ML12279A214

Request for Additional Information

ML12279A214
Person / Time
Site:	Hatch
Issue date:	10/15/2012
From:	Martin R Plant Licensing Branch II
To:	Ajluni M Southern Nuclear Operating Co
Martin, Robert
References
TAC ME9004, TAC ME9005
Download: ML12279A214 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 15, 2012 Mr. M. J. Ajluni Nuclear Licensing Director Southern Nuclear Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295, Bin - 038 Birmingham, AL 35201-1295

SUBJECT:

EDWIN I. HATCH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION (TAC NOS. ME9004 AND ME9005)

Dear Mr. Ajluni:

By letter dated July 5,2012 (Agencywide Documents Access and Management System Accession No. ML12188A7210, Southern Nuclear Operating Company, Inc. (SNC or the licensee), submitted a license amendment request to change the Technical Specification to revise the rninimum water level in the plant service water pump well. The U.S. Nuclear Regulatory Commission staff finds that additional information in the balance-of-plant area is needed as set forth in the Enclosure.

Please provide the additional information within thirty (30) days of the date of this letter.

Sincerely, r?o~r:l:::Z:ct Plant Licensing Branch 11-1 Manager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366 cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION EDWIN I. HATCH NUCLEAR PLANT, UNITS 1 AND 2 (HNP)

SOUTHERN NUCLEAR OPERATING COMPANY (SNC)

1. One of the bases for the minimum water level stated in proposed Surveillance Requirement 3.7.2.1 is the minimum submergence value for the pumps listed in Table 1 of SNC's July 5, 2012 submittal. Minimum submergence values are based on providing net positive suction head and preventing vortexing. Table 1 is as follows:

PUMP PSW Pump Well Minimum Water level for Minimum Submergence (ft MSL) I Unit 1 PSW pumps 59.1 I Unit 2 PSW pumps 59.3 Standby Service Water pump 60.0 Units 1 and 2 RHRSW pumps 59.8 Considering the following drawings, the staff requests additional information on how SNC developed the minimum water levels stated in Table 1 above.

1. Hatch Drawing S56317, "RHR Service Water Pumps w/Cutter Pump Modification,"

2. Hatch Drawing S52586, "PSW Pumps Outline and Parts Assembly-Stainless Steel Bowl Assembly,"

3. Hatch Drawing S60315, "RHR Service Water Pumps-Section Illustration 36 X 14 Type A Discharge,"

4. Hatch Drawing S60778, PSW Pump Outline and Parts Assembly,"

5. Hatch Drawing SX24108, "Outline Standby S.W. Pump,"

Request for Information

a. Discuss how SNC calculated the minimum submergence for each pump as listed in Table 1 above.

b. Explain why the minimum submergence values for the PSW pumps differ from the values presented in SNC's submittal of December 15, 2011 (that was later withdrawn).

2. Reference 1 in SNC's July 5,2012 submittal listed LCO 3.5.1, Minimum River Level, as:

- 2 If the water level, as measured in the pump well, is less than 61.2 feet MSL, the discharge from each plant service water pump will be throttled such that each pump does not exceed 7000 gpm.

The existing Technical Specifications (TS) do not have that requirement.

Request for Information Please explain how the requirement for throttling was removed from TS, and where is that requirement now stated?

ML12279A214 OFFICE DORULPL2-1/PM DORULPL2-1/LA** DLR/RERBIIBC*

NAME SFigueroa GCasto RPascarelli DATE 10/05/12 10/06/12 10/15/12