ML101160135

E-mail Request for Additional Information #2 Regarding the License Amendment, North Anna, Unit 1 and 2, ECCS Pump Room Exhaust Air Cleanup System TS 3.7.12

ML101160135
Person / Time
Site:	North Anna
Issue date:	04/26/2010
From:	V Sreenivas Plant Licensing Branch II
To:	Heacock D Virginia Electric & Power Co (VEPCO)
Sreenivas V.NRR/DORL/LPL2-1 415-2597
References
TAC ME2413, TAC ME2414
Download: ML101160135 (4)

Text

From: Sreenivas, V Sent: Monday, April 26, 2010 10:14 AM To: 'david.heacock@dom.com' Cc: 'Tom Shaub'; 'jay.leberstien@dom.com'; 'page.kemp@dom.com'; Benton, Laray; Cotton, Karen; Kulesa, Gloria

Subject:

REQUEST FOR ADDITIONAL INFORMATION #2, REGARDING THE LICENSE AMENDMENT, NORTH ANNA, UNITS 1 AND 2, ECCS PUMP ROOM EXHAUST AIR CLEANUP SYSTEM (PREACS) TS 3.7.12 REQUEST FOR ADDITIONAL INFORMATION (RAI) FOR NORTH ANNA POWER STATIONS (NAPS)

(TAC NOS. ME2413 AND ME2414)

B.1.1 Verify ECCS leakage log is less than the maximum allowable unfiltered leakage. B.1.2 Verify by field walkdown that ECCS leakage is less than the maximum allowable unfiltered leakageC.1.1 Verify ECCS leakage log is less than the maximum allowable unfiltered leakage. C.1.2 Verify by field walkdown that ECCS leakage is less than the maximum allowable unfiltered leakageD.1.1 Verify ECCS leakage log is less than the maximum allowable unfiltered leakage. D.1.2 Verify by field walkdown that ECCS leakage is less than the maximum allowable unfiltered leakage In addition, the proposed change includes surveillance requirements that requires ECCS leakage operating parameters to be monitored by walking down the areas every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> in order to determine whether or not filtration capability is required (Action B.1.2). Establishing monitoring on a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> frequency is based on operating history, which indicated that a sudden change in ECCS leakage is not expected, and the conservatisms in the design basis dose calculations. If total ECCS leakage is equal to or greater than the maximum allowable unfiltered leakage limit then the filtration capability of ECCS PREACS is required and actions must be taken to restore Operability of the filter within seven days (Action B.2) consistent with an inoperable PREACS train for any other reason.B.1.1, C.1.1, and D.1.1, a Since the air within the ECCS pump rooms is exhausted by the ECCS PREACS and is aligned to the filters post-accident, a larger amount of ECCS leakage can be accommodated in these rooms. The maximum amount of ECCS leakage that can be accommodated in both the pump rooms (filtered) and remaining areas (unfiltered) is established by the assumption in the analysis (dose) of record. This relationship is shown in Figure 15.4-111 of Revision 44 of the UFSAR.

Procedures which address monitoring of ECCS leakage include provisions such that the ECCS leakage measurement will be adjusted by conservative calculation to reflect the accident conditions (i.e., higher leakage due to higher system operating pressure). Therefore, there is assurance that actual leakage during an accident will be less than or equal to the operating parameter of ECCS leakage identified prior to the accident.

___________________________ V. Sreenivas, PH.D., C.P.M.,

Project Manager, Rm.#O8F6, LPL2-1 North Anna Power Reactors, Units 1 and 2 Division of Operating Reactor Licensing-NRR (301) 415-2597, v.sreenivas@nrc.gov

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Subject:

REQUEST FOR ADDITIONAL INFORMATION #2, REGARDING THE LICENSE AMENDMENT, NORTH ANNA, UNITS 1 AND 2, ECCS PUMP ROOM EXHAUST AIR CLEANUP SYSTEM (PREACS) TS 3.7.12

Sent Date: 4/26/2010 10:14:25 AM Received Date: 4/26/2010 10:14:00 AM From: Sreenivas, V

Created By: V.Sreenivas@nrc.gov

Recipients:

david.heacock@dom.com ('david.heacock@dom.com')

Tracking Status: None tom.shaub@dom.com ('Tom Shaub')

Tracking Status: None jay.leberstien@dom.com ('jay.leberstien@dom.com') Tracking Status: None page.kemp@dom.com ('page.kemp@dom.com')

Tracking Status: None Laray.Benton@nrc.gov (Benton, Laray)

Tracking Status: None Karen.Cotton@nrc.gov (Cotton, Karen)

Tracking Status: None Gloria.Kulesa@nrc.gov (Kulesa, Gloria)

Tracking Status: None

Post Office:

HQCLSTR02.nrc.gov

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MESSAGE 20726 4/26/2010

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