GNRO-2012/00014, Supplemental Information Pertaining to License Amendment Request for Standby Liquid Control System

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Supplemental Information Pertaining to License Amendment Request for Standby Liquid Control System
ML12082A039
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 03/21/2012
From: Krupa M
Entergy Operations
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
GNRO-2012/00014, TAC ME7860
Download: ML12082A039 (17)
v • d • e


Text

Entergy Operations, Inc.

P. O. Box 756 Port Gibson, MS 39150 Michael A. Krupa Director, Extended Power Uprate Grand Gulf Nuclear Station Tel. (601) 437-6694 GNRO-2012/00014 March 21, 2012 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Supplemental Information Pertaining to License Amendment Request for Standby Liquid Control System (TAC No. ME7860)

Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29

REFERENCE:

Entergy Operations, Inc. letter to the NRC (GNRO-2012/00001), License Amendment Request - Standby Liquid Control System, January 23, 2012 (ADAMS Accession No. ML12023A242)

Dear Sir or Madam:

In the referenced letter, Entergy Operations, Inc. (Entergy) requested approval of an amendment to Grand Gulf Nuclear Station, Unit 1 (GGNS) Technical Specification (TS) 3.1.7, Standby Liquid Control (SLC) System. The proposed license amendment request (LAR) reflects the enrichment of the boron-10 (B-10) isotope in the sodium pentaborate (SPB) solution, which is the credited neutron absorber. Increasing the enrichment of the B-10 isotope in the SPB solution effectively increases the available negative reactivity inserted by the SLC system without having to increase the systems storage capacity.

Following communication with the NRC staff, Entergy is supplementing its LAR with additional information provided in Attachment 1. Attachments 2 and 3 provide revised marked-up and clean pages of TS 3.1.7, respectively. Attachment 4 provides a markup of the related changes to the TS Bases for information only.

The No Significant Hazards Determination and the Environmental Consideration provided in the referenced letter are not impacted by this supplemental information.

This letter contains no new commitments.

If you have any questions or require additional information, please contact Guy Davant at (601) 368-5756.

GNRO-2012/00014 Page 2 of 2 I declare under penalty of perjury that the foregoing is true and correct; executed on March 21, 2012.

Sincerely, MAK/ghd Attachments:

1. Supplemental Information Pertaining to License Amendment Request - Standby Liquid Control System
2. Proposed Technical Specification Changes (Mark-up)
3. Proposed Technical Specification Changes (Clean Pages)
4. Changes to Technical Specification Bases Pages - For Information Only cc: Mr. Elmo E. Collins, Jr.

Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 1600 East Lamar Blvd.

Arlington, TX 76011-4511 U. S. Nuclear Regulatory Commission ATTN: Mr. A. B. Wang, NRR/DORL (w/2)

ATTN: ADDRESSEE ONLY ATTN: Courier Delivery Only Mail Stop OWFN/8 G14 11555 Rockville Pike Rockville, MD 20852-2378 State Health Officer Mississippi Department of Health P. O. Box 1700 Jackson, MS 39215-1700 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150

Attachment 1 GNRO-2012/00014 Grand Gulf Nuclear Station, Unit 1 SUPPLEMENTAL INFORMATION PERTAINING TO LICENSE AMENDMENT REQUEST STANDBY LIQUID CONTROL SYSTEM to GNRO-2012/00014 Page 1 of 3 SUPPLEMENTAL INFORMATION PERTAINING TO LICENSE AMENDMENT REQUEST STANDBY LIQUID CONTROL SYSTEM By application dated January 23, 2012, Entergy Operations, Inc. (Entergy) submitted a license amendment request (LAR) for NRC staff approval to amend the Grand Gulf Nuclear Station, Unit 1 (GGNS) Technical Specification (TS) 3.1.7, Standby Liquid Control (SLC)

System.1 This LAR supports the use of a sodium pentaborate (SPB) solution that has been enriched with the boron-10 (B-10) isotope.

Following communication with the NRC staff, Entergy is supplementing its LAR with additional information provided below. This supplemental information results in revisions to the proposed TS. Attachments 2 and 3 contain revised marked-up and clean TS pages, respectively. Attachment 4 contains revised marked-up TS Bases pages for information only.

Request for Information #1 Please define C and E in TS 3.1.7.

