ML17019A073

(External_Sender) Davis-Besse Nuclear Station Information Request Related to Dbnps Mitigating Strategies FIP - Personnel Habitability

ML17019A073
Person / Time
Site:	Davis Besse
Issue date:	01/16/2017
From:	Nevins K J First Energy Services
To:	Hughey J D Japan Lessons-Learned Division
References
Download: ML17019A073 (5)

Text

1 NRR-PMDAPEm Resource From: Nevins, Kathleen J. <kjn evins@firstenergycorp.com>

Sent: Monday, January 16, 2017 12:00 PM To: Hughey, John

Subject:

[External_Sender] Additional Information on DBNPS FLEX Heat Habitability Attachments:White Paper - FLEX Heat Habitability.docxDuring the telephone call discussion held on January 11, 2017, the NRC staff requested clarification on wording used in the Davis-Besse Nuclear Power Station (DBNPS) Final Integrated Plan, Section 2.11.1, Ventilation.

The manner in which the section was written brought into question whether ventilation may be required in some areas. During the discussion, FENOC communicated to the NRC staff that this was not the intent. The intent was to describe that ventilation is not required; however, as resources are available, temporary ventilation equipment (capable of removing heat load) is available for use. The NRC staff requested that FENOC provide additional supporting information for this via e-mail so that the detail may be publicly available in ADAMS.

A white paper is attached to support that the worst case area temperatures remain low enough to allow operators to safety complete tasks without ventilation.

This e-mail and its attachment may be made publicly available in ADAMS.

Thank you.

Kathleen J. Nevins Fleet Licensing A-WAC-B1 Office: 330-315-6840

Cell: 567-277-0416

The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intende d recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notif y us immediatel y , and delete the original message.

Hearing Identifier: NRR_PMDA Email Number: 3276 Mail Envelope Properties (BN6PR05MB2914D9A9511F2A42CF0D4FA9CB7D0)

Subject:

[External_Sender] Additional Information on DBNPS FLEX Heat Habitability Sent Date: 1/16/2017 11:59:55 AM Received Date: 1/16/2017 12:00:01 PM From: Nevins, Kathleen J.

Created By: kjnevins@firstenergycorp.com Recipients: "Hughey, John" <John.Hughey@nrc.gov>

Tracking Status: None

Post Office: BN6PR05MB2914.namprd05.prod.outlook.com Files Size Date & Time MESSAGE 1732 1/16/2017 12:00:01 PM White Paper - FLEX Heat Habitability.docx 138218 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:

White Paper to clarify FIP Section 2.11.1, in that environmental conditions remain acceptable for personnel habitability during FLEX implementation without ventilation.

Page 1 of 3 Extreme heat conditions during an ELAP were considered to determine Davis Besse FLEX deployment strategies and timelines as app licable to ventilation. Calculations support that the worst case temperature in each area is low enough to allow operators to safely complete the mitigation tasks without deployment restoration of ventilation. NORM-LP-7201, DAVIS BESSE FLEX VALIDATION PROCESS REPORT, validated the FLEX strategy timelines with minimum crew manning assumed. The team concluded that ventilation can be deployed as resources become available. The following page from the validat ion report shows assignments of the 6 Station Blackout Equipment Operators (SBOEO) for the first 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> until additional resources are assumed per NEI 12-0

6.

White Paper to clarify FIP Section 2.11.1, in that environmental conditions remain acceptable for personnel habitability during FLEX implementation without ventilation.

Page 2 of 3 The table below was created to clarify the calculation cross reference to maximum area temperatures used for habitability revie ws. Location Description Max °F without ventilation Calculation HVSG High Voltage Switchgear Rooms 323, 324, 325 115.5°F C-ME-099.25-001 referencing Calc 24.001 (steady state calc) LVSG Low Voltage Switchgear Rooms 428/A/B, 429/A/B 114.4°F C-ME-099.25-001 referencing Calc 25.020 (Time vs. Temp calc showing temp plateau/steady state) CTRM Control Room 505 110.3°F C-ME-099.25-001 referencing Calc 57.001 (steady state calc) MP3 Mechanical Penetration Room 303 104°F C-ME-099.25-001 Fan Alley Rooms 500, 501, 515 104°F C-ME-099.25-001 SFP Spent Fuel Pool Room 300 104°F C-ME-099.25-001 RM100 BWST Pipe Chase Room 100/101 86°F C-ME-050.05-008 (steady state calc) RM124 CWRT 1 Room 124 95°F C-ME-050.05-008 (steady state calc)

