ML20081D687
| ML20081D687 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 03/15/1995 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20081D688 | List: |
| References | |
| NUDOCS 9503200365 | |
| Download: ML20081D687 (1) | |
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support of a TS change, dated November 11, 1991, to revise ASME Code Section XI and ESW pump surveillance testing. The resolution of these errors and results of actual system testing were used to support the currently proposed amendment.
2.2 Assessment The ESW system consists of two independent supply loops each with an ESW pump to provide cooling for e safe reactor shutdown.
The present Surveillance Requirement (SR) for testing of the ESW pumps specifies a minimum pump total developed head at zero flow for each ESW pump.
This is also known as a shut off head test. The proposed SR will alleviate the shortcomings of the current test by demonstrating the capability of the pumps to provide flow to the system and minimize the wear caused by shut off head testing.
The proposed SR would also decrease the minimum required flow to provide operational flexibility to deal with microbiologically induced corrosion (MIC) which restricts flow to the crescent area coolers.
To allow for reduced flow, the licensee has revised the system line-up, taken credit for the margin in the original cooler designs and revised calculated heat loads to remove excess conservatism.
The proposed SR will demonstrate that the ESW pump continues to remain operable. The acceptability of the proposed test to demonstrate pump operability was determined by the licensee, based on three factors:
- 1) a determination of minimum ESW system flow requirements; 2) an evaluation of the system hydraulic characteristics; and 3) the licensee's IST program procedures.
The results of the licensee's review of the above three areas are presented below.
2.2.1 System Flow Requirements The proposed SR specifies that each pump is to be tested by delivery of flow of "at least 1500 gpm to its respective loop." The proposed SR is written so that the pump test flow requirements are above the minimum flow of the ESWS.
This assures that pudip operability testing is done with flow above the minimum flow required by the system.
The minimum flow requirement to all components in the normally aligned configuration, which includes components required for design basis events, is 1400 gpm and 1438 gpm for trains A and B, respectively. The current SR calls for a 3250 gpm per pump. The proposed SR calls for a reduction in flow to l
1750 gpm per pump. This reduction in flow also reduces the heat removal l
capability of the system; however, according to the licensee, the system will l
continue to provide adequate heat removal capacity.
9503200365 950315 PDR ADOCK 05000333 P
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