ML14183A008

NRR E-mail Capture - RAI for TACs MF8124, MF8125, and MF8126 for Browns Ferry

ML14183A008
Person / Time
Site:	Browns Ferry
Issue date:	07/01/2014
From:	Farideh Saba Division of Operating Reactor Licensing
To:	Gerald Williams Tennessee Valley Authority
References
MF8124, MF8125, MF8126
Download: ML14183A008 (2)

Text

1 NRR-PMDAPEm Resource From:

Saba, Farideh Sent:

Tuesday, July 01, 2014 1:51 PM To:

Williams, Gordon Robert (grwilliams1@tva.gov)

Cc:

Schrull, Edward Dustin (edschrull@tva.gov)

Subject:

RAI for TACs MF8124, MF8125, and MF8126 for Browns Ferry Importance:

High Hi Gordon, Below are RAIs from for the subject TACs. As we agreed during the clarification call today, please respond to these RAIs by August 15, 2014.

SCVB RAI-1 The license amendment request letter dated November 22, 2013 identified a commitment (#2) for periodic radiography inspection of the 0.1875-inch orifice (parallel to valve FCV-1-58) to be performed during refueling outages.

a.

Is this frequency to be each refueling outage?

b.

With an orifice area this size, debris big enough to bridge the opening and significantly obstruct could be very small. Is the radiography reasonably assured of being capable of detecting such debris?

c.

Is the orifice flanged/bolted in place or welded? If flanged, why not remove and inspect the orifice/line rather than radiograph?

d.

Is there any operational way to verify this orifice is unobstructed?

SCVB RAI-2 The license amendment request letter states the Main Steam Stop and Control Valves are included in the preventative maintenance program. As such, one Main Steam Stop and one Control Valve is refurbished each outage. These valves are also tested each refueling outage for leak tightness and are highly reliable. The letter also indicates that the Generic Flow Area to HP Turbine is 0.0288 square inches. Describe the main steam stop and control valve leakage testing that verifies the flow area to the HP turbine is 0.0288 square inches or less.

SCVB RAI-3 The license amendment request letter proposed SR 3.6.1.3.10 reads: Verify leakage rate through each MSIV is 60 scfh and that the combined leakage rate for all four main steam lines is 85 scfh when tested at 25 psig. The frequency is stated as: In accordance with the Primary Containment Leakage Rate Testing Program. How is the combined steam line leakage criterion evaluated? Minimum pathway for assessing past operability, maximum pathway for leaving cold shutdown? Some other basis?

Thanks, Farideh Farideh E. Saba, P.E.

Senior Project Manager NRC/ADRO/NRR/DORL 301-415-1447 Mail Stop O-8G9A Farideh.Saba@NRC.GOV

Hearing Identifier:

NRR_PMDA Email Number:

1409 Mail Envelope Properties (Farideh.Saba@nrc.gov20140701135000)

Subject:

RAI for TACs MF8124, MF8125, and MF8126 for Browns Ferry Sent Date:

7/1/2014 1:50:58 PM Received Date:

7/1/2014 1:50:00 PM From:

Saba, Farideh Created By:

Farideh.Saba@nrc.gov Recipients:

"Schrull, Edward Dustin (edschrull@tva.gov)" <edschrull@tva.gov>

Tracking Status: None "Williams, Gordon Robert (grwilliams1@tva.gov)" <grwilliams1@tva.gov>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 2251 7/1/2014 1:50:00 PM Options Priority:

High Return Notification:

No Reply Requested:

Yes Sensitivity:

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Recipients Received:

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