EFWF 1 Emergency Feedwater Facility 118.5°F S&L Evaluation 2016-05980 (Time vs. Temp 0-2.5 hrs after ELAP; referenced in EFWF HVAC sizing calc C-ME-050.05-007) 1 EFWF ventilation is restored when 480V is aligned to EFWF MCC by T+2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> after ELAP, maintaining temperature 120°F. Time sensitive operator actions are discussed throughout the Final Integrated Plan and section 3.1.2 includes a table for those actions. Columns have been added to the table to combine the detail from the validation report (Reference Page 1) and maximum area temperatures (Reference table above). Time Sensitive Operator Action Task Description Time required for completion from Loss of all AC power Task Performed By Task Location Time in Area Maximum Equilibrium Room Temp assumed at T+0 FLEX Action 1 - Preserve RCS Inventory. Following a Station Blackout, isolate RCS Letdown and Reactor Coolant Pump Seal Return. 10 minutes CTRM Staff CTRM Continuous 110.3°F FLEX Action 2 -

Declare an ELAP. Following a Station Bl ackout, declare an Extended Loss of AC Power. 10 minutes CTRM Staff CTRM Continuous 110.3°F FLEX Action 3 -

DC Bus Load Shed.

Align 480V to E1 or E2 Following a Station Blackout, align DC Buses and Loads to extend the life of Station Batteries.

Connect Cables across HVSG Rooms to E1 or F1 for power to PZR Heaters 30 minutes for 1st phase and a total of 60 minutes for all actions.

180 minutes SBOEO1 Phase 1 SBOEO2 Phase 2

SBOEO2 LVSG LVSG HVSG 30 minutes 15 minutes

30 minutes 114.4°F 114.4°F 115.5°F FLEX Action 4 -

Manually Start the EFW Pump.

Following a Station Blackout and loss of all AFW, manually start the EFW Pump and supply inventory to SG1. 10 minutes CTRM Staff CTRM Continuous 110.3°F White Paper to clarify FIP Section 2.11.1, in that environmental conditions remain acceptable for personnel habitability during FLEX implementation without ventilation.

Page 3 of 3 Time Sensitive Operator Action Task Description Time required for completion from Loss of all AC power Task Performed By Task Location Time in Area Maximum Equilibrium Room Temp assumed at T+0 FLEX Action 5 - Provide inventory to SG2. Following a Station Blackout and AFW System Failure, manually align Emergency Feedwater to provide inventory to SG2. 90 minutes SBOEO5 MP3 25 minutes After alignment, SG2 flow control is required, but does not

require SBOEO5 to remain in area continuously 104°F FLEX Action 6 - Mechanically align FLEX Charging Pump for RCS inventory. Following a Station Blackout, mechanically align a FLEX Charging

Pump to provide inventory to the Reactor Coolant System. 150 minutes SBOEO1 RM100 or RM124 60 minutes After alignment, pump start and

stop is required, but does not require SBOEO1 to remain in area continuously 86°F 95°F FLEX Action 7 - Electrically align FLEX Charging

Pump for RCS inventory. Following a Station Blackout, electrically align a FLEX Charging Pump to provide inventory to the Reactor Coolant System. 150 minutes SBOEO6 RM100 RM 100, RM124 30 minutes Primary connection 120 minutes Alt connection 86°F 95°F FLEX Action 8 -

Electrically align 480 volt power to EFWF MCC. Following a Station Blackout, electrically align 480 volt power to the EFW Facility MCC. 150 minutes SBOEO6 EFWF 1 30 minutes After start, monitoring does not

require SBOEO6 to remain in area continuously 118.5°F FLEX Action 9 - Initiate RCS Cooldown. Following a Station Blackout, initiate cooldown of the Reactor Coolant System. 4.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> CTRM Staff SBOEO1 SBOEO3 SBOEO5 CTRM RM100 Fan Alley MP3 Continuous As Required, not continuous As Required, not continuous As Required, not continuous 110.3°F Based on time before required completion, expected time in area for task, effort required, and maximum area temperatures, it is reasonable to expect that the tasks can be performed without ventilation restoration or deployment. The FSGs have been written to deploy ventilation as resources become available. Wording in FIP section 2.11.1 had been interpreted to suggest that ventilation may be required in some areas. The intent was to describe that ventilation is not required, however, as resources are available, temporary ventilation equipment (capable of removing heat load) is available.