ML19260C468
| ML19260C468 | |
| Person / Time | |
|---|---|
| Issue date: | 09/10/1979 |
| From: | Burger C NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Hanauer S Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-01, REF-GTECI-PI, TASK-A-01, TASK-A-1, TASK-OR NUDOCS 8001030586 | |
| Download: ML19260C468 (2) | |
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MEl10RANDUM FOR:
S. H. Hanauer, Director Unresolved Safety Issues Program b
FR0ll:
C. W. Burger, Task Manager Task Action Plan A-1 Water Hammer
SUBJECT:
PROPOSED ADDITIONAL SCOPE OF UORK FOR TASK ACTION PLAN A-1 (TAP A-1)
The recent reorganization of NRR and subsequent transfer of TAP A-1 under the Unresolved Safety Issues Program (USIP) necessitated the assignment of new NRR Staff to carry on the Task.
During review and familiarization of the Task, the new TAP A-1 Staff indicated that it is essential to obtain a more definitive understanding of the safety sig-nificance of water hammer prior to development of any licensing documents.
Therefore, a series of meetings were arranged between TAP A-1 Staff flembers for the purpose of defining a course of action that would satisfy this concern.
The outcome of these meetings was the formalization of an additional scope of work for TAP A-1 agreed to by all Task Staff 11 embers and identified below for your consideration.
Proposed Additional Scope of Work:
1.
EG&G, using TAP A-1 developed methods, will analyze two cases as identified by the staff.
a) BUR primary feedwater line, containing a swing-type check valve, subjected to a postulated pipe rupture at the check valve.
b) BWR core spray system with rapid startup of a centrifugal pump and a quick opening valve to produce flow into a voided line using realistic parameters to the extent possible.
2.
TAP A-1 Staff will meet with those utilities whose plants account for the majority of water hanTner events as identified in the EGSG report (CAAP-TR-042) to discuss tN potential significance (i.e.,
possible magnitudes, consequences and corrective actions) of the reported water hammer events.
3.
EG&G, with TAP A-1 Staff input, will identify additional water hammer scenarios during normal and accident conditions that may not yet have occurred but have the potential to render redundant safety systems inoperable.
d 1700 183 R 601030
o S. H. Hanauer 4.
TAP A-1 Staff will select those identified scenarios needing further study.
5.
EG&G will establish the approximate magnitude of the hydraulic forces resulting from the staff selected scenarios with the exception of those events caused by steam bubble collapse.
6.
TAP A-1 Staff will then evaluate the safety significance of those selected scenarios from a realistic and conservative licensing point of view.
The estimated time required to complete this additional scope of work (items 1 thru 6) is seven months.
It is further estimated that the current TAP A-1 completion date of December 31, 1980 will be extended by the same amount of time.
The additonal cost for EGaG assistance has also been considered and is estimated to be approximately $50K.
In addition, I have notified the Probabilistic Analysis Staff of this intended scope and have requested their assistance.
It also must be noted that to ensure the success of TAP A-1 in a timely manner, it is essential that the currently assigned NRR Staff remain on the Task until completion.
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C. W. Burger, Ta, Manager Task Action Plan A-1 llater Hammer cc:
TAP A-1 Staff F. Rowsome, PAS 1700 184