project Directorate V Division of Reactor Projects - 111,
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Enclosures:
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LICENSEE:
WESTINGHOUSE OWNERS GROUP i
t FACILITIES:
ASSOCIATED FACILITIES
SUBJECT:
MEETING
SUMMARY
- THERMAL STRATIFICATION IN THE PRESSURIZER SURGE LINE - SEPTEMBER 29, 1988 The Westinghouse Owners Group (WOG) was requested to brief the staff on the status and direction of their efforts related to pressurizer surge line movement
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associated with significant thermal stratification within the surge line. This phenomenon had been observed at several Westinghouse designed facilities as well as a Babcock and Wilcox designed facility.
Much of the discussion centered upon the proposed methodology of resolving this i
issue. This methodology is diagransnatically illustrated in Enclosura 1.
The subject areas which were discussed are identified in Enclosure 2.
Specific data relative to direct observations and/or analyses were those utilized from a j
previous meeting (Beaver Yalley-Meeting Susunary dated September 20,1988)and data acquired from Trojan Nuclear Plant following a refueling outage in July 1988 (Letter from Portland General Electric Co. to NRC dated September 27,1988).
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The staff informed the WOG that the NRC was issuing a Bulletin related to this I
phenomenon, and solicited cospents as to hw the Bulletin's requirerents might complement the WOG efforts. The WOG stated that the subcosuiittee's reccarend-ations would be presented to the full cossnittee in mid-October, and reouested that the staff consider the WDG's approved plan for resolution of this issue prior to issuance of the Bulletin.
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A list of Attendees is provided in Enclosu g 3,
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QUESTIONS FOR OWNER'S GROUPS ON SURGE LINE
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(1) History of impact or contact of surge line with pipe whip restraints.
(2) History of surge line support damage.
l (3) History of ISI (h0E) results of the surge line ano any history of cracking.
(4) Surge line material, diameter, and well thickness.
(5) Difference in piping iay out and its effects on thermal stratification.
(6) Operational (startup, shutdown, normal operation, accidents and transients) l
' delta T" between the hot leg and the pressurizer.
(7) Availability of seasured data (temperature, displacement, etc.) of the surge line and whether masuremnts are sufficient to detennine stratifica-tion and thermal stiiping effects.
(8) B&W (German Plant Data) - Muv1heim-Kaerifch Station.
I (9) Availability of analysis based on masured temperature data.
(10) Maximur calculated stress and location.
(11) CUF at end of life with and without accounting for thermal stratification ano thersal striping.
(12) Sumary of allowable operational cycles in the technical specificatica.
(13) Sumry of allowable operational time at maximum ' delta T'.
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(14) Operational changes that could mitigate the effects of surg = line strat-ification.
i (15) Plan of action to adoress surge line stratification causes and effects.
(16) Feasibility of using LBB on plants that have already been granted LB5 on this surge line.
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ENCLOSURE 3 LIST OF ATTENDEES NRC/WOG MEET!NG ON THERMAL STRATIFICATION IN THE PRESSURIZER SURGE LINE September 29, 1988 NPC WOG T. Chan R. Walker TU Electric L. Marsh J. Nuffett TV Electric P. Kuo A. Marvray TV Electric S. Hou R. Evans NUMARC C. Cheng O. Sibiga Corbustion Eng.
K. Wichman L. Connor Doc-Search Assoc.
S. Lee R. Newton Wisconsin Electric D. Terao R. Borsum Babcock & Wilcox S. Fabic B. Morgan Impe11 Corp.
G.DeGrassi(BYL)
G. Hau lmpell Corp.
W. Jensen J. Bailey Houston Power & Light R. Lobel J. Triggiani Westinghouse N. Kadtrbi B. Maurer Westinghouse H. Balukjian S. Swamy Westinghouse G. Antaki Westinghouse B. McIntyre Westinghouse Westinghouse D. Roarty G. Kannerdeiner -
Ouquesne Light Co.
D. Whitaker Duke Power R. Deese Duke Power SERCH/Bechtel S. Sharron
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