RS-20-046, Emergency License Amendment Request - Increase Technical Specifications Allowable MSIV Leakage Rates in TS 3.6.1.3

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Emergency License Amendment Request - Increase Technical Specifications Allowable MSIV Leakage Rates in TS 3.6.1.3
ML20092P079
Person / Time
Site: Quad Cities Constellation icon.png
Issue date: 04/01/2020
From: Simpson P
Exelon Generation Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-20-046
Download: ML20092P079 (17)
v • d • e


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PCIVs 3.6.1.3 Quad Cities 1 and 2 3.6.1.3-8 Amendment No. 233/229 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.1.3.10 Verify the leakage rate through each MSIV leakage path is 34 scfh when tested at

! 25 psig, and the combined leakage rate for all MSIV leakage paths is 86 scfh when tested at ! 25 psig.

In accordance with the Primary Containment Leakage Rate Testing Program for Unit 1 and 37 scfh for Unit 2*

for Unit 1 and 93 scfh for Unit 2*

  • The Unit 2 values are only applicable during Cycle 26.







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PCIVs 3.6.1.3 Quad Cities 1 and 2 3.6.1.3-8 Amendment No. 233/229 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.1.3.10 Verify the leakage rate through each MSIV leakage path is d 34 scfh for Unit 1 and 37 scfh for Unit 2* when tested at t 25 psig, and the combined leakage rate for all MSIV leakage paths is d 86 scfh for Unit 1 and 93 scfh for Unit 2* when tested at t 25 psig.

  • The Unit 2 values are only applicable during Cycle 26.

In accordance with the Primary Containment Leakage Rate Testing Program







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PCIVs B 3.6.1.3 Quad Cities 1 and 2 B 3.6.1.3-14 Revision 43 BASES SURVEILLANCE SR 3.6.1.3.8 REQUIREMENTS (continued)

This SR requires a demonstration that a representative sample of reactor instrumentation line excess flow check valves (EFCVs) are OPERABLE by verifying that the valves actuate to the isolation position on an actual or simulated instrument line break condition. This test is performed by blowing down the instrument line during an inservice leak or hydrostatic test and verifying a distinctive "click" when the poppet valve seats or a quick reduction in flow. This SR provides assurance that the instrumentation line EFCVs will perform as designed. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.6.1.3.9 The TIP shear isolation valves are actuated by explosive charges. An in place functional test is not possible with this design. The explosive squib is removed and tested to provide assurance that the valves will actuate when required. The replacement charge for the explosive squib shall be from the same manufactured batch as the one fired or from another batch that has been certified by having one of the batch successfully fired. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. Other administrative controls, such as those that limit the shelf life and operating life, as applicable, of the explosive charges must be followed.

SR 3.6.1.3.10 The analyses in References 2 and 3 are based on leakage that is less than the specified leakage rate. In accordance with the Primary Containment Leakage Rate Testing Program, the as-left leakage rate of each main steam isolation valve path is assumed to be the maximum pathway leakage (larger leakage of two valves in series), and the as-found leakage rate of each main steam isolation valve path is assumed to be the minimum pathway leakage (smaller of either the inboard or outboard isolation valves individual leakage rates). The combined leakage rate limit through all MSIV leakage paths must be < 86 scfh when tested at > 25 psig for both as-left and as-found leakage rate tests. Additionally, the leakage rate limit through each MSIV leakage path is < 34 scfh when tested at > 25 psig. These values correspond to a combined leakage rate of 150 scfh and an individual MSIV leakage rate (continued) for Unit 1 and 93 scfh for Unit 2 for Unit 1 and 37 scfh for Unit 2 NOTE:

The Unit 2 values are only applicable during Cycle 26.

PCIVs B 3.6.1.3 Quad Cities 1 and 2 B 3.6.1.3-15 Revision 43 BASES SURVEILLANCE SR 3.6.1.3.10 (continued) of 60 scfh, when tested at 48 psig. This ensures that MSIV leakage is properly accounted for in determining the overall impacts of primary containment leakage. The Frequency is required by the Primary Containment Leakage Rate Testing Program.

MSIV leakage is considered part of La.

REFERENCES 1.

Technical Requirements Manual.

2 UFSAR, Section 15.6.5.

3.

UFSAR, Section 15.6.4.

4.

UFSAR, Chapter 15.

5.

UFSAR, Section 5.2.2.2.3.

6.

UFSAR, Section 6.2.4.1.

at an accident pressure of 48 psig for Unit 1 and 43.9 psig for Unit 2.

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