RC-16-0092, License Amendment Request LAR-12-02439, Technical Specification 3.5.4, Limiting Condition for Operation Refueling Water Storage Tank

From kanterella
(Redirected from ML16243A463)
Jump to navigation Jump to search

License Amendment Request LAR-12-02439, Technical Specification 3.5.4, Limiting Condition for Operation Refueling Water Storage Tank
ML16243A463
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 08/29/2016
From: Lippard G
South Carolina Electric & Gas Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
CR-12-02439, LAR-12-02439, RC-16-0092, TAC ME8952
Download: ML16243A463 (20)
v • d • e


Text

'-

I 41(_ SCE&G@

A SCANA COMPANY George A. Lippard Vice President, Nuclear Operations 803.345.4810 August 29, 2016 RC-16-0092 Document Control Desk U. S. Nuclear Regulatpry Commission Washington, DC 20555

Dear Sir I Madam:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 LICENSE AMENDMENT REQUEST - LAR 12-02439 TECHNICAL SPECIFICATION 3.5.4 LIMITING CONDITION F-OR OPERATION REFUELING WATER STORAGE TANK (RWST)

References:

1. SCE&G Letter from T. D. Gatlin to Document Control Desk (NRC),

"License Amendment Request-LAR 10-03912 Technical Specification Change Request for TS 3.5.4, Refueling Water Storage Tank (RWST)," dated June 29, 2012[ML121850005]

2. Letter from Robert E. Martin (NRC) to T.D. Gatlin (SCE&G), "Virgil C.

Summer Nuclear Station, Unit No. 1, Issuance of Amendment (TAC No. ME8952)," dated October 12, 2012[ML12270A301].

Pursuant to 1 OCFR50.90, South Carolina Electric & Gas Company (SCE&G), acting for itself and as an agent for South Carolina Public Service Authority, hereby requests an amendment to Technical Specifications (TS). The proposed amendment would remove the administrative controls.associated with the Limiting Condition for Operation (LCO) of TS 3.5.4, "Refueling Water Storage Tank." The evaluation of the changes proposed and the no significant hazards consideration are provided within the Enclosure.

In Reference 1, SCE&G submitted a TS change revising 3.5.4, "Refueling Water Storage Tank."

The amendment approved by Reference 2 allowed the nonseismically qualifiE;ld piping of the Spent Fuel (SF) purification system to be connected to the Refueling Water Storage Tank (RWST) under administrative controls. The TS change added a note to the LCO for TS 3.5.4 that allowed performance of the RWST surveillance requirements and system filtration. This proposed change will remove these administrative controls due to a station modification that will ensure the LCO is maintained.

The Enclosure provides the details of this proposed change and the results of the No Significant Hazards Considerations. Attachment 1 provides the TS pages marked up with the proposed changes. Attachment 2 provides a mark-up of the TS Bases for information only. Attachment 3 provides the retyped TS pages. Attachment 4 provides the retyped TS Bases. Attachment 5 provides a figure of the Spent Fuel purification system. Attachment 6 contains a list of Regulatory Commitments.

V. C. Summer Nuclear Station* P. 0. Box 88

  • Jenkinsville, SC* 29065
  • F (803) 941-9776

Document Control Desk RC-16-0092 CR-12-02439 Page 2 of 2 In accordance with 10CFR50.91, a copy of this application, with attachments, is being provided to the designated South Carolina Official.

This proposed change has been reviewed and approved by the VCSNS Plant Safety Review Committee and the VCSNS Nuclear Safety Review Committee.

SCE&G requests approval of the proposed amendment by August 31, 2017, which marks a year from this submittal. Once approved, the amendment shall be implemented within 60 days.

The proposed change does not include any new commitments. If you hqve any questions or require additional information, please contact Bruce Thompson at (803) 931-5042.

I certify under penalty of perjury that the information contained herein is true and correct.