Supplemental Information Entergy proposes to revise Condition A, SR 3.1.7.5, and SR 3.1.7.9 to read as follows:

  • Condition A Product of Sodium Pentaborate concentration in weight percent (C) times Boron-10 enrichment in atom percent (E) < 420.
  • SR 3.1.7.5 Verify the percent weight of sodium pentaborate in solution (C) is < 9.5%.
  • SR 3.1.7.9 Determine Boron-10 enrichment (E) in atom percent.

Request for Information #2 Please address actions to ensure pump suction piping is not blocked in the event the temperature of the sodium pentaborate solution decreases below the minimum allowed temperature.

Supplemental Information Entergy proposes a new Surveillance Requirement (SR) 3.1.7.10, which requires verifying the piping between the storage tank and the pump suction is not blocked on a frequency of once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the temperature of the sodium pentaborate solution is restored to > 45°F.

1 Entergy letter to the NRC, License Amendment Request - Standby Liquid Control System, January 23, 2012 to GNRO-2012/00014 Page 2 of 3 The frequency of performing SR 3.1.7.10 once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the temperature of the sodium pentaborate solution is restored to > 45°F is acceptable in light of the daily temperature verification required by new SR 3.1.7.2 and the low probability that the piping will be blocked due to precipitation of the boron from solution.

Request for Information #3 Please revise Condition C to reflect the temperature being observed is the sodium pentaborate solution temperature.

Supplemental Information Entergy proposes to revise Condition C to read as follows:

Sodium pentaborate solution temperature < 45°F or 150°F Request for Information #4 Please provide additional information pertaining to suppression pool pH control discussed in Section 4.1.3 of the SLC system LAR.

Supplemental Information In Grand Gulfs license amendment application of NUREG-1465, Accident Source Terms for Light-Water Nuclear Power Plants,2 Entergy provided a method and associated calculation that showed the SPB solution from the SLC system was capable of controlling and maintaining long-term suppression pool water pH level at or above 7.0 throughout the entire 30-day period of a postulated accident. The NRC staff agreed with this determination, as documented in their Safety Evaluation for the amendment.3 Using the same methodology, Entergy has calculated the pH of the suppression pool water when enriched SPB is injected into the reactor core following an accident. This evaluation considered inputs that reflect extended power uprate conditions (i.e., operating at 4408 MWt),

which are conservative to conditions when operating at the current licensed thermal power (3898 MWt). Furthermore, the calculation assumes approximately 1,400 lbs. of SPB is in the pool, which conservatively models the SLC storage tank solution at minimum volume and minimum concentration.

Thus, it can be concluded that injecting an amount of SPB solution required by the proposed TS to satisfy the shutdown requirement also is sufficient to maintain suppression pool pH greater than 7.0 for at least 30 days post-accident.

2 Entergy letter to the NRC, GGNS Pilot Full-Scope Application of NUREG-1465 Alternative Source Term Insights, LDC 1999-082, January 21, 2000 3

NRC letter to Entergy, Grand Gulf Nuclear Station (GGNS), Unit 1 - Issuance of Amendment Re:

Full-Scope Implementation of an Alternative Accident Source Term (TAC No. MA8065),

March 14, 2001 to GNRO-2012/00014 Page 3 of 3 In addition, GGNS has a variety of means of introducing aqueous pH control chemicals from outside sources into the containment in the event they are necessary. GGNS Emergency Procedures currently contain instructions on how to mix up a batch of sodium pentaborate in the condensate storage tank (CST) with chemicals available in the warehouse and inject this solution into the reactor vessel with the High Pressure Core Spray (HPCS) system or the Reactor Core Isolation Cooling (RCIC) system. The HPCS system can also be aligned to inject this solution directly into the suppression pool. Entergy maintains over 7,000 lbs. each of anhydrous borax and boric acid onsite, which produces approximately 11,000 lbs. of SPB for use if needed.

Attachment 2 GNRO-2012/00014 Grand Gulf Nuclear Station, Unit 1 PROPOSED TECHNICAL SPECIFICATION CHANGES (MARK-UP)

Attachment 2 to SLC System GNRO-2012/00014 3.1.7 Page 1 of 4 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7 Standby Liquid Control (SLC) System LCO 3.1.7 Two SLC subsystems shall be OPERABLE.

Product of Sodium Pentaborate concentration APPLICABILITY: MODES 1 and 2. in weight percent (C) times Boron-10 enrichment in atom percent (E) < 420 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Concentration of boron A.1 Restore concentration 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> in solution in Limited of boron in solution Operation region. to Normal Operation 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> region.

