ML17289A929: Difference between revisions
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| issue date = 10/16/2017 | | issue date = 10/16/2017 | ||
| title = TSTF-542 Issue That Affects BWR5 and BWR6 Plants | | title = TSTF-542 Issue That Affects BWR5 and BWR6 Plants | ||
| author name = Mann B | | author name = Mann B | ||
| author affiliation = Excel Services Corp | | author affiliation = Excel Services Corp | ||
| addressee name = Honcharik M | | addressee name = Honcharik M | ||
| addressee affiliation = NRC/NRR | | addressee affiliation = NRC/NRR | ||
| docket = PROJ0753 | | docket = PROJ0753 | ||
| license number = | | license number = | ||
| contact person = Honcharik M | | contact person = Honcharik M | ||
| package number = ml17289A902 | | package number = ml17289A902 | ||
| document type = E-Mail | | document type = E-Mail | ||
| Line 18: | Line 18: | ||
=Text= | =Text= | ||
{{#Wiki_filter:From: Brian Mann <Brian.Mann@excelservices.com> Sent: Monday, October 16, 2017 9:26 AM To: Honcharik, Michelle Cc: Whitman, Jennifer; Cusumano, Victor | {{#Wiki_filter:From: Brian Mann <Brian.Mann@excelservices.com> | ||
Sent: Monday, October 16, 2017 9:26 AM To: Honcharik, Michelle Cc: Whitman, Jennifer; Cusumano, Victor | |||
==Subject:== | ==Subject:== | ||
[External_Sender] TSTF-542 Issue that affects BWR/5 and BWR/6 plants Attachments: Variation Discussion.docx | |||
Variation Discussion.docx Michelle, | : Michelle, We have found an issue with the TSTF-542 traveler that affects BWR/5 and BWR/6 plants. | ||
When High Pressure Core Spray (HPCS) is being credited as the operable ECCS subsystem to meet TS 3.5.2, "Reactor Pressure Vessel Water Inventory Control," Table 3.3.5.2-1 (RPV WIC Instrumentation) requires the HPCS Level 8 function (3.a) and the HPCS manual initiation function (3.e) to be operable. However, the Level 8 function closes the HPCS injection valve and prevents injecting water into the vessel until the water level drops below the setpoint, which is below the main team lines within the vessel. If a licensee were to have an unexpected draining event so severe that they want to use HPCS to respond, it's unlikely they would wait until the water level dropped that low before injecting. Instead, they could manually start the HPCS pump and defeat the Level 8 interlock to open the injection valve, rendering the Level 8 function inoperable. It doesn't make sense to us to require the Level 8 function if in most cases the licensee would make it inoperable to perform the function. | |||
We have found an issue with the TSTF-542 | We have drafted the attached variation discussion which removes the HPCS Level 8 function and HPCS manual initiation function from Table 3.3.5.2-1. The justification for crediting manually starting the HPCS pump and opening the valve is similar to the variations written by plants that do not have an ECCS manual initiation function in their design. | ||
When High Pressure Core Spray (HPCS) is being credited as the operable ECCS subsystem to meet TS 3.5.2, "Reactor Pressure Vessel Water Inventory Control," Table 3.3.5.2-1 (RPV WIC | We'd like to have a call with the NRC this week to discuss the variation. We believe it would be beneficial to the industry and the NRC to agree on a standard description. | ||
Instead, they could manually start the HPCS pump and defeat the Level 8 interlock to open the | Brian Brian D. Mann Vice President of Industry Programs and Services EXCEL Services Corporation Mobile (804) 339-7034 Main (301) 984-4400 E-mail: brian.mann@excelservices.com Web: www.excelservices.com Web: www.nukapedia.com}} | ||
We have drafted the attached variation discussion which removes the HPCS Level 8 function and HPCS manual initiation function from Table 3.3.5.2-1. | |||
The justification for crediting manually starting the HPCS pump and opening the valve is similar to the variations written by plants that do not | |||
We'd like to have a call with the NRC this week to discuss the variation. We believe it would be beneficial to the industry and the NRC to agree on a standard description. | |||
Brian | |||
Brian D. Mann Vice President of | |||
Latest revision as of 13:54, 29 October 2019
| ML17289A929 | |
| Person / Time | |
|---|---|
| Site: | Technical Specifications Task Force |
| Issue date: | 10/16/2017 |
| From: | Mann B Excel Services Corp |
| To: | Michelle Honcharik Office of Nuclear Reactor Regulation |
| Honcharik M | |
| Shared Package | |
| ml17289A902 | List: |
| References | |
| Download: ML17289A929 (1) | |
Text
From: Brian Mann <Brian.Mann@excelservices.com>
Sent: Monday, October 16, 2017 9:26 AM To: Honcharik, Michelle Cc: Whitman, Jennifer; Cusumano, Victor
Subject:
[External_Sender] TSTF-542 Issue that affects BWR/5 and BWR/6 plants Attachments: Variation Discussion.docx
- Michelle, We have found an issue with the TSTF-542 traveler that affects BWR/5 and BWR/6 plants.
When High Pressure Core Spray (HPCS) is being credited as the operable ECCS subsystem to meet TS 3.5.2, "Reactor Pressure Vessel Water Inventory Control," Table 3.3.5.2-1 (RPV WIC Instrumentation) requires the HPCS Level 8 function (3.a) and the HPCS manual initiation function (3.e) to be operable. However, the Level 8 function closes the HPCS injection valve and prevents injecting water into the vessel until the water level drops below the setpoint, which is below the main team lines within the vessel. If a licensee were to have an unexpected draining event so severe that they want to use HPCS to respond, it's unlikely they would wait until the water level dropped that low before injecting. Instead, they could manually start the HPCS pump and defeat the Level 8 interlock to open the injection valve, rendering the Level 8 function inoperable. It doesn't make sense to us to require the Level 8 function if in most cases the licensee would make it inoperable to perform the function.
We have drafted the attached variation discussion which removes the HPCS Level 8 function and HPCS manual initiation function from Table 3.3.5.2-1. The justification for crediting manually starting the HPCS pump and opening the valve is similar to the variations written by plants that do not have an ECCS manual initiation function in their design.
We'd like to have a call with the NRC this week to discuss the variation. We believe it would be beneficial to the industry and the NRC to agree on a standard description.
Brian Brian D. Mann Vice President of Industry Programs and Services EXCEL Services Corporation Mobile (804) 339-7034 Main (301) 984-4400 E-mail: brian.mann@excelservices.com Web: www.excelservices.com Web: www.nukapedia.com