NL-12-154, Unit Number 3 - Response to Request for Additional Information on Proposed License Amendment Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank

Unit Number 3 - Response to Request for Additional Information on Proposed License Amendment Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank

ML12340A439
Person / Time
Site:	Indian Point
Issue date:	11/14/2012
From:	Ventosa J Entergy Nuclear Northeast
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-12-154, TAC ME9263
Download: ML12340A439 (8)

Text

mýEnteWg Entergy Nuclear Northeast Indian Point Energy Center 450 Broadway, GSB P.O. Box 249 Buchanan, NY 10511-0249 Tel 914 254 6700 John A Ventosa Site Vice President NL-12-154 November 14, 2012 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Response to Request for Additional Information on Proposed License Amendment Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank (TAC No. ME9263)

Indian Point Unit Number 3 Docket No. 50-286 License No. DPR-64

REFERENCES:

1.

Entergy Letter NL-12-090 to NRC Regarding Proposed License Amendment Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank, dated August 14, 2012

2.

Entergy Letter NL-12-143 to NRC Regarding Response to Request for Additional Information on Proposed License Amendment Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank (TAC No. ME9263), dated October 25, 2012

3.

NRC Letter to Entergy Request for Additional Information Regarding Proposal to Align the Refueling Water Storage Tank and The Spent Fuel Pool Purification System (TAC No. ME9263), Dated October 15, 2012

Dear Sir or Madam:

Entergy Nuclear Operations, Inc, (Entergy) requested a License Amendment, Reference 1, to Operating License DPR-64, Docket No. 50-286 for Indian Point Nuclear Generating Unit No. 3 (1P3).

Entergy responded to a request for additional information in Reference 2. The proposed amendment would revise Technical Specification 3.5.4, to allow the non-seismically qualified piping of the Spent Fuel Pool (SFP) purification system to be connected to the Refueling Water Storage Tanks (RWST) seismic piping by manual operation of a RWST seismically qualified boundary valve under administrative controls for a limited period of time. On October 15, 2012 the NRC staff identified the need for additional information to complete their review (Reference 3). Entergy is providing additional information in response to this request (see Attachment).

There are no new commitments being made in this submittal. If you have any questions or require additional information, please contact Mr. Robert Walpole, IPEC Licensing Manager at (914) 254-

NL-12-154 Docket 50-286 Page 2 of 2 6710. A copy of this response is being submitted to the designated New York State official in accordance with 10 CFR 50.91.

I declare under penalty of perjury that the foregoing is true and correct. Executed on November 14, 2012.

Sincerely, JAV/sp

Enclosure:

Response to Request for Additional Information Regarding Connection of Non Seismic Purification Line to Refuel Water Storage Tank Drawings 9321-F-27503, Sheet 2, and 9321-F-27513 Sheet 2 cc:

Mr. Douglas Pickett, Senior Project Manager, NRC NRR DORL Mr. William Dean, Regional Administrator, NRC Region 1 NRC Resident Inspectors Mr. Francis J. Murray, Jr., President and CEO, NYSERDA Ms. Bridget Frymire, New York State Dept. of Public Service

ATTACHMENT TO NL-12-154 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING CONNECTION OF NON SEISMIC PURIFICATION LINE TO REFUEL WATER STORAGE TANK ENTERGY NUCLEAR OPERATIONS, INC.

INDIAN POINT NUCLEAR GENERATING UNIT NO. 3 DOCKET NO. 50-286

NL-12-154 Docket No. 50-286 Attachment Page 1 of 2 By letter dated August 12, 2012 (Accession No. ML12234A098), Entergy Nuclear Operations, Inc, (Entergy) submitted a license amendment request for U.S. Nuclear Regulatory Commission (NRC) review that would revise the Technical Specifications (TSs), for Indian Point Unit No. 3 (IP3). The changes would revise TS 3.5.4, "Refueling Water Storage Tank [RWST]," such that the non seismically qualified piping of the Spent Fuel Pool (SFP) purification system may be connected to the RWST's seismic piping by manual operation of a RWST seismically qualified boundary valve under administrative controls for a limited period of time for filtration of suspended solids from the RWST water. The NRC staff, in its letter of October 15, 2012 noted applicable regulatory criteria and identified that additional information was required in their review. The response to requested information follows:

Question 1 What are the assumptions and method used to determine the drain flow rate through the break in the non seismic line? Were worst/limiting conditions assumed and what are they? What was the flow rate through the break? What is the time for the tank to drain from 36.8 feet to 36 feet? (Can be answered by providing CALC-SI-0333).

Response

Flow through a postulated non-seismic pipe break is calculated in IP3-CALC-SI-03333, dated December 14, 2000. Flow is calculated using standard pipe flow methods as that found in Crane Technical Paper 410 (Flow of Fluids through Valves, Fittings, and Pipe). The pipe break is assumed to be a guillotine break in 2 inch line #135 at the Class III boundary immediately downstream of valve AC-725 on the discharge side of the purification pump (drawing 9321-F-27513 Sheet 2). Conservative assumptions include using RWST level at time of pipe rupture at 35.5 ft based on minimum indicated operator log, neglecting friction loss in 16 inch line #155, neglecting the pressure drop through the purification pump and assuming maximum RWST temperature of 120 F for calculating fluid density and viscosity.

Limiting conditions assumed include guillotine break location immediately downstream of purification pump at seismic Class Ill boundary and RWST level based on minimum indicated operator log.

The flow rate through the break was calculated to be 121.4 gpm.

The time to drain from 36.8 ft to 36 ft was calculated to be 61.8 minutes. Note that more than 46 additional minutes are available before reaching the minimum Technical Specification limit of 35' 4".

Question 2 Please provide a piping diagram showing the SFP loop including seismic boundaries.

Response

Drawings 9321-F-27503, Sheet 2, and 9321-F-27513 Sheet 2 are included in the Enclosure to this letter.

NL-12-154 Docket No. 50-286 Attachment Page 2 of 2 Question 3 Please provide the downstream distance from the last Seismic Category 1 valve (AC-725) and non seismically qualified piping. If there is a break in the non seismically qualified piping would the break flow in any way impede the operators ability to turn off the refueling water purification pump or close the required valves, or is there non seismically qualified piping on the operators ingress or egress pathways?

Response

AC-725 is the boundary between Class I and Class III. Piping downstream of AC-725 is non-seismic therefore the distance between AC-725 and the non-seismic piping is the distance to the last seismic restraint which is 7'3".

The safety evaluation (NSE 99-3-035 SFPC "RWST Purification Without Continuous Manning While Above Cold Shutdown") evaluated the environmental conditions under which the action may be performed. The valves are easily accessible and the exposure to the RWST water presents a slight risk of dose exposure, however a radiological review determined the risk to be non-consequential (less than the limits defined in General Design Criteria 19 and 10 CFR 20). Health Physics is required to be notified if there is exposure.

Question 4 What is the maximum purification flow if AC-727B is not throttled?

Response

Runout flow for the purification pump is 120 gpm as documented in calculation IP3-CALC-SI-03333.

NL-12-154 Docket No. 50-286 Attachment Page 1 of 1 ENCLOSURE TO NL-12-154 DRAWINGS 9321-F-27503, SHEET 2, AND 9321-F-27513 SHEET 2 ENTERGY NUCLEAR OPERATIONS, INC.

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