ML19321A375
| ML19321A375 | |
| Person / Time | |
|---|---|
| Site: | LaSalle, Zimmer, Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 06/27/1980 |
| From: | Teh-Chiun Su Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19321A376 | List: |
| References | |
| REF-GTECI-A-39, REF-GTECI-CO, TASK-A-39, TASK-OR NUDOCS 8007230252 | |
| Download: ML19321A375 (3) | |
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Generic Task A-39 Docket Nos: 50-358 50-373 50-374 50-322 APPLICANTS: Mark II Lead Plants - LaSalle, Shoreham and Zirrer
SUBJECT:
MEETING WITH PARK II LEAD PLANT APPLICANTS TO DISCUSS T-QUENCHER LOAD DEFINITION, JUNE 13, 1980 BACKGROUND:
The purpose of this meeting was to discuss the nethodology proposed by the applicants for the Mark II lead plants to define the T-quencher load specification following safety / relief valve actuation. Dr. H. Chau, chairman of the Mark II Owners Group, stated that the new methodology 4
would be a generic method that was applicable for all the Mark II lead i
plants. However, individual plants could choose not to use this method.
An attendance list and a copy of the handouts are enclosed.
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SUMMARY
The current acceptance criteria for SRV loads specify that the loads spec-ification described in the Susquehanna Design Assessment Report should be used for all Mark II lead plants using the T-quencher device. This report specifies that a constant rultiplier of 1.5 should be apolied for all SRV loads obtained from in-plant tests perfomed at a foreign BWR plant and used as the basis for T-quencher load specification. However, a multiplier of 1.1 for the first SRV actuation and 1.5 for subsequent actuations were approved by the staff as a result of evaluating the confimatory tests conducted by KWU at Karlstein, Germany. The applicants for the Mark Il i
lead plants believe that these multipliers will still result in excessively i
conservative SRY loads. Therefore, they employed Krafwerk Union (XWU) of Gemany to develop a new methodology for calculating the multiplier.
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t Mark II lead Plants l Dr. D. Goebel of KWU presented the new methodology for detemining the multipliers both for air bubble oscillating frequencies and pressure amplitude. The frequency multipliers were calculated by KWU analytical models to account for the effects of pool surface area per quencher, sub-mergence depth of the quencher device and the wetwell pressure.
Idealized forcing fumotions were also generated. Results of these calculated forcing functions with the frequency range, which are deternined by the multipliers, are then' compared with the " representative of a full scale T-quencher. Dr.
Goebel indicated that the comparison is very favorable. Application of the methodology for the Shoreham plant will further de6onstrate the adequacy of this method.
With respect to the pressure amplitude multiplier, a correlation was develooed on the basis of Karlstein T-quencher tests. Detailed justification for the correlation was not presented in the meeting. Reports describing the basis for this methodology will be submitted for the staff review by July 1930.
The staff indicated that the methodology as outlined by Dr. Goebel appeared to be a viable approach. If this new method is accepted, we will incorporate it in the Mark II T-quencher NUREG report to be published by October 1980.
Tsung Ming Su A-39 Task Manager Generic Issues Branch, Division of Safety Technology
Enclosure:
Mark II Lead Plants Meeting, June 13, 1980 t
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MARK II LEAD PLANTS MEETING t
JUNE 13,1980 T. Su NRR/ DST /GIB Forouk Eltawila NRR/DSI/CSB Peter Huber
'!IT/BNL C. Economos BNL C. Lin BNL J.E. Metcalf S&W i -
Albert Y. C. Yong S&H Lothar Sack UHU Dietrich Goebel UWU T.M. Lee f!RC/RES l
H. Chau Long Island Lightina Co.
I C. Arredondo CNSNS/!1EX K. Green Sargent & Lundy
[S.J.Yerardi S&W D.F. Roth Pennsylvania Power
& Light i
E.J. Brabazon S&W B.R. Mc Caffrey LILCO J. N. Wilson NRC i
i J.A. Kudrick NRR/DSI/CSB j
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