'Executed on

~~

GeoA. Lippard JMG/GAL/wm

Enclosure:

Evaluation of Administrative Controls Associated With the LCO for TS 3.5.4, "REFUELING WATER STORAGE TANK" Attachments:

c:

1. Proposed Change - Marked Up TS Page
2. Proposed Bases Change - Marked Up TS Bases Page
3. Proposed TS Page - Retyped
4. Propose TS Bases Page-Retyped
5. Spent Fuei Pit Cooling Purification Loop RWST Riser Loop Seal Figure
6. List of Regulatory Commitments K. B. Marsh S. A. Byrne J.B. Archie N.S.Carns J. H. Hamilton S.*M. Shealy W. M. Cherry C. Haney J. W. Williams

. S. A. Williams NRC Resident Inspector K. M. Sutton P. Ledbetter S. E. Jenkins NSRC RTS (CR-12-02439)

File (813.20)

PRSF (RC-16-0092)

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 1 of 7 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS}

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ENCLOSURE EVALUATION OF ADMINISTRATIVE CONTROLS ASSOCIATED WITH THE LCO FOR TS 3.5.4, "REFUELING WATER STORAGE TANK"

Subject:

This license amendment request (LAR) is a request to amend the Technical Specifications (TS) for Virgil C. Summer Nuclear Station (VCSNS). The proposed change will remove administrative controls applied by Amendment No.

192, due to a modification that has been implemented to ensure the Limiting Condition for Operation (LCO) is maintained.

1.0

SUMMARY

DESCRIPTION This LAR is a request to amend the VCSNS TS by removing an asterisk from LCO 3.5.4 that defines operability of the Refueling Water Storage Tank (RWST) when connected to unisolated non-safety related, non-seismic piping and the allowable duration under administrative controls.

The static;>n has implemented a modification that ensures the continued operability of the RWST in the unlikely event of a failure of the non-safety related piping.

SCE&G submitted a TS change revising 3.5.4 by an amendment request provided in Reference 1. Amendment No. 192 was issued by Reference 2 that allowed the nonseismically qualified piping of the Spent Fuel (SF) purification system to be connected to the RWST under administrative controls. The TS change allowed performance of the RWST surveillance requirements and use of the filtration system with the provisions of Amendment No. 192 to expire after refueling (RF)-22 that was completed in the Fall of 2015. This proposed change will remove these administrative controls due to a modification that has been implemented and verified to ensure the LCO of the RWST is maintained.

VCSNS is requesting approval of this amendment to remove the administrative controls based on the modification to allow closure of this project.

2.0 DETAILED DESCRIPTION VCSNS TS 3.5.4, "Refueling Water Storage Tank," is applicable in Modes 1, 2, 3 and 4.

TS 3.5.4 contains a note that allows the RWST to align to an unisolated non-safety related, non-seismic Spent Fuel Cooling (SF) Purification system. The purification loop is needed for periodic cleaning and boron mixing of the safety related RWST. This note was added to TS by Amendment No. 192 (Reference 2). This proposed change is a request to remove the note

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 2 of 7 applied by Amendment No. 192 following a modification that was implemented during the fall 2015 refueling outage.

2.1 System Design and Operation The station implemented a permanent plant modification under 1 OCFR50.59 during the fall 2015 RF-22. The station installed a seismically qualified, safety related stand pipe, or riser loop seal, from the RWST that supports the inlet to the purification loop. The modification was designed to prevent drainage of the RWST below the current TS minimum volume when it is aligned to the non-seismically qualified SF purification system. Should a break occur in* the non-safety, non-seismic portion of SF purification system, the water level in the RWST will decrease until the siphon effect breaks in the riser loop seal. The RWST level after a siphon effect break was verified to be above the TS minimum tank volume during post modification testing. The Final Safety Analysis Report (FSAR) describes the spent fuel cooffng system in Section 9.1.3 of the FSAR.

The modification (Engineering Change Request 50879) installed a seismically qualified, safety related stand pipe, or riser loop seal, from the RWST that supports* the inlet to the purification loop. The modification used an existing nozzle on the RWST that supported the previously designed purification system and_ upgraded the supports to make the riser loop seismically qualified. The riser loop seal is positioned with sufficient elevation to maintain a required volume in the RWST and sized to allow adequate flow and Net Positive Suction Head to the SF Purification Pump. The RWST is protected by using a purification system return line at a higher elevation and maintaining the isolation valve for the lower return line locked closed in modes 1 through 4. The flow diagram is shown on FSAR Figure 9.1-3. A simplified flow diagram that reflects the RWST and the purification system is provided in Attachment 5. The purification system is operated under System Operating Procedure (SOP)-123, "Spent Fuel Cooling System."