AND Restore (C)(E) > 420 A.2 Perform SR 3.1.7.2. Once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> B. One SLC subsystem B.1 Restore SLC subsystem 7 days D. inoperable. to OPERABLE status.

D.1 E.1 E. C. Two SLC subsystems C.1 Restore one SLC 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> inoperable. subsystem to OPERABLE status.

for reasons other than Conditions A, B or C.

F. D. Required Action and D.1 Be in MODE 3. 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met. F.1 B. Sodium pentaborate solution volume < 4,200 gallons. B.1 Restore Volume to > 4,200 gallons. 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> C. Sodium pentaborate solution temperature < 45oF or C.1 Restore temperature >45oF and <150oF. 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

> 150oF.

GRAND GULF 3.1-21 Amendment No. 120

Attachment 2 to SLC System GNRO-2012/00014 3.1.7 Page 2 of 4 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.7.1 Verify available volume of sodium 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> pentaborate solution is within the limits of Figure 3.1.7-1.

> 4,200 gallons.

SR 3.1.7.2 Verify temperature of sodium pentaborate 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> solution is within the limits of Figure 3.1.7-2.

>45oF and <150oF.

SR 3.1.7.3 Verify temperature of pump suction piping 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is 75EF and 130EF.

31 days SR 3.1.7.4 Verify continuity of explosive charge. 31 days SR 3.1.7.5 Verify the concentration of boron in 31 days solution is within the limits of Figures 3.1.7-1 and 3.1.7-2. AND Verify the percent weight of sodium pentaborate in solution (C) is < 9.5%. Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after water or boron is added to solution AND Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after solution temperature is restored to

NOTE----------------------------------- 75EF Sodium pentaborate concentration (C), in weight percent, is determined by the performance of SR 3.1.7.5. Boron-10 45oF enrichment (E), in atom percent, is determined by the performance of SR 3.1.7.9. (continued)

Verify SLC System satisfies the following equation:

(C)(E) > 420 GRAND GULF 3.1-22 Amendment No. 120 to SLC System GNRO-2012/00014 3.1.7 Page 3 of 4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.1.7.6 Verify each SLC subsystem manual, power 31 days operated, and automatic valve in the flow path that is not locked, sealed, or otherwise secured in position, is in the correct position, or can be aligned to the correct position.

SR 3.1.7.7 Verify each pump develops a flow rate In accordance 41.2 gpm at a discharge pressure with the 1300 psig. Inservice Testing Program 1340 SR 3.1.7.8 Verify flow through one SLC subsystem from 18 months on a pump into reactor pressure vessel. STAGGERED TEST BASIS SR 3.1.7.9 Verify all heat traced piping between 18 months storage tank and pump suction is unblocked.

AND Determine Boron-10 enrichment in atom percent (E). Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after pump suction piping temperature is Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> restored to after boron is added 75EF to the solution.

INSERT A - New SR 3.1.7.10 GRAND GULF 3.1-23 Amendment No. 120 Next page is 3.1-26.

to GNRO-2012/00014 Page 4 of 4 INSERT A - New SR 3.1.7.10 SR 3.1.7.10 Verify piping between the storage tank and pump suction is not Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> blocked. after solution temperature is restored to > 45°F

Attachment 3 GNRO-2012/00014 Grand Gulf Nuclear Station, Unit 1 PROPOSED TECHNICAL SPECIFICATION CHANGES (CLEAN PAGES)

SLC System 3.1.7 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7 Standby Liquid Control (SLC) System LCO 3.1.7 Two SLC subsystems shall be OPERABLE.

APPLICABILITY: MODES 1 and 2.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Product of Sodium A.1 Restore (C)(E) 420 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Pentaborate concentration in weight percent(C) times Boron-10 enrichment in atom percent (E) < 420 B. Sodium pentaborate B.1 Restore volume to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> solution volume 4,200 gallons.

< 4,200 gallons.

C. Sodium pentaborate C.1 Restore temperature 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> solution temperature to 45°F and 150°F.

< 45°F or > 150°F.

D. One SLC subsystem D.1 Restore SLC subsystem 7 days inoperable for reasons to OPERABLE status.

other than Conditions A, B or C.

E. Two SLC subsystems E.1 Restore one SLC 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> inoperable for reasons subsystem to OPERABLE other than Conditions status.

A, B or C.

