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 First Energy Services
To:	John Hughey Japan Lessons-Learned Division
References
Download: ML17019A073 (5)

Text

NRR-PMDAPEm Resource From: Nevins, Kathleen J. <kjnevins@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.docx During 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 intended 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 notify us immediately, and delete the original message.

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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.

Extreme heat conditions during an ELAP were considered to determine Davis Besse FLEX deployment strategies and timelines as applicable 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 validation 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 12-06.

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

The table below was created to clarify the calculation cross reference to maximum area temperatures used for habitability reviews.

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)

EFWF1 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 Task Description Time required for Task Performed By Task Location Time in Area Maximum Operator Action completion from Loss of Equilibrium all AC power Room Temp assumed at T+0 FLEX Action 1 - Following a Station Blackout, isolate 10 minutes CTRM Staff CTRM Continuous 110.3°F Preserve RCS RCS Letdown and Reactor Coolant Inventory. Pump Seal Return.

FLEX Action 2 - Following a Station Blackout, declare an 10 minutes CTRM Staff CTRM Continuous 110.3°F Declare an ELAP. Extended Loss of AC Power.

FLEX Action 3 - Following a Station Blackout, align DC 30 minutes for 1st phase SBOEO1 Phase 1 LVSG 30 minutes 114.4°F DC Bus Load Buses and Loads to extend the life of and a total of 60 minutes SBOEO2 Phase 2 LVSG 15 minutes 114.4°F Shed. Station Batteries. for all actions.

115.5°F Align 480V to E1 Connect Cables across HVSG Rooms to 180 minutes SBOEO2 HVSG 30 minutes or E2 E1 or F1 for power to PZR Heaters FLEX Action 4 - Following a Station Blackout and loss of 10 minutes CTRM Staff CTRM Continuous 110.3°F Manually Start all AFW, manually start the EFW Pump the EFW Pump. and supply inventory to SG1.

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

Time Sensitive Task Description Time required for Task Performed By Task Location Time in Area Maximum Operator Action completion from Loss of Equilibrium all AC power Room Temp assumed at T+0 FLEX Action 5 - Following a Station Blackout and AFW 90 minutes SBOEO5 MP3 25 minutes 104°F Provide inventory System Failure, manually align After alignment, SG2 flow to SG2. Emergency Feedwater to provide control is required, but does not inventory to SG2. require SBOEO5 to remain in area continuously FLEX Action 6 - Following a Station Blackout, 150 minutes SBOEO1 RM100 60 minutes 86°F Mechanically mechanically align a FLEX Charging or After alignment, pump start and align FLEX Pump to provide inventory to the RM124 stop is required, but does not 95°F Charging Pump Reactor Coolant System. require SBOEO1 to remain in for RCS area continuously inventory.

FLEX Action 7 - Following a Station Blackout, 150 minutes SBOEO6 RM100 30 minutes Primary connection 86°F Electrically align electrically align a FLEX Charging Pump FLEX Charging to provide inventory to the Reactor RM 100, RM124 120 minutes Alt connection 95°F Pump for RCS Coolant System.

inventory.

FLEX Action 8 - Following a Station Blackout, 150 minutes SBOEO6 EFWF1 30 minutes 118.5°F Electrically align electrically align 480 volt power to the After start, monitoring does not 480 volt power to EFW Facility MCC. require SBOEO6 to remain in EFWF MCC. area continuously FLEX Action 9 - Following a Station Blackout, initiate 4.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> CTRM Staff CTRM Continuous 110.3°F Initiate RCS cooldown of the Reactor Coolant SBOEO1 RM100 As Required, not continuous Cooldown. System. SBOEO3 Fan Alley As Required, not continuous SBOEO5 MP3 As Required, not continuous 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.

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