The loop seal piping is located on the outside wall of the Auxiliary Building and provides a seismically qualified pipe to a level above the TS minimum tank volume. The top of the loop seal has a three inch vent line to break the siphon should a break in the SF Purification System occur. Suction is taken from the existing 10 inch pipe downstream of XVG06662-SF, Refueling Water Storage Tank Spent Fuel Isolation Valve, through the riser loop seal. The riser loop discharges into the 3 inch pipe upstream of XVT06701-SF, Refueling Water Storage Tank Spent Fuel Purification Header Supply Isolation Valve. A bypass line connecting the two legs of the riser loop was provided to allow for operation of the purification system at low tank volume levels. This bypass contains a locked closed valve, XVA78094-SF, RWST Loop Seal Bypass Isolation Valve. This valve is administratively controlled by OAP-106.3 "Locked Valve Program" and is locked closed in Modes 1 through 4.

The purification loop return line enters near the top of the RWST above the TS minimum tank volume. XVT06691-SF, Spent Fuel Cooling Purification Header Throttle Valve, is administratively controlled by the Locked Valve Program and is locked closed in modes 1 through 4 to prevent using a return path that is below the TS minimum tank volume through XVD06694-SF, Spent Fuel Purification Hydro Test Header Isolation Valve.

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 3 of 7 2.2 Current Technical Specification Requirements VCSNS TS 3.5.4, "Refueling Water Storage Tank," is applicable in Modes 1, 2, 3 and 4.

The LCO consists of a minimum contained borated water volume of 453,800 gallons, boron concentration between 2300 and 2500 ppm and a minimum water temperature of 40 degrees Fahrenheit. Amendment No. 192 was issued by Reference 2 to allow the nonseismically qualified piping of the Spent Fuel (SF) purification system to be connected to the RWST under administrative controls. Amendment No. 192 added an asterisk to the OPERABLE requirements and the following notes:

RWST piping may be unisolated from non-safety related piping for ::;; 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> under administrative controls to perform SR 4.5.4.a.2.

RWST piping may be unisolated from non-safety related piping for ::;; 30 days (cumulative) per fuel cycle under administrative controls for filtration.

These alignments cannot be used after RF-22 (Fall 2015).

2.3 Reasons for the Proposed Change The station has implemented a modification that ensures the continued operability of the RWST in the unlikely event of a failure of the non-safety related piping when it is aligned to the RWST. The modification installed a seismically qualified, safety related loop seal from the RWST that supports the inlet to the Spent Fuel (SF) Purification System.

Should a break occur in the non-safety, non-seismic portion of SF Purification System the water level in the RWST will decrease until the siphon effect breaks in the riser loop seal. During post modification testing, this level was verified to be above the current TS minimum tank volume (3.5.4.a). The permanent modification requires no operator interaction during an event and the RWST minimum tank volume is protected by using the upper return line and maintaining the isolation valve for the lower return line locked closed in modes 1 through 4. The flow diagram is shown on FSAR Figure 9.1-3, and a simplified diagram is provided in Attachment 5. The purification system is operated under System Operating Procedure (SOP)-123, "Spent Fuel Cooling System."

2.4 Description of the Proposed Change This LAR is a request to amend the VCSNS TS by removing Amendment No. 192 that was issued by Reference 2. The change will remove the asterisk from LCO 3.5.4 that noted operability of the RWST when connected to unisolated non-safety related piping and the allowable duration under administrative controls. The Bases section is also updated to provide clarification to the alignment of the RWST to the SF Purification System.

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 4 of 7

3.0 TECHNICAL EVALUATION

The proposed change removes a note added by Amendment No. 192 (Reference 2). VCSNS has implemented a modification that renders this note no longer necessary.