F. Required Action and F.1 Be in MODE 3. 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met.

GRAND GULF 3.1-21 Amendment No. 120

SLC System 3.1.7 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.7.1 Verify available volume of sodium 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> pentaborate solution is 4,200 gallons.

SR 3.1.7.2 Verify temperature of sodium pentaborate 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> solution is 45°F and 150°F.

SR 3.1.7.3 -------------------NOTE-------------------- 31 days Sodium Pentaborate Concentration (C), in weight percent is determined by the performance of SR 3.1.7.5. Boron-10 enrichment (E), in atom percent is determined by the performance of SR 3.1.7.9.

Verify SLC System satisfies the following equation: (C)(E) 420 SR 3.1.7.4 Verify continuity of explosive charge. 31 days SR 3.1.7.5 Verify the percent weight of sodium 31 days pentaborate in solution (C) is 9.5%.

AND Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after water or boron is added to solution AND Once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after solution temperature is restored to 45°F (continued)

GRAND GULF 3.1-22 Amendment No. 120

SL System 3.1.7 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.1.7.6 Verify each SLC subsystem manual, power 31 days operated, and automatic valve in the flow path that is not locked, sealed, or otherwise secured in position, is in the correct position, or can be aligned to the correct position.

SR 3.1.7.7 Verify each pump develops a flow rate In accordance 41.2 gpm at a discharge pressure with the 1340 psig. Inservice Testing Program SR 3.1.7.8 Verify flow through one SLC subsystem from 18 months on a pump into reactor pressure vessel. STAGGERED TEST BASIS SR 3.1.7.9 Determine Boron-10 enrichment in atom Once within 24 percent (E). hours after boron is added to the solution.

SR 3.1.7.10 Verify piping between the storage tank and Once within 24 the pump suction is not blocked. hours after solution temperature is restored to >

45°F GRAND GULF 3.1-23 Amendment No. 120 Next page is 3.1-26.

Attachment 4 GNRO-2012/00014 Grand Gulf Nuclear Station, Unit 1 CHANGES TO TECHNICAL SPECIFICATION BASES PAGES FOR INFORMATION ONLY

Attachment 4 to GNRO-2012/00014 SLC System B 3.1.7 Page 1 of 1 BASES SURVEILLANCE SR 3.1.7.8 and SR 3.1.7.9 (continued)

REQUIREMENTS Enriched sodium Demonstrating that all heat traced piping between the boron pentaborate solution is solution storage tank and the suction inlet to the injection made by mixing granular, pumps is unblocked ensures that there is a functioning flow enriched sodium path for injecting the sodium pentaborate solution. An pentaborate with water. acceptable method for verifying that the suction piping is Isotopic tests on the unblocked is to pump from the storage tank to the test tank sodium pentaborate and then draining and flushing the piping with demineralized solution to determine the water. The 18 month Frequency is acceptable since there is actual B-10 enrichment a low probability that the subject piping will be blocked must be performed once due to precipitation of the boron from solution in the heat within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after boron traced piping. This is especially true in light of the is added to the solution in daily temperature verification of this piping required by order to ensure that the SR 3.1.7.3. However, if, in performing SR 3.1.7.3, it is B-10 enrichment is determined that the temperature of this piping has fallen adequate. Enrichment below the specified minimum, SR 3.1.7.9 must be performed testing is only required once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the piping temperature is when boron addition is restored $ 75EF after the piping temperature has been made since enrichment < 75EF.

change cannot occur by any other processes.

REFERENCES 1. 10 CFR 50.62.

2. UFSAR, Section 9.3.5.3.
3. GNRI-91/00153, Issuance of Amendment No. 79 to Facility Operating License No. NPF Grand Gulf Nuclear Station, Unit 1, Regarding Standby Liquid Control System Technical Specifications, dated July 30, 1991.

SR 3.1.7.10 Demonstrating that the piping between the boron solution tank and the suction inlet to the injection pumps is not blocked ensures there is a functioning flow path for injecting the sodium pentaborate solution. An acceptable method for verifying the suction piping is not blocked is to pump from the storage tank to the test tank and then drain and flush the piping with demineralized water. If in performing SR 3.1.7.2, the temperature of the sodium pentaborate solution is found to have fallen below the specified minimum of 45°F, SR 3.1.7.10 must be performed once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the temperature is restored > 45°F.

GRAND GULF B 3.1-44 Revision No. 1

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