ML21306A346
| ML21306A346 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 05/14/2019 |
| From: | Aron Lewin NRC/NRR/DRO/IRIB |
| To: | |
| Aron Lewin, NRR/DRO/IRIB, 415-2259 | |
| References | |
| TI 2515-193 | |
| Download: ML21306A346 (3) | |
Text
Temporary Instruction (TI) 2515/193 Cross Regional Panel Meeting Summary Page 1 of 2 Region 1
Site Hope Creek Panel Date 05/14/2019 Participants DLP: Nathan Sanfilippo, Joshua Miller, Kevin Roche DIRS: Aron Lewin R1: Chris Lally, Frank Arner R2: Reinaldo Rodriquez R3: Stuart Sheldon, Mark Haire R4: Ryan Alexander Details of issue The inspection identified that severe accident water addition (SAWA) flow indicators would not be reliable or functional because the SAWA flowpaths for both the flooded and non-flooded conditions are maintained dry until placed in service.
However, the flow instruments are of the Rosemount Annubar design and are required to be maintained filled and vented. The sensing lines for the instruments are not self-venting and one line also has high point vents within a locked high radiation room which the licensee had not recognized procedurally to dynamically vent when placing the system in service. These high point vents would need be vented as well as the instrument manifold and flow indicator itself. Therefore, the flow indication used to control the flowrate with flow control valves would not have been accurate. The team identified that existing procedures for placing either the SAWA pumps or the Diesel driven SAWA pump (non-flooded condition) did not contain steps to perform venting of the flow indications when the pumps would be placed in service and therefore would not be accurate or functional.
The PSEG final integrated plan (FIP) and NRC technical evaluation of Order EA-13-109, Phase 2, states that a minimum flowrate of 500 gpm would be established within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
Because the condition may result in erratic or inaccurate flow indication, the initial flowrates established would not have had accurate indication for the operators. As noted, the operators per procedure throttle associated flow control valves to maintain flow.
Proposed Resolution Green Details of Proposed Resolution The Performance Deficiency was determined to be More than Minor because it was associated with the procedure quality attribute of the reactor safety barrier integrity cornerstone.
Procedures were not adequate in that they would not have properly vented SAWA flow indicators, rendering them nonfunctional. This would complicate the response to a beyond design bases scenario and could have resulted in operators not providing the analyzed initial required flowrates or assumed flowrates.
This lack of proper indication would also impact pump protection during the non-flooded condition, as it cannot be certain that the
Temporary Instruction (TI) 2515/193 Cross Regional Panel Meeting Summary Page 2 of 2 parallel path 2-inch valve would be opened when pump flowrate was less than 100 gpm.
Panel Outcome Green Details of Panel Decision Panel agreed with proposed resolution of the issue.