4.0 REGULATORY EVALUATION

4.1 Applicable Regulatory Requirements General Design Criteria 2 establishes the requirements that structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions.

Regulatory Guide 1.13 Revision 1, provides the design bases for the Spent Fuel Storage System. Specifically under Regulatory Position 6 and 7 the spent fuel purification lines are mentioned. This describes the lines as being located such that they cannot drain the pool and that the spent fuel purification system will be started by operator action. The station modification added a safety related loop that prevents the draining of the RWST due to a non-safety related pipe break. The modification did not change any operator actions relating to when the spent fuel purification system is started. In addition, administrative controls are in place to use only the RWST upper return line in modes 1 through 4. The modification and administrative controls ensure that the RWST will not drain below the TS minimum level should an event cause failure in the purification piping when aligned to the RWST. Therefore, the modification does not alter the spent fuel storage system nor the RWST in any adverse way.

4.2 Precedent None. This TS change is unique to V.C. Summer Nuclear Station, Unit 1.

4.3 No Significant Hazards Considerati~n

1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?

Response: No. The proposed change removes an administrative note added by Amendment No. 192. The administrative control applied by Amendment No. 192 was issued to prevent or reduce the risk for drainage of the Reactor Water Storage Tank (RWST) when aligned to the non-safety, non-seismic purification system. The station has implemented a modification that qualifies the interconnection of the RWST to the purification system. The installed design prevents the RWST being drained below the current Technical Specifications minimum volume requirement

  • due to a failure in the non-safety purification system. The RWST will continue to

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 5of7 perform its safety function and the overall system performance has not been affected this proposed amendment. Assumptions previously made in evaluating the consequences of the accident are not altered, and the consequences of the accident are not increased. Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

The Purification Loop supports the Spent Fuel System and is not credited for safe shutdown of the plant or accident mitigation. Therefore, the proposed change has insignificant impact on the probability and consequences of an accident previously evaluated. A combination of design and administrative controls ensure that the Purification Loop maintains RWST boron concentration and water volume requirements whenever the contents of the RWST are processed through the system. The RWST is operated under System Operating Procedure for the Spent Fuel Cooling System and is protected by maintaining the isolation valve for the lower return line locked closed in modes 1 through 4.

2. Does the proposed change create the possibility of a new or different kind of accident from any accident previously evaluated?

Response: No. The proposed change does not introduce a new or different accident previously evaluated. The station implemented a qualified design that prevents the RWST from being drained below the current TS 3.5.4.a minimum volume requirement. The proposed change does not alter the design requirements of the RWST or any Structure, System or Component or its function during accident conditions. The changes do not alter assumptions made in the safety analysis and the current TS LCO are maintained. The Purification Loop supports the Sperit Fuel System and is not credited for safe shutdown of the plant or accident mitigation. The proposed change removes a note added by Amendment No. 192 that applied an administrative control to manage the risk of a postulated RWST drainage scenario by the purification system. Therefore, the proposed change does not create the possibility of a new or different kind of accident from any previously evaluated.

3. Does the proposed change involve a significant reduction in a margin of safety?

Response: No. The proposed change removes a note added by Amendment No. 192. The proposed change does not alter the safety limits, limiting safety system settings or limiting conditions for operation of the RWST. The modification preserved the current licensing and design bases of the RWST, therefore the margin of safety for the RWST are not affected. The proposed changes do not adversely affect systems that respond to safely shutdown the plant and to maintain the plant in a safe shutdown condition. The Purification Loop supports the Spent Fuel System and is not credited for safe shutdown of the plant or accident mitigation. Therefore, the proposed change does not involve a significant reduction in a margin of safety.

4.4 Conclusion

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 6 of 7 Based on the above, SCE&G concludes that the proposed amendment presents no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and accordingly, a finding of "no significant hazards consideration" is justified.

5.0 Environmental Consideration This LAR proposes a non-technical change only. SCE&G has evaluated the proposed amendment change and determined the changes do not involve (i) a significant hazards consideration, (ii) a significant change in the types or a significant increase in the amounts of any effluents that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure.

Accordingly, the proposed amendment meets the eligibility criterion for categorical exclusion set forth in 1 OCFR51.22(c)(9). Therefore, pursuant to 1 OCFR51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed amendment.

6.0 REFERENCES

1. Letter from T.D. Gatlin (VCSNS) to Document Control Desk (NRC), "License Amendment Request - LAR 10-03912 Technical Specification Change Request for TS 3.5.4, Refueling Water Storage Tank (RWST)," dated June 29, 2012 (RC-12-0075)

[ML121850005]

2. Letter from Robert E. Martin (NRC) to T.D. Gatlin (SCE&G), "Virgil C. Summer Nuclear Station, Unit No. 1, Issuance of Amendment (TAC No. ME8952)," dated October 12, 2012[ML12270A301]
3. Letter from T.D. Gatlin (VCSNS) to Document Control Desk (NRC), "South Carolina Electric & Gas (SCE&G) Response to Request for Additional Information License Amendment Request - LAR 10-03912 Technical Specification Change Request for TS 3.5.4 Refueling Water Storage Tank (RWST)," dated September 12, 2012 (RC-12-0132)

[ML12258A073]

4. Letter from T.D. Gatlin (VCSNS) to Document Control Desk (NRC), "South Carolina Electric & Gas (SCE&G) Response to Request for Additional Information License Amendment Request - LAR 10-03912 Technical Specification Change Request for TS 3.5.4 Refueling Water Storage Tank (RWST)," dated September 20, 2012 (RC-12-0141)

[ML12268A319]

5, Letter from T.D. Gatlin (VCSNS) to Document Control Desk (NRC), "South Carolina Electric & Gas (SCE&G) Response to Request for Additional Information License Amendment Request - LAR 10-03912 Technical Specification Change Request for TS 3.5.4 Refueling Water Storage Tank (RWST)," dated October 10, 2012 (RC-12-0146)

[ML12286A331]

Document Control Desk Enclosure RC-16-0092 CR-12-02439 Page 7 of 7

6. Letter from George Lippard, SCE&G, "License Amendment Request, LAR-12-02439, Technical Specification Change Request for TS 3.5.4 Refueling Water Storage Tank (RWST)," dated April 28, 2016 (RC-16-0059)
7. Letter from George Lippard, SCE&G, "Withdrawal of License Amendment Request LAR-12-02439, Technical Specification Change Request for TS 3.5.4 Refueling Water Storage Tank (RWST)," dated May 25, 2016 (RC-16-0085)

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 2 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12

.ATTACHMENT 1 PROPOSED CHANGE - MARKED UP TS PAGE Proposed Technical Specification Changes Summary Replace the following pages of the Technical Specifications with the attached revised pages.

The revised pages are identified by amendment number and contain marginal lines indicating the areas of change.

Page 3/4 5-9 3/4 5-9 Remove Page 3/4 5-9 Affected Bar#

Section 3.5.4 1

3.5.4 2

Insert Page 3/4 5-9 DescriQtion of Change Reason for Change Remove asterisk (*)

Expiration of note Remove note Expiration of note

' *.*.*.:. - *-*...... -.~...... _..*.. ;:. ~-* * *

  • .. *,,.: *;1**.
  • 3.5.4 The refueling water storage tank (RWST) shall be OPERABL~with :
a.

A minimum contained borated water volume of 453,800 gallons,

b.

A boron concentration of between 2300 and 2500 ppm of boron, and

c.

A minimum water temperature of 40°F.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With the refueling water storage tank inoperable, restore the tank to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.5.4 The RWST shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

Verifying the contained borated water volume in the tank, and

2.

Verifying the boron concentration of the water.

b.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the RWST temperature when the outside air temperature is less than 40°F.

T iping may be unlsolated from non-safety related piping for s 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> und administr

SUMMER - UNIT 1 314 5-9 Amendment No. 44, ~. 61,492-

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 2 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT 2 PROPOSEDBASESCHANGE-MARKEDUPTSBASESPAGE

EMERGENCY CORE COOLING SYSTEMS BASES REFUELING WATER STORAGE TANK (Continued)

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.5 and 11.0 for the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

Alignment of the RWST to SF Purification has been designed with a safety related stand pipe, or riser oop seal, that is designed with sufficient elevation to maintain a required minimum TS volume per TS 3.5.4 LCO. A bypass line connecting the two legs of the riser loop was provided and contains a ocked closed valve, XVA78094-SF, RWST Loop Seal Bypass Isolation Valve. This valve is locked closed in Modes 1 through 4 by administrative controls. XVT06691-SF, Spent Fuel Cooling Purification Header Throttle Valve is also locked closed in Modes 1 through 4 by administrative controls. The SF Purification Loop returns to the RWST at an elevation higher than the RWST rninimum TS volume.

SUMMER - UNIT 1 B 3/4 5-3 Amendment No. e.t, CorroGtod by lotter dated 10/4/Qa, 49z-

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 2 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT 3 PROPOSED TS PAGE - RETYPED

EMERGENCY CORE COOLING SYSTEMS 3/4.5.4 REFUELING WATER STORAGE TANK LIMITING CONDITION FOR OPERATION 3.5.4 The refueling water storage tank (RWST) shall be OPERABLE with:

a.

A minimum contained borated water volume of 453,800 gallons,

b.

A boron concentration of between 2300 and 2500 ppm of boron, and

c.

A minimum water temperature of 40°F.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With the refueling water storage tank inoperable, restore the tank to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.5.4 The RWST shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

Verifying the contained borated water volume in the tank, and

2.

Verifying the boron concentration of the water.

b.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the RWST temperature when the outside air temperature is less than 40°F.

SUMMER - UNIT 1 3/4 5-9 Amendment No. 44, 56, 61,192

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 2 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT 4 PROPOSED TS BASES PAGE - RETYPED

EMERGENCY CORE COOLING SYSTEMS BASES REFUELING WATER STORAGE TANK (Continued)

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.5 and 11.0 for the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

Alignment of the RWST to SF Purification has been designed with a safety related stand pipe, or riser loop seal, that is designed with sufficient elevation to maintain a required minimum TS volume per TS 3.5.4 LCO. A bypass line connecting the two legs of the riser loop was provided and contains a locked closed valve, XVA78094-SF, RWST Loop Seal Bypass Isolation Valve. This valve is locked closed in Modes 1 through 4 by administrative controls. XVT06691-SF, Spent Fuel Cooling Purification Header Throttle Valve is also locked closed in Modes 1 through 4 by administrative controls. The SF Purification Loop returns to the RWST at an elevation higher than the RWST minimum TS volume.

SUMMER - UNIT 1 B 3/4 5-3 Correoted by letter dated 10/4/93, 192

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 2 VIRGIL C. SUMMER NUCLEAR STATION {VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT 5 SPENT FUEL PIT COOLING PURIFICATION LOOP RWST RISER LOOP SEAL FIGURE

Document Control Desk RC-16-0092 CR-12-02439 Page 2 of 2 Spent Fuel Pit Cooling Purification Loop RWST Riser Loop Seal PLANT VENT t

6695 XPP0014 SPENT FUEL POOL DEMIN XDM-3 t

SPENT FUEL PURIFICATION PUMP 6694 FIRE HOSE CONNECTION BOB 6691 LC 3"

REFUELING WATER t 6" STO~GE TANK RWST 20' RISER LOOP SEAL 6664 To Spent Fuel Pool From Cooling Loop B

Document Control Desk RC-16-0092 CR-12-02439 Page 1 of 1 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT 6 List of Regulatory Commitments There are no regulatory commitments created due to this License Amendment Request.

Any other statements in this submittal are provided for information purposes and are not considered to be regulatory commitments. Please direct questions regarding these commitments to Mr. Bruce L. Thompson at (803) 931-5042.

I Commitment Due Date None N/A

Retrieved from "https://kanterella.com/w/index.php?title=RC-16-0092,_License_Amendment_Request_LAR-12-02439,_Technical_Specification_3.5.4,_Limiting_Condition_for_Operation_Refueling_Water_Storage_Tank&oldid=